JPS60175520A - Dehumidification apparatus of compressed air system - Google Patents

Abstract

PURPOSE:To reduce installation cost by attaining the simplification of constitution and the reduction of an installation space without losing preparatory function, by providing three dehumidification towers, and first and second change- over values for changing over flowlines of compressed air and heated air used in regeneration to three dehumidification towers. CONSTITUTION:When a dehumidification tower 106A is in a dehumidification process, a dehumidification tower 106B in a regeneration process and a dehumidification tower 106C in a stand-by state, compressed air is dehumidified in the dehumidification tower 106A through a prefilter 103A and supplied to various measuring machineries through an after-filter 107. On the other hand, heated air is sent to the dehumidification tower 106B from a flower 120A and a heater 119A to regenerate an absorbing material under heated. For example, when the dehumidification tower 106A has gone wrong, dehumidification is performed in the dehumidification tower 106C and regeneration is performed in the dehumidification tower 106B. On the other hand, valves 105A, 107A-110A are closed to perform the inspection and repairing of the dehumidification tower 106A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a compressed air dehumidifier that removes moisture, foreign matter, etc. from compressed air supplied to B1 equipment in, for example, a nuclear power plant.

[Technical background of the invention]

For example, a nuclear power plant is provided with an instrumentation compressed air system that supplies instrumentation compressed air to various air-operated valves or flow rate controllers. However, if the compressed air for instrumentation contains moisture or foreign matter, it may cause malfunction or failure. Therefore, a dehumidifier is installed to lower the dew point of the compressed air so that it does not condense, and a filter is used to remove foreign substances.

Therefore, a conventional compressed air dehumidifier for instrumentation will be explained with reference to FIG. This instrumentation compressed air dehumidifier has two series, A series and B series.
Both series have the same structure. The A series will be explained below.

In other words, this row of people has one prefilter 2-A.

Two dehumidification towers 9, 10, two outer filters 1
31.14 is composed of one heater J7A and one blower 18A, etc., and one of the dehumidifying towers, for example, the dehumidifying tower 9A, dehumidifies the compressed air, and the other dehumidifying tower 10 dehumidifies the compressed air. The adsorbent containing moisture is regenerated (heating regeneration step) using the heated air supplied from the heater J7A and the heater J7A. In addition, two dehumidification towers 9 have one
0 has a configuration in which dehumidification and regeneration steps are alternately repeated at predetermined time intervals. For example, when dehumidifying in the dehumidifying tower 9A, compressed air introduced through the pipe 1 is guided into the dehumidifying tower 9A via the brefill 22 and valve 3A, and is dehumidified by the adsorbent in the dehumidifying tower 9A. be done. The dehumidified compressed air is then transferred to the piping 20A1 after filter 13 and the piping 21
The signal is sent to each instrumentation device (not shown) via. On the other hand, a heating regeneration process is being performed in the dehumidification tower 10. In other words, the blower 18A, heater J7A and piping 22A
Heated air is supplied to the dehumidification tower 10k via the 1-valve 8A. This heated air is used to remove moisture from the adsorbent in the dehumidifying tower 10. The air containing the removed moisture is exhausted to the valve 6A1 piping 23 connected to the lower part of the adsorption tower 10 and through the valve 16k. At this time, valves 4A, 5A, and 7A are closed. After the heating regeneration process is completed, 1. A cooling regeneration step in which the temperature of the adsorbent is lowered and a pressure increasing regeneration step in which the pressure inside the dehumidifying tower 10 is increased to approximately the same pressure as the compressed air are entered. In other words, in the cooling regeneration process, the blower 18'! :T> Stops the supply of heated air, closes valve 8A, and closes valve J5A.
Open the door. Compressed air is then supplied into the dehumidification tower 10A via the pipe Z4A and the valve 15A to cool the adsorbent within the dehumidification tower 10A. Its removal valve 6A.

It is exhausted to the piping 23 and via the valve 16k.

Next, the pressure regeneration process begins. That is, in the above state, valve 1
6 is closed, and the pressure inside the dehumidifying tower 10A is increased to the same pressure as the compressed air. In this state, the dehumidification tower 9A that was in the dehumidification process and the dehumidification/regeneration process are switched. This dehumidification and regeneration process is switched by closing the open valves 3A and 6k and opening the closed valves 4A and 5A. By switching the dehumidifying and regenerating process, the dehumidifying tower 9A that was in the dehumidifying process repeats the regenerating process. Note that IA and 17A in the figure.

12 shows a valve.

Although the A series has been described above, the B series also has a similar configuration and functions as a backup in case the h series fails. In the figure, each device of the B series is shown with the same number as the A series with the symbol (B) attached.

