Research on multi-energy coupled preheating system of city gate station based on Modelica simulation

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2024-10-10 DOI:10.1016/j.csite.2024.105279

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引用次数: 0

Abstract

Natural gas depressurization at city gate stations can cause hydrate formation, necessitating preheating before pressure regulation. To reduce the high energy consumption of traditional city gate station preheating processes, this study introduces four novel multi-energy coupled systems: photovoltaic-air source heat pump (PV-ASHP), solar thermal-combined heat and power-ASHP (ST-CHP-ASHP), CHP-ASHP, and ASHP system, with a typical city gate station in Shanghai taken as the research case. Dynamic energy simulation systems were developed in Dymola software to evaluate the proposed systems from energy, environmental, and economic perspectives, conducting a comparison with conventional boiler preheating systems, including sensitivity analysis of energy prices on system economics. Results indicate PV-ASHP has the lowest annual total cost (ATC) and shortest discounted payback period, while ATC values for ST-CHP-ASHP, CHP-ASHP, and ASHP increase by 6.4 %, 9.6 %, and 12.6 %, respectively. ST-CHP-ASHP and PV-ASHP demonstrate advantages in primary energy rate and carbon emissions, with ST-CHP-ASHP performing slightly better than PV-ASHP. Currently, PV-ASHP demonstrates the highest development potential. If photovoltaic feed-in tariffs remain constant, and natural gas prices decrease by over 12.5 % or CHP feed-in tariffs increase by over 38.4 %, ST-CHP-ASHP becomes more economically viable. This research provides valuable insights for retrofitting China's existing city gate station preheating systems.

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基于 Modelica 仿真的城门站多能源耦合预热系统研究

城市门站的天然气减压会导致水合物的形成，因此需要在压力调节前进行预热。为了降低传统城门站预热过程的高能耗，本研究以上海典型的城门站为研究案例，介绍了四种新型多能源耦合系统：光伏-空气源热泵（PV-ASHP）、太阳能光热-热电联产-ASHP（ST-CHP-ASHP）、热电联产-ASHP 和 ASHP 系统。利用 Dymola 软件开发了动态能源仿真系统，从能源、环境和经济角度对拟议系统进行评估，并与传统锅炉预热系统进行比较，包括能源价格对系统经济性的敏感性分析。结果表明，PV-ASHP 的年总成本（ATC）最低，贴现投资回收期最短，而 ST-CHP-ASHP、CHP-ASHP 和 ASHP 的 ATC 值分别增加了 6.4%、9.6% 和 12.6%。ST-CHP-ASHP 和 PV-ASHP 在一次能源利用率和碳排放量方面都具有优势，其中 ST-CHP-ASHP 的表现略好于 PV-ASHP。目前，PV-ASHP 的发展潜力最大。如果光伏发电上网电价保持不变，而天然气价格下降超过 12.5%，或热电联产上网电价上涨超过 38.4%，ST-CHP-ASHP 在经济上就更加可行。这项研究为改造中国现有的城门站预热系统提供了宝贵的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.