JP2737468B2 - Degassing device with backwash function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a degassing apparatus applied to a water supply line for refrigeration equipment, and more particularly to an improvement in a backwash function of a membrane type degassing module. is there.

[0002]

2. Description of the Related Art As is well known, a deaerator is incorporated in a water supply line to cooling and heating equipment such as a boiler, a water heater or a cooler for the purpose of preventing internal corrosion of these equipment. In recent years, a deaerator has been used as a measure for preventing red water in buildings such as buildings and condominiums.

[0003] As the deaerator, those using a gas separation membrane are frequently used because of the compactness of the device and the simplicity of handling. In this type of deaerator, a deaeration module containing a gas separation membrane such as a hollow fiber membrane is connected in a water supply line to equipment to be used, and raw water (water supply) is stored in the membrane deaeration module. Water, well water, and other industrial water)
In this water passing process, the inside of the degassing module is evacuated to degas and remove dissolved gases in the raw water.

[0004] However, the above-mentioned deaerator has the following problems. That is, since the supply of the raw water into the membrane type degassing module is performed in one direction, dust (impurities) adheres to the entrance of the hollow fiber membrane in the degassing module, so that clogging is likely to occur. For this reason, the apparatus must be stopped periodically (1 to 4 months) and the raw water must flow in from the opposite side of the degassing module to perform backwashing.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention switches a supply direction of raw water in both forward and reverse directions with respect to a membrane type deaeration module, thereby enabling a backwash function to be exhibited. It provides a pneumatic device.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a membrane type deaeration module is connected to a water supply line between a raw water supply section and a treated water supply / distribution section. In the deaerator, a normal flow path and a reverse flow path are connected to both ends of the membrane type deaeration module in opposition, and a normal flow path connected to one end side of the membrane type deaeration module, and the membrane type deaeration module. A reverse flow path connected to the other end of the deaeration module is connected to the water supply line on the raw water supply unit side, and a reverse flow path connected to one end of the membrane deaeration module and the membrane deaeration The normal flow path connected to the other end of the module is connected to a water supply line on the treated water supply / distribution unit side so as to be switchable, and further, the treated water supply / discharge unit and the membrane deaeration module A drain line for wastewater drainage in the water supply line between It is characterized.

[0007]

According to the present invention, the backwater can be periodically washed by selectively switching the supply direction of the raw water into the membrane type deaeration module between the normal flow path and the reverse flow path.
Then, after processing water (dirty water) containing garbage is discharged from the drain line for a predetermined time by back washing, clean deaerated processing water is supplied to the processing water supply / distribution section.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing the arrangement of each device of the deaerator of the present invention. In the deaerator of the present invention, a pressure reducing valve (4) and a first three-way valve (5) are provided in a water supply line (3) between a raw water supply section (1) and a treated water supply and distribution section (2). ,
The membrane type deaeration module (6), the second three-way 1 (7) and the outlet valve (8) are connected.

The pressure reducing valve (4) prevents the supply pressure of the supply water to the membrane-type degassing module (6) from exceeding a certain level, and prevents the membrane-type degassing module (6) from being damaged. .

[0010] Forward passages (9a) (9b) and reverse passages (10a) (10b)
Are connected to both ends of the membrane type deaeration module (6) in opposition, as shown in FIG. Also, the above membrane type degassing module
The first passage (9a) connected to one end of (6) and the reverse passage (10a) connected to the other end of the membrane deaeration module (6) are connected to the first passage.
Raw water supply section (1) of water supply line (3) via three-way valve (5)
Switchable connection on the side, membrane degassing module
The reverse flow path (10b) connected to one end of (6) and the normal flow path (9b) connected to the other end of the membrane deaeration module (6)
Through the three-way valve (7) of the water supply line (3)
(2) It is connected to the side.

The first and second three-way valves (5) and (7) are valves for switching the supply direction of raw water to the membrane type deaeration module (6). When the A and B valves of the first three-way valve (5) are open and the C valve is closed, the A and B valves of the second three-way valve (7) are open and the C valve is closed, (9b) communicates via the membrane deaeration module (6), the first three-way valve (5) B and C valves are open, the A valve is closed, and the second three-way valve (7) B and When the valve C is open and the valve A is closed, the operation is performed as if the reverse communication passages (10a) and (10b) are connected through the membrane type deaeration module (6).

