A heat-insulating and sealing method for the injection and exhaust drilling channel of an underground coal gasifier

Abstract

The invention discloses a coal underground gasifier air pouring and discharging drilling channel heat insulating hermetic stemming method. The coal underground gasifier air pouring and discharging drilling channel heat insulating hermetic stemming method includes the following steps that a [phi] I section and a [phi] II section of a hermetic drilling channel is constituted on one side, close to abottom plate rock lane, of an in situ gasification reacting furnace air pouring and discharging drilling channel in a segmented and bearizing mode, a [phi] I section drilling channel separation casingis installed, and the interval between a [phi] I section drilling channel wall and a separation casing I external wall is filled with high intensity and high temperature resistant materials for the first time; a [phi] II section drilling channel separation casing is installed, the interval between a [phi] II section drilling channel wall and a separation casing II external wall is filled with thehigh intensity and high temperature resistant materials for the second time, and solid bodies are arranged to block off building blocks; the front and tail end positions of the bottoms of the separation casing I and the separation casing II are correspondingly provided with temperature thermocouples, and leads of the temperature thermocouples are led to a temperature monitoring system in the bottom plate rock lane; and filling for the third time, an end blocking plate of the [phi] II section drilling channel separation casing II is installed and filled, the [phi] I section drilling channel and the inner part of the separation casing I and the separation casing II of the [phi] II section drilling channel are filled through a filling opening, and high temperature resistance cement is filleduntil filling compaction. The coal underground gasifier air pouring and discharging drilling channel heat insulating hermetic stemming method has the beneficial effects that good heat-insulation is conducted on parts of air pouring and discharging pipelines of a lane, and leakages of high temperature gases are prevented.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and relates to a heat-insulating, sealing and sealing method for an underground coal gasification furnace injection and exhaust drilling channel. Background technique [0002] Underground coal gasification is a new in-situ fluidized mining method for coal resources. During the underground gasification process, air, oxygen, saturated water vapor or The mixed gas generates high-temperature gas (including carbon monoxide, hydrogen, methane, carbon dioxide, etc.) at the high-temperature reaction interface in the underground gasifier, and then enters the external pipe network through the external exhaust pipe of the gasifier and is transported to the ground. In order to ensure the airtightness of the underground coal gasifier and prevent high-temperature toxic gas from leaking into the external roadway and causing harm to personnel, it is necessary to seal the part of the injection and exhaust dri...

AI Technical Summary

Problems solved by technology

In the existing technical scheme, there is an isolation and airtight wall in the roadway built by the well-type furnace, which is difficult to effectively isolate and seal the gas in the case of high pressure in the gasifier (the pressure in the gasifier can reach 1-2 MPa). The surrounding fissure zone is relatively developed, and it is difficult to effectively seal the high-pressure gas only by relying on the solid separation wall, and air leakage will inevitably occur

The existing isolation and airtight wall does not take into account the impact of the high temperature of the gas in the gasifier on the sealing material

In the existing technical solutions, there is no heat-insulated and sealed sealing scheme for the injection and exhaust drilling channel section connecting the in-situ coal seam reaction furnace and the floor rock roadway. The high-temperature and high-pressure gas in the coal seam reaction furnace is completely isolated to ensure the absolute safety of personnel in the operation space of the floor rock roadway

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