A lime gypsum desulfurization system
The lime gypsum desulfurization method is currently the main direction of desulfurization process development. The characteristic that lime gypsum desulfurization does not affect boiler output has made it the most widely used method in current desulfurization processes. It is currently the most mature and stable desulfurization process in the world. The treatment of desulfurization by-product gypsum generally includes two methods: disposal and recycling, which mainly depend on factors such as market demand for desulfurization gypsum, gypsum quality, and whether there is sufficient storage space. The lime gypsum desulfurization method uses lime as a desulfurizer. The desulfurizer preparation system removes the silicon iron component in the lime. The quicklime in the lime becomes mature lime when it meets water (water and calcium oxide react to form calcium hydroxide), which reacts with SO2 in the flue gas to generate calcium sulfite. After forced oxidation, gypsum is produced.
Desulfurization: The lime gypsum desulfurization slurry is drained to the stainless steel 316L volute high-efficiency nozzle inside the tower through a circulating pump. Make the desulfurization slurry form spray and fully react with the flue gas to achieve the purpose of efficient desulfurization, which can not only ensure full absorption, but also not worry about scaling and blocking in the tower, and the system resistance is small, which is conducive to the energy saving of the induced draft fan, so it is widely used.
2. Detailed Explanation of the Technical Process Description Scheme of the Invention
Composition of desulfurization system
The entire desulfurization system of lime/gypsum method mainly consists of seven parts: desulfurizer preparation system, sulfur dioxide absorption system, by-product treatment system, process water system, accident discharge system, and automatic control high-efficiency dust removal system.
(1) Desulfurizer preparation system
Purchase lime and transport it directly to the desulfurization site for storage in the lime silo. The pulping method is as follows: the lime in the silo is fed into the lime slurry tank through a rotary feeder to make slurry. Determine whether new slurry needs to be added based on the change in pH value of the circulating slurry in the desulfurization tower. The amount of lime slurry required for the desulfurization system is jointly controlled based on the boiler load, SO2 concentration in the flue gas, and Ca/S. The water source for the desulfurizer preparation system comes from the process water tank set up in the system. The outlet main pipe of the lime slurry pump is equipped with a reflux pipe, which is equipped with an electric valve. After the pH value in the desulfurization tower decreases, the range is set to (pH value between 5.5-6.5, weakly acidic operation mode) to provide feedback on the signal for adding materials. The reflux valve is closed, and the slurry addition control is carried out through the pH meter signal of the desulfurization tower. The system is equipped with two lime slurry pumps, one in use and one as backup. There are flow meters on the outlet main pipeline that can monitor the flow rate in real time. The lime slurry pump meets the maximum feeding capacity required for the desulfurization tower.
A dust collector is installed at the top of the silo to prevent dust during feeding. The silo controls the height of the material inside the silo based on the level gauge.
(2) Sulfur dioxide absorption system
The flue gas enters the absorption zone of the absorption tower through the inlet flue, and in the upward process, it comes into contact with the lime slurry in reverse flow. The lime slurry reacts with the pollutant gas contained in the flue gas, namely SO2, and the vast majority of SO2 is absorbed and dissolved into the slurry, generating calcium sulfite and calcium bisulfite, achieving the goal of removing SO2 from the flue gas.
The upper part of the desulfurization tower mainly includes four spray layers and one flue gas redistribution device, two levels of demister, demister flushing, and corresponding support parts. External accessories include pH meters, level gauges, and corresponding pipelines. The absorption and circulation subsystem of the desulfurization system is composed of the desulfurization tower, its internal components, and external accessories. The desulfurization tower is strictly prohibited from being used as a chimney to directly pass through hot flue gas.
The lower part of the absorption tower is a slurry pool with a height of 7 meters. The start and stop of equipment such as the circulation pump, mixer (see Figure 1), and gypsum discharge pump are controlled by the liquid level. The agitator is arranged diagonally upward and radially in the lower slurry pool of the absorption tower, with the function of maintaining the flow state of the slurry, so as to keep the desulfurization effective substances uniformly suspended in the slurry, ensuring the absorption and reaction ability of the slurry for SO2.
