Pressure-boosting system based on opening degree control of on-off valve in molecular sieve drying

Abstract

The invention relates to a boost-buck system based on opening control of a switch valve in molecular sieve drying. Each of a first control valve and a second control valve comprises a switch valve and a pneumatic membrane head for controlling opening and closing of the switch valve, wherein one end of each switch valve is connected with a molecular sieve tower; the other end of each switch valve is connected with a natural gas inlet pipe or a regeneration gas outlet main pipe; diaphragms of the pneumatic membrane heads are connected with valve cores of the switch valves by valve rods; valve location sensors are arranged on the valve rods; output ends of the valve location sensors are electrically connected with valve location signal input ends of valve location control modules; pressure signal input ends of the valve location control modules are electrically connected with pressure transmitters; gas ports of upper gas chambers and lower gas chambers of the pneumatic membrane heads are connected with switch control electromagnetic valves by switch / opening change-over mechanisms; the upper ends of the valve rods penetrate through the pneumatic membrane heads and are connected with opening control mechanisms; and control signal input ends of the switch / opening change-over mechanisms and the opening control mechanisms are electrically connected with control signal output ends of the valve location control modules. The system cancels six boost-buck branches as well as switch valves and pore plates on the branches, and saves funds greatly.

Description

technical field [0001] The invention relates to a pressure-reducing and pressure-boosting control system in the regeneration process of molecular sieves in gas dry noise treatment. In particular, it relates to a pressure-boosting system based on controlling the opening of an on-off valve in molecular sieve drying. Background technique [0002] Molecular sieve drying is an indispensable process in many gas processing. Dry molecular sieves (adsorbents) can easily absorb moisture from the surrounding medium (adsorbate). The result of this process is to reduce the "surface free energy" originally possessed by the adsorbent itself, and this process can proceed spontaneously. The saturated molecular sieve that has absorbed water must be heated and regenerated to release the absorbed water and restore its "surface free energy". The regeneration process is mainly to first reduce the pressure of the drying tower to a certain pressure at a constant speed, and then pass through the h...

AI Technical Summary

Problems solved by technology

[0006] In the figure, in order to ensure the safety of the equipment and molecular sieve, the maximum (initial) flow rate in the step-up and down-pressure process must be controlled not to be higher than 0.3MPa / min. The time of pressing is prolonged, and the production efficiency is reduced.

Moreover, the buck-boost process of the current control method must be completed through a dedicated branch for buck-boost.

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