What are the advantages and disadvantages of circulating fluidized bed boilers?

　　1) Wide fuel adaptability. The circulating fluidized bed boiler can burn both high-quality coal and low-quality fuel. A large number of circulating fluidized bed boilers burning coal gangue, coal slime, oil shale, petroleum coke, slag, bark, waste wood, sludge, garbage and other special fuels have been put into production and application at home and abroad.

　　2) The combustion is stable and efficient. Thanks to the existence of a large amount of high-temperature materials, the fuel is quickly heated to exceed the ignition temperature after entering the furnace. Because the amount of fuel is very small compared with the amount of high-temperature materials, the circulating fluidized bed boiler does not have the problem of fire extinguishing and combustion instability. However, most of the unburned fuel can be circulated multiple times through the cyclone separator, with long residence time and high combustion efficiency.

　　3) Superior environmental performance. Circulating fluidized bed boilers can significantly reduce flue gas sulfur dioxide emission concentration by adding limestone furnace for desulfurization, and the original emission of nitrogen oxides is also lower than that of pulverized coal boilers. The temperature of the cyclone separator area of the circulating fluidized bed boiler is particularly suitable for the SNCR denitration process. Injecting reducing agents such as urea solution or ammonia water can achieve a denitration efficiency of 65% to 85% (the denitration efficiency of the SNCR denitration process for pulverized coal boilers is generally 40% About), no need to use expensive SCR denitration process.

　　4) The fuel preparation system is simple. The coal feed particles are 0~13mm or 0~8mm wide, there is no coal grinding system, which is greatly simplified compared with the pulverized coal boiler.

　　5) Good load regulation performance. The load adjustment range of the circulating fluidized bed boiler can reach 4:1, and the load adj