JP6849563B2 - Carbon dioxide application device - Google Patents

Description

The present disclosure relates to a carbon dioxide application device.

Carbon dioxide application devices that apply carbon dioxide into agricultural greenhouses in order to improve the yield and quality of horticultural plants are known. On the other hand, the agricultural house is equipped with a warmer to prevent the temperature from dropping at night. The warmer burns heavy oil, kerosene, etc. and supplies warm air to the agricultural house.

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

In this carbon dioxide application device, the combustion exhaust gas is passed through the liquid in the liquid storage tank to be cooled, and then the carbon dioxide in the combustion exhaust gas is adsorbed by the adsorption tank. The liquid storage tank is provided with a drainage mechanism that operates by the pressure inside the liquid storage tank in order to keep the liquid level inside constant.

The carbon dioxide adsorbed in the adsorption tank is desorbed from the adsorption tank in the daytime and applied to the agricultural greenhouse.

Japanese Unexamined Patent Publication 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 into 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 sent to the agricultural house. A device (so-called aspirator) that guides the inside is provided. This aspirator is operated when carbon dioxide is adsorbed, and is stopped when the adsorption is stopped.

However, when the operation of the aspirator is stopped, the gas flows back into the liquid storage tank having a negative pressure from the downstream side of the aspirator, that is, the suction tank side, and the pressure in the liquid storage tank rises. As a result, the liquid is discharged from the drainage mechanism of the liquid storage tank, the liquid level in the liquid storage tank is lowered, and the normal liquid level cannot be maintained.

One aspect of the present disclosure is to provide a carbon dioxide application device capable of suppressing a decrease in the liquid level in a liquid storage tank when the adsorption of carbon dioxide is stopped.

One aspect of the present disclosure is a carbon dioxide application device that supplies carbon dioxide contained in combustion exhaust gas into an agricultural greenhouse. The carbon dioxide application device stores the liquid and supplies at least one liquid storage tank configured so that the combustion exhaust gas passes through the liquid and the combustion exhaust gas that has passed through the liquid to the downstream side of the liquid storage tank. A supply flow path configured in the above, a device provided in the supply flow path that guides the combustion exhaust gas that has passed through the liquid to the downstream side of the liquid storage tank, and an adjustment mechanism that adjusts the pressure in at least one liquid storage tank. , Equipped with. The adjusting mechanism is configured to suppress an increase in pressure in at least one liquid storage tank after the equipment is shut down.

According to such a configuration, the adjusting mechanism suppresses the pressure increase in the liquid storage tank after the operation of the device is stopped, so that the discharge of the liquid from the drainage mechanism is suppressed. As a result, it is possible to suppress a decrease in the liquid level in the liquid storage tank.

One aspect of the present disclosure may include, as the adjusting mechanism, a shutoff mechanism that shuts off the flow of gas from the device into at least one liquid storage tank. According to such a configuration, it is possible to easily and surely suppress an increase in pressure in the liquid storage tank after the operation of the equipment is stopped by a relatively simple configuration by opening and closing the regulating valve.

One aspect of the present disclosure may include, as an adjusting mechanism, an open flow path configured to open the gas in the supply flow path to the atmosphere. Even with such a configuration, it is possible to suppress the return of the gas to the inside of the liquid storage tank, so that it is possible to easily and surely suppress the increase in the pressure in the liquid storage tank after the operation of the device is stopped.

One aspect of the present disclosure may include, as an adjusting mechanism, a control unit configured to gradually stop the device. According to such a configuration, it is possible to easily and surely suppress an increase in pressure in the liquid storage tank after the operation of the device is stopped without increasing the number of parts constituting the device.

FIG. 1 is a block diagram schematically showing a configuration of a carbon dioxide application device according to an embodiment. FIG. 2 is a block diagram schematically showing a configuration of a carbon dioxide application device according to an embodiment different from that of FIG. FIG. 3 is a block diagram schematically showing a configuration of a carbon dioxide application device according to an embodiment different from that of FIGS. 1 and 2.

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

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, a control unit 7, and a regulating valve 8.
Further, the carbon dioxide application device 1 includes an exhaust gas flow path 10, a first intake flow path 11, a cooling air flow path 12, a second intake flow path 13, an application air flow path 14, and a supply flow path. It is provided with 15.

