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heat exchanger network Retrofit for Optimization of Crude Distillation Unit Using Pinch Analysis

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China Petroleum Processing & Petrochemical Technology 2021年第1期23卷 31-40页

作者： Sun Mengying Fu Dianliang Sun Lanyi State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580 School of Energy and Power Engineering Shandong UniversityJinan 250061

Crude distillation unit(CDU)is regarded as the main energy consumer in the entire refinery process.In this paper,the process simulation software and the energy management software are used to simulate the flowsheet and analyze the energy consumption,respectively.Stream data obtained from an existing CDU are applicable in the pinch analysis.To reduce the amount of cross-pinch heat transfer,three approaches of resequencing,repiping,and adding heat exchangers are adopted.Compared with the existing CDU,the results demonstrate that the inlet temperature of the furnace can be increased by 25.4℃,the amount of hot and cold utilities can be reduced by 15.1%and 19.6%,respectively.The economic evaluation indicates that the operating cost is saved by 8×106$/a,and the payback period is about 9 months.

关键词： crude distillation unit pinch analysis heat exchanger network retrofit energy saving

Flexibility analysis and design of heat exchanger network for syngas-to-methanol process

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International Journal of Coal Science & Technology 2021年第6期8卷 1468-1478页

作者： Jinchang Liu Pingping Zhang Qiang Xie Dingcheng Liang Lei Bai School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)D11 Xueyuan RoadHaidian DistrictBeijing 100083China Department of Chemical and Biomedical Engineering West Virginia University395 Evansdale DrivePO Box 6102MorgantownWV 26506-6102USA

The heat exchanger network(HEN)in a syngas-to-methanol process was designed and optimized based on pinch technology under stable operating conditions to balance the energy consumption and economic gain.In actual industrial processes,fluctuations in production inevitably affect the stable operation of HENs.A flexibility analysis of the HEN was carried out to minimize such disturbances using the downstream paths method.The results show that two-third of the downstream paths cannot meet flexibility requirements,indicating that the HEN does not have enough flexibility to accommodate the disturbances in actual production.A flexible HEN was then designed with the method of dividing and subsequent merging of streams,which led to 13.89%and 20.82%reductions in energy consumption and total cost,respectively.Owing to the sufficient area margin and additional alternative heat exchangers,the flexible HEN was able to resist interference and maintain production stability and safety,with the total cost increasing by just 4.08%.

关键词： heat exchanger network Syngas-to-methanol Pinch technology Flexibility analysis Design Optimization

Combining reinforcement learning with mathematical programming:An approach for optimal design of heat exchanger networks

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Chinese Journal of Chemical Engineering 2024年第5期69卷 63-71页

作者： Hui Tan Xiaodong Hong Zuwei Liao Jingyuan Sun Yao Yang Jingdai Wang Yongrong Yang State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311215China

heat integration is important for energy-saving in the process industry.It is linked to the persistently challenging task of optimal design of heat exchanger networks(HEN).Due to the inherent highly nonconvex nonlinear and combinatorial nature of the HEN problem,it is not easy to find solutions of high quality for large-scale problems.The reinforcement learning(RL)method,which learns strategies through ongoing exploration and exploitation,reveals advantages in such area.However,due to the complexity of the HEN design problem,the RL method for HEN should be dedicated and designed.A hybrid strategy combining RL with mathematical programming is proposed to take better advantage of both methods.An insightful state representation of the HEN structure as well as a customized reward function is introduced.A Q-learning algorithm is applied to update the HEN structure using theε-greedy strategy.Better results are obtained from three literature cases of different scales.

关键词： heat exchanger network Reinforcement learning Mathematical programming Process design

A simultaneous approach for integration of thermal energy storages in industrial processes using multiperiod heat integration

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Energy Storage and Saving 2022年第2期1卷 117-128页

作者： Simon Möhren Christian Schäfer Jörg Meyer Hartmut Krause SWK E2 Institute for Energy Technology and Energy Management Hochschule Niederrhein University of Applied ScienceKrefeld47805Germany Institute of Thermal Engineering TU Bergakademie FreibergFreiberg09599Germany

