JP2019041646A - Carbon dioxide application device - Google Patents

Abstract

To provide a carbon dioxide application device capable of suppressing the suction of a liquid in a liquid storage tank.SOLUTION: There is provided a carbon dioxide application device for supplying carbon dioxide contained in a combustion exhaust gas in an agricultural greenhouse, which comprises at least one liquid storage tank 3 which is configured to store a liquid L and pass the combustion exhaust gas through the liquid L, a supply passage which is configured to supply the combustion exhaust gas passed through the liquid L to the downstream side of the liquid storage tank 3 and a device which is provided in the supply passage and leads the combustion exhaust gas passed through the liquid L to the downstream side of the liquid storage tank 3. The at least one liquid storage tank 3 has a shielding part 31 disposed upward in the vertical direction on a liquid surface of the liquid L and at a position overlapping with a discharge port 33 of the combustion exhaust gas in the at least one liquid storage tank 3 viewed from the vertical direction. The shielding part 31 faces the discharge port 33 has an inclined surface 31A inclined to the horizontal direction.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a carbon dioxide application device.

  In order to improve the yield and quality of horticultural plants, carbon dioxide application devices that apply carbon dioxide in agricultural houses are known. On the other hand, the agricultural house is provided with a heater for preventing a temperature drop at night. A warming machine burns heavy oil, kerosene, etc., and supplies warm air to an agricultural house.

  Therefore, a carbon dioxide application device has been devised that collects and stores carbon dioxide in combustion exhaust gas generated from a warmer and supplies the carbon dioxide into an agricultural house at an arbitrary timing (see Patent Document 1).

In this carbon dioxide application device, after the combustion exhaust gas is allowed to pass through the liquid in the liquid storage tank and cooled, the carbon dioxide in the combustion exhaust gas is adsorbed by the adsorption tank.
The carbon dioxide adsorbed in the adsorption tank is desorbed from the adsorption tank, for example, during the daytime and applied to the agricultural house.

Japanese Patent Application Laid-Open No. 2015-142531

  In the carbon dioxide application device, in order to pass the combustion exhaust gas through the liquid in the liquid storage tank and send it to the adsorption tank or the agricultural house, the combustion exhaust gas is sucked and the combustion exhaust gas that has passed through the liquid storage tank is removed from the agricultural house. A device (so-called aspirator) for guiding the inside is provided. By this aspirator, the combustion exhaust gas is bubbled in the liquid storage tank and supplied to the adsorption tank.

  However, bubbling of the combustion exhaust gas in the liquid storage tank may cause part of the liquid to be sucked up by the suction device together with the combustion exhaust gas. Liquid sucking up causes a malfunction of the aspirator.

  An object of one aspect of the present disclosure is to provide a carbon dioxide application device capable of suppressing the suction of liquid in a liquid storage tank.

  One aspect of the present disclosure is a carbon dioxide application device that supplies carbon dioxide contained in combustion exhaust gas into an agricultural house. The carbon dioxide application device stores liquid and supplies at least one liquid storage tank configured to pass the combustion exhaust gas through the liquid, and supplies the combustion exhaust gas that has passed through the liquid to the downstream side of the liquid storage tank. And a device that is provided in the supply channel and guides the combustion exhaust gas that has passed through the liquid to the downstream side of the liquid storage tank. At least one liquid storage tank has a shielding part arranged in the position which overlaps with the exhaust port of combustion exhaust gas in at least one liquid storage tank seeing from the perpendicular direction above the liquid level of the liquid. The shielding portion has an inclined surface that faces the discharge port and is inclined with respect to the horizontal direction.

  According to such a configuration, the liquid sucked up with the combustion exhaust gas adheres to the shielding portion that blocks the flow path of the combustion exhaust gas, and is prevented from being discharged from the liquid storage tank to the aspirator side. Moreover, the liquid droplet adhering to the upper side of the shielding part falls downward by the inclined surface. Therefore, it is suppressed that a droplet stays on the shielding part and is sucked up by the suction device. As a result, the failure of the aspirator due to liquid suction is suppressed. In addition, a decrease in the liquid in the liquid storage tank can be suppressed.

