JP4843330B2 - Oxygen absorber - Google Patents

Description

The present invention relates to a deoxygenation apparatus that includes a degassing treatment tank in a degassing treatment tower and mixes an inert gas with water to be treated in the degassing treatment tank to reduce dissolved oxygen.

  Conventionally, as this type of deoxygenation apparatus, an inert gas (for example, nitrogen gas) is treated with a mixing device such as an ejector nozzle, a static mixer, a diffuser plate, or the like. Some were configured to contact water. As shown in FIG. 3, the deoxygenating apparatus includes a vertically long degassing treatment tank 20, and the inert gas 4 is bubbled by the mixing device 21, so that the inert gas 4 is treated. It was replaced by dissolved oxygen while rising in the water 3, and the action of reducing dissolved oxygen in the water to be treated was used. One mixing device 21 was provided for one degassing treatment tank 20. (For example, refer to Patent Document 1 and Patent Document 2).

JP 2001-347102 A JP 2004-267924 A

According to the conventional deoxygenation apparatus described above, in order to improve the deaeration efficiency by bubbling, it is necessary to contact the inert gas and the water to be treated for a longer time, and the height of the deaeration treatment tank is increased. The dimensions were set to be large so that the inert gas could rise in the vertically elongated deaeration treatment tank.
Therefore, in order to deoxygenate a large amount of water to be treated, it is necessary to prepare a large number of deoxygenation devices, and accordingly, each deoxygenation device requires the above-described mixing device, which increases equipment costs. There is a problem in that it is necessary to connect each deoxygenation device by piping, which requires installation effort and installation cost.

  Accordingly, an object of the present invention is to provide a deoxygenation apparatus that can solve the above-mentioned problems and achieve deoxygenation treatment of a large amount of water to be treated while suppressing facility costs and installation costs.

A first characteristic configuration of the present invention is a deoxygenation apparatus that includes a degassing treatment tank in a degassing treatment tower and mixes an inert gas with water to be treated in the degassing treatment tank to reduce dissolved oxygen. In the above, the water supply pipe for supplying the treatment target water to the degassing treatment tank is provided in a horizontal arrangement,
A plurality of spray nozzles that supply the treatment target water supplied from the water supply pipe to the degassing treatment tank in a sprayed state are arranged in parallel in the longitudinal direction of the water supply pipe,
Below the spray nozzles, arrange the degassing treatment tanks along the juxtaposed direction of the spray nozzles,
The drainage part of the water to be treated is provided at one end part in the juxtaposed direction of the spray nozzles in the degassing treatment tank,
A gas supply part for supplying the inert gas to the degassing treatment tank is provided on one end side in the juxtaposition direction of the injection nozzles in the degassing treatment tank,
The exhaust part of the inert gas is provided at the other end side in the juxtaposition direction of the injection nozzles in the degassing treatment tank.

According to the first characteristic configuration of the present invention, the deaeration treatment tank is formed in a horizontally long shape, and a plurality of spray nozzles that supply the treatment target water to the deaeration treatment tank in a sprayed state are provided in the deaeration treatment. A gas supply unit that is arranged in parallel along the longitudinal direction of the tank, the drainage part of the water to be treated is provided at one end of the degassing tank, and the inert gas is supplied to the degassing tank. In addition, since the exhaust part of the inert gas is provided separately at both ends of the deaeration treatment tank, it is injected from the injection nozzle without forming a deoxygenation device having a large height as in the prior art. As the water to be treated falls, the inert gas in the space of the degassing tank is drawn into the water to be treated, and the deoxygenation of the water to be treated is performed with the same or higher efficiency as before. Is possible. And since such a process is repeatedly performed over the full length of a horizontally long deaeration tank, an extremely efficient deoxygenation process can be achieved.
In addition, by simply increasing the volume of the degassing tank, it becomes possible to accommodate a large amount of water to be treated for the deoxygenation treatment. It is possible to reduce the installation cost of the deoxygenation device without requiring time and effort for connecting with piping.
Furthermore, compared to using a large number of conventional expensive mixing devices, according to the product of the present invention, only the injection nozzle that can adopt a simple structure is provided. It is possible to suppress.
In addition, the water to be treated flowing down toward the one end of the horizontally long degassing treatment tank is continuously degassed from the upstream side, and the amount of dissolved oxygen decreases as it approaches the downstream side. In order to further deaerate oxygen from the water to be treated which has a tendency to be dissolved and the amount of dissolved oxygen is reduced, it is effective to contact an inert gas with higher purity. Further, on the upstream side, the amount of dissolved oxygen is larger than that on the downstream side, so that it is possible to efficiently deoxygenate even with an inert gas having a low purity.
In this sense, as in the present invention, the gas supply unit is arranged at one end of the degassing treatment tank, and the exhaust unit is arranged at the other end so that the inert gas from one end to the other end is disposed. Can make a flow. Therefore, on the downstream side of the water stream to be treated, an inert gas having a high purity that is almost not mixed with deaerated oxygen is distributed immediately after being supplied, and the amount of deaerated oxygen mixed in increases toward the upstream side. The purity of the gas decreases. As a result, it is possible to achieve efficient deoxygenation treatment as a whole, both upstream and downstream in the water stream to be treated.

