吸附浓缩-蓄热催化燃烧工艺过程研究
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摘要
建立了一套VOCs气体吸附浓缩-蓄热催化燃烧中试设备并对其工艺条件进行了优化研究。该设备可实现VOCs的连续脱附且保持较高的脱附浓度水平,此浓缩气体经过预热后可直接进入蓄热催化燃烧系统进行矿化处理。实验采用二甲苯和活性炭分别作为VOCs气体和吸附剂,评价了吸附浓缩设备和蓄热催化燃烧设备的主要工艺条件参数。结果表明,当控制吸附浓缩设备的切换时间为60 min、吸附气浓度为1 500～4 000 mg/m3、脱附气流量为8 L/min、脱附温度为170℃、冷却气流量为40 L/min时,吸附尾气中VOCs含量基本为零,同时脱附浓度可满足起活温度为180℃、换向半周期为30 min的蓄热催化燃烧设备自热稳定运行,且VOCs去除率在95%以上。
A pilot-scale gas adsorption concentration-regenerative catalytic combustion facility for VOCs is set up and its operating conditions are optimized.This facility can achieve continuous desorption of VOCs with a high desorption concentration.After preheating,the concentrated desorption gas can enter directly the regenerative catalytic combustion system for mineralization treatment. Xylene and activated carbon are used as simulated VOCs gas and adsorbent,respectively.The main process parameters of adsorption concentration equipment and regenerative catalytic combustion equipment are evaluated.The results show that the concentration of VOCs is basically zero in the adsorbed gas when the switching time of adsorption concentration equipment is 60 min,the adsorption gas concentration is in the range of 1 500-4 000 mg·m-3,the flow rate of desorption gas is 8 L·min-1,the desorption temperature is set at 170℃ and the flow rate of cooling gas is 40 L·min-1. The desorption concentration can meet the self-heating and stable operation of the regenerative catalytic combustion equipment with 180℃ and 30 min reversal half cycle. What's more,the removal efficiency of VOCs is higher than 95%.
A pilot-scale gas adsorption concentration-regenerative catalytic combustion facility for VOCs is set up and its operating conditions are optimized.This facility can achieve continuous desorption of VOCs with a high desorption concentration.After preheating,the concentrated desorption gas can enter directly the regenerative catalytic combustion system for mineralization treatment. Xylene and activated carbon are used as simulated VOCs gas and adsorbent,respectively.The main process parameters of adsorption concentration equipment and regenerative catalytic combustion equipment are evaluated.The results show that the concentration of VOCs is basically zero in the adsorbed gas when the switching time of adsorption concentration equipment is 60 min,the adsorption gas concentration is in the range of 1 500-4 000 mg·m-3,the flow rate of desorption gas is 8 L·min-1,the desorption temperature is set at 170℃ and the flow rate of cooling gas is 40 L·min-1. The desorption concentration can meet the self-heating and stable operation of the regenerative catalytic combustion equipment with 180℃ and 30 min reversal half cycle. What's more,the removal efficiency of VOCs is higher than 95%.
引文
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[2]夏积恩.流向变换催化燃烧反应系统特性与数值模拟[D].杭州:浙江大学,2008.
[3]Debasish,GAUR,Vivekanand,et al. Removal of volatile organic compound by activated carbon fiber[J]. Carbon,2004,42(14):2949-2962.
[4]刘寒冰,姜鑫,王新,等.PDMS基涂层活性炭对甲苯、苯和丙酮吸附研究[J].环境科学,2016,37(4):1287-1294.
[5]Bikshapathi M,Mandal S,Manthur G N,et al.Modification of activated carbon fiber by metal dispersion and surface functionalization for the removal of 2-chloroethanol[J]. Industrial&Engineering Chemistry Research,2011,50(50):13092-104.
[6]Edouard D,Hammouri H,Zhou X G. Control of a reverse flow reactor for VOC combustion[J]. Chemical Engineering Science,2005,60(6):1661-72.
[7]王盈,朱吉钦,李成岳.低浓度甲烷流向变换催化燃烧取热技术[J].北京化工大学学报:自然科学版,2006,33(5):14-7.
[8]邓琴琴,杨旭东.建材VOC吸附特性的研究进展[J].暖通空调,2009,39(4):108-112.
[9]闫勇.有机废气中挥发性有机物(VOC)的净化回收技术———炭吸附和膜分离[J].化工进展,1996,(5):26-28.
[10]童经义.VOCs换向催化燃烧的过程模拟与控制[D].上海:华东理工大学,2013.
[11]Beld B V D,Borman R A,Derkx O R,et al.Removal of volatile organic compounds from polluted air in a reverse flow reactor:An experimental study[J].Industrial&Engineering Chemistry Research,1994,33(12):2946-2956.