JP4242751B2 - Deaerator for water supply - Google Patents

Description

  The present invention relates to a water supply deaeration device that generates dissolved water by removing dissolved oxygen from water to be treated by vacuum suction of the water to be treated supplied to a degassing tank.

  In general, in water supply facilities and hot water facilities installed in hotels and condominiums, dissolved oxygen in tap water causes rust to form inside hot water supply equipment such as boilers and water pipes. It may cause a decrease in the service life of the equipment. In particular, steam boiler equipment used in the field of food production and the like is likely to have holes due to corrosion, and repair and parts replacement are often required after several years of use.

  For this reason, the deaeration apparatus which removes the dissolved oxygen in the tap water (to-be-processed water) supplied to water supply equipment and hot water supply equipment conventionally is proposed. As this type of deaerator, depending on the deaeration principle, a vacuum deaeration method using a hollow fiber gas permeable membrane module or a deaeration tower, a heating deaeration method for deaeration by heating using a steam heat source, etc. Various types of are known.

In particular, as a degassing apparatus using a vacuum degassing system, a vacuum degassing apparatus disclosed in JP-A-10-151442 is known. This deaeration device forms a packed bed of gas-liquid contact material in an airtight deaeration tower, supplies treated water from above the deaeration tower, and discharges treated water from below the packed bed In addition, in the vacuum deaeration apparatus in which the gas in the deaeration tower is discharged by the vacuum means, the opening ratio of the support member that supports the gas-liquid contact material from below is set to 35% or more. Thereby, formation of a water film of treated water falling from the support member is prevented, and even if a space is formed below the packed bed support member, re-dissolution of oxygen here is suppressed.
JP-A-10-151442

  However, the conventional deaeration device described above has the following problems.

  First, since the basic deaeration action depends on the jet of treated water and vacuum suction, a sufficient deaeration effect cannot be obtained.

  Secondly, complex components are required in the main part and the number of parts increases, leading to a decrease in productivity due to an increase in manufacturing man-hours and an increase in costs associated with parts and manufacturing.

  Third, because the amount of treatment per unit time is limited, hotels and condominiums that require a large amount of water supply require multiple deaerators according to the water supply demand, which imposes significant equipment costs. .

  The object of the present invention is to provide a deaeration device for water supply that solves the problems existing in the background art.

  In order to solve the above-described problem, the present invention generates the treated water Ws by removing the dissolved oxygen from the treated water Wo by vacuum suctioning the treated water Wo supplied to the deaeration tank 2. When the deaeration device 1 for water supply is configured, a deaeration tank 2 formed in a horizontally long cylindrical shape, and arranged in the horizontal direction in the deaeration tank 2, and a bottom surface 23 and the bottom surface 23 A plurality of deaeration treatment trays 3 that can store a predetermined amount of water to be treated Wo by having side portions 24 raised from the peripheral edge of each, and a position at a predetermined distance Hs with respect to each deaeration treatment tray 3. And a plurality of spray nozzles 4 that generate bubbles B by spraying and colliding shower-like water to be treated Wo against the surface of the water to be treated Wo collected in the deaeration treatment dish 3. , Between the spray nozzles 4 in the deaeration tank 2 Are connected to the plurality of vacuum suction ports 6 for performing vacuum suction to the inside of the deaeration tank 2 and the plurality of spray nozzles 4. An open / close valve 5 that can be used, a water tank 7 that is disposed below the deaeration tank 2 and is connected to the deaeration tank 2 by a water pipe 8. When the water level Lw of the water storage tank 9 connected to the water tank 7 reaches the upper limit level Lu, the water is transferred from the water storage tank 7 to the water storage tank 9, and when the water level Lw of the water storage tank 7 reaches the lower limit level Ld When the water supply from the water storage tank 7 to the water storage tank 9 is stopped and the water level Ltw of the water storage tank 9 reaches the upper limit level Ltu, the deaeration process for the water to be treated Wo is stopped, and the water level Ltw of the water storage tank 9 is lower than the lower limit. If the level is reached A part of the treated water Ws discharged from the sequence controller 10 that performs the deaeration process on the treated water Wo and the water pump 11 that feeds water from the water tank 7 to the water tank 9 is returned to the inside of the degas tank 2 or the water tank 7. And a return circuit 12.

