有机朗肯循环在多品位余热发电中的应用
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摘要
低温余热的充分利用能够有效提高能源的利用效率、降低生产企业的能耗。本文以含硫天然气净化厂生产过程产生的余热为研究对象,对余热资源品位、余热回收潜能进行了分析和评价。通过对不同的余热发电方案进行分析对比,提出了以有机朗肯循环(ORC)为基础的多品位余热发电方案(MG-ORC),并对该发电方案进行了热力学分析。借助正交实验手段和多目标优化方法,对不同循环工质条件下MG-ORC发电方案的性能进行了对比分析,结果表明:工质R-600较其余4种工质表现出更优的综合性能,MG-ORC发电系统热效率为17.7%,净输出功率约2600kW。MG-ORC发电方案能够有效合理利用含硫天然气净化厂产生的余热,实现了能源的按质用能和梯级利用。
The full utilization of low-temperature waste heat can effectively improve the efficiency of energy use and reduce the energy consumption. The waste heat generated from the production process of sulfur-containing natural gas purification plants was the object of current study, and the quality of waste heat resources and the potential for waste heat recovery were analyzed and evaluated.Compared with the existing waste heat power generation schemes,a multi-grade heat recovery power generation scheme(MGORC) based on ORC was proposed, and thermodynamic analysis of the power generation scheme was conducted.The performance of the MG-ORC power generation scheme under different cycle conditions was compared using the orthogonal experiment method. The results showed that the comprehensive properties of R-600 were the best among other working media. The thermal efficiency of MG-ORC was17.7%,and the net output power was about 2600 kW.The study confirmed that the MG-ORC power generation scheme can effectively and rationally utilize the waste heat generated from the sulfurcontaining natural gas purification plant through cascade utilization of energy.
The full utilization of low-temperature waste heat can effectively improve the efficiency of energy use and reduce the energy consumption. The waste heat generated from the production process of sulfur-containing natural gas purification plants was the object of current study, and the quality of waste heat resources and the potential for waste heat recovery were analyzed and evaluated.Compared with the existing waste heat power generation schemes,a multi-grade heat recovery power generation scheme(MGORC) based on ORC was proposed, and thermodynamic analysis of the power generation scheme was conducted.The performance of the MG-ORC power generation scheme under different cycle conditions was compared using the orthogonal experiment method. The results showed that the comprehensive properties of R-600 were the best among other working media. The thermal efficiency of MG-ORC was17.7%,and the net output power was about 2600 kW.The study confirmed that the MG-ORC power generation scheme can effectively and rationally utilize the waste heat generated from the sulfurcontaining natural gas purification plant through cascade utilization of energy.
引文
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[2]郑宗和,葛昕,高金水,等.利用低温余热的低沸点介质发电系统[J].煤气与热力,2006,26(4):74-76.ZHENG Z H,GE X,GAO J S,et al.Low-boiling-medium power generation system utilizing low temperature waste heat[J].Gas and Heat,2006,26(4):74-76.
[3]秦文戈.ORC热水发电技术在芳烃联合装置中的应用[J].当代化工,2015,44(2):307-309.QIN W G.ORC hot water power generation technology in the application of aromatic compounds[J].Contemporary Chemical Industry,2015,44(2):307-309.
[4]严伯刚,刘峰.闪蒸技术纯低温余热发电的应用[J].江西科学,2012,30(6):802-805.YAN B G,LIU F.The application of flash evaporation technology for pure low temperature waste heat power generation[J].Jiangxi Science,2012,30(6):802-805.
[5]汪红.石化企业低温余热利用现状分析和前景展望[C]//青岛:中国石油和化工勘察设计协会热工设计专业委员会、全国化工热工设计技术中心站2014年年会,2014.WANG H.The status quo analysis and prospects of the utilization of low-temperature waste heat in petrochemical enterprises[C]//Qingdao:the Thermal Engineering Design Professional Committee of the China Petroleum and Chemical Survey and Design Association,and the Annual Meeting of the National Chemical Thermal Engineering Design Technology Center Station in 2014,2014.
[6]覃川,王林平,魏立军,等.长庆气田净化厂脱硫装置余热资源的分析与计算[J].节能技术,2016,34(1):61-62.TAN C,WANG L P,WEI L J,et al.Analysis and calculation of waste heat resources for desulfurization equipment in Changqing Gasfield Purification Plant[J].Energy Saving Technology,2016,34(1):61-62.
[7]RANT Z.Towards the estimation of specific exergy of fuels[J].Allg W?rmetech,1961,10:172-176.
[8]沈志光.制冷工质热物理性质表和图:SI制[M].北京:机械工业出版社,1983:2-69.SHEN Z G.Charts and diagrams of thermophysical properties of refrigerants:SI[M].Beijing:Machinery Industry Press,1983:2-69.
[9]肖万里.温差发电系统温度场及工作性能的仿真和实验研究[D].武汉:华中科技大学,2016.XIAO W L.Simulation and experimental research on temperature field and working performance of thermoelectric power generation system[D].Wuhan:Huazhong University of Science and Technology,2016.
[10]于立军,朱亚东,吴元旦.中低温余热发电技术[M].上海:上海交通大学出版社,2015:172-178.YU L J,ZHU Y D,WU Y D.Low-temperature waste heat power generation technology[M].Shanghai:Shanghai Jiaotong University Press,2015:172-178.
[11]隋元春,张振宇,姚源,等.闪蒸余热发电技术[C]//济南:全国水泥窑纯低温余热发电技术装备国产化研讨会,2007.SUI Y C,ZHANG Z Y,YAO Y,et al.Flash evaporation waste heat power generation technology[C].//Jinan:National Seminar on the Domestic Production of Pure Cryogenic Waste Heat Power Generation Technology and Equipment for Cement Kiln,2007.
[12]王梦颖,冯霄,王彧斐.不同余热情况下有机朗肯循环和卡琳娜循环能量性能对比[J].化工学报,2016,67(12):5089-5097.WANG M Y,FENG X,WANG Y F.Energy performance comparison of organic Rankine cycle and Karina cycle under different waste heat conditions[J].CIESC Journal,2016,67(12):5089-5097.
[13]蒋子桓.基于正交实验法的ORC实验平台优化设计[J].科技创新与应用,2016(5):38-39.JIANG Z H.ORC experimental platform optimization design based on orthogonal experiment method[J].Science and Technology Innovation and Application,2016(5):38-39.
[14]JIANG L,ZHU Y D,JIN V,et al.Comprehensive evaluation method of ORC system performance based on the multi-objective optimization[J].Advanced Materials Research,2014,997:721-727.
[15]唐焕文.实用数学规划导论[M].大连:大连工学院出版社,1986.TANG H W.Practical mathematical planning introduction[M].Dalian:Dalian Institute of Technology Press,1986.