钠碱法烟气脱硫工艺技术

FGD Process Technology with Sodium Alkaline Method

采用乙烯废碱液作为吸收剂,对模拟烟气进行钠碱法烟气脱硫实验.主要考察了进口烟气温度、烟气含氧量、液气比、进口烟气SO_2浓度、烟气流速对脱硫效率的影响,并对采用该工艺技术的某厂进行经济效益分析,得出脱硫效率达到95%以上的工艺参数:进口烟气温度80~90℃、烟气含氧量5%~6%、液气比3.5 L/m^3、烟气流速3.5,~,4.5m/s等.以2.0%NaOH和7.2%Na2C03平均浓度及以上浓度乙烯废碱液的脱硫效率较高.此外,乙烯废碱液在烟气速度较低时具有一定的发泡趋势.

Experiments of simulated flue gas desulfurization （FGD） were carried out by using ethylene waste alkali liquor as absorbent. The influence of affecting factors including inlet gas temperature, oxygen content in flue gas, ratio of liquid to gas volume, SO2 concentration at the inlet of flue gas, and velocity of flue gas on the efficiency of flue gas desulfurization was studied. The economic benefit of this process technology used in a plant is analyzed. Experimental results show that desulfurization efficiency reached more than 95% of the process parameters： inlet flue gas temperature of 80~90 ℃, oxygen content of 5%~6% in flue gas, ratio of liquid to gas volume of 3.5 L/m3, flue gas velocity of 3.5~4.5 m/s. When ethylene waste alkali liquor concentration was 2.0% NaOH and 7.2% Na2CO3 or much more, the desulfurization efficiency is higher. In addition, ethylene waste alkali liquor had certain foaming tendency at low speeds of the flue gas.