洁净煤技术

2020, v.26;No.130(06) 109-117

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燃煤电厂白色烟羽消除技术现状与展望
Current status and prospect of white moist plume elimination technology in coal-fired power plants

杨晓阳;王飞;杨凤玲;张缠保;程芳琴;
YANG Xiaoyang;WANG Fei;YANG Fengling;ZHANG Chanbao;CHENG Fangqin;Collaborative Innovation Center of High Value-Added Utilization of Coal-related Wastes,State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources,Shanxi University;Shanxi HuaRenTong Electric Power Technology Co.,Ltd.;

摘要(Abstract):

随着我国环保政策愈发完善和严格,电厂湿法脱硫后饱和湿烟气排入大气形成的"白色烟羽"治理需求增加。通过对白色烟羽形成与消除机理的研究,分析了目前燃煤电厂消除白色烟羽技术的优缺点及应用前景。国内外现有的消白技术主要包括烟气冷却、烟气加热、冷凝复热、旋流除湿、溶液除湿、膜法除湿等。烟气冷却、烟气加热、冷凝复热技术均通过直接/间接换热,改变烟气在出口处的状态实现消白,技术相对成熟,且已在工程实例中应用,但能耗大,对换热设备防腐要求较高,并且GGH成本高、能耗大;旋流除湿技术虽然负荷大、压降低和结构简单,但消白效果有限;溶液除湿与膜法除湿技术目前还处于试验研究阶段,由于自身技术缺陷,鲜见应用于燃煤电厂的湿烟气处理工艺中。烟气瞬间加压凝结消白技术利用流场结构瞬间提高水蒸汽分压,从而使其液化,同时蒸汽凝结液化释放大量潜热,提高了烟气出口温度,烟气除湿与加热协同作用最终保障饱和湿烟气消白。讨论和对比了各治理技术的特点和适应性,并结合试验,发现烟气瞬间加压凝结消白技术可有效回收湿烟气中的水蒸汽,且在蒸汽凝结过程中饱和蒸汽内携带的细颗粒等污染物作为凝结核被凝结液滴协同脱除,同时无需其他换热设备,降低了能耗,是烟气消白技术中的潜力技术之一。
With the increasingly complete and strict environmental protection policies in China,the demand for the treatment of " white plumes" formed by the saturated wet flue gas discharged into the atmosphere after wet desulfurization in power plants has increased.Through the research on the formation and elimination mechanism of white plume,the advantages,disadvantages and application prospects of the current technology for eliminating white plume in coal-fired power plants were analyzed. The existing technologies for eliminating white moist plume at home and abroad mainly include flue gas condensation,flue gas heating,condensation reheating,swirling dehumidification,solution absorption,and membrane separation.All of the flue gas cooling,flue gas heating,and condensation reheating technologies use direct/indirect heat exchange to change the state of flue gas at the outlet to achieve whitening.The technology is relatively mature and has been applied in engineering,but it has high energy consumption and high anti-corrosion requirements of heat exchange equipment;GGH has high cost and high energy consumption.Although the cyclone dehumidification technology has a large load,pressure reduction and simple structure,its whitening effect is limited; The technology of solution dehumidification and membrane separation is still in the experimental research stage at present,and it has not been used in the wet flue gas treatment process of coal-fired power plants due to its own technical defects.Instantaneous pressure condensation dehumidification technology of flue gas uses the flow field structure to instantly increase the partial pressure of water vapor,so as to make it liquefied.At the same time,steam condensation and liquefaction will release a lot of latent heat,which can improve the flue gas outlet temperature.The synergistic effect of flue gas dehumidification and heating finally ensures the saturation of wet flue gas white.In this paper,the characteristics and adaptability of various treatment technologies were discussed and compared. Combined with experiments,it is found that the instantaneous pressurized condensation and whitening technology of flue gas can effectively recover the water vapor in the wet flue gas.The fine particles and other pollutants in the saturated steam are removed as condensation nuclei by the condensation droplets during the steam condensation process. At the same time,other heat exchange equipment is not needed,which reduces energy consumption.It is one of the potential technologies in the flue gas whitening technology.

关键词(KeyWords): 湿法脱硫;白色烟羽;饱和湿烟气;加压凝结;细颗粒污染物
wet desulfurization;white moist plume;saturated wet flue gas;pressurized condensation;fine particle contaminant

Abstract:

Keywords:

基金项目(Foundation): 山西省科技重大专项资助项目(20181102010);; 襄垣县固废综合利用科技攻关项目(2018XYSDYY-13)

作者(Author): 杨晓阳;王飞;杨凤玲;张缠保;程芳琴;
YANG Xiaoyang;WANG Fei;YANG Fengling;ZHANG Chanbao;CHENG Fangqin;Collaborative Innovation Center of High Value-Added Utilization of Coal-related Wastes,State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources,Shanxi University;Shanxi HuaRenTong Electric Power Technology Co.,Ltd.;

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DOI: 10.13226/j.issn.1006-6772.19110606

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