  In one aspect of the present disclosure, the through hole may not be formed in the inclined surface. According to such a configuration, it is possible to more reliably suppress liquid suction by the aspirator.

  In one aspect of the present disclosure, the at least one liquid storage tank may include a plate that is disposed so that the plate surface is inclined with respect to the horizontal direction as the shielding portion. Further, the plate may be arranged such that at least a part of the inner surface of at least one liquid storage tank is spaced apart. According to such a configuration, it is possible to suppress the suction of the liquid by the suction device while securing the flow path of the combustion exhaust gas with a relatively simple configuration.

  In one aspect of the present disclosure, when viewed from the vertical direction, the discharge port overlaps a portion of the plate that is located on the lower side in the vertical direction than the center of gravity of the plate, and is located on the upper side of the plate in the vertical direction from the center of gravity of the plate. It does not have to overlap the part. According to such a configuration, the inclined surface of the plate and the discharge port can be separated without lowering the position of the plate. As a result, it is possible to prevent liquid droplets from being sucked into the discharge port while saving space.

FIG. 1 is a block diagram schematically showing a configuration of a carbon dioxide application device in the embodiment. FIG. 2 is a schematic diagram showing a liquid storage tank of the carbon dioxide application device of FIG. FIG. 3 is a schematic plan view showing the positional relationship between the plate and the discharge port of the liquid storage tank of FIG. 4 is a schematic diagram showing the flow of combustion exhaust gas and liquid in the liquid storage tank of FIG. FIG. 5 is a schematic diagram illustrating a liquid storage tank in an embodiment different from that in FIG. 2. FIG. 6 is a schematic view showing a carbon dioxide application device in an embodiment different from that in FIG.

Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
A carbon dioxide application apparatus 1 shown in FIG. 1 is an apparatus for recovering carbon dioxide contained in combustion exhaust gas and supplying it into an agricultural house. The carbon dioxide application device 1 is disposed inside or outside the agricultural house.

The carbon dioxide application device 1 includes a combustion device 2, a first liquid storage tank 3, a second liquid storage tank 4, a blower 5, an adsorption tank 6, and a control unit 7.
Further, the carbon dioxide application device 1 includes an exhaust gas flow channel 10, a first intake flow channel 11, a cooling air flow channel 12, a second intake flow channel 13, an applied air flow channel 14, and a supply flow channel. 15.

<Combustion device>
The combustion device 2 is a device that burns fuel such as heavy oil and kerosene at night to heat the air in the agricultural house. The combustion exhaust gas is discharged outside the agricultural house through the exhaust gas flow path 10 which is a chimney.

<First liquid storage tank>
The first liquid storage tank 3 is a device for cooling and purifying a part of the combustion exhaust gas generated from the combustion device 2 with the liquid L. In the present embodiment, the first liquid storage tank 3 is cylindrical.

  The first liquid storage tank 3 stores the liquid L therein. The first liquid storage tank 3 is configured to take in the combustion exhaust gas generated in the combustion device 2 and pass the taken-in combustion exhaust gas through the liquid L. The combustion exhaust gas is cooled by heat exchange with the liquid L, and part of the components contained by the compound contained in the liquid L is removed. The volume of the liquid L stored in the first liquid storage tank 3 is smaller than the volume of the first liquid storage tank 3.

  Specifically, a first intake passage 11 is connected to the first liquid storage tank 3, and combustion exhaust gas is supplied from the first intake passage 11 into the liquid L. The first intake flow channel 11 is connected to the exhaust gas flow channel 10 and takes in combustion exhaust gas. The liquid L has entered the first intake channel 11 up to the same position as the liquid level in the first liquid storage tank 3.

  In FIG. 1, the end of the first intake channel 11 is connected to the lower surface of the first liquid storage tank 3, but the end of the first intake channel 11 is connected to the first liquid storage tank 3. It may be connected to the side surface. Further, the first intake channel 11 may be disposed so as to open into the liquid L from the upper surface of the first liquid storage tank 3 through the inside of the first liquid storage tank 3. The same applies to the second intake passage 13 of the second liquid storage tank 4 to be described later.

  The combustion exhaust gas supplied into the liquid L floats as bubbles in the liquid L. That is, bubbling is performed. The combustion exhaust gas that has passed through the liquid L is taken into the second liquid storage tank 4 by the second intake passage 13.

  The liquid L stored in the first liquid storage tank 3 is preferably one that can remove harmful substances such as sulfides and nitrides contained in the combustion exhaust gas. For example, an aqueous solution of a compound that reacts with sulfide or nitride can be suitably used as the liquid L.

  As shown in FIG. 2, the first liquid storage tank 3 includes a plate 31 as a shielding portion that prevents the liquid L from being sucked up. The plate 31 is disposed vertically above the liquid level of the liquid L, and closes at least a part of the flow path of the combustion exhaust gas in the first liquid storage tank 3.

  The plate 31 is supported by a plate support portion 32 so that the plate surface is inclined with respect to the horizontal direction. That is, the plate 31 has an inclined surface 31A that is inclined in the horizontal direction as the upper surface (that is, the upper surface) in the vertical direction.

  As shown in FIG. 3, the plate 31 is a flat disk in which no through hole is formed. The diameter of the plate 31 is smaller than the inner diameter of the first liquid storage tank 3. Further, the plate 31 is disposed so as to be separated from the entire inner surface of the first liquid storage tank 3. Therefore, a flue gas passage is formed around the entire periphery of the plate 31.

The plate 31 is disposed at a position overlapping the combustion exhaust gas outlet 33 in the first liquid storage tank 3 when viewed from the vertical direction (that is, in plan view). Therefore, the inclined surface 31 </ b> A faces the discharge port 33. Further, the lower end of the inclined surface 31 </ b> A coincides with the edge of the plate 31. That is, in the present embodiment, the entire upper surface of the shielding portion is the inclined surface 31A.

  As indicated by the solid line arrow A in FIG. 4, the combustion exhaust gas that has passed through the liquid L passes through between the plate 31 and the inner surface of the first liquid storage tank 3 and is discharged from the discharge port 33. The discharge port 33 constitutes a part of the second intake channel 13.

  The liquid L rising in the first liquid storage tank 3 together with the combustion exhaust gas collides with the lower surface of the plate 31 (that is, the surface opposite to the inclined surface 31A) or condenses on the inclined surface 31A which is the upper surface of the plate 31. To do. The droplet attached to the lower surface of the plate 31 falls due to its own weight. Further, the droplets attached to the inclined surface 31A of the plate 31 fall from the plate 31 along the inclined surface 31A as shown by the broken arrow B in FIG.

  The inclination angle (that is, the acute angle formed between the inclined surface 31A and the horizontal direction) θ of the plate 31 with respect to the horizontal direction is not particularly limited as long as the droplet on the inclined surface 31A falls. The inclination angle θ of the plate 31 is, for example, more than 0 ° and 45 ° or less.

  When viewed from the vertical direction, it is preferable that the discharge port 33 overlaps a portion of the plate 31 that is positioned below the center of gravity of the plate 31 in the vertical direction. Moreover, it is preferable that the discharge port 33 does not overlap with a portion of the plate 31 that is positioned above the center of gravity of the plate 31 in the vertical direction. That is, in the plate 31, the lower part of the inclined surface 31A in the vertical direction intersects with the virtual pipe extending the discharge port 33 downward, and the upper part of the inclined surface 31A in the vertical direction does not intersect with the virtual pipe. It should be arranged. By arranging the plate 31 in this way, the inclined surface 31A and the discharge port 33 can be separated without lowering the position of the plate 31. As a result, it is possible to prevent the droplets from being sucked into the discharge port 33 while saving space.

  The plate support portion 32 is not limited as long as it is a member that can support the plate 31. Therefore, for example, a cooling pipe 12 </ b> A described later may be used as the plate support portion 32. That is, a through hole may be provided in the plate 31, and the cooling pipe 12A may be inserted into the through hole to fix both.

  The first liquid storage tank 3 is provided with a drainage channel 17 as shown in FIG. The drainage channel 17 is a channel for keeping the liquid level of the liquid L constant by discharging the liquid L to the outside of the first liquid storage tank 3 by liquid pressure when the liquid level of the liquid L rises. is there.