The material of the absorption tower body is carbon steel lined with glass flakes for corrosion prevention. Anti corrosion measures shall be taken at a distance of 2 meters from the flue gas inlet of the absorption tower for treatment.
Blender Details
The upward flow velocity of flue gas in the absorption tower is controlled within 3m/s. There are 4 spray layers inside the tower, each consisting of a main pipe with connecting branch pipes and nozzles. The layout design of spray components and nozzles uniformly covers the cross-section of the upstream area of the absorption tower. The sprinkler system adopts a combination design, with one circulating pump connected to each of the four sprinkler layers. The number of slurry circulation pumps in operation is determined based on the changes in boiler load and the requirements for absorbing slurry flow rate. On the premise of meeting the absorption efficiency requirements, an economical pump operation mode can be selected to save energy consumption.
1、 Dust removal in desulfurization tower: The flue gas after desulfurization is treated by a ridge defogger to reduce the moisture carried in the flue gas. After being treated by two layers of defoggers, the moisture carried in the flue gas is not more than 75mg/Nm3. The defogger adopts the traditional top mounted arrangement at the top of the absorption tower. The defogger is made of PP material with good anti-corrosion performance to prevent corrosion by smoke and slurry. The type is ridge type. The defogger is regularly rinsed with clean water to prevent blockage and reduce the defogging effect. Background technology:
At present, the environmental protection situation is severe, requiring boiler flue gas data to meet emission standards. After passing through the electric bag filter, the amount of smoke and dust in the boiler flue gas still does not meet the emission standards. Therefore, it is necessary to desulfurize and reduce dust in the desulfurization tower. A regulating bed device is installed in the tower, which integrates deep desulfurization, dust removal, and defogging functions. It has the characteristics of single tower, low energy consumption, strong adaptability, short construction period, no additional site increase, and simple operation. It is suitable for deep purification of SO2 and smoke in coal-fired flue gas. The pollutant emission concentration of wet flue gas desulfurization treated by this technology can reach SO2<35 mg/Nm3 and smoke<5 mg/Nm3.
The existing desulfurization tower rotary ball dust removal device adopts a regulated flow packed bed regulated flow phase change device, which uses a combination structure of multiple layers of annular guide channels and multiple layers of rotary ball baskets. However, during the operation of this rotary ball dust removal device, due to the pushing of flue gas, the rotary balls in the ring channels can be blown out, which affects the desulfurization tower rotary ball dust removal effect. According to the requirements of desulfurization rotary ball dust removal, a grid cover needs to be installed on the matching packing basket to press and restrict the packing balls in each ring channel. However, the current operating rotary ball basket is a cylindrical and hexagonal structure, fully laid in the circular desulfurization tower, and there are leakage holes at the boundary. After filling the gaps with joint filling agent, a grid cover is also needed. The current rotary ball dust removal device is prone to ball running and filling gaps during operation. There are hidden dangers such as adhesive cracking and damage to the combination structure of the spinning ball basket, which require shutdown and maintenance to restore normal processing effects. Due to the occurrence of ball running and malfunctions in the existing spinning ball dust removal device, it is necessary to remove the damaged top grille plate of the spinning ball basket and remove the edge sealant of the spinning ball basket for maintenance, which is time-consuming and labor-intensive; In addition, the layout of the spinning ball basket in the existing spinning ball dust removal device is unreasonable, which can easily block the flue gas channel. Design a set of rotary ball dust removal device based on the operation process to solve the above problems,
Made of a single piece of metal material, the bed surface is a circular shape that is closely attached to the desulfurization tower wall. The upper and lower surfaces are welded with 316L stainless steel bars, and the spacing between the stainless steel bars on the upper and lower passing surfaces is determined according to the size of the rotating ball. Stainless steel plates are used to connect the four sides. The bed surface of the overall rotating ball dust removal device is divided into three parts for spacing. The spinning balls are evenly distributed in three parts, and a door is set on the top bed surface for spinning ball filling and replenishment. The packing ball layout in the rotary ball dust removal device of the desulfurization tower is reasonable, the rotary ball has good fluidity, the smoke and dust treatment effect is faster, and it is not easy to block the flue gas channel. Thus overcoming the maintenance difficulties and easy blockage of smoke in existing technologies, the overall structure is scientific and reasonable, the manufacturing process is simple, the installation and operation are convenient, and the production cost is low.
