A pressure swing adsorption method for pressure change linkage control in cycle operation

Abstract

The invention discloses a pressure-swing adsorption method for coupling control of pressure change in cyclic operation and relates to the technical field of pressure-swing adsorption gas-separation technologies. The pressure-swing adsorption method comprises the following steps: carrying out simulation on the cyclic operation process of adsorption and desorption of a pressure-swing adsorption system to determine a mechanical designation mode, an autonomous judgment mode and a mechanical-autonomous combining mode by boundary conditions of an inlet and an outlet of an adsorbing tower in simulation, wherein the pressure-swing adsorption system consists of one or more groups of adsorbing tower sections consisting of at least two adsorbing towers; and carrying out coupling control on the determined control mode and combination of a program control valve and an adjusting valve, by adopting instantaneous pressure in two or more target adsorption towers as basis, adjusting opening and closing as well as opening degree of valve combination, carrying out instantaneous coupling control on gas flowing speed and pressure change trend in the target adsorption tower and the inlet and outlet so as to increase the composition and pressure of raw gas of a pressure-swing adsorption device and the fault tolerance of pressure change of each step in the cyclic operation process of adsorption and desorption of pressure-swing adsorption.

Description

technical field [0001] The invention relates to the technical field of pressure swing adsorption gas separation technology, in particular to a pressure swing adsorption method for pressure change linkage control in cycle operation. Background technique [0002] Pressure Swing Adsorption (PSA for short) refers to, at a certain temperature, through the cyclic process of pressure adsorption and decompression (vacuumization) or normal pressure desorption or flushing replacement regeneration, the mixture gas is separated, purified and separated. purify. It can be seen that PSA achieves the purpose of adsorption and desorption by changing the pressure or pressure change. Adsorption is often carried out in a pressure environment. Pressure swing adsorption proposes a method of combining pressure and decompression. At a certain temperature, it is usually an adsorption-desorption (regeneration) process consisting of pressure adsorption and decompression regeneration. Loop operating ...

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Problems solved by technology

[0008] The present invention provides a pressure swing adsorption method of pressure change linkage control in cycle operation to solve the gap between the boundary condition setting of the inlet and outlet of the adsorption tower and the connection between the adsorption tower and the deviation between the traditional PSA process design and the actual operation. The program control valves on the inlet and outlet pipelines that only function to open and close are not linked, resulting in poor adaptability to raw gas fluctuations, high investment costs and poor stability caused by excessive pressure equalization times used to increase yields, and some industrial processes. However, there are technical problems such as double drop of "yield and purity", shortened service life of adsorbent and high failure rate of program control valve

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