Method and device for treating gas containing carbon dioxide and hydrogen sulfide

Abstract

The invention discloses a treatment method and device for gas containing carbon dioxide and hydrogen sulfide. The device includes a hydration reactor, a hydrate decomposer, a gas exhaust processor, a primary absorption reactor, a secondary absorption reactor and a product tank . Also provided is a method for treating gas containing carbon dioxide and hydrogen sulfide by using the above device. It can produce NaHS products that meet the national quality standards while achieving acid gas discharge standards, and organically combine environmental governance with the production process of chemical products into an integrated process. Compared with the prior art, the method of the present invention can economically and efficiently pretreat the gas containing carbon dioxide and hydrogen sulfide, rationally utilize the energy in the process, and greatly reduce energy consumption; the whole process is environmentally friendly, reliable, No "three wastes" are generated.

Description

technical field [0001] The invention relates to a treatment method and device for acid gas, in particular to the purification of acid gas containing carbon dioxide and hydrogen sulfide and the recovery and utilization of pollutant resources. Background technique [0002] Refinery acid gas is a kind of processing tail gas produced in the process of petroleum processing, and its main component is H 2 S and CO 2 . Refinery acid gas mainly comes from sour water stripping, circulating hydrogen desulfurization, dry gas and liquefied gas desulfurization and other devices. Large-scale refineries have a large amount of acid gas (annual sulfur output > 5000t / a), and generally build acid gas treatment devices for sulfur production (such as Claus process and LO-CAT process). 2 S for recycling. For small and medium-sized refineries (annual sulfur output <5000t / a), due to the small amount of acid gas, the cost of setting up sulfur facilities is relatively high. waste, and the c...

AI Technical Summary

Problems solved by technology

The two-stage Claus + tail gas hydrogenation reduction + solvent absorption technology is mature, and the quality of the product sulfur is stable. However, due to the long process, large investment, high energy consumption, high requirements for device safety control, and the Claus process can only handle high-concentration acid gases, so , this technology has no advantages for sour gas treatment in small refineries

Refinery acid gas contains H 2 In addition to S gas, it also contains a certain amount of CO 2 gas, during the production of soda sulfide, CO 2 The gas will produce Na with raw lye 2 CO 3 / NaHCO 3 Impurities cause blockage of process pipelines in the production process, resulting in the failure of long-term continuous operation of production equipment, and there are problems such as high alkali consumption and poor product purity.

[0007] Patents CN102765700A and CN102807193A disclose NaHS production process and NaHS continuous absorption reaction production device with two-stage absorption, one-stage alkali protection and one-stage adsorption process, acid gas and alkali agent adopt countercurrent absorption method, and finally the solution is evaporated, concentrated and dehydrated, cooled Molding, packaging process, to complete the generation process of NaHS, this technology is only applicable to the pure hydrogen sulfide absorption process, and does not consider CO 2 Effect of gas

CN103551018A discloses a method for purifying and recycling sulfur-containing tail gas, using barium sulfide to treat CO in the gas 2 Removed to obtain H 2 S gas can produce high-quality NaHS products, but it produces barium sulfite and barium carbonate precipitates, which are difficult to handle

Patent CN103754833A discloses a device and method for producing NaHS using refinery dry gas, using supergravity technology to perform selective desulfurization on dry gas to obtain 99% H 2 The purity of NaHS produced by S gas can reach more than 42%, but the raw material gas pretreatment process of this technology is long, the production equipment is complex, and the energy consumption of regeneration of rich absorption liquid is high

The NaHS production technology described in CN103446849A, CN103466559A and CN103638802A also faces the problems of complicated process, high energy consumption of amine liquid regeneration in acid gas pretreatment, etc.

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