JPH1122911A - Deaerator and its operation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the number of revolutions of a pump supplying liquid to be deaerated on the basis of the direction of a flow of a line of treating liquid, and on the other hand detect the vacuum pressure inside the vacuum suction line and considerably lower the power consumption of the two pumps, by controlling the number of revolutions of the vacuum pump on the basis of the detection value. SOLUTION: In this device a deaerating means 3 and a vacuum pump 7 are connected by a vacuum suction line 10 in a setup to subject to vacuum deaeration the liquid to be deaerated inside the deaerating means 3 by the use of the vacuum pump 7. In this instance the deaerating means 3 and a water storage tank 1 are connected by a feeding line 5 equipped with a pump 14 for liquid to be deaerated and by a treating liquid line 6 in a manner of forming a circulation line. Furthermore, a feedwater line 2 is connected to the treating liquid line 6, a flow direction detective means 17 is provided in the treating liquid line 6 between the connection point of the feedwater line 2 and the water storage tank 1, and each of a pressure sensor 11 for detecting the vacuum pressure inside the deaerating means 3 or inside the vacuum suction line 10, the pump 14, the vacuum pump 7, and the flow direction detective means 17 are connected to a controller 16 through signal lines 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deaeration device capable of improving the energy saving effect and a method of operating the same.

[0002]

2. Description of the Related Art As is well known, the supply of water to cooling and heating equipment such as boilers and coolers, or water supply pipes of buildings, etc. is a measure to prevent corrosion of these equipments and red water due to corrosion of water supply piping systems of buildings and the like. It is necessary to incorporate a deaerator.
For example, FIG. 6 shows a building water supply system provided with a deaerator, and the building water supply system shown in FIG.
2, water supply line 33, deaerator 34 and deaeration line 3
5. In these configurations, the degassing operation is performed by circulating the water in the elevated water tank 31 through the degassing line 35 by the action of the degassing device 34, and the water is supplied to the load 32 through the water supply line 33 as necessary. It has become. Therefore, the inside of the water supply line 33 is always filled with deaerated water, and the generation of red water can be prevented. And in the deaeration line 35,
A circulation pump 36 and a valve 37 are inserted, and a water receiving tank 38 is connected to the elevated water tank 31 via a raw water supply line 39 in which a pump 40 is inserted.

Since the water in the elevated water tank 31 is deaerated while circulating through the deaeration line 35, when the amount of water supplied to the building water supply system is reduced, the water in the elevated water tank 31 is reduced. The degree of deaeration of water is increased by excessive circulation, and the amount of dissolved gas exhausted by the deaerator 34 is reduced. Therefore, degassing by excessively circulating degassed water is a problem in energy saving.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to improve the energy saving effect of a deaerator in view of the above problems.

