碎煤热解半焦干熄焦工艺的研究与开发
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摘要
针对碎煤热解半焦粒度小、床层阻力大、换热能效低等问题,提出并设计了一套适合碎煤热解半焦的干熄焦工艺,该熄焦工艺采用高温半焦薄层直接接触换热方式,可实现冷却介质循环利用、半焦余热高效回收等。针对干熄焦过程中气焦比、床层压降、熄焦时间、热量回收等核心问题进行了理论计算,结果表明,所设计的碎煤热解半焦干熄焦工艺气焦比为1.28 m3/kg,床层压降为268 Pa,熄焦时间为0.68 h,吨焦可回收热量446 MJ以上。
Aiming at the problems of small particle size of crushed coal pyrolysis semi-coke,large resistance of semicoke bed and low heat transfer efficiency,one dry quenching process suitable for crushed coal pyrolysis semi-coke was proposed and designed.The dry quenching process adopted a direct contact and heat exchange method of high-temperature thin semi-coke layer,which could realize recycling of cooling medium and efficient waste heat recovery of semi-coke.Theoretical calculations were carried out on core issues such as gas-to-coke ratio,pressure drop of the bed,dry quenching time and heat recovery.The results showed that the designed semi-coke dry quenching process had a gas-to-coke ratio of1.28 m3/kg,bed pressure drop of 268 Pa,dry quenching time of 0.68 h and per ton coke heat recovery of 446 MJ or more.
Aiming at the problems of small particle size of crushed coal pyrolysis semi-coke,large resistance of semicoke bed and low heat transfer efficiency,one dry quenching process suitable for crushed coal pyrolysis semi-coke was proposed and designed.The dry quenching process adopted a direct contact and heat exchange method of high-temperature thin semi-coke layer,which could realize recycling of cooling medium and efficient waste heat recovery of semi-coke.Theoretical calculations were carried out on core issues such as gas-to-coke ratio,pressure drop of the bed,dry quenching time and heat recovery.The results showed that the designed semi-coke dry quenching process had a gas-to-coke ratio of1.28 m3/kg,bed pressure drop of 268 Pa,dry quenching time of 0.68 h and per ton coke heat recovery of 446 MJ or more.
引文
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[11]孔宁,温治,冯俊小,等.干熄炉内流动和传热过程数学模型的研究现状及其发展趋势[J].工业加热,2003,32(5):1-6.KONG N,WEN Z,FENG J X,et al.Research Status and Development Trend of the Mathematical Model for Fluid Flow and Heat Transfer Process in the CDQUnit[J].Industrial Heating,2003,32(5):1-6.
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[2]李初福,门卓武,王向辉,等.一种碎煤热解和干熄焦的方法及装置:201410378385.5[P].2014-11-19.
[3]宋东升,林发现,宋自力,等.用于半焦干熄焦的换热装置:201721107755.7[P].2018-05-08.
[4]张朝环,陈爱国.一种新型的半焦冷却器设计[J].煤炭科学技术,2016(4):118-120.
[5]李惠娟,赵俊学,李小明,等.以干馏煤气为介质的半焦干熄焦技术研究[J].煤炭转化,2011,34(1):29-33.LI H J,ZHAO J X,LI X M,et al.Technology Research of Pyrogenous Coal Gas Used as Semi-coke Quenching Medium[J].Coal Conversion,2011,34(1):29-33.
[6]张智芳,张秦龙,宋恒.一种熄焦炉及隧道式半焦干熄焦系统:201710592239.6[P].2017-07-19.
[7]ZHAO J X,LI H J,LI X M,et al.Simulation Calculation of Semi-coke Dry Quenching with Recycled Carbonization Gas[C]//International Conference on Materials for Renewable Energy&Environment.2011:1 534-1 537.
[8]赵俊学,马成,邹冲,等.一种内热式中低温干馏和干熄焦热态模拟装置及方法:201711072098.1[P].2017-11-03.
[9]陈静升,贾培军.煤热解半焦特性及其钝化工艺初步设想[J].煤化工,2017,45(5):25-29.CHEN J S,JIA P J.Characteristics of Semi-coke from Coal Pyrolysis and Preliminary Ideas of Its Passivating Process[J].Coal Chemical Industry,2017,45(5):25-29.
[10]李庆奎,郭锐.干熄焦焦炭烧损率与吨焦产汽量分析[J].燃料与化工,2015,46(1):25-27.LI Q K,GUO R.Relationship Between CDQ Coke Burning Rate and Steam Generation per Ton Coke[J].Fuel&Chemical Processes,2015,46(1):25-27.
[11]孔宁,温治,冯俊小,等.干熄炉内流动和传热过程数学模型的研究现状及其发展趋势[J].工业加热,2003,32(5):1-6.KONG N,WEN Z,FENG J X,et al.Research Status and Development Trend of the Mathematical Model for Fluid Flow and Heat Transfer Process in the CDQUnit[J].Industrial Heating,2003,32(5):1-6.
[12]潘立慧,魏松波.干熄焦技术[M].北京:冶金工业出版社,2005:251-277.