煤炭超临界水气化-氧化解耦式制氢系统能效分析
打开文本图片集
关键词：超临界水气化；解耦式系统；图像烟分析；热力学中图分类号：TB37文献标志码：ADOI：10.7652/xjtuxb202602006 文章编号：0253-987X（2026）02-0059-12
Energy Efficiency Analysis of Decoupled Coal Supercritical Water Gasification-Oxidation Hydrogen Production System
WANG Hao1 ， SUN Weidongl²， WANG Chuang1，³，LU Youjun1 （1.State KeyLaboratoryof MultiphaseFlowin Power Engineering，Xi'an Jiaotong University，Xi'an710049，China; 2.Hefei Heatbase Technology Co.，Ltd.，Hefei 23oooo，China; 3.Henan Sinoscience Clean Energy Technology Co.，Ltd.， Zhengzhou 45o04o，China）
Abstract： To address the issue of insufficient overallenergy 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 1000m3⋅h-1 （under standard conditions of 0°C 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 1280kg⋅h-1 ，the hydrogen production efficiency of Hongliulin coal reaches 66.92% . The system’s hydrogen production eficiency 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 diference 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.
Keywords： supercritical water gasification； decoupled system；exergy utility diagram analysis; thermodynamics
与常规气化制氢技术相比[]，煤炭超临界水气化技术具有显著优势。（剩余16271字）
