Ammonia absorption of chemical flues gas by acid solution in a water-sparged aerocyclone reactor

doi:10.16085/j.issn.1000-6613.2016.s1.005

Abstract

Abstract: In order to overcome the disadvantage of low efficiency and serious scaling and clogging in traditional ammonia absorption process using packed beds as the absorber.In this paper, water-sparged aerocyclone (WSA), a new gas-liquid mass transfer equipment was used for ammonia absorption of chemical flues gas by dilute sulphuric acid solution.The effect of operation parameters of initial ammonia concentration, flues gas inlet velocity and WSA structure parameters of sparge hole area and diameter of vortex finder on ammonia absorption efficiency were investigated.The results showed that the ammonia absorption efficiency increased firstly and then decreased with the increase of initial ammonia concentration and flues gas inlet velocity.It increased fast at first and then tended to increase slowly with the increase of sparge hole area, however, it decreased with the increase of diameter of vortex finder.When initial ammonia concentration of 4500mg/m³, flues gas inlet velocity of 26.46m/s, using the WSA of sparge hole area of 565.5mm² and diameter of vortex finder of 32mm, the ammonia absorption efficiency could be as high as more than 99.5%.These results provide a kind of alternative for ammonia absorption of chemical flues gas in chemical industry.

Key words: gas cyclone, absorption, gas-liquid flow, separation

摘要： 针对工业尾气中氨气吸收存在的传质效率低、设备易于堵塞等问题,本文采用新型超重力气液传质设备水力喷射空气旋流器(WSA),以稀硫酸溶液为吸收剂,开展了氨气吸收处理研究。研究考察了初始NH₃浓度、进口气速、喷孔面积以及中心排气管直径等操作参数和WSA结构参数对氨气吸收处理效率的影响。研究结果表明,NH₃吸收率随着初始NH₃浓度和进口气速的增大均呈现先增大后降低的规律。NH₃吸收率随着WSA的喷孔面积的增大先增大后趋于平缓,但却随着WSA的中心排气管直径的增大而降低,但压降也随之增大。在NH₃浓度为4500mg/m³左右,进口气速为26.46m/s时,采用喷孔面积为565.5mm²、中心排气管直径为32mm的WSA,NH₃吸收去除率可达99.5%以上。该工艺在工业尾气中的NH₃回收处理方面具有较大的应用前景。

关键词: 气体旋流器, 吸收, 气液两相流, 分离

CLC Number:

TQ028
X51

CHENG Zhiliang, QUAN Xuejun, XU Fei, DAI Mingxing. Ammonia absorption of chemical flues gas by acid solution in a water-sparged aerocyclone reactor[J]. Chemical Industry and Engineering Progree, 2016, 35(S1): 26-30.

程治良, 全学军, 徐飞, 代明星. 水力喷射空气旋流器用于吸收处理工业尾气中的氨气[J]. 化工进展, 2016, 35(S1): 26-30.

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