Full-temperature-range pressure-swing adsorption method for removing hydrogen sulfide from hydrogen rich gas source

Abstract

The invention discloses a full-temperature-range pressure-swing adsorption method for removing hydrogen sulfide from a hydrogen rich gas source and relates to the technical field of gas desulfurization and purification. According to the technical scheme of the invention, after the full-temperature-range pressure-swing adsorption and concentration process, most of H2S in hydrogen rich gas are removed, and then remaining H2S in hydrogen rich gas can be continuously and deeply removed through selecting the pressure-swing adsorption method or the one-time adsorption method. After that, the H2S-enriched desorbed gas is directly fed into a desulfurization and sulfur-production device, and the gas amount of the above gas is reduced by 80% compared with the gas amount of raw materials. Meanwhile, the circulation volume of the desulfurizing liquid is reduced, and the energy consumption of a machine pump is reduced at the same time. The desulfurization and sulfur-production device can adopt the sodium carbonate desulfurizing and sulfur-producing process or the Claus process, and H2S in the H2S-enriched desorbed gas is removed to be about 100 ppm. Elemental sulfur foams produced during the desulfurizing process are made into sulphur by means of a sulfur retrieving device.

Description

technical field [0001] The invention relates to the technical field of gas desulfurization and purification, and more specifically relates to a full temperature-range pressure swing adsorption method for removing hydrogen sulfide from a hydrogen-rich gas source. Background technique [0002] Hydrogen sulfide (H 2 S) It is a harmful impurity in natural gas, refinery gas, synthesis gas and other industrial gases. Its existence not only seriously threatens personal safety, but also causes corrosion of equipment and pipelines and catalyst poisoning, especially the large amount of hydrogen-rich dry gas produced by refining hydrogenation is often accompanied by H 2 S. The source of hydrogen required for hydrogenation is mostly recovered from hydrogen-containing dry gas for recycling, which can reduce the cost of hydrogenation and comprehensively utilize refinery dry gas. However, H in hydrogen-containing refinery dry gas 2 S, will poison the hydrogenation catalyst in the hydro...

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Problems solved by technology

However, the regeneration temperature should be increased, and must be selected with H 2 S non-reactive inert heat carrier or steam needs to consume a lot of regeneration gas and heat, especially H 2 When S is easy to precipitate elemental sulfur on the surface of the adsorbent at high temperature, it needs a high temperature above 400°C to completely regenerate

If you choose general heat carrier nitrogen (N 2 ) or water vapor, the hot nitrogen of the regeneration gas needs to be cooled, purified and recovered H 2 S, consumption increases; if steam is selected, H cannot be recovered 2 S, water vapor cannot be regenerated and recycled

At the same time, since the regeneration heating requires sufficient time, it is difficult to match the short adsorption time, making it difficult to effectively realize the cyclic process of TSA adsorption and regeneration.

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