Original rotary ball dust collector device
After the design and production are completed
2、 Main structure of rotary ball dust removal device for desulfurization tower
Spinning device body, 1st level spinning area, 2nd level spinning area, 3rd level spinning area, spinning ball, stainless steel isolation plate.
1. Rotating ball device body: The top and bottom covers are welded with 8mm 316L stainless steel reinforcement, measuring 4cm x 15cm to 4cm x 25cm. The top cover is a movable door fixed with a locking device, and the outer stainless steel plate is welded. The upper part is equipped with a 52cm stainless steel isolation plate, and the outer protective plate is 40cm high and 3mm thick. It is welded with 316L stainless steel plate.
2. Level 1 spinning ball area: 8cm 316L stainless steel reinforcement is used according to the diameter inside the tower, which is divided into three parts, and the part close to the inner circle is the Level 1 spinning ball area.
3. Level 2 spinning ball area: 8cm 316L stainless steel reinforcement is used according to the diameter inside the tower, which is divided into three parts. The two parts close to the inner circle are the Level 2 spinning ball area.
4. Level 3 spinning ball area: 8cm 316L stainless steel reinforcement is used according to the diameter inside the tower, which is divided into three parts. The third part close to the inner circle is the Level 3 spinning ball area
5. Spinning ball: The spinning ball is made of polypropylene solid ball processed from isotactic polypropylene. The diameter is 5.5 cm, the structure is regular, and it has excellent mechanical properties. Its strength and hardness are high, and its outstanding performance is its resistance to bending fatigue. The product has good heat resistance. After dust removal and spraying, the flue gas enters through the gaps between the guide systems, and the direction of the airflow changes, forming a circumferential airflow field that drives the spinning ball to revolve around the center and rotate on its own. The inertia capture and interception of absorbing liquid droplets in flue gas by the spinning ball, as well as the condensation of its vapor on the surface of the spinning ball to form a liquid film, create turbulent flow between the packing balls due to the motion of the spinning ball, allowing the gas, liquid, and solid phases to fully contact, greatly reducing the mass transfer resistance of the gas-liquid film and greatly improving the mass transfer rate Reduce the dust content in flue gas. The spinning balls are distributed within the zones of the three-stage spinning ball dust removal device, with an overall ball loading capacity of not less than 96%.
6. Stainless steel partition: The stainless steel partition is 52CM high and 3mm thick. The overall rotary ball dust removal is divided into three parts. A partition is set up in the first and second rotary ball areas, and a second partition is set up in the second and third rotary ball areas.
3、 Advantages of the rotating ball dust removal device in the desulfurization tower:
1. Widely applicable
The rotary ball dust removal device of the desulfurization tower has a wide range of applications and can be directly welded according to the desulfurization tower, without being limited by range and size. It has a circular fitting structure and can be installed with small gaps. Suitable for various types of desulfurization and dust removal towers.
2. Reliable operation reduces safety hazards
1) The overall spinning device is welded with 316L stainless steel material, and the upper and lower top covers are made of stainless steel bars measuring 4cm x 15cm -4cm x 25cm to prevent ball running during spinning operation. The rotating ball device is tightly attached to the desulfurization tower wall around it, without the need for sealing, reducing the safety hazards of the rotating ball device operation.
2) Lock and lock the outer side of the protective device to prevent personnel from entering at will; When personnel need to enter the elevator shaft for construction, they should inform the project in advance to collect the key and enter the shaft for construction. After personnel enter, they should lock the inside to prevent external personnel from entering;
3. The rotary ball dust removal device is easy to maintain. During major equipment repairs, the top cover can be replaced with a movable door and a pin structure. The rotary ball cleaning, replacement, and replenishment work can be carried out by disassembling the top cover for quick operation.
