JPWO2018037460A1 - Cooling system - Google Patents

Abstract

The first water tank and the second water tank store cooling water. The first pipe forms a flow path communicating the exhaust gas outlet of the heater with the first position in the first water tank. The second pipe forms a flow passage communicating the second position vertically higher than the first position of the first water tank with the third position of the second water tank. The third pipe forms a flow path for discharging the exhaust gas from a fourth position vertically higher than the third position in the second water tank. The fourth pipe has a fifth position vertically lower than the fourth position in the first water tank, and a sixth position vertically lower than the fourth position in the second water tank, Form a flow path that connects the The power source sends the exhaust gas from the first water tank to the second water tank.

Description

  The present disclosure relates to a cooling device for cooling exhaust gas generated by combustion for heating a greenhouse for growing plants.

  There is known a cooling device for cooling an exhaust gas generated by combustion. Patent Document 1 discloses a cooling device used in a recovery device for absorbing carbon dioxide contained in exhaust gas into an absorbing solution and separating and recovering carbon dioxide from the absorbing solution. Specifically, as a cooling device, a cooling tower is disclosed which cools the exhaust gas so that carbon dioxide in the exhaust gas is easily absorbed by the absorbing liquid.

International Publication No. 2013/008914

By the way, the cooling device which cools the waste gas generated by the combustion for heating the greenhouse which grows a plant is considered.
As this cooling device, a configuration is conceivable in which a first water tank and a second water tank for storing cooling water are connected in series in the exhaust flow path. Specifically, the exhaust gas from the heater is cooled by passing the cooling water stored in the first water tank and further passing the cooling water stored in the second water tank. In addition, it is possible to use power sources, such as a blower, so that waste gas may flow through a 1st water tank and a 2nd water tank in order.

  However, in such a configuration, the cooling water in the first water tank is moved to the second water tank as the exhaust gas flows from the first water tank to the second water tank during operation of the power source. And the amount of cooling water in the first water tank may be reduced. In that case, a need arises to supply cooling water into the first water tank.

  One aspect of the present disclosure is desirable to reduce the need for refilling the cooling water into the water tank of the cooling device.

  One aspect of the present disclosure is a cooling device that cools an exhaust gas generated by combustion for heating a greenhouse for growing a plant, the first water tank, the second water tank, and the first pipe. , A second pipe, a third pipe, a fourth pipe, and a power source. The first water tank and the second water tank store cooling water. The first pipe forms a flow path communicating the exhaust gas outlet of the heater with the first position in the first water tank. The second pipe forms a flow passage communicating the second position vertically higher than the first position of the first water tank with the third position of the second water tank. The third pipe forms a flow path for discharging the exhaust gas from a fourth position vertically higher than the third position in the second water tank. The fourth pipe has a fifth position vertically lower than the fourth position in the first water tank, and a sixth position vertically lower than the fourth position in the second water tank, Form a flow path that connects the The power source sends the exhaust gas from the first water tank to the second water tank.

  According to such a configuration, it is possible to reduce the need for supplying the cooling water into the water tank. That is, in this cooling device, for example, the cooling water is stored in the first water tank so that the water surface is positioned between the first position and the second position in a state where the power source is not operated. Ru. Also, for example, in the same state, the cooling water is stored in the second water tank so that the water surface is located between the third position and the fourth position.

  Then, in a state where the power source is operated, the exhaust gas flowing into the first water tank from the first position is cooled in the process of passing the cooling water, and the cooled exhaust gas is discharged from the second position to the second Flow into the pipe. And, the exhaust gas which has flowed into the second water tank from the third position through the second pipe is further cooled in the process of passing the cooling water in the second water tank, and the second position from the fourth position Flow out of the water tank.

  When the power source is in operation, the cooling water in the first water tank moves to the second water tank as the exhaust gas flows from the first water tank to the second water tank, It is conceivable that the amount of cooling water in the water tank decreases and the amount of water in the second water tank increases. However, when the operation of the power source is stopped, the cooling water moves from the second water tank to the first water tank via the fourth pipe. As a result, the amount of water in the first water tank is increased. Therefore, it is possible to reduce the need to supply cooling water into the water tank.