[0005]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and the invention according to the first aspect is characterized in that the degassing means and the vacuum pump are connected via a vacuum suction line. A deaerator for connecting and vacuum degassing the degassed liquid in the degassing means by the vacuum pump, wherein the degassing means and a water storage tank are provided with a supply line for a degassed liquid having a pump. A processing liquid line is connected to form a circulation line, a water supply line is connected to the processing liquid line, and a flow direction detecting means is provided in the processing liquid line between the connection point of the water supply line and the water storage tank. A pressure sensor for detecting a vacuum pressure in the degassing means or the vacuum suction line, the pump, the vacuum pump, and the flow direction detecting means connected to a controller via signal lines, respectively. According to a second aspect of the present invention, there is provided the operation method of the deaerator according to the first aspect, wherein the rotation speed of the pump is controlled based on a flow direction detected by the flow direction detection means. In addition, the number of rotations of the vacuum pump is controlled based on a detection value detected by the pressure sensor. The invention according to claim 3, wherein the deaerator and the vacuum pump are connected to a vacuum suction line. A deaerator for vacuum degassing the degassed liquid in the degassing means by the vacuum pump, wherein the degassing means and a water storage tank are provided with a pump. A supply line and a processing liquid line are connected to form a circulation line, a water supply line is connected to the processing liquid line, a flow rate detection unit is provided in the water supply line, and the deaeration unit or the vacuum suction line is connected. Detect vacuum pressure Force sensors, wherein and pump and characterized by connecting said vacuum pump and said flow rate detection means to the control device via the signal line, and the invention described in claim 4, claim 3
The method of operating a degassing device according to claim 1, wherein the number of rotations of the pump is controlled based on a detection value detected by the flow rate detection unit, and the vacuum is controlled based on a detection value detected by the pressure sensor. It is characterized in that the rotation speed of the pump is controlled.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described. The present invention is realized in, for example, a deaerator installed as a measure for preventing red water in a building water supply system or the like. This deaeration apparatus is configured to supply a deaeration means (for example, a membrane deaeration module formed by a gas permeable membrane such as a hollow fiber membrane) and a water storage tank with a supply line provided with a pump for supplying a deaerated liquid and a treatment liquid line. And forming a circulation line, connecting a water supply line for supplying deaerated water to the load side to the treatment liquid line, and connecting the treatment liquid line between the connection point of the water supply line and the water storage tank. A flow direction detecting means (for example, a flow switch) is provided. Further, a vacuum pump (for example, a water-sealed vacuum pump) is connected to the deaeration means via a vacuum suction line, and a pressure sensor for detecting a vacuum pressure is provided in the vacuum suction line. The pump, the flow direction detecting means, the vacuum pump, and the pressure sensor are each connected to a controller via a signal line. Further, the deaeration means may be a deaeration tower system, for example, and a pressure sensor for detecting a vacuum pressure may be provided in the deaeration tower.

[0007] According to the method of operating the deaerator having the above structure,
When the flow direction detection means provided in the processing liquid line detects the flow direction to the water storage tank side, the processing amount for processing the liquid to be degassed by the deaeration means is equal to the amount of water supplied to the load side. The pump is switched from a high-speed operation to a low-speed operation so as to reduce the supply amount of the deaerated liquid. Further, when the flow direction detecting means detects the flow direction to the water supply line side, it is determined that the amount of water supplied to the load side is larger than the processing amount for processing the deaerated liquid by the deaerator. Then, the pump is switched from low-speed operation to high-speed operation so as to increase the supply amount of the deaerated liquid.
On the other hand, when controlling the operation of the vacuum pump, the pressure sensor detects a vacuum pressure in the vacuum suction line, and when the detected value reaches a preset lower limit pressure value (for example, 40 torr), the vacuum pump is operated at a high speed. When the detected value reaches a preset upper limit pressure value (for example, 80 torr), the vacuum pump is switched from the low speed operation to the high speed operation. The rotation speeds of the pump and the vacuum pump are controlled by a control signal of the controller based on detection signals of the flow direction detecting means and the pressure sensor. The rotation speeds of the two pumps are controlled by an inverter built in the controller.

As described above, according to the operation method of the present invention, the flow direction detecting means provided in the processing liquid line detects the flow direction of the processing liquid, and supplies the liquid to be degassed based on this flow direction. Control the number of rotations of the pumps, while detecting the vacuum pressure in the vacuum suction line, and controlling the number of rotations of the vacuum pump based on the detected value. Can be reduced.

In the above embodiment, the processing liquid line is provided with the flow direction detecting means.
To explain an alternative embodiment, a flow rate detecting means (for example, a flow meter) is provided in a water supply line, and the number of revolutions of a pump is controlled based on a detection value detected by the flow rate detecting means. That is, when the flow rate is larger than a preset flow rate (for example, the intermediate discharge amount of the pump), the pump is operated at high speed, and when it is smaller, the pump is operated at low speed. Further, the control of the vacuum pump is the same as that of the above-described embodiment, and the detailed description is omitted. As mentioned above,
The driving method of this embodiment is also similar to the above-described embodiment.
Since the number of rotations of the pump for supplying the degassed liquid is controlled based on the amount of water supplied to the load side, the same effect as described above is obtained.

[0010]

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 view schematically showing a first embodiment of the present invention.