  According to the water supply deaeration device 1 according to the present invention having such a configuration, the following remarkable effects can be obtained.

  (1) Since a large amount of bubbles B are generated by spraying shower-like water to be treated Wo on the water to be treated Wo collected in the deaeration treatment dish 3. The effect can be dramatically increased.

  (2) Since a plurality of vacuum suction ports 6 for performing vacuum suction with respect to the inside of the deaeration tank 2 by being provided between the respective injection nozzles 4 in the deaeration tank 2, a plurality of injection nozzles 4. Even if it is a case, uniform vacuum suction in the deaeration tank 2 can be performed.

  (3) Since each of the plurality of spray nozzles 4 is connected to each of the plurality of spray nozzles 4 to provide an open / close valve 5 that can be used by selecting one or more of the spray nozzles 4. The processing capacity can be easily changed (increased or decreased) in response to

  (4) Since the main part can be composed of the injection nozzles 4 ... and the deaeration treatment tray 3 ..., simplification of the component parts and reduction of the number of parts can be realized. Can contribute to cost reduction.

  (5) In addition to ensuring a large amount of treatment per unit time, the amount of treatment can be easily changed, so it can be flexibly adapted to various uses and various water supply conditions, is highly versatile, and has a water storage tank. In this case, the water storage tank can be reduced in size, and further, the deterioration of the treated water Ws in the water storage tank can be prevented.

  (6) Since a return circuit 12 is provided for returning a part of the treated water Ws discharged from the water pump 11 for feeding water from the water tank 7 to the water tank 9 to the inside of the deaeration tank 2 or the water tank 7, water is stored from the water tank 7. Water can be smoothly supplied to the tank 9.

  Next, preferred embodiments according to the present invention will be given and described in detail with reference to the drawings.

  First, the structure of the deaeration device 1 for water supply which concerns on a present Example is demonstrated with reference to FIGS.

  In the water supply deaeration apparatus 1 shown in FIG. 1, reference numeral 2 denotes a deaeration tank. The deaeration tank 2 has a sealed structure as a whole, and is formed in a cylindrical shape that is long in the horizontal direction by a rigid material. A plurality of leg portions 21 are fixed to the inner lower surface of the deaeration tank 2 at predetermined intervals, and a processing dish support portion 22 formed in a channel shape is fixed on the leg portions 21. Further, a plurality (nine in the embodiment) of deaeration treatment dishes 3... Made of a rigid material are arranged on the treatment dish support portion 22 in a horizontal direction and fixed. One deaeration treatment dish 3 (the same applies to the other deaeration treatment dishes 3...), As shown in FIGS. 2 and 3, has a ring-shaped bottom surface portion 23 and a ring shape raised from the periphery of the bottom surface portion 23. It has a side part 24. In addition, although the bottom face part 23 of the Example showed the example which curved the center side below, it may be flat.

  On the other hand, a plurality of injection nozzles 4 corresponding to the deaeration treatment dishes 3 are arranged above the deaeration treatment dishes 3, that is, on the upper surface of the deaeration tank 2. One injection nozzle 4 (the same applies to the other injection nozzles 4...) Is provided with a branch pipe 25 penetrating from the outside to the top surface of the deaeration tank 2, and the branch pipe 25 facing the inside of the deaeration tank 2. Attach the injection nozzle 4 to the tip (lower end). In this case, the injection nozzle 4 is disposed immediately above the center of the bottom surface portion 23 of the deaeration treatment dish 3 and is separated from the center by a predetermined distance Hs. The spray nozzle 4 has a function of spraying the supplied water to be treated Wo in a shower shape. The injection nozzle 4 may be of a type in which an internal natural flow is directly injected from the injection port 4o, or a type in which a spiral water flow is generated inside and this spiral water flow is injected from the injection port 4o. Good. Furthermore, the type which can adjust injection states, such as an injection angle and an injection quantity, as needed may be sufficient.

