基于?效率目标的环冷机余热回收系统操作参数优化
|
摘要
针对烧结环冷机余热回收利用率不高的难题,采用?分析法建立了评价某钢铁厂烧结环冷机余热回收系统运行效率的?效率模型。基于多孔介质模型、局部非热平衡方程、真实气体SRK方程建立环冷机内气固两相换热模型。通过CFD仿真模拟,探究料层高度、循环风机输入烟气温度、烧结矿底部入口风速三项可控环冷机运行工艺参数对系统?效率的影响规律。结果表明,料层厚度在1～1.5 m区间每增加0.1 m,?效率增加0.8%～1.1%;循环风温在100～140℃之间每增加10℃,?效率增加1.4%～1.5%;烧结矿底部入口风速在0.9～1.9m/s之间每增加0.1m/s,?效率降低0.18%～0.24%。在此基础上,基于工业运行数据建立?效率正交试验优化模型,提高了该余热回收系统3.42%的?效率。
Aiming at problem of low recovery rate of residual heat of sintering ring cooler,the exergy analysis method was used to establish the exergy efficiency model for evaluating the operating efficiency of the waste heat recovery system of a sintered ring cooler in a steel plant.Based on porous medium model,local non-thermal equilibrium equation and real gas SRK equation,the gas-solid two-phase heat transfer model in the ring cooler was established.Through the CFD simulation,the influence law of the operating parameters of the three controllable ring coolers on the exergy efficiency of the layer height,cooling gas temperature and inlet gas speed were investigated,the results show that the exergy efficiency increases by 0.8%-1.1% for each 0.1 mincrease in layer height from 1 mto 1.5 m,efficiency increases by 1.4%-1.5%for every 10℃increase in gas temperature between 100℃and 140℃and increases by 0.18%-0.24%for every 0.1 m/s increase in gas speed between 0.9 m/s and 1.9 m/s.On this basis,bases on the industrial operation data,the orthogonal experiment optimization model of enthalpy efficiency is established,which improves the exergy efficiency of the residual heat recovery system by 3.42%.
Aiming at problem of low recovery rate of residual heat of sintering ring cooler,the exergy analysis method was used to establish the exergy efficiency model for evaluating the operating efficiency of the waste heat recovery system of a sintered ring cooler in a steel plant.Based on porous medium model,local non-thermal equilibrium equation and real gas SRK equation,the gas-solid two-phase heat transfer model in the ring cooler was established.Through the CFD simulation,the influence law of the operating parameters of the three controllable ring coolers on the exergy efficiency of the layer height,cooling gas temperature and inlet gas speed were investigated,the results show that the exergy efficiency increases by 0.8%-1.1% for each 0.1 mincrease in layer height from 1 mto 1.5 m,efficiency increases by 1.4%-1.5%for every 10℃increase in gas temperature between 100℃and 140℃and increases by 0.18%-0.24%for every 0.1 m/s increase in gas speed between 0.9 m/s and 1.9 m/s.On this basis,bases on the industrial operation data,the orthogonal experiment optimization model of enthalpy efficiency is established,which improves the exergy efficiency of the residual heat recovery system by 3.42%.
引文
[1]郜学,尚海霞.中国钢铁工业“十二五”节能成就和“十三五”展望[J].钢铁,2017,52(7):9.(Yan X,Shang H X.Energy saving achievements of 12th fiveyear program and prospect of 13th five-year program for Chinese steel industry[J].Iron and Steel,2017,52(7):9.)
[2]郭大龙,刘加军.钢铁绿色转型需技术、理念双发展[N/OL].中国冶金报.2015-06-30.http://kns.cnki.net/kcms/detail/detail.aspx?dbname=CCNDTEMP&filename=CYJB20150630 0010&dbcode=CCND.(Guo D L,Liu J J.The green transformation of steel requires the development of technology and philosophy[N/OL].China Metallurgical News.2015-06-30.http://kns.cnki.net/kcms/detail/detail.aspx?dbname=CCNDTEMP&filename=CYJB201506300010&dbcode=CCND.)
[3]王海风,裴元东,张春霞,等.中国钢铁工业烧结/球团工序绿色发展工程科技战略及对策[J].钢铁,2016,51(1):1.(Wang H F,Qi Y D,Zhang C X,et al.Science and technology strategy and countermeasures for green development engineering of sintering/pellet process in China's steel industry[J].Iron and Steel,2016,51(1):1.)
[4]Jang J Y,Chiu Y W.3-d Transient conjugated heat transfer and fluid flow analysis for the cooling process of sintered bed[J].Applied Thermal Engineering,2009,29(14):2895.
[5]Manassaldi J I,Mussati S F,Scenna N J.Optimal synthesis and design of heat recovery steam generation(HRSG)via mathematical programming[J].Energy,2011,36(1):475.
