一种新的酸露点计算式及其现场实验验证
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摘要
烟气酸露点是制约深度余热回收技术的重要因素,准确预测该数值对避免低温腐蚀、降低排烟热损失及提高锅炉效率有重要意义。在对几种常用酸露点计算式分析比较的基础上,采用最小二乘法对相关实验数据进行拟合后得到拟合式,通过理论计算及近年来相关学者现场测量数据对相关公式进行对照分析,并使用自行设计的酸露点测量装置对本文提出的计算式的计算数值进行了验证。结果表明,本文提出的计算式计算数值分布范围更加合理,当SO3体积分数低于20 mL/m3时具有更高的计算精度。
The acid dew point of flue gas is an important factor that restricts deep waste heat recovery technology.Accurate prediction of this value is of great significance for avoiding low temperature corrosion, reducing heat loss of flue gas and improving boiler efficiency. Based on the analysis and comparison of common calculation formulas of acid dew point, the least square method is used to fit the relevant experimental data to obtain the fitted formula, which is analyzed through theoretical calculation and field measurement data of relevant scholars in recent years. The calculation results of the formula proposed in this paper are verified by using self-designed measurement device of acid dew point. The result shows that the formula proposed in this paper not only has a more reasonable range of numerical prediction, but also has higher accuracy than others when the volume fraction of SO3 is below 20 mL/m3.
The acid dew point of flue gas is an important factor that restricts deep waste heat recovery technology.Accurate prediction of this value is of great significance for avoiding low temperature corrosion, reducing heat loss of flue gas and improving boiler efficiency. Based on the analysis and comparison of common calculation formulas of acid dew point, the least square method is used to fit the relevant experimental data to obtain the fitted formula, which is analyzed through theoretical calculation and field measurement data of relevant scholars in recent years. The calculation results of the formula proposed in this paper are verified by using self-designed measurement device of acid dew point. The result shows that the formula proposed in this paper not only has a more reasonable range of numerical prediction, but also has higher accuracy than others when the volume fraction of SO3 is below 20 mL/m3.
引文
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[17]许加庆.电站锅炉烟气余热利用与低温腐蚀防治研究[D].北京:华北电力大学,2015:34-39.XU Jiaqing.Study on waste heat utilization and low temperature corrosion prevention of power station boilers[D].Beijing:North China Electric Power University,2015:34-39.
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[20]李钧,阎维平,高宝桐,等.电站锅炉烟气酸露点温度的计算[J].锅炉技术,2009,40(5):14-17.LI Jun,YAN Weiping,GAO Baotong,et al.Calculation of acid dew point temperature of power plant boiler[J].Boiler Technology,2009,40(5):14-17.
[21]唐志永.湿法脱硫后燃煤电站尾部装置腐蚀研究[D].南京:东南大学,2006:35-44.TANG Zhiyong.Study on corrosion of tailing device of coal-fired power station after wet desulfurization[D].Nanjing:Southeast University,2006:35-44.
[22]WILHELM G.Kurzes handbuch der brennstoff:und feuerungstechnik[M].Springer-Verlag,1962:35.
[23]向柏祥,邢文崇,李健峰,等.烟气酸露点的测量与计算关联式的修正[J].锅炉技术,2014,45(1):1-4.XIANG Baixiang,XING Wenchong,LI Jianfeng,et al.Correlation between measurement and calculation of flue gas acid dew point[J].Boiler Technology,2014,45(1):1-4.
[2]李飞.燃煤锅炉烟气含酸灰粒沉积特性与工程酸露点研究[D].济南:山东大学,2014:1-2.LI Fei.Study on acid deposition characteristics and engineering acid dew point of flue gas from coal-fired boilers[D].Ji’nan:Shandong University,2014:1-2.
[3]赵之军,冯伟忠,张玲,等.电站锅炉排烟余热回收的理论分析与工程实践[J].动力工程学报,2009,29(11):994-997.ZHAO Zhijun,FENG Weizhong,ZHANG Ling,et al.Theoretical analysis and engineering practice of waste heat recovery from power plant boilers[J].Journal of Power Engineering,2009,29(11):994-997.
[4]王志军,熊源泉.两级循环蒸发ORC系统深度回收燃煤锅炉烟气余热的研究[J].动力工程学报,2017,37(1):66-72.WANG Zhijun,XIONG Yuanquan.Study on deep recovery of waste heat of flue gas from coal-fired boiler by two-stage circulating evaporation ORC system[J].Journal of Power Engineering,2017,37(1):66-72.
[5]LIU S,BI D,ZHENG F,et al.Experiment on thermoelectric power generation system of boiler waste heat recovery based on semiconductor[J].Agricultural Equipment&Vehicle Engineering,2017,55(5):1-4.
