焚烧炉烟气中HCl气体高温净化的温度选择

Choice of Reaction Temperature for Gaseous HCl High Temperature Removal from Incinerator Flue Gases

研究了普通石灰和改性石灰吸收HCl气体对应的平衡分压随温度的变化、石灰的热分解规律,以及温度对石 灰吸收HCl气体的最大反应率的影响,确定了焚烧炉烟气中HCl气体的最佳干式净化温度.研究表明:随温度升 高,石灰吸收HCl气体所对应的平衡分压升高;烟气中CO2分压提高,HCl的平衡分压亦升高,但是改性石灰可在一 定程度上消除CO2对HCl吸收的不利影响;当反应产物中有未反应石灰存在时,HCl平衡分压会明显下降.200℃ 时已达最大反应率的石灰在600℃时仍能继续反应.HCl高温净化温度可确定在600℃左右,并可用改性石灰为吸 收剂.

In order to choose optimum temperature for incinerator flue gas high temperature scrubbing with slake limes,influence of temperature on HCl equilibrium partial pressure,lime decomposition and lime conversion rates were investigated and the results showed that HCl equilibrium partial pressure was rising up as temperature and partial pressure of CO 2 in the flue gas were increased,but if there existed un-reacted Ca(OH) 2 in the products,the equilibrium partial pressure of HCl greatly descended. Also modified lime was more suitable for HCl absorption under circumstances when partial pressure of CO 2 was higher.The reacted slaked limes under 200 ℃ could regain their reactive abilities when the reaction temperature was raised to 600 ℃. The reaction temperature could be suggested to be around 600 ℃ for flue gas high temperature scrubbing and modified lime was recommended as absorbent.