CIESC Journal ›› 2023, Vol. 74 ›› Issue (11): 4688-4701.DOI: 10.11949/0438-1157.20230948

• Energy and environmental engineering • Previous Articles     Next Articles

Thermodynamic analysis of CO2 near-zero-emission power system with integrated solar energy, supercritical water gasification of coal and SOFC

Zhewen CHEN(), Junjie WEI, Yuming ZHANG(), Wei ZHANG, Jiazhou LI   

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
  • Received:2023-09-11 Revised:2023-10-27 Online:2024-01-22 Published:2023-11-25
  • Contact: Yuming ZHANG

CO2近零排放的光煤互补耦合SOFC发电系统热力学分析

陈哲文(), 魏俊杰, 张玉明(), 张炜, 李家州   

  1. 中国石油大学(北京)重质油国家重点实验室,北京 102249
  • 通讯作者: 张玉明
  • 作者简介:陈哲文(1990—),男,博士,讲师,2022880013@cup.edu.cn
  • 基金资助:
    国家自然科学基金项目(52206036);中国石油大学(北京)科研基金项目(2462022SZBH004)

Abstract:

Based on the composition characteristic of the syngas produced through supercritical water gasification of coal, a novel CO2 near-zero-emission power system with integrated supercritical water gasification of coal with solid oxide fuel cell (SOFC) is proposed. Solar energy is used to heat the gasification chamber water supply and provide coal gasification reaction heat. The gasified syngas enters the SOFC to generate electricity. The exhaust gas from the anode of the SOFC is combusted with pure oxygen in the combustor of the gas turbine, and CO2/H2O mixture is produced. CO2 can be easily separated and captured. The influences of key parameters such as coal-water-slurry concentration in the gasifier, working temperature of the SOFC, and reforming temperature on the system performances are studied. The distribution pattern, transfer and transformation mechanisms of the energy and exergy in the system are revealed. As the previously mentioned key parameters are 11.3%(mass), 1000℃, and 750℃, respectively, the power efficiency can reach 47.59%. This research achieves near-zero CO2 emissions through the complementary cascade utilization of coal chemical energy and solar energy, combined with electrochemical reactions in SOFC and oxygen-rich combustion technology in the combustion chamber, which is of great significance to achieving the dual-carbon goal.

Key words: process systems, solar energy, supercritical water gasification of coal, integration, SOFC, computer simulation

摘要:

基于超临界水煤气化合成气的成分特征,提出了一种新型CO2近零排放的太阳能驱动超临界水煤气化耦合固体氧化物燃料电池(SOFC)发电系统。太阳能用于加热气化室给水以及提供煤气化反应热,气化合成气进入SOFC发电,SOFC阳极排气与纯氧在燃气轮机燃烧室内发生燃烧反应,产物为CO2/H2O混合物,易于实现CO2的分离捕集。研究了气化室内煤浆浓度、SOFC工作温度以及重整温度等关键参数对系统性能的影响规律,揭示了系统能量能质的分布规律及转移转化机制,上述参数分别为11.3%(质量)、1000℃以及750℃时,系统的发电效率可达到47.59%。该研究通过煤炭化学能与太阳能的互补梯级利用,结合SOFC内电化学反应及燃烧室内富氧燃烧技术,实现了CO2近零排放,对实现双碳目标具有重要意义。

关键词: 过程系统, 太阳能, 超临界水煤气化, 集成, SOFC, 计算机模拟

CLC Number: