Novel Impinging Stream Device for Wet Desulfurization and Dust-Removal of Flue Gas
As a novel technology in chemical engineering, gas-continuous impinging streams (GIS) has the important feature of significantly enhancing transfer between phases; while for the processes involving rapid reaction on surface of or inside particles/droplets in dispersed phase and thus controlled by gas-film diffusion its enhancing effect is remarkable. Wet flue gas desulfurization (FGD) with dehydrated lime as the absorbent falls into this category of processes. On the basis of investigations supported by NNSFC, the impinging stream gas-liquid reactor was developed, which has the striking advantages of simple structure with few inner parts, yielding much reduced hydraulic resistance and fouling on the walls, easy cleaning, and very high volumetric efficiency. With it as the absorber for wet FGD, a pilot plant test was made on the scale of 500 m 3 /h flue gas. Under the moderate conditions of Ca/S mole ratio 1.4 and liquid to gas flow rate ratio 0.8 L/m 3 , the sulfur-removal efficiency achieves 96％, while the pressure drop across the reactor is about 400 Pa only, indicating its performance is prior to other existing devices. The reactor has simultaneously the function of high efficient dust-removal. The scaling-up method was investigated in depth in order to suit the practical case of flue gas being generated from coal burning in huge amount, and the huge flowrate impinging stream gas-liquid reactor was developed and patented, which employs co-currently operated multigroup and multi-pair of impinging streams and each pair works on the same principles and in the same mode as in the reactor used in the pilot plant test, so that the so-called “scaling-up effect is avoided and the feasibility of large scale device is ensured. The new reactor is being applied industrially.
impinging streams gas-liquid reaction absorption flue gas desulfurization dusk-removal
WU Yuan ZHOU Yuxin
ISTech Novel Device Technologies Com. Ltd., Wuhan 430073, China;School of Chemical Engineering & Pha School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430073, China
国际会议
第四届中日化工学术研讨会(The 4th Joint China/Japan Chemical Engineering Symposium)(CJCES)
成都
英文
2007-12-19（万方平台首次上网日期，不代表论文的发表时间）