JPH0549808A - Deaerator with backwash function - Google Patents

Abstract

PURPOSE:To perform backwash without stopping a deaerator and to remove dust sticking to the inside of a deaerating module. CONSTITUTION:A membrane type deaerating module 6 is connected with forward passages 9a, 9b and backward passages 10a, 10b at both the ends facing oppositely. The forward passage 9a connected with one end side of the membrane type deaerating module 6 and the backward passage 10a connected with the other end side of the membrane type deaerating module 6 are connected with a water supply line 3 on the raw water supply part 1 side interchangeably with each other, and the backward passage 10b connected with one end side of the membrane type deaerating module 6 and the forward passage 9b connected with the other end side of the membrane type deaerating module 6 are connected with a water supply line 3 on the treated water supply part 2 side interchangeably with each other.

Description

Detailed Description of the Invention

[0001]

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

[0002]

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

As the degassing device, a device using a gas separation membrane is widely used because of its compactness and easy 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 used, and raw water (tap water is supplied into the membrane deaeration module). Water, well water, other industrial water),
In this water passing process, the inside of the degassing module is evacuated to remove the dissolved gas in the raw water by degassing.

However, the above deaerator has the following problems. That is, since the raw water is supplied to the membrane type degassing module from one direction, dust (impurities) are likely to be attached to the inlet of the hollow fiber membrane in the degassing module to cause clogging. Therefore, it is necessary to stop the apparatus regularly (1 to 4 months) to allow the raw water to flow in from the opposite side of the degassing module for backwashing, or to wash it with a chemical or the like when it is extremely dirty.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is capable of exhibiting a backwashing function by switching the feed direction of raw water to both forward and reverse directions with respect to the membrane degassing module. The present invention is to provide an electric device.

[0006]

In order to solve the above-mentioned problems, the present invention comprises a membrane degassing module connected in a water supply line between a raw water supply section and a treated water distribution section. In the deaerator, a forward flow passage and a reverse flow passage are connected to both ends of the membrane degassing module in a facing manner, and a forward flow passage connected to one end side of the membrane degassing module, and the membrane type The reverse flow passage connected to the other end side of the degassing module to the water supply line on the raw water supply side, and the reverse flow passage connected to the one end side of the membrane degassing module and the membrane degassing The normal flow path connected to the other end side of the module is switchably connected to the water supply line on the treated water supply and distribution unit side, and further, the treated water supply and distribution unit and the membrane degassing module A drain line for draining sewage was installed in the water supply line between It is characterized.

[0007]

According to the present invention, it is possible to carry out periodic backwashing by selectively switching the supply direction of the raw water into the membrane type degassing module between the normal flow path and the reverse flow path.
Then, the treated water (dirty water) containing dust is discharged from the drain line for a predetermined time by backwashing, and then clean degassed treated water is supplied to the treated water supply unit.

[0008]

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

The pressure reducing valve (4) prevents the supply of water pressure above a certain level to the membrane degassing module (6), and is intended to prevent damage to the membrane degassing module (6). ..

Forward flow channels (9a) (9b) and reverse flow channels (10a) (10b)
Are connected to both ends of the membrane type degassing module (6) so as to face each other, as shown in FIG. In addition, the above-mentioned membrane type degassing module
The forward flow passage (9a) connected to one end of (6) and the reverse flow passage (10a) connected to the other end of the membrane degassing module (6)
Raw water supply section (1) of the water supply line (3) via the three-way valve (5)
Side switchable connection, membrane type degassing module
The reverse flow passage (10b) connected to one end of (6) and the normal flow passage (9b) connected to the other end of the membrane degassing module (6)
Treated water distribution unit of water supply line (3) via three-way valve (7)
It is connected to the (2) side.