[Problems with background technology]

According to the above configuration, there are two dehumidifiers, A series and B series.
The structure is such that even if one of the series breaks down, the other series continues dehumidifying operation and repairs the failed series, but such a configuration requires less equipment cost and installation space. Therefore, there has been a demand for a compressed air dehumidifier that can simplify the configuration without losing its reserve functions, thereby reducing equipment costs and installation space.

[Purpose of the invention]

The present invention has been made based on the above points, and its purpose is to simplify the configuration without losing reserve functions, thereby reducing equipment costs and installation space. An object of the present invention is to provide a compressed air dehumidification device that is capable of

[Summary of the invention]

That is, the compressed air dehumidification device according to the present invention includes a pre-filter that removes foreign matter from the compressed air, three dehumidification towers that introduce and dehumidify the compressed air from which the foreign matter has been removed by the pre-filter, and the above-mentioned pre-filter. A first switching valve mechanism that switches the flow paths from the filter to the three dehumidifying towers, an after-filter that removes foreign matter from the compressed air dehumidified by the dehumidifying tower, and a dehumidifying device that dehumidifies for a predetermined period of time. a heated air supply mechanism that sends heated air into the tower to regenerate the adsorbent in the dehumidification tower; a second valve switching mechanism that switches the flow paths from this heated air supply mechanism to the three dehumidification towers; This structure includes a cooling and pressurizing horizontal groove that cools the regenerated adsorbent and increases the pressure inside the dehumidification tower.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5. FIG. 2 is a system diagram of the compressed air dehumidifier according to this embodiment. That is, two prefilters 1031
．． 103B, 3 dehumidification towers 106, 106B, 106
'C, 2 77 Tatara 1151.115B, 2 heaters 119, 119B and 2 blowers 12
61.120B etc. Conventionally, four dehumidification towers performed the backup function, but this can now be performed with three dehumidification towers, thereby reducing the amount of incidental equipment. It is the composition. That is, three dehumidification towers 106 A
, 106B.

One of the 106Cs is used in the dehumidification process, one is used in the regeneration process, and the remaining one is on standby as a backup.

For example, if a dehumidifying tower in a dehumidifying process fails, a dehumidifying tower on standby performs the dehumidifying process and repairs the failed dehumidifying tower. The details will be explained below.

Compressed air introduced via piping 101 is supplied to valve 10RAS.
76 refilter 103, piping 104 and valve 105A
The air is introduced into the dehumidifying tower 106A during the dehumidifying process and is dehumidified by the adsorbent in the dehumidifying tower 106A. At that time valve 10
5B and 105C are closed. The dehumidified compressed air is supplied to various instrumentation devices (not shown) via the valve 10flA, the piping 111, the valve 114A, and the afterfilter 115A. On the other hand, the dehumidification tower 106B in the regeneration process includes the ZOLON 120A and the heater 119A, as well as the shutoff valve 118.
A 1 Piping J/7A.

Heated air is supplied via piping 112 and valve 109B. By supplying this heated air, the adsorbent in the dehumidification tower 106B is heated and regenerated. The air is then exhausted via piping 121B and valve 110B. After the heating regeneration step is completed, compressed air is supplied into the dehumidification tower 106B through the pipe 122, valve 123, pipe 113, and valve 108B, and the heat-regenerated adsorbent is cooled and regenerated by the compressed air. The air is then exhausted via piping 121B and valve 110B. In this state, the valve 110B is closed to raise the pressure inside the dehumidification tower 106B to the same pressure as the compressed air. This completes the regeneration process in the dehumidification tower 106B. At this time, the dehumidification tower 106C is on standby in a dehumidifying state.

In addition, each dehumidification tower 106 has 106B.

The compressed air flow path to 106C is switched to each dehumidification tower 106.
1. 105 is inserted into the valve 105 inserted into the compressed air inlet side piping 104 and the outlet side piping 11 of 106B and 106C.
B, 105C, 1071° 101B, 107C). In addition, the flow path switching of heated air during heating regeneration is
109B, 109 are inserted into the valve 109 inserted into the pipe 112.
C, and further switching of the flow path of compressed air for cooling and external pressure regeneration is performed through valve 108 inserted in pipe JJJ.
8B and 108C. And each dehumidification tower 10
6k, J0(in), 106C, 121B, 121C are connected to the exhaust valve 110, pipe 121 with 110B, 110C inserted, respectively. In the figure, 102B*114B, 118, 1111B indicates a valve, respectively.

The operation will be explained based on the above configuration. As mentioned above, 3
Base dehumidification tower 1061.106B.

One of the 106C units is in the dehumidification process, one is in the adsorbent regeneration process, and the remaining 01 unit is on standby after completing the regeneration process. The dehumidifying tower in the dehumidifying step and the dehumidifying tower in the regenerating step perform dehumidification and regeneration alternately at predetermined time intervals, and the dehumidifying tower in a standby state is normally not used. When one of the two dehumidifying towers in use breaks down or is inspected, the other one and the one in standby are operated.