4. The overall spinning ball device saves costs
The overall spinning ball device is made of 316L material, which is acid and corrosion resistant, has strong rigidity and good plasticity, and can be used for a long time, saving costs.
Advantages: Achieve efficient dust removal. Due to the presence of some liquid droplets in the rising flue gas and the periodic flushing of industrial water by the flushing system, a liquid film is formed on the surface of the packing ball. When small particles of dust in the flue gas enter the XQ-1 rotary ball high-efficiency dust removal and defogging device, the flue gas undergoes inertial collision, diffusion, adhesion, aggregation and other effects on the packing ball, causing the dust particles and water droplets to contact and be captured. After gravity settling and washing, the dust particles and gas are separated. At the same time, the regular movement of the packing ball and the continuous addition of slurry carried by the flue gas wash the dust particles attached to the surface of the packing ball, continuously updating the liquid film on the surface of the packing ball. This cyclic dust removal can ensure the secondary high-efficiency dust removal effect (dust removal before entering the desulfurization device is considered as primary dust removal).
Realize efficient defogging. The fog droplets carried in the flue gas are captured by the surface of a single packing ball due to inertial impact, and the packing balls of the XQ-1 rotary ball high-efficiency dust removal system collide with each other and continuously aggregate to become larger. Until the gravity of the gathered droplets exceeds the upward force of the flue gas, they will fall back into the slurry pool at the bottom of the absorption tower from the XQ-1 rotary ball high-efficiency dust and mist removal device. After passing through the XQ-1 rotary ball high-efficiency dust and mist removal device, the flue gas can ensure efficient mist removal effect.
High mass transfer efficiency. Due to the reaction mechanism of the XQ-1 rotary ball high-efficiency dust removal and defogging device technology, a specially designed system generates turbulent space for gas-liquid rotation and agitation. The gas-liquid solid three-phase fully contacts, reducing the gas-liquid film mass transfer resistance, improving the mass transfer rate, and rapidly completing the mass transfer process, thereby achieving the goal of improving dust removal and defogging efficiency. Compared with similar dust removal technologies, this technology not only has the advantages of stable operation, low consumption, and simple maintenance, but also has the advantages of high dust removal and defogging efficiency.
Solved the problem of traditional defoggers being prone to scaling and clogging. Compared to static baffle defoggers, the XQ-1 rotary ball high-efficiency dust removal and defogging device has self-cleaning function. When dust adheres to the surface of the packing ball, it will peel off due to the movement, collision, and friction of the packing ball, thus solving the possibility of scaling and blockage in the XQ-1 rotary ball high-efficiency dust removal and defogging device.
Strong adaptability. Firstly, the system is less affected by changes in smoke volume and has strong stability under different operating conditions. Secondly, coal has a wide range of adaptability and has little impact on changes in dust concentration at the flue gas inlet.
Process water flushing system
The function of the process water flushing system is to regularly flush the high-efficiency dust removal and defogging device of the rotary ball, usually consistent with the original defogger flushing. It is usually flushed once every 1-2 hours, with each flushing lasting 2-5 minutes, to avoid excessive adsorption of dust by the rotary ball high-efficiency dust removal operation system and affect its effectiveness. At the same time, a certain amount of water is added to ensure that there is always a liquid film in the rotary ball high-efficiency dust removal operation system, ensuring the stability of the system's dust removal. This dust removal project considers the actual situation on site and tries to use the original defogger flushing water source as much as possible.
Differential pressure resistance: When the desulfurization tower is running stably, the pressure difference at the inlet/outlet of the high-efficiency dust removal and mist removal device with a rotating ball is less than 500Pa.
