JP2002086136A - Device for deoxidizing feed water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a feed water deoxidizing device which is provided with a water supply tank 3 provided with a raw water receiving mechanism 10 for receiving raw water We while maintaining a water level within a prescribed range and a degassing tank 4 connected with a water supply pipe line 7 for supplying degassed water Wd to a feed water utilizing position and which converts the raw water We blended with dissolved oxygen extracting gas G by an oxygen extracting gas blending mechanism 8 provided in a raw water supply pipe line 5 into degassed water Wd by gas-liquid separation in the degassing tank 4, capable of easily and simply deoxidizing feed water though the device has a small size and a simple mechanism and can be easily installed. SOLUTION: A partition wall 2 for bisecting the inside of a water tank 1 forming a close space is arranged and one space divided by the partition wall 2 forms the water supply tank 3 and the other space forms the degassing tank 4 and a space between the partition wall 2 and a ceiling 1a of the water tank 1 is formed to a communicating space 18 through which a gas phase space formed at an upper part of the degassing tank 4 communicate with the gas phase space formed at an upper part of the water supply tank 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deoxygenating apparatus for reducing the concentration of dissolved oxygen in feed water in order to prevent corrosion of a boiler water pipe or a header caused by dissolved oxygen in the feed water of a boiler. is there. Specifically, a water supply tank having a raw water receiving mechanism for receiving raw water while maintaining the water level within a predetermined range, and a raw water supply pipe for supplying the raw water received in the water supply tank, are connected to the water supply tank to remove the raw water. A deaeration tank connected to a water supply pipe for supplying deaerated water after the oxygen treatment to a water supply utilization point, and supplying and mixing dissolved oxygen extraction gas to the raw water to the raw water supply pipe. The present invention relates to a deoxygenating device for a feedwater, which is provided with an oxygen extraction gas mixing mechanism, separates raw water mixed with the dissolved oxygen extraction gas into gas and liquid in the degassing tank, and reduces dissolved oxygen in the raw water.

[0002]

2. Description of the Related Art In the above-mentioned conventional water supply deoxidizer, a water supply tank 3 and a deaeration tank 4 are provided separately as shown in FIG. 3, for example. Raw water receiving mechanism 10 that receives raw water Wc while maintaining it within the range
The deaeration tank 4 is connected to the water supply tank 3 by a raw water supply pipe 5 for supplying the raw water Wc received in the water supply tank 3. The deaeration tank 4 is connected to a water supply pipe 7 for supplying the deaerated water Wd obtained by deoxidizing the raw water Wc to a water supply use point as a water supply. Then, a high-purity nitrogen gas, for example, as a dissolved oxygen extraction gas G is supplied to the deaeration tank 4 by bubbling into the raw water Wc supplied from the raw water supply pipe 5, and an interface between the floating bubbles and the water is supplied. Through which the dissolved oxygen in the raw water Wc is extracted into the bubbles. The space above the water surface of the water supply tank 3 is normally in communication with the atmosphere, and an inert gas such as nitrogen gas is supplied as a seal gas to the space above the water surface of the degassing tank 4.

[0003] The water supply line 7 is connected to a boiler water supply line 16 to a boiler 15, and the steam generated by the boiler 15 is supplied to a steam turbine 20 of a steam power generation facility.
The waste steam used in the steam turbine 20 is supplied to a condenser 21.
And the water is returned to the water supply tank 3. In the case of a small boiler, the steam generated by the boiler 15 is supplied as a disposable steam to a location where steam is used.

[0004]

In the structure of the above-described conventional dewatering device for feed water, the shorter the residence time of the dissolved oxygen extraction gas in the raw water, the lower the dissolved oxygen extraction ability becomes. Unless the floating distance of the dissolved oxygen extraction gas floating in the raw water is maintained at a certain level or more, the degassed water in which the residual oxygen concentration (dissolved oxygen concentration after the deoxygenation treatment) has been reduced to a desired oxygen concentration is reduced. Since it cannot be obtained, there is a problem that the deaeration tank must be large. Therefore, in order to compensate for this, the degassing tank is enlarged, or a chemical such as hydrazine hydrochloride is added to the feed water to suppress corrosion caused by dissolved oxygen in the feed water.

Such an increase in the size of the deoxygenation device for water supply or the necessity of adding a chemical has a great disadvantage in, for example, a facility for supplying deoxygenated water to a small boiler. In other words, it is desired that a small boiler has a small and simple configuration and does not require maintenance. In addition, although degassing tanks are decompressed and raw water is deoxygenated under reduced pressure,
This also complicates the device and does not meet the demand for miniaturization and simplification. In addition, oxygen is separated and removed from raw water using a hydrophobic separation membrane. However, there is a problem with the resistance of the membrane material, and there is a limitation on the use temperature and the use of chemicals.

[0006] By the way, high-purity water used as washing water, raw material water for beverages and foods, brewing water, and the like are required to avoid the addition of chemicals and have a low dissolved oxygen concentration. As a deoxygenation device adapted to such applications, a conduit for supplying a stock solution to a tank is provided with an inert gas mixing mechanism for supplying an inert gas into the stock solution and mixing it under pressure, and It has been proposed that the mixed stock solution is decompressed and gas-liquid separated in the tank to reduce dissolved oxygen in the stock water (for example, JP-A-2000-10).
No. 7512). In this proposal, in the tank, an inert gas is supplied as a purge gas while being maintained at a predetermined pressure, and accompanied by oxygen extracted together with the inert gas mixed with the stock solution by the inert gas mixing mechanism. ,
It is configured to be discharged to the outside of the tank. But,
In the oxygen absorber according to the above proposal, high-purity nitrogen is used as the inert gas, and the pressure in the inert gas mixing mechanism is set to 400.
It is said that the concentration of residual oxygen gas can be reduced to about 0.5 ppm only when the supply of nitrogen gas is at least kPa and the amount of nitrogen gas supplied is substantially equal to or more than that of the raw water.

SUMMARY OF THE INVENTION An object of the present invention is to provide a water supply deoxidizing apparatus which can easily and easily deoxidize while having a small and simple mechanism and can be easily installed.

[0008]

[Means for Solving the Problems]

[0009] [Features of the present invention] The water supply deoxygenating apparatus according to the present invention comprises a water tank provided with a raw water receiving mechanism for receiving raw water while maintaining the water level within a predetermined range, and a raw water received in the water tank. A deaeration tank connected to the water supply tank with a raw water supply line to be supplied and connected to a water supply line for supplying deaerated water after deoxidizing the raw water to a water supply utilization point; The supply pipe is provided with an oxygen extraction gas mixing mechanism for supplying and mixing the dissolved oxygen extraction gas to the raw water, the raw water mixed with the dissolved oxygen extraction gas is subjected to gas-liquid separation in the degassing tank, and The dewatering device for reducing the amount of dissolved oxygen is characterized in that a water supply tank and a deaeration tank are integrally formed, and each has the following characteristics.

According to a first characteristic configuration of the water supply deoxidizer according to the present invention, a partition wall for dividing the inside of a water tank forming a closed space into two parts is provided, and the partition wall is divided by the partition wall. A water supply tank is formed in one of the spaces, and a deaeration tank is formed in the other space, and a space between the partition wall and a ceiling of the water tank is formed above the deaeration tank. The point is that it is formed as a communication space that communicates the gas phase space and the gas phase space formed above the water supply tank.

According to a second aspect of the present invention, there is provided a water supply deoxygenating apparatus, wherein the raw water received by the raw water receiving mechanism according to the first aspect is injected toward the water surface in the water supply tank. The point is that it is configured.

According to a third aspect of the water supply deoxidizing apparatus according to the present invention, in the first aspect or the second aspect, a dissolved oxygen extraction gas can be supplied to the deaeration tank. A configuration is such that when the supply amount of the dissolved oxygen extraction gas to the oxygen extraction gas mixing mechanism becomes equal to or less than a predetermined amount, the dissolved oxygen extraction gas is supplied from the seal gas supply passage. It is in the point that has been.

A fourth characteristic configuration of the water supply deoxidizer according to the present invention is that, as set forth in claim 4, a partition wall for dividing the inside of a water tank forming a closed space into two is provided, and the partition wall is divided by the partition wall. A water supply tank is formed in one of the spaces, and a deaeration tank is formed in the other space, and the deaeration tank is provided on the partition wall at a position below the water level of both the deaeration tank and the water supply tank. The present invention is characterized in that a water pipe is provided for flowing degassed water in one direction toward the water supply tank under predetermined conditions.

According to a fifth aspect of the present invention, there is provided a water supply deoxidizing apparatus according to the fifth aspect, wherein the deoxygenating apparatus having any one of the first to fourth aspects is provided in a boiler. A water supply line is installed as a boiler water supply line, and an oxygen extraction gas supply device that supplies dissolved oxygen extraction gas to the oxygen extraction gas mixing mechanism separates nitrogen in the air by pressure fluctuation adsorption separation method. The nitrogen PSA device is configured to supply the exhaust gas after the nitrogen is separated from the nitrogen PSA device, and an exhaust passage for discharging the exhaust gas is connected to a combustion air supply passage to the boiler.

According to a sixth aspect of the present invention, there is provided a water supply deoxidizing apparatus capable of heating raw water in the water supply tank according to any one of the first to sixth aspects. A heating mechanism is provided, and a temperature sensor for detecting the water temperature is provided, and the heating mechanism is provided with a temperature adjustment mechanism capable of adjusting a water temperature detected by the temperature sensor within a temperature range of 30 to 90 ° C. At one point.

[Function and Effect of Characteristic Configuration] According to the water supply deoxidizing apparatus according to the present invention, since the water supply tank and the deaeration tank are integrally formed, the structure is simplified and each of them is separately provided. ,
It has the following unique effects.

[0017] The first embodiment of the feed water deoxidizer according to the present invention is described.
According to the characteristic configuration, manufacture and installation are easy, and
The dissolved oxygen can be sufficiently reduced. That is, since the water supply tank and the deaeration tank are formed as one water tank forming a closed space, the welding length for assembly can be shortened, and the number of steps for manufacturing such as welding work can be reduced. Further, since the water tank is provided with a partition wall to form the water supply tank and the deaeration tank, piping for connecting these can be assembled in advance at the time of installation. There is no need for construction and installation is simplified. Further, a space is provided between the partition wall and the ceiling of the water tank, so that a gas phase space on the water surface of the water supply tank and a gas phase space on the water surface of the deaeration tank communicate with each other. Therefore, even if there is no external pipe for introducing a seal gas into the water supply tank, the dissolved oxygen extraction gas after being mixed with the raw water supplied to the deaeration tank and sent in, and after the raw water has been deoxygenated, At the same time as it covers the water surface of the deaeration tank, it is also sent over the water surface of the water supply tank and covers it. Therefore, since the dissolved oxygen extraction gas is also supplied to the water supply tank, it is possible to prevent oxygen in the air from dissolving in the raw water stored in the temporary water supply tank until the oxygen approaches saturation, and furthermore, to dissolve the dissolved oxygen extraction gas on the water surface. Is covered as a seal gas, so that deoxidation can be performed even in the water supply tank.

[0018] The second embodiment of the water supply deoxidizer according to the present invention is described.
According to the characteristic configuration, the dewatering treatment can be performed on the raw water, especially in the water supply tank, in addition to the effects of the first characteristic configuration. In other words, by injecting the raw water received from the raw water receiving mechanism onto the water surface in the water supply tank, the dissolved oxygen extraction gas covering the water surface is entrained in the raw water and the raw water can be aerated. Since the dissolved oxygen in the raw water in the water supply tank is transferred into the dissolved oxygen extraction gas by the aeration treatment, the deoxygenation processing for extracting the dissolved oxygen from the raw water in the water supply tank becomes possible.

The third embodiment of the water supply deoxidizer according to the present invention.
According to the characteristic configuration, even when the supply amount of the dissolved oxygen extraction gas mixed into the raw water to the deaeration tank is insufficient while exhibiting the operational effects of the first characteristic configuration or the second characteristic configuration, It is possible to prevent redissolution of oxygen in water stored in the degassing tank. That is, the supply amount of the dissolved oxygen extraction gas to the oxygen extraction gas mixing mechanism is insufficient, or the supply amount of the deaeration water from the deaeration tank via the water supply pipe increases, and the water level of the deaeration tank rises. In the case of a decrease, the supply amount of the raw water through the raw water supply pipe decreases, and the supply amount of the dissolved oxygen extraction gas supplied to the raw water to the deaeration tank decreases according to the supply amount, Or, as in the case where the supply of raw water to the deaeration tank is stopped and the supply of dissolved oxygen extraction gas supplied to the deaeration tank together with the raw water is stopped, the inside of the water supply tank or the inside of the deaeration tank is used. Because the water level of the water tank decreases, outside air leaks into a gas phase space formed above the water tank in which the water supply tank and the degassing tank are integrally formed, and both water surfaces are exposed to an oxygen-containing atmosphere, and oxygen is removed. There is a possibility of redissolving, but this may be caused by the dissolved oxygen extraction gas to the oxygen extraction gas mixing mechanism. Corresponds to the case where the supply amount is less than the predetermined amount, so that the dissolved oxygen extraction gas is supplied from the seal gas supply path to the degassing tank, and it is possible to prevent the outside air from leaking into the degassing tank, This also covers the water surface of the water tank, so that it is possible to avoid always increasing the oxygen partial pressure in the gas phase space in the water tank. That is, the predetermined amount is not a fixed amount but a supply amount of the dissolved oxygen extraction gas necessary to prevent the outside air from leaking into the gas phase space.