Therefore, a description will be given assuming that the dehumidification tower 106A is in a dehumidification process, the dehumidification tower 106B is in a regeneration process, and the dehumidification tower 106C is in a standby state. In this case, the operation is the same as described above, and regeneration such as dehumidification, heating, cooling, and pressurization is performed as indicated by the thick line in FIG.

Next, a case will be described in which one of the dehumidification towers 1061 and 106B, for example, the dehumidification tower 106k, fails. In this case, as shown in FIG. 3, the dehumidification tower 10 is in a standby state.
Dehumidification is performed at 6C and regeneration is performed at dehumidification tower 106B. That is, valves 105C and 107C are opened, and one-way valve 1051 is opened.
L.

1071. Close valves 1081, 1091 and ll0A to perform inspection and repair of dehumidification tower 106A, and compressed air is introduced into dehumidification tower 106C via pipe 1o4 and valve 105, and is absorbed by the adsorbent in dehumidification tower 106C. It is dehumidified.

The dehumidified compressed air is delivered to the valve 107C, piping 111, and valve 11.
4A and an aftercooler 115A to various instrumentation devices. Moreover, the regeneration in the dehumidification tower 106B is as described above. Thereafter, dehumidification is performed between the dehumidification towers 106B and 106F;C.

Playback is repeated alternately.

As described above, according to the compressed air dehumidification device according to the present embodiment, two lines each consisting of one pre-filter, two dehumidifying towers, two after-filters, one blower, and one heater are provided as in the conventional system, thereby dehumidifying the air. In contrast, the dehumidifier consists of one system consisting of one pre-filter, three dehumidifying towers, two after-filters, two blowers, and two heaters. At least one dehumidification tower and two after filters can be eliminated, and accordingly, the installation space and cost can be reduced. To explain this using the general installation example shown in Figures 4 and 5, in the conventional case, the road was 31.5 m2
7m) of space was required. On the other hand, in the case of this embodiment, the space required is about half, approximately 16.5 m2 (5.5 m x 3 m).

〔Effect of the invention〕

As detailed above, the compressed air dehumidifier according to the present invention includes a pre-filter that removes foreign matter from the compressed air, and three dehumidifiers that introduce and dehumidify the compressed air from which foreign matter has been removed by the pre-filter. a first switching valve mechanism that switches the flow path from the pre-filter to the three dehumidifying towers, an after-filter that removes foreign matter from the compressed air dehumidified by the dehumidifying tower, and a predetermined period of dehumidification. A heated air supply mechanism that sends heated air into the dehumidification tower to regenerate the adsorbent in the dehumidification tower, and a second valve switch that switches the flow path from this heated air supply mechanism to the three dehumidification towers. This structure includes a cooling mechanism and a cooling pressure increasing mechanism that cools the regenerated adsorbent and increases the pressure inside the dehumidification tower.

Therefore, the configuration can be simplified and the installation space can be reduced without losing reserve functions, and costs such as equipment costs can be reduced effectively.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a compressed air dehumidifier showing a conventional example, and FIGS. 2 to 5 are diagrams showing an embodiment of the present invention.
3 and 3 are system diagrams of a compressed air dehumidifying device showing an example of operation, and FIGS. 4 and 5 are layout diagrams of the device to explain the effects. 703A, 103B...Pre-filter, l 06
A rl 06B, J 06C...Dehumidification tower, 105
A, 105B. 105C, 107, 107B, 107C... valve (first switching valve mechanism), 115, 115B... after filter, 119, 119B... heater, 1
20, 120B... Zorua, 109A. J 09B, J 09C... Valve (second switching valve mechanism), 122... Piping, 1081.108B, 108
C. 123... Valve. Applicant's representative Patent attorney Takehiko Suzue Figure 4 Figure 5 5.5m

Claims (1)

[Claims] A pre-filter that removes foreign matter from compressed air, three dehumidification towers that introduce and dehumidify the compressed air from which foreign matter has been removed by the pre-filter, and flow paths from the pre-filter to the three dehumidification towers. an after-filter that removes foreign matter from the compressed air dehumidified by the dehumidification tower; and an after-filter that removes foreign substances from the compressed air dehumidified by the dehumidification tower, and an adsorption system that sends heated air into the dehumidification tower that has been dehumidified for a predetermined period of time. a heated air supply mechanism that regenerates the adsorbent; a second valve switching mechanism that switches the flow paths from the heated air supply mechanism to the three dehumidifying towers; and a second valve switching mechanism that cools the regenerated adsorbent and reduces the pressure inside the dehumidifying tower. A compressed air dehumidifier characterized by comprising a cooling pressure boosting mechanism that increases the temperature of the compressed air.