Original design: (3) byproduct treatment system
In the desulfurization system, SO2 reacts with CaO to produce calcium sulfite and calcium bisulfite. These two products are not conducive to treatment and are unstable in air, easily oxidizing to form sulfate complexes. Considering the convenience of operation, two oxidation fans are set up to blow air into the slurry pool of the desulfurization tower, forcing the oxidation reaction between calcium sulfite and calcium bisulfite to produce dihydrate calcium sulfate (gypsum). The desulfurization tower pit installed in the desulfurization system meets the requirements for absorption tower overflow.
The calcium sulfate slurry generated in the desulfurization system enters the cyclone separator through the gypsum discharge pump. The cyclone separator uses the cyclone force to preliminarily separate the calcium sulfate slurry and reduce the water content of the slurry. The slurry separated by cyclone is divided into two parts. The supernatant flows back into the absorption tower through the reflux pipe for further utilization, while the concentrated slurry enters the vacuum belt dewatering machine.
The vacuum belt dewatering machine uses a water ring vacuum pump to generate adsorption vacuum to remove water from the concentrated slurry, achieving the effect of dewatering. The dehydrated slurry has a low moisture content and can be transported for comprehensive treatment. The waste generated by desulfurization mainly contains CaSO4 · 2H2O CaSO3， Impurities such as silicates have a low utilization rate. In this plan, desulfurization waste is stored in the gypsum room and treated uniformly by the bidding party.
The original design was for the desulfurization slurry to circulate inside the tower. When there is too much slurry, the excess slurry will enter the desulfurization tower pit through the overflow pipe at the top of the slurry pool. The slurry in the pit is transported to the accident slurry pool by the pit pump, and the slurry in the lower slurry pool of the desulfurization tower is pumped to the dewatering room by the gypsum discharge pump, entering the cyclone separator, and then processed by the vacuum belt dewatering machine after separation. Dehydrated gypsum is transported or comprehensively utilized.
Through technological comparison and innovation, the desulfurization slurry is circulated inside the tower. When there is too much desulfurization slurry or the desulfurization tower regularly discharges pollutants, the discharged slurry is discharged to an external oxidation tank. The oxidation tank is equipped with 0.25MAa compressed air and a propeller at the bottom for explosion and disturbance, so that the desulfurization slurry is fully oxidized and forms a circulation with the slurry inside the tower. One oxidation slurry delivery pump is installed in the oxidation tank to transport the oxidized desulfurization slurry and discharge the sewage. The discharged sewage is transported to the sludge tank, and the desulfurization waste liquid in the sludge tank is transported to the plate filter press for pressure filtration to obtain gypsum filter cake. The wastewater is discharged to the water purifier for sedimentation, and then discharged to the sewage treatment after sedimentation.
3. Advantages of the present invention
Process characteristics and advantages
The lime gypsum desulfurization technology has the following characteristics and advantages:
(1) High desulfurization efficiency, up to 99% or more, especially suitable for flue gas desulfurization of medium to high sulfur coal;
(2) Low investment, low operating costs, advanced equipment development, minimal land occupation, and compact layout;
(3) Easy to operate. High level of automation control, easy for operators to master;
(4) The system is located after the boiler induced draft fan and has a bypass flue. The desulfurization system is relatively independent, and its operation will not affect the main facilities. It is also easy to maintain and repair;
(5) Low desulfurization cost;
(6) Low system resistance, good dehydration effect, complete internal anti-corrosion, long service life;
(7) The comprehensive utilization of by-products is in line with the technological policies of the sulfur dioxide industry.
System structure
absorption tower
The absorption tower of the lime gypsum desulfurization system adopts a vertical spray tower, which includes a stirrer, a high slurry overflow system, a spray layer, a defogger, etc.
All components inside the absorption tower can withstand the impact of the maximum inlet airflow and the highest inlet flue gas temperature, and high-temperature flue gas does not cause damage to any system or equipment. The desulfurization tower is made of carbon steel and glass flake anti-corrosion material.
The materials selected for the absorption tower are suitable for the characteristics of the process and can withstand the wear and tear of flue gas fly ash and solid suspended solids in desulfurization processes. All components, including the tower body and internal structure design, take into account corrosion allowance.
