JPH08266807A - Counter flow washing mechanism for deaerator - Google Patents

Abstract

PURPOSE: To prevent the reduction of capacity of a deaerator without stopping the deaerator for the washing or the like of a membrane type deaeration module and to save resources (water). CONSTITUTION: In a deaerator, a membrane type deaeration module 3 is connected to a water supply line between a raw water feed part 1 and a treated water distribution part 2. The 1st flow passage switching means 6 for switching the flow direction of raw water into the membrane type deaeration module 3 and the 2nd flow passage switching means 11 for switching between a treated water feed line 19 and a sewage discharge line 20 are installed. A control means 15 for controlling the flow passage switching means 6, 11 is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a reverse water washing mechanism of a deaerator applied to building water supply pipes, cooling / heating equipment and the like.

[0002]

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

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 membrane degassing module containing a gas separation membrane such as a hollow fiber membrane is connected to the water supply line to the equipment used, and raw water is passed through the membrane degassing module. The inside of the membrane-type degassing module is evacuated during the passage of water, and the dissolved gas in the raw water is degassed and removed.

[0004]

In the above conventional structure, since the raw water is introduced into the deaerator from one direction,
Dust adheres to the raw water inflow port of the membrane type degassing module to cause clogging, which causes a decrease in capacity (flow rate and DO value). Therefore, it is necessary to periodically stop the deaerator and manually pass the raw water from the opposite side of the membrane deaerator to carry out backwashing, or to wash with chemicals or the like when it is extremely dirty.

Therefore, the present invention prevents the capacity of the deaerator from lowering, does not stop the deaerator for cleaning the membrane type deaerator, and saves resources (water). It is a problem to be solved.

[0006]

The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 provides a water supply line between a raw water supply section and a treated water distribution section. In the degassing device that connects the membrane degassing module,
Between the raw water supply unit and the membrane degassing module, a first flow path switching means for switching the flow direction of raw water into the membrane degassing module is provided, and the membrane degassing module and the treated water distribution A sewage discharge line from a treated water supply line between the two parts, and a second flow path switching means for switching the treated water supply line and the sewage discharge line at the branch point, and the first flow path switching means and The invention according to claim 2 is characterized in that detection means for controlling the second flow path switching means is provided, and the invention according to claim 2 is a membrane type dewatering system in a water supply line between the raw water supply section and the treated water distribution section. In a degassing apparatus having an air module connected, a first flow path switching means for switching a flow direction of raw water into the membrane degassing module is provided between the raw water supply unit and the membrane degassing module. , The membrane degassing module A sewage discharge line from a treated water supply line between the treated water supply unit and the treated water distribution unit, and a second flow path switching means for switching the treated water supply line and the sewage discharge line at the branch point, Providing a detection means for controlling the one flow path switching means and the second flow path switching means,
Further, the sewage discharge line is connected to the raw water supply part, and a filtration device is provided in the sewage discharge line.

[0007]

According to the present invention, before the dewatering device is reduced in performance, dust is attached to the inlet of the raw water into the membrane degassing module to cause clogging, and the membrane degassing device detects the degassing apparatus before the capacity is reduced. Detecting the clogging state of the inlet of the air module, automatically and selectively switching the water flow direction of the raw water into the membrane type degassing module at the appropriate time, and at the time of this switching, the treated water supply line and the waste water discharge line Switch. In addition, the sewage that has flowed into the sewage discharge line is filtered by the filtration device and is returned to the raw 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. First, referring to FIG. 1 showing a first embodiment of the present invention, the present invention is basically vacuum suctioned by a vacuum pump 22 into a water supply line between a raw water supply unit 1 and a treated water distribution unit 2. Membrane degassing module 3
It has been realized as a degassing device connected with. In FIG. 1, a raw water supply unit 1 is connected to a first port 7 of a first flow path switching means (hereinafter referred to as a four-way valve) 6 via a raw water supply line 16, and a membrane port is connected to a second port 8 of the four-way valve 6. One end 4 of the degassing module 3 is connected via a first pipe 17, and the other end 5 of the membrane degassing module 3 is connected to a third port 9 of the four-way valve 6 via a second pipe 18. Then, the treated water supply unit 2 is connected to the fourth port 10 of the four-way valve 6 via the treated water supply line 19, and the treated water supply line 19 is connected.
A sewage discharge line 20 is branched from this, and a second flow path switching means (hereinafter, referred to as a three-way valve) 11 for switching the treated water supply line 19 and the sewage discharge line 20 is provided at this branch point. That is, the first port 1 of the three-way valve 11
When the 2 and the second port 13 are communicated with each other, the treated water is supplied to the treated water distribution unit 2 and the first port 1 of the three-way valve 11 is connected.
When the 2 and the third port 14 are communicated with each other, the sewage is discharged from the sewage discharge line 20. Further, the treated water supply line 19 is provided with a detection means 15 for detecting the total amount of the treated water passing through the treated water supply line 19 at a position downstream of the point where the three-way valve 11 is provided.
Based on the detected value of 5, the four-way valve 6 and the three-way valve 1
It is configured to perform the control of 1.

