洁净煤技术

2019, v.25;No.124(06) 24-31

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焦化行业VOCs排放特征与控制技术研究进展
Research progress on VOCs emission characteristics and control technology in coking industry

胡江亮;赵永;王建成;苗茂谦;
HU Jiangliang;ZHAO Yong;WANG Jiancheng;MIAO Maoqian;Key Laboratory of Coal Science and Technology,Ministry of Education and Shanxi Province,Taiyuan University of Technology;Shanxi Keling Catalytic Purification Technology Development Co.,Ltd.;

摘要(Abstract):

挥发性有机化合物(VOCs)是空气污染物特别是PM2.5和O3的重要前驱物,不仅对环境造成破坏,也给人类健康带来威胁。我国是最大的焦炭生产国,2018年全国焦炭产量4.38亿t,其生产过程中产生的污染物治理受到极大关注。经过近些年综合治理,污染物的治理已经从常规污染物逐渐过渡到非常规污染物,从有组织排放类(硫、氮化合物)污染治理过渡到无组织排放类(VOCs、NH3)治理。因此,焦化行业VOCs作为无组织排放类非常规污染物的典型代表,进行其排放特征与治理集成技术研究具有重要意义。笔者详述了焦化生产过程中VOCs废气产生节点,指出化产回收和焦油加工是VOCs排放的重点工序;按产生原理和逸散形式对VOCs废气的排放方式进行了分类;进一步总结对比各工段的废气性质和排放总量计算方法,明确了焦化行业VOCs排放的四大特征:排放节点多、差异大、组分复杂、异味重。在研究排放特征的基础上,从有/无组织2方面,分析了各种治理技术在焦化行业应用的可能性和发展趋势,并给出选择污染控制最佳适用技术的依据;最后,以太钢焦化和陕西黑猫焦化VOCs治理技术为背景,介绍了2种VOCs治理技术在焦化厂的应用,同时深入分析了焦化行业VOCs排放特征,为制定基于改善空气质量为目标的焦化行业VOCs控制策略提供科学可靠的技术支撑。
Volatile organic compounds(VOCs) are important precursors of air pollutants,especially PM2.5 and O3,which not only damage the environment,but also threaten human health. China is the largest country of producing coke and the coke output reached 438 million tons in 2018. Great attention has been paid to the treatment of pollutants produced in this production process. And after comprehensive treatment in recent years,the treatment of pollutants has gradually transitioned from conventional pollutants to unconventional pollutants,and from organized emissions(sulfur,nitrogen compounds) to unorganized emissions(VOCs,NH3). Therefore,as a typical representative of unconventional pollutants in the coking industry,it is great significant to study the integration characteristics of their emission characteristics and treatment of VOCs. In this paper,the VOCs emission nodes in coking process were described in detail,and it was pointed out that the chemical recovery and tar processing are the key processes of VOCs emission. According to the principle of production and the form of emission,the emission modes of VOCs were classified. The exhaust gas properties and total emission calculation methods of each section were further summarized and compared,and the four characteristics of VOCs emission in coking industry were clarified:many emission nodes,great difference,complex components,heavy odor. Based on the study of emission characteristics,the possibility and development trend of application of various treatment technologies in coking industry were analyzed from two aspects of with/without organization,and the basis for selecting the best applicable technology for pollution control was given. Finally,taking the VOCs treatment technologies of TISCO coking and Shaanxi Heimao coking as examples,the two application of VOCs treatment technologies in coking plant were introduced and the VOCs emission characteristics of coking industry in depth were analyzed,which provided scientific and reliable technical support for the formulation of VOCs control strategy of coking industry based on improving air quality.

关键词(KeyWords): 煤焦化;挥发性有机物(VOCs);排放特征;控制技术
coking;volatile organic compounds;emission characteristics;control technology

Abstract:

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基金项目(Foundation): NSFC-山西煤基低碳联合基金资助项目(U1710107);; 山西省应用基础研究面上青年基金资助项目(201801D221360)

作者(Author): 胡江亮;赵永;王建成;苗茂谦;
HU Jiangliang;ZHAO Yong;WANG Jiancheng;MIAO Maoqian;Key Laboratory of Coal Science and Technology,Ministry of Education and Shanxi Province,Taiyuan University of Technology;Shanxi Keling Catalytic Purification Technology Development Co.,Ltd.;

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