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Heat Recovery for Adsorption Refrigeration System via pinch technology

Journal of Thermal Science 2022年第2期31卷 379-389页

作者： PAN Quanwen SHAN He TAMAINOT-TELTO Zacharie WANG Ruzhu Institute of Refrigeration and Cryogenics Shanghai Jiao Tong UniversityShanghai 200240China Engineering Research Center of Solar Power and Refrigeration MOEShanghai 200240China School of Engineering University of WarwickCoventry CV47ALUK

An adsorption refrigeration system can be driven by low grade heat and uses natural refrigerant with the advantage of reducing the greenhouse gases ***,one of the weaknesses is its low efficiency and more importantly its high *** recovery of internal waste heat becomes therefore very important in order to improve the coefficient of performance(COP).Analysis based on pinch technology can be helpful to optimal heat recovery *** this paper,temperature-heat diagrams and problem tables for adsorption refrigeration systems are proposed and analyzed using pinch *** results show that pinch point is located between beds and the main waste heat needs to be recovered between *** characteristic(time factor)of adsorption refrigeration system is the main resistance for heat *** effect of pinch point temperature difference on the system COP is not ***,when the driving temperature is 90°C,the COP of adsorption refrigeration via optimization of pinch analysis is 0.73 which is fairly comparable to Li Br-water absorption refrigeration *** technology can be adopted in different types of adsorption refrigeration systems(two-bed,four-bed,mass recovery,et al.).

关键词： heat recovery adsorption refrigeration pinch point pinch technology silica gel-water

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A Survey on a Heat Exchangers Network to Decrease Energy Consumption by Using pinch technology

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Journal of Environmental Science and Engineering 2011年第12期5卷 1648-1653页

作者： B. Raei A.H. Tarighaleslami Chemical Engineering Faculty Mahshahr Branch lslamic Azad University Mahshahr 63519 lran

There are several ways to increase the efficiency of energy consumption and to decrease energy consumption. In this paper. the application of pinch technology in analysis of the heat exchangers network （HEN） in order to reduce the energy consumption in a thermal system is studied. Therefore, in this grass root design, the optimum value of △Tmin, is obtained about 10℃and area efficiency （a） is 0.95. The author also depicted the grid diagram and driving force plot for additional analysis. In order to increase the amount of energy saving, heat transfer from above to below the pinch point in the diagnosis stage is verified for all options including re-sequencing, re-piping, add heat exchanger and splitting of the flows. Results show that this network has a low potential of retrofit to decrease the energy consumption, which pinch principles are planned to optimize energy consumption of the unit. Regarding the results of pinch analysis, it is suggested that in order to reduce the energy consumption, no alternative changes in the heat exchangers network of the unit is required. The acquired results show that the constancy of network is completely confirmed by the high area efficiency infirmity of the heat exchanger to pass the pinch point and from of deriving force plot.

关键词： pinch technology heat exchangers network energy consumption composite curve grand composite curve.

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Coupling pinch analysis and rigorous process simulation for hydrogen networks with light hydrocarbon recovery

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Chinese Journal of Chemical Engineering 2021年第12期34卷 141-148页

作者： Minbo Yang Xiao Feng Liang Zhao Shaanxi Key Laboratory of Energy Chemical Process Intensification School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi'an 710049China Key Laboratory of Advanced Control and Optimization for Chemical Processes East China University of Science and TechnologyMinistry of EducationShanghai 200237China

In refineries,some hydrogen-rich streams contain considerable light hydrocarbons that are important raw materials for the chemical *** hydrogen networks with light hydrocarbon recovery can enhance the reuse of both hydrogen and light *** work proposes an automated method for targeting hydrogen networks with light hydrocarbon recovery.A pinch-based algebraic method is improved to determine the minimum fresh hydrogen consumption and hydrogen sources fed into the light hydrocarbon recovery unit *** process simulation is conducted to determine the mass and energy balances of the light hydrocarbon recovery *** targeting procedures are developed through combination of the improved pinch method and rigorous process *** hybrid method is realized by coupling the Matlab and Aspen HYSYS platforms.A refinery hydrogen network is analyzed to illustrate application of the proposed *** integration of hydrogen network with light hydrocarbon recovery further reduces fresh hydrogen requirement by463.0 m^(3)·h^(-1) and recovers liquefied petroleum gas and gasoline of 1711.5 kg·h^(-1) and 643 kg·h^(-1),respectively.A payback period of 9.2 months indicates that investment in light hydrocarbon recovery is economically attractive.

关键词： Hydrogen Light hydrocarbon recovery pinch technology Simulation Systems engineering

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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 *** 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 *** 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,*** 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

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Optimizing Low-Temperature Heat Recovery in a Refinery Fluid Catalytic Cracking Unit Based on pinch Analysis

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China Petroleum Processing & Petrochemical technology 2012年第2期14卷 82-88页

作者： Zhao Dongfeng Xue Jianliang Li Shi Shen Chanchan College of Chemical Engineering China University of Petroleum(East China) Qingdao 266555

In this paper, the research was focused on optimizing low-temperature heat recovery to adopt multi-effect distil- lation （MED） in desalination by pinch technology. And further analysis indicated that phase changes occurred during the heat recovery process. In such case, the feed stream was divided into two streams： the liquid feed stream and the gaseous feed stream. Through calculation, the optimal ATmin was established at 26℃, and the total cost of heat exchange process was only $1.098× 106. By using the Problem Table Algorithm for pinch analysis, the temperature of the hot and the cold steams was 119℃ and 93 ℃, respectively. At a temperature higher than 119 ℃, all heat of the hot stream could not be cooled by the condenser, and the minimum heat load of utility （***） was 440457.64 kW; and at a temperature below 93 ℃, all heat of the cold stream could not be provided by the heater, and the minimum cold load of utility （***） was 1965993.85 kW. Finally, the synthesis of heat exchanger network was established through integrating two heat exchanger networks.

关键词： low temperature heat recovery pinch technology phase change optimal ATtain

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