  A water storage tank 7 is disposed below the deaeration tank 2. The water storage tank 7 has a sealed structure as a whole, and is formed in a cylindrical shape that is long in the horizontal direction by a rigid material. And the upper surface part of this water storage tank 7 and the lower surface part of the deaeration tank 2 are connected by a plurality (two in the embodiment) of water pipes 8 arranged at different positions. The water pipes 8 of the embodiment also serve as a support function for the deaeration tank 2. In addition, although the deaeration tank 2 and the water storage tank 7 can also be integrally formed by a single tank, by separating the deaeration tank 2 and the water storage tank 7, a plurality of deaeration treatment dishes in the deaeration tank 2 Assembling and design flexibility can be enhanced, such as easy assembly of 3..., And can contribute to downsizing. From the upper side to the lower side, a full water detector 26f, an upper limit level detector 26u, a lower limit level detector 26d, a drought detector 26e, and a grounding device 26g are provided at predetermined intervals on the side surface (end surface or peripheral surface) of the water storage tank 7. Attached sequentially to the place. Thereby, the upper limit level detector 26u can detect that the water level Lw of the treated water Ws stored in the water tank 7 has reached the upper limit level Lu, and the lower limit level detector 26d allows the water level Lw to reach the lower limit level Ld. You can detect that it has been reached. Further, the full water detector 26f and the drought detector 26e can detect a full water condition and a drought condition, respectively.

  On the other hand, the branch pipes 25 leading to the outside of the deaeration tank 2 are connected to the main pipe 27 via open / close valves (solenoid valves) 5. The main pipe 27 is supplied via the water supply valve 29. Connect to a water source (waterworks, etc.) 28. By providing the opening / closing valve 5 ..., one or more of the plurality of injection nozzles 4 ... can be selected and used. As a result, the processing capacity can be easily changed according to the amount of water related to various uses and various water supply states ( Increase or decrease).

  Further, vacuum suction ports 6 for performing vacuum suction with respect to the inside of the deaeration tank 2 are provided between a plurality of positions on the upper surface portion of the deaeration tank 2, preferably between the spray nozzles 4. By providing the vacuum suction ports 6 dispersed at a plurality of positions, uniform vacuum suction in the deaeration tank 2 can be performed even when a plurality of injection nozzles 4 are arranged. Each vacuum suction port 6 is connected to a vacuum pump 31 through a vacuum line 30. Further, a vacuum pressure detector 32 for detecting the vacuum pressure is connected in the middle of the vacuum line 30.

  On the other hand, one end of the water supply line 33 is connected to the lower surface portion of the water storage tank 7, and the other side of the water supply line 33 is connected to a separate water storage tank 9 via the water supply pump 11 and the check valve 37. The water supply line 33 is provided with a return circuit 12 that returns a part of the treated water Ws discharged from the water supply pump 11 to the inside of the deaeration tank 2 (or the water storage tank 7). The return circuit 12 includes a water supply line 33 on the discharge side of the water supply pump 11 and a return pipe 34 that connects the inside of the deaeration tank 2, and an open / close valve 35 that is connected in the middle of the return pipe 34. In this case, the flow rate of water returned by the return circuit 12 is set by the opening degree of the opening / closing valve 35 or the diameter of the return pipe 34 so as to be about 1/10 of the flow rate of water supplied to the water storage tank 9.

