Removal of hydrogen sulfide from gas by supergravity method
In response to the characteristics of the large volume, low efficiency, large liquid circulation volume, and high operating costs of the desulfurization tower in the wet oxidation desulfurization process, the high gravity rotating packed bed is used as the absorption equipment to form the high gravity wet oxidation technology for removing hydrogen sulfide. The advantages of the high gravity wet process for removing hydrogen sulfide are as follows:
(1) The hydrogen sulfide removal rate is over 95%;
(2) The gas-liquid ratio of desulfurization is greater than 100;
(3) Gas phase pressure drop less than 1000Pa;
(4) The equipment volume is 1/10 of a traditional tower;
(5) The investment and operating costs are 2/3 of the tower desulfurization method;
(6) Transforming hydrogen sulfide into sulfur, turning waste into treasure, without secondary pollution.
This technology has been successfully applied to engineering projects such as desulfurization of furnace gas in Guangxi Huayin Aluminum Industry, desulfurization of sulfur-containing CO ₂ tail gas generated by low-temperature methanol washing desorption process in Tianji Group, desulfurization of coke oven gas in Taiyuan Dongsheng Coking Plant, Hebei Huida Ceramic Group, and ammonia purification of tail gas hydrogen sulfide in the manganese oxide industry in Pingwu Manganese Industry, Sichuan, achieving good results. This technology can be widely applied to the removal of various sulfur-containing tail gases and hydrogen sulfide, such as natural gas, refinery gas, coalbed methane, synthesis gas, coke oven gas, etc; It can be widely applied to pressurized desulfurization systems such as natural gas and shift gas, with broad application prospects.
High gravity wet flue gas deep desulfurization
The flue gas emissions from small and medium-sized coal-fired boilers and kilns are relatively small compared to large power plants, generally ranging from 30000 to 300000 m3/h, with dispersed emissions. The wet limestone/lime gypsum flue gas desulfurization technology used in power plants not only has high investment and operating costs, but also has problems such as equipment scaling and blockage, and single-stage desulfurization is difficult to meet emission standards.
This technology can be coupled with various desulfurization processes such as double alkali method, calcium method, magnesium oxide method, seawater method, alkali method, etc. to improve mass transfer efficiency, enhance SO ₂ absorption, and achieve a single-stage desulfurization rate of over 99%.
This technology has the advantages of high desulfurization rate and purification degree, small liquid to gas ratio, small equipment volume, low investment and operating costs, and wide applicability. Demonstration projects have been established in Yuncheng, Shanxi and Xinxiang, Henan to achieve low-cost and high-efficiency deep desulfurization. The supergravity wet desulfurization technology can achieve integrated flue gas desulfurization, dust removal, and cooling. This technology is suitable for ultra-low emission control of flue gas from small and medium-sized boilers such as industrial kilns, converters, chemical enterprises, and urban heating.
Purification of high concentration NOx by supergravity method
During the nitrification process in the fire industry, high concentrations of nitrogen oxides (commonly known as "nitrate smoke") are emitted, causing serious pollution and making it difficult to control. The traditional atmospheric purification technology adopts multi-stage absorption, but the effect is still not ideal, with emission concentrations as high as about 5000mg/m ³.
North China University has applied supergravity technology to the purification and treatment of high concentration nitrate smoke in the fire industry, and created a water cooling process for supergravity atmospheric pressure purification of high concentration NOx. After adopting this process, with an inlet concentration of 18000mg/m, through two-stage deep purification and supergravity absorption, combined with the reduction decomposition tower process, the nitrate concentration can be reduced to below 240mg/m ³, and the NOx emissions can be reduced by 95%, meeting the emission standards. Compared with existing tower equipment, the cost can be reduced by more than 30%, the investment can be saved by 75%, and the operating costs can be reduced by 79%. This provides a new method for effectively solving the problem of high concentration nitrate pollution and has good industrial application prospects. Demonstration projects have been established in Xing'an, Shanxi and Yinguang, Gansu.
High gravity ammonia blowing denitrification technology
In response to the problems of large equipment and safety hazards in the liquid ammonia gasification process of SCR denitrification system, "super gravity ammonia water blowing" is adopted instead of "liquid ammonia gasification" to eliminate hazards and achieve intrinsic safety.
