以CO_2和H_2O为气化剂的煤焦气化模拟

基于整体煤气化联合循环和燃料电池发电技术,利用固体氧化物燃料电池产生的高温、高纯度CO2与H2O作为煤焦气化的气化剂,运用Aspen Plus模拟软件平台基于Gibbs自由能最小化方法对煤焦的H2O-CO2共气化反应进行了模拟计算。考察了O2流量、H2O流量、CO2流量、预热温度、操作压力、反应温度对气化反应合成气组成和煤气低位发热量的影响。结果显示:通过调节O2流量,得出O2的最佳流量为20 kg/h,此时反应温度和合成气低位热值处于最高值;分别增加水蒸气流量和CO2流量都使反应温度降低,且使反应活性降低导致合成气低位热值降低,所以合理控制水蒸气和CO2流量至关重要;降低操作压力会降低合成气的低位热值,但相对于物料流量改变,影响较小;CO2预热对煤气低位发热量的影响要小于O2的预热效果。

Simulation of coal char gasification using CO2 and H2O as gasification agent

Based on integrated gasification combined cycle （IGCC） and fuel cell power generation technologies, taking high purity CO2, produced by Solid Oxide Fuel Cells （SOFC） and H20 as gasification agent, discuss coal char gasification under high temperature. Simulate the gasification with Aspen Plus based on the Gibbs free energy minimization method. Investigate the effect of 02, CO2, vapour flow, pressure, preheating temperature, reaction temperature on synthesis gas composition and net calorific value. The results show that,when the 02 flow is 20 kg/h, the reaction temperature and net calorific value of synthesis gas is the best. The reaction activity decrease with the increase of vapour and CO2 flow, that leads to lower net calorific value. The decrease of pressure would lead to the same result, while its influence is less than the gas flow. 02 preheating has more effects on net calorific value than CO2 preheating.