The absorption tower is designed with an airtight structure to prevent liquid leakage. To ensure the integrity of the shell structure, welding connections should be used as much as possible, and flange and bolt connections should only be used when necessary. The manholes, passages, connecting pipes, etc. on the tower body need to be sealed at the perforation of the shell to prevent leakage.
The design of the absorption tower shell should be able to withstand pressure loads, pipeline forces and moments, wind loads and seismic loads, as well as all other loads imposed on the absorption tower. The support and reinforcement components of the absorption tower should be able to fully prevent the tower body from tilting and shaking.
The design of the tower body should avoid the formation of dead corners as much as possible, and mixing measures should be taken to prevent the sedimentation of slurry in the slurry pool. The absorption tower is designed with an airtight structure to prevent liquid leakage. To ensure the integrity of the shell structure, welding connections should be used as much as possible, and flange and bolt connections should only be used when necessary. The manholes, passages, connecting pipes, etc. on the tower body need to be sealed at the perforation of the shell to prevent leakage.
The bottom of the absorption tower is designed with a quick discharge outlet.
The absorption tower is equipped with sufficient nozzles.
The overall design of the tower facilitates the inspection and maintenance of the internal components. The spray system and supports inside the absorption tower minimize the accumulation of dirt and scaling, and are equipped with channels for easy cleaning.
Reasonable design of oxidation area, reasonable arrangement of oxidation air spray gun and distribution pipe.
The stirring system of the absorption tower ensures that there is no precipitation, scaling, or blockage of the gypsum slurry inside the tower at any time.
The inlet section of the absorption tower flue can prevent the backflow of flue gas and the accumulation of solid matter.
The absorption tower is equipped with a sufficient number and appropriate size of manhole doors and observation holes, which must not have leaks, and walkways or platforms should be set up nearby. Observation holes must be installed in the defogger area. The size of the manhole door should be at least DN800, easy to open and close. A handle should be installed on the manhole door, and if necessary, a ladder should be installed.
The absorption tower system also includes all necessary on-site and remote measuring devices, providing at least measuring points for absorption tower liquid level, pH value, temperature, pressure, defogger pressure difference, as well as flow measurement devices for lime slurry and gypsum slurry.
Spray layer
The slurry spray system inside the absorption tower consists of spray pipes, nozzles, and necessary components. The design of the spray system can reasonably distribute the required spray volume, ensure uniform flow of flue gas, and ensure sufficient contact and reaction between lime slurry and flue gas.
All nozzles can avoid rapid wear, scaling, and blockage, and the nozzle material is made of silicon carbide or equivalent materials. The nozzle adopts vortex flow to avoid the situation where the spiral nozzle is prone to blockage and breakage. The design of nozzles and pipelines facilitates maintenance, flushing, and replacement.
The absorption tower is equipped with a large number of nozzles in the spray layer, and the spray angle should have a certain proportion of overlap.
The nozzles around the tower wall adopt a semi fan-shaped form to avoid damage to the anti-corrosion layer of the tower wall caused by prolonged flushing of the slurry.
Spray pipe material: FRP， The thickness is 12-20mm, and both the inner and outer surfaces of the spray pipe are treated with silicon carbide for wear resistance, enhancing the wear resistance of the spray pipe.
Number of floors: 4
Location: Located in the middle of the absorption tower.
Mist remover (desulfurization tower dust removal)
The demister can be installed on the upper part of the absorption tower, about 2.2 meters away from the spray, to separate the mist droplets carried by the clean flue gas. The droplet content of the flue gas at the outlet of the defogger shall not exceed 75mg/Nm3 (dry basis).
The design of the defogger ensures its high usability and good droplet removal effect.
The defogger adopts a streamlined design, considering that both stages of defoggers use the same height, that is, reducing the height of the original higher defogger and appropriately increasing the spacing between the defogger blades to reduce the probability of defogger blockage.