<Combustion device>
The combustion device 2 is a device that warms the air in an agricultural greenhouse by burning fuel such as heavy oil and kerosene mainly at night. The combustion exhaust gas is discharged to the outside of the agricultural greenhouse through the exhaust gas flow path 10 which is a chimney.

<1st 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.

The first liquid storage tank 3 stores the liquid L inside. Further, the first liquid storage tank 3 is configured to take in the combustion exhaust gas generated by the combustion device 2 so that the taken-in combustion exhaust gas passes through the liquid L. The combustion exhaust gas is cooled by heat exchange with the liquid L, and a part of the components contained in 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, the first intake flow path 11 is connected to the first liquid storage tank 3, and the combustion exhaust gas is supplied into the liquid L from the first intake flow path 11. The first intake flow path 11 is connected to the exhaust gas flow path 10 and takes in the combustion exhaust gas. The liquid L has entered the first intake flow path 11 to the same position as the liquid level in the first liquid storage tank 3.

In FIG. 1, the end of the first intake flow path 11 is connected to the lower surface of the first liquid storage tank 3, but the end of the first intake flow path 11 is the first liquid storage tank 3. It may be connected to the side surface of. Further, the first intake flow path 11 may be arranged 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 flow path 13 of the second liquid storage tank 4, which will be described later.

The combustion exhaust gas supplied into the liquid L floats in the liquid L as bubbles. 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 flow path 13.

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

Further, the first liquid storage tank 3 is provided with a drainage channel 17. The drainage channel 17 is a flow path 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 the 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. The check valve 17A does not necessarily have to be provided in the drainage channel 17 as long as the liquid L can be discharged as the liquid level rises.

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

One end of the cooling pipe 12A is arranged in the liquid L in the first liquid storage tank 3. The other end of the cooling pipe 12A is connected to a source of cooling air (not shown).
The on-off valve 12B is installed in the cooling pipe 12A. The on-off valve 12B is opened when the cooling air is supplied by the cooling pipe 12A. As the on-off valve 12B, for example, a solenoid valve can be used.

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 by the second intake flow path 13. That is, the cooling air supplied from the cooling air flow path 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. Further, the second liquid storage tank 4 is configured to take in the combustion exhaust gas that has passed through the first liquid storage tank 3 so that the taken-in combustion exhaust gas passes through the liquid L.

Specifically, the second intake flow path 13 is connected to the second liquid storage tank 4, and the combustion exhaust gas is supplied into the liquid L from the second intake flow path 13. The combustion exhaust gas that has passed through the liquid L is supplied to the adsorption tank 6 by the supply flow path 15. The second liquid storage tank 4 is provided with a drainage channel 17 similar to that of the first liquid storage tank 3. 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 to the inside of the agricultural greenhouse or the outside of the agricultural greenhouse via the adsorption tank 6 on the downstream side of the liquid storage tank. The supply flow path 15 includes a first supply pipe 15A, a second supply pipe 15B, and a discharge flow path 16. One end of the first supply pipe 15A is arranged 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 the second supply pipe 15B and the application pipe 14A described later.

<Blower>
The blower 5 is a device provided in the supply flow path 15 and configured to guide the combustion exhaust gas that has passed through the liquids of 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 inside of the agricultural greenhouse, and the outside of the agricultural greenhouse. The blower 5 is arranged in the second supply pipe 15B of the supply flow path 15.

In the carbon dioxide adsorption step, the operation of the blower 5 creates a negative pressure in the first liquid storage tank 3 and the second liquid storage tank 4, and the combustion exhaust gas generated in the combustion device 2 becomes 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.

<Suction tank>
In the adsorption tank 6, an adsorbent that adsorbs carbon dioxide in the combustion exhaust gas is arranged inside. In the carbon dioxide adsorption step, the 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, the application air is supplied into the adsorption tank 6 from the application air flow path 14, and the carbon dioxide is desorbed from the adsorbent. The desorbed carbon dioxide is applied to the agricultural greenhouse via the discharge channel 16.