  In the present embodiment, the drainage channel 17 is provided with a check valve (that is, a check valve) 17A. Note that the check valve 17 </ b> A is not necessarily provided in the drainage channel 17 as long as the liquid L can be discharged as the liquid level of the liquid L increases.

  Furthermore, a cooling air flow path 12 for cooling the liquid L is connected to the first liquid storage tank 3. The cooling air channel 12 is a cooling mechanism that cools the liquid L by supplying cooling air into the liquid L. The cooling air passage 12 has a cooling pipe 12A and an on-off valve 12B.

One end of the cooling pipe 12 </ b> A is disposed in the liquid L in the first liquid storage tank 3. The other end of the cooling pipe 12A is connected to a cooling air supply source (not shown).
The on-off valve 12B is attached in the cooling pipe 12A. The on-off valve 12B is opened when cooling air is supplied through the cooling pipe 12A. For example, a solenoid valve can be used as the on-off valve 12B.

The cooling air supplied into the liquid L in the first liquid storage tank 3 is supplied into the liquid L in the second liquid storage tank 4 through the second intake channel 13. That is, the cooling air supplied from the cooling air channel 12 cools the liquid L in the first liquid storage tank 3 and the liquid L in the second liquid storage tank 4.

<Second liquid storage tank>
The second liquid storage tank 4 is a device for cooling and purifying the combustion exhaust gas that has passed through the first liquid storage tank 3 again. That is, the carbon dioxide application device 1 cools and purifies the combustion exhaust gas in two stages.

  The second liquid storage tank 4 stores the same liquid L as the first liquid storage tank 3 inside. The second liquid storage tank 4 is configured to take in the combustion exhaust gas that has passed through the liquid L of the first liquid storage tank 3, and so that the captured combustion exhaust gas passes through the liquid L.

  Specifically, a second intake passage 13 is connected to the second liquid storage tank 4, and combustion exhaust gas is taken into the liquid L from the second intake passage 13. The combustion exhaust gas that has passed through the liquid L is supplied to the adsorption tank 6 through the supply channel 15. The second liquid storage tank 4 is provided with a plate (not shown) and a drainage path 17 similar to those of the first liquid storage tank 3. Note that the liquid L has entered the second intake flow path 13 to the same position as the liquid level in the second liquid storage tank 4.

  The supply flow path 15 is configured to supply the combustion exhaust gas that has passed through the liquid into the agricultural house or outside the agricultural house via the adsorption tank 6 on the downstream side of the liquid storage tank. The supply flow path 15 includes a first supply pipe 15 </ b> A, a second supply pipe 15 </ b> B, and a discharge flow path 16. One end of the first supply pipe 15 </ b> A is disposed in a space above the liquid level in the second liquid storage tank 4. The other end of the first supply pipe 15A is connected to a second supply pipe 15B and a later-described application pipe 14A.

<Blower>
The blower 5 is a device that is provided in the supply flow path 15 and configured to guide the combustion exhaust gas that has passed through the liquid in the first liquid storage tank 3 and the second liquid storage tank 4 to the downstream side of the liquid storage tank. . In the present embodiment, the blower 5 supplies the combustion exhaust gas to the adsorption tank 6, the agricultural house, and the agricultural house. The blower 5 is disposed in the second supply pipe 15 </ b> B of the supply flow path 15.

  In the carbon dioxide adsorption process, the operation of the blower 5 causes the first liquid storage tank 3 and the second liquid storage tank 4 to have negative pressure, and the combustion exhaust gas generated in the combustion device 2 is converted into the first liquid storage tank 3 and the second liquid storage tank 3. It is pumped to the adsorption tank 6 via the liquid storage tank 4.

<Adsorption tank>
In the adsorption tank 6, an adsorbent that adsorbs carbon dioxide in the combustion exhaust gas is disposed inside. In the carbon dioxide adsorption process, carbon dioxide in the combustion exhaust gas supplied by the blower 5 is adsorbed by the adsorbent. As the adsorbent, for example, a porous material such as activated carbon or zeolite can be used.

  On the other hand, in the carbon dioxide application step, application air is supplied from the application air flow path 14 into the adsorption tank 6, and carbon dioxide is desorbed from the adsorbent. The desorbed carbon dioxide is applied to the agricultural house through the discharge channel 16.

In the present embodiment, the application air channel 14 is connected to the supply channel 15. Specifically, the application air flow path 14 and the supply flow path 15 share the second supply pipe 15B. The application air flow path 14 includes an application pipe 14A and an on-off valve 14B.

  One end of the application pipe 14A is connected to the second supply pipe 15B. The other end of the application pipe 14A is open to the atmosphere. The on-off valve 14B is attached in the application pipe 14A. The on-off valve 14B is opened when supplying application air through the application pipe 14A. For example, a solenoid valve can be used as the on-off valve 14B.

  Since the inflow pressure of the application air flowing in from the application pipe 14 </ b> A is smaller than the pressure that pushes down the liquid surface of the second liquid storage tank 4, the application air is guided to the supply flow path 15.

<Control unit>
The control unit 7 is a device that controls the operation of the carbon dioxide application device 1. Specifically, the control unit 7 controls the operation and stop of the blower 5 and controls the opening and closing of the solenoid valve.

[1-2. effect]
According to the embodiment detailed above, the following effects can be obtained.
(1a) The liquid L sucked up with the combustion exhaust gas adheres to the plate 31 that closes the passage of the combustion exhaust gas, and is prevented from being discharged from the liquid storage tank to the blower 5 side. Further, the droplets adhering to the upper side of the plate 31 fall downward by the inclined surface 31A. Therefore, it is suppressed that a droplet stays on the plate 31 and is sucked up by the blower 5. As a result, the failure of the blower 5 due to the suction of the liquid L is suppressed. In addition, a decrease in the liquid in the liquid storage tank can be suppressed.

(1b) Since no through hole is formed in the plate 31, the suction of the liquid L by the blower 5 can be suppressed more reliably.
(1c) By using the plate 31 as the shielding part, it is possible to suppress the liquid suction by the blower 5 while ensuring the flow path of the combustion exhaust gas.

[2. Second Embodiment]
[2-1. Constitution]
FIG. 5 is a diagram illustrating the first liquid storage tank 3A in the carbon dioxide application device of the second embodiment. In the carbon dioxide application device of the second embodiment, the configuration other than the first liquid storage tank 3A is the same as that of the carbon dioxide application device 1 of FIG.

3 A of 1st liquid storage tanks are the structures similar to the 1st liquid storage tank 3 in the carbon dioxide application apparatus 1 of FIG. 1 except the structure of a shielding part.
In the present embodiment, the first liquid storage tank 3A has a plate 34 as a shielding part. The plate 34 is disposed vertically above the liquid level of the liquid L, and closes at least a part of the flow path of the combustion exhaust gas in the first liquid storage tank 3A.

  Specifically, the plate 34 is disposed at a position overlapping the discharge port 33 of the first liquid storage tank 3A in plan view. The end of the plate 34 is connected to the discharge port 33. That is, the plate 34 constitutes a part of the second intake channel 13 shown in FIG. In other words, this embodiment forms the shielding part by bending the end part of the second intake flow path 13 in the horizontal direction.

Similar to the plate 31 of FIG. 2, the plate 34 has an inclined upper surface, and drops droplets attached to the upper surface. Similar to the plate 31, the plate 34 is a flat disk in which no through hole is formed. The inclination angle of the plate 34 with respect to the horizontal direction is determined by the plate 31.
It is the same.

[2-2. effect]
According to the embodiment detailed above, the following effects can be obtained.
(2a) By configuring a part of the second intake flow path 13 (that is, the discharge port 33) as a shielding part, it is possible to suppress an increase in the number of parts for providing the shielding part.

[3. Other Embodiments]
As mentioned above, although embodiment of this indication was described, it cannot be overemphasized that this indication can take various forms, without being limited to the above-mentioned embodiment.

  (3a) In the carbon dioxide application device 1 of the above embodiment, the number of liquid storage tanks that store the liquid L may be one. Moreover, the carbon dioxide application apparatus 1 may be provided with three or more liquid storage tanks. In this case, you may provide a shielding part in all the liquid storage tanks. However, it is preferable to provide a shielding portion at least in the liquid storage tank arranged at the most downstream side (that is, closest to the blower 5).

  (3b) In the carbon dioxide application device 1 of the above embodiment, as shown in FIG. 6, a reserve tank 8 may be provided between the second liquid storage tank 4 and the blower 5 in the supply flow path 15. The reserve tank 8 stores the liquid L therein. The combustion exhaust gas discharged from the second liquid storage tank 4 is supplied from above the reserve tank 8, passes through the liquid L in the reserve tank 8, and is sucked into the blower 5. According to such a configuration, if the liquid L is sucked up from the second liquid storage tank 4 to the supply flow path 15, the liquid L can be collected by the spare tank 8.

  (3c) In the carbon dioxide application device 1 of the above embodiment, the plate 31 may be in contact with the inner surface of the liquid storage tank. Further, the planar shape of the plates 31 and 34 may be other than a circle.

  (3d) In the carbon dioxide application device 1 of the above embodiment, the shielding part is not limited to a plate as long as it has an inclined surface on the upper side. Therefore, you may use a block-shaped member as a shielding part.

  Moreover, the through-hole may be formed in the inclined surface of the shielding part. Further, the inclination angle of the inclined surface may not be constant. That is, the inclined surface may be bent or curved. Furthermore, the shielding part may have a plurality of inclined surfaces.

  (3e) In the carbon dioxide application device 1 of the above embodiment, the combustion exhaust gas that has passed through the liquid storage tank may be directly supplied into the agricultural house by the blower 5.

  (3f) The functions of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Moreover, you may abbreviate | omit a part of structure of the said embodiment. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

DESCRIPTION OF SYMBOLS 1 ... Carbon dioxide application apparatus, 2 ... Combustion apparatus, 3, 3A ... 1st liquid storage tank,
4 ... 2nd liquid storage tank, 5 ... Blower, 6 ... Adsorption tank, 7 ... Control part,
8 ... Reserve tank, 10 ... Exhaust gas passage, 11 ... First intake passage, 12 ... Cooling air passage,
12A ... Cooling piping, 12B ... Open / close valve, 13 ... Second intake passage, 14 ... Application air passage,
14A ... Application pipe, 14B ... Open / close valve, 15 ... Supply flow path, 15A ... First supply pipe,
15B ... 2nd supply piping, 16 ... discharge channel, 17 ... drainage channel, 17A ... check valve,
31 ... Plate, 31A ... Inclined surface, 32 ... Plate support, 33 ... Discharge port,
34 ... Plate.

Claims (4)

A carbon dioxide application device for supplying carbon dioxide contained in combustion exhaust gas into an agricultural house,
At least one liquid storage tank configured to store liquid and to allow combustion exhaust gas to pass through the liquid;
A supply flow path configured to supply the combustion exhaust gas that has passed through the liquid to the downstream side of the liquid storage tank;
A device that is provided in the supply flow path and guides the combustion exhaust gas that has passed through the liquid to the downstream side of the liquid storage tank;
With
The at least one liquid storage tank has a shielding portion arranged at a position above the liquid level in the vertical direction and at a position overlapping the exhaust port of the combustion exhaust gas in the at least one liquid storage tank as viewed from the vertical direction. And
The said shielding part is a carbon dioxide application apparatus which has the inclined surface which inclined with respect to the horizontal direction while facing the said discharge port. The carbon dioxide application device according to claim 1,
A carbon dioxide application device in which no through-hole is formed in the inclined surface. The carbon dioxide application device according to claim 1 or 2,
The at least one liquid storage tank has, as the shielding portion, a plate arranged so that a plate surface is inclined with respect to a horizontal direction,
The carbon dioxide application device, wherein the plate is disposed such that an inner surface of the at least one liquid storage tank is separated from at least a part thereof. The carbon dioxide application device according to claim 3,
When viewed from the vertical direction, the discharge port overlaps a portion of the plate that is positioned vertically below the center of gravity of the plate, and a portion of the plate that is positioned above the center of gravity of the plate in the vertical direction; Carbon dioxide application equipment that does not overlap.

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