Multi-tower type ventilation air methane temperature swing adsorption concentration device

Abstract

The invention discloses a multi-tower type ventilation air methane temperature swing adsorption concentration device. The multi-tower type ventilation air methane temperature swing adsorption concentration device comprises a ventilation air methane inlet pipe, a hot flue gas pipe, a sweeping gas inlet pipe, a ventilation air methane outlet pipe, a desorption gas outlet pipe, a sweeping gas outlet pipe and at least three adsorption towers, wherein a first pipe joint and a second pipe joint are formed in each adsorption tower, and a methane adsorption device is arranged between the first pipe joint and the second pipe joint in each adsorption tower. By virtue of a multi-adsorption-tower structure, the quantity of the combined adsorption towers can be selected according to the flow size of ventilation air; according to the characteristics of normal-temperature methane adsorption and high-temperature methane desorption of the methane adsorption devices, ventilation air methane can be concentrated through a temperature swing adsorption process; the methane desorption can be realized through waste heat flue gas of a subsequent heat storage oxidization device, and a system is low in energy consumption. Each adsorption tower in the device has cyclic functions of normal-temperature adsorption, heating desorption and cooling regeneration. The whole device is high in utilization rate and high in methane concentration capacity.

Description

technical field [0001] The invention relates to a kind of gas concentration equipment, in particular to a kind of concentration equipment for exhaust gas. Background technique [0002] Coal mine ventilation gas, also known as exhaust gas, has low methane content and is directly discharged into the atmosphere due to lack of effective utilization methods. About 80% to 90% of the annual gas emissions from coal mines in my country are discharged through mine ventilation. According to relevant statistics, in 2008, the amount of methane discharged into the atmosphere through exhaust air has reached 16.1 billion cubic meters. Another study shows that the greenhouse effect of methane is about 21 times that of carbon dioxide, which is extremely destructive to the ecological environment. Therefore, recycling exhaust gas has dual meanings of energy saving and environmental protection. [0003] The volume fraction of methane in exhaust air is very low, and the concentration of exhaus...

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Problems solved by technology

[0004] At present, only a few units are conducting research on the adsorption and concentration of coal mine exhaust air gas. The patent literature discloses "methane enrichment and utilization method in mine exhaust air" (200910187318.4), "separation and adsorption device for low-concentration methane gas" (200920203210.5) All adopt the method of pressure swing adsorption to concentrate the exhaust air gas. The disadvantage of the pressure swing adsorption method is the frequent pressure boost adsorption and high energy consumption, which is not conducive to the economic operation of the overall system.

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