JPH0532183Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention dehumidifies untreated gas such as air containing moisture by passing it through an adsorbent such as silica gel, activated alumina, or molecular sieves. In particular, regarding the dehumidification device designed to perform
Untreated gas is alternately passed through two dehumidifying towers, and a portion of the treated gas that has been dehumidified through one dehumidifying tower is flowed to the other dehumidifying tower to remove moisture from the adsorbent therein and regenerate it. The present invention relates to a dehumidifying device.

Problems to be solved by conventional techniques and ideas Conventionally, such a dehumidifying device uses silica gel between a supply pipe that supplies untreated gas such as air containing moisture and a take-out pipe that takes out dehumidified gas. Two processing pipes, each with a dehumidifying tower filled with an adsorbent such as The pressurized untreated gas is alternately supplied to each treatment pipe for a fixed period of time by switching the switching valve installed upstream of the dehumidification tower of each treatment pipe. The dehumidified gas is passed through one dehumidification tower to be dehumidified and discharged to the take-out pipe, and a portion of the dehumidified gas is supplied to the other dehumidification tower through a bypass pipe under reduced pressure to dehydrate the adsorbent in that dehumidification tower. The amount of water contained in the gas per unit volume decreases in proportion to the pressure drop when the gas is expanded by _lowering the pressure. The amount R of the regeneration gas required to remove the moisture in the adsorbent adsorbed from the gas is R = P ₂ /P ₁ ×Q, assuming its pressure P ₂ , and therefore, the dehumidification on the regeneration side The tower contains dehumidified gas _P2 /
It is now necessary to supply only the amount of _P1 , and by switching the switching valve at regular intervals, it is possible to continuously dehumidify the untreated gas. However, when switching the switching valve, the high-pressure gas in the pipeline on the dehumidifying side is rapidly exhausted from the regeneration gas outlet, producing a loud exhaust noise. A silencer is connected to the outlet, but the regeneration gas flowing through the dehumidification tower contains a large amount of moisture removed from the adsorbent in the dehumidification tower and the adsorbent that has passed through the filter in the dehumidification tower. Contains fine particles, which can easily clog the silencer.
When the muffler becomes clogged, back pressure builds up in the pipeline on the regeneration side, reducing the regeneration efficiency of the adsorbent.In order to increase the regeneration efficiency, it is necessary to increase the opening of the throttle valve and increase the flow rate of the regeneration gas. However, in this case, the amount of treated gas taken out is reduced, resulting in a disadvantage that the efficiency of the dehumidification process is lowered.

Means for Solving the Problems The present invention, as a means to solve the above-mentioned problems, uses a switching valve that normally discharges the exhaust gas into the atmosphere and connects it to the exhaust pipe that leads the exhaust gas used for regeneration to the muffler. The structure includes a normally open relief valve that closes due to the rise in exhaust gas pressure that occurs when the switch is activated.

Functions and Effects of the Invention The dehumidifying device of the invention has the above-mentioned configuration, and in the steady state where the exhaust gas used for regeneration is discharged at low pressure, most of it is exhausted from the relief valve, and when the switching valve is switched, the exhaust gas is released under high pressure. When the exhaust gas is emitted, all of it passes through the muffler, but in a steady state, most of the exhaust gas is emitted without passing through the muffler, so the exhaust gas Therefore, even if the muffler becomes clogged, the regeneration efficiency of the adsorbent will not be reduced due to excessive back pressure being applied to the pipe on the regeneration side, and the efficiency of the dehumidification process will be improved. In addition, since the amount of exhaust gas passing through the muffler is small, the muffler is prevented from clogging in a short period of time, and the muffler can be used continuously for a long period of time. be.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

As shown in Fig. 1, a connection port 2 of a supply pipe 1 for untreated gas containing moisture and an outlet 3 for dehumidified gas.
A dehumidifying tower 5 filled with an adsorbent such as silica gel is interposed between two processing pipes 6, 6, and a connecting port 4 of the
are connected in parallel, and the upstream sides of each dehumidifying tower 5 of each processing pipe 6 are connected to each other by a connecting pipe 8,
An on-off valve 10 is interposed near the connecting portion of the connecting pipe 8 with both processing pipes 6 , 6 , and an on-off valve 1 is provided on the upstream side of the connecting portion of each processing pipe 6 with the connecting pipe 8 .
A discharge pipe 7 is connected to the middle part of the connecting pipe 8, and a silencer 13 is connected to the discharge pipe 7 via a drain separator 9, which will be described later. The downstream sides of each of the dehumidifying towers 5 of 6 are connected to each other by a connecting pipe 14 in which check valves 12, 12 are interposed near both ends in opposite directions, and are connected to the connecting pipe 14 of each processing pipe 6. Check valves 15, 15 are provided on the downstream side of the section, respectively, facing oppositely to each other, and a throttle valve 16 is provided between the intermediate section of the connecting pipe 14 and the connecting section between the two processing pipes 6, 6. They are connected by a bypass pipe 17, and by the action of check valves 12 and 15, the flow direction in the bypass pipe 17 is always in the direction of the arrow in the figure. Open the on-off valve 11 on the right side of the connecting pipe 8 and close the on-off valve 11 on the right side.
When opened, pressurized untreated gas supplied from the connection port 2 of the supply pipe 1 flows through the dehumidification tower 5 on the left side to be dehumidified, flows into the take-out pipe 3 via the check valve 15, and A part of the dehumidified gas flows into the bypass pipe 17 and passes through the throttle valve 16 to expand and further reduce the humidity, and then flows through the right dehumidification tower 5 through the check valve 12. , flows out into the discharge pipe 7 through the on-off valve 10 of the connecting pipe 8, and by switching each on-off valve 10, 11 in the opposite direction to the above, the untreated gas is now transferred to the right dehumidification tower 5.
The dehumidified gas flows into the take-out pipe 3, and a part of the dehumidified gas also flows into the bypass pipe 17, and as before, the humidity is further reduced and the dehumidification tower on the left side is dehumidified. 5 and flows out through the connecting pipe 8 to the discharge pipe 7. By switching the on-off valves 10 and 11 at regular intervals, untreated gas is removed in one dehumidifying tower 5. While dehumidification is being performed, the dehumidified gas dehumidified by the dehumidifying tower 5 flows through the other dehumidifying tower 5, and the adsorbent therein is dehydrated and regenerated. As a result, dehumidification of untreated gas is carried out continuously.

In the drain separator 9 described above, a deflector 21 is interposed between the inlet 18 and the outlet 20, and the inflow gas from the inlet 18 swirls around the deflector 21, thereby removing water and moisture in the gas. The dust is pushed to the inner wall of the container by centrifugal force, and only the removed gas passes through the filter element 19 and flows out from the outlet 2, and a valve port 22 is formed at the bottom of the container. It is something that has been done,
A cylinder 23 is attached to the lower surface of the drain separator 9 by a mounting member 25 having a through hole 24, and a piston rod 26 is connected to a piston 29 fitted in the cylinder 23 and passes through the valve port 22. Valve body 27 that opens and closes the valve port 22 at the tip
is fixed, and this valve body 27 is biased in the direction of opening the valve port 22 by the elasticity of a spring 28 attached to the lower surface of the piston 29, and a port 30 formed in the cylinder 23 on the upper surface side of the piston 29.
is connected to the downstream side of the throttle valve 16 of the bypass pipe 17 by the communication pipe 31, and since the pressure on the downstream side of the throttle valve 16 is normally approximately equal to atmospheric pressure, the valve body 27 is moved by the elasticity of the spring 28. The valve opening 22 is held in an open state by being spaced apart above the valve opening 22.

To switch from the state in which dehumidification is performed in the processing pipe 6 on the left side of the figure and regeneration in the processing pipe 6 on the right side to the opposite state, the on-off valve 1 of the processing pipe 6 on the left side must be
1 from open to closed, the on-off valve 11 of the right processing pipe 6 from closed to open, the on-off valve 10 on the left side of the connecting pipe 8 from closed to open, and the on-off valve 10 on the right side from open to closed. However, in order to prevent the pressure on the extraction pipe 3 side from temporarily decreasing during this switching, first, the on-off valves 1 of the left and right processing pipes 6 are turned off.
1 and 11 and close the on-off valve 10 on the right side of the connecting pipe 8, then switch on the on-off valve 10 on the left side.
is kept closed for a while, and when the pressure in the right pipe, which is the dehumidifying side, has risen sufficiently, the on-off valve 10 on the left side of the connecting pipe 8 is opened. By doing so, the pressure in the extraction pipe 3 is maintained at a high pressure due to the residual pressure in the left pipe until the pressure in the right pipe increases sufficiently, and then the pressure in the connecting pipe 8 is When the left on-off valve 10 is opened, the high pressure gas in the left pipe is discharged to the exhaust pipe 7.
Until the opening/closing valve 10 on the left side of the connecting pipe 8 is opened, both opening/closing valves 10 and 11 on the left side of the dehumidifying tower 5, which was the dehumidifying side, are closed. As the untreated gas is supplied to the dehumidification tower 5, the throttle valve 1 of the bypass pipe 17
6, and when the pressure exceeds a predetermined value, the piston 29 is pushed down against the elasticity of the spring 28 of the cylinder 23, and the valve port 22 of the drain separator 9 is connected by the valve body 27. The on-off valve 10 on the left side of the pipe 8 is closed before being opened, and
As a result, when the on-off valve 10 on the left side of the connecting pipe 8 is opened, the high pressure gas in the dehumidifying tower 5, which was on the dehumidifying side, flows from the outlet 20 of the drain separator 9 to the muffler 13.
On the other hand, the dehumidifying tower 5 which was on the dehumidifying side
When the residual pressure inside the bypass pipe 17 is removed, the pressure on the downstream side of the throttle valve 16 of the bypass pipe 17 decreases and becomes approximately equal to atmospheric pressure, so the piston 29 moves upward due to the elasticity of the spring 28 and closes the valve port 22. As a result, in a steady state, the exhaust gas that flows through the dehumidifying tower 5 on the regeneration side to remove moisture from the adsorbent therein and flows into the drain separator 9 through the exhaust pipe 7 teeth,
Most of the exhaust gas is discharged from the through hole 24 of the mounting member 25 through the valve port 22, and even if the muffler 13 becomes clogged, the discharge resistance of the exhaust gas hardly increases. Back pressure is applied to the pipe line on the regeneration side, which prevents the pressure of the regeneration gas from increasing and reducing the regeneration efficiency. Further, since exhaust gas flows through the muffler 13 only temporarily when switching between dehumidification and regeneration, clogging is less likely to occur, and the muffler 13 can be used continuously for a long period of time.

In this embodiment, the exhaust gas passing through the muffler 13 is removed by the drain separator 9 to remove water and adsorbent particles contained in the gas. This has the advantage of preventing clogging and allowing continued use over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention. 1... Supply pipe, 3... Output pipe, 5... Dehumidification tower,
6... Processing pipe, 7... Discharge pipe, 10, 11... On-off valve, 13... Silencer, 16... Throttle valve, 17...
...Bypass pipe, 22...Valve port (relief valve), 27
...Valve body (of the relief valve).

Claims (1)

[Scope of utility model registration request] Two processing pipes, each with a dehumidifying tower filled with an adsorbent, are connected in parallel between a supply pipe that supplies untreated gas containing moisture and an extraction pipe that takes out dehumidified gas. Both processing pipes are connected on the take-out pipe side of each dehumidification tower by a bypass pipe equipped with a flow rate regulator such as a throttle valve or orifice, and the pressurized untreated gas is transferred to each dehumidification pipe of each processing pipe. By switching the switching valve installed on the upstream side of the tower, the untreated gas is alternately supplied to each of the processing pipes for a certain period of time, and the untreated gas is passed through one of the dehumidification towers and flows out to the take-out pipe. A dehumidification device in which a part of the dehumidified gas flowing out into the take-out pipe is depressurized through the bypass pipe and supplied to the other dehumidification tower, and the adsorbent in the dehumidification tower is dehydrated and regenerated, The exhaust pipe that leads the exhaust gas used for regeneration to the muffler is equipped with a normally open type valve that normally releases the exhaust gas into the atmosphere and closes when the pressure of the exhaust gas increases when the switching valve is switched. A dehumidifier characterized by having a relief valve installed.