The fourth embodiment of the water supply deoxidizer according to the present invention is described.
According to the characteristic configuration, the deoxidizing mechanism including the oxygen extraction gas mixing mechanism is made more efficient while simplifying the structure and reducing the manufacturing cost. In other words, the water supply tank and the deaeration tank are provided in an integrally formed water tank, and a dewatering pipe is provided in the water tank by dividing the inside of the water tank into the water supply tank and the deaeration tank. Water can be returned to the raw water, but no extra-tank piping is required. Therefore, the welding construction cost and the piping cost can be reduced, and at the same time, since it has an integral structure without piping outside the tank, the installation is extremely easy while having the water passage. Further, from the water supply pipe, the deoxygenated water is configured to flow into the raw water under predetermined conditions, so that the dissolved oxygen in the raw water in the water supply tank is diluted and sent to the raw water supply pipe. The dissolved oxygen concentration in the raw water is always maintained at or below the dissolved oxygen concentration received from the raw water receiving mechanism. Therefore, in general, the amount of deoxidation that can be performed by the deaerator is set on the basis of the maximum evaporation amount of the boiler if it is provided with a boiler. However, the evaporation amount of the boiler in normal use is one of the maximum evaporation amount. / 3 to 1/2
Therefore, the oxygen extraction gas mixing mechanism provided with the raw water supply pipe has a surplus capacity. Therefore, if the raw water is circulated according to the capacity of the oxygen extraction gas mixing mechanism, the degassed water is returned to the water supply tank from the water passage in normal use. As a result, the dissolved oxygen in the raw water in the water supply tank can be constantly diluted, and the residual oxygen concentration (dissolved oxygen concentration after the deoxygenation treatment) in the deaerated water in the deaeration tank can be further reduced. Be able to maintain.

As described above, since the water supply tank is formed in the water tank which is formed only by being divided by the deaeration tank and the partition wall, the water flow pipe penetrates through the partition wall. Therefore, the above-described effects can be obtained with a simple structure that does not require a pipe for returning the degassed water from the degassing tank to the water supply tank. Here, the predetermined condition usually refers to a time when there is a surplus in the raw water supply via the oxygen extraction gas mixing mechanism as described above. In addition, even when the water level of the deaeration tank becomes higher than the water level of the water supply tank by a predetermined height or more, the water flow conduit allows the deaeration water to flow toward the water storage tank.

The fifth aspect of the above-described feed water deoxygenation apparatus according to the present invention.
According to the characteristic configuration, the oxygen extraction gas supply device can be efficiently operated when the boiler is installed together with the boiler, while exhibiting the operation and effect of any of the first to fourth characteristic configurations. Efficiency can also be improved. That is, since the nitrogen PAS apparatus separates nitrogen in air with a purity of 99 to 99.99%, the exhaust gas after sampling nitrogen has a high oxygen ratio of, for example, about 27%. . Therefore, if this is supplied to the combustion air supply path of the boiler, oxygen-enriched air will be supplied, and the combustion temperature in the combustor can be increased. As a result, it is possible to increase the efficiency of the boiler while preventing corrosion of the boiler with equipment that is easy to install and handle.

The sixth aspect of the water supply deoxidizer according to the present invention.
According to the characteristic configuration, the running cost can be reduced while the operation and effect of any of the first to fifth characteristic configurations are exhibited. In other words, the raw water in the water tank is 30-90 ° C.
If the raw water is supplied to the oxygen-extracting gas mixing mechanism while maintaining the set temperature within the above temperature range, the solubility of the gas such as oxygen is reduced by maintaining the temperature of the raw water within the above temperature range. The equilibrium partial pressure of oxygen in the oxygen-extracted gas increases, and the dissolved oxygen easily escapes into the bubbles of the dissolved-oxygen-extracted gas mixed and stirred. Therefore, even if the purity of the dissolved oxygen extraction gas is lowered or the supply amount of the dissolved oxygen extraction gas is somewhat reduced, the residual oxygen concentration in the degassed water (the dissolved oxygen concentration after the deoxygenation treatment) is reduced. It can be kept low. By the way, the above-mentioned heating temperature range is a temperature that can be heated by hot wastewater, and when it is installed in a boiler, it can be heated by its waste steam, and the degassing efficiency is improved by waste heat. You can.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a water supply deoxidizing apparatus according to an embodiment of the present invention; Elements having the same or similar functions as those of FIG. 3 used in the description of the related art are given the same or related reference numerals as those of FIG. A part of the description will be omitted.

In the water supply deoxidizer according to the present invention, for example, as shown in FIG. 1, the water supply tank 3 and the deaeration tank 4 are formed integrally. That is, the partition wall 2 which divides the inside of the water tank 1 forming one closed space into two in the horizontal direction is provided, and the water supply tank 3 is formed in one space divided by the partition wall 2 and in the other space. The deaeration tank 4 is formed. The water supply tank 3 is provided with a raw water receiving mechanism 10 composed of a ball tap valve that receives raw water Wc in a range below a predetermined water level. At the outlet opening of the ball tap valve which is the raw water receiving mechanism 10, a water supply nozzle 10a for injecting the received raw water Wc toward the water surface in the water supply tank 3 is attached. The deaeration tank 4
Is connected to a water supply pipe 7 for supplying the deaerated water Wd obtained by subjecting the raw water Wc to a deoxygenation treatment to a water supply utilization point. The water supply tank 3 and the deaeration tank 4 are connected to a raw water supply pipe 5 for supplying the raw water Wc received in the water supply tank 3.
The discharge end 5a of the raw water supply pipe 5 is opened downward below the water surface of the degassing tank 4 near the bottom.

The raw water supply pipe 5 is provided with an oxygen extraction gas mixing mechanism 8 for supplying and mixing the dissolved oxygen extraction gas G into the raw water Wc. Oxygen extraction gas supply device 9 for supplying G
A nitrogen PSA unit 9A for separating and supplying nitrogen in the air by a pressure fluctuation adsorption separation method is provided, and as the dissolved oxygen extraction gas G, the purity separated from the air is about 99.5.
% Nitrogen gas is supplied. The raw water supply line 5
In the process of flowing, the dissolved oxygen extraction gas G stirred and mixed by the oxygen extraction gas mixing mechanism 8 becomes fine bubbles,
The dissolved oxygen in the raw water Wc is extracted into the fine bubbles. In other words, the deaerated water Wd in the deaeration tank 4 is sent as deaerated water Wd in which bubbles of a dissolved oxygen extraction gas G containing extracted and dissolved oxygen in the raw water Wc are mixed. Thus, the dissolved oxygen extraction gas G is mixed into the raw water Wc, and the dissolved oxygen is extracted into the bubbles of the dissolved oxygen extraction gas G to generate deaerated water Wd, and the bubbles accompanying the deaerated water Wd are generated. Is gas-liquid separated from the degassed water Wd in the degassing tank 4, and the degassed water Wd is supplied from the water supply line 7.
The air bubbles float from the discharge end 5a of the raw water supply pipe 5 toward the surface of the deaerated water Wd, and separate from the deaerated water Wd. As a result, the concentration of residual oxygen in the degassed water Wd (the concentration of dissolved oxygen after the deoxygenation treatment) is reduced to at least 1 ppm or less.