[6]马有福,杨丽娟,吕俊复.电站锅炉尾部烟气余热利用系统技术经济性比较[J].动力工程学报,2017,37(4):321-328.MA Youfu,YANG Lijuan,LüJunfu.Technical and economic comparison of flue gas waste heat recovery system in power plant boiler[J].Journal of Power Engineering,2017,37(4):321-328.
[7]WANG C,HE B,SUN S,et al.Application of a low pressure economizer for waste heat recovery from the exhaust flue gas in a 600 MW power plant[J].Energy,2012,48(1):196-202.
[8]朱建跃,张锡奇,曹绛敏,等.基于酸露点检测的烟气余热回收工程改造实践[J].锅炉技术,2017,48(6):55-59.ZHU Jianyue,ZHANG Xiqi,CAO Jiangmin,et al.Reconstruction practice of flue gas waste heat recovery project based on acid dew point detection[J].Boiler Technology,2017,48(6):55-59.
[9]陈辉,黄启龙,戴维葆,等.660 MW超临界煤粉锅炉空气预热器堵灰及解决措施分析[J].锅炉技术,2017,48(6):63-66.CHEN Hui,HUANG Qilong,DAI Weibao,et al.Analysis of ash blocking and solution for 660 MWsupercritical pulverized coal boiler air preheater[J].Boiler Technology,2017,48(6):63-66.
[10]ZARENEZHAD B,AMINIAN A.Accurate prediction of the dew points of acidic combustion gases by using an artificial neural network model[J].Energy Conversion&Management,2011,52(2):911-916.
[11]CIUKAJ S,PRONOBIS M.Dew point of the flue gas of boilers co-firing biomass with coal[J].Chemical&Process Engineering,2013,34(1):101-108.
[12]XIANG B,TANG B,WU Y,et al.Predicting acid dew point with a semi-empirical model[J].Applied Thermal Engineering,2016,106:992-1001.
[13]WEI W,SUN F,SHI Y,et al.Theoretical prediction of acid dew point and safe operating temperature of heat exchangers for coal-fired power plants[J].Applied Thermal Engineering,2017,123:782-790.
[14]宋杰.电站锅炉低温省煤器换热特性数值模拟及低温腐蚀研究[D].北京:华北电力大学,2016:15-23.SONG Jie.Numerical simulation of heat transfer characteristics and low temperature corrosion of low temperature economizer in power station boilers[D].Beijing:North China Electric Power University,2016:15-23.
[15]XIANG B,ZHANG M,YANG H,et al.Prediction of acid dew point in flue gas of boilers burning fossil fuels[J].Energy&Fuels,2016,30(4):3365-3373.
[16]李加护,任忠强,方立军,等.烟气酸露点估算方法[J].热力发电,2018,47(3):56-61.LI Jiahu,REN Zhongqiang,FANG Lijun,et al.Flue gas acid dew point estimation method[J].Thermal Power Generation,2018,47(3):56-61.
[17]许加庆.电站锅炉烟气余热利用与低温腐蚀防治研究[D].北京:华北电力大学,2015:34-39.XU Jiaqing.Study on waste heat utilization and low temperature corrosion prevention of power station boilers[D].Beijing:North China Electric Power University,2015:34-39.
[18]LI X,WU Z,ZHANG L,et al.An updated acid dew point temperature estimation method for air-firing and oxy-fuel combustion processes[J].Fuel Processing Technology,2016,154:204-209.
[19]张建中.烟气酸露点计算方法研究中一些误区和疑点的辨析和讨论[J].锅炉技术,2013,44(2):10-16.ZHANG Jianzhong.Discrimination and discussion of some misunderstandings and doubtful points in the study of calculation methods of flue gas acid dew point[J].Boiler Technology,2013,44(2):10-16.
[20]李钧,阎维平,高宝桐,等.电站锅炉烟气酸露点温度的计算[J].锅炉技术,2009,40(5):14-17.LI Jun,YAN Weiping,GAO Baotong,et al.Calculation of acid dew point temperature of power plant boiler[J].Boiler Technology,2009,40(5):14-17.
[21]唐志永.湿法脱硫后燃煤电站尾部装置腐蚀研究[D].南京:东南大学,2006:35-44.TANG Zhiyong.Study on corrosion of tailing device of coal-fired power station after wet desulfurization[D].Nanjing:Southeast University,2006:35-44.
[22]WILHELM G.Kurzes handbuch der brennstoff:und feuerungstechnik[M].Springer-Verlag,1962:35.
[23]向柏祥,邢文崇,李健峰,等.烟气酸露点的测量与计算关联式的修正[J].锅炉技术,2014,45(1):1-4.XIANG Baixiang,XING Wenchong,LI Jianfeng,et al.Correlation between measurement and calculation of flue gas acid dew point[J].Boiler Technology,2014,45(1):1-4.