FIG. 1 schematically illustrates the structure of a deaerator according to the present invention. In the first embodiment, the present invention is applied to, for example, a building water supply system or the like. The deaerated liquid is circulated into predetermined deaerated water, and the deaerated water is supplied to the load side (not shown) via the water supply line 2. This is an embodiment of a deaerator configured as a deaerator 3 of the above deaerator with a membrane deaerator module 4 formed of a gas permeable membrane such as a hollow fiber membrane. A supply line 5 having a pump 14 for supplying the liquid to be degassed is connected to one side of the membrane deaeration module 4. The other end of the supply line 5 is connected to the water storage tank 1.
It is connected to the. Then, the pump 14 is connected to the signal line 15.
Is connected to the controller 16 via the. On the other hand, a processing liquid line 6 for taking out a processing liquid is connected to the other side of the membrane degassing module 4, and the other end of the processing liquid line 6 is connected to the water storage tank 1. Therefore,
The treatment liquid line 6 and the supply line 5 form a circulation line between the water storage tank 1 and the membrane deaeration module 4. Then, the water supply line 2 is connected to the processing liquid line 6, and a flow switch 17 as a flow direction detecting means is provided in the processing liquid line 6 between the connection point of the water supply line 2 and the water storage tank 1. I have. The flow switch 17 is also connected to the controller 16 via the signal line 15.

A means for vacuum degassing the inside of the membrane degassing module 4 is, for example, a water ring type vacuum pump 7.
As a general configuration of the vacuum pump 7, a water sealing line 8
And an exhaust line 9. The vacuum pump 7 and the membrane degassing module 4 are connected by a vacuum suction line 10, and a pressure sensor 11 for detecting a vacuum pressure in the membrane degassing module 4 is provided on the vacuum suction line 10. I have. As the pressure sensor 11, a semiconductor pressure sensor configured so that the pressure range can be set in a stepless manner is suitable.

The vacuum suction line 10 is provided with an automatic valve 12 such as an electromagnetic valve for starting and stopping a vacuum suction operation in the membrane degassing module 4 and a check valve 13. The automatic valve 12, the pressure sensor 11, and the vacuum pump 7 are respectively connected to a controller 16 via a signal line 15. The controller 16 controls the vacuum pump 7 based on the detection signal of the pressure sensor 11 and the flow direction detection signal of the flow switch 17.
Further, an inverter (not shown) for controlling the rotation speed of the pump 14 is incorporated.

Here, the vacuum pressure in the membrane degassing module 4 and the degree of degassing of the liquid to be degassed (dissolved oxygen concentration, ie, DO
2 is shown in FIG. 2, for example, when tap water is used as the liquid to be degassed. In FIG. 2, when the initial dissolved oxygen concentration of the tap water is set to 8 ppm and the predetermined dissolved oxygen concentration after deaeration of the tap water is set to 0.5 ppm, the vacuum pressure in the membrane degassing module 4 is set to about 40 torr.
It may be set to ~ 80 torr. That is, the lower limit of the vacuum pressure in the membrane degassing module 4 is set to 40 torr, and the upper limit is set to 80 torr.

Next, the operation method of the present invention will be described. This operation method is based on the amount of water supplied to the load side.
The amount of the deaerated liquid supplied to the deaeration means 3 is controlled. That is, when the flow switch 17 detects the flow direction toward the water storage tank 1, the processing amount of the deaerated liquid by the deaerator 3 is larger than the water supply amount supplied to the load side. Thus, the pump 14 is switched from high-speed operation to low-speed operation so as to reduce the supply amount of the liquid to be degassed. The flow switch 17
However, when the direction of flow to the water supply line 2 is detected, it is determined that the amount of water supplied to the load side is larger than the amount of treatment of the liquid to be degassed by the deaeration means 3, and The pump 14 is switched from a low-speed operation to a high-speed operation so as to increase the gas-liquid supply amount. On the other hand, the vacuum pump 7
Is controlled by the pressure sensor 11 detecting the vacuum pressure in the vacuum suction line 10, and when the detected value reaches a preset lower limit pressure value of 40 torr, the vacuum pump 7
Is switched from high-speed operation to low-speed operation, and when the detected value reaches a preset upper limit pressure value of 80 torr, the vacuum pump 7 is switched from low-speed operation to high-speed operation. The rotation speeds of the pump 14 and the vacuum pump 7 are controlled by the flow switch 17 and the pressure sensor 11.
Is performed by the control signal of the controller 16 based on the detection signal. The control of the rotational speeds of the two pumps 7 and 14 is performed by an inverter built in the controller 16.

