Novel underground coal gasification furnace

Abstract

The invention proposes a novel underground coal gasification furnace which is particularly suitable for the gasification of a coalbed containing water. An underground gasification furnace and a coalbed drainage passage integrated with each other are simultaneously constructed through a coalbed directional drilling process. The coalbed drainage passage can be effectively used for the coalbed drainage before gasification and the furnace body drainage during gasification, thereby ensuring the discharge of the water in the coalbed and consequently realizing the stable gasification of the coalbed containing water. The furnace has the advantages that the composite underground gasification furnace and the drainage passage are simultaneously constructed through the advanced coalbed directional drilling process, thereby bringing about easy execution and short construction period; as the drainage passage is positioned below the gasification passage, the drainage is smooth, and the problem of blockage does not easily happen; and the water in the drainage passage can be pumped out from a plurality of orientations, thereby bringing about rapid drainage. According to the requirements of furnace body drainage, the drainage holes of the gasification passage can be increased flexibly, thereby substantially solving the drainage problem of the coalbed containing water, and avoiding the impact of coalbed water inrush on coalbed gasification.

Description

Technical field [0001] The invention relates to the technical field of underground coal gasification and exploitation in mines, in particular to an underground coal gasification furnace. Background technique [0002] Underground coal gasification without wells is a process of gasification carried out by drilling holes in the original coal seam. Since the original coal seam has no coal seam water drainage measures, a large amount of groundwater is introduced during the drilling construction process. Therefore, coal seams under certain hydrogeological conditions, especially lignite coal seams, will contain a large amount of coal seam water. The existence of coalbed water has a serious impact on the ignition of underground coal gasification and large-scale gasification. A large amount of coal seam gushing water often destroys the combustion and gasification of the coal seam or even extinguishes the gasifier, and at the same time causes groundwater pollution. Therefore, it is very ne...

AI Technical Summary

Problems solved by technology

The furnace type takes into account both coal bed gasification and furnace body drainage, and the coal seam drainage is carried out through the special drainage channel connected with the coal bed gasification channel, which fundamentally solves the drainage problem of the gasification furnace

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