[6]刘传鹏,李国俊,林文佺,等.环冷机余热回收与利用系统的能量分析[J].钢铁,2015,50(12):60.(Liu C P,Li G J,Lin W Q,et al.Energy analysis of the waste heat recovery and utilization system of the ring cooler[J].Iron and Steel,2015,50(12):60.)
[7]张晟,冯军胜,董辉.基于热载体焓为判据的环冷机热工参数仿真优化[J].化工学报,2017,68(11):4129.(Zhang S,Feng J S,Dong H.Simulation and optimization of thermal parameter of sinter annular cooler based on enthalpy exergy of heat carrier[J].CIESC Journal,2017,68(11):4129.)
[8]Liu Y,Yang J,Wang J,et al.Energy and exergy analysis for waste heat cascade utilization in sinter cooling bed[J].Energy,2014,67(4):370.
[9]陈春霞.钢铁生产过程余热资源的回收与利用[D]//沈阳:东北大学,2008.(Chen C X.Recovery of Residual Heat Resources in Steel Production Process[D]//Shenyang:Northeastern University,2008.)
[10]赵凯,吴礼忠,刘文会,等.烧结冷却机换热过程数值模拟与废气温度调控[J].钢铁研究学报,2015,27(7):9.(Zhao K,Wu L Z,Liu W H,et al.Numerical simulation and exhaust gas temperature regulatory in the heat transfer process of sinter cooling machine[J].Journal of Iron and Steel Research,2015,27(7):9.)
[11]刘日新.能量系统的能分析与分析[J].云南冶金,1991(6):46.Liu R X.Energy analysis and exergy analysis of energy system[J].Yunnan Metallurgy,1991(6):46.
[12]李冬庆.烧结冷却机余热发电系统及其关键技术[J].烧结球团,2010,35(6):5.(Li D Q.Sintering cooler waste heat recovery system and its key technologies[J].Sintering and Pelletizing,2010,35(6):5.)
[13]孙用军,董辉,冯军胜,等.烧结-冷却-余热回收系统热力学分析[J].钢铁研究学报,2015.27(1):16.(Sun Y J,Dong H,Feng J S,et al.Thermodynamic analysis of wast heat recovery for sinter-cooling system[J].Journal of Iron and Steel Research,2015,27(1):16.)
[14]夏建芳,喻向阳,赵先琼.基于环冷机冷却能耗最小目标的工艺参数优化[J].钢铁研究学报,2016,28(1):13.(Xia J.Yu X Y.Zhao X Q.Optimization of process parameters based on minimum target of cooling energy consumption of sinter cooler[J].Journal of Iron and Steel Research,2016,28(1):13.)
[15]Hinkley J,Waters A G,Litster J D.An investigation of preignition[J].International Journal of Mineral Processing,1994,42(1/2):37.
[16]Vafai K.Convective flow and heat transfer in variableporosity media[J].Journal of Fluid Mechanics,2006,147(147):233.
[17]Zhang X,Chen Z,Zhang J,et al.Simulation and optimization of waste heat recovery in sinter cooling process[J].Applied Thermal Engineering,2013,54(1):7.
[18]Leong J C,Jin K W,Shiau J S,et al.Effect of sinter layer porosity distribution on flow and temperature fields in a sinter cooler[J].International Journal of Minerals Metallurgy and Materials,2009,16(3):265.
[19]刘伟,范爱武,黄晓明.多孔介质传热传质理论与应用[M].北京:科学出版社,2006.(Liu W,Fan A W,Huang X M.Theory and Application of Heat and Mass Transfer in Porous Media[M].Beijing:Science Press,2006.)
[20]Bird R B,Stewart W E,Lightfoot E N,et al.Transport phenomena[J].John Wiley and Sons Inc,2006,28(2):338.
[21]李林波,曾文斌,朱军,等.CFD数值模拟技术在冶金中的应用[J].钢铁研究学报,2011,23(12):1.(Li L B,Zeng W B,Zhu J,et al.Application of CFD numerical simulation technology in metallurgy[J].Journal of Iron and Steel Research,2011,23(12):1.)
[2]郭大龙,刘加军.钢铁绿色转型需技术、理念双发展[N/OL].中国冶金报.2015-06-30.http://kns.cnki.net/kcms/detail/detail.aspx?dbname=CCNDTEMP&filename=CYJB20150630 0010&dbcode=CCND.(Guo D L,Liu J J.The green transformation of steel requires the development of technology and philosophy[N/OL].China Metallurgical News.2015-06-30.http://kns.cnki.net/kcms/detail/detail.aspx?dbname=CCNDTEMP&filename=CYJB201506300010&dbcode=CCND.)
