环保新标准的循环流化床锅炉改造分析  

Reforming Analysis of Environmental Protection Technologies in Circulating Fluidized Bed Boiler

作　　者：马双忱[1] 张华仙 朱思洁[1] 雷雨[1] 杨静[1] 

机构地区：[1]华北电力大学环境科学与工程学院,河北保定071003 [2]山西省电力勘测设计院光华分公司,山西太原030001

出　　处：《电力科学与工程》2015年第4期66-72,共7页Electric Power Science and Engineering

基　　金：国家自然科学基金(50976035)

摘　　要：对循环流化床在脱硝、脱硫和除尘等方面环保技术路线进行了分析,权衡各项技术的利弊及经济因素,结合新颁布的火电厂大气污染物排放标准(GB 13223—2011),做出如下建议:半干旋转喷雾法脱硫工艺(SDA)和SCR结合使用后,氮氧化物的脱除效率可达到95%,循环流化床中高灰分的环境不适合使用SCR,SNCR的脱除效率虽然相对较低,但是通过调整还原剂的停留时间和与烟气的混合程度,脱硝效率可达70%以上,完全可以满足新环保标准的要求;石灰石-石膏湿法脱硫技术成熟,脱硫效率高,负荷适应性好,在循环流化床炉内脱硫的基础上外加该工艺,可以保证足够的脱硫效率;电袋组合式除尘器发挥了两种除尘器的技术优势,可以达到新标准的要求。In this essay, three environmental protection technical routes, denitrification, desulfurization and dust removal of CFB boilers, were analyzed.Considering the advantages and disadvantages of the techniques, economic factors, and with the purpose of meeting the newly issued Power Plant Air Pollutants Emission Standard （GB13223-2011）, this essay suggests the following.The combination of SCR and SDA can increase the NOx removal efficien-cy to 95%.But it does not apply to the environment of high ash content in the circulating fluidized bed.Despite of the low efficiency of the SNCR, denitrification efficiency can be up to 70% with the adjustment of the residence time and the mixing proportion of the flue gas, which can fully meet the new environmental standards.In addition, the limestone-gypsum wet FGD technology, with a high desulfurization efficiency and good load adaptation, is com-paratively mature.If the process is added after circulating fluidized bed desulfurization, adequate removal efficiency can be ensured.The advantages of two kinds of dust remover being considered, the electrostatic bag dust remover can meet the new standards.

关 键 词：循环流化床锅炉 环保特性 改造分析 

分 类 号：X701[环境科学与工程—环境工程]