Fine desulfurization device and method

Abstract

The invention discloses a fine desulfurization device and method, and belongs to the technical field of desulfurization. In the device, a normal-temperature COS hydrolysis catalyst bed layer is arranged in a COS hydrolysis reactor; an adsorption reactor is filled with a high-temperature COS hydrolysis catalyst bed layer, an upper molecular sieve adsorbent bed layer and a lower molecular sieve adsorbent bed layer from top to bottom. A top inlet of the COS hydrolysis reactor is communicated with a raw material natural gas conveying pipeline, and a bottom outlet is communicated with a hydrolysis gas conveying pipeline; a top opening of the adsorption reactor is simultaneously communicated with a purified gas conveying pipeline, a regenerated gas conveying pipeline and a cooling gas conveying pipeline which are connected in parallel; an opening in the bottom of the adsorption reactor is simultaneously communicated with a hydrolysis gas conveying pipeline, a regenerated raw material gas conveying pipeline and a cooled gas conveying pipeline which are connected in parallel; a heat exchanger tube pass is communicated with the regenerated gas conveying pipeline and a regenerated gas discharging pipeline; and a heat exchanger shell pass is communicated with the cooled gas conveying pipeline and the regenerated raw material gas conveying pipeline. According to the device, COS is deeply removed, and the treatment difficulty of regenerated gas is reduced.

Description

technical field [0001] The invention relates to desulfurization technology, in particular to a fine desulfurization device and method. Background technique [0002] The raw natural gas extracted from the formation usually contains more carbon dioxide, sulfur compounds and water, wherein the sulfides include hydrogen sulfide and organic sulfur (mercaptan, carbonyl sulfide, etc.). According to the current natural gas standard, the hydrogen sulfide content in the product natural gas is required to be ≤6mg / m 3 , total sulfur content≤20mg / m 3 . At present, raw natural gas is generally treated with desulfurization and decarbonization processes to increase the concentration of regenerated acid gas. In order not to affect the stable operation of the sulfur recovery unit and realize the deep removal of organic sulfur, it is necessary to carry out fine sulfide removal (referred to as fine desulfurization) treatment at the back end of the desulfurization and decarbonization process....

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Problems solved by technology

[0004] Due to CO 2 The polarity of COS (carbonyl sulfide) is equivalent, and the raw natural gas after conventional desulfurization and decarbonization treatment generally contains 1%-3% volume concentration of CO 2 , while the COS content is often lower than 100ppm, and the partial pressure is relatively low. Therefore, it is difficult to achieve selective deep removal of COS by using molecular sieve adsorbents.

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