摘要
国内大量在役300 MW循环流化床(CFB)锅炉床温偏差大、存在局部高温点,烟气SO2和NOx的原始排放质量浓度较高,这给CFB锅炉的节能降耗和超低排放带来了困难。分析认为其主要因分离器流量偏差和效率偏差造成的循环回路循环量和炉膛物料浓度存在差异所致。对此,通过分离器入口烟道改造和中心筒改型使床温偏差得以消除,炉膛平均床温降幅达35℃以上,脱硫剂消耗量降低40%,脱硝尿素消耗量下降20%。该结果可为改善CFB锅炉运行环保经济性及设计优化提供参考。
In China, several problems occur in large number of 300 MW unit CFB boilers, such as large bed temperature deviations, existence of local high temperature points and relatively high original emission con- centration of SO2 and NOx,which brings difficulties in energy saving, cost reducing and ultraqow emission of the CFB boilers. Analysis shows that, the deviations of separator flow and efficiency result in deviations between the circulation volume and the material concentration in the circulation loop, thus bring the temperature deviation at both sides and middle part of the bed. The temperature deviation can be avoided by retrofitting the separator inlet gas flue and cyclone vortex,which would contribute to a more even coal supply. After transformation, the average bed temperature decreased by more than 35 ℃ , and the consumptions of the desulfurizer and denitration urea are reduced by 40 % and 20 %, respectively.
出处
《热力发电》
CAS
北大核心
2016年第11期68-74,共7页
Thermal Power Generation
基金
北京市优秀人才培养资助项目(20140000204400001)
中国电机工程学会青年人才托举工程(JLB-2016-59)
关键词
CFB锅炉
床温
旋风分离器
流量偏差
效率偏差
脱硫剂
节能
超低减排
CFB boiler, bed temperature, cyclone separator, flow deviation, separation efficiency deviation, desulfurizer, energy saving, ultra low emission
