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

WANG Hao; SUN Weidong; WANG Chuang; LÜ Youjun

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

更新时间：2025-10-28

- Energy Efficiency Analysis of Hydrogen Production System by Decoupled Supercritical Water Gasification and Oxidation of Coal
- JOURNAL OF XI’AN JIAOTONG UNIVERSITY (2025)
- 作者机构：
  
  1.西安交通大学绿色氢电全国重点实验室,陕西省西安市710049
  2.合肥零熵科技有限公司,安徽省合肥市230000
  3.河南中科清能科技有限公司,河南省郑州市450040
- 作者简介：
- 基金信息：
- DOI：
  CLC： TB37
- Received：07 August 2025，
  
  Revised：2025-10-20，
  
  Accepted：28 October 2025，
- 稿件说明：
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WANG Hao, SUN Weidong, WANG Chuang, et al. Energy Efficiency Analysis of Hydrogen Production System by Decoupled Supercritical Water Gasification and Oxidation of Coal[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2025.
DOI：

WANG Hao, SUN Weidong, WANG Chuang, et al. Energy Efficiency Analysis of Hydrogen Production System by Decoupled Supercritical Water Gasification and Oxidation of Coal[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2025. DOI：

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1 000 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；根据图像㶲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1 280 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。该论文的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

Aiming at the problem of insufficient overall energy integration and optimization in the coal supercritical water gasification hydrogen production system

a coal supercritical water gasification-oxidative decoupling type supercritical water hydrogen production demonstration system targeting a hydrogen production capacity of 1000 Nm

·h

-1

was proposed

and the energy efficiency of this system was analyzed based on thermodynamic methods. The design parameters of the decoupled system were determined according to the gasification characteristics of different coal types

and the influence laws of different coal qualities

temperatures

and pressures on the system energy efficiency were investigated. The mechanism of irreversible loss generation in the gasifier

oxidizer

heat exchanger group

and the entire system was revealed using the Exergy Utility Diagram (EUD) method. The results show that under conditions of a water-coal 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 the rise in preheated water temperature

while both total gas yield and hydrogen production decrease with increasing reaction p

ressure. The largest irreversible losses occur in the gasification and oxidation reactors

mainly due to the significant exergy level difference between the high-grade product gas and the low-grade heat-absorbing mixed working fluid. Reducing the exergy level difference between the hot and cold fluids—i.e.

minimizing the temperature difference throughout the heat exchange process—is key to decreasing irreversible losses in heat exchangers. The findings of this study provide valuable technical references for the design of coal supercritical water gasification systems for hydrogen production.

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