Moderate temperature pressure swing adsorption method for CO2, H2S and H2 mixed gas separation

Abstract

The invention discloses a moderate temperature pressure swing adsorption method for CO2, H2S and H2 mixed gas separation, and belongs to the technical field of clean energy. The method of the invention conducts raw material gas separation under a moderate temperature without cooling and can recover raw material gas sensible heat, raise integral system heat efficiency, reduce system heat exchange equipment and lower system costs. Moderate temperature operation of the invention can effectively enhance adsorbent kinetics characteristics of adsorption and desorption and increase gas processing capability of the PSA system; meanwhile, simultaneous removal of CO2 and H2S components in the raw material gas is realized to reduce system equipment and system complexity; when the raw material gas only contains CO2 or H2S, individual removal of the CO2 or H2S from the raw material gas can be realized.

Description

technical field [0001] The invention belongs to the technical field of clean energy, in particular to a CO 2 、H 2 S and H 2 A medium temperature pressure swing adsorption method for the separation of mixed gases. Background technique [0002] At present, there are many kinds of H 2 S, CO 2 Staged removal to realize CO 2 / H 2 The traditional process route of separation is mainly normal temperature or low temperature wet method (such as Selexol / NHD technology, active MDEA technology, low temperature methanol washing technology) and pressure swing adsorption technology (PSA). The above technologies have been widely used in the energy and chemical industries . Selexol / NHD technology, low-temperature methanol washing technology and active MDEA technology are collectively referred to as solvent absorption method, which is a mature and applied decarburization method. The active MDEA technology is a chemical absorption method, the principle of which is: MDEA liquid is mixed ...

AI Technical Summary

Problems solved by technology

[0004] At present, the PSA gas separation method has been widely used in natural gas, coal-fired boiler flue gas, synthetic ammonia shift gas, roasting tail gas in alumina production, and CO in lime kiln gas. 2 This method overcomes the disadvantages of wet decarbonization, complex operation in desulfurization, high energy consumption, high cost, and large equipment corrosion.

However, the traditional PSA adsorption separation process is limited by the adsorbent and equipment working conditions, and often can only be operated at room temperature (such as 20-45 ° C), and the gas temperature needs to be lowered first, resulting in waste of sensible heat of the raw material gas, high energy consumption for regeneration, and steam and electric energy. Consumption respectively accounts for a higher proportion of the total operating costs

At the same time, common PSA adsorbents (such as molecular sieves) for H 2 The presence of O is also very sensitive, in the H 2 When O coexists with other gases, it will preferentially absorb H 2 O, so it is often necessary to increase the gas drying link in the adsorption separation system, which increases the equipment investment and also causes the loss of water vapor

In addition, traditional CO 2 / H 2 The separation process uses H 2 S, CO 2 Sectional removal increases system complexity and investment cost

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