One aspect of the present disclosure may further include a check valve provided in the fourth pipe to block the flow of cooling water from the first water tank to the second water tank.
According to such a configuration, the cooling water in the first water tank whose temperature is increased by absorbing the heat of the exhaust gas is prevented from flowing into the second water tank via the fourth pipe. . As a result, an increase in the temperature of the cooling water in the second water tank is suppressed. Therefore, it can suppress that the cooling performance of the waste gas by a 2nd water tank is impaired.

  One aspect of the present disclosure further includes a first overflow pipe for discharging water exceeding a first height vertically higher than a first position in the first water tank to the outside of the first water tank. You may have.

  According to such a configuration, even if the exhaust gas is cooled by the cooling water and the amount of water in the first water tank is increased by the condensed water in which the water in the exhaust gas is condensed, the water is discharged from the first overflow pipe Ru. Therefore, the water level in the first water tank can be maintained at or below the first height.

  One aspect of the present disclosure is to discharge water exceeding a second height vertically higher than the third position and the sixth position in the second water tank to the outside of the second water tank. May further be provided.

  According to such a configuration, even if the exhaust gas is cooled by the cooling water and the amount of water in the second water tank is increased by the condensed water in which the water content of the exhaust gas is condensed, the water is discharged from the second overflow pipe Ru. Therefore, the water level in the second water tank can be maintained at or below the second height.

In one aspect of the present disclosure, the cooling water stored in the first water tank and the second water tank may be alkaline.
According to such a configuration, when the exhaust gas passes through the cooling water, acidic substances such as sulfur oxides, nitrogen oxides and carbon dioxide contained in the exhaust gas can be neutralized.

It is a figure which shows the structure of a carbon-dioxide supply apparatus. It is a figure showing an example of the cooling water in the 1st water tank in the state where a blower has stopped, and the water level in the 2nd water tank. It is a figure showing an example of the cooling water in the 1st water tank in the state where a blower is operating, and the water level of the cooling water in the 2nd water tank.

  DESCRIPTION OF SYMBOLS 1 ... Carbon dioxide supply apparatus, 2 ... Warmer, 21 ... Exhaust gas outlet, 10 ... 1st water tank, 20 ... 2nd water tank, 30 ... Purification tank, 40 ... Adsorption part, 51 ... 1st pipe , 52: second pipe, 53: third pipe, 54: fourth pipe, 60: blower, 81: first check valve, A1: first position, A2: second position, A3 ... 3rd position, A4 ... 4th position, A5 ... 5th position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[1. Constitution]
The carbon dioxide supply device 1 shown in FIG. 1 is used in a greenhouse for cultivating plants. In the present embodiment, the greenhouse is used for institutional horticulture. The carbon dioxide supply device 1 is a device for supplying a gas containing a high concentration of carbon dioxide to the interior of the greenhouse (hereinafter simply referred to as the interior).

  The carbon dioxide supply device 1 is used as follows. That is, the greenhouse 2 is provided with the heater 2 which heats indoor air. The heating device 2 heats indoor air by burning a fuel such as kerosene or heavy oil so that the temperature does not decrease excessively and the growth of plants is not inhibited at night. Connected to the exhaust gas outlet 21 of the heater 2 is a chimney 3 for discharging the exhaust gas generated by the combustion to the outside of the greenhouse.

  The carbon dioxide supply device 1 recovers and accumulates carbon dioxide contained in the exhaust gas discharged from the heater 2 at night. The exhaust gas from which carbon dioxide is recovered is discharged into the room. Then, the carbon dioxide supply device 1 supplies the accumulated carbon dioxide to the room during the daytime when the photosynthesis of the plant becomes active. This promotes the photosynthesis of plants in the room.

  The carbon dioxide supply device 1 includes a first water tank 10, a second water tank 20, a purification tank 30, and an adsorption unit 40. In addition, the carbon dioxide supply apparatus 1 includes a first pipe 51, a second pipe 52, a third pipe 53, a fourth pipe 54, a fifth pipe 55, and a blower 60. . Further, the carbon dioxide supply device 1 includes a first overflow pipe 71, a second overflow pipe 72, a first check valve 81, a second check valve 82, and a third check valve 83. And.

  The first water tank 10 and the second water tank 20 are tanks for storing cooling water. The first water tank 10 and the second water tank 20 have a function of cooling the exhaust gas so as to lower the temperature of the exhaust gas to an appropriate temperature at which adsorption of carbon dioxide in the exhaust gas is easily performed in the adsorption unit 40 .

  Each of the first water tank 10 and the second water tank 20 has a cylindrical side, and a ceiling and a bottom covering the opening at both axial ends of the side. The first water tank 10 and the second water tank 20 are provided such that the axial direction of the side portion coincides with the vertical direction. In this state, among the openings at both axial ends of the side, the upper opening is covered by the ceiling and the lower opening is covered by the bottom. The first water tank 10 and the second water tank 20 have the same size and shape, and are provided so as to have the same vertical position. In the present embodiment, alkaline cooling water, specifically, a calcium carbonate aqueous solution is stored in the first water tank 10 and the second water tank 20.

  The purification tank 30 is a tank for removing harmful substances (for example, sulfur oxides, nitrogen oxides, etc.) that adversely affect the growth of plants from the exhaust gas. In the purification tank 30, a filter containing granular activated carbon is accommodated. Then, when the exhaust gas passes through the filter, the harmful substance contained in the exhaust gas is adsorbed to the granular activated carbon, whereby the harmful substance is removed. The purification tank 30 is substantially the same in size and shape as the first water tank 10 and the second water tank 20. Further, the purification tank 30 is provided so that the axial direction coincides with the vertical direction, similarly to the first water tank 10 and the second water tank 20.

  The adsorption unit 40 has adsorption tanks 41 to 48 which are a plurality of (eight in this example) tanks for adsorbing and accumulating carbon dioxide in the exhaust gas. In the adsorption tanks 41 to 48, an adsorbent such as activated carbon is accommodated. The carbon dioxide contained in the exhaust gas introduced into the adsorption unit 40 is adsorbed and accumulated by the adsorbents in the adsorption tanks 41 to 48. The exhaust gas to which carbon dioxide is adsorbed is discharged into the room from an exhaust port 49 connected to the adsorption unit 40.

  The first pipe 51 is a substantially S-shaped pipe whose one end is connected to the middle of the chimney 3 and the other end is connected to the bottom of the first water tank 10. The end of the first pipe 51 connected to the chimney 3 is arranged to be higher in the vertical direction than the end connected to the first water tank 10. The first pipe 51 forms a flow path communicating the exhaust gas outlet 21 of the heater 2 with the first position A1 at the bottom which is the lowest portion of the first water tank 10 in the vertical direction. .

  The second pipe 52 is a substantially S-shaped pipe having one end connected to the ceiling of the first water tank 10 and the other end connected to the bottom of the second water tank 20. The second pipe 52 forms a flow path communicating the second position A2 with the third position A3. The second position A2 is a position higher in the vertical direction than the first position A1 in the first water tank 10, specifically, in the ceiling portion which is the highest portion in the vertical direction in the first water tank 10 It is a position. The third position A3 is vertically lower than the second position A2 in the second water tank 20. Specifically, the third position A3 is a position at the bottom which is the lowest portion of the second water tank 20 in the vertical direction.

  Here, that the position where the other pipe is connected is higher than the position where one pipe is connected means that the other pipe is connected rather than the lowermost end of the inner surface of the connected end of one pipe. It means that the lowest end on the inner surface of the end is high.

  The third pipe 53 is a substantially S-shaped pipe having one end connected to the ceiling of the second water tank 20 and the other end connected to the bottom of the purification tank 30. The third pipe 53 forms a flow path for discharging the exhaust gas from the fourth position A4. The fourth position A4 is a position higher in the vertical direction than the third position A3 in the second water tank 20, specifically, in the ceiling portion which is the highest portion in the vertical direction in the second water tank 20. It is a position.

  The fourth pipe 54 is a straight pipe whose one end is connected to the side of the first water tank 10 and the other end is connected to the side of the second water tank 20. The fourth pipe 54 forms a flow path that communicates the fifth position A5 of the first water tank 10 with the sixth position A6 of the second water tank 20. Here, the fifth position A5 and the sixth position A6 are both lower in the vertical direction than the fourth position A4 in the second water tank 20.

  In the present embodiment, the fifth position A5 and the sixth position A6 are at the same height, and the fourth pipe 54 is provided horizontally. In particular, the fifth position A5 is higher in the vertical direction than the first position A1 in the first water tank 10 and is lower in the vertical direction than the second position A2. The sixth position A6 is higher in the vertical direction than the third position A3 in the second water tank 20 and lower in the vertical direction than the fourth position A4.

The fifth pipe 55 is a pipe whose one end is connected to the ceiling portion of the purification tank 30 and whose other end is connected to the suction unit 40.
The blower 60 is a blower that blows the exhaust gas toward the suction unit 40 by the rotation of a fan by an electric motor. In the present embodiment, the blower 60 is disposed in the middle of the fifth pipe 55.

  The first overflow pipe 71 is a substantially L-shaped pipe having one end connected to the side portion of the first water tank 10 and the other end opened to the atmosphere side. Specifically, one end thereof is provided perpendicular to the axial direction of the side portion, and the other end is directed downward.

  In the present embodiment, one end of the first overflow pipe 71 is provided at a position vertically higher than the fifth position A5 in the first water tank 10 and lower than the second position A2 vertically There is.

  The first overflow pipe 71 is an exhaust system formed outside the first water tank 10, specifically, the carbon dioxide supply device 1, of water exceeding a first height h1 which is a predetermined height. To the outside of the The first height h1 means the height of the lowermost end of the end of the first overflow pipe 71 connected to the first water tank 10 among the both ends.

  The second overflow pipe 72 is a substantially L-shaped pipe whose one end is connected to the side of the second water tank 20 and whose other end is open to the atmosphere. Specifically, one end thereof is provided perpendicular to the axial direction of the side portion, and the other end is directed downward.

  In the present embodiment, one end of the second overflow pipe 72 is provided at a position vertically higher than the sixth position A6 in the second water tank 20 and lower than the fourth position A4 in the vertical direction. There is. In particular, one end of the second overflow pipe 72 and one end of the first overflow pipe 71 are provided at the same height in the vertical direction.

  The second overflow pipe 72 is an exhaust system formed outside the second water tank 20, specifically, the carbon dioxide supply device 1, for water exceeding a second height h2 which is a predetermined height. To the outside of the The second height h2 means the height of the lowermost end of the end portion of the second overflow pipe 72 connected to the second water tank 20 among the both ends. In the present embodiment, the fifth position A5 and the sixth position A6 are designed to be lower than the height h2.

The first check valve 81 is provided in the fourth pipe 54 to prevent the flow of cooling water from the first water tank 10 to the second water tank 20.
The second check valve 82 is provided in the first overflow pipe 71 and prevents the flow of air from the outside of the first water tank 10 into the first water tank 10. Thus, when the blower 60 is operated, the flow of air into the first water tank 10 through the first overflow pipe 71 is suppressed.

  The third check valve 83 is provided in the second overflow pipe 72 and prevents the flow of air from the outside of the second water tank 20 into the second water tank 20. Thereby, when the blower 60 is operated, the flow of air into the second water tank 20 via the second overflow pipe 72 is suppressed.

[2. Action]
Subsequently, a carbon dioxide adsorption process of adsorbing and storing carbon dioxide in exhaust gas in the carbon dioxide supply device 1 will be described with reference to FIGS. 1 to 3. In FIG. 1 and FIG. 3, the hatched arrows represent the flow of exhaust gas, and the non-hatched arrows represent the flow of water.

  In the carbon dioxide adsorption process, the heater 2 and the blower 60 are operated. In the state where the blower 60 is in operation, the exhaust gas flows from the heater 2 side to the adsorption unit 40 side. Specifically, first, the exhaust gas discharged from the exhaust gas outlet 21 of the heater 2 flows into the chimney 3 and from the chimney 3 into the first pipe 51. Then, the exhaust gas flows into the first water tank 10 from the first position A1 via the first pipe 51. And exhaust gas is cooled and neutralized in the process of passing cooling water. Thereafter, the exhaust gas flows into the second pipe 52 from the second position A2.

  In addition, by cooling exhaust gas, the condensed water which the water | moisture content in waste gas condensed may stay, and the water quantity in the 1st water tank 10 may increase. In this case, when the water level W1 in the first water tank 10 rises and exceeds the first height h1, water exceeding the first height h1 from the first overflow pipe 71 becomes the first water. It is discharged to the outside of the tank 10.

  The exhaust gas having passed through the second pipe 52 flows into the second water tank 20 from the third position A3. Then, the exhaust gas is further cooled and neutralized in the process of passing the cooling water. Thereafter, the exhaust gas flows into the third pipe 53 from the fourth position A4.

  In addition, when exhaust gas is cooled, condensed water may stay and the water volume in the 2nd water tank 20 may increase. In this case, when the water level W2 in the second water tank 20 rises and exceeds the second height h2, water exceeding the second height h2 from the second overflow pipe 72 becomes the second water. It is discharged to the outside of the tank 20.

  Further, in the state where the blower 60 is in operation, as the exhaust gas flows from the first water tank 10 to the second water tank 20, the cooling water in the first water tank 10 makes the second pipe 52 It may move to the second water tank 20 via the second water tank 20. In this case, the amount of water is biased to the second water tank 20 side. This point will be described in detail later.

  In the present embodiment, since the fourth pipe 54 is provided with the first check valve 81, the first water tank 10 to the second water tank 20 through the fourth pipe 54. Cooling water and exhaust gases are prevented from flowing in.

  The exhaust gas having passed through the third pipe 53 flows into the purification tank 30. The exhaust gas is purified by removing harmful substances in the process of passing through the purification tank 30. The purified exhaust gas flows into the fifth pipe 55.

  The exhaust gas that has passed through the fifth pipe 55 flows into the adsorption unit 40. While the exhaust gas passes through the adsorption tanks 41 to 48, carbon dioxide contained in the exhaust gas is adsorbed by the adsorbents in the adsorption tanks 41 to 48, and is stored. The exhaust gas to which carbon dioxide is adsorbed is discharged into the room from the exhaust port 49.

Subsequently, changes in the water level in the first water tank 10 and the second water tank 20 will be described using FIGS. 2 and 3.
In the state where the blower 60 is stopped, cooling water is stored in the first water tank 10 and the second water tank 20 as shown in FIG. 2 as an example. That is, in the first water tank 10, the water level W1 is higher in the vertical direction than the fifth position A5 to which the fourth pipe 54 is connected, and the second water pipe 10 is connected to the second water tank 10. The cooling water is stored so as to be vertically lower than the position A2.

  On the other hand, in the second water tank 20, the water level W2 is higher in the vertical direction than the sixth position A6 where the fourth pipe 54 is connected, and the fourth water tank 20 is connected with the third pipe 53. The cooling water is stored so as to be vertically lower than the position A4. In this example, the water level W1 in the first water tank 10 and the water level W2 in the second water tank 20 are at the same height.

  In the present embodiment, the carbon dioxide supply device 1 is designed such that the end of the first pipe 51 connected to the chimney 3 is always higher than the water level W1. For this reason, backflow of the cooling water from the first water tank 10 to the chimney 3 is suppressed.

  On the other hand, in the state where the blower 60 is in operation, the exhaust gas flows from the first water tank 10 into the second water tank 20 through the second pipe 52. Along with this, a part of the cooling water in the first water tank 10 may flow into the second water tank 20 via the second pipe 52. In this case, the amount of water in the first water tank 10 decreases, and the amount of water in the second water tank 20 increases. That is, the amount of water is biased to the second water tank 20 side. Here, the cooling water in the second water tank 20 can flow into the first water tank 10 via the fourth pipe 54. However, when the blower 60 is in operation, the pressure in the second water tank 20 is lower than the pressure in the first water tank 10. Therefore, as shown in FIG. 3, the state where the water level difference is generated between the first water tank 10 and the second water tank 20 is maintained, and the water level W1 in the first water tank 10 is higher than the water level W1. The water level W2 in the second water tank 20 is higher.

  In the situation shown in FIG. 3, the water level W2 in the second water tank 20 is higher than the fifth position A5 and the sixth position A6 even when the blower 60 is in operation. In other words, the water level W2 in the second water tank 20 is higher than the entire fourth pipe 54. More specifically, the water level W2 is higher than the vertically highest position in the line connecting the lowest points in the continuous cross sections of the inner surface of the fourth pipe 54.

  Thus, when the operation of the blower 60 is stopped in a state where the water level W2 in the second water tank 20 is higher than the sixth position A6, the first water tank 10 and the second water tank 20 The cooling water in the second water tank 20 flows into the first water tank 10 through the fourth pipe 54 so that the water level difference is eliminated between the two. As a result, the water level W1 in the first water tank 10 rises, the water level W2 in the second water tank 20 falls, and the state without the water level difference as shown in FIG. 2 is realized again.

[3. effect]
According to the embodiment described above, the following effects can be obtained.
(1) In the present embodiment, the fourth pipe 54 forming the flow path communicating the fifth position A5 of the first water tank 10 with the sixth position A6 of the second water tank 20 is It is provided.

  While the blower 60 is in operation, the cooling water in the first water tank 10 is moved to the second water tank 20, and the amount of cooling water in the first water tank 10 is reduced. The amount of water in the water tank 20 may increase. However, when the operation of the blower 60 is stopped, the cooling water moves from the second water tank 20 to the first water tank 10 via the fourth pipe 54. As a result, the amount of water in the first water tank 10 is increased. Therefore, the need for refilling the cooling water into the first water tank 10 can be reduced.

  (2) In the present embodiment, the fourth pipe 54 is provided with a first check valve 81 that prevents the flow of cooling water from the first water tank 10 to the second water tank 20. For this reason, it is suppressed that the cooling water in the 1st water tank 10 which absorbed the heat of exhaust gas and the temperature rose flows in into the 2nd water tank 20 via the 4th pipe 54. As a result, it is suppressed that the temperature of the cooling water in the 2nd water tank 20 rises. Therefore, it can suppress that the cooling performance of the waste gas by the 2nd water tank 20 is impaired.

  (3) In the present embodiment, the first overflow pipe 71 is connected to the first water tank 10. Therefore, even if the amount of water in the first water tank 10 is increased by the condensed water, the water is discharged from the first overflow pipe 71. Therefore, the water level in the first water tank 10 can be maintained at or below the first height h1.

  (4) In the present embodiment, the second overflow pipe 72 is connected to the second water tank 20. Therefore, even if the amount of water in the second water tank 20 increases due to the condensed water, the water is discharged from the second overflow pipe 72. Therefore, the water level in the second water tank 20 can be maintained at or below the second height h2.

  (5) In the present embodiment, alkaline cooling water is stored in the first water tank 10 and the second water tank 20. Therefore, when the exhaust gas passes through the cooling water, acidic substances such as sulfur oxides, nitrogen oxides and carbon dioxide contained in the exhaust gas can be neutralized. As a result, it is possible to suppress the decrease in the carbon dioxide adsorption efficiency in the adsorption unit 40.

  That is, in the carbon dioxide supply device 1 of the present embodiment, adsorption tanks 41 to 48 containing an adsorbent such as activated carbon are provided downstream of the second water tank 20 in the exhaust flow path. If the acidic substance in the exhaust gas is not removed and the exhaust gas containing the acidic substance flows into the adsorption tanks 41 to 48, the adsorption efficiency of carbon dioxide of the adsorbent may be lowered. On the other hand, in the present embodiment, by using alkaline cooling water, the acidic substance in the exhaust gas is neutralized, and the exhaust gas containing the acidic substance is suppressed from flowing into the adsorption tanks 41 to 48. Therefore, it can suppress that the adsorption efficiency of the carbon dioxide in adsorption part 40 falls.

In the present embodiment, the blower 60 corresponds to an example of a power source.
[4. Other embodiments]
As mentioned above, although the form for implementing this indication was described, this indication can be variously deformed and implemented, without being limited to an above-mentioned embodiment.

  (1) In the said embodiment, although 1st position A1 is a position in the bottom part of the 1st water tank 10, 1st position is not restricted to this. The first position may be, for example, a position on the side of the first water tank.

  (2) In the said embodiment, although 2nd position A2 is a position in the ceiling part of the 1st water tank 10, 2nd position is not restricted to this. The second position may be, for example, a position on the side of the first water tank. Also in this case, the second position is in the vertical direction more than the first position so that the exhaust gas flowing from the first position ascends in the first water tank and flows out from the second position. Designed to be high.

  (3) In the said embodiment, although 3rd position A3 is a position in the bottom part of the 2nd water tank 20, 3rd position is not restricted to this. The third position may be, for example, a position on the side of the second water tank.

  (4) In the said embodiment, although 4th position A4 is a position in the ceiling part of the 2nd water tank 20, 4th position is not restricted to this. The fourth position may be, for example, a position on the side of the second water tank. Also in this case, the fourth position is in the vertical direction more than the third position so that the exhaust gas flowing in from the first position ascends in the second water tank and flows out from the fourth position. Designed to be high.

