Gasifying agent and water mixing atomizing nozzle and atomizing method thereof

Abstract

The invention discloses a gasifying agent and water mixing atomizing nozzle and an atomizing method thereof. The atomizing nozzle comprises a nozzle body with a central through hole, a central spray pipe is arranged in the central through hole, the tail end of the central spray pipe is contracted into a conical spray port, an annulus channel is arranged between the nozzle body and the central spray pipe, the central spray pipe is surrounded by the annulus channel, a guide sleeve is connected with the tail end of the annulus channel, and a mixing chamber is connected with the tail end of the guide sleeve. According to the gasifying agent and water mixing atomizing nozzle and the atomizing method thereof, by enhancing the water atomization effect and increasing the specific surface area of liquid drop, the phase interface area with coal heat and mass transfer is increased, and the combustion and gasification reaction efficiency is improved; and since the gasification agent and atomized water are simultaneously sprayed into the coal seam combustion and gasification reaction working face, the direct contact reaction with the gasification working face is achieved, the water injection volume is reduced, and the thermal efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of underground coal gasification, in particular to a gasifying agent and water mixing atomizing nozzle and an atomizing method thereof. Background technique [0002] Underground coal gasification is the process of directly injecting gasification agent into underground coal seam for combustion and gasification reaction to produce synthesis gas (or fuel gas). The gas quality is mainly affected by the distribution mode of gasification agent, oxygen concentration and gasification agent composition. . From the perspective of reaction process, underground coal gasification is similar to ground fixed bed gasification, such as Lurgi furnace. However, it is different from the ground Lurgi furnace, which generally adopts pure oxygen-steam gasification process, adjusts the temperature in the furnace by controlling the water vapor content, and controls the melting state of ash to ensure solid slag discharge. The under...

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Problems solved by technology

The underground coal gasification process is generally difficult to directly transport water vapor to the ground, because the steam is easy to condense and the large heat loss caused by phase transition makes it not technically economical to transport steam

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