The oxygen extraction gas mixing mechanism 8 is interposed in the raw water supply pipe 5 and supplies the dissolved oxygen extraction gas G into the raw water Wc supplied by the supply pump 5b. A stirring and mixing section 8b for mixing the raw water Wc with the dissolved oxygen extraction gas G to form fine bubbles of the dissolved oxygen extraction gas G;
and a mixing pressure control valve 8c provided in the raw water supply pipe line 5 downstream of the outlet b. The dissolved oxygen extraction gas G is supplied to the raw water detected by a flow meter 5c provided in the raw water supply pipe 5 by adjusting the opening of a flow control valve 9b provided in a supply path of nitrogen gas from the nitrogen PSA device 9A. The supply amount is adjusted so as to have a predetermined flow rate with respect to the supply amount. In the example shown in the figure, the stirring and mixing section 8b includes a straight pipe forming a main body, and a swirl blade formed by twisting a band plate around the axis of the straight pipe in the straight pipe. It is composed of a static mixer fixed in the straight pipe. The extraction gas supply unit 8a is provided with a dissolved oxygen extraction gas supply nozzle that is inserted into the raw water supply pipe 5 along the axis of the static mixer and has a tip opening in the immediate vicinity of the swirling blade. The nitrogen gas G from the nitrogen PSA device 9A is supplied to the dissolved oxygen extraction gas supply nozzle. The nitrogen gas G has a supply ratio set in a volume ratio (standard state) of 0.2 to 1 with respect to the flow rate of the raw water Wc detected by the flow meter 5c provided in the raw water supply pipe line 5. Thus, the supply is regulated. The mixing pressure control valve 8c is provided downstream of the outlet of the static mixer, and adjusts the water pressure in the oxygen extraction gas mixing mechanism 8 within a range not higher than the discharge pressure of the supply pump 5b. The pressure adjustment range is from 196 to
981 kPa (1 to 10 kgf / cm ² ). It is desirable that the position of the distal end opening of the dissolved oxygen gas supply nozzle is located near the inlet side end of the swirling blade in accordance with the axis of a straight pipe forming the main body.

The upper edge of the partition wall 2 and the lid L of the water tank 1
In the space between the ceiling 1a and the space formed above, a communication space 18 communicating between a gas phase space formed above the degassing tank 4 and a gas phase space formed above the water supply tank 3 is formed. I do.
Further, on the partition wall 2, the deaerated water Wd in the deaeration tank 4 is moved to a position below the water level of both the deaeration tank 4 and the water supply tank 3 in one direction toward the water supply tank 3. , A water passage 6 for flowing under predetermined conditions is provided. The lid L is attached to the water tank 1
On the upper edge of the side wall. One of the predetermined conditions is based on the difference between the water level of the deaeration tank 4 and the water level of the water supply tank 3, and opens and closes the water passage 6 in one direction under the predetermined conditions. In order to do so, the water pipe 6 is bent downward toward the degassing tank 4 and a check valve 6a that opens and closes passively with a differential pressure between the upper and lower parts is provided in a part of the pipe in the vertical direction. Provide. The check valve 6a is configured so that, for example, the valve body has one or more appropriate bulk specific gravities,
It is possible to adopt a structure in which a valve seat is provided in a vertical pipe portion curved downward toward the water passage 6 and the valve body is seated above the valve seat. With such a configuration, the valve can be opened by pushing up the valve body by the difference between the water head in the deaeration tank 4 and the water head in the water supply tank 3. With this structure, if the difference between the heads is small, the valve will close due to the weight of the valve body,
Raw water Wc in the water supply tank 3 can be prevented from flowing into the deaeration tank 4.

The gas phase space above the water supply tank 3 and the space above the degassing tank 4 are communicated via the communication space 18 so that the water level of the water supply tank 3 and the water level of the degassing tank 4 are lowered. Both are configured to communicate with each other under predetermined conditions through the water passage 6. For example, as shown in FIG. 2, when this deoxidizer is attached to a boiler 15 such as a simple boiler or a small boiler, for example, the steam generation amount of the boiler 15 is 1 ton / h.
In the case of, the steam amount in normal use is about 300 kg / h. Therefore, during normal use, the deaerated water Wd of about 300 to 500 kg / h
Is supplied from the water supply line 7 to the boiler 15. Therefore, if 1 ton / h of raw water Wc is supplied from the water supply tank 3 to the oxygen extraction gas mixing mechanism 8 via the raw water supply pipe 5 in a fixed amount according to the capacity of the boiler 15, 500
The deaerated water Wd of up to 700 kg / h is supplied to the deaeration tank 4 in excess. Then, the surplus deaerated water Wd can be returned to the water supply tank 3. In this way, by circulating about half to 2/3 of the degassed water Wd, the dissolved oxygen in the raw water Wc temporarily stored in the water supply tank 3 can be diluted, and the dissolved oxygen concentration can be further reduced by the subsequent deoxygenation treatment. Thus, the concentration of dissolved oxygen in the degassed water can be kept much lower than that of the conventional deoxidizer.

On the other hand, the raw water Wc spouting from the water supply nozzle 10a attached to the ball tap valve is blown onto the water surface, entrains gas covering the water surface, and penetrates below the water surface of the raw water Wc. Thus, the entrained gas becomes bubbles and floats in the raw water Wc below the water surface. The gas that forms the floating bubbles is a dissolved oxygen extraction gas G that has separated from the degassed water Wd in the degassing tank 4, that is, contains dissolved oxygen extracted from the raw water Wc. The ratio is extremely low compared to air.
The dissolved oxygen in the raw water Wc is preliminarily extracted by the bubbles floating in the raw water Wc. The water tank 1
The ceiling 1a has a discharge port 19 at a position above the raw water receiving mechanism 10 for discharging gas in the gas phase space to the outside, and the discharge port 19 has a rubber sheet as a valve body. A reed valve 19a is provided as a check valve, and while the excess seal gas in the gas phase space can be discharged,
9 prevents the outside air from leaking into the gas phase space.