The design of the defogger system should pay special attention to the influence of the fly ash concentration at the inlet of the desulfurization device. The system also includes a flushing and drainage system for removing sediment from the defogger, which can be automatically or manually flushed according to a given or variable program during operation.
The material of the defogger is reinforced flame-retardant polypropylene, which can withstand high-speed water flow erosion, especially caused by manual flushing. The selected material shall be submitted to the bidding party for confirmation.
The arrangement of internal channels is suitable for the installation and disassembly of internal components during maintenance.
The defogger flushing system can comprehensively flush the defogger without any surfaces that have not been flushed. Monitor and control the pressure of the flushing water, and arrange the flushing main pipe to ensure that each nozzle operates at an average water pressure.
The layout of the defogger can be considered in conjunction with the design of the absorption tower to facilitate operation and maintenance.
The flushing water for the demister is specialized industrial water for the factory area, provided by a specially set demister flushing water pump, and considered to be powered by a security power supply in case of an accident.
The defogger will be installed as a single component. And the components can be accessed through the nearby absorption tower manhole door.
All defogger components, flushing headers, and flushing nozzles are easily accessible for inspection and maintenance. The designed defogger support beam can serve as a maintenance channel and can withstand a live load of at least 400kg/m2.
Material Science: PPR， level 2
Location: Located at the top of the absorption tower.
The system resistance is less than 300Pa.
Lime powder silo
Used for storing lime powder, the capacity of the powder silo meets the 5-day lime powder consumption under the design conditions of flue gas desulfurization for one boiler.
The discharge outlet is designed with anti blocking measures.
There is an emergency exhaust valve at the top of the lime powder silo.
The upper part of the lime powder silo is equipped with a bag filter to prevent secondary dust. The ventilation dust collector in the powder silo is a pulse bag filter, and the maximum dust content of the clean gas at the outlet of the bag filter is less than 10mg/Nm3.
The powder warehouse provides one continuous level indicator to achieve continuous display of the level.
Design necessary stair platforms for the maintenance and repair of dust collectors and level gauges.
The bottom of the lime powder silo should be equipped with a gasification device, and the gas source should be dry to prevent the agglomeration of lime powder
Lime slurry tank
Mainly used for preparing and storing qualified lime slurry, lime is transported to the desulfurization lime tank through the Jiaolong conveyor. The top of the tank is equipped with a stirring system, which fully disturbs the water and lime, fully reacts into desulfurization solution, and is pumped into the desulfurization tower through the conveying pump.
Oxidation slurry pool
The oxidation slurry pool can be used for system accidents. When the desulfurization system is out of operation and the absorption tower needs maintenance, the slurry in the tower can be temporarily stored in the accident slurry pool. The capacity of the accident slurry pool meets the slurry capacity of the desulfurization tower under full load.
In daily operation, as long as the purpose is to use the external circulation oxidation of the slurry inside the tower, improve the usage time of the desulfurization slurry, increase the utilization rate of the slurry, and reduce costs.
Absorption tower agitator
The agitator in the desulfurization system should meet the following conditions:
The absorption tower slurry is equipped with three side mixing devices to prevent the slurry from settling and clumping.
The agitator adopts an all metal or rubber lined structure, and all agitator components that come into contact with the stirred fluid are made of materials that are suitable for the characteristics of the stirred fluid, including wear resistance and corrosion resistance.
Mist remover flushing water pump
The demister flushing water pump is mainly used to flush the demister.
The defogger water pump adopts a centrifugal pump.
