Work exchange is a promising innovative technology in recovering residual pressure energy. However, at the systematic level, the comprehensive utilization of different energy resources in an energy system has become a...Work exchange is a promising innovative technology in recovering residual pressure energy. However, at the systematic level, the comprehensive utilization of different energy resources in an energy system has become an issue of concern. In this work, a systematic approach is proposed, one that successively integrates heat, work and adjusts operation parameters. A detailed procedure for building a heat-work coupling transfer network is provided. The synthesis mainly consists of constructing a work exchange sub-network with pinch analysis based on positive displacement type work exchangers. Simultaneously, another kind of sub-network based on turbine-type work exchangers is built as a schematic comparison. The influence of applying a positive displacement work exchanger on the system is investigated. Finally, as a case study, a renovation design of a typical rectisol process in the coal-water slurry gasification section of an ammonia plant is presented. The results show that the added work exchanger has little impact on the existing heat exchange sub-network. Moreover,extra pressure energy is recovered by coupling the transfer network. It is concluded that the heat-work systematic design is a promising and powerful method to use energy more efficiently.展开更多
The "onion model" approach is proposed to optimize drying and associated processes that form an integrated drying system. The approach consists of first optimizing the core of the system formed of a dryer an...The "onion model" approach is proposed to optimize drying and associated processes that form an integrated drying system. The approach consists of first optimizing the core of the system formed of a dryer and drying process and then extending optimization for the shell comprising both downstream and upstream operations. The problem is illustrated by multiobjective optimization and pinch analysis of the heat pump assisted dryer.展开更多
采用丙烷质量分数为97%的液化石油气(LPG)生产丙烯,通过Aspen Plus流程模拟软件对60万t/a丙烷脱氢Oleflex工艺进行模拟与优化,并使用Aspen Energy Analyzer软件通过夹点技术对优化后的流程进行能量集成。结果表明:在模拟优化最佳工艺条...采用丙烷质量分数为97%的液化石油气(LPG)生产丙烯,通过Aspen Plus流程模拟软件对60万t/a丙烷脱氢Oleflex工艺进行模拟与优化,并使用Aspen Energy Analyzer软件通过夹点技术对优化后的流程进行能量集成。结果表明:在模拟优化最佳工艺条件下,LPG消耗量为73.28万t/a,可生产质量分数为99.6%的聚合级丙烯产品达60万t/a;系统用能优化后,热负荷降到6.032×10^(8)kJ/h,热公用工程降幅为23.67%;冷负荷降到5.889×10^(8)kJ/h,冷公用工程降幅为30.19%;增加换热器3台,总换热面积增加了9.95×10^(3)m^(2),总成本指数降低了18.38%。展开更多
基金supported by the National Natural Science Foundation of China (No. 20936004 and No. 21376187)
文摘Work exchange is a promising innovative technology in recovering residual pressure energy. However, at the systematic level, the comprehensive utilization of different energy resources in an energy system has become an issue of concern. In this work, a systematic approach is proposed, one that successively integrates heat, work and adjusts operation parameters. A detailed procedure for building a heat-work coupling transfer network is provided. The synthesis mainly consists of constructing a work exchange sub-network with pinch analysis based on positive displacement type work exchangers. Simultaneously, another kind of sub-network based on turbine-type work exchangers is built as a schematic comparison. The influence of applying a positive displacement work exchanger on the system is investigated. Finally, as a case study, a renovation design of a typical rectisol process in the coal-water slurry gasification section of an ammonia plant is presented. The results show that the added work exchanger has little impact on the existing heat exchange sub-network. Moreover,extra pressure energy is recovered by coupling the transfer network. It is concluded that the heat-work systematic design is a promising and powerful method to use energy more efficiently.
文摘The "onion model" approach is proposed to optimize drying and associated processes that form an integrated drying system. The approach consists of first optimizing the core of the system formed of a dryer and drying process and then extending optimization for the shell comprising both downstream and upstream operations. The problem is illustrated by multiobjective optimization and pinch analysis of the heat pump assisted dryer.
文摘采用丙烷质量分数为97%的液化石油气(LPG)生产丙烯,通过Aspen Plus流程模拟软件对60万t/a丙烷脱氢Oleflex工艺进行模拟与优化,并使用Aspen Energy Analyzer软件通过夹点技术对优化后的流程进行能量集成。结果表明:在模拟优化最佳工艺条件下,LPG消耗量为73.28万t/a,可生产质量分数为99.6%的聚合级丙烯产品达60万t/a;系统用能优化后,热负荷降到6.032×10^(8)kJ/h,热公用工程降幅为23.67%;冷负荷降到5.889×10^(8)kJ/h,冷公用工程降幅为30.19%;增加换热器3台,总换热面积增加了9.95×10^(3)m^(2),总成本指数降低了18.38%。
