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.