In this embodiment, the application air flow path 14 is connected to the supply flow path 15. Specifically, the application air flow path 14 and the supply flow path 15 share the second supply pipe 15B. Further, the application air flow path 14 has 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 installed in the application pipe 14A. The on-off valve 14B is opened when the application air is supplied by the application pipe 14A. As the on-off valve 14B, for example, a solenoid valve can be used.

Since the inflow pressure of the application air flowing in from the application pipe 14A is smaller than the pressure pushing down the liquid level 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, the opening and closing of the solenoid valve, and the like.

<Adjustment mechanism>
In the present embodiment, the carbon dioxide application device 1 includes a regulating valve 8 as a regulating mechanism for adjusting the pressure in the first liquid storage tank 3 and the second liquid storage tank 4.

The regulating valve 8 is a shutoff mechanism that shuts off the flow of gas from the blower 5 (that is, the adsorption tank 6) into the second liquid storage tank 4 after the operation of the blower 5 is stopped. The regulating valve 8 suppresses an increase in pressure in the first liquid storage tank 3 and the second liquid storage tank 4 after the operation of the blower 5 is stopped.

The regulating valve 8 is arranged on the upstream side in the flow direction of the combustion exhaust gas with respect to the adsorption tank 6 in the supply flow path 15. In the present embodiment, the regulating valve 8 is arranged on the upstream side of the blower 5 in the supply flow path 15.

As the adjusting valve 8, for example, a check valve can be used. Further, a gate valve, a globe valve, a ball valve, or the like is used as the adjusting valve 8, the adjusting valve 8 is opened in the carbon dioxide adsorption step, and the adjusting valve 8 is closed manually or by the control unit 7 after the operation of the blower 5 is stopped. It may be configured as follows. However, by using the adjusting valve 8 as a check valve, the configuration of the adjusting mechanism can be simplified and the cost can be reduced.

[1-2. effect]
According to the embodiment described in detail above, the following effects can be obtained.
(1a) By closing the regulating valve 8, the pressure rise in the first liquid storage tank 3 and the second liquid storage tank 4 is suppressed after the operation of the blower 5 is stopped, so that the liquid L is discharged from the drainage channel 17. It is suppressed. As a result, the decrease in the liquid level of the liquid L can be suppressed.

(1b) When the carbon dioxide adsorption process is restarted (that is, when the blower 5 is restarted) after the blower 5 is stopped by the regulating valve 8, gas flows back from the adsorption tank 6 side to the second liquid storage tank 4. Is suppressed.

[2. Second Embodiment]
[2-1. Constitution]
The carbon dioxide application device 21 shown in FIG. 2 is a device for recovering carbon dioxide contained in combustion exhaust gas and supplying it into an agricultural greenhouse.

The carbon dioxide application device 21 includes a combustion device 2, a first liquid storage tank 3, a second liquid storage tank 4, a blower 5, an adsorption tank 6, a control unit 7, and an open flow path 9. In the carbon dioxide application device 21 of FIG. 2, the same components as those of the carbon dioxide application device 1 of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

<Open flow path>
In the present embodiment, the carbon dioxide application device 21 includes an open flow path 9 as an adjusting mechanism for adjusting the pressure in the first liquid storage tank 3 and the second liquid storage tank 4.

The open flow path 9 is configured so that the gas in the supply flow path 15 can be opened to the atmosphere. The open flow path 9 suppresses an increase in pressure in the first liquid storage tank 3 and the second liquid storage tank 4 after the operation of the blower 5 is stopped.

The open flow path 9 is connected to the supply flow path 15 at a position upstream of the adsorption tank 6 in the flow direction of the combustion exhaust gas. In the present embodiment, the open flow path 9 is connected to a position on the upstream side of the blower 5 of the supply flow path 15. Further, the gas release destination in the open flow path 9 may be inside or outside the agricultural greenhouse.

The open flow path 9 may have, for example, a pipe connected to the supply flow path 15 and a relief valve attached to the pipe. Further, in the open flow path 9, for example, an on-off valve such as a gate valve, a globe valve, or a ball valve is attached to a pipe connected to the supply flow path 15, and the on-off valve is closed in the carbon dioxide adsorption step, and the blower 5 is used. The on-off valve may be opened manually or by the control unit 7 after the operation is stopped. Further, the application air flow path 14 can be used as the open flow path 9. Note that in FIG. 2, the illustration of a valve such as a relief valve is omitted.