  The water storage tank 9 has a function of temporarily storing the treated water Ws from which dissolved oxygen has been removed by the deaeration tank 2. Therefore, although not shown, the water storage tank 9 is provided with a drain port (equipment line) for supplying the treated water Ws to a water supply facility, a hot water supply facility, or the like. The water storage tank 9 is additionally provided with an upper limit level detector 36u, a lower limit level detector 36d, and a grounding device 36g. In this case, the level detectors 36u and 36d and the grounding device 36g are attached to the top surface portion of the water storage tank 9 at predetermined intervals. Accordingly, the upper limit level detector 36u can detect that the water level Ltw of the treated water Ws stored in the water storage tank 9 has reached the upper limit level Ltu, and the lower limit level detector 36d allows the same water level Ltw to reach the lower limit level Ltd. You can detect that it has been reached.

  Further, reference numeral 10 denotes a sequence control unit, which has a function of automatically controlling (sequence control) the water supply deaeration device 1. Therefore, the input port of the sequence control unit 10 includes the vacuum pressure detector 32, the full water detector 26f, the upper limit level detector 26u, the lower limit level detector 26d, the drought detector 26e, the grounding device 26g, and the upper limit level detection. 36u, lower limit level detector 36d and grounding device 36g are connected to each other, and the above-mentioned opening / closing valve 5 ..., water supply valve 29, opening / closing valve 35, vacuum pump 31 and water pump 11 are connected to the output port of the sequence controller 10. Connect each.

  In FIG. 4, the external appearance structure of the deaeration device 1 for water supply is shown. In FIG. 4, the same parts as those in FIG. In FIG. 4, reference numeral 41 denotes a base on which components and the like are installed on the upper surface, 42... Support legs for supporting the water storage tank 7, 43 a top cover, and 44 a control box. The control box 44 incorporates the above-described sequence control unit 10, and the front panel has various alarm lamps 45 that are turned on when the above-described full-water detector 26f and drought detector 26e detect full or drought. And various operation switches 46 such as operation switches.

  Next, operation | movement of the deaeration device 1 for water supply which concerns on a present Example is demonstrated according to the flowchart shown in FIG. 6, referring FIGS. 1-4.

  Now, it is assumed that the water tank 7 and the water tank 9 are both empty. Also, it is assumed that all the injection nozzles 4 are used and all the open / close valves 5 are controlled to be opened. In this state, the water supply valve 29 is closed, the open / close valve 35 is closed, and the water supply pump 11 is turned off (the water supply line 33 is closed).

  To start operation, an operation switch provided in the control box 44 is turned on. Accordingly, the vacuum pump 31 is activated (turned on), and vacuum suction is performed on the inside of the deaeration tank 2 (step S1). The vacuum pressure in the deaeration tank 2 is detected by the vacuum pressure detector 32, and the detection result is given to the sequence controller 10. The sequence control unit 10 monitors the vacuum pressure, and when it reaches a preset set value (-95 [kPa] in the embodiment), it switches the water supply valve 29 to open (step S1).

  Thereby, the to-be-treated water (tap water) Wo is supplied from the water supply source 28 to each of the injection nozzles 4... And the shower-like to-be-treated water Wo is ejected vigorously from the injection ports 4 o of each of the injection nozzles 4. Step S2). The sprayed water to be treated Wo is sprayed uniformly on the bottom surface portions 23 of the deaeration treatment dishes 3 separated by a predetermined distance Hs (step S3). In this case, as shown in FIG. 2, since a predetermined amount of water to be treated Wo accumulates in the deaeration treatment dishes 3..., A shower-like shape is formed on the surface of the water to be treated Wo collected in the deaeration treatment dishes 3. The to-be-processed water Wo collides vigorously, and a lot of bubbles B generate | occur | produce on the deaeration processing dish 3 ... (step S4). As a result, gas components such as dissolved oxygen in the water to be treated Wo are released as bubbles B, and are thus discharged into the atmosphere by being sucked into the vacuum pump 31.