The membrane type degassing module (6) can be composed of, for example, a large number of hollow fiber membranes (inner diameter of about 200 μm). Raw water is passed through the inside of these hollow fiber membranes, and the outside is evacuated. In this process, dissolved oxygen in raw water is removed during the passage of water through the hollow fiber membrane.

According to the present invention, the membrane type degassing module is provided.
(6) Water ring vacuum pump (11) as a means for vacuum suction inside
This water-sealed vacuum pump (11) is connected via a water-sealing supply line (12) branched from the water supply line (3), and is connected to the membrane-type deaeration module (6). In other words, they are connected via a vacuum degassing line (13). The sealed water supply line (12) has a constant flow valve (14) and a first solenoid valve (1).
5) is provided, and a second solenoid valve (16) is provided in the vacuum degassing line (13), and together with the first solenoid valve (15), a signal from a controller (not shown) is provided. It works in response to (17) in the figure is an exhaust / drain line of the water ring vacuum pump (11).

A drain line (18) branched from the water supply line (3) is provided at a predetermined position of the water supply line (3) between the treated water supply / distribution section (2) and the membrane deaeration module (6). The valve (19) is inserted on the way. This drain line (19)
Due to the clogging of the membrane deaeration module (6), the normal flow path (9
a) When switching from (9b) to the reverse flow path (10a) (10b), dust adhering to the hollow fiber membrane inlet in the membrane deaeration module (6) is backwashed and flows out together with the treated water This is for closing the outlet valve (8) for a short time to drain the water from the drain line (18) so as to prevent the drainage.

In the deaerator having the above structure, raw water is supplied from a raw water supply unit (1) to a water supply line (3), a pressure reducing valve (4), and a membrane type deaeration module according to a signal from a controller (not shown).
(6) Open the first and second solenoid valves (15) and (16) in accordance with passing through the normal flow passages (9a) and (9b) with the water ring vacuum pump (11) Operates to vacuum degas dissolved gases in the raw water. When the water supply stops, the water ring vacuum pump (1
1) is stopped and the solenoid valves (15) and (16) are closed.

When such a deaerator is operated for a long time (several months), dust (impurities) mixed with raw water adheres to the gas separation membrane in the membrane deaeration module (6) and clogs. And the performance of the deaerator decreases. Therefore, a predetermined period is determined, and the first and second three-way valves (5) and (7) are operated from the normal flow paths (9a) and (9b) to switch to the reverse flow paths (10a) and (10b). As a result, dust adhering to the gas separation membrane in the membrane type degassing module (6) is backwashed and flows out. It is a problem that garbage simultaneously flows out to the treated water supply / distribution section (2) as treated water.Therefore, at the same time as the switching of the three-way valves (5) and (7), the outlet valve ( 8) is closed and the valve (19) of the drain line (18) is opened for about 3 minutes. When the sewage treatment by switching the three-way valve is completed in this way, the outlet valve (8) is opened by the signal near the controller, the valve (19) of the drain line (18) is closed, and normal operation is performed.

FIG. 2 shows a second embodiment in place of the above embodiment. In the embodiment shown in FIG. 2, a membrane type degassing module (6) is provided in two vertical stages in parallel, which is used to increase the amount of treated water and also serves as a space saving installation space.

In the membrane type deaeration module (6) provided in two vertical stages in parallel, the raw water inlet of the normal communication flow path (9a) (9b) is connected to the upper part (A) of the membrane type deaeration module (6). And the lower section (B), and the raw water outlet is provided at the upper section (A) and the lower section (B).
Is provided at each end. Also, the reverse flow path (10a) (10b)
In the raw water inlet, the raw water outlet of the main flow path (9a) (9b) is a raw water inlet, and the raw water outlet is the raw water inlet of the main flow path (9a) (9b).