  (5) In the above embodiment, the fifth position A5 and the sixth position A6 have the same height, but the relationship between the heights of the fifth position and the sixth position is limited to this. Absent. The fifth position and the sixth position may be, for example, different heights in the vertical direction. Further, the fifth position and the sixth position are not limited to those in the above embodiment.

  (6) In the above embodiment, the fourth pipe 54 is straight, but the shape of the fourth pipe is not limited to this. The fourth tube may, for example, be in a bent shape. In this case, for example, in a state where the fourth pipe is connected to the first water tank and the second water tank, the highest position in the fourth pipe is vertically lower than the fourth position. , A fourth tube may be provided. Specifically, the end of the inner surface of the fourth pipe 54, the highest point in the vertical direction in the line connecting the lowermost points in the continuous cross sections is connected to the fourth position of the third pipe A fourth tube may be provided to be lower than the lowermost end of the inner surface of the.

Similarly, the shapes of the first to third and fifth pipes and the like are not limited to those in the above embodiment.
(7) The positional relationship between the first water tank 10 and the second water tank 20 is not limited to that of the above embodiment. The first water tank, 10 and the second water tank 20 may be provided, for example, so that the positions in the vertical direction are different from each other.

  The size and shape of the first water tank and the second water tank are not limited to those of the above embodiment. The first water tank and the second water tank may be, for example, prismatic. Also, the first water tank and the second water tank may not be identical in size and shape, for example.

  (8) In the said embodiment, although the 1st non-return valve 81 is provided in the 4th pipe | tube 54, the presence or absence of a 1st non-return valve is not restricted to this. For example, the fourth pipe 54 may not be provided with the first check valve 81.

  (9) Although the blower 60 is provided to the third pipe 53 in the above embodiment, the location where the blower is provided is not limited to this. The blower may be provided, for example, on the first pipe 51 or the second pipe 52. Also, the blower may be provided, for example, upstream of the first pipe 51 or downstream of the third pipe 53.

(10) Although the blower 60 is illustrated as the power source in the above embodiment, the power source is not limited to this. The power source may be, for example, a blower fan or the like.
(11) In the above embodiment, the cooling water stored in the first water tank 10 and the second water tank 20 is a calcium carbonate aqueous solution, but the cooling water is not limited to this. For example, the cooling water may be an alkaline liquid other than the calcium carbonate aqueous solution. The cooling water may also be a liquid other than alkaline, for example, ordinary water.

  (12) The plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or one function possessed by one component may be realized by a plurality of components . Also, a plurality of functions possessed by a plurality of components may be realized by one component, or one function realized by a plurality of components may be realized by one component. In addition, part of the configuration of the above embodiment may be omitted. In addition, at least a part of the configuration of the above-described embodiment may be added to or replaced with the configuration of the other above-described embodiment. In addition, all the aspects contained in the technical thought specified only by the words described in the claim are an embodiment of this indication.

Claims (5)

A cooling device for cooling exhaust gas generated by combustion for heating a greenhouse for growing plants, comprising:
A first water tank and a second water tank for storing cooling water;
A first pipe forming a flow passage communicating the exhaust gas outlet of the heater with the first position of the first water tank;
A second pipe forming a flow passage communicating a second position vertically higher than the first position in the first water tank and a third position in the second water tank ,
A third pipe forming a flow path for discharging exhaust gas from a fourth position vertically higher than the third position in the second water tank;
Communication is made between a fifth position vertically lower than the fourth position in the first water tank and a sixth position vertically lower than the fourth position in the second water tank A fourth pipe forming a flow path
A power source for delivering exhaust gas from the first water tank to the second water tank;
A cooling device provided with The cooling device according to claim 1, wherein
The cooling device, further comprising a check valve provided in the fourth pipe to prevent the flow of the cooling water from the first water tank to the second water tank. The cooling device according to claim 1 or 2, wherein
The cooling device according to claim 1, further comprising: a first overflow pipe for discharging water exceeding a first height vertically higher than the first position in the first water tank to the outside of the first water tank. . The cooling device according to any one of claims 1 to 3, wherein
A second overflow pipe for discharging water exceeding a second height vertically higher than the third position and the sixth position in the second water tank to the outside of the second water tank The cooling device further comprising: The cooling device according to any one of claims 1 to 4, wherein
The cooling device in which the cooling water stored in the first water tank and the second water tank is alkaline.

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