As described above, according to the operating method of the present invention, the flow switch (flow direction detecting means) 17
The flow direction of the processing solution is detected, the rotation speed of the pump 14 is controlled based on the flow direction, the vacuum pressure in the vacuum suction line 10 is detected, and the vacuum pump 7 is detected based on the detected value. Control the rotation speed of
The power consumption of the two pumps 7 and 14 can be greatly reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, a flow meter 18 is provided in the water supply line 2 of the deaerator described in the first embodiment as flow rate detecting means for detecting the amount of water supplied to the load side. Since the supply amount of the liquid to be degassed to be supplied to the deaeration means 3 is controlled based on the detected value, the members other than the flow meter 18 are given the same reference numerals as in the first embodiment. However, duplicate description will be omitted.

FIG. 3 is an explanatory view schematically showing the structure of the deaerator of the second embodiment. In FIG. 3, a flow meter 18 is provided in the water supply line 2 as flow rate detecting means.
The flow meter 18 is connected to the controller 16 via a signal line 15.
It is connected to the. Then, based on the detection value detected by the flow meter 18, the rotation speed of the pump 14 for supplying the liquid to be degassed is controlled. That is, in the operation method of the second embodiment, the flow rate of the deaerated water supplied to the load side is a preset flow rate (for example, the intermediate discharge amount of the pump 14)
When it is larger, the pump 14 is operated at high speed, and when it is smaller, the pump 14 is operated at low speed. The rotation speed of the pump 14 is controlled by the control signal of the controller 16 based on the detection signal of the flow meter 18 as in the first embodiment. As described above, also in the second embodiment, based on the supply amount of degassed water supplied to the load side,
Since the number of revolutions of the pump 14 is controlled, the same effects as in the first embodiment can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, since the deaeration means 3 described in the first embodiment is changed from a membrane deaeration module 4 to a mechanical deaeration tower 19, members other than the deaeration means 3 are used. Are denoted by the same reference numerals as in the first embodiment, and redundant description will be omitted. Further, the operation method is the same as that of the first embodiment, and therefore the detailed description is omitted.

FIG. 4 is an explanatory view schematically showing the structure of the deaerator of the third embodiment. In FIG. 4, a supply line 5 provided with a deaeration tower 19 applied as the deaeration means 3 and provided with a pump 14 for supplying the liquid to be deaerated above the deaeration tower 19
And a spray nozzle 5 a is provided at the tip, and the other end is connected to the water storage tank 1. Further, a processing liquid line 6 for taking out the degassed liquid is connected to a lower portion of the degassing tower 19, and the other end of the processing liquid line 6 is connected to the water storage tank 1, so that the circulation is performed in the same manner as described above. Forming a line. The water supply line 2 is connected to the processing liquid line 6, and a flow switch 17 as a flow direction detecting means is provided in the processing liquid line 6 between the connection point of the water supply line 2 and the water storage tank 1. . The flow switch 17 and the pump 14 are connected to a controller 16 via a signal line 15.

As a means for vacuum degassing the inside of the degassing tower 19, for example, a water ring type vacuum pump 7 is provided, and the vacuum pump 7 and the upper part of the degassing tower 19 are connected by a vacuum suction line 10. doing. In the degassing tower 19,
A pressure sensor 11 for detecting a vacuum pressure in the degassing tower 19 is provided below the position where the vacuum suction line 10 is connected. The vacuum suction line 10 includes:
An automatic valve 12 such as a solenoid valve and a check valve 13 are provided.
The automatic valve 12, the pressure sensor 11, and the vacuum pump 7 are connected to a controller 16 via a signal line 15, respectively.
Connected to each other. The controller 16 controls the rotation speeds of the vacuum pump 7 and the pump 14 based on the detection signal of the pressure sensor 11 and the flow direction detection signal of the flow switch 17 as in the first embodiment.

Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the water supply line 2 described in the third embodiment is provided with a flow meter 18 as flow rate detecting means for detecting the amount of water supplied to the load, and the detected value detected by the flow meter 18 Since the supply amount of the liquid to be degassed to be supplied to the deaeration means 3 is controlled based on
Members other than the flow meter 18 are denoted by the same reference numerals as in the third embodiment, and redundant description will be omitted.

