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Processes
Special Issues
Application of Heat Recovery Systems in Energy
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Application of Heat Recovery Systems in Energy

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Energy Systems".

Deadline for manuscript submissions: closed (5 April 2023) | Viewed by 7146

Special Issue Editors

Dr. Lixia Kang

E-Mail Website
Guest Editor
Department of Chemical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Interests: heat recovery system; energy system; process modelling; system optimizaiton
Dr. Le Wu

E-Mail Website
Guest Editor
Department of Chemical Engineering, Northwest University, Xi’an 710069, China
Interests: modeling; optimization; heat recovery; techno-economic analysis

Special Issue Information

Dear Colleagues,

Heat recovery is one of the major issues for the sustainable energy industry and a wide range of technologies are now available to recover lost heat in various heavy, energy-intensive factories and plants, from chemical industries to power plants and food manufacturing plants, etc. The amount of energy that is lost through emissions can be greatly reduced by the use of heat recovery systems. In this regard, exploring the application of heat recovery system in different energy industries seems critical to building a carbon-neutral society.

Thus this Special Issue (SI) focuses on the analysis, modelling, design, optimization, and management of the heat recovery systems and their applications in various energy industries. Manuscripts on related topics, such as energy conservation, energy conversion, energy efficiency improvement, exergy analysis, and on economic and policy issues, are also welcome in this Special Issue to offer insight to the future readers into the current state of this wide topic.

Dr. Lixia Kang
Dr. Le Wu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Processes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • applications
  • heat recovery technologies
  • heat recovery systems
  • heat integration
  • energy systems
  • energy conversion
  • energy management
  • energy conservation
  • waste heat

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Published Papers (4 papers)