Further, the water supply tank 3 is provided with a weir formed to be higher than the water surface in the tank, and the first section 3a, the second section 3b, and the like from the raw water receiving mechanism 10 toward the section wall 2.
It is divided into three areas of the third section 3c. Each section 3a, 3
The weir between b and 3c has a flow hole at a position below the water surface. The float of the ball tap valve is located in the second section 3b. And, in the first section 3a,
A heating mechanism 12 capable of heating the raw water Wc temporarily stored in the tank is provided, and a temperature sensor 13 for detecting the water temperature is provided by a weir for partitioning between the first section 3a and the second section 3b. Provided in accordance with the height of the flow hole from the first section 3a to the second section 3b. The water supply line 7 is
It is connected to the bottom of the third section 3c. The second section 3
The flow hole from the second section 3b to the third section 3c provided in the weir between b and the third section 3c is higher than the height of the flow hole from the first section 3a to the second section 3b. .
Thus, the temperature sensor 13 is configured to detect the temperature of the raw water flowing into the second section 3b.

The heating mechanism 12 is constituted by a steam-heated heat transfer tube immersed in the raw water Wc in the water supply tank 3. The heating mechanism 12 detects the water temperature detected by the temperature sensor 13. Temperature adjusting mechanism 14 for adjusting the temperature within a predetermined temperature range
Is provided. The temperature control mechanism 14 is constituted by a flow rate control valve provided in a steam supply path to the heating mechanism 12, and the opening of the flow rate control valve is adjusted in accordance with the temperature detected by the temperature sensor 13. The temperature of the raw water Wc in 3 is adjusted based on the target temperature set in the range of 30 to 90 ° C. As shown in the figure, the temperature sensor 13 is connected to the raw water W at the position of the flow hole from the first section 3a to the second section 3b.
By detecting the temperature of c, at least the temperature of the raw water Wc in the second section 3b is reliably maintained in a predetermined range. Thus, the raw water supply line 5
By maintaining the temperature of the raw water Wc supplied to the water within the range of 30 to 90 ° C., the solubility of oxygen in the raw water Wc is reduced, and bubbles of the dissolved oxygen extraction gas G mixed by the oxygen extraction gas mixing mechanism 8 are generated. The dissolved oxygen in the raw water Wc is made to escape easily.

As described above, this deoxygenating apparatus is used for the boiler 15
In order to supply boiler feed water to the deaerated water Wd, it is desirable to maintain the concentration of dissolved oxygen in the degassed water Wd at 0.5 ppm or less. The above setting is preferable, and the deaeration efficiency of the deoxidizer can be improved. The dissolved oxygen concentration in the degassed water Wd is determined by the nitrogen PSA device 9
It can be adjusted by appropriately adjusting the purity of the nitrogen gas supplied from A, its supply ratio to the flow rate of the raw water Wc (standard state), the pipe pressure in the oxygen extraction gas mixing mechanism 8, the temperature of the raw water Wc, and the like.

The heating mechanism 12 has a function of indirectly keeping the temperature of the deaeration tank 4 because the water supply tank 3 is constituted only by the deaeration tank 4 and the partition wall 2. As a result, the degassing efficiency in the degassing tank 4 is further increased. In addition, when the steam recovery water obtained by collecting the steam from the attached boiler 15 in addition to the supplied raw water Wc is returned to the water supply tank 3, the heating mechanism 12 controls the temperature of the steam recovery water. Is 60 to 80 ° C., and this heat can be used. For example, when the target temperature is set to around 60 ° C., the operation may not be required.

As shown in FIG. 2, the above-described deoxygenating device for water supply is provided in addition to the boiler 15, and the water supply line 7 is provided as a boiler water supply line 16. An exhaust passage 9a for exhausting exhaust gas after separating nitrogen from the nitrogen PSA device 9A is connected to a combustion air supply passage 17 to the boiler 15. The exhaust path 9a
Is the gas remaining after adsorbing and separating nitrogen in the air, almost all of the oxygen in the air remains,
In the combustion air supply passage 17, for example, an oxygen concentration of 28%
Of oxygen-enriched air will be supplied. Therefore, without using oxygen that causes a cost increase as in the past,
This has the additional effect that the boiler efficiency can be greatly improved by increasing the combustion temperature in the boiler.

Further, the degassing tank 4 is connected with a seal gas supply path 11 capable of supplying the dissolved oxygen extraction gas G, and supplies the dissolved oxygen extraction gas G to the oxygen extraction gas mixing mechanism 8. When the amount becomes equal to or less than a predetermined amount, the seal gas supply valve 11a provided in the seal gas supply path 11 is opened to supply the dissolved oxygen extraction gas G to the deaeration tank 4. . In this deoxidizer, the seal gas supply valve 11a is normally closed, but when the deoxygenator is in a standby state, such as when the boiler is stopped, a standby switch is turned on to supply the seal gas. The valve 11a is configured to be opened.

In this way, the dissolved oxygen extraction gas G separated into gas and liquid in the deaeration tank 4 is supplied not only to the deaeration tank 4 but also to the water supply tank 3.
However, it functions as a seal gas, and oxygen in the atmosphere leaks into the water supply tank 3 and the deaeration tank 4, and raw water Wc in the water supply tank 3 and deaeration water in the deaeration tank 4 Although the dissolution into the Wd is prevented, the supply of the dissolved oxygen extraction gas G to the oxygen extraction gas mixing mechanism 8 is stopped when the boiler is stopped or the like.
When the dissolved oxygen extraction gas G is no longer supplied to the gas, the sealing gas supply valve 11a is opened as described above, and The gas-phase space on the water surface of the air tank 4 (and, therefore, the gas-phase space on the water surface of the water supply tank 3) is covered, and the inside of the deaeration tank 4 (and also the water supply tank 3) is covered. 3) The outside air leaks and comes into contact with the surface of the degassed water Wd (or raw water Wc) to prevent the oxygen in the leaked outside air from dissolving in the water in the tank. Although the dissolved oxygen extraction gas G supplied from the seal gas supply path 11 is supplied intermittently, even if it is supplied intermittently as described above, the sealing effect can be sufficiently achieved. For example, if the dissolved oxygen extraction gas G in the gas phase space is supplied at a somewhat higher pressure than the outside air, the atmosphere in the gas phase space can be maintained during the leakage time to the outside of the tank. Because.

One example of the case where the supply amount of the dissolved oxygen extraction gas G becomes a predetermined amount or less is the above-mentioned supply stop of the dissolved oxygen extraction gas (that is, the standby state of the deoxidizer). Not only when the supply amount of the dissolved oxygen extraction gas G into the degassing tank 4 is reduced, if there is a possibility of leakage of outside air, the dissolved oxygen extraction gas from the seal gas supply path 11 G is supplied into the deaeration tank 4. For example, the usage of the degassed water Wd at the water supply utilization point increases, the supply amount of the degassed water Wd from the water supply line 7 and the oxygen extraction gas mixing mechanism 8 from the raw water supply line 5.
The balance with the supply amount of the raw water Wc to the deaeration tank 4 is lost, and the water level in the degassing tank 4 decreases, and the pressure in the gas phase space (accordingly, the pressure in the gas phase space in the water supply tank 3) also decreases. This is also the case when the amount is below the predetermined amount, and the sealing gas supply path 1
From 1, a dissolved oxygen extraction gas G is supplied into the deaeration tank 4. The seal gas supply path 11 may be open in the deaeration tank 4 or may be open in the water supply tank 3. This is because the communication space 18 allows the two gas-phase spaces to communicate with each other. Further, the seal gas supply passage 11 may be opened below the water level in the degassing tank. The floating bubbles contribute to deoxygenation, and the dissolved oxygen extraction gas G that has floated and separated from the water surface covers the water surface and functions as a seal gas.

