JP2506261Y2 - Degassed water production equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing deaerated water, and more particularly to a unit type deaerated water producing apparatus suitable for producing deoxygenated water used as boiler water, raw water for chemical reaction, etc. .

[0002]

2. Description of the Related Art Conventionally, oxygen contained in soft water for boiler feed water, water for food production, raw water for chemical reaction, etc. promotes corrosion and rusting of equipment or causes harmful side reactions in chemical reactions. It is known that In order to eliminate various obstacles caused by oxygen, a chemical treatment method of adding an oxygen scavenger to the water, or a physical treatment method of decompressing oxygen in the water by performing a reduced pressure treatment is performed.

By the way, this physical treatment method has the disadvantage of requiring an equivalent amount of energy for high-level deoxidation, but has the advantage of not increasing impurities in water, and a gas-permeable membrane having excellent performance has been developed. Therefore, a relatively small device has been developed and is being used for continuous production of degassed water. An example of such a water degassing device is a device configured as shown in FIG. 2, which is equipped with a degassing module 1 using a large number of hollow fibers and a water-sealing rotary vacuum pump 2. The oxygen in the water passing through the hollow fiber is sucked from the outside through the hollow fiber membrane and is discharged together with the sealing water of the vacuum pump 2.

As a vacuum pump used in such a deaerator, even a gas containing water vapor or water droplets can be sucked without any trouble, and there is no friction part inside the pump, so that the structure is simple, there is little pulsation, and water is sealed. The water-sealed rotary vacuum pump such as the Nash pump is preferably used because it is suitable for continuous operation for a long time because the pump cools. By the way, a part of the water for sealing the pump is discharged together with the exhaust gas, so that it is necessary to constantly supply the water, and the cooling of the pump is more effective.

In the above deaerator, a water supply pipe h for supplying water for the pump must be separately provided. Therefore, as shown in FIG. 3, the sealing water of the vacuum pump 2 is branched from the treated raw water and used, and then the degassing module 1 is used.
A device has also been proposed in which the gas is sucked out together with the gas. In this device, it is not necessary to separately prepare a pipe for supplying sealing water, but since the temperature of the discharged sealing water is high, it is difficult to recycle it.
Moreover, since the amount is not small, it is uneconomical and also has a disadvantage that the drainage channel i is required.

On the other hand, as shown in FIGS. 4 and 5, after the discharged sealed water is once collected in the separation tank 3 to separate the gas, a cooling device 14 and a heat generator are provided to enhance the capacity of the vacuum pump 2. After cooling using the exchanger 15, the vacuum pump 2 is reused.
A device for use as a water seal has also been proposed. But,
When the sealed water is circulated in this way, various problems may occur due to the concentration of the dissolved matter, and there is a problem that a facility for disposing the concentrated waste water is required in addition to the cooling device.

[0007]

Under such circumstances, the present invention does not require a special device for treating the sealing water of the vacuum pump, which reduces the amount of water used and improves the degassing efficiency. It is an object of the present invention to provide an improved degassed water production apparatus that can be increased.

[0008]

The object of the present invention as described above is to provide a gas permeable membrane type degassing module, a water seal type rotary vane type vacuum pump, a pump sealing water / gas separation tank, and raw water. A raw water line leading from the inlet to the inlet of the degassing module through the raw water check valve, the water supply line branch, the recovered water line branch, and the main valve, and the treatment from the outlet of the degassing module to the treated water outlet. A water line, a water supply line for branching from the water supply line branch to a buffer water line branch and a flow rate adjusting valve to supply sealing water to the vacuum pump, and a degassing module through a control valve to the vacuum pump inlet. An intake line, a discharge line communicating from the vacuum pump outlet to the separation tank, a buffer water line communicating from the buffer water line branching portion to the separation tank via a water level adjusting valve of the separation tank, a recovery water pump from the separation tank, and Recovery It can be via the check valve accomplished by degassing water producing device composed of a recovered water line leading to the recovery water line bifurcation.

[0009]

The function of the degassed water production apparatus of the present invention is to use a part of the raw water for degassing as water supply for sealing the water-sealed rotary vane type vacuum pump. After the water is separated, it is returned to the raw water from the branch part of the recovered water line.Since the branch part of the water supply line in the raw water line is upstream of the branch part of the recovered water line, warm sealed water flows backward. Not mixed with the water supply for the vacuum pump,
All are used to raise the temperature of the raw water supplied to the degassing module. Therefore, drainage is not generated while using part of the raw water as sealing water for the vacuum pump.

[0010]

EXAMPLE An example of the degassed water producing apparatus of the present invention is shown in FIG.
In the figure, 1 is a hollow fiber type degassing module, 2 is a Nash type water-sealed rotary blade vacuum pump, 3 is a separation tank for separating gas from discharged sealed water, and 4 is sealing water from which gas has been separated. Recovered water pumps to be sent out, 5, 6 and 7 are flow rate adjusting valves respectively, 8 is a water level adjusting valve for supplying buffer water to the separation tank 3, 9 is a raw water check valve, 10 is a recovered water check valve, 11 Is a main valve, and 12 and 13 are control valves.

