{"title":"Workflow Design and Operational Analysis of a Coal-Based Multi-Energy Combined Supply System for Electricity, Heating, Cooling, and Gas","authors":"Shiwei Yu, Dedong Li, Zhongyi Zuo, Mingjie Feng","doi":"10.1002/ese3.70137","DOIUrl":null,"url":null,"abstract":"<p>The combined cooling, heating, and power (CCHP) system, as a typical representative of novel distributed energy systems, demonstrates significant advantages in the cascade utilization of energy and the control of transmission and distribution losses. However, the inherent reliance of traditional CCHP systems on natural gas as fuel structurally conflicts with China's energy endowment, characterized by abundant coal and scarce natural gas, severely limiting their large-scale application. To adapt to this energy consumption profile and fully leverage the strengths of CCHP systems, this study establishes a coal-fueled electricity-gas-heating-cooling polygeneration system based on physical and mathematical models within the Aspen Plus 9.0 commercial simulation platform. The reliability of the proposed model is validated through comparisons with data from relevant literature. To identify the optimal operating parameters, the effects of coal-water slurry concentration and oxygen-to-coal ratio on key gasification indicators (e.g., gasifier temperature, syngas composition, syngas calorific value, and cold gas efficiency) and system output loads (e.g., electricity, heating, cooling, and municipal gas) are systematically investigated. Finally, a comprehensive simulation of the entire system is conducted, with energy and exergy analyses performed on major functional units. The results indicate that coal-water slurry concentration and oxygen-to-coal ratio significantly influence gasifier temperature, syngas composition, calorific value, and cold gas efficiency. The system achieves optimal performance at an oxygen-to-coal ratio of 1.05 and a coal-water slurry concentration of 65%. Under design conditions, the system attains a comprehensive energy efficiency of 66.18% and an exergy efficiency of 34.43%. This study provides an innovative solution to address technological bottlenecks in China's energy transition, not only enhancing the efficiency of clean coal utilization but also offering a new technical pathway for coal-fired power transformation under the “dual carbon” goals (carbon peaking and carbon neutrality).</p>","PeriodicalId":11673,"journal":{"name":"Energy Science & Engineering","volume":"13 7","pages":"3791-3805"},"PeriodicalIF":3.5000,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ese3.70137","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Energy Science & Engineering","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/ese3.70137","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
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Abstract
The combined cooling, heating, and power (CCHP) system, as a typical representative of novel distributed energy systems, demonstrates significant advantages in the cascade utilization of energy and the control of transmission and distribution losses. However, the inherent reliance of traditional CCHP systems on natural gas as fuel structurally conflicts with China's energy endowment, characterized by abundant coal and scarce natural gas, severely limiting their large-scale application. To adapt to this energy consumption profile and fully leverage the strengths of CCHP systems, this study establishes a coal-fueled electricity-gas-heating-cooling polygeneration system based on physical and mathematical models within the Aspen Plus 9.0 commercial simulation platform. The reliability of the proposed model is validated through comparisons with data from relevant literature. To identify the optimal operating parameters, the effects of coal-water slurry concentration and oxygen-to-coal ratio on key gasification indicators (e.g., gasifier temperature, syngas composition, syngas calorific value, and cold gas efficiency) and system output loads (e.g., electricity, heating, cooling, and municipal gas) are systematically investigated. Finally, a comprehensive simulation of the entire system is conducted, with energy and exergy analyses performed on major functional units. The results indicate that coal-water slurry concentration and oxygen-to-coal ratio significantly influence gasifier temperature, syngas composition, calorific value, and cold gas efficiency. The system achieves optimal performance at an oxygen-to-coal ratio of 1.05 and a coal-water slurry concentration of 65%. Under design conditions, the system attains a comprehensive energy efficiency of 66.18% and an exergy efficiency of 34.43%. This study provides an innovative solution to address technological bottlenecks in China's energy transition, not only enhancing the efficiency of clean coal utilization but also offering a new technical pathway for coal-fired power transformation under the “dual carbon” goals (carbon peaking and carbon neutrality).
冷热电联产（CCHP）系统作为新型分布式能源系统的典型代表，在能量梯级利用和输配电损耗控制方面具有显著优势。然而，传统热电联产系统对天然气作为燃料的固有依赖与中国煤炭丰富、天然气稀缺的能源禀性存在结构性冲突，严重制约了其大规模应用。为了适应这一能耗格局，充分发挥CCHP系统的优势，本研究在Aspen Plus 9.0商业仿真平台上，基于物理模型和数学模型，建立了燃煤电-气-热-冷多联产系统。通过与相关文献数据的比较，验证了所提模型的可靠性。为了确定最佳运行参数，系统研究了水煤浆浓度和氧煤比对关键气化指标（如气化炉温度、合成气成分、合成气热值和冷气效率）和系统输出负荷（如电力、供暖、制冷和市政用气）的影响。最后，对整个系统进行了全面的仿真，并对主要功能单元进行了能量和火用分析。结果表明，水煤浆浓度和氧煤比对气化炉温度、合成气组成、热值和冷气效率有显著影响。系统在氧煤比为1.05、水煤浆浓度为65%时达到最佳性能。在设计条件下，系统的综合能源效率为66.18%，火用效率为34.43%。本研究为解决中国能源转型的技术瓶颈提供了创新解决方案，不仅提高了清洁煤利用效率，而且为“双碳”目标（碳调峰和碳中和）下的燃煤发电转型提供了新的技术途径。
期刊介绍：
Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.
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