煤炭地下气化过程稳定控制方法的研究

在煤炭地下气化过程中 ,由于炉内客观条件的不断变化 ,难以建立正常的加热制度和及时正确地控制鼓风气流和煤气的流动 ,从而影响气化过程稳定进行 .针对这一问题 ,在新河和刘庄煤炭地下气化现场试验的基础上 ,研究了三种控制气流的方法 ,即辅助通道供风气化、压抽结合供风气化和反向供风气化 .结果表明 ,这三种控制方法能够降低出口煤气中 CO2 的含量 ,提高煤气热值 ,稳定煤气产量 ,是现场试验和生产过程中实现连续、稳定生产的有效措施

Method of stably Controlling the Process of Underground Coal Gasification

Because the condition keeps changing within the gasifier in the process of underground coal gasification, the normal heating system is hard to be formed and the air and coal gas flow can not be controlled timely and correctly, influencing the gasification process. Aiming at this problem, 3 methods of air supply were worked out, they are the methods of supplying air by assistant tunnel, by combination of drawing with blowing, and by backward air blowing. The result shows that these methods can decrease the content of CO 2 in coal gas and increase the heat value, making the gas output be stable. So it is thought to be the efficient measures to realize a successive and stable gasification in the field trial.