Nozzle and underground coal gasification method

Abstract

Disclosed is a nozzle including a housing, the housing including a first portion and a second portion, the first portion and the second portion being in fluid communication via a front hole, and a side hole being provided on a side wall of the second portion. The nozzle further includes a sealing assembly able to open and close the front hole and the side hole in a sliding manner in the housing, and a spring provided between the housing and the sealing assembly. Furthermore, an underground coal gasification method using the nozzle is disclosed, which includes the steps of adjusting the injection flow rate and injection pressure of a gasification agent and the pressure of a gas output channel port, and controlling the opening and closing of the front hole and the side hole. The nozzle can optionally alternately or simultaneously open the front hole and the side hole without any manual operation. In the underground coal gasification process, opening the front hole of the nozzle can guide the movement of a gasification working face, opening the side hole can intensify gasification of a coal seam at two sides of a gasification channel, making the two sides of the gasification channel expand more uniformly, increasing the rate of recovery of coal resources.

Dependencies are inferred from the claim text.