循环流化床锅炉尾部增湿活化深度脱硫工艺研究

Research on Deep Desulfurization Process of CFB Boiler Tail Humidification and Activation

在传统炉内喷钙与尾部增湿活化(LIFAC)烟气脱硫工艺基础上,充分利用循环流化床(CFB)锅炉炉内脱硫特性,提出CFB锅炉尾部增湿活化深度脱硫工艺。该工艺未设塔底灰及电除尘灰循环系统,喷水增湿活化器可当作一级喷水增湿除尘装置,既简化了工艺系统,降低了初投资,又利于除尘;喷水增湿活化器出口烟气与未进行脱硫反应的烟气混合升温后进入除尘器,避免了使用预热空气加热脱硫烟气的弊端;该脱硫系统可单独操作,解列后不影响锅炉正常运行,为提高CFB锅炉脱硫效率提供了重要的参考依据。

Based on the conventional flue gas desulfurization process of limestone injection into the IUrnace and activation of calcium oxide （LIFAC）, fully use of circulating fluidized bed （CFB） boiler furnace desulfurization characteristics, deep desulfurization process of CFB boiler tail humidification and activation was raised. The process did not have tower bottom ash and ESP ash recycling system, water spray reactivation vessel can be used as a water spray dust removal device, which could simplify the process system, reduce the initial investment, and be conducive to dust removing. The flue gas of water spray reactivation vessel exit was mixed with flue gas of no desulfurization reaction, heating up and sent into precipitators, which avoided the use of preheated air to heat flue gas. The desulfurization system could operate independently, and splitting did not affect the normal operation of the boiler. The result could provide an important reference for improving the desulfurization efficiency of CFB boiler.