Applying the enhanced technology of supergravity chemical process to ammonia water blowing and developing supergravity ammonia blowing equipment and technology suitable for denitrification process, blowing free ammonia in ammonia water to the gas phase, and adding it as a nitrogen source to the furnace for denitrification greatly improves the denitrification rate, reduces pollution, and has the characteristics of small equipment volume, low production cost, and high intrinsic safety.
This technology is applied to Shanxi Pingshuo Coal Bangshi Power Generation Co., Ltd., with a single equipment processing ammonia water volume of 0.1-0.8m ³/h, dilution air volume of 1000-2400m ³/h, ammonia water stripping rate of over 95%, NOx emission concentration less than 100mg/Nm ³, and ammonia escape concentration less than 8mg/Nm ³.
High gravity deamination and dehumidification technology
The waste gas containing NH ³ generated during the chemical production process of synthetic ammonia, ammonium carbonate, ammonium nitrate, ammonium sulfate, soda ash, and nitrophosphate has a large volume, high concentration, and contains a large amount of impurities such as water vapor and dust. During the processing, impurities such as dust can form mud like substances during the condensation of water vapor, leading to blockage of tower equipment, low NH ³ recovery rate, and difficulty in stable operation.
By innovating the supergravity device and developing anti blocking special fillers, the integration of deamination and dehumidification has been achieved, with a deamination rate of over 90%, achieving the resource utilization of ammonia and water. The industrial application of the tail gas treatment technology for nitrate phosphate fertilizer in Tianji Group has been achieved through installation and implementation in a narrow space on a 39 meter platform. The waste gas volume is 55000m3/h, the ammonia content is 8.3g/m3, the water vapor volume content is 20.6%, the dust content is 3g/m3, and the temperature is 70 ℃. The original nitrate wastewater in the production process of nitrate phosphate fertilizer is used as the absorption liquid to generate ammonium nitrate solution for reuse in the production process system, achieving efficient deamination and dehumidification with a deamination rate of 92%. The annual recovery of ammonia is 2940 tons, the dehumidification rate is 60.8%, and the annual water recovery is 38600 tons. The economic benefits are 8.82 million yuan per year. This technology is promoted and applied to the deamination and dehumidification project of Shandong Jinzhengda, a large slow-release fertilizer base in Asia.
Purification of VOCs in gases by supergravity method
VOCs containing waste gas is a common chemical waste gas generated in the production processes of petrochemicals, fire, fine chemicals, pharmaceuticals, etc. It has irritant and strong corrosive properties, and is difficult to treat. Based on the physical and chemical properties of VOCs and the principle of similar solubility, a special packing material and device for high gravity have been developed to solve the engineering problems of strong corrosion and dynamic sealing of chemical waste gas, achieving high efficiency absorption and purification rate of over 90%, reducing the load of post-processing.
This technology has been successfully applied to the purification and recovery project of acetic acid containing waste gas in the production process of a certain enterprise. Water is used as the absorbent, and stainless steel porous corrugated plate modified hydrophilic packing is used. The gas flow rate is 4500m3/h. When the acetic acid concentration in the absorption liquid reaches 70%, it is transferred to the distillation section. After distillation, the acetic acid concentration reaches over 99%, and 527 tons of acetic acid are recovered annually. This technology can be widely applied in the recovery process of mixed solvents such as acetic acid, acetone, and ethyl acetate.
Coal chemical process compressor inlet gas dust removal and tar removal
In the production process of modern coal chemical industry, the compressor is often required to pressurize after the purification of coal gas. A small amount of tar, dust and other impurities in the gas are easy to block the compressor valve, affecting normal production.
The technology of high gravity dust removal and tar removal has the following characteristics:
(1) Realize high-precision purification, and the concentration of tar and dust can be reduced to below 5mg/m ³;
(2) The liquid usage is small, and the gas-liquid ratio during operation can reach around 2000;
(3) The gas phase pressure drop is small, below 800Pa;
(4) Gas making circulating water can be used as a washing solution, which is convenient and reliable.