  On the other hand, the treated water Ws from which gaseous components such as dissolved oxygen are removed is generated on the degassed treatment dishes 3. The treated water Ws falls from the degassed treatment dishes 3. The treated water Ws flows through the lower surface of the deaeration tank 2 to the water pipes 8, and is stored in the water tank 7 through the water pipes 8. Then, when the water level Lw of the treated water Ws stored in the water tank 7 rises and reaches the upper limit level Lu, it is detected by the upper limit level detector 26u, so the sequence control unit 10 turns on the water pump 11 (water supply line) 33 is controlled to open) and the open / close valve 35 is controlled to be opened. Thereby, the treated water Ws in the water storage tank 7 is transferred to the water storage tank 9 (steps S5 and S6). At this time, a part of the treated water Ws fed from the water tank 7 to the water tank 9 is returned to the inside of the deaeration tank 2 by the return circuit 12. In this case, if the return circuit 12 is not provided, the water storage tank 7 side is sucked in vacuum, so that the water supply is not smoothly performed even if the water supply pump 11 is operated, but the negative pressure is reduced by the return circuit 12 and the water storage Water can be smoothly supplied from the tank 7 to the water storage tank 9. In addition, when the water level Lw of the treated water Ws in the water tank 7 falls and reaches the lower limit level Ld, the lower limit level detector 26d detects the water level Lw, so the sequence control unit 10 turns off the water pump 11 (water supply line 33). And the open / close valve 35 is controlled to be closed (steps S7 and S8). Accordingly, the water level Lw of the treated water Ws in the water tank 7 is maintained within a predetermined range by the sequence control unit 10.

  On the other hand, when the treated water Ws is stored in the water storage tank 9 and the water level Ltw of the treated water Ws rises and reaches the upper limit level Ltu, the upper limit level detector 36u detects it. Is controlled to be closed, and the deaeration process is stopped (steps S9 and S10). In this case, the vacuum pump 31 may continue to operate (ON) or may be stopped (OFF) as necessary. Further, when the treated water Ws is used in a hot water supply facility or the like and the water level Ltw of the treated water Ws in the water storage tank 9 falls and reaches the lower limit level Ltd, it is detected by the lower limit level detector 36d. 10 switches the water supply valve 29 to open (steps S11 and S1). When the vacuum pump 31 is stopped, the vacuum pump 31 is operated before the water supply valve 29 is opened. Thereby, the deaeration process is resumed. Therefore, the water level Ltw of the treated water Ws in the water storage tank 9 is maintained within a predetermined range by the sequence control unit 10, and sufficient and stable supply of the treated water Ws to the hot water supply facility or the like is maintained.

  According to the water supply deaeration apparatus 1 according to the present embodiment, a large amount of bubbles B are generated by spraying the shower-like water to be treated Wo on the water to be treated Wo collected in the deaeration treatment dish 3. As a result, an efficient deaeration process is possible, and the deaeration effect can be greatly enhanced. Moreover, since the main part can be composed of the injection nozzles 4 and the deaeration treatment trays 3, the components can be simplified and the number of parts can be reduced. It can contribute to cost reduction. Moreover, in addition to ensuring a large amount of treatment per unit time, the amount of treatment can be easily changed, so that it can be flexibly adapted to various uses and various water supply conditions, and is excellent in versatility, and the water tank 9 is small. Furthermore, it can contribute to prevention of deterioration of the treated water Ws in the water storage tank 9.

