Fluidized bed catalytic deoxidation method for oxygen-containing coal bed gas

Abstract

The invention relates to a fluidized bed catalytic deoxidation method for oxygen-containing coal bed gas. The fluidized bed catalytic deoxidation method comprises the following steps that: a fluidized bed deoxidation reactor is preheated to the temperature of 300-400 DEG C; the oxygen-containing coal bed gas is fed into the fluidized bed deoxidation reactor; deoxidation catalyst granules are loaded into a feed hopper and are added into the fluidized bed deoxidation reactor under the action of air blowing and supplying; methane and oxygen in the coal bed gas are subjected to low-temperature catalytic combustion reaction in the fluidized bed deoxidation reactor; the gas moves upwards with the carrying of part of solid catalyst granules and enters a one-stage cyclone separator and a two-stage cyclone separator from the top outlet of the fluidized bed deoxidation reactor, and the collected solid catalyst granules circularly enter the fluidized bed deoxidation reactor under the control of a feed back control valve and air blowing and supplying; and the deoxidated coal bed gas which is subjected to coarse dust removal by the cyclone separators is subjected to fine catalyst dust removal by a high-temperature filter, and then, is transferred to a follow-up system for use. The fluidized bed catalytic deoxidation method for the oxygen-containing coal bed gas has the advantages of good safety, low energy consumption, high deoxidation efficiency, long service life of catalyst and large processing capacity.

Description

technical field [0001] The invention relates to a fluidized bed catalytic deoxygenation method and equipment for oxygen-containing coal bed gas. Background technique [0002] my country is a big coal consumption country. In the process of coal mining, in order to ensure the safety of mine production, a large amount of low-concentration air-mixed coalbed methane is drained, the main component of which is methane (CH 4 ) and air. According to statistics, billions of cubic meters of coalbed methane are emitted from coal mining in my country every year, most of which are directly vented and burned, which not only wastes resources, but also aggravates the greenhouse effect of the atmosphere and causes environmental pollution. [0003] Low-concentration oxygen-containing coalbed methane contains 30-70% methane and 5-15% oxygen. It is flammable and explosive. The current main utilization methods are direct combustion and power generation, and its economic value has not been fully ...

AI Technical Summary

Problems solved by technology

Patents CN101139239A and CN101613627A disclose an adiabatic fixed bed coalbed methane deoxygenation reactor, which adopts the method of circulating partially deoxygenated methane-rich gas to reduce the relative oxygen content in coalbed methane, thereby reducing the relative heat release, so as to control the reaction temperature of the catalyst bed at Within an appropriate range, prevent local overheating and overheating, causing catalyst deactivation and sintering, but this also results in high energy consumption and low production intensity of the process

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