This technology is applied to the 200000 ton/year synthetic ammonia compressor inlet semi water gas dust removal technology renovation project of Guizhou Kailin Xifeng Synthetic Ammonia Phase I. Under the working condition of an inlet dust content of about 60mg/m ³, the dust removal rate can reach over 90%, and the purification footprint content is less than 5mg/m ³, ensuring the long-term stable operation of the compressor.
This technology can be widely applied to the deep purification process of compressor inlet gas in projects such as ammonia synthesis, coke oven gas to methanol production, and coal to hydrogen production.
High gravity coal gas lock purification technology
Coal lock gas "refers to the gas containing dust and tar released by the coal lock during the coal pressure gasification process. Under normal pressure, it needs to be pressurized by a compressor before entering subsequent processes. The tar dust content in the gas from the gas cabinet of Xinjiang Guanghui New Energy Co., Ltd. exceeds 1000mg/m ³, causing the compressor to be blocked and unable to operate normally. Coal lock gas can only be used to light sky lanterns, resulting in environmental pollution and resource waste.
The high gravity wet dust removal technology uses gasification circulating water as the purification medium, with a liquid consumption of only 8m ³/h. The tar dust content in coal lock gas is about 500-1000mg/m ³. After being purified by supergravity wet method, the tar dust content in the gas is around 20-80mg/m ³, and the purification rate can reach over 90%. The annual recovery of gas is 230 million m ³. The working cycle of the compressor has been increased from 5 days to over 6 months, and the purification effect is good. Solved the industry problem of environmental pollution and resource waste caused by the combustion emissions of coal lock gas torches.
The promotion and application of this technology in the Xinjiang Xintian Coal Chemical Coal to Natural Gas Project has good prospects for industrial application.
Wind blown air supergravity dust removal technology in the fertilizer industry
With the intensification of haze weather, the emission standards for air pollutants have been adjusted multiple times. A ultra-low emission standard of less than 5mg/m ³ or a special emission limit of 20mg/m ³ has been proposed for the dust content in exhaust emissions. The commonly used bag filter, electrostatic precipitator, and wet electrostatic precipitator technologies have the problem of decreased efficiency in purifying low concentration dusty gases and ultrafine particles. The supergravity dust removal technology uses water to wash and purify fine particles such as dust in the gas, achieving ultra-low emissions. It still has a purification effect of over 90% for PM1.0 and is suitable for use in series with the original wet dust collector.
This technology has been successfully applied to the blowing air dust removal of Henan Xinlianxin Fertilizer Co., Ltd. After the recovered blowing air undergoes combustion, heat exchange, and water film dust removal processes, the dust content of the flue gas is about 100mg/m ³, which cannot meet the environmental emission requirements. A demonstration project with a processing capacity of 80000m ³/h has been established, and the diameter of the supergravity equipment is 2200mm; Using gasification circulating water as the purification medium, with a circulating water volume of 26m ³/h; The export dust content is less than 12mg/m ³; The gas phase pressure drop is only 800Pa, which economically and effectively achieves ultra-low emissions of chemical blowing air.
High gravity purification of ammonium calcium rich exhaust gas
This technology is applied to the purification and recovery products of Tianji Group's rich ammonium calcium tail gas. During the production process, the rotary drum fluidized bed granulation process is adopted, and the exhaust gas contains 3000mg/m ³ of ammonium calcium nitrate product with a gas volume of 43000Nm ³/h. The direct discharge of exhaust gas causes the loss of some products and also pollutes the environment. However, due to the large exhaust gas volume and fine dust particles, the conventional dust removal method has poor dust removal effect, and the dust removal equipment is prone to blockage, making it unable to operate normally for a long time; At the same time, the rich ammonium calcium production plant is located on a 22 meter high platform with limited spatial space (the height inside the factory is only 5 meters), and traditional dust removal equipment is limited by dust removal efficiency and spatial layout issues.
Adopting this technology to purify ammonium calcium rich exhaust gas, the super gravity dust removal device has a diameter of 1.6 meters and a height of 3.5 meters, installed indoors in the production site, meeting the needs of factory layout. The long-term operation results show that the super gravity dust removal device has good dust removal effect, with a dust content of only 5mg/m ³ in the outlet gas and a dust removal efficiency of over 99%, meeting environmental protection requirements. The circulating water volume is only 12t/h, and the vacuum cleaned liquid can enter the production process and recover the product.
