煤电超低排放脱硫运行状态及稳定性评估  

Evaluation on Operation Stability of a Flue Gas Desulfurization System After Ultra-low Emission Retrofit of the Coal-fired Unit

作　　者：滕卫明 李清毅 郑成航[3] 胡达清 范海东 李立 高翔[3] 

机构地区：[1]浙江省能源集团有限公司,杭州310007 [2]浙江天地环保科技有限公司,杭州310003 [3]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《动力工程学报》2017年第12期992-998,共7页Journal of Chinese Society of Power Engineering

基　　金：国家杰出青年科学基金资助项目(51125025);浙江省重点科技创新团队资助项目(2011R50017);浙江省重大科技专项重点社会发展资助项目(2013C03022)

摘　　要：以实施超低排放改造后的某1 000 MW燃煤机组为例,从机组负荷、入口SO_2质量浓度、出口SO_2质量浓度、脱硫效率、浆液pH值等之间的相互关系及系统物耗、能耗入手,建立该机组脱硫装置的性能评估体系,对脱硫装置的运行状态、可靠性和稳定性进行详尽评估.结果表明:出口SO_2质量浓度与入口SO_2质量浓度具有一定的正相关性;机组负荷增大,出口SO_2质量浓度和脱硫效率均呈稍增长的趋势;浆液pH值维持在5.0~5.6时,出口SO_2质量浓度与浆液pH值具有一定的线性关系;石灰石消耗体积流量与SO_2的排放速率具有线性关系;石膏浆液保持稳定,可满足工艺设计要求;超低排放改造后水耗减少,电耗增加,脱硫塔出口SO_2质量浓度明显降低,其达标率为99.59%;机组总排口SO_2质量浓度稳定可靠,改造效果显著.An evaluation system was established for the desulfurization performance of a 1000 MW coalfired power plant after ultra-low emission retrofit,based on the consumption of material and energy,and the interrelation among the unit load,the inlet and outlet concentration of SO2,the desulfurization efficiency and the slurry pH,etc.,so as to evaluate the running status,reliability and stability of the desulfurization unit in detail.Results show that the outlet concentration of SO2 is positively related to the inlet one.When the pH value of gypsum slurry is kept in 5.0-5.6,there exists a linear correlation between the outlet concentration of SO2 and the pH value.The consumption of limestone has a linear relationship with the emission rate of SO2.The relatively stable content of gypsum slurry is found to be able to meet the requirement of process design.After ultra-low emission retrofit,the water consumption reduces,the power consumption rises,the outlet concentration of SO2 drops significantly,the attainment rate reaches 99.59%,and the SO2 concentration at unit outlet gets stable,indicating obvious effects of the retrofit.

关 键 词：超低排放 脱硫 SO2质量浓度 浆液PH值 

分 类 号：X511[环境科学与工程—环境工程]