Introduction to the Application Scope of Programmed Control Valves
2021.03.27
Requirements for Program-Controlled Valves in the PSA Process
PSA is a physical process with approximately isothermal changes. It uses the difference in adsorption capacity of different components in a gas medium on adsorbents to perform selective adsorption under certain operating conditions, and regenerates the adsorbent through pressure reduction.
Periodic valve switching is required during production, with a large number of valves and frequent actuations, which cannot be achieved by manual operation.
Due to the special process characteristics of PSA units, program-controlled valves must meet the following requirements to ensure long-term, stable and reliable operation:
1. Excellent sealing performance, maintaining zero leakage despite frequent cyclic actuations.
2. Fast valve opening and closing speed; the actuation time shall be less than 3 seconds depending on the valve size.
3. Bidirectional pressure resistance and resistance to scouring by high-speed gas flow.
4. Easy to realize regulation functions, on-site indication and remote transmission of valve position status according to process requirements.
Functions of Program-Controlled Valves in PSA Units
A PSA unit is a highly automated system. Each adsorption tower must undergo processes including Adsorption (A), First Equalization Depressurization (1L), Cocurrent Depressurization (PP), Second Equalization Depressurization (2L), Countercurrent Depressurization (L), Purge (P), Second Equalization Pressurization (2H), and Final Recharge (FH).
These process steps are accomplished through the switching of program-controlled valves.
In this sense, program-controlled valves act as the **heart** of the unit, opening and closing frequently, stably and sequentially to ensure smooth process operation and continuous, stable output of products.
The above information is compiled and released by Suzhou Jiarui Gas, a supplier of natural gas hydrogen production units.
Suzhou Jiarui Gas System Co., Ltd. is a high-tech enterprise specializing in the research and development of gas separation and purification technologies.
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