A method and system for determining optimal adsorption time of pressure swing adsorption

Abstract

The invention discloses a method and a system for determining the optimal adsorption time of pressure swing adsorption. The method comprises the following steps of: according to the requirements of the adsorption equilibrium equation, the mass transfer rate equation and the total mass transfer equation, and according to the design parameters and the operation parameters of the pressure swing adsorption device, setting the initial values of the parameters required for each process; establishing Mathematical simulation model of pressure swing adsorption device; mathematically solving the mathematical simulation model; Judging whether the hydrogen composition and flow rate of the product in the solution result meet the preset calculation requirements, and if not, modifying the initial value of the adsorption equilibrium kinetic parameter; If the preset calculation requirement is satisfied, establishing a nonlinear programming model of the pressure swing adsorption device, and solving thenonlinear programming model to obtain the optimal adsorption time of the pressure swing adsorption device. The invention can determine the optimal adsorption time of the pressure swing adsorption device on the premise that the hydrogen recovery quality, efficiency and the adsorbent are not polluted.

Description

technical field [0001] The invention relates to the technical field of gas adsorption, in particular to a method and system for determining the optimal adsorption time of pressure swing adsorption. Background technique [0002] Pressure swing adsorption is the most important means for refineries to obtain high-purity hydrogen. It mainly uses the principle of "adsorption at high pressure and desorption at low pressure" for impurity components in hydrogen-containing streams to enrich hydrogen. The pressure swing adsorption adsorption tower is a composite bed of various adsorbents. Usually, activated alumina, silica gel, activated carbon, and various types of molecular sieve adsorbents are filled sequentially from the bottom of the tower to the top of the tower. According to the different raw materials to be processed, each The types and proportions of the two adsorbents are slightly different. Among them, the alumina-based adsorbent has a 2 O, H 2 S and other components have...

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Problems solved by technology

The determination methods of the adsorption time involved in the above two methods are based on the simple correlation between the inflow and outflow logistics information of the adsorption tower and the adsorption time. The relationship between the adsorption time and each adsorbent layer has not been investigated in depth, and the optimal adsorption time cannot be essentially demonstrated and obtained.

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