Fixed-bed coal seam gas non-catalytic deoxygenation device and method

Abstract

The invention discloses a fixed-bed coal seam gas non-catalytic deoxygenation device and method.The device comprises a fixed-bed deoxygenation furnace, wherein a sidewall and conical top of a furnace body are provided with a water jacket surrounding the sidewall and the conical top; the upper portion of the water jacket at the conical top is connected with a water inlet of a steam drum, and the bottom of the water jacket is connected with a water outlet of the steam drum; a circular coal seam gas pipe and a water spray pipe are arranged in the furnace body.By using the device to deoxygenate coal seam gas, H2 produced in coal pyrolysis and water gas reaction is made full use in deoxygenation, the coal seam gas enters the furnace body through upper and lower paths, coal seam gas treatment quantity is high, deoxygenation temperature is effectively controlled, oxygen content of the coal seam gas is decreased to below 0.5%, methane splitting can be reduced maximally, and methane loss is below 5%.

Description

technical field [0001] The invention belongs to the field of coal gas deoxidation, and in particular relates to a fixed bed coal bed gas non-catalytic deoxidation device and method. Background technique [0002] Coalbed methane, commonly known as coal mine gas, is a gas resource that is associated and symbiotic with coal. The main component is methane, and it also contains a certain amount of carbon dioxide, nitrogen and oxygen. It is an unconventional natural gas. Coalbed methane is explosive and is the main cause of accidents in coal mines. In fact, coalbed methane is also a kind of energy with high calorific value and no pollution. It can be used in various industries such as power generation, industry, and chemical industry, and can also be directly used in residents' lives. Methane is a greenhouse gas, and its greenhouse effect is more than 20 times that of carbon dioxide. If coalbed methane can be used reasonably, it can make up for energy shortages, and the recycling...

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Problems solved by technology

The side wall of the furnace body of the device in this patent is equipped with a water jacket, which can well control the temperature in the furnace; the lower part of the furnace body adopts a water seal device to prevent the coalbed gas from overflowing from the bottom of the device; the process in this patent adopts reflux Part of the deoxidized and cooled CBM is transferred to the CBM before deoxidation, which can well adjust the oxygen content in the deoxidized CBM; however, the device and process of this patent still have deficiencies: the cooling effect of the water jacket is not very good, and the furnace The temperature inside the furnace is not uniform, and the temperature in the center of the furnace body may be too high, resulting in the loss of methane cracking; another shortcoming in this patent: the consumption of deoxygenation fuel in the process of non-catalytic deoxidation of coal bed methane by using this device is large, and the coal heat The solution process produces a large amount of H 2 , which brings separation difficulties for subsequent processing, and high investment in equipment

[0009] Most of the existing fixed bed devices are designed for coal gasification, and they have some disadvantages when used for non-catalytic deoxidation of coal bed methane: 1) The height and diameter are relatively large, and the gas stays in the furnace for a long time, resulting in serious methane loss; 2) The device is Adiabatic, without cooling measures, unable to remove too much heat in the device in time, resulting in too high temperature in the reactor, resulting in a large amount of methane cracking and serious loss; H 2 , subsequent separation is difficult, and equipment investment is high

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