密相气力输送系统常见问题及影响因素
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摘要
介绍了单仓泵密相气力输送系统的工艺流程、单仓泵间歇输送的工作原理以及对应的仓泵内压力变化。仓泵工作过程分为进料、流化、输送及吹扫4个阶段,密相气力输送管内流动复杂且不稳定,流型多变,实际运行过程中常出现管道堵塞、部件磨损、下料不畅、出力不足等问题。从系统压力损失计算、固气比选定、仓泵压力上下限值设定、系统选型与布置、压缩气源品质、物料品质、间歇操作、气动阀漏气、料位计故障及压力变送器故障等方面分析了问题产生的原因及影响因素。
The process flow of the dense phase pneumatic conveying system of single bin pump was introduced,combined with its working principle including the four processes of feeding, fluidization, conveying and blowing, and the corresponding pressure change in the bin pump. The flow in dense phase pneumatic conveying pipe is complex and unstable with varying flow pattern. During the actual system running, the problems of pipe clogging,components wearing, unsmooth feeding and insufficient performance occurs frequently. Aiming at these problems, its cause and effect factor were comprehensively analyzed from the aspects of conveying system pressure drop, solid-gas ratio, bin pump maximum and minimum pressure setting, conveying system selection and layout, the quality of compressed air, the product characteristic, batch operation, pneumatic valve leakage and level sensor fault.
The process flow of the dense phase pneumatic conveying system of single bin pump was introduced,combined with its working principle including the four processes of feeding, fluidization, conveying and blowing, and the corresponding pressure change in the bin pump. The flow in dense phase pneumatic conveying pipe is complex and unstable with varying flow pattern. During the actual system running, the problems of pipe clogging,components wearing, unsmooth feeding and insufficient performance occurs frequently. Aiming at these problems, its cause and effect factor were comprehensively analyzed from the aspects of conveying system pressure drop, solid-gas ratio, bin pump maximum and minimum pressure setting, conveying system selection and layout, the quality of compressed air, the product characteristic, batch operation, pneumatic valve leakage and level sensor fault.
引文
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[17] 吴晓.栓流密相气力输送能耗特性的试验研究[J].硫磷设计与粉体工程,2008(6):8-11. WU X. Experimental study on energy consumption characteristics of plug flow dense phase pneumatic conveying[J].Sulphur phosphorus & bulk materials handling related engineering,2008(6):8-11.
[18] 姜梅,高世刚,李炜.电厂输灰系统调试期间堵管原因分析及应对措施[J].电力建设,2011,32(5):84-87. JIANG M,GAO S G,LI W. Analysis and treatment about pipe blockage of ash-conveying system during the period of adjustment and test in power plant[J].Electric power construction, 2011,32(5):84-87.
[19] 黄南生.正压浓相气力输灰系统堵管原因及处理方法[J].电力安全技术,2002(11):16-18. HUANG N S. Cause and treatment of plugging in dense phase pneumatic conveying system with positive pressure[J].Electric safety technology,2002(11):16-18.
[20] 邱生祥.火电厂气力除灰不畅的原因分析及解决对策[J].电力建设,2011,32(4):70-73. QIU S X. Analysis and solutions for clogging problems of pneumatic ash removal system[J].Electric power construction,2011,32(4):70-73.
[21] 郝云冯,胡玲玲.正压浓相气力输灰系统故障原因分析及处理对策[J].能源与环境,2014(2):19-20,22. HAO Y F,HU L L. Fault analysis and treatment measures of pneumatic dense phase ash conveying system with positive pressure[J]. Energy and environment,2014(2):19-20,22.
[2] 许东.浓相气力输送技术在物料输送上的应用[J].山东化工,2012,41(2):54-57. XU D. Application of dense phase pneumatic conveying technology in material transportation[J].Shandong chemical industry,2012,41(2):54-57.
[3] 马克毅,付书红.氧化铝浓相输送技术[J].昆明理工大学学报(理工版),2003,28(5):28-31.MA K Y,FU S H. Technology of aluminum oxide dense-phase transport[J].Journal of Kunming university of science and technology(Science and technology),2003,28(5):28-31.
[4] 郑祥玉,徐尧.气力输送工艺在煤粉输送中的应用[J].洁净煤技术,2015,21(2):85-88.ZHENG X Y,XU Y. Application of pneumatic conveying technology in pulverized coal conveying[J].Clean coal technology,2015,21(2):85-88.
[5] 张鑫.2种粉体气力输送系统的对比选型[J].中国粉体技术,2015,21(3):100-102. ZHANG X. Analysis and selection of two kinds of pneumatic conveying system[J].China powder science and technology,2015,21(3):100-102.
[6] 李勇,张俊岭,高天宝.密相气力输送物料流动状态分析及供料装置的选用[J].水泥工程,2007(2):47-50.LI Y,ZHANG J L,GAO T B. Material flow state in dense phase pneumatic conveying process and selection of the feeding device[J]. Cement engineering,2007(2):47-50.
