Pressure swing adsorption gas separation energy-saving technique

Abstract

The invention relates to a separation energy saving technology for pressure-swing adsorption gas; feed gas is dried by apyretic regenerating drying equipment; each of drying towers of the drying equipment works for regenerating periodically and alternately; the dried feed gas is separated by a pressure-swing adsorption plant so as to produce finished gas; each of adsorption towers of the pressure-swing adsorption plant also works for regenerating periodically and alternately; a blow-down tail gas produced by the adsorption tower in a regenerating state and resurgent gas regenerated by blowing conversely the finished gas to the adsorption tower are all conducted to the drying tower in the regenerating state for regenerating to the drying tower; and the regenerated gas is discharged. By using the technology of the invention, PSA plant and the apyretic regenerating drying equipment are joined together to be used; the waste gas produced by the regenerating adsorption tower of the PSA plant is utilized to regenerate to the drying tower without consuming the qualified feed gas, thereby reducing the drying energy consumption greatly, improving the quality of the dried feed gas and decreasing the energy consumption cost of the entire gas separation technology.

Description

Technical field: [0001] The invention relates to a pressure swing adsorption gas separation process. Background technique: [0002] The pressure swing adsorption equipment used in the pressure swing adsorption gas separation process, that is, the molecular sieve of the PSA equipment, has high requirements on the quality of the raw material gas, especially the control of the water content and oil content of the raw material gas. The commonly used freeze dryer cannot deeply remove water, but the heatless regeneration drying equipment that can deeply remove water, that is, the drying tower of the adsorption dryer needs to be regenerated, the amount of regeneration gas is large, and the drying energy consumption is large, which makes the whole PSA process. The cost of energy consumption is greatly increased. Invention content: [0003] In view of the deficiencies of the prior art, the present invention provides a pressure swing adsorption gas separation energy-saving process ...

AI Technical Summary

Problems solved by technology

Generally used freeze dryers cannot remove water deeply, but the heatless regenerative drying equipment capable of deep water removal, that is, the drying tower of the adsorption dryer needs to be regenerated, the amount of regeneration gas is large, and the drying energy consumption is large, making the entire PSA process The cost of energy consumption is greatly increased

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