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Research

18 pages, 8245 KiB  
Article
Comprehensive Experimental and Numerical Optimization of Diesel Engine Thermal Management Strategy for Emission Clarification and Carbon Dioxide Control
by Da Li, Sipeng Zhu, Guodong Zhang, Ke Sun, Shuzhan Bai, Guoxiang Li and Hao Cheng
Processes 2023, 11(4), 1252; https://doi.org/10.3390/pr11041252 - 18 Apr 2023
Cited by 1 | Viewed by 1512
Abstract
Improving the thermal efficiency of truck diesel engines requires comprehensive optimization of the engine, exhaust aftertreatment (EAT), and possible waste heat recovery (WHR). Lower exhaust temperature at mid and low working points has caused difficulty in both emission clarification and heat recovery, which [...] Read more.
Improving the thermal efficiency of truck diesel engines requires comprehensive optimization of the engine, exhaust aftertreatment (EAT), and possible waste heat recovery (WHR). Lower exhaust temperature at mid and low working points has caused difficulty in both emission clarification and heat recovery, which requires thermal management. Based on the diesel engine bench test and separate bench tests, this paper focuses on the thermal management strategy optimization, to increase the exhaust temperature at lower working points and optimize the thermal efficiency of the whole system. The test and numerical analysis showed that as exhaust temperature increased from 200~250 °C to 300~350 °C, soot passive regeneration reactions were enhanced, nitrogen oxide emission decreased, and energy recovery was improved. Moderate throttle valve adjustment coupled with early post injection could effectively achieve the required temperature increase. The optimized thermal management strategy increased the fuel consumption rate by no more than 1%. Meanwhile, the WHR system output increased significantly, by 62.55% at a certain mid–low working point. System CO2 emission decreased by an average of 5.4% at selected working points. Full article
(This article belongs to the Special Issue Application of Heat Recovery Systems in Energy)
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17 pages, 3157 KiB  
Article
Exergoeconomic Analysis of an Integrated Solar Combined Cycle in the Al-Qayara Power Plant in Iraq
by Wadah Talal and Abdulrazzak Akroot
Processes 2023, 11(3), 656; https://doi.org/10.3390/pr11030656 - 21 Feb 2023
Cited by 8 | Viewed by 1859
Abstract
Enhancing the sustainability and diversification of Iraq’s electricity system is a strategic objective. Achieving this goal depends critically on increasing the use of renewable energy sources (RESs). The significance of developing solar-powered technologies becomes essential at this point. Iraq, similar to other places [...] Read more.
Enhancing the sustainability and diversification of Iraq’s electricity system is a strategic objective. Achieving this goal depends critically on increasing the use of renewable energy sources (RESs). The significance of developing solar-powered technologies becomes essential at this point. Iraq, similar to other places with high average direct normal irradiation, is a good location for concentrated solar thermal power (CSP) technology. This study aims to recover the waste heat from the gas turbine cycle (GTC) in the Al-Qayara power plant in Iraq and integrate it with a solar power tower. A thermoeconomic analysis has been done to support the installation of an integrated solar combined cycle (ISCC), which uses concentrated solar tower technology. The results indicate that the examined power plant has a total capacity of 561.5 MW, of which 130.4 MW is due to the waste heat recovery of G.T.s, and 68 MW. is from CSP. Due to the waste heat recovery of GTC, the thermal and exergy efficiencies increase by 10.99 and 10.61%, respectively, and the overall unit cost of production is 11.43 USD/MWh. For ISCC, the thermal and exergy efficiencies increase by 17.96 and 17.34%, respectively, and the overall unit cost of production is 12.39 USD/MWh. The integrated solar combined cycle’s lowest monthly capacity was about 539 MW in September, while its highest monthly capacity was approximately 574.6 MW in April. Full article
(This article belongs to the Special Issue Application of Heat Recovery Systems in Energy)
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15 pages, 1067 KiB  
Article
Design and Optimization of Coal to Hydrogen System Coupled with Non-Nominal Operation of Thermal Power Unit
by Li Zhang, Yu Zhang, Jianping Tang, Lixia Kang and Yongzhong Liu
Processes 2022, 10(12), 2600; https://doi.org/10.3390/pr10122600 - 5 Dec 2022
Viewed by 1654
Abstract
In an actual thermal power plant, deep peak shaving will cause thermal power units to run under non-nominal conditions for an extended period, resulting in serious problems such as increased equipment wearing, low equipment utilization efficiency and decreased benefits. To this end, in [...] Read more.
In an actual thermal power plant, deep peak shaving will cause thermal power units to run under non-nominal conditions for an extended period, resulting in serious problems such as increased equipment wearing, low equipment utilization efficiency and decreased benefits. To this end, in this work, both the design and optimization method for a coal to hydrogen system which is coupled with the expected non-nominal operation of thermal power units are proposed. Aiming towards maximum profit in the context of thermal power plants, a mathematical optimization model for a coal to hydrogen system based on the multi-period operating conditions of thermal power plants is established. The corresponding optimal design scheme of the coal to hydrogen system is determined using variable operating conditions. The superiority of the integrated system compared with an independent system is explored and the feasibility of the proposed method is verified by using the case study of an actual thermal power plant. The results show that compared with the independent system, the economic benefits of the integrated system can increase by 13.56%, where the sale of hydrogen in the coal to hydrogen system accounts for 60.3% of the total benefit. The main expenditure associated with the system is the purchase cost of feedstock coal, accounting for 91.8%. Since the required power and medium-pressure steam in the coal to hydrogen process are provided by thermal power units, the minimum operating load of the thermal power plant in the integrated system increases from 40% to 60.1%, which significantly improves the utilization efficiency and service life of the generator units. In addition, the proposed integration scheme of the system is simple and controllable, which can contribute to the maintenance of the safe and stable operation of power generation and hydrogen production processes. These results are expected to provide the necessary methodological guidance for the integration and optimization of coal-fired power plants and coal to hydrogen systems. Full article
(This article belongs to the Special Issue Application of Heat Recovery Systems in Energy)
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17 pages, 2381 KiB  
Article
Optimum Design of a Solar-Wind-Diesel Hybrid Energy System with Multiple Types of Storage Devices Driving a Reverse Osmosis Desalination Process
by Yinghua Jiang, Jing Zhao and Zhangfa Tong
Processes 2022, 10(11), 2199; https://doi.org/10.3390/pr10112199 - 26 Oct 2022
Cited by 4 | Viewed by 2133
Abstract
To simultaneously satisfy the electricity and freshwater requirements, a superstructure of a solar-wind-diesel hybrid energy system (HES) with multiple types of storage devices driving a reverse osmosis desalination (ROD) process is established in this paper. The corresponding mathematical model of the HES, potentially [...] Read more.
To simultaneously satisfy the electricity and freshwater requirements, a superstructure of a solar-wind-diesel hybrid energy system (HES) with multiple types of storage devices driving a reverse osmosis desalination (ROD) process is established in this paper. The corresponding mathematical model of the HES, potentially including photovoltaic cells, a wind turbine, a diesel generator, a ROD unit, different battery storage technologies, or a water tank is developed and features mixed integer linear programming. The optimum design and operation schemes of the HES can be obtained by taking the minimum total annual cost as the optimization objective. To verify the effectiveness of the proposed method, an example of a solar-wind-diesel system for supplying a ROD process in Saudi Arabia is adopted. The results show that a photovoltaic panel, wind turbine, diesel generator, lead-acid battery, Li-ion battery and water tank are selected in the HES with the minimum total annual cost (i.e., 1.16 × 105 USD·y−1), by satisfying the requirement of the renewable energy penetration rate (i.e., 0.8). Then, a quantified method is proposed to determine the optimal design and operation schemes of the HES, including both economic and environmental aspects. Finally, the HES with various generators and multiple types of storage devices shows a better performance in terms of economy and renewable energy utilization. Full article
(This article belongs to the Special Issue Application of Heat Recovery Systems in Energy)
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