Movable skid-mounted natural/coal bed gas adsorption and purification system with external medium heat exchange function

Abstract

The invention relates to a movable skid-mounted natural / coal bed gas adsorption and purification system with an external medium heat exchange function, which comprises an adsorption tower system and a heat conduction medium heating circulation and cooling circulation system. The adsorption tower system consists of three adsorption towers which are connected in parallel and are switched to be started; one tower is used for adsorption, another tower is used for heating desorption and the third tower is used for cooling; in the heating desorption process, an adsorbent is heated by a high temperature heat conduction medium which is from external circulation so as to be rapidly heated and desorbed, and simultaneously, a small volume of purified process gas is used as regenerated gas to take away impurities generated in the desorption process; and in the cooling process, the adsorbent is cooled by a low temperature heat conduction medium which is from external circulation, so that the temperature of the adsorbent is rapidly reduced and the regeneration process is completed. Regeneration time of the adsorbent can be shortened; consumption of the regenerated gas is reduced; meanwhile, adsorption period is reduced and the heights of the adsorption towers are reduced; and the adsorption and purification system is miniaturized.

Description

technical field [0001] The invention relates to an adsorption and purification system for natural gas / coal bed methane, mainly relates to a mobile skid-mounted natural / coal bed gas adsorption and purification system with external medium heat exchange, which is applied to the deep purification of natural gas / coal bed gas before liquefaction. Background technique [0002] Natural gas / coal bed methane must be deacidified and dehydrated before liquefaction. The widely used methods in the field of natural gas / coal bed methane purification mainly include molecular sieve adsorption method, alcohol amine method, improved hot potassium method, sulfone amine method, etc. At present, large-scale coalbed methane liquefaction plants generally adopt the method of alcohol amine deacidification + molecular sieve deep dehydration, while the alcohol amine method involves towers such as absorption towers and regeneration towers. The absorption towers and regeneration towers are relatively high...

AI Technical Summary

Problems solved by technology

figure 1 Defects of the three-tower scheme shown: Although the three-tower scheme can complete the regeneration of the adsorbent, when the purified gas is used as the regeneration gas, the gas is mainly used to heat the adsorbent and the tower body to the desorption temperature, so the regeneration gas consumption is relatively large

And under a certain pipe diameter, it takes a long time to heat the adsorbent to the required temperature, which also makes the switching cycle of the adsorption device longer, and it is difficult to miniaturize the adsorption device

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