As described above, the advantages of the water supply deoxidizer according to the present invention can be summarized as follows: [1] Since the water supply tank 3 and the deaeration tank 4 are formed in the integral water tank 1, Manufacturing costs were reduced. In particular, the welding work distance could be shortened. [2] Since the water supply tank 3 and the deaeration tank 4 are integrally formed, a raw water supply pipe for supplying raw water Wc from the water supply tank 3 to the deaeration tank 4 via the oxygen extraction gas mixing mechanism 8 5 could be connected to both in advance, so that there was no need for the work of positioning the pipes, and the installation of the apparatus was facilitated, and at the same time, the installation construction cost was reduced. [3] Since the water supply tank 3 and the deaeration tank 4 are integrally formed, there is no need to separately provide a supply pipe for the seal gas to the water supply tank 3 outside the tank. Therefore, it is not necessary to adjust the positions of the pipes for this purpose, and the number of installation steps can be greatly reduced. [4] Since the water supply tank 3 and the deaeration tank 4 are integrally formed, it is easy to recirculate the deaerated water Wd from the deaeration tank 4 to the water supply tank 3, and furthermore, a return path is provided. Since the external pipe to be formed is not required and only the water pipe 6 is required to be provided in the partition wall 2, it is possible to recirculate the deaerated water Wd to the water supply tank 3 without increasing the equipment cost. Was. [5] Since the water supply tank 3 and the deaeration tank 4 are integrally formed, raw water Wc in the water supply tank 3 and deaeration water Wd in the deaeration tank 4 are simultaneously added for deoxygenation treatment. Can be warmed. Therefore, the heating mechanism 12 can be provided with a simple configuration without separately heating the two. [6] The gas phase space on the liquid surface of the water supply tank 3 is covered with the dissolved oxygen extraction gas G, and the raw water receiving mechanism 10 is configured to inject the raw water Wc toward the liquid surface. With the raw water Wc, the dissolved oxygen extraction gas G in the gas phase space can be entrained below the surface of the water, and the raw water Wc can be preliminarily degassed in the water supply tank 3 as well. [7] Dissolved oxygen extraction gas G in the oxygen extraction gas mixing mechanism 8
PSA to supply oxygen
Since the apparatus 9A is used, it is possible to supply nitrogen gas of which purity is adjusted within the range of 99 to 99.99% without trouble such as storage of a spare nitrogen cylinder and replacement of the nitrogen cylinder, and
In the case where the deoxygenating device for the feed water is attached to the boiler, the exhaust gas of the nitrogen PSA device 9A can be used as oxygen-enriched air for combustion. In addition, dissolved oxygen extraction gas G
If high-purity nitrogen with a purity of 99.99% or more is used, the concentration of dissolved oxygen in the degassed water Wd can be reduced to 0.05 ppm or less. It can also be used as a deoxidizer for a pure water production device that produces water. [8] Since the oxygen extraction gas mixing mechanism 8 is constituted by a static mixer, the mixing mechanism has no moving parts, the operation is stable, and there is no fear of failure.
Also, since there is no moving part, the internal pressure is stable,
Adjustment of the pressure of the raw water Wc to be mixed with the dissolved oxygen extraction gas G is also easy. [9] Since the water passage 6 for returning the deaerated water Wd to the water supply tank 3 is provided between the deaeration tank 4 and the water supply tank 3, the deaerated water Wd is mixed with the raw water Wc and repeated. Deoxygenation treatment has been performed, and the residual oxygen concentration in the degassed water Wd (dissolved oxygen concentration after deoxygenation treatment) can be maintained even lower. [10] By providing the water passage 6 for returning the deaerated water Wd to the water supply tank 3 between the deaeration tank 4 and the water supply tank 3, the excess amount of the deaerated water Wd is reduced by the deaeration tank. 4, the supply amount of the raw water Wc to the oxygen extraction gas mixing mechanism 8 needs to be changed even if the supply amount of the deaerated water Wd from the water supply line 7 fluctuates. There is no need to provide a control mechanism for the supply pump 5b for feeding the raw water Wc via the raw water supply pipe 5. In other words, the supply pump 5b only needs to be operated under the condition of the fixed amount supply. Therefore, the nitrogen PSA device 9A as the oxygen extraction gas supply device 9 can also be operated without greatly changing the nitrogen supply amount, and its operation control does not have to be complicated. [11] Heating mechanism 12 for heating raw water Wc in water supply tank 3
Because of this, the release of dissolved oxygen is promoted over the entire region in the deoxidizer, and the residual oxygen concentration in the degassed water Wd (the dissolved oxygen concentration after the deoxygenation treatment) can be further reduced. [12] Since the seal gas supply path 11 capable of supplying the dissolved oxygen extraction gas G is connected to the deaeration tank 4, even when the boiler is stopped and the deoxygenator is in a standby state, the deaeration tank 4 is not used. Further, since the inside of the gas phase space above the water surface of the water supply tank 3 can be covered with the dissolved oxygen extraction gas as a seal gas, the residual water in the deaeration tank 4 can be used as deaerated water Wd without reprocessing. It became so. The dissolved oxygen extraction gas G to be supplied as the seal gas does not need to be actively pumped, and it is sufficient to supply the dissolved oxygen extraction gas G to the extent that the outside air does not leak into the water tank 1. Further, even when the balance between the usage of the degassed water Wd and the supply of the raw water Wc to the raw water supply pipe 5 is lost, and the water level of the degassed water Wd suddenly drops, the outside water tank 1 can be used. Leakage into the inside can be prevented, and even when the demand for the degassed water Wd at the water supply utilization point fluctuates, the deoxygenation treatment can be performed without deteriorating the quality of the degassed water Wd.

[Another Embodiment] Another embodiment of the water supply deoxidizing apparatus according to the present invention, which is not shown in the above embodiment, will be described below.

<1> In the above embodiment, the example in which the raw water receiving mechanism 10 is constituted by a ball tap valve has been described. However, the raw water Wc can be received while maintaining the water level in the water supply tank 3 within a predetermined range. The raw water receiving mechanism 10 may be configured by any mechanism as long as it is a mechanism. For example,
The water supply tank 3 may be provided with a water level sensor for detecting the water level of the raw water Wc, and may be configured with an on-off valve that is opened and closed so as to maintain the detected water level within a predetermined range.