High gravity electrochemical wastewater treatment technology
In response to the technical challenges of failing to meet discharge standards for organic matter and COD in wastewater, as well as low wastewater treatment efficiency, a multi-stage concentric cylindrical electrochemical device with high gravity and a high gravity electrochemical wastewater treatment technology have been developed. This device has the advantages of large electrode specific surface area, high mass transfer and degradation efficiency, and easy automation control and management. This technology does not require oxidation reagents and can solve the technical problems of high organic content, poor biodegradability, and limited mass transfer in wastewater treatment, resulting in increased energy consumption and decreased treatment efficiency.
Compared to traditional electrochemical wastewater treatment technologies, the advantages of supergravity electrochemical wastewater treatment technology are:
(1) The organic matter removal rate reaches 80% -;
(2) Reduce wastewater treatment time by more than 30%;
(3) Improve processing efficiency by over 20%;
(4) Reduce process energy consumption by 10% -20%;
(5) Improve the biodegradability of wastewater, eliminate secondary pollution, maintain clean technology, and promote environmental protection.
Photocatalytic degradation of organic wastewater using a rotating disk reactor
Semiconductor photocatalytic technology has the advantages of mild reaction conditions, green efficiency, and no secondary pollution. However, due to the difficulty in separating suspended catalysts, limited mass transfer between catalysts and pollutants caused by strong hydrophilicity, and low photon transfer efficiency in photoreactors, photocatalytic technology is difficult to industrialize and apply.
Technical features and advantages:
(1) Loading or magnetic modification of catalysts to solve the separation problem of catalysts;
(2) By modifying organic compounds to enhance the lipophilicity of catalysts, the limitation of mass transfer between catalysts and pollutants can be solved;
(3) The material exists in the form of a thin film flow, with fast mass transfer rate, high light utilization efficiency, and fast surface renewal. The renewal rate is twice that of a circular reactor; The large illuminated surface area per unit volume improves the efficiency of photon transmission; The dissolved oxygen in the liquid film is increased, resulting in high catalytic efficiency.
Application effect:
(1) UV light degradation of phenol containing wastewater: 1L initial concentration of 100mg/L phenol containing wastewater, circulating for 30 minutes, wastewater degradation rate; Cycle for 120 minutes, with a mineralization rate of over 90%;
(2) Combined with Pickering lotion, it can degrade high concentration nitrobenzene wastewater, with a degradation rate of more than 98%.
Treatment of Fire Wastewater by High Gravity Oxidation Method
Fire wastewater has the characteristics of large discharge volume, high pollutant concentration, complex composition, high chromaticity, and difficult biodegradation. Existing technologies are difficult to achieve low-cost and high-efficiency treatment. The technology of using supergravity oxidation to treat fire wastewater can meet the discharge standards and has good industrial application prospects. This technology is supported by the Natural Science Foundation of China (U1610106) and the Fire Youth Science and Technology Research Fund (HZY06020301-11).
The technological advantage lies in:
(1) Innovate the coupling mechanism of supergravity ozone oxidation and ultrasonic enhanced oxidation to form a new technology for the treatment of recalcitrant wastewater;
(2) High gravity technology enhances gas-liquid mass transfer, improves ozone utilization efficiency, and reduces treatment costs;
(3) Ultrasonic technology generates hydroxyl radicals, which enhance the ozone oxidation ability and improve efficiency;
(4) The removal rate of nitro compounds is ≥ 96%, The COD removal rate is ≥ 93%, and the biochemical coefficient can reach 0.3 or above, meeting the requirements of subsequent biochemical processes.
This achievement can be widely applied to the degradation process of organic wastewater such as DNT, RDX, HMX in industries such as fire and chemical.