In this embodiment, the detecting means 15
Is provided in the treated water supply line 19 at a position downstream of the three-way valve 11, but the present invention is not limited to this. For example, between the four-way valve 6 and the three-way valve 11 or The configuration provided in the raw water supply line 16 is also suitable depending on the implementation.

The detecting means 15 may be a timer, a flow meter, a pressure gauge, or the like. In some cases, an electric signal when operating a deaerator (not shown) is detected (electric signal ON- The operating time, the flow rate, etc. can be determined from OFF), and the detection means 15 for controlling the flow path switching means 6, 11 based on the electric signal can be provided.
It is suitable depending on the implementation.

Here, the flow direction of raw water in the membrane degassing module 3 is switched by the four-way valve 6, and the treated water supply line 19 and the waste water discharge line 2 are switched.
Switching to 0 is performed by the three-way valve 11. In FIG. 1, in the four-way valve 6, the first port 7 and the second port 8 are in communication, the third port 9 and the fourth port 10 are in communication, and the three-way valve 11 is
The first port 12 and the second port 13 are in communication with each other.

The initial operating condition of the above structure will be described with reference to FIG. Raw water supplied from the raw water supply unit 1 is passed through the four-way valve 6 into the membrane degassing module 3 with one end 4 of the membrane degassing module 3 as an inlet, and the water passing process Is degassed. The degassed treated water flows out from the other end 5 of the membrane type deaerating module 3, passes through the four-way valve 6 and the three-way valve 11, and through the treated water supply line 19 to the treated water distributor 2. Supplied.

When the deaerator (not shown) continues to operate in this state, dust or the like mixed in the raw water adheres to the end 4 which is the inlet of the membrane deaerator module 3. It causes clogging and reduces the performance of the deaerator. Therefore, in this embodiment, before the degassing device is reduced in performance by the detection means 15, dust or the like is attached to the raw water inflow port into the membrane type degassing module 3 to cause clogging, and the degassing device 15 is activated. The clogging state of the inlet of the membrane type degassing module 3 is detected, and based on the detection signal, the flow path switching means 6 and 11 are automatically controlled so that the inside of the membrane type degassing module 3 is controlled. By reversing the flow direction of the raw water to eliminate the clogging of the membrane degassing module 3, the waste water discharged at that time is discharged from the waste water discharge line 20, and after the discharge of the waste water is completed,
The treated water is supplied again as usual.

Specifically, a detection means 15 for determining the clogging state of the inlet of the membrane type degassing module 3 is provided in the treated water supply line 19, and a predetermined value is set in the detection means 15 in advance. When the value is equal to or more than that value, a signal is transmitted from the detection means 15 to each of the flow path switching means 6 and 11, and the four-way valve 6 and the three-way valve 11 are operated (the four-way valve 6 is connected to the first port 7). The third port 9 communicates with the second port 8 and the fourth port 10 communicates with each other, and the three-way valve 11 communicates with the first port 12 and the third port 14). Membrane type degassing module 3
The flow direction of the raw water to the inside is reversed from the initial state, and the inlet of the membrane degassing module 3 becomes the other end 5. By doing so, the clogging of the one end 4 of the membrane type degassing module 3 is eliminated, and the dust or the like that has caused the clogging is discharged from the sewage discharge line 20 as sewage. This is shown in FIG. 2, and this state is maintained for a certain period of time until dust or the like is removed (depending on the installation position and method of the detection means 15,
Judge that dust etc. is removed not by time but by flow rate value, pressure value, etc.). Then, after the elapse of this fixed time, the detection means 15 determines that dust or the like has been removed.

The detection means 1 detects that dust or the like has been removed.
When the determination is made by 5, the detection means 15 determines the three-way valve 11
Signal is transmitted to the first port 1 of the three-way valve 11.
2 and the second port 13 are communicated with each other. This is shown in FIG. 3, which is the inlet of the membrane degassing module 3 (in this case, the other end 5 of the membrane degassing module 3).
The treated water is supplied in this state until dust clogging occurs again.

After the deaeration device has been operated for a certain period of time, when the detection means 15 detects again the clogging of dust at the inlet of the membrane deaeration module 3, each flow path is switched based on the signal from the detection means 15. The means 6 and 11 are activated to switch the flow direction of the raw water into the membrane type degassing module 3 to clear the clogging of dust and to discharge the wastewater containing dust and the like from the wastewater discharge line 20. FIG. 4 shows this state. When the removal of dust and the like is completed, the first port 12 and the second port 13 of the three-way valve 11 are communicated with each other to supply the treated water. That is, it returns to the state of FIG.

As described above, in this embodiment, the detecting means 15 automatically controls the flow path switching means 6 and 11 to automatically perform the backwashing process of the membrane degassing module 3. Therefore, it is possible to prevent the performance of the degassing device from deteriorating, and to save the time and effort such as periodic back washing after stopping the degassing device. At the same time, the membrane type degassing module 3
The life (durability) of itself can be improved.

