Vacuum pressure swing adsorption system running under stable pressure and process thereof

Abstract

The invention discloses a vacuum pressure swing adsorption system running under a stable pressure and a control process thereof. The system comprises three sets of adsorption towers, fans and vacuum pumps, each set of adsorption towers consists of two adsorption towers, and each adsorption tower circulates according to the running mode of adsorption, primary even pressure drop, secondary even pressure drop, vacuum desorption, secondary even pressure rise, primary even pressure rise and feeding. The system adopts a six-tower process, through optimal control of the process itself, two pressure equalizing is adopted in adsorption and vacuum desorption processes, and compared with the existing two-tower to five-tower process, the fluctuation range is reduced due to one more pressure equalizing, thus solving the pressure fluctuation problem of the system itself, the problems of fan outlet pressure fluctuation and vacuum pump pressure fluctuation can be solved, and the system can operate stably.

Description

technical field [0001] The invention relates to a vacuum pressure swing adsorption system with stable voltage operation and its control process, in particular to a vacuum pressure swing adsorption system and its control process capable of overcoming pressure fluctuations in the system itself through process flow control, and belongs to the field of pressure swing adsorption. Background technique [0002] Vacuum pressure swing adsorption (VPSA) is a commonly used process for separating or purifying gas mixtures. Its basic principle is to use the selectivity of adsorbents for gas adsorption. The adsorbent will adsorb and purify the mixed gas, and the purified gas will be discharged. After the adsorption is completed, it will be analyzed under vacuum, so that the adsorbed components can be separated from the corresponding adsorbent, and the adsorbent can be recycled. [0003] The existing VPSA oxygen production system mostly adopts 2 to 5 tower processes, and the pressure fluct...

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Problems solved by technology

[0004] The present invention aims to solve the process fluctuation problem of the vacuum pressure swing adsorption system, and provides a vacuum pressure swing adsorption system with stable pressure operation. The system is a six-tower process. Once, so the fluctuation range is reduced, which can be used to solve the problem of pressure fluctuation at the outlet of the fan and the pressure fluctuation of the vacuum pump

[0005] Another object of the present invention is to provide a control process for a vacuum pressure swing adsorption system with stable pressure operation. Through the optimization control of its own process, the secondary pressure equalization is used in the adsorption and vacuum analysis process to solve the pressure fluctuation of the system itself. problem and keep the system running smoothly

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