Supergravity enhanced iron carbon microelectrolysis catalyzed ozone degradation of nitrobenzene wastewater
Improving treatment efficiency, reducing treatment costs, and shortening treatment time are key factors in the degradation of organic wastewater by oxidation method. Based on this, the idea of using supergravity enhanced microelectrolysis to catalyze ozone degradation of nitrobenzene wastewater is proposed. Using nitrobenzene as the object, a low-cost iron carbon battery is formed. The cathode activity [H] reduces - N0 ₂ on the benzene ring to easily degradable - NH ₂, and the anode Fe is oxidized to Fe ²+, Fe ²+catalyzes the production of OH with stronger oxidation ability, utilizing supergravity to increase the degree of liquid phase turbulence and gas-liquid contact area, promote the dissolution of O3, solve the key problem of limited mass transfer of O3, improve the utilization rate of O3, enhance degradation efficiency, meet the requirements of biodegradability, and achieve the goal of "treating waste with waste".
This project has received funding from the Natural Science Foundation of China, obtained 6 invention patents, and published 12 papers in important academic journals such as Chemical Engineering Journal. The completion of the project provides new ideas for the deep treatment of difficult to degrade wastewater, and has important scientific significance and application value for expanding the field of supergravity technology and promoting the development of new technologies
High gravity deep treatment of refractory organic wastewater
Ozone oxidation technology has the advantages of fast reaction rate, high treatment efficiency, and no secondary pollution, but it has disadvantages such as poor water solubility and low utilization rate of ozone. Based on this, utilizing supergravity to enhance fluid turbulence and gas-liquid contact area, promote O3 dissolution, and solve the problem of limited O3 mass transfer; By coupling Fe ²+, H ₂ O ₂, ultrasound and other technologies, low-cost and high-efficiency degradation of aromatic nitro organic wastewater can be achieved. This study was funded by the Shanxi Provincial Youth Fund and other sources.
Research has shown that supergravity technology can improve the utilization efficiency of ozone, with a removal rate of over 96% for nitro compounds and a biochemical coefficient of over 0.3. Applied for 12 invention patents and published 24 academic papers in journals such as Journal of Nanoparticle Research.
High gravity brine bromine extraction technology
In response to the current situation of low bromine content in brine resources in China, and considering factors such as the maturity of production techniques and costs, the air blown acid absorption method is commonly used for bromine production in China. At present, this process consumes a large amount of liquid chlorine, consumes high electricity, and has a low yield of bromine, which directly leads to the waste of energy and resources.
The innovation of this technology lies in:
(1) Propose a method for extracting bromine from high gravity brine and form a complete set of process technology;
(2) Improved the oxidation rate of bromide ions, increased the utilization rate of chlorine gas, reduced the chlorine blending rate, and decreased the consumption of chlorine gas;
(3) The increase in the oxidation rate of bromide ions reduces the corrosiveness of equipment in the bromine extraction and salt drying processes;
(4) Improved bromine extraction rate, reduced air usage, and lowered operating costs by 31%;
(5) The equipment volume is only 1/28 of traditional tower equipment;
(6) Obtained 1 invention patent: ZL 200910073665.4
High gravity blowing technology for removing ammonia nitrogen wastewater
Ammonia nitrogen wastewater comes from multiple industries such as fertilizers, coking, and oil refining. Ammonia nitrogen pollution causes eutrophication of water bodies, disrupts ecological balance, and poses great harm. The treatment of ammonia nitrogen wastewater is difficult and has been included as a technical requirement for strategic development. For the treatment of high concentration ammonia nitrogen wastewater, the method of air blowing and biochemical treatment is often used. The blowing equipment is mostly packed towers, with large gas consumption and low blowing efficiency.
The innovation of this technology lies in:
(1) Based on years of research, a complete set of technology for ammonia nitrogen removal by supergravity method has been developed;
(2) The gas consumption is about 1/4 of the traditional method, reducing energy consumption by 38%;
(3) The one-way blow off rate can reach over 85%, approaching the theoretical equilibrium state of gas-liquid;
(4) In 2001, won the second prize for scientific and technological progress in Shanxi Province;
(5) In 2002, it was listed as a key promotion project by the Ministry of Science and Technology
Preparation of nano zero valent iron by supergravity and simultaneous treatment of nitrobenzene containing wastewater
Aiming at the problems of easy aggregation and deactivation in the preparation, drying, and storage of nano zero valent iron, the idea of preparing nano zero valent iron by supergravity and synchronously treating nitrobenzene containing wastewater is proposed. Coupling the preparation of nano zero valent iron with the reduction of nitrobenzene by nano zero valent iron, and synchronously achieving rapid treatment of nitrobenzene containing wastewater in the preparation of nano zero valent iron.
