Energy Efficiency Analysis of Decoupled Coal Supercritical Water Gasification-Oxidation Hydrogen Production System

WANG Hao; SUN Weidong; WANG Chuang; LÜYouj un

doi:10.7652/xjtuxb202602006

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Energy Efficiency Analysis of Decoupled Coal Supercritical Water Gasification-Oxidation Hydrogen Production System

Special Topic Frontier Applications of Supercritical Fluids | 更新时间：2026-02-09

- Energy Efficiency Analysis of Decoupled Coal Supercritical Water Gasification-Oxidation Hydrogen Production System
- Journal of Xi'an Jiaotong University Vol. 60, Issue 2, Pages: 59-70(2026)
- 作者机构：
  
  西安交通大学绿色氢电全国重点实验室，710049，西安
  合肥零熵科技有限公司，230000，合肥
  河南中科清能科技有限公司，450040，郑州
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202602006
  CLC： TB37
- Received：07 August 2025，
  
  Published：10 February 2026
- 稿件说明：
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WANG Hao, SUN Weidong, WANG Chuang, et al. Energy Efficiency Analysis of Decoupled Coal Supercritical Water Gasification-Oxidation Hydrogen Production System[J]. Journal of Xi'an Jiaotong University, 2026, 60(2): 59-70.
DOI：

WANG Hao, SUN Weidong, WANG Chuang, et al. Energy Efficiency Analysis of Decoupled Coal Supercritical Water Gasification-Oxidation Hydrogen Production System[J]. Journal of Xi'an Jiaotong University, 2026, 60(2): 59-70. DOI： 10.7652/xjtuxb202602006.

摘要

针对煤炭超临界水气化制氢系统整体能量集成优化不足的问题，提出了一种以1000 m

·h

-1

氢气产量（在0℃、1个大气压的标准条件下）为目标的煤炭超临界水气化-氧化解耦式超临界水制氢示范系统，并基于热力学方法对该系统进行了能效分析。基于不同煤种的气化特性确定了解耦式系统的设计参数，考察了不同煤质、温度和压力对系统能量效率的影响规律；根据图像

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=100166912&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=100166912&type=small

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=100166912&type=middle

分析方法揭示了气化器、氧化器、换热器组和系统整体不可逆损失的产生机理。结果表明：在水煤质量比为1∶4，质量流量为1280 kg·h

-1

的条件下，红柳林煤的制氢效率高达66.92%；系统制氢效率随着预热水温度的增加呈现出先增加后下降的趋势，随着反应压力的增加，总产气量和氢气产量均下降；系统中气化反应器和氧化反应器的不可逆损失最大，高品位产气与低品位吸热混合工质之间存在较大品位差距是不可逆损失产生的主要原因；减少换热器不可逆损失的途径是减少冷热流体的品位差，即减少换热全过程的温度差。该研究结果可为煤炭超临界水气化制氢系统设计提供技术参考。

Abstract

To address the issue of insufficient overall energy integration and optimization in coal supercritical water gasification hydrogen production systems，this study proposes a demonstration system for decoupled supercritical water gasification-oxidation hydrogen production targeting a hydrogen output of 1000 m

·h

-1

（under standard conditions of 0℃ and 1 standard atmosphere）. A thermodynamic analysis of the system's energy efficiency is conducted.Design parameters of the decoupled system are determined based on gasification characteristics of different coal types，and the influence of different coal qualities，temperatures，and

pressures on the system's energy efficiency is investigated.The mechanisms of irreversible losses in the gasifier，oxidizer，heat exchanger group，and the entire system are revealed using graphical exergy analysis.The results indicate that under a coal-to-water mass ratio of 1∶4 and a mass flow rate of 1280 kg·h

-1

，the hydrogen production efficiency of Hongliulin coal reaches 66.92%.The system's hydrogen production efficiency initially increases and then decreases with rising preheated water temperature，while both total gas production and hydrogen yield decline with increasing reaction pressure.The gasifier and oxidizer contribute the largest irreversible losses in the system，primarily due to significant grade differences between high-grade gas-producing and low-grade heat-absorbing mixed working fluids.Reducing the grade difference between hot and cold fluids-i.e.，minimizing temperature differences throughout the heat exchange process-is the key approach to reducing irreversible losses in heat exchangers.The findings of this study provide technical references for the design of coal supercritical water gasification hydrogen production systems.

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