Flue gas circulating fluidized bed desulfurization process

The flue gas circulating fluidized bed desulfurization process consists of absorbent preparation, absorption tower, desulfurization ash recycling, dust collector and control system. In this process, dry hydrated lime powder is generally used as absorbent, and other dry powder or slurry with absorption and reaction ability to sulfur dioxide can also be used as absorbent.

由锅炉排出的未经处理的烟气从吸收塔(即流化床)底部进入。吸收塔底部为一个文丘里装置，烟气流经文丘里管后速度加快，并在此与很细的吸收剂粉末互相混合，颗粒之间、气体与颗粒之间剧烈摩擦，形成流化床，在喷入均匀水雾降低烟温的条件下，吸收剂与烟气中的二氧化硫反应生成CaSO3 和CaSO4。脱硫后携带大量固体颗粒的烟气从吸收塔顶部排出，进入再循环除尘器，被分离出来的颗粒经中间灰仓返回吸收塔，由于固体颗粒反复循环达百次之多，故吸收剂利用率较高。

The untreated flue gas discharged from the boiler enters from the bottom of the absorption tower (i.e. fluidized bed). There is a venturi device at the bottom of the absorber. The flue gas accelerates after flowing through the venturi tube, and is mixed with very fine absorbent powder here. There is fierce friction between particles and between gas and particles to form a fluidized bed. Under the condition of spraying uniform water mist to reduce the flue gas temperature, the absorbent reacts with sulfur dioxide in the flue gas to form CaSO3 and CaSO4. After desulfurization, the flue gas carrying a large amount of solid particles is discharged from the top of the absorption tower and enters the recycling dust collector. The separated particles return to the absorption tower through the middle ash bin. Because the solid particles are recycled for hundreds of times, the utilization rate of absorbent is high.

此工艺所产生的副产物呈干粉状，其化学成分与喷雾干燥法脱硫工艺类似，主要由飞灰、CaSO3、CaSO4和未反应完的吸收剂Ca(OH)2等组成，适合作废矿井回填、道路基础等。

The by-product produced by this process is in the form of dry powder. Its chemical composition is similar to that of the spray drying desulfurization process. It is mainly composed of fly ash, CaSO3, CaSO4 and unreacted absorbent Ca (OH) 2. It is suitable for waste mine backfilling, road foundation, etc.

典型的烟气循环流化床脱硫工艺，当燃煤含硫量为2%左右，钙硫比不大于1.3时，脱硫率可达90%以上，排烟温度约70℃。此工艺在国外目前应用在10~20万千瓦等级机组。由于其占地面积少，投资较省，尤其适合于老机组烟气脱硫。

For typical flue gas circulating fluidized bed desulfurization process, when the sulfur content of coal is about 2% and the calcium sulfur ratio is not greater than 1.3, the desulfurization rate can reach more than 90% and the flue gas temperature is about 70 ℃. This process is currently used in 100000 ~ 200000 kW units abroad. Because of its small floor area and low investment, it is especially suitable for flue gas desulfurization of old units.

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