水气转化对超临界水煤气化的抑制特性  

Inhibition of water-gas shift reaction on coal gasification in supercritical water

作　　者：赵帅琪 张瑞[1] 黄瀚 赵昆鹏[1] 白博峰[1] ZHAO Shuaiqi;ZHANG Rui;HUANG Han;ZHAO Kunpeng;BAI Bofeng(State Key Laboratory of Multiphase Flow Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)

机构地区：[1]西安交通大学绿色氢电全国重点实验室,陕西西安710049

出　　处：《化工学报》2024年第8期2960-2969,共10页CIESC Journal

基　　金：国家自然科学基金基础科学中心项目(52488201);国家自然科学基金青年基金项目(52206208)。

摘　　要：水气转化是煤炭超临界水气化技术中关键的均相化学反应。然而,水气转化反应对煤颗粒孔隙内非均相气化反应的影响尚不清楚。通过三维数值模拟,研究了颗粒孔隙内部水气转化反应对不规则煤颗粒超临界水气化过程的作用机理。研究结果表明,孔隙内的水气转化反应掉了大量用于煤的非均相气化反应的超临界水,降低了颗粒的气化反应速率,同时大量生成二氧化碳并富集于颗粒孔隙中,减小了孔隙中超临界水的扩散系数。定义了有效气化因子以定量表征水气转化反应对颗粒气化的抑制程度,发现了该抑制作用随颗粒粒径的增大而增强,且由于该抑制作用而增加的颗粒气化反应时间与有效气化因子呈简单对数关系。Water-gas shift reaction(WGSR)is a key homogeneous reaction in the supercritical water gasification(SCWG)of coal,but the impact of the WGSR on the heterogeneous reaction of coal in the particle pores remains unclear.The mechanism of intrapore water-gas shift reaction on the SCWG of irregular-shaped coal particles was investigated through three-dimensional numerical simulation.It is revealed that the intrapore WGSR consumed a significant amount of supercritical water intended for the heterogeneous reaction of coal,inhibiting the gasification rate.Additionally,a large amount of CO_(2) was generated and accumulated in the particle pores,reducing the diffusion coefficient of the supercritical water.An effective gasification factor was introduced to quantitatively characterize the inhibition by the intrapore WGSR,showing that the inhibition effect increased with the particle size.The increased gasification time of the coal particle due to the inhibition was found to have a simple logarithmic relationship with the effective gasification factor.

关 键 词：多孔颗粒 多相反应 煤炭 超临界水气化 

分 类 号：TQ541[化学工程—煤化学工程]