The research results indicate that the appropriate initial concentration of iron ions added during the treatment process is about the concentration of nitrobenzene in the nitrobenzene wastewater
The concentration range of sodium borohydride reducing agent solution is 2.0-3.0 times the initial concentration of iron ions, and the retention time is only 3 seconds. The removal rate of nitrobenzene can be achieved.
This method reduces multiple steps to one step, avoiding the complex operations such as washing, separation, drying, and storage in the traditional method of preparing nano zero valent iron, greatly simplifying the preparation and use steps, and providing a simple and fast new approach for the treatment of nitrobenzene containing wastewater.
Preparation of Nano Magnesium Hydroxide Flame Retardant by High Gravity Technology and Its Application Research
In response to the problems of uneven particle size distribution, poor quality stability, and difficult settling and separation of magnesium hydroxide slurry in the traditional stirred tank reactor during the preparation of nano magnesium hydroxide, this technology proposes to enhance micro mixing by using an impact flow rotating packed bed reactor and introducing surfactants for online modification during the preparation process, achieving one-step preparation and modification of nano magnesium hydroxide and opening up a new process for continuous preparation of nano magnesium hydroxide.
Technological innovation lies in:
(1) The settling performance of the magnesium hydroxide slurry obtained by this technology is significantly improved, and its settling speed is 4.7 times that of the forward precipitation method,
It is 12.4 times that of the reverse precipitation method and 2.1 times that of the bidirectional precipitation method;
(2) The magnesium hydroxide prepared by this technology is hexagonal sheet shaped, with small particle size, uniform particle size distribution, good dispersibility, high purity, and complete crystal shape. It has good thermal stability and meets the requirements of flame retardants;
(3) This technology combines the advantages of high gravity precipitation method for preparing nano magnesium hydroxide and online modification method to synthesize the surface in one step
Organic magnesium hydroxide;
(4) Obtained 2 invention patents: ZL 201310338819.4、ZL 201210561949.X
Preparation of magnetic nanomaterials using supergravity process enhancement technology
The traditional preparation methods of magnetic nanomaterials have problems such as difficulty in continuous production, low preparation efficiency, and uneven particle size distribution and easy agglomeration, which seriously restrict the application and expansion of magnetic nanomaterials. The impact flow rotating packed bed (IS-RPB) utilizes the enormous shear force formed by high-speed impact jets under strong centrifugal force to greatly enhance the micro mixing and mass transfer process of liquids, resulting in a much shorter characteristic time for micro mixing than the nucleation induction period of nanoparticles. The reaction system has high supersaturation and uniform distribution, and the magnetic nanoparticles prepared from this have small particle size and uniform distribution. Continuous preparation of superparamagnetic MFe ₂ O4 (M=Fe, Mn, Co, Ni) nanoparticles, metal elemental and alloy magnetic nanoparticles, natural high molecular weight based magnetic nanoparticles, and mesoporous magnetic nanoparticles has been successfully achieved.
This study has applied for 3 invention patents and published 8 academic papers in SCI journals such as Journal of Alloys and Compounds. This technology has a simple process and can be continuously produced. The prepared magnetic nanomaterials have significant detection and removal effects on heavy metal ions, which can provide new ideas for efficient treatment of heavy metals and have guiding and reference significance for expanding the application of supergravity technology.
Construction and application of micro impact flow supergravity reactor
Based on the multi-scale effects of mixed processes, a micro impact flow/supergravity (MIS RPB) reactor is constructed to address the structural, mixing scale, and processing capacity mismatch issues that exist when coupled with supergravity. This is done by taking into account the characteristics of confined impact flow and combining the advantages of supergravity machines (or rotating packed beds). The main focus is on studying the mixing mechanism of micro impact flow at the meso micro scale, conducting structural optimization and parallel amplification research, and achieving high integration of micro impact flow and rotating packed bed. Research has shown that the micro mixing effect of MIS RPB is significantly better than that of IS RPB (collisional flow rotating packed bed).
The synthesis of Mn/Co based oxides is a hot research topic in energy storage materials, and their properties are easily affected by micro mixing and precipitation processes. Therefore, the MIS-RPB reactor is used instead of conventional reactors to investigate the strengthening and regulation mechanism of crystal nucleation and growth during the reaction precipitation process by the supergravity field, further improving the electrochemical performance of the material and providing new technologies for the development of energy storage materials, ultimately forming a complete system of "reactor construction structure optimization application evaluation". Research has shown that the cycling stability of Mn/Co oxides prepared by micro impact flow is significantly improved (with a 4% decay after 1000 cycles).
Simulation of Hypergravity Multiphase Flow
High gravity multiphase flow simulation focuses on the fluid flow and reaction characteristics in high gravity chemical processes, utilizing the advantages of collaborative multiple simulation methods to simulate and design high gravity reactors, and achieve process optimization.
Introducing the correlation equations of liquid holding capacity and mass transfer coefficient unique to supergravity in Aspen, the influence of operating conditions on theoretical tray height in vacuum distillation and extraction distillation was predicted, providing a theoretical basis for further amplification; The neural network model (ANN) can simulate experimental results with high accuracy and speed, predict large adsorption capacity in the adsorption process and classification efficiency in the dust removal process. Compared with traditional empirical correlation equations, it has a wider range of applicability and a correlation coefficient of over 0.99; CFD shows the flow field characteristics in hypergravity, such as the distribution of liquid in a cross flow rotating packed bed, changes in liquid film thickness, pressure drop, and residence time distribution.
Visualization Study of Hypergravity Multiphase Flow
Due to the complex structure of the supergravity rotating packed bed, the internal fluid flow pattern and droplet fragmentation mechanism are still unclear. Based on the Particle Image Velocimetry (PIV) technology, a complete and feasible visualization research method was established to study the flow characteristics such as fluid flow morphology, droplet size, and droplet velocity distribution inside the hypergravity rotating packed bed, impact flow rotating packed bed, and rotating disk reactor.
The PIV technology was used to study the fluid flow characteristics of the flow field in the impact flow rotating packed bed, including droplet distribution, droplet fragmentation mode, velocity distribution, and turbulence kinetic energy distribution. The results showed that the diameter of the impact surface in the impact flow rotating packed bed was linearly related to the initial velocity of the impact. At the impact center, the turbulence kinetic energy was higher and the mixing degree was higher, while at the edge, the turbulence kinetic energy was smaller
Present a random distribution; After impact, no reflux is formed and it has the characteristics of a laminar flow reactor. By visualizing the impact flow rotating packed bed, theoretical and guidance are provided for the structural optimization of IS-RPB.
Polyacrylamide dissolution and maturation technology for high gravity enhanced tertiary oil recovery
The tertiary oil recovery technology mainly based on polymer flooding has been widely adopted. The conventional polymer configuration station adopts a short process configuration technology of "dispersion dissolution (maturation) export". The core issues that restrict the configuration capability are the maturation time and the number of maturation tanks. The maturation process adopts a platform high shelf maturation tank stirring maturation process, and the dissolution process requires a long time, resulting in a large equipment volume, large quantity, large footprint, high investment and energy consumption, and long construction period of the entire configuration station.
Technical features and advantages: In a supergravity field, polymer suspension passes through the microchannels of rotating fillers, which are high-frequency extruded by the rotating fillers and cut into liquid filaments and mist shapes, rapidly reducing the forces between polymer macromolecular segments. The diffusion speed of solvent small molecules penetrating into macromolecular segments is instantly accelerated, improving the dissolution rate and shortening the dissolution time.
Application effect: (1) The device has a small size, is easy to pry and install, and has a dispersed layout; (2) Short dissolution time, shortened from 2.5-3.0 hours in traditional methods to 10 minutes; (3) Low equipment quantity, low investment, and short construction period; (4) Continuous production, high efficiency, beneficial
Promote application; (5) The concentration of polymer mother liquor is uniform and the quality is stable.