In times of increasing global warming,enormous efforts are required to rapidly reduce greenhouse gas(GHG)emissions.Due to the EU’s target of climate neutrality by 2050 and the even more ambitious goal of becoming climate-neutral in Germany by 2045,it is necessary to systematically increase energy efficiency and decarbonize the industrial heat sector.The methods of heat integration can be used to exploit existing potentials for waste heat utilization and to integrate renewable technologies for heating and cooling.By using a non-stationary,multiperiod approach,additional energy savings can be achieved by integrating a thermal energy storage(TES)that enables heat transportation over time.This paper presents a simultaneous approach for thermal energy storage integration into multiperiod heat integration problems.The approach can be used to minimize energy demand,costs and CO 2 emissions and is demonstrated in two case studies.In case study 1,it is shown that the presented approach is capable of integrating a TES properly into a simple multiperiod heat integration problem with two periods.In case study 2,a simplified example from a cosmetics manufactory is investigated.The total utility demand can be reduced by up to 44.3%due to TES integration and the energetic optimal storage size can be determined as 125 m 3.The savings are strongly dependent on the constellation of heat flows between the periods,on the temperature levels and on the storage size.Significant reductions of energy demand,costs and CO 2 emissions can be achieved with TES being properly integrated into a suitable operating environment.

关键词： Multiperiod heat integration Thermal energy storage Waste heat utilization heat exchanger network Energy efficiency

Automated retrofit targeting of heat exchanger networks

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Frontiers of Chemical Science and Engineering 2018年第4期12卷 630-642页

作者： Timothy G.Walmsley Nathan S.Lal Petar S.Varbanov Jiri J.Klemes Sustainable Process Integration Laboratory -SPIL NETME CentreFaculty of Mechanical Engineering Bmo University of TechnologyBmo 60190Czech Republic Energy Research Centre School of EngineeringUniversity of WaikatoHamilton 3240New Zealand

The aim of this paper is to develop a novel heat exchanger network (HEN) retrofit method based on a new automated retrofit targeting (ART) algorithm. ART uses the heat surplus-deficit table (HSDT) in combination with the Bridge Retrofit concepts to generate retrofit bridges option, from which a retrofit design may be formulated. The HSDT is a tabular tool that shows potential for improved re-integration of heat source and sink streams within a HEN. Using the HSDT, retrofit bridges—a set of modifications that links a cooler to a heater to save energy—may be identified, quantified, and compared. The novel retrofit method including the ART algorithm has been successfully implemented in Microsoft ExcelTM to enable analysis of large-scale HENs. A refinery case study with 27 streams and 46 existing heat exchangers demonstrated the retrofit method’s potential. For the case study, the ART algorithm found 68903 feasible unique retrofit opportunities with a minimum 400 kW·unit−1 threshold for heat recovery divided by the number of new units. The most promising retrofit project required 3 new heat exchanger units to achieve a heat savings of 4.24 MW with a favorable annualised profit and a reasonable payback period.

关键词： process retrofit pinch analysis heat exchanger network heat recovery

Integration of energy recovery network including recycling residual pressure energy with pinch technology

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Chinese Journal of Chemical Engineering 2017年第4期25卷 453-462页

作者： Jianqiang Deng Zheng Cao Dongbo Zhang Xiao Feng School of Chemical Engineering and Technology Xi'an Jiaotong University Shaanxi Coal and Chemical Technology Institute Co. Ltd

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.

关键词： Integration Process systems heat exchanger network Work exchange network Pinch technology Optimization

PINCH ANALYSIS METHOD FOR TOTAL SITE ENERGY INTEGRATION AND RETROFIT USING IN OIL REFINING

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PINCH ANALYSIS METHOD FOR TOTAL SITE ENERGY INTEGRATION AND ...

ENERGY AND ECONOMIC OPTIMIZATION FOR AUTOMOBILE PAINTING PROCESS

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作者： Yin Hongchao Zhang Ying Zhu Zhiguo Department of Power Engineering Dalian University of Technology Dalian, Liaoning P. R. China

Based on the total site pinch analysis with composite curves, the paper presents an improved method of total site energy integration synthesis for multi-processes, heat exchanger network and utility system. After fully heat-exchanged inner individual processes, the further integration for residual heat sources and sinks with utility system can be made. By making use of the rules of steam load plus/minus and steam load remove on the total composite curves, the fuel can be saved more and the cogeneration potential power can be increased. An energy integration example illustrates that the improved method can approach the targets of minimum utility usage or maximum co-generation power, and the increase of economic benefits is effective.

关键词： waste heat utilization heat exchanger network total site energy integration oil refinery processes.

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ENERGY AND ECONOMIC OPTIMIZATION FOR AUTOMOBILE PAINTING PRO...