煤炭地下催化气化工艺的研究

STUDY ON THE METHOD OF CATALYSIS ON UNDERGROUND COAL GASIFICATION

提出煤炭地下催化气化新工艺的概念,研究利用高压雾状催化剂-水蒸气带入装置并以钙基化合物为催化剂进行煤炭地下催化气化.在小型模拟地下气化炉中,以大雁褐煤为煤样,选用氢氧化钙水溶液(质量分数为5%,10%,15%)为催化剂进行纯氧气化.结果表明,添加氢氧化钙水溶液气化后的煤气与不加催化剂、添加10%CaCO3气化后的煤气相比,煤气中甲烷组分可以达到7.58%,煤气热值提高到5.43MJ/m3～7.87MJ/m3,产气率提高28%～69%,且可以稳定产气.催化剂组成(质量浓度)以添加Ca(OH)2为10%～15%之间进行气化效果最佳,为提高煤炭地下气化的稳定性开辟了一条全新的路径.

ABSTRACT This paper come up with a new concept, the method of catalysis on UCG, by introducing stream, a high-pressure vaporific catalysts, into installation so as to conduct UCG with calcium salts as its catalysts. In another oxygen gasification experience, we utilise the cata- lysts of calcium hydroxide water solution, the mass fraction of which are respectively 5%, 10%, 15% ,and 20%. It is found that the CH4 components and value of gas can be 7.58% higher, 5.43 MJ/m3-7.87 MJ/m3 after gasification under high-pressure vaporific catalysts than that with 10% CaCO3 and no any catalysts; the former, also brings higher rate of 28%-69% of producing gas and more stable production. This paper demonstrates that an optimized gasification result will come if mass fraction of Ca（OH）2 range from 10% to 15~/00 . This shows a brand new way to ensure UCG stablitiy. KEY WORDS underground coal gasification（UCG）, catalytic coal gasifaction, calcie compound