富氧燃烧模拟烟气石灰石-石膏湿法脱硫试验研究

为了研究富氧燃烧情况下烟气石灰石-石膏湿法脱硫系统的效率,在自行搭建的富氧燃烧烟气石灰石-石膏湿法脱硫实验台上进行脱硫试验,通过控制脱硫系统中的CO₂浓度（体积分数14%、60%、70%、80%和90%）,研究富氧燃烧气氛下不同烟气流速、液气比、入口SO₂浓度以及浆液pH值对SO₂脱除特性的影响。发现随着烟气流速和入口SO₂浓度的增加,液气比和浆液pH值的减小,脱硫效率逐渐减小,系统中CO₂浓度越大,脱硫效率越小;对不同CO₂浓度气氛和浆液pH下的石膏晶体进行粒度分析和SEM电镜扫描,发现浆液pH值和CO₂对石膏的结晶并不会产生明显的影响。

Experimental Study on Limestone-Gypsum Wet Desulphurization with Simulated Flue Gas under Oxygen-Enriched Combustion

To study the efficiency of limestone-gypsum wet flue gas desulfurization under oxygen-enriched combustion, the desulfurization test is conducted on the self-established experiment rig. Through controlling the CO₂ concentration(the volume fractions as 14%, 60%, 70%, 80% and 90%) in the desulfurization system, the impacts of different flue gas velocity, liquid gas ratio, inlet SO₂ concentration, and slurry pH value on the SO₂ absorption characteristics under the oxygen-enriched combustion atmosphere are studied. It is discovered that with the increase of flue gas velocity and inlet SO₂ concentration, and the decrease of gas liquid ratio and slurry pH value, the desulfurization efficiency drops; the higher CO₂ concentration in the system, the lower desulfurization efficiency is observed. Meanwhile, under different CO₂ concentration atmosphere and slurry pH value, the gypsum crystal grain size is studied by using the laser particle analyzer and the gypsum is scanned by using the SEM electron microscope, from which it shows that the slurry pH value and the CO₂ concentration do not have obvious impacts on the crystallization of gypsum.