Further, a is raw water which reaches the degassing module 1 from the raw water inlet A through the raw water check valve 9, the water supply line branch portion B, the recovered water line branch portion C, the main valve 11 and the flow rate adjusting valve 5 in this order. It is a line, and the water supply line branch portion B and the recovered water line branch portion C are separated by at least 3 cm, preferably 7 cm or more. In addition, b is a treated water line from the degassing module 1 to the treated water outlet D, and c is a seal from the water supply line branch B to the buffer water line branch E, the flow rate adjusting valve 6 and the control valve 12 to the vacuum pump 2. A water supply line for supplying water, d is an intake line from the outside of the hollow fiber membrane of the degassing module 1 to the vacuum pump 2 via the control valve 13, e is a discharge line from the vacuum pump 2 to the separation tank 3, and f Is the buffer water line branch E
From the water level adjusting valve 8 to the separation tank 3,
g is the separation tank 3, the recovered water pump 4, the recovered water check valve 10,
It is a recovered water line that reaches the recovered water line branch portion C through the flow rate adjusting valve 7.

In the degassed water producing apparatus of the present invention, for example, the flow rate adjusting valve 5 is adjusted to 100 l / min, the flow rate adjusting valve 6 is adjusted to 4 l / min, and the flow rate adjusting valve 7 is changed to 5 l / min. l
The pressure is adjusted to / min, the control valve 12 is opened, and the sealing water is supplied to the vacuum pump 2. Next, the vacuum pump 2 is operated, and the main valve 11
The raw water is supplied to the degassing module 1 at 100 l / min, and the control valve 13 is opened to depressurize the outside of the hollow fiber of the degassing module 1 to start degassing the raw water.

In this way, the sealing water discharged from the vacuum pump 2 together with the degassed gas passes through the discharge line e and the separation tank 3
After entering, the gas is separated and returned to the recovered water line branching section C or the 2 raw water line a by the recovered water pump 4 and to the degassing module 1 together with the raw water. Here, since the water supply line branch portion B is located upstream of the recovered water line branch portion C, the temperature of the sealing water supplied from the water supply line branch portion B to the vacuum pump 2 remains low and the recovered water whose temperature has risen. Will raise only the temperature of the raw water supplied to the degassing module 1. In addition, when the water level in the separation tank 3 becomes low, the buffer water is replenished from the buffer water line f by the action of the water level adjusting valve 8, and when the water level does not become low, the replenishment is stopped. It does not cause any problems and does not waste the sealed water.

[0014]

[Effect of the Invention] The deaerated water production apparatus of the present invention returns the sealed water of the water-sealed rotary vane type vacuum pump used by branching from the raw water to the inlet side of the degassing module. Not only is there no need for special equipment for treatment, but the water consumption is also reduced.

[Brief description of drawings]

FIG. 1 is a flow sheet showing the configuration of an example of a degassed water production apparatus of the present invention.

FIG. 2 is a flow sheet showing the configuration of an example of a conventional degassed water production apparatus.

FIG. 3 is a flow sheet showing the configuration of another example of the conventional degassed water producing apparatus.

FIG. 4 is a flow sheet showing the configuration of another example of the conventional degassed water producing apparatus.

FIG. 5 is a flow sheet showing the configuration of still another example of the conventional degassed water producing apparatus.

[Explanation of symbols]

 1 Deaeration Module 2 Vacuum Pump 3 Separation Tank 4 Recovery Water Pump 5, 6, 7 Flow Control Valve 8 Water Level Control Valve 9 Raw Water Check Valve 10 Recovery Water Check Valve 11 Main Valve 12, 13 Control Valve 14 Cooling Device 15 Heat Exchanger A Raw water reception B Water supply line branch C Recovered water line branch D Treated water outlet E Buffer water line branch a Raw water line b Treated water line c Water supply line d Intake line e Discharge line f Buffer water line g Recovered water Line h Sealing water supply pipe i Drainage channel

Claims (2)

(57) [Scope of utility model registration request] 1. A gas-permeable membrane type deaeration module, a water-sealed rotary vane type vacuum pump, a separation tank for pump water and gas, a raw water inlet valve, a raw water check valve, a water supply line branching section, and a recovery unit. A raw water line leading to the inlet of the degassing module through a water line branching part and a main valve in sequence, a treated water line leading from the outlet of the degassing module to a treated water outlet, and a buffer water line branching from the water supply line branching part Water supply line for supplying sealing water to the vacuum pump through the flow section and the flow rate adjustment valve in order, an intake line from the degassing module to the vacuum pump inlet via the control valve, and a vacuum pump outlet to the separation tank. A discharge line, a buffer water line from the buffer water line branch to the separation tank via the water level adjusting valve of the separation tank, and a recovery water pump and a recovery water check valve from the separation tank to the recovery water line branch. Times A degassed water production apparatus comprising a water collection line. 2. The degassed water producing apparatus according to claim 1, wherein the water supply line branch and the recovered water line branch are separated from each other by at least 3 cm.