  FIG. 5 shows treated water Ws (treated) with respect to the water flow rate [liter / minute] ejected from the ejection nozzle 4 in a state where the water temperature is set to 22 [° C.] and the vacuum pressure inside the deaeration tank 2 is set to −95 [kPa]. Data of dissolved oxygen concentration [mg / liter] of water Wo) is shown by a characteristic line Cs (Co). In this case, the dissolved oxygen concentration of the water to be treated (tap water) Wo is 7.73 [mg / liter] (characteristic line Co). On the other hand, the dissolved oxygen concentration of the treated water Ws after the deaeration process is performed by the feed water deaeration apparatus 1 according to the present embodiment is 0.82 [mg / l at a water flow rate of 10 [l / min]. ], It is reduced to 1.17 [mg / liter] at a water flow rate of 15 [liter / minute] and 1.56 [mg / liter] at a water flow rate of 20 [liter / minute]. Thus, the degassing effect is enhanced as the water flow rate decreases, and at a water flow rate of 10 [liter / min], the dissolved oxygen concentration is reduced to approximately 1/10. Such a water flow rate can be set to an optimum value by selecting the amount of the open / close valves 5.

  The embodiment has been described in detail above, but the present invention is not limited to such an embodiment, and the configuration, shape, quantity, material, etc. of the details are arbitrarily changed without departing from the gist of the present invention. , Can be added or deleted. For example, the shape, size, mounting method, quantity, etc. of the deaeration treatment dish 3... And the distance Hs between the deaeration treatment dish 3... And the injection nozzles 4. it can. Furthermore, the opening / closing valves 5... Have been shown to be switched by the sequence control unit 10, but may be manually operated types.

The block circuit diagram of the deaeration device for water supply concerning the preferred example of the present invention, A cross-sectional front view of the deaeration treatment dish and the injection nozzle provided in the water supply deaeration device, The top view of the deaeration processing dish with which the deaeration device for the water supply is provided, External front view of the water supply deaeration device, The characteristic figure which shows the data of the dissolved oxygen concentration with respect to the flow rate of the treated water deaerated by the deaerator for water supply, The flowchart which shows the operation processing procedure of the deaeration device for the water supply,

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Deaeration device for water supply 2 Deaeration tank 3 ... Deaeration processing dish 4 ... Injection nozzle 5 ... Opening / closing valve 6 ... Vacuum suction port 7 Water storage tank 8 ... Water pipe 9 Water storage tank 10 Sequence control part 11 Water supply pump 12 Return circuit 23 Bottom surface 24 Side surface Wo Water to be treated Ws Water to be treated Hs Predetermined distance B Bubble

Claims (1)

  Formed in a horizontally long cylinder shape in a degassing device for water supply that removes dissolved oxygen from the treated water and generates treated water by vacuum suction with respect to the treated water supplied to the deaeration tank A predetermined amount of water to be treated can be stored by having a degassing tank and a horizontal part arranged in the degassing tank in the horizontal direction and having a bottom surface and a side surface raised from the periphery of the bottom surface. A plurality of deaeration treatment trays are disposed at a predetermined distance with respect to each deaeration treatment pan, and shower-like water to be treated is blown against the surface of the water to be treated accumulated in the deaeration treatment pan. A plurality of injection nozzles for generating bubbles by causing collisions, and a plurality of vacuum suction ports for performing vacuum suction on the inside of the deaeration tank by being provided between the respective injection nozzles in the deaeration tank, Connect to each of the plurality of spray nozzles. An open / close valve that allows one or more of each injection nozzle to be selected and used, and is formed below the deaeration tank and connected to the deaeration tank by a water pipe and formed into a horizontally long cylinder The water tank connected to the water tank, and when the water level of the water tank reaches the upper limit level, water is supplied from the water tank to the water tank, and the water level of the water tank reaches the lower limit level. Then, the water supply from the water storage tank to the water storage tank is stopped, and when the water level of the water storage tank reaches the upper limit level, the deaeration process for the water to be treated is stopped, and the water level of the water storage tank reaches the lower limit level. If so, a part of the treated water discharged from the water supply pump that feeds water from the water storage tank to the water storage tank and a sequence control unit that performs a deaeration process on the water to be treated is stored in the deaeration tank or the water storage tank. Water deaerating apparatus characterized by comprising a be return circuit.

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