Abstract: A coal co-gasification method, comprising the following steps: 1, fuel and a first pressurised oxygen-containing gas are injected into a gasifier, and the fuel is ignited so as to increase the temperature inside the gasifier; 2, when the temperature increase reaches a temperature capable of igniting coal-water slurry to be injected, injection of the fuel and the first pressurised oxygen-containing gas is stopped, and the coal-water slurry and a second pressurised oxygen-containing gas are injected into the gasifier so as to perform coal-water slurry gasification; 3, once the coal-water slurry gasification has stabilised, a third pressurised oxygen-containing gas and carbon dioxide carrying powdered coal are injected into the gasifier to perform co-gasification. The method operates stably, and overcomes cumbersome and time-consuming adjustment steps in the prior art.

Abstract: An underground coal gasification furnace comprises an ignition system and a gas injection system. The ignition system is provided with a first vertical drilling well and a first horizontal directional drilling well in communication with the first vertical drilling well. The gas injection system is provided with a second drilling well introduced into a coal seam. At least one second horizontal directional drilling wells of a horizontal section in the coal seam serves as the second drilling well. Also provided is an underground coal gasification method. The method comprises: enabling a flaming fire region of a first horizontal directional drilling well to withdraw in a second horizontal directional drilling well until withdraw to near a coal feeding point. The underground coal gasification furnace eliminates the defects of low cut-through speed and unstable structure in a gasification production stage in the prior art.

Abstract: A gas injection apparatus with a controllable gas injection point, a gas injection process, and a gasification method. The gas injection apparatus comprises a directional well channel, where a continuous oil pipe is provided in the directional well channel. The continuous oil pipe is connected to an oxygen/oxygen-rich gas pipeline. An annular gap between the continuous oil pipe and the directional well channel is connected to an auxiliary gasification agent pipeline and a vapor pipeline. A gas injection wellhead is provided at the start end of the continuous oil pipe, and a nozzle is provided at the tail end.

Abstract: Provided is a method for fracture communication, passage processing and underground gasification of an underground carbon-containing organic mineral reservoir, where a mixture of CO2 and O2 is used as a medium for a fracture communication step, a passage processing step and/or a gasification step. The method uses the mixture of CO2 and O2 to extract and utilize the energy in the underground carbon-containing organic mineral reservoir, greatly increases energy utilization efficiency compared with conventional utilization schemes, and, compared with conventional underground gasification technologies, increases the calorific value of a combustible gas, increases and adjusts effective gas compositions, suppresses CO2 generation and reduces raw material gas production costs, while at the same time implements the capturing of CO2 and utilization of the same as a resource.

Abstract: Provided is a method for joint-mining of coalbed gas and coal. The method comprises: a well-drilling step; a fracturing and penetration step; a coalbed gas extraction step: an ignition step, and an underground gasification step. The method combines an underground coal gasification technology and a coalbed gas extraction technology, not only allows for utilization of the high temperature of underground gasification to heat a coalbed. thus increasing the permeability of a coal seam. and increasing the recovery rate of the coalbed gas, but also allows for utilization of the coalbed gas to perform the drilling and the fracturing and penetration processes, thus increasing the efficiency of underground coal gasification for mining.