Next, FIG. 5 showing a second embodiment of the present invention.
Will be described. In this embodiment, the sewage discharge line 20 in the first embodiment is connected to the raw water supply unit 1, and the sewage discharge line 20 is provided with a filter device 21 composed of a filter or the like. Is. With this configuration, waste water is filtered by the filtering device 21 and reused, so that resources are saved.

In each of the embodiments described above, the four-way valve is used as the first flow path switching means 6 and the three-way valve is used as the second flow path switching means 11, but the present invention is not limited thereto. The present invention is not limited to the embodiment, and may have another configuration depending on the implementation. For example, as shown in FIG. 6 showing the third embodiment, the first passage switching means 6 is composed of two three-way valves 30 and 31, and as shown in FIG. 7 showing the fourth embodiment, the first passage The switching means 6 is composed of a first valve 40, a second valve 41, a third valve 42 and a fourth valve 43, and the second flow path switching means 11 is composed of a fifth valve 44 and a sixth valve 45. Are also suitable depending on the implementation.

Also in the second to fourth embodiments, the detecting means 15 is provided in the treated water supply line 19 as in the first embodiment, but the present invention is not limited to this. Instead, for example, a configuration provided between the first flow path switching means 6 and the second flow path switching means 11 or in the raw water supply line 16 is also suitable depending on the implementation.

Further, the detecting means 15 in the second to fourth embodiments may be a timer, a flow meter, a pressure gauge, etc., as in the first embodiment, and in some cases, the deaerator is operated. It is also suitable to detect the electric signal at that time and to provide the detecting means 15 for controlling each of the flow path switching means 6 and 11 based on the electric signal depending on the implementation.

[0022]

According to the present invention, the first flow path switching means for switching the flow direction of the raw water into the membrane type degassing module and the second flow for switching the treated water supply line and the waste water discharge line. By providing a path switching means and automatically controlling each of these flow path switching means based on the detection means, the flow direction of the raw water into the membrane degassing module is selectively switched at a suitable time. It is possible to prevent deterioration of the capacity of the degassing device due to clogging of the degassing module, and it is no longer necessary to perform the back-cleaning of the membrane degassing module after stopping the degassing device, which has been regularly performed in the past. In addition, the provision of a sewage discharge line branched from the treated water supply line made it possible to reliably prevent sewage from entering the treated water distribution unit. Furthermore, a filter is installed in the sewage discharge line, and after filtering the sewage through this filter, it is returned to the raw water supply section, which saves resources and simplifies the sewage treatment facility. Can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a water flow (supply of treated water) according to a first embodiment of the present invention.

FIG. 2 is a schematic explanatory view showing a reverse water flow (discharging waste water) state of the first embodiment of the present invention.

FIG. 3 Reverse water flow (supply of treated water) of the first embodiment of the present invention
It is a schematic explanatory drawing which shows a state.

FIG. 4 is a schematic explanatory view showing a water flow (discharging wastewater) state of the first embodiment of the present invention.

FIG. 5 is a schematic explanatory view showing a second embodiment of the present invention.

FIG. 6 is a schematic explanatory view showing a third embodiment of the present invention.

FIG. 7 is a schematic explanatory view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Raw Water Supply Part 2 Treated Water Distributor 3 Membrane Degassing Module 6 First Flow Path Switching Means (Four Way Valve) 11 Second Flow Path Switching Means (Three Way Valve) 15 Detecting Means 19 Treated Water Supply Line 20 Waste Water Discharge Line 21 Filtration Excess device

Claims (2)

[Claims] 1. A deaerator comprising a membrane degassing module 3 connected in a water supply line between a raw water supply unit 1 and a treated water distribution unit 2, wherein the raw water supply unit 1 and the membrane degassing unit are provided. A first flow path switching means 6 for switching the flow direction of the raw water into the membrane type degassing module 3 is provided between the module 3 and the module 3.
A sewage discharge line 20 is branched from a treated water supply line 19 between the membrane type degassing module 3 and the treated water distribution unit 2, and the treated water supply line 19 and the sewage discharge line 20 are branched to the branch point. Reverse flow water cleaning of a deaerator characterized in that a second flow path switching means 11 for switching is provided, and a detection means 15 for controlling the first flow path switching means 6 and the second flow path switching means 11 is provided. mechanism. 2. A deaerator comprising a membrane degassing module 3 connected in a water supply line between a raw water supply unit 1 and a treated water distribution unit 2, wherein the raw water supply unit 1 and the membrane degassing unit are connected. A first flow path switching means 6 for switching the flow direction of the raw water into the membrane type degassing module 3 is provided between the module 3 and the module 3.
A sewage discharge line 20 is branched from a treated water supply line 19 between the membrane type degassing module 3 and the treated water distribution unit 2, and the treated water supply line 19 and the sewage discharge line 20 are branched to the branch point. A second flow path switching means 11 for switching is provided, a detection means 15 for controlling the first flow path switching means 6 and the second flow path switching means 11 is provided, and further, the waste water discharge line 20 is provided to the raw water supply section 1. A reverse water washing mechanism for a deaerator, which is connected to and provided with a filtration device 21 in the wastewater discharge line 20.