Device and method for acid gas concentration, desalination and separation after regeneration of desulfurization liquid

Abstract

The invention belongs to the technical field of gas separation and water treatment, in particular to a device and method for acid gas concentration, desalination and separation after doctor solution regeneration. The device comprises a regeneration tower, a one-way gas valve, a water cooler, a knockout drum, a one-way liquid valve, a corrosion-resistant liquid pump, a reboiler, a compressor, a pressure control valve, a hydrate reaction unit, a stop valve, a slurry pump, a hydrate decomposition unit, a filter unit, a two-way liquid valve, an ice-making device, a grinding device, a water pump, a refrigerator and a hydrate and salt separation unit. Two hydrate reactors are adopted to respectively fix hydrogen sulfide or carbon dioxide released after the doctor solution regeneration, the enrichment concentrations of two gases are increased, the quality of subsequent sulphur preparation is improved, and cost is saved; by the utilization of the desalination effect in the hydrate forming process, thermal stable salts generated in the desulfuration and regeneration process of most of the doctor solution can be removed, loss of desulfurizer in the doctor solution is little, and most of the desulfurizer can be recycled.

Description

technical field [0001] The invention belongs to the technical field of gas separation and water treatment, and specifically refers to a device and method for acid gas enrichment, desalination and separation after desulfurization liquid absorbing hydrogen sulfide and carbon dioxide in natural gas is regenerated in a regeneration tower. Background technique [0002] Natural gas extracted from oil and gas fields needs to be desulfurized and deacidified to meet pipeline transportation standards. Currently, the methods used for desulfurization of natural gas mainly include chemical-physical solvent method, direct conversion method, molecular sieve method, membrane separation method, etc. Among them, the chemical-physical solvent method is due to It has the advantages of fast absorption rate, large processing capacity, and high removal rate of hydrogen sulfide and carbon dioxide, and is the most commonly used method in practice. [0003] There are generally two processes for desul...

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Problems solved by technology

Process simulation and optimization of solvent regeneration unit [J]. Zhongwai Energy, 2011, 16(9):86-89.) and others have also elaborated on this aspect; this is also a relatively common treatment method for desorbed gas at present , but usually, a large-scale oil and gas field or some small marginal gas fields have more than one set of natural gas desulfurization devices. The desulfurization devices are generally arranged near the main device, but the matching sulfur recovery devices are located The "farther" location and the sulfur recovery process have requirements for the concentration of hydrogen sulfide. High-concentration hydrogen sulfide can not only produce higher-quality sulfur but also save a lot of cost. In addition, the desulfurization liquid has a stable Therefore, it is urgent to develop a sour gas treatment and separation device after desulfurization liquid regeneration that can solve these problems, so as to facilitate the efficient regeneration of desulfurization liquid and subsequent sulfur production

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