The retrofitting of desulfurization technology in coal powder boilers with the addition of a calcium injection desulfurization system can serve as an auxiliary desulfurization system for power plants. Taking advantage of the low nitrogen combustion system, the desulfurization efficiency can reach 40% when the calcium sulfur molar ratio {: img alt} Ca/S=1.5. Reduce the SO2 content in flue gas from combustion. When using high sulfur coal, the calcium injection system in the furnace is put into operation for desulfurization, which can reduce the SO2 content in the flue gas entering the tail desulfurization system, alleviate the burden on the desulfurization system, and ensure that SO2 emissions meet the standard.
Project Overview: Glass Kiln. The current NOx emissions cannot meet the new standard of less than 300mg/Nm3. In response to the overall deployment of the Ministry of Environmental Protection on air pollution control, the glass kiln will undergo denitrification transformation. 2. The design principles of this preliminary technical proposal are applicable to the selective catalytic reduction (SCR) flue gas denitrification device for glass kilns. The overall design principles of flue gas denitrification technology include: (1) adopting selective catalytic reduction denitrification (SCR) process. (2) Two sets of furnace reducing agent preparation systems are shared. (3) Use 20% concentration finished ammonia water purchased externally as a denitrification reducing agent. (4) The control system of the denitrification device adopts DCS (shared control room and hardware with the DCS of the existing denitrification system). (5) Ensure the injection area of the reducing agent
The utility model invention patent relates to a tube type nozzle group for a coal feeding port of a fluidized bed boiler, which includes a coal feeding pipeline, a raw coal spreading air duct, a furnace wall, a coal feeding port, a raw arc-shaped coal spreading air outlet, a tube type nozzle, a coal spreading air box, a material layer, and a tube type nozzle group. The feature is that a tube type nozzle is set below the coal feeding port, and 8 tube type nozzles form a tube type nozzle group. The tube type nozzle group is rectangular in shape, and the tube type nozzle group is built into the coal spreading air box. The volume of the coal spreading air box is several times that of the raw coal spreading air duct.
The process flow of polymer SNCR denitrification is that the solid-state polymer denitrification process is an in furnace denitrification process, which adopts a powder gas-phase automatic conveying system. Several suitable positions are selected at the furnace flue gas outlet and the high-temperature zone of the furnace to drill holes and inject polymer denitrification agents. NOx is reduced to N2 and H2O in the appropriate reaction temperature zone.
Traditional coal washing methods can remove a portion of mercury from non combustible mineral raw materials, but cannot remove mercury bound to organic carbon in the coal. This can only transfer mercury from coal to coal washing waste, but it still has a positive impact on reducing mercury in flue gas. On average, 51% of mercury can be removed during coal washing.
Technical characteristics of polymer SNCR denitrification process: 1. High denitrification efficiency; As is well known, the denitrification efficiency of ammonia based SNCR is generally between 40-60%, while the denitrification efficiency of polymer SNCR can reach over 85% Up there. 2. Simple process, easy to use, flexible spatial layout; The standardized airflow mixing and conveying integrated device is not limited by the site and space of existing denitrification sites, and is particularly suitable for occasions with strict requirements for SCR denitrification sites. 3. The project requires a small one-time investment. The integration, serialization, and standardization of airflow mixing and conveying devices do not require on-site construction and installation, greatly reducing one-time investment compared to SNCR and SCR processes. 4. Denitrification consumes less energy and has lower operating costs. The power requirements for the process equipment are very low, generally the entire process equipment is 20 "30kW
Has energy-saving and cleaning effects. After using polymer denitrification agents, the accumulation of ash and coking on the boiler tube wall will be alleviated or removed, which accelerates heat conduction and reduces heat loss, thus achieving energy-saving and cleaning effects. Compared with the traditional SNCR denitrification process, the solid-state polymer denitrification process does not require the injection of process water into the furnace and does not consume latent heat of gasification, thus improving the combustion efficiency of the boiler. The denitrification system has good safety. Compared with traditional SNCR denitrification processes, polymer SNCR denitrification processes do not use ammonia or liquid ammonia to reduce NOx, so there is no need to consider the safety issues caused by ammonia transportation and storage in process design. Therefore, the safety of SNCR in denitrification process is greatly improved.
A direct fired furnace consists of three parts: a combustion system, a flue gas system, and a control system: 1. The combustion system consists of a burner, a combustion air system, a gas supply system, and an ignition system. A burner: Two burners are set up in a staggered arrangement in the flue gas duct to facilitate uniform mixing of heated flue gas (facilitating uniform thermal expansion of the flue gas duct and uniform inlet temperature of SCR); B Combustion air system: Under normal circumstances, flue gas is used as the combustion air, In the fault state, switch to air assisted combustion; C ignition system: using plasma ignition; Shichu 2. The flue gas system consists of a flue gas diversion device, a combustion chamber, and a mixing chamber. The flue gas is divided into three streams by the diversion device, and the two streams on both sides flow through the combustion chamber from the outside for preheating. Afterwards and in the middle
At present, in the domestic boiler industry in China, due to the presence of S in fuels such as coal, oil, and natural gas, SO2 and SO3 are usually produced during combustion. SO2 and SO3 combine with H2O to form sulfurous acid or sulfuric acid vapor. When the temperature of the metal wall of the heating surface at the tail of the boiler is lower than the condensation point of sulfuric acid vapor (called the acid dew point), liquid sulfuric acid will form on its surface (called condensation). For a long time, corrosion of the tail heating surface of air preheaters caused by condensation has occurred frequently and is difficult to avoid. So much so that currently in boiler design, it is necessary to alleviate the occurrence of condensation and corrosion by increasing the exhaust gas temperature or using non-metallic materials with extremely poor heat transfer (such as enamel pipes), without fundamentally solving the problem. Simply increasing the exhaust temperature will inevitably result in a large amount of low-temperature energy
Boiler blowdown can control the salt content of boiler water, but it causes loss of working fluid and heat, so the amount of boiler blowdown should be limited. The amount of boiler blowdown is usually expressed by the blowdown rate P The pollution discharge rate is the percentage of the amount of pollution discharged to the boiler's evaporation capacity According to the "Regulations on Electric Power Technology Management (Trial)", the emission rate of condensing power plants is 1% to 2%, and the emission rate of thermal power plants is 2% to 5%
The thermal efficiency of a silicon crystal tube refers to the proportion of the energy released after heating the tube to the entire heating product per unit time and per unit product. 1、 Characteristics of silicon crystal tubes: 1. The physical properties of silicon crystal tubes are very stable, with high mechanical strength, good seismic performance, and are not affected by external temperature changes; 2. Silicon crystal tube is resistant to acid and alkali, not affected by chemical corrosion, and has good corrosion resistance; 3. Silicon crystal tubes have characteristics such as high thermal conductivity, good sealing performance, and large resistance to thermal disconnection; 4. Silicon crystal tubes have advantages such as strong insulation resistance, environmental friendliness, and energy saving; 5. Compact structure, low thermal resistance, and small shrinkage coefficient at ordinary temperatures;
Zero leakage vacuum thermal energy recovery device technology and working principle: The zero leakage vacuum thermal energy recovery device is a new type of heat transfer element, which should be called a "closed two-phase heat transfer system" according to a more precise definition. It is a device that relies on the phase change of the fluid inside (liquid to vapor and vapor to liquid) to transfer heat in a closed system that has been evacuated. In recent years, zero leakage vacuum thermal energy recovery device technology has developed rapidly. Due to its advantages of fast heat transfer speed, high thermal efficiency, and low operation and maintenance costs, it has been widely used in various fields of waste heat recovery.