Referring to the flow passages of the flow passages (9a) and (9b), as shown in FIG. 2, the flow passage valve (20) inserted into the water supply line (3) is opened, and the raw water is supplied to a membrane type. It flows in from the raw water inlet of the deaeration module (6). The inflowing raw water is diverted toward the ends of the upper section (A) and the lower section (B) of the membrane deaeration module (6), respectively, and is vacuum deaerated. The vacuum degassed raw water merges from the raw water outlet via the normal flow channels (9a) and (9b), passes through the normal flow channel valve (21), and flows out to the treated water supply / distribution unit (2). When the raw water is flowing through the main flow passages (9a) and (9b), the reverse flow valves (22) and (23) are closed.

Next, the flow paths of the reverse flow paths (10a) and (10b) will be described. As shown in FIG. 2, the reverse flow paths (10a) and (10b) branch from the middle of the water supply line (3). The inserted reverse flow passage valve (22) is opened, and raw water flows in from a raw water inlet provided in the membrane type deaeration module (6). The inflowing raw water flows into the center from the upper end (A) and the lower end (B) of the membrane type deaeration module (6), and is vacuum deaerated. The vacuum degassed raw water passes through the reverse flow path valve (23) inserted into the reverse flow paths (10a) (10b) branched from the middle of the normal flow paths (9a) (9b) from the raw water outlet. To the treated water distribution section (2). When the raw water is flowing through the reverse communication flow paths (10a) (10b), the normal communication valves (20) and (21) are closed. At the time of switching from the normal flow channel to the reverse flow channel (the same applies to the opposite case), sewage treatment is performed via a drain line as in the first embodiment.

In the above description, the hollow fiber membrane is used as the gas separation membrane constituting the membrane type degassing module. Other types, for example, a flat membrane formed in a laver winding shape, etc. Although a water-sealed vacuum pump is used as the vacuum suction means of the membrane type deaeration module, other vacuum suction means such as an ejector may be used.

[0022]

According to the present invention, since two inflow channels for supplying raw water to the membrane type deaeration module are provided: a normal channel and a reverse channel, the device is periodically stopped as in the prior art. The gas separation membrane in the membrane type degassing module is backwashed or washed, but the gas separation membrane is switched by switching from the normal flow path to the reverse flow path (or vice versa) without stopping the apparatus. Can be backwashed. Sewage generated at the time of switching is
It is sanitary because the water is drained through the drain line for a predetermined time. As described above, since the dust attached to the gas separation membrane of the membrane type degassing module is backwashed without stopping the operation of the degassing device, the operation rate of the degassing device can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a deaerator showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a deaerator according to a second embodiment, which replaces the embodiment of FIG.

[Explanation of symbols]

 (1) Raw water supply section (2) Treated water supply / distribution section (3) Water supply line (6) Membrane deaeration module (9a) Normal flow path (9b) Normal flow path (10a) Reverse flow path (10a) Reverse Flow channel (11) Water ring vacuum pump (18) Drain line

 ────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-3-32724 (JP, A)

Claims (2)

(57) [Claims] A deaeration device comprising a membrane deaeration module (6) connected to a water supply line (3) between a raw water supply part (1) and a treated water supply and distribution part (2), The membrane deaeration module
The flow passages (9a) (9b) and the reverse flow passages (10a) (10b) are connected to both ends of (6) in opposition, and the flow passage connected to one end of the membrane type deaeration module (6) is connected. The flow path (9a) and the reverse flow path (10a) connected to the other end of the membrane type deaeration module (6) are connected to the water supply line (3) on the raw water supply section (1) side. A reverse flow path (10b) connected to one end of the membrane deaeration module (6) and a normal flow path (9b) connected to the other end of the membrane deaeration module (6) are supplied with treated water. A degassing device having a backwash function, characterized in that the dewatering device is switchably connected to the water supply line (3) on the part (2) side. 2. A drain line (18) for draining sewage is provided in a water supply line (3) between the treated water supply / distribution section (2) and the membrane deaeration module (6). Claim 1.
A degassing device provided with a backwashing function according to item 1.