700 MW燃煤锅炉耦合污泥发电的工程应用  

Engineering application of coal&sludge co-fired power generation on a 700 MW coal-fired boiler

作　　者：叶骥 陈创庭 邹祥波 饶睦敏 魏帅 毛铁英 秦士伟 匡草 陈公达 胡智慧 陈天驰 姜媛 王群 YE Ji;CHEN Chuangting;ZOU Xiangbo;RAO Mumin;WEI Shuai;MAO Tieying;QIN Shiwei;KUANG Cao;CHEN Gongda;HU Zhihui;CHEN Tianchi;JIANG Yuan;WANG Qun(Guangdong Energy Group Science and Technology Research Institute Co.,Ltd.,Guangzhou 510630,China;Guangdong Energy Group Co.,Ltd.,Guangzhou 510000,China;Guangdong Yudean Zhanjiang Biomass Power Co.,Ltd.,Zhanjiang 524300,China;State Key Laboratory for Clean Energy Utilization,Institute for Thermal Power Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]广东能源集团科学技术研究院有限公司,广东广州510630 [2]广东省能源集团有限公司,广东广州510000 [3]广东粤电湛江生物质发电有限公司,广东湛江524300 [4]浙江大学热能工程研究所能源高效清洁利用全国重点实验室,浙江杭州310027

出　　处：《洁净煤技术》2023年第9期61-68,共8页Clean Coal Technology

基　　金：国家重点研发计划资助项目(2021YFF0601001)。

摘　　要：近10 a,国内学者和工程技术人员进行了大量燃煤耦合污泥发电技术相关的学术研究和工程应用,然而大部分研究和应用均在机组70%负荷以上开展,鲜见燃煤耦合污泥发电在碳减排效果方面的相关研究。为掌握燃煤耦合污泥发电技术在机组中低负荷工况下对锅炉的全方位影响规律,在某700 MW四角切圆粉煤锅炉上开展了50%负荷下燃煤耦合生活污泥发电现场工程试验,系统研究了燃煤耦合污泥发电对锅炉热效率、污染物排放、二噁英排放、副产物重金属含量、CO_(2)排放的影响。结果表明:在50%额定负荷下,与不掺烧污泥相比,掺烧3%的污泥使锅炉热效率下降了0.52%,掺烧6%的污泥使锅炉热效率下降1.03%;随污泥掺比上升,炉渣含碳量相应升高,直接导致物理不完全燃烧热损失增加;掺烧污泥对燃煤电厂锅炉粉尘、SO_(2)、NO_(x)等常规污染物排放无明显影响,电厂机组环保设施的处理能力可完全保证掺烧污泥时常规污染物符合超低排放标准;掺烧污泥比例越大,烟气净化装置对二噁英的脱除率相应升高,所有工况的二噁英毒性当量均低于DB 31/1291—2021《燃煤耦合污泥电厂大气污染物排放标准》规定的0.01 ng/m^(3);粉煤灰中的Cr、Cu、Zn,炉渣中的Cr、As、Ba、Ni、Zn,脱硫石膏中Cu对污泥掺烧比例相对敏感,考虑副产物用于土壤改良的情况下,掺烧污泥工况的电厂副产物重金属含量仍符合相关农业标准;通过理论计算,掺烧3%污泥约多排放0.15%的CO_(2),掺烧6%污泥约多排放0.3%的CO_(2),耦合污泥发电技术的应用需在污泥类型、污泥前处理、掺烧负荷、燃烧调整等多方面进行优化,方可实现减污降碳协同增效。In the past 10 years,domestic scholars and engineers have carried out a large number of academic research and engineering applications related to coal-fired coupled sludge power generation technology,but most of the research and application are carried out at more than 70%load of the unit,and there are few rele-vant studies on the carbon emission reduction effect of coal-fired coupled sludge power generation.In order to understand the full range of effects of coal-fired coupled sludge power generation technology on boilers under medium and low load conditions,field engineering tests of coal-fired coupled domestic sludge power generation under 50%load were carried out on a 700 MW quadrangle tangential pulverized coal boiler.The effects of coal-fired coupled sludge power generation on boiler thermal efficiency,pollutant emission,dioxin emission,heavy metal content of by-product and CO_(2)emission were systematically studied.The results show that under 50%rated load,the boiler thermal efficiency decreases by 0.52%with 3%sludge and 1.03%with 6%sludge,compared with that without sludge.With the increase of sludge ratio,the carbon content of slag also increases correspondingly,which directly leads to the increase of heat loss in physical incomplete combustion.The incineration sludge has no significant effect on the discharge of dust,SO_(2),NO_(x)and other conventional pollutants in coal-fired power plants,and the treatment capacity of the environmental protection facilities of the power plant units can fully ensure that the regulated pollutant discharge during the incineration sludge is in line with ultra-low emission standards.The higher the proportion of mixed sludge,the higher the removal rate of dioxins in flue gas purification plant,and the dioxins toxicity equivalent of all operating conditions are lower than 0.01 ng/m^(3)stipulated in DB 31/1291—2021"Emission Standard of Air Pollutants in coal-fired coupled Sludge Power Plant".Cr,Cu,Zn in fly ash,Cr,As,Ba,Ni,Zn in slag,and Cu in desulfurized gypsum are relative

关 键 词：污泥 耦合发电 锅炉热效率 二噁英 CO_(2)排放 

分 类 号：TQ53[化学工程—煤化学工程] TK114[动力工程及工程热物理—热能工程]