  The 2nd characteristic structure of this invention exists in the place which has set larger the installation space | interval of the said injection nozzle, the location close | similar to the said drainage part.

  According to the second characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effects of the first characteristic configuration of the present invention, the second characteristic configuration is provided at each position along the longitudinal direction of the deaeration treatment tank. While the treatment target water is ejected from each of the spray nozzles, the treatment target water is drained from the drainage part provided at one end of the degassing treatment tank. A lot of water to be treated is collected from the upstream side, and the amount of water is larger than that of the upstream side. Accordingly, the flow velocity also tends to increase, and the speed at which the injection region where the processing target water is injected from the specific injection nozzle and falls with the inert gas onto the water surface of the processing target water moves to the upstream side. The downstream side is faster. However, if the injection regions of the adjacent injection nozzles are too interfered with each other, there is a risk of preventing the deaeration of oxygen deaerated due to the mixing of the inert gas, resulting in a decrease in the deaeration efficiency. It can be. Therefore, as in the present invention, the installation interval of the injection nozzles is set to be larger toward the downstream side, so that interference between adjacent nozzles at a location where the flow velocity becomes faster is less likely to occur, and efficient removal is also possible on the downstream side. Qi can be realized.

  The 3rd characteristic structure of this invention exists in the place which has set the nozzle diameter of the said injection nozzle so that the location near the said waste_water | drain part is small.

  According to the third characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effects according to the first or second characteristic configuration of the present invention, each position along the longitudinal direction of the deaeration treatment tank is provided. While the water to be treated is sprayed from each of the provided spray nozzles, the water to be treated is drained from the drainage part provided at one end of the degassing treatment tank, so the location close to the drainage part (downstream side) In this case, a large amount of water to be treated is collected from the upstream side, and the amount of water is larger than that of the upstream side. Accordingly, the flow velocity also tends to increase, and the speed at which the injection region where the processing target water is injected from the specific injection nozzle and falls with the inert gas onto the water surface of the processing target water moves to the upstream side. The downstream side is faster. However, if the injection regions of the adjacent injection nozzles are too interfered with each other, there is a risk of preventing the deaeration of oxygen deaerated due to the mixing of the inert gas, resulting in a decrease in the deaeration efficiency. It can be. Therefore, as in the present invention, the nozzle diameter of the injection nozzle is set to be smaller toward the downstream side, so that interference between adjacent nozzles at a location where the flow velocity becomes faster is less likely to occur, and efficient removal is also possible on the downstream side. Qi can be realized.

  According to a fourth characteristic configuration of the present invention, the spray nozzle is a spray nozzle.

  According to the fourth characteristic configuration of the present invention, in addition to being able to achieve the above-described operation effect by any one of the first to third characteristic configurations of the present invention, it is possible to configure the injection nozzle at a very low cost. It becomes possible, and it becomes possible to aim at the cost reduction as the whole deoxygenation apparatus.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

  FIG. 1 shows an embodiment of the deoxygenation device of the present invention (hereinafter simply referred to as deoxygenation device D). For example, deoxygenation of water sent to a demand process such as hot water supply, water supply, and boiler is performed. It is configured to be able to.

The deoxygenation device D includes a plurality of degassing treatment tanks 2 in one degassing treatment tower 1.
Here, a deoxygenation apparatus D in which two degassing treatment tanks 2 are arranged up and down will be described as an example.

