燃煤烟气湿法脱硫系统模型及优化运行  

Modeling and Operation Optimization of Wet Flue Gas Desulfurization Systems

作　　者：郝润龙[1] 赵毅[1] 郭天祥[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

出　　处：《动力工程学报》2016年第10期822-826,841,共6页Journal of Chinese Society of Power Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2013AA065403);中央高校基本科研业务费资助项目(2015ZZD07);北京市重大科技成果转化培育基金资助项目(Z151100002815012);国家科技支撑计划资助项目(2014BAC23B04-06)

摘　　要：针对湿式石灰石-石膏法脱硫工艺能耗偏高的缺陷,通过研究气-气换热器(GGH)、除雾器、增压风机、循环浆液泵和氧化风机等设备运行情况,并结合流体力学基本原理,推导出增压风机、氧化风机和循环浆液泵的数学模型.以某600 MW燃煤电厂脱硫系统为例,得出了脱硫系统阻塞率与GGH压差和除雾器压差的特征曲线,以及总阻力系数与GGH阻塞率和除雾器阻塞率的关系.结果表明:当阻塞率>0.3时,GGH和除雾器需进行吹扫,同时在运行过程中也要保证总阻力系数<0.003;循环浆液泵的优化组合可实现脱硫系统节能降耗和增压风机的优化运行;根据SO2质量浓度和烟气量变化来优化氧化风机出力,亦可促进脱硫系统的优化运行.To solve the problem of high energy consumption existing in wet limestone-gypsum desulfuriza- tion process, mathematical models were set up for the booster fan, slurry circulating pump and oxidation fan by studying the working conditions of the gas-gas heater （GGH）, demister, booster fan, slurry circu lating pump and oxidation fan, etc. , and based on the theory of fluid mechanics. With these models, char- acteristic curves between the differential pressure of GGH/demister and the system blocking rate were got for the desulfurization system in a certain 600 MW coal-fired power plant, while relations between the total resistance coefficient and the blocking rate of GGH/demister were obtained. Results show that when the blocking rate is over 0. 3, the GGH and demister should be swept, and the total resistance coefficient should be kept below 0. 003 during operation. Through optimal combination of slurry circulating pumps, energy saving of the wet flue gas desulfurization （WFGD） system and operation optimization of the booster fan could be realized; the operation optimization of WFGD system could also be achieved by optimizing the oxidation fan according to the variation of SO2 mass concentration and flue gas flow.

关 键 词：湿法烟气脱硫 数学模型 能耗分析 优化运行 

分 类 号：X701.3[环境科学与工程—环境工程]