CN-224221306-U - Device for reforming methane in underground coal gasification product gas and reducing temperature

CN224221306UCN 224221306 UCN224221306 UCN 224221306UCN-224221306-U

Abstract

The utility model relates to the technical field of underground coal gas, in particular to a device for reforming methane in underground coal gasification product gas and reducing the temperature, which comprises a vertical coaxial three-sleeve heat exchange type reactor and a methane reforming catalyst, wherein the vertical coaxial three-sleeve heat exchange type reactor comprises an inner sleeve, an intermediate sleeve and an outer sleeve which are sequentially arranged from inside to outside, the methane reforming catalyst is filled in the intermediate sleeve, the vertical coaxial three-sleeve heat exchange type reactor is arranged in a product well of the underground coal gasification device, a product gas outlet is arranged at the top of the vertical coaxial three-sleeve heat exchange type reactor, and a product gas inlet is arranged at the bottom of the vertical coaxial three-sleeve heat exchange type reactor.

Inventors

ZHENG XIAN
XU SHOUZE
MIN ZHENHUA
Casper Jan Hendrick Berg

Assignees

中为(上海)能源技术有限公司

Dates

Publication Date: 20260512
Application Date: 20250528

Claims (7)

1. The device for reforming methane in underground coal gasification product gas and reducing the temperature comprises a vertical coaxial three-sleeve heat exchange type reactor and a methane reforming catalyst, and is characterized in that the vertical coaxial three-sleeve heat exchange type reactor comprises an inner sleeve (3), an intermediate sleeve (4) and an outer sleeve (5) which are sequentially arranged from inside to outside, the methane reforming catalyst is filled in the intermediate sleeve (4), the vertical coaxial three-sleeve heat exchange type reactor is arranged in a product well (6) of the underground coal gasification device, a product gas outlet (1) is arranged at the top of the vertical coaxial three-sleeve heat exchange type reactor, a plurality of heat exchange fins (2) are welded on the pipe wall of the inner sleeve (3), and a product gas inlet (7) is arranged at the bottom of the vertical coaxial three-sleeve heat exchange type reactor.
2. The device for reforming methane in underground coal gasification product gas and reducing the temperature according to claim 1, wherein the vertical coaxial three-sleeve heat exchange reactor is of a columnar structure, and the inner sleeve (3), the middle sleeve (4) and the outer sleeve (5) are made of stainless steel or nickel-based alloy steel.
3. The apparatus for reforming methane and reducing temperature in underground gasification product gas of coal according to claim 1, wherein the methane reforming catalyst is rhodium-based or nickel-based.
4. The device for reforming methane in underground coal gasification product gas and reducing temperature according to claim 1, wherein the inner sleeve (3) and the outer sleeve (5) are of hollow structures.
5. The device for reforming methane in underground gasification product gas of coal and reducing temperature according to claim 1, wherein the top end of the middle layer sleeve (4) is communicated with the top end of the inner layer sleeve (3), and the bottom end of the middle layer sleeve (4) is communicated with the bottom end of the outer layer sleeve (5).
6. An apparatus for reforming methane and reducing temperature in underground gasification product gas of coal as claimed in claim 1, wherein the flow directions of product gas in inner layer sleeve (3) and middle layer sleeve (4) are opposite to each other, and the product gas of product gas inlet (7) is from gasification zone (8) of underground gasification apparatus of coal.
7. A device for reforming methane in underground gasification product gas and reducing temperature according to claim 1, wherein the product gas inlet (7) is connected with the inner sleeve (3) in a penetrating way, and the product gas outlet (1) is connected with the outer sleeve (5) in a penetrating way.

Description

Device for reforming methane in underground coal gasification product gas and reducing temperature Technical Field The utility model relates to the technical field of underground coal gas, in particular to a device for reforming methane in underground coal gasification product gas and reducing temperature. Background Underground gasification of coal is a process in which coal is directly converted into product gas, commonly referred to as product gas or raw syngas, by controlled combustion and gasification reactions of an underground coal seam in the presence of an oxidant, which product gas can then be used as a feedstock for a variety of applications, including fuel production, chemical production, power generation, etc., and this underground gasification technology of coal is applicable for most coal deposits, and is clearly attractive in view of the environmental and safety requirements associated with mining industry and in view of the associated labor and capital costs. Product gas (raw synthesis gas) produced by underground gasification of coal typically contains CO,,,The relative proportions of the active ingredients depend on various aspects such as the type of oxidant (air or other oxidants such as oxygen, oxygen-enriched air or steam mixtures) used in the underground gasification of coal, the water in the coal seam or the water in the surrounding strata penetrating the coal seam, the quality of coal, and the operating parameters of the underground gasification process of coal, including temperature, pressure and the like, and the active ingredients of the product gas produced by the underground gasification of coal are mainly CO if the product gas is used as feed gas in the downstream synthetic gas chemical industry,,AndFor the subsequent synthetic gasification industry, if chemical fertilizers, methanol, olefins or synthetic oils are produced, it is often necessary to further add the product gasConversion to CO and by reforming reactionsThus, the CO and CO in the product gas are increased as much as possibleThe component content of (2) can greatly reduce and save the equipment scale and investment cost of the methane reforming section in the subsequent ground synthesis gas chemical device, and in addition, the underground coal gasification technology has long been faced with a problem of how to overcome a series of technical and device cost problems caused by high-temperature product gas which needs to be born by a product well. Therefore, aiming at the existing product gas which is used as the raw material gas in the downstream synthetic gas chemical industry and needs to increase the component content, the product well needs to bear high Wen Chanpin gas and high Wen Chanpin gas which is easy to damage the product well, a device for reforming methane in the underground coal gasification product gas and reducing the temperature can be designed, and methane can be reformed into CO and CO by utilizing methane reforming reactionThe sleeve type methane catalytic reforming reactor device disclosed by the utility model is arranged in a product well of a coal underground gasification device, so that the two problems can be solved well at the same time, and the CO in the product gas can be improvedThe contents of the two effective components also reduce the temperature of the product gas in the product well. Disclosure of utility model In order to solve the problems that if the existing product gas is used as the raw material gas of the downstream synthetic gas chemical industry, the component content needs to be improved, the product well needs to bear high Wen Chanpin gas, and the high Wen Chanpin gas is easy to damage the product well. The technical scheme of the utility model is that the device for reforming methane in underground coal gasification product gas and reducing the temperature comprises a vertical coaxial three-sleeve heat exchange type reactor and a methane reforming catalyst, wherein the vertical coaxial three-sleeve heat exchange type reactor comprises an inner sleeve, an intermediate sleeve and an outer sleeve which are sequentially arranged from inside to outside, the methane reforming catalyst is filled in the intermediate sleeve, the vertical coaxial three-sleeve heat exchange type reactor is arranged in a product well of the underground coal gasification device, the top of the vertical coaxial three-sleeve heat exchange type reactor is a product gas outlet, a plurality of heat exchange fins are welded on the pipe wall of the inner sleeve, and the bottom of the vertical coaxial three-sleeve heat exchange type reactor is a product gas inlet. Preferably, the vertical coaxial three-sleeve heat exchange type reactor is hoisted in a product well of the coal underground gasification device, the bottom of the vertical coaxial three-sleeve heat exchange type reactor is a product gas inlet, product gas with the temperature of about 1000 ℃ from a gasification zone enters the vertical coaxia