Preparation of methanol diesel emulsion fuel using supergravity technology
The use of an impact flow rotating packed bed as an emulsifying device to prepare methanol diesel emulsion fuel is an attempt of supergravity technology in the preparation process of methanol diesel emulsion fuel, and a combination of traditional technology and high-tech. The significant feature of this technology is that the oil-water two-phase is rapidly sheared and strongly dispersed in the impact flow rotating packed bed device, and the prepared emulsified diesel has the characteristics of long stability time, low emulsifier dosage, and uniform particle size distribution. More importantly, the preparation of emulsified diesel is a continuous operation, achieving "do it now".
This study innovates the IS-RPB preparation technology for methanol diesel emulsification, which can add a small amount of emulsifier and co emulsifier according to the actual stability time requirements to reduce the emulsification cost. It has developed a new process for continuous preparation of emulsified diesel and achieved efficient and continuous operation. It can be widely applied in fields such as emulsified paraffin, emulsified coatings, and emulsified silicone oil. This study was supported by the Natural Science Foundation of China, with 5 authorized invention patents and 1 monograph. 28 academic papers were published in journals such as Renewable Energy, including 1 highly cited ESI paper.
Supergravity distillation technology
The traditional distillation process is limited by the gravity field, with a small gas-liquid interface area, slow surface renewal rate, low mass and heat transfer coefficients, and large volume and high energy consumption of distillation equipment.
The supergravity distillation technology increases the gas-liquid interface area by an order of magnitude, updates the phase interface quickly, greatly improves the mass and heat transfer coefficients, and reduces the mass transfer element height by 1-2 orders of magnitude compared to traditional distillation columns. The gas phase pressure drop is 1/3-1/2 of that of traditional distillation columns, greatly reducing investment costs and energy consumption.
This technology has developed a high gravity distillation equipment and process with a processing capacity of 4-6t/h, which can be used for the separation of methanol/water, ethanol/water, benzene/toluene, etc. The operating temperature is 0-150 ° C, and the operating pressure is 0.095MPa-0.5MPa.. It can be used alone or in combination with existing towers.
High gravity aging Baijiu technology
Newly distilled liquor is generally spicy, strong, and has a strong stimulating taste. It needs to be stored for a certain period of time to eliminate any impurities. The natural aging of traditional Baijiu has many disadvantages, such as long aging time, large liquor body loss, large floor area, and serious capital backlog.
The innovation of this technology lies in:
♦ Create internal circulation type high gravity equipment and technology for aging Baijiu, and obtain an invention patent (ZL200910075686. X);
♦ The self circulation flow of liquor in the overweight machine is realized, which avoids liquor body loss and ensures the basic quality of Baijiu;
♦ The micro scale contact between Baijiu and oxygen containing gas in the rotating packing strengthens the molecular association and oxidation during the aging process of Baijiu, and effectively controls the removal of small molecules of volatile matter;
Professional wine tasters' evaluation: the fresh Baijiu can be treated by high gravity for 1 hour, which can achieve the natural aging effect of 1-2 years of aging. The liquor is mellow and soft.
High gravity liquid-liquid extraction technology
In the liquid-liquid extraction process, the density difference between the two liquid phases is small, while the viscosity and interfacial tension are high. The mixing and separation of the two phases is much more difficult than in gas-liquid mass transfer processes (such as absorption, distillation, etc.). To achieve ideal extraction results, extraction equipment needs to have good mixing and extraction mass transfer performance.
This technology has developed a new, fast, and efficient supergravity extraction equipment - the Impact Flow Rotating Packing Bed (is RPB), which utilizes its fast mixing characteristics to enhance the mass transfer process of two-phase liquid mixing, achieving a single-stage extraction efficiency of over 99%.
This technology is applied in the treatment of phenol containing wastewater, concentration of dilute acetic acid solution, extraction of copper ore leaching solution, and other fields. The extraction stage has high efficiency, wide relative range, short residence time, no solvent retention, strong adaptability, large equipment processing capacity per unit volume, low energy consumption, and is easy to industrialize and scale up.
This technology won the first prize for scientific and technological progress in Shanxi Province's universities in 2006.