<2> In the above embodiment, an example was described in which the water supply nozzle 10a for injecting the raw water Wc to be received toward the surface of the water in the water supply tank 3 was provided at the outlet opening of the raw water receiving mechanism 10. Instead of providing the water supply nozzle 10a, the raw water Wc to be received may be simply flowed down or dropped from the outlet opening. By flowing down or dripping of the receiving raw water Wc,
This is because the dissolved oxygen extraction gas G on the water surface can be aerated by involving it under the water surface of the raw water Wc.

<3> In the above embodiment, an example was described in which the discharge end 5a of the raw water supply pipe 5 was opened below the water surface of the degassing tank 4 and near the bottom. The configuration of the unit is arbitrary, and may be configured by a spray nozzle that opens into the gas phase space above the water surface. Further, the discharge end is formed by a jet nozzle, and
It may be arranged toward the surface of the deaerated water Wd.

<4> In the above embodiment, the example in which the nitrogen PSA device 9A is provided as the oxygen extraction gas supply device 9 has been described.
May be a cylinder into which an inert gas is injected under pressure, or may be another inert gas generator, for example, a liquefied nitrogen container.

<5> In the above embodiment, an example was described in which the oxygen extraction gas mixing mechanism 8 was constituted by a static mixer. However, this is a means capable of stirring and mixing the dissolved oxygen extraction gas G with the raw water Wc. Any configuration may be used, for example, a vortex pump serving also as a supply pump 5b for supplying raw water may be used. If the dissolved oxygen extraction gas G is configured to be supplied to the suction side of the vortex pump, the raw water Wc and the dissolved oxygen extraction gas G, which are sucked therein, are stirred and mixed, and discharged as a gas-liquid two-phase flow. Because it can be.

<6> In the above embodiment, an example was described in which the pressure control valve was provided in the raw water supply line 5 downstream of the outlet of the static mixer, but the deaeration tank of the raw water supply line 5 was described. 4, an ejection nozzle is provided at the discharge end 5a,
The water pressure in the oxygen extraction gas mixing mechanism 8 may be maintained by the throttle effect.

<7> In the above embodiment, the water passage 6 disposed on the partition wall 2 is curved so as to face downward on the side of the degassing tank 4, and the water passage 6 is moved in one direction. A description has been given of an example in which a check valve 6a that opens and closes passively with a differential pressure between the upper and lower sides thereof is provided in a portion facing the vertical direction for opening and closing. May be provided to detect the difference between them and to open and close the valve actively by the control mechanism based on the difference in water level. In short, it is only necessary that the raw water Wc does not flow from the water supply tank 3 side to the deaeration tank 4 through the water passage 6. In this case, for example, when the head in the deaeration tank 4 and the head in the water supply tank 3 are detected, and the head in the deaeration tank 4 is larger than that in the water supply tank 3, What is necessary is just to comprise so that the said on-off valve may be opened.

<8> In the above embodiment, a discharge port 19 formed in the ceiling 1a of the water tank 1 at a position above the raw water receiving mechanism 10 for discharging gas in the gas phase space to the outside.
Although the example in which the reed valve 19a is provided as the check valve has been described, the position of the discharge port 19 is a preferred example, and may be formed at another position. Further, a densely formed filter may be provided at the outlet 19 instead of the check valve. In short, it is only necessary to discharge the excess gas in the gas phase space and not to suck in the outside air. Therefore, when a filter is provided at the outlet 19, the gas space may always be maintained at a positive pressure.

<9> In the above embodiment, a heating mechanism 12 capable of heating the raw water Wc in the water supply tank 3, a temperature sensor 13 for detecting the temperature of the water, and detection by the temperature sensor 13 Although the example in which the temperature control mechanism 14 for adjusting the water temperature within a predetermined temperature range is provided has been described, the heating mechanism 12 and the temperature sensor 13 are provided in the deaeration tank 4 and the inside of the deaeration tank 4 is provided. May be configured to heat the degassed water Wd. This is because the raw water Wc is only separated from the degassed water Wd by the partition wall 2, and thus the raw water Wc in the water supply tank 3 can be heated also by this configuration. The extraction of dissolved oxygen can be further promoted by heating the degassed water Wd in the degassing tank 4 after stirring and mixing the dissolved oxygen extraction gas G with the raw water Wc to extract the dissolved oxygen.

<10> In the above embodiment, although the water supply tank 3 and the deaeration tank 4 are formed integrally, the inside of the water tank 1 forming one closed space is divided into two parts in the horizontal direction. An example in which the partition wall 2 is provided, and the water supply tank 3 is formed in one space divided by the partition wall 2 and the deaeration tank 4 is formed in the other space has been described. May be divided into upper and lower parts. For example, a second water tank is formed in the space above the water tank 1 by the partition wall 2, the second water tank is used as the deaeration tank 4, and the water supply tank 3 is formed at the bottom of the water tank 1. You may. A communication space 18 between the upper edge of the partition wall 2 and the ceiling 1a is provided on the water surface of the water supply tank 3 via a space between a side portion of the partition wall 2 and a side wall of the water tank 1. It can communicate with the gas phase space.
As a specific example, a space in which the bottom and the side wall of the deaeration tank 4 are formed inside the water tank 1 by the partition wall 2, and the upper and lower sides are communicated between the formed side wall and the side wall of the water tank 1. Can also be formed. In this case, the water passage 6 may be lowered from the bottom to below the water surface of the water supply tank 3, and a controllable on-off valve may be provided in the water passage 6.
The partition wall 2 is formed of a bottomed cylinder,
It may be supported inside. Further, the water tank 1 is vertically divided by a partition wall 2, and the partition wall 2 is used as a bottom of the deaeration tank 4, and a pipe is erected on this bottom in an airtight manner. And an upper space above the water surface of the water supply tank 3 below the bottom and an upper space above the water surface of the deaeration tank 4 so as to communicate the pipe space as a communication section 18. You may comprise. The water tank 3
The vertical positional relationship between the gas and the degassing tank 4 may be reversed.

<11> In the above-described embodiment, an example has been described in which the water supply deoxidizer according to the present invention is provided in addition to the boiler 15.
It is effective not only for boiler water supply but also as a deoxygenation device provided for preventing red water in hot water pipes such as hot water for air conditioning and hot water for hot water supply, and also for deoxidizing red water in cold water supplied to cold water pipes. Also works effectively. Furthermore, since no chemical is introduced, it is also useful for high-purity water for food and drink or for cleaning, ultrapure water, etc. In particular, when high-purity nitrogen is used as the dissolved oxygen extraction gas G, 0.05
Degassed water Wd having a dissolved oxygen concentration of not more than ppm can be supplied without addition. In the case of using the deoxygenation apparatus having the configuration described in the above embodiment, this can be realized by increasing the purity of nitrogen separated by the nitrogen PSA apparatus 9A to 99.99%.