[7] 赵峥,李文平.浓相正压气力输送流动特性研究和系统选择[J].中国电力,2007,40(11):78-81. ZHAO Z,LI W P. Research on flow characteristics of positive dense phase pneumatic conveyance and system selection[J].Electric power,2007,40(11):78-81.
[8] 董卫宾,郭晓镭,龚欣,等.上出料系统粉煤密相气力输送特性及其与下出料系统的比较[J].化工学报,2011,62(7):1989-1997. DONG W B,GUO X L,GONG X,et al. Characteristic of top discharge blow tank conveying system and comparison with bottom discharge blow tank conveying system[J]. CIESC journal,2011,62(7):1989-1997.
[9] 贺春辉,陈先梅,倪红亮,等.发送罐出料方式对煤粉高压密相气力输送特性的影响[J].中国电机工程学报,2012,32(23):32-39. HE C H,CHEN X M,NI H L,et al. Influences of discharge types of blow tank on dense phase pneumatic conveying of pulverized coal at high pressure[J]. Proceedings of the Chinese society for electrical engineering,2012,32(23):32-39.
[10] 肖艳军,孙英培,李永聪,等.双泵式粉煤灰恒压输送系统的研究与应用[J].煤炭工程,2014,46(7):121-123. XIAO Y J,SUN Y P,LI Y C,et al. Study and application of double pump type fly ash constant pressure pumping system[J].Coal engineering,2014,46(7):121-123.
[11] 程慧星,龚欣,郭晓镭,等.料仓中粉体流动数学模型分析[J].化学工程,2005,33(3):33-35,42. CHENG H X,GONG X,GUO X L,et al. Mathematic model analysis of powder flow in hopper[J].Chemical engineering(China),2005,33(3):33-35,42.
[12] 王锟,潘洪利,刘宗明.浓相气力输送分支管道分流特性的数值模拟[J].济南大学学报(自然科学版),2013,27(3):303-308. WANG K,PAN H L,LIU Z M. Numerical simulation on dense phase pneumatic conveying diversion characteristics in branch pipeline[J]. Journal of university of Jinan (Science and technology),2013,27(3):303-308.
[13] 刘强,段广彬,王勇,等.上引流态化气力输送仓泵发料过程的数值模拟[J].济南大学学报(自然科学版),2013,27(3):298-302. LIU Q,DUAN G B,WANG Y,et al. Numerical simulation of sending process of upward fluidization silo pump in pneumatic conveying[J]. Journal of university of Jinan(Science and technology),2013,27(3):298-302.
[14] 林卫全,丁昊,张汝刚.高炉煤气干法除尘气体输灰系统问题及处理[J].冶金动力,2010(2):24-25,28.LIN W Q,DING H,ZHANG R G. Problems and disposal method of dust pneumatic conveyance system of blast furnace gas by dry dedusting process[J].Metallurgical power,2010(2):24-25,28.
[15] 宋凤莲.浓相正压流态化仓泵气力除灰系统计算模型[J].中国电力,2011,44(4):59-62. SONG F L. A computational model of ash removal process for dense phase pneumatic pump conveying[J].Electric power,2011,44(4):59-62.
[16] 姬春彦,王国兴,郭敏,等.粉体长距离气力输送研究现状[J].矿山机械,2015,43(1):58-84. JI C Y,WANG G X,GUO M,et al. Research status on long-distance powder pneumatic conveyance[J].Mining & processing equipment,2015,43(1):58-84.
[17] 吴晓.栓流密相气力输送能耗特性的试验研究[J].硫磷设计与粉体工程,2008(6):8-11. WU X. Experimental study on energy consumption characteristics of plug flow dense phase pneumatic conveying[J].Sulphur phosphorus & bulk materials handling related engineering,2008(6):8-11.
[18] 姜梅,高世刚,李炜.电厂输灰系统调试期间堵管原因分析及应对措施[J].电力建设,2011,32(5):84-87. JIANG M,GAO S G,LI W. Analysis and treatment about pipe blockage of ash-conveying system during the period of adjustment and test in power plant[J].Electric power construction, 2011,32(5):84-87.
[19] 黄南生.正压浓相气力输灰系统堵管原因及处理方法[J].电力安全技术,2002(11):16-18. HUANG N S. Cause and treatment of plugging in dense phase pneumatic conveying system with positive pressure[J].Electric safety technology,2002(11):16-18.
[20] 邱生祥.火电厂气力除灰不畅的原因分析及解决对策[J].电力建设,2011,32(4):70-73. QIU S X. Analysis and solutions for clogging problems of pneumatic ash removal system[J].Electric power construction,2011,32(4):70-73.
[21] 郝云冯,胡玲玲.正压浓相气力输灰系统故障原因分析及处理对策[J].能源与环境,2014(2):19-20,22. HAO Y F,HU L L. Fault analysis and treatment measures of pneumatic dense phase ash conveying system with positive pressure[J]. Energy and environment,2014(2):19-20,22.