JPH0621537Y2 - Booster for oxygen production - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has a concentration of oxygen gas separated from air by a PSA method, which is a separation method utilizing an adsorption action due to a pressure difference of an adsorptive substance, at a concentration higher than a predetermined value. The present invention relates to a pressure increasing device that pressure-feeds a high-pressure tank while maintaining it.

[Prior Art and Problems] An apparatus for separating oxygen gas from the air fed into a blower B and storing it in a receiver tank R by an adsorption tower A filled with a porous adsorbent such as zeolite is known. As shown in FIG. 2, a compressor C is connected to the receiver tank R so that the high-pressure oxygen gas is stored in the high-pressure tank T.

However, in the above apparatus, the gas pressure in the receiver tank R is gradually reduced by driving the compressor C, and even the gas that has not sufficiently undergone the adsorption process in the adsorption tower may be forced out. On the other hand, as a drawback of the air separation device by the PSA method, there is a problem of a decrease in concentration at the time of start-up or a fluctuation in production amount and concentration due to a change in temperature in daytime, summer and winter, and a pressure booster capable of covering this defect. Development was desired.

[Means for Solving Problems] An adjustment tank M is provided after the receiver tank R, which was only a gas reservoir, and the drive stop of the compressor C can be automatically controlled by the pressure change and the concentration change of this tank. That is, the compressor is automatically stopped when the pressure in the tank M reaches a predetermined lower limit or the concentration reaches a predetermined level or less, and is started when the pressure reaches a predetermined upper limit or the concentration. This prevents excessive intake of air from the receiver tank R. Further, by controlling the fluctuation of the flow rate and concentration of the production gas from the PSA device with the adjusting tank M, the gas of a predetermined concentration can be accumulated in the high pressure tank T.

[Example] FIG. 1 will be described. An oxygen production apparatus S composed of a blower B, an adsorption tower A and a receiver tank R, an adjustment tank M, a gas compressor C and a high pressure tank T are connected in this order by pipes. An oxygen concentration meter N and a pressure switch P are attached to the adjustment tank, and a solenoid valve V1 that can release or close the gas in the tank to the atmosphere is also provided. Further, a check valve V3 is provided in the passage to the bypass solenoid valve V2 and the high pressure tank T so that the compressor is not overloaded at the time of startup.

The air sent by the blower B is sent to the tank M after the oxygen gas is separated and concentrated in the adsorption tower A and stored in the receiver tank R, but the oxygen concentration meter N reaches a predetermined concentration (around 93%). Solenoid valve V1 is opened until
The gas is released to the outside world.

When the oxygen gas from the receiver tank R reaches a predetermined concentration, the solenoid valve V1 is closed. The gas pressure in the tank M gradually rises, and the compressor C is started when it reaches a predetermined upper limit (around 0.5 atm). Bypass solenoid valve V when starting the compressor
2 opens and closes after a few seconds to start boosting air supply to the high-pressure tank T. As a result, the pressure in the adjusting tank M gradually decreases, but when it reaches a predetermined lower limit (around 0.1 atm),
The compressor C is stopped and the bypass solenoid valve V2 is opened. The pressure of the tank M starts to rise again, and finally the compressor C is started. By repeating the above operation, the pressure in the tank T increases, and when it reaches a predetermined value (around 9 atmospheres), the compressor C is stopped and the bypass solenoid valve V2 is also opened. At this time, the oxygen production apparatus S can be stopped if necessary.
The oxygen concentration in the tank M is detected even during these pressure controls. When the oxygen concentration is below the predetermined concentration, the compressor C is stopped and the solenoid valve V1 is opened.

It is easy to electrically control that the compressor C is driven or stopped depending on the upper and lower limits of the pressure of the tank M and the oxygen gas concentration in the tank M, and is stopped at the upper limit of the pressure of the high pressure tank. On the other hand, the bypass solenoid valve V2 and the check valve V3
The combined use of the two reduces the overload at the time of starting the compressor and reduces the power consumption.

[Effect] As described above, in the present invention, the pressure and oxygen gas concentration in the adjustment tank M and the drive of the compressor C are organically related, so that the receiver tank R is not excessively sucked, and the oxygen gas in the adjustment tank is It is possible to increase the pressure while maintaining the concentration at a substantially constant value or higher. Therefore, the gas in the high-pressure tank T also has the required concentration.

[Brief description of drawings]

FIG. 1 is a layout view of each device of the present invention, and FIG. 2 is a layout view of a conventional device. B ... Blower, A ... Adsorption tower, M ... Adjustment tank, C ...
... Compressor, T ... High pressure tank, N ... Oxygen concentration meter, R ...
… Receiver tank.

Claims (1)

[Scope of utility model registration request] 1. An oxygen production apparatus comprising an adsorption tower which is filled with an adsorptive substance and is capable of separating and delivering oxygen gas from air fed by a blower, and a receiver tank which stores the oxygen gas separated from the air. , An oxygen concentration meter and a pressure switch that can set the upper and lower limits are attached, an adjustment tank that stores oxygen gas after the oxygen concentration from the receiver tank exceeds a certain value, a gas compressor, and a pressure switch are attached. A pressure booster for oxygen production that is connected to a high-pressure tank by pipes in this order.