CFB锅炉燃煤自脱硫试验与石灰石脱硫计算参数分析  

Coal-fired self-desulfurization test and limestone desulfurization calculation parameter analysis for CFB boiler

作　　者：金森旺[1] 赵鹏勃 时正海 孙献斌 高洪培 王海涛 黄中 韩应 刘海峰 JIN Senwang;ZHAO Pengbo;SHI Zhenghai;SUN Xianbin;GAO Hongpei;WANG Haitao;HUANG Zhong;HAN Ying;LIU Haifeng(China Huaneng Group Clean Energy Technology Research Institute,Beijing 102209,China;Xi’an Xire Boiler and Environmental Protection Engineering Co.,Ltd.,Xi’an 710054,China;Huaneng Yangtze Environmental Technology Co.,Ltd.,Beijing 100031,China;China Huaneng Group Co.,Ltd.,Beijing 100031,China)

机构地区：[1]中国华能集团清洁能源技术研究院有限公司,北京102209 [2]西安西热锅炉环保工程有限公司,陕西西安710054 [3]华能长江环保科技有限公司,北京100031 [4]中国华能集团有限公司,北京100031

出　　处：《热力发电》2021年第11期115-121,共7页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ20-H62)。

摘　　要：为了研究燃煤循环流化床(CFB)锅炉自脱硫效应对于石灰石脱硫计算参数的影响,在1 MW CFB试验台对2个煤种进行了自脱硫试验。结果表明:2个试验煤种自脱硫效率分别为73.5%和57.3%,其差异主要与煤的可燃硫含量、煤中CaO等金属氧化物含量及锅炉运行参数有关;根据SO_(2)排放值修正的燃料硫分计算钙硫摩尔比是按照收到基全硫计算值的3.78倍;随着石灰石添加量的增加,脱硫效率偏差由20.06%逐渐减小至10.65%;根据SO_(2)排放值修正燃料硫分计算的脱硫热损失均为正值,按照收到基全硫计算的脱硫热损失均为负值,其偏差原因在于后者将入炉煤自脱硫的固硫反应放热量计入了石灰石脱硫反应放热量中;CFB锅炉由于燃煤自脱硫效应的影响,按照收到基全硫计算脱硫热损失会出现较大的计算误差,而按照SO_(2)实际排放值计算脱硫热损失更符合实际。In order to study the influence of self-desulfurization effect on calculation parameters of limestone desulfurization in coal-fired circulating fluidized bed(CFB)boiler,an experimental study was carried out on 1 MW CFB test device.The results show that,the self-desulfurization efficiency of the two tested coals was 73.5%and 57.3%,respectively.The difference of self-desulfurization efficiency between the two coals was mainly related to the combustible sulfur content,CaO and other alkali metal oxides content in the coal and boiler operation parameters.The mole ratio of calcium to sulfur calculated by the sulfur content modified according to the SO_(2) emission was 3.78 times of that by the as received basis total sulfur content.With the increase of limestone added,the deviation of desulfurization efficiency gradually reduced from 20.06%to 10.65%.The desulfurization heat losses calculated by the sulfur content of fuel corrected by SO_(2) emission were all positive,while that by the as received basis total sulfur content were all negative.The reason was that the latter included the heat released from the sulfur fixation reaction of self-desulfurization of in-furnace coal into the heat released from limestone desulfurization reaction.Due to the influence of coal-fired self-desulfurization effect on CFB boiler,the calculation error of desulfurization heat loss based on as received basis total sulfur content is large.It is more realistic to calculate the desulfurization heat loss according to the actual emission value of SO_(2).

关 键 词：CFB锅炉 SO_(2) 自脱硫 钙硫摩尔比 脱硫效率 脱硫热损失 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程] X51[环境科学与工程—环境工程]