[3]王海风,裴元东,张春霞,等.中国钢铁工业烧结/球团工序绿色发展工程科技战略及对策[J].钢铁,2016,51(1):1.(Wang H F,Qi Y D,Zhang C X,et al.Science and technology strategy and countermeasures for green development engineering of sintering/pellet process in China's steel industry[J].Iron and Steel,2016,51(1):1.)
[4]Jang J Y,Chiu Y W.3-d Transient conjugated heat transfer and fluid flow analysis for the cooling process of sintered bed[J].Applied Thermal Engineering,2009,29(14):2895.
[5]Manassaldi J I,Mussati S F,Scenna N J.Optimal synthesis and design of heat recovery steam generation(HRSG)via mathematical programming[J].Energy,2011,36(1):475.
[6]刘传鹏,李国俊,林文佺,等.环冷机余热回收与利用系统的能量分析[J].钢铁,2015,50(12):60.(Liu C P,Li G J,Lin W Q,et al.Energy analysis of the waste heat recovery and utilization system of the ring cooler[J].Iron and Steel,2015,50(12):60.)
[7]张晟,冯军胜,董辉.基于热载体焓为判据的环冷机热工参数仿真优化[J].化工学报,2017,68(11):4129.(Zhang S,Feng J S,Dong H.Simulation and optimization of thermal parameter of sinter annular cooler based on enthalpy exergy of heat carrier[J].CIESC Journal,2017,68(11):4129.)
[8]Liu Y,Yang J,Wang J,et al.Energy and exergy analysis for waste heat cascade utilization in sinter cooling bed[J].Energy,2014,67(4):370.
[9]陈春霞.钢铁生产过程余热资源的回收与利用[D]//沈阳:东北大学,2008.(Chen C X.Recovery of Residual Heat Resources in Steel Production Process[D]//Shenyang:Northeastern University,2008.)
[10]赵凯,吴礼忠,刘文会,等.烧结冷却机换热过程数值模拟与废气温度调控[J].钢铁研究学报,2015,27(7):9.(Zhao K,Wu L Z,Liu W H,et al.Numerical simulation and exhaust gas temperature regulatory in the heat transfer process of sinter cooling machine[J].Journal of Iron and Steel Research,2015,27(7):9.)
[11]刘日新.能量系统的能分析与分析[J].云南冶金,1991(6):46.Liu R X.Energy analysis and exergy analysis of energy system[J].Yunnan Metallurgy,1991(6):46.
[12]李冬庆.烧结冷却机余热发电系统及其关键技术[J].烧结球团,2010,35(6):5.(Li D Q.Sintering cooler waste heat recovery system and its key technologies[J].Sintering and Pelletizing,2010,35(6):5.)
[13]孙用军,董辉,冯军胜,等.烧结-冷却-余热回收系统热力学分析[J].钢铁研究学报,2015.27(1):16.(Sun Y J,Dong H,Feng J S,et al.Thermodynamic analysis of wast heat recovery for sinter-cooling system[J].Journal of Iron and Steel Research,2015,27(1):16.)
[14]夏建芳,喻向阳,赵先琼.基于环冷机冷却能耗最小目标的工艺参数优化[J].钢铁研究学报,2016,28(1):13.(Xia J.Yu X Y.Zhao X Q.Optimization of process parameters based on minimum target of cooling energy consumption of sinter cooler[J].Journal of Iron and Steel Research,2016,28(1):13.)
[15]Hinkley J,Waters A G,Litster J D.An investigation of preignition[J].International Journal of Mineral Processing,1994,42(1/2):37.
[16]Vafai K.Convective flow and heat transfer in variableporosity media[J].Journal of Fluid Mechanics,2006,147(147):233.
[17]Zhang X,Chen Z,Zhang J,et al.Simulation and optimization of waste heat recovery in sinter cooling process[J].Applied Thermal Engineering,2013,54(1):7.
[18]Leong J C,Jin K W,Shiau J S,et al.Effect of sinter layer porosity distribution on flow and temperature fields in a sinter cooler[J].International Journal of Minerals Metallurgy and Materials,2009,16(3):265.
[19]刘伟,范爱武,黄晓明.多孔介质传热传质理论与应用[M].北京:科学出版社,2006.(Liu W,Fan A W,Huang X M.Theory and Application of Heat and Mass Transfer in Porous Media[M].Beijing:Science Press,2006.)
[20]Bird R B,Stewart W E,Lightfoot E N,et al.Transport phenomena[J].John Wiley and Sons Inc,2006,28(2):338.
[21]李林波,曾文斌,朱军,等.CFD数值模拟技术在冶金中的应用[J].钢铁研究学报,2011,23(12):1.(Li L B,Zeng W B,Zhu J,et al.Application of CFD numerical simulation technology in metallurgy[J].Journal of Iron and Steel Research,2011,23(12):1.)