[2-2. effect]
According to the embodiment described in detail above, the following effects can be obtained.
(2a) The open flow path 9 prevents the gas from returning to the second liquid storage tank 4 after the operation of the blower 5 is stopped. Therefore, the pressure increase in the first liquid storage tank 3 and the second liquid storage tank 4 after the operation of the blower 5 is stopped is suppressed, and the liquid level drop of the liquid L can be suppressed.

[3. Third Embodiment]
[3-1. Constitution]
The carbon dioxide application device 31 shown in FIG. 3 is a device for recovering carbon dioxide contained in combustion exhaust gas and supplying it into an agricultural greenhouse.

The carbon dioxide application device 31 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. In the carbon dioxide application device 31 of FIG. 3, the same components as those of the carbon dioxide application device 1 of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

<Control unit>
In the present embodiment, the carbon dioxide application device 31 includes a control unit 7 as an adjusting mechanism for adjusting the pressure in the first liquid storage tank 3 and the second liquid storage tank 4.

The control unit 7 is configured to gradually stop the blower 5. That is, the control unit 7 controls to gradually reduce the rotation of the blower 5 when the operation of the blower 5 is stopped. Specifically, the control unit 7 gradually reduces the rotation speed of the blower 5 so that the pressure on the downstream side is always larger than the pressure in the second liquid storage tank 4 on the upstream side with respect to the blower 5. When the suction is stopped, the on-off valve 16A of the discharge flow path 16 is opened, and the pressure in the suction tank 6 gradually decreases.

[3-2. effect]
According to the embodiment described in detail above, the following effects can be obtained.
(3a) By controlling the blower 5 by the control unit 7, the first liquid storage tank 3 and the second liquid after the operation of the blower 5 is stopped can be easily and surely without increasing the number of parts constituting the carbon dioxide application device 31. It is possible to suppress an increase in pressure in the storage tank 4.

[4. Other embodiments]
Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take various forms.

(4a) In the carbon dioxide application devices 1, 21, 31 of the above embodiment, the number of liquid storage tanks for storing the liquid L may be one. In addition, the carbon dioxide application device may include three or more liquid storage tanks.

(4b) In the carbon dioxide application device 31 of the above embodiment, the control unit 7 may control the opening degree of the on-off valve 16A of the discharge flow path 16 in addition to controlling the rotation speed of the blower 5. That is, the on-off valve 16A may be controlled to be gradually opened so that the pressure on the downstream side of the blower 5 is always larger than the pressure in the suction tank 6.

(4c) In the carbon dioxide application devices 1, 21, 31 of the above embodiment, the combustion exhaust gas that has passed through the liquid storage tank may be directly supplied into the agricultural greenhouse by the blower 5.

(4d) The functions of one component in the above embodiment may be dispersed as a plurality of components, or the functions of the plurality of components may be integrated into one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other embodiment. It should be noted that all aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

1,21,31 ... Carbon dioxide application device, 2 ... Combustion device, 3 ... First liquid storage tank,
4 ... 2nd liquid storage tank, 5 ... Blower, 6 ... Suction tank, 7 ... Control unit, 8 ... Adjusting valve 9 ... Open flow path, 10 ... Exhaust gas flow path, 11 ... 1st intake flow path, 12 ... Cooling Air flow path,
12A ... cooling pipe, 12B ... on-off valve, 13 ... second intake flow path, 14 ... application air flow path,
14A ... Application piping, 14B ... On-off valve, 15 ... Supply flow path, 15A ... First supply piping,
15B ... 2nd supply pipe, 16 ... Discharge flow path, 16A ... On-off valve, 17 ... Drainage channel,
17A ... Check valve.

Claims (3)

A carbon dioxide application device that supplies carbon dioxide contained in combustion exhaust gas to an agricultural greenhouse.
At least one liquid storage tank configured to store the liquid and allow the flue 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, and
A device provided in the supply flow path and guiding the combustion exhaust gas that has passed through the liquid to the downstream side of the liquid storage tank.
A shutoff mechanism that shuts off the flow of gas from the device into the at least one liquid storage tank .
With
The shutoff mechanism is a carbon dioxide application device configured to suppress an increase in pressure in the at least one liquid storage