<12> In addition to the above <11>, for example, when used for preventing red water in hot water piping, the deaerated water Wd
It is necessary that the concentration of residual oxygen in the water is 0.5 ppm or less. For example, when the temperature of the raw water Wc is maintained at 50 to 90 ° C., the oxygen extraction gas mixing device 8 with respect to the supply amount of the raw water Wc The extraction gas supply rate defined as the volume ratio of the supply amount (standard state) of the dissolved oxygen extraction gas G to be supplied is set to 0.01 to 0.2, and the temperature of the raw water Wc is 30 ° C. or more and less than 50 ° C. If the temperature is maintained within the temperature range described above, the extraction gas supply rate may be set within the range of 0.25 to 0.5. Under this condition, the concentration of residual oxygen in the degassed water Wd can be maintained at 0.5 ppm or less, so that generation of red water in the hot water pipe can be prevented.

On the other hand, when used for preventing red water in the cold water pipe, the residual oxygen concentration in the deaerated water Wd is 1.0 pp.
m, for example, the temperature detected by the temperature sensor 13 is 0 without providing the heating mechanism 12 described above.
When the temperature is in the range of ~ 30 ° C, the extraction gas supply rate may be set in the range of 0.5 to 1.0 according to the detected temperature. Under these conditions, the concentration of residual oxygen in the degassed water Wd can be maintained at 1.0 ppm or less, so that generation of red water in the cold water pipe can be prevented.

[0054]

As described above, according to the present invention,
With a device that is easy to install and handle with small and simple equipment, and can reduce not only the initial cost but also the running cost, deoxygenated water with a low oxygen concentration could be supplied.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing an example of a deoxidizer according to the present invention.

FIG. 2 is a configuration explanatory view showing an application example of the deoxidizer according to the present invention.

FIG. 3 is a configuration explanatory view illustrating a conventional oxygen scavenger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water tank 1a Ceiling 2 Partition wall 3 Water supply tank 4 Deaeration tank 5 Raw water supply line 6 Water supply line 7 Water supply line 8 Oxygen extraction gas mixing mechanism 9 Oxygen extraction gas supply apparatus 9A Nitrogen PSA apparatus 9a Exhaust path 10 Raw water reception mechanism DESCRIPTION OF SYMBOLS 11 Seal gas supply path 12 Heating mechanism 13 Temperature sensor 14 Temperature control mechanism 15 Boiler 16 Boiler water supply pipe 17 Combustion air supply path 18 Communication space G Dissolved oxygen extraction gas Wc Raw water Wd Deaerated water

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Mori 600-1, Kuzedenjo-cho, Minami-ku, Kyoto, Kyoto Prefecture Inside Takuma Kyoto Plant (72) Inventor Toshihiko Tanaka 600, Kusedenjo-cho, Minami-ku, Kyoto, Kyoto No. 1 Inside the Takuma Kyoto Factory (72) Inventor Koichi Ogawa 1-14-14 Shibata, Kita-ku, Osaka City, Osaka Prefecture Kuraray Chemical Co., Ltd. (72) Inventor Kazuki Takano Okayama, Okayama 73, Sanyo Denshi Kogyo Co., Ltd. (72) Inventor Yukito Ota 4342 Tsuruumi, Bizen-shi, Okayama Kuraray Chemical Co., Ltd. F-term (reference) 4D011 AA15 AD03 4D037 AA08 AB11 BA23 BB01 BB02 BB05 BB06

Claims (6)

[Claims] A water supply tank provided with a raw water receiving mechanism for receiving raw water while maintaining a water level within a predetermined range; and a raw water supply pipe connected to the water supply tank through a raw water supply pipe for supplying raw water received in the water tank. A deaeration tank connected to a water supply pipe that supplies deaerated water after the deoxygenation treatment to a water supply utilization point, and to the raw water supply pipe, supply dissolved oxygen extraction gas to the raw water. An oxygen extraction gas mixing mechanism for mixing, wherein the raw water mixed with the dissolved oxygen extraction gas is gas-liquid separated in the degassing tank to reduce dissolved oxygen in the raw water; Providing a partition wall that divides the inside of the water tank that forms the space into two, forming the water supply tank in one space divided by the partition wall, and forming the deaeration tank in the other space, Space between the partition wall and the ceiling of the aquarium, Water deoxygenation device that is formed in the communicating space which communicates the gas phase space and upward vapor space formed is formed above the supply water tank air tank. 2. The deoxygenating device for feed water according to claim 1, wherein the raw water receiving mechanism is configured to jet raw water to be received toward a water surface in the water supply tank. 3. The supply of the dissolved oxygen extraction gas to the oxygen extraction gas mixing mechanism is less than a predetermined amount by connecting a seal gas supply path capable of supplying the dissolved oxygen extraction gas to the degassing tank. 3. The system according to claim 1, wherein the dissolved oxygen extraction gas is supplied from the seal gas supply passage at times.
A deoxygenation device for water supply according to item 1. 4. A water supply tank having a raw water receiving mechanism for receiving raw water while maintaining a water level within a predetermined range, and a raw water supply pipe for supplying the raw water received in the water tank, wherein the raw water is connected to the water tank. A deaeration tank connected to a water supply pipe that supplies deaerated water after the deoxygenation treatment to a water supply utilization point, and to the raw water supply pipe, supply dissolved oxygen extraction gas to the raw water. An oxygen extraction gas mixing mechanism for mixing, wherein the raw water mixed with the dissolved oxygen extraction gas is gas-liquid separated in the degassing tank to reduce dissolved oxygen in the raw water; Providing a partition wall that divides the inside of the water tank that forms the space into two, forming the water supply tank in one space divided by the partition wall, and forming the deaeration tank in the other space, On the partition wall, both the deaeration tank and the water supply tank The position of the lower position, said degassed water deaeration tank in one direction toward the supply water tank, deoxygenation apparatus feedwater is provided with a water pipe passage flowing under a predetermined condition. 5. An oxygen extraction gas supply device, which is provided alongside a boiler, wherein the water supply line is provided as a boiler water supply line, and an oxygen extraction gas supply device for supplying a dissolved oxygen extraction gas to the oxygen extraction gas mixing mechanism is provided. A nitrogen PSA device that separates and supplies nitrogen in the air by a separation method and connects an exhaust path of the nitrogen PSA apparatus that discharges exhaust gas after separating nitrogen to a combustion air supply path to the boiler. The deoxygenation device for water supply according to any one of claims 1 to 4, wherein 6. A heating mechanism capable of heating the raw water is provided in the water supply tank, and a temperature sensor for detecting the water temperature is provided. The water temperature detected by the temperature sensor is set to 30 in the heating mechanism. The deoxygenation device for feed water according to any one of claims 1 to 5, further comprising a temperature control mechanism capable of adjusting the temperature within a temperature range of -90 ° C.