The deoxygenation device D is configured so that dissolved oxygen can be reduced by mixing nitrogen gas (an example of an inert gas) 4 with the water 3 to be treated in the degassing treatment tank 2.
In the degassing tower 1, a first degassing tank 2A, a second degassing tank 2B, and a water tank 2C are formed so as to overlap from top to bottom. The first degassing treatment tank 2A, the second degassing treatment tank 2B, and the water storage tank 2C are each formed in a horizontally long shape, and the treatment target water 3 that overflows one end of the first degassing treatment tank 2A Then, the water to be treated 3 that has flowed down to the other end of the second degassing treatment tank 2 and overflowed one end of the second degassing treatment tank 2 flows down to the other end of the water storage tank 2C, and into the water storage tank 2C. It is configured to discharge the accumulated treated water to a demand process outside the figure.
That is, H in the figure represents drainage portions H1 and H2 in the respective treatment tanks 2A and 2B, and H3 represents a drainage portion of the deoxidizer D.

  Further, above both treatment tanks 2A and 2B, a water supply pipe 6 is provided along the longitudinal direction thereof, and a plurality of spray nozzles (spray nozzles) formed at intervals in the longitudinal direction of the water supply pipe 6 are provided. An example) It is comprised so that the process target water 3 can be injected with respect to each process tank 2A, 2B from 6a. In other words, a raw water supply system is connected to the water supply pipe 6 in communication.

On the other hand, a second gas supply unit 7b capable of supplying nitrogen gas 4 produced by a nitrogen gas generator (not shown) to the second degassing treatment tank 2B is provided in the vicinity of the drainage part H2 of the second degassing treatment tank 2B. It is. In the vicinity of the drainage part H1 of the first degassing treatment tank 2A, a first gas supply part 7a that can supply the nitrogen gas 4 from the second degassing treatment tank 2B to the first degassing treatment tank 2A is provided. . The first and second gas supply units 7a and 7b are collectively referred to as a gas supply unit 7.
Further, near the other end of the second degassing treatment tank 2B, the nitrogen gas 4 supplied from the second gas supply unit 7b to the second degassing treatment tank 2B and passing through the treatment tank 2B is first degassed. While the second exhaust part 8b for exhausting to the treatment tank 2A is provided, the first gas supply part 7a supplies the first deaeration treatment tank 2A near the other end of the first deaeration treatment tank 2A. The first exhaust part 8a for exhausting the nitrogen gas 4 having passed through the treatment tank 2A to the outside of the apparatus is provided. The first and second exhaust parts 8a and 8b are collectively referred to as an exhaust part 8.

  Although not shown in the figure, a gas adjusting means for adjusting the supply amount of the nitrogen gas 4 supplied from the gas supply unit 7, the exhaust amount of the nitrogen gas 4 exhausted from the exhaust unit 8, and the water supply pipe 6, a water adjusting unit that adjusts the supply amount of the processing target water 3 supplied from 6, a drainage amount of the processing water drained from the drainage part H 3, a temperature measuring unit that measures the temperature of the processing target water 3, and the processing A flow rate measuring means for measuring the flow rate of the target water 3 and the nitrogen gas 4, a water level measuring means for measuring the water level in each of the deaeration treatment tanks 2A and 2B, a control mechanism for centrally controlling these means, and the like are provided. It has been.

  Further, the spray nozzle 6a is set so that the interval between the spray nozzles 6a is larger as it is closer to the drainage portions H1 and H2, that is, as the downstream side in the flow direction of the water to be treated is larger.

The deoxygenation procedure of the water to be treated using the deoxygenation apparatus D will be described.
The processing target water 3 is sent from the water supply pipe 6 to the deoxygenation device D, and nitrogen gas is sent from the second gas supply unit 7b to the deoxygenation device.
The treatment target water 3 is sprayed from each spray nozzle 6a, passes through the first degassing treatment tank 2A and the second degassing treatment tank 2B, overflows and flows down to the water storage tank 2C, and is then drained from the drainage part H3. The The nitrogen gas comes into contact with the water to be treated 3 sprayed from the spray nozzle 6a and mixes into the water to be treated in each of the deaeration tanks 2A and 2B, and a part of the nitrogen gas is replaced with dissolved oxygen while floating. Then, the nitrogen gas 4 that floats in the air and the degassed oxygen flow upward in the degassing treatment tank, and are discharged out of the apparatus from the first exhaust part 8a.
In such a contact process between the water to be treated and nitrogen gas, dissolved oxygen in the water to be treated is removed.