Advantages of desulfurization tower dust removal system;
Gas uniformly improves dust and mist removal efficiency. Uneven gas distribution in general absorption towers is an important reason for low efficiency and high operating costs in defogging and dust removal inside the tower. The desulfurization tower equipped with the XQ-1 rotary ball dust removal and dehazing device has a unique flow design that allows the rotary ball dust removal and dehazing packing ball system to rotate and revolve in a circular motion inside the tower. The flue gas is dispersed and gathered multiple times, promoting more thorough and uniform gas-liquid contact. The gas equalization effect is 200% to 300% higher than that of a typical empty tower, allowing the device to operate in a very economical and stable state, thereby maintaining the dust removal and dehazing efficiency at a stable level;
Realize secondary desulfurization. The XQ-1 rotary ball dust removal and defogging device utilizes the slurry droplets carried up by the spray layer slurry with the flue gas to form a liquid film on the surface of each packing ball in the rotary ball dust removal system and continuously update it. With the regular movement of the XQ-1 rotary ball dust removal and defogging device, it will disperse and reorganize the gas field distribution when the flue gas passes through, greatly increasing the gas-liquid contact area and time, and continuously changing the flow direction of the flue gas through the cutting of the flue gas by the movement of the packing ball, thus achieving the effect of secondary desulfurization (empty tower spraying is considered as primary desulfurization).
Implement dust removal. Due to the presence of some liquid droplets in the rising flue gas and the periodic flushing of industrial water by the flushing system, a liquid film is formed on the surface of the packing ball. When small particles of dust in the flue gas enter the XQ-1 rotary ball dust removal and dehazing device, the flue gas undergoes inertial collision, diffusion, adhesion, aggregation and other effects on the packing ball, causing the dust particles and water droplets to contact and be captured. After gravity settling and washing, the dust particles and gas are separated. At the same time, the regular movement of the packing ball and the continuous addition of slurry carried by the flue gas wash the dust particles attached to the surface of the packing ball, continuously updating the liquid film on the surface of the packing ball. This cyclic dust removal can ensure the secondary dust removal effect (dust removal before entering the desulfurization device is considered as primary dust removal).
Implement defogging. The fog droplets carried in the flue gas are captured by the surface of a single packing ball due to inertial impact, and the packing balls of the XQ-1 rotary ball dust removal system collide with each other and continuously gather to become larger. Until the gravity of the gathered droplets exceeds the upward force of the flue gas, they will fall back into the slurry pool at the bottom of the absorption tower from the XQ-1 rotary ball dust and mist removal device. After passing through the XQ-1 rotary ball dust removal and defogging device, the smoke can ensure the defogging effect.
High mass transfer efficiency. Due to the reaction mechanism of the XQ-1 rotary ball dust removal and dehazing device technology, a specially designed system generates turbulent space for gas-liquid rotation and agitation. The gas-liquid solid three-phase fully contacts, reducing the gas-liquid film mass transfer resistance, improving the mass transfer rate, and rapidly completing the mass transfer process, thereby achieving the goal of improving dust removal and dehazing efficiency. Compared with similar dust removal technologies, this technology not only has the advantages of stable operation, low consumption, and simple maintenance, but also has the advantages of high dust removal and defogging efficiency.
Solved the problem of traditional defoggers being prone to scaling and clogging. Compared to static baffle defoggers, the XQ-1 rotary ball dust removal and defogging device has self-cleaning function. When dust adheres to the surface of the packing ball, it will peel off due to the movement, collision, and friction of the packing ball, thus solving the possibility of scaling and blockage in the XQ-1 rotary ball dust removal and defogging device.
Strong adaptability. Firstly, the system is less affected by changes in smoke volume and has strong stability under different operating conditions. Secondly, coal has a wide range of adaptability and has little impact on changes in dust concentration at the flue gas inlet.
Process water flushing system
The function of the process water flushing system is to regularly flush the rotary ball dust removal and defogging device, usually consistent with the flushing of the original defogger. Generally, it is flushed once every 1-2 hours, with each flushing lasting 2-5 minutes, to avoid excessive adsorption of dust by the rotary ball dust removal operation system and affect its effectiveness. At the same time, a certain amount of water is added to ensure that there is always a liquid film in the rotary ball dust removal operation system, ensuring the stability of the system's dust removal. This dust removal project considers the actual situation on site and tries to use the original defogger flushing water source as much as possible.
Differential pressure resistance: When the desulfurization tower is running stably, the pressure difference at the inlet/outlet of the rotary ball dust removal and defogging device, that is, the resistance, is less than 500Pa.
