Dual-tower molecular sieve dehydration system for natural gas

Abstract

The invention discloses a dual-tower molecular sieve dehydration system for natural gas. The dual-tower molecular sieve dehydration system comprises a natural gas dehydration pipeline and a regenerated gas recovering pipeline; a molecular sieve drier is arranged as a joint of the natural gas dehydration pipeline and the regenerated gas recovering pipeline; the regenerated gas recovering pipeline comprises a heat exchanger; the heat exchanger is arranged between a condensation separator and the molecular sieve drier; a regenerated gas inlet end passes through the heat exchanger and then enters a regenerated gas heater; a regenerated gas recovery tank is provided with a H2S content detector; the regenerated gas recovering pipeline is provided with a first valve; two desulphurization pipelines are led out from two ends of the first valve and connected with a desulfurization tower, and the desulphurization pipelines enters from the bottom of the desulfurization tower and extends from the top of the desulfurization tower to the regenerated gas recovering pipeline; and the desulphurization pipelines are provided with a second valve and a third valve. The dual-tower molecular sieve dehydration system provided by the invention aims to overcome the problem that proneness to sulfur enrichment in regenerated gas of a conventional natural gas dehydration system influences the quality of regenerated gas and equipment safety, and improves the efficiency of energy utilization.

Description

Technical field [0001] The invention belongs to the field of natural gas dehydration equipment, and specifically relates to a double-tower molecular sieve natural gas dehydration system. Background technique [0002] In the current natural gas chemical industry, before petroleum gas and compressed natural gas are put into use, the gas is generally purified. These treatments are a series of chemical or physical reaction processes. There will be a step of dehydration at the end of these processes. The process is mainly used to remove the water in natural gas. If the natural gas contains too much water, it may corrode pipelines and equipment and cause ice blockage of the equipment. Therefore, the natural gas must be dehydrated before being put into use. The method is to use double-tower molecular sieve to adsorb moisture in natural gas. After the molecular sieve dryer of the double-tower molecular sieve absorbs a certain amount of moisture, the heated regeneration gas is passed into...

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems, the present invention provides a double-tower molecular sieve natural gas dehydration system to solve the problem of H 2 The enrichment of S gas affects the quality of regeneration gas and the safety of equipment. The function and recovery system of regeneration gas i...

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