According to the deoxygenation device of the present embodiment, deoxygenation treatment is repeatedly performed over the entire length of the horizontally long degassing treatment tank, and extremely efficient deoxygenation treatment can be achieved, and the device itself has a very simple configuration. Therefore, it is possible to reduce the installation cost of the deoxygenation device and the cost of the deoxygenation device itself.
Furthermore, by adopting a spray nozzle arrangement that matches the flow of the water to be treated (the flow velocity increases toward the downstream side), it is possible to achieve efficient deaeration on both the upstream and downstream sides. Become.
[Another embodiment]
Other embodiments will be described below.

<1> The deoxygenation device is not limited to the one provided with the upper and lower two-layer type deaeration treatment tanks described in the previous embodiment. For example, a single-layer type or a three-layer or more deaeration treatment tank It may be provided.
In addition, as shown in FIG. 2, the deoxygenation apparatus can employ a configuration in which the deoxygenation apparatus is connected in series, and the deoxygenation efficiency can be further improved.
Further, the shape of the deaeration tower and each deaeration tank is not limited to that described in the previous embodiment, and can be changed as appropriate. You may comprise using.
<2> The spray nozzle is not limited to the spray nozzle described in the previous embodiment. For example, an ejector nozzle may be used, and these are collectively referred to as a spray nozzle.
<3> The installation interval of the injection nozzles is not limited to the one set closer to the drainage portion as described in the previous embodiment. For example, as shown in FIG. It may be.
<4> The nozzle diameter of the injection nozzle may be set smaller as the position closer to the drainage portion as shown in FIG. 2, for example. In this case, the flow speed of the water to be treated becomes faster toward the downstream side. On the other hand, it becomes easy to prevent interference between the injection regions of adjacent nozzles, and the deoxygenation process can be executed more efficiently. Of course, in such a case, the installation interval of the injection nozzles may be equally spaced apart from being set larger as the location closer to the drainage portion.
<5> The flow-down direction of the water to be treated and the flow-down direction of the nitrogen gas are not limited to those set to face each other as described in the previous embodiment, and are set in the same direction, for example. May be.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

Conceptual diagram showing a deoxygenation device The conceptual diagram which shows the deoxygenation apparatus of another embodiment Conceptual diagram showing a conventional deoxygenation device

Explanation of symbols

2 Degassing treatment tank 3 Water to be treated 4 Nitrogen gas (an example of inert gas)
6a Spray nozzle (an example of spray nozzle)
7 Gas supply part 8 Exhaust part H Drainage part

Claims (4)

A deoxygenation apparatus comprising a degassing treatment tank in a degassing treatment tower, and reducing dissolved oxygen by mixing an inert gas with water to be treated in the degassing treatment tank ,
While providing a water supply pipe for supplying the treatment target water to the degassing treatment tank in a horizontal arrangement,
A plurality of spray nozzles that supply the treatment target water supplied from the water supply pipe to the degassing treatment tank in a sprayed state are arranged in parallel in the longitudinal direction of the water supply pipe,
Below the spray nozzles, arrange the degassing treatment tanks along the juxtaposed direction of the spray nozzles,
The drainage part of the water to be treated is provided at one end part in the juxtaposed direction of the spray nozzles in the degassing treatment tank,
A gas supply part for supplying the inert gas to the degassing treatment tank is provided on one end side in the juxtaposition direction of the injection nozzles in the degassing treatment tank,
The deoxygenation apparatus which provided the exhaust part of the inert gas in the other end side in the juxtaposition direction of the said injection nozzle in the said deaeration processing tank.   The deoxygenation apparatus according to claim 1, wherein an installation interval of the injection nozzles is set to be larger as a position is closer to the drainage part.   The deoxygenation apparatus according to claim 1 or 2, wherein a nozzle diameter of the injection nozzle is set to be smaller as a position is closer to the drainage part.   The deoxygenation device according to any one of claims 1 to 3, wherein the spray nozzle is configured by a spray nozzle.

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