The first and second three-way valves (5) and (7) are valves for switching the feed direction of the raw water to the membrane degassing module (6), and specifically, the first With the three-way valve (1) A and B valves open, the C valve closed, and the second three-way valve (7) A and B valves open and the C valve closed, the normal flow passage (9a) (9b) communicates with each other through the membrane degassing module (6), the B and C valves of the first three-way valve (5) are open, the A valve is closed, and the B of the second three-way valve (7) is B, When the C valve is open and the A valve is closed, the reverse flow paths (10a) (10b) operate as if they communicate with each other through the membrane degassing 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), the raw water is passed through the inside of these hollow fiber membranes, and the outside thereof is vacuumed. The dissolved oxygen in the raw water is removed in the course of water passing through the hollow fiber membrane.

In the present invention, the membrane type degassing module
(6) Water-sealed vacuum pump as a means for vacuuming the inside (11)
This water-sealed vacuum pump (11) is connected via a water supply line (12) branched from the water supply line (3) to the membrane degassing module (6). Are connected via the 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 the vacuum deaeration line (13) is provided with a second solenoid valve (16), and together with the first solenoid valve (15), a signal from a controller (not shown) is provided. To respond to. In the figure, (17) is an exhaust / drain line of the water-sealed 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 unit (2) and the membrane degassing module (6). It is provided and a valve (19) is inserted in the middle. This drain line (19)
Due to the clogging of the membrane type degassing module (6), the normal flow path (9
When switching from (a) (9b) to the reverse flow channels (10a) (10b), dust adhering to the hollow fiber membrane inlet in the membrane degassing module (6) is backwashed and flows out together with the treated water. This is for closing the outlet valve (8) for a short time so that the drainage line (18) is not drained.

In the deaerator having the above structure, raw water is supplied from the raw water supply section (1) to the water supply line (3), the pressure reducing valve (4) and the membrane type deaerating module by a signal from a controller (not shown).
The first to second solenoid valves (15) and (16) are opened and the water-sealed vacuum pump (11) is opened in accordance with the passage of the normal flow passages (9a) and (9b) across the (6). Is activated to vacuum degas the dissolved gas in the raw water. When the water supply stops, a water-sealed vacuum pump (1
1) is stopped and the solenoid valves (15) (16) are closed.

When such a deaerator is operated for a long time (several months), dust (impurities) mixed in the raw water adheres to the gas separation membrane in the membrane deaerator module (6) to cause clogging. Cause the performance of the deaerator to deteriorate. Therefore, a predetermined period is determined and the first to second three-way valves (5) and (7) are operated from the normal flow passages (9a) and (9b) to switch to the reverse flow passages (10a) and (10b). Thus, the dust attached to the gas separation membrane in the membrane degassing module (6) is backwashed and flows out. Since it is a problem that dust also flows out to the treated water supply / distributor (2) as treated water at the same time, at the same time as switching the three-way valves (5) and (7), a signal from the controller causes the outlet valve ( 8) is closed and the valve (19) of the drain line (18) is opened for about 3 minutes. When the wastewater treatment by switching the three-way valve is completed in this manner, the outlet valve (8) is opened by the signal near the controller and the valve (19) of the drain line (18) is closed to perform normal operation.

A second embodiment which replaces the above embodiment is shown in FIG. In the embodiment shown in FIG. 2, two membrane degassing modules (6) are provided in parallel in two columns, which is designed to increase the amount of treated water and also serves as a space saving installation space.

In the membrane degassing module (6) provided in parallel in the two vertical stages, the raw water inlets of the normal flow passages (9a) and (9b) are connected to the upper part (A) of the membrane degassing module (6). It is provided at the central connection between the lower part (B) and the lower part (B).
Are provided at the end of each. Also, the reverse flow path (10a) (10b)
In the raw water inlet, the raw water outlets of the normal flow passages (9a) and (9b) are raw water inlets, and in the raw water outlet, the raw water inlets of the normal flow passages (9a) and (9b) are raw water outlets.