FIG. 5 is an explanatory view schematically showing the structure of the deaerator of the fourth embodiment. In FIG. 5, a flow meter 18 is provided in the water supply line 2 as flow rate detecting means.
Then, based on the detection value detected by the flow meter 8, the rotation speed of the pump 14 for supplying the liquid to be degassed is controlled. The operation method of the fourth embodiment is the same as that of the second embodiment, and a detailed description thereof will be omitted.

[0024]

As described above, according to the present invention, the flow direction detecting means provided in the processing liquid line detects the flow direction of the processing liquid, and supplies the liquid to be degassed based on this flow direction. While controlling the number of rotations of the pump, the pressure sensor detects the vacuum pressure in the vacuum suction line, and based on the detected value, the number of rotations of the vacuum pump is controlled. It can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a configuration of a first embodiment of a deaerator according to the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a vacuum pressure and a DO value in the membrane degassing module of FIG.

FIG. 3 is an explanatory view schematically showing a configuration of a second embodiment of the deaerator according to the present invention.

FIG. 4 is an explanatory view schematically showing a configuration of a third embodiment of a deaerator according to the present invention.

FIG. 5 is an explanatory view schematically showing a configuration of a fourth embodiment of a deaerator according to the present invention.

FIG. 6 is a schematic explanatory view showing a state in which a conventional deaerator is installed in a building water supply system.

[Explanation of symbols]

 Reference Signs List 3 Degassing means 4 Membrane degassing module 5 Supply line 6 Processing liquid line 7 Vacuum pump 10 Vacuum suction line 11 Pressure sensor 14 Pump 15 Signal line 16 Controller 17 Flow switch (Flow direction detecting means) 18 Flow meter (Flow rate detecting means) )

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Osamu Tanaka 7th Horie-cho, Matsuyama-shi, Ehime

Claims (4)

[Claims] 1. A deaerator for connecting the deaeration means 3 and a vacuum pump 7 via a vacuum suction line 10 to vacuum deaerate the liquid to be deaerated in the deaeration means 3 by the vacuum pump 7. In addition, the degassing means 3 and the water storage tank 1 are connected by a supply line 5 of a liquid to be degassed equipped with a pump 14 and a processing liquid line 6 to form a circulation line.
The treatment liquid line 6 between the connection point of the water supply line 2 and the water storage tank 1 is provided with a flow direction detecting means 17, and the flow direction detecting means 17 is provided in the deaeration means 3 or the vacuum suction line 10. Pressure sensor 1 for detecting vacuum pressure inside
1, a degassing apparatus wherein the pump 14, the vacuum pump 7, and the flow direction detecting means 17 are connected to a controller 16 via a signal line 15, respectively. 2. The operating method of the deaerator according to claim 1, wherein the rotation speed of the pump is controlled based on a flow direction detected by the flow direction detection means, and the pressure sensor is controlled. Based on the detection value detected by 11,
A method for operating a deaerator, wherein the number of rotations of the vacuum pump 7 is controlled. 3. A deaerator for connecting the deaeration means 3 and a vacuum pump 7 via a vacuum suction line 10 and for vacuum deaeration of the liquid to be deaerated in the deaeration means 3 by the vacuum pump 7. In addition, the degassing means 3 and the water storage tank 1 are connected by a supply line 5 of a liquid to be degassed equipped with a pump 14 and a processing liquid line 6 to form a circulation line.
The water supply line 2 is connected to the water supply line 2, a flow rate detecting means 18 is provided in the water supply line 2, and a pressure sensor 11, the pump 14, and the vacuum pump for detecting a vacuum pressure in the deaeration means 3 or the vacuum suction line 10. 7. A degassing apparatus wherein the flow rate detecting means 7 and the flow rate detecting means 18 are connected to a controller 16 via signal lines 15, respectively. 4. The method for operating a degassing device according to claim 3, wherein the rotation speed of the pump is controlled based on a detection value detected by the flow rate detection means, and the pressure sensor is controlled. Controlling the number of revolutions of the vacuum pump 7 based on the detection value detected by the method.