某电厂脱硫装置脱硫效率影响因素分析.doc

某电厂脱硫效率影响因素分析
张宽友
中电投远达环保工程有限公司,重庆市 401122;
Influencing Factor Analysis for Desulphurization Efficiency of a Certain Power Plant
Zhang Kuanyou
CPI Yuanda Environmental-Protection Engineering Co., Ltd., Chongqing 401122;
摘要: 某电厂脱硫装置运行近十年后,脱硫效率下降,主要为设计煤种改变所致,经过技改后脱硫效率有所提高,达到93℅~95℅。本文就影响脱硫效率的主要因素:发电机功率、氧化空气、吸收塔液位、浆液pH值、烟气温度、喷嘴垂直度等进行分析;建议采取改善浆液池切泡、增加塔内构件改善气液传质等措施进一步提高脱硫效率。
关键词:脱硫效率;影响因素;分析
Abstract:The desulphurization efficiency of FGD plant of a certain power plant descended after near ten-years operation, which was mainly caused by changes of design coal. Through technical retrofit, the efficiency has been improved and reached 93℅~95℅. This thesis focused on analyzing the main influencing factors of the desulphurization efficiency: power of generator, oxidation air, absorber liquid level, slurry pH value, flue gas temperature, nozzle verticality etc.. Measures to improve defoam in slurry tank and to add the absorber internals for improving G/L mass transfer were suggested for increasing the desulphurization efficiency further.
Key words: Desulphurization Efficiency; Influencing Factor; Analysis
1 概述
某电厂脱硫装置采用石灰石湿法脱硫液柱塔技术,一炉一塔配置。单台脱硫装置设计处理能力为对应机组锅炉烟气量的85%,即烟气量915500m3N/H(w),SO23500ppm(w),烟气温度142℃,FGD脱硫效率不低于95%。
原装置设计系统图
原装置工艺流程锅炉引风机后的烟气经换热器降温后进入顺流塔预脱硫,再经U颈进入逆流塔继续脱硫净化,FGD出口烟气经换热器加热后通过增压风机送到烟囱排放。当脱硫装置停运或事故时,FGD装置入口挡板关闭,烟气由旁路烟道排向烟囱。旁路烟道
不设置关断门,烟气量大小通过增压风机导叶开度进行调节。每套脱硫