The flow passages of the normal flow passages (9a) and (9b) will be explained. As shown in FIG. 2, the normal flow passage valve (20) inserted in the water supply line (3) is opened to feed the raw water into a membrane type. It flows in from the raw water inlet of the degassing module (6). The raw water that has flowed in is split and vacuum degassed toward the ends of the upper part (A) and the lower part (B) of the membrane degassing module (6). The raw water that has been degassed in vacuum merges from the raw water outlet via the normal flow passages (9a) and (9b), passes through the normal flow passage valve (21), and flows out to the treated water supply unit (2). When the raw water is flowing through the normal passages (9a) (9b), the reverse passage valves (22) (23) are closed.

Next, the flow passages of the reverse flow passages (10a) (10b) will be explained. As shown in FIG. 2, the reverse flow passages (10a) (10b) branched from the middle of the water supply line (3) will be described. The inserted reverse flow path valve (22) is opened, and raw water is introduced from the raw water inlet provided in the membrane degassing module (6). The raw water that has flowed in is vacuum degassed from the upper end (A) and the lower end (B) of the membrane degassing module (6) into the central part. The raw water that has been degassed in vacuum passes through the reverse flow passage valve (23) inserted into the reverse flow passages (10a) and (10b) branched from the middle of the normal flow passages (9a) and (9b) from the raw water outlet. Effluent to the treated water distribution unit (2). When the raw water is flowing through the reverse passages (10a) (10b), the normal passage valves (20) (21) are closed. When switching from the normal flow path to the reverse flow path (the same applies in the opposite case), the waste water treatment is performed via the drain line as in the first embodiment.

In the above description, a hollow fiber membrane is used as the gas separation membrane which constitutes the membrane type degassing module, but other types, for example, a flat membrane formed into a laver roll, etc. Although a water-sealed vacuum pump is used as the vacuum suction means of the membrane degassing module, other vacuum suction means such as an ejector may be used.

[0022]

According to the present invention, since the inflow passage for supplying raw water to the membrane type degassing module is provided with two passages, a normal passage and a reverse passage, the apparatus is regularly stopped as in the conventional case. The gas separation membrane in the membrane-type degassing module was backwashed or washed, but the gas separation membrane can be switched from the normal flow passage to the reverse flow passage (or vice versa) without stopping the device. Can be backwashed. Also, the sewage generated when switching is
It is sanitary because it drains through the drain line for a predetermined time. As described above, since the dust adhering to the gas separation membrane of the membrane degassing module is backwashed without stopping the operation of the degassing apparatus, the operating rate of the degassing apparatus can be improved.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a configuration of a degassing device showing a second embodiment replacing the embodiment of FIG.

[Explanation of symbols]

 (1) Raw water supply section (2) Treated water distribution section (3) Water supply line (6) Membrane degassing module (9a) Direct flow path (9b) Direct flow path (10a) Reverse flow path (10a) Reverse Flow path (11) Water-sealed vacuum pump (18) Drain line

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eizo Takahashi 7 Horie-cho, Matsuyama-shi, Ehime Prefecture Miura Industry Co., Ltd.

Claims (2)

[Claims] 1. A deaerator comprising a membrane deaerator module (6) connected in a water supply line (3) between a raw water supply section (1) and a treated water distribution section (2), Membrane type degassing module
A normal flow path (9a) (9b) and a reverse flow path (10a) (10b) are connected to both ends of (6) so as to face each other, and a normal flow path connected to one end side of the membrane degassing module (6) is connected. The flow path (9a) and the reverse flow path (10a) connected to the other end of the membrane degassing module (6) are connected to the water supply line (3) on the raw water supply section (1) side, and The reverse flow channel (10b) connected to one end of the membrane degassing module (6) and the normal flow channel (9b) connected to the other end of the membrane degassing module (6) are treated water feeds. A deaerator equipped with a backwash function, which is switchably connected to the water supply line (3) on the section (2) side. 2. A drain line (18) for draining sewage is provided in a water supply line (3) between the treated water distributor (2) and the membrane degassing module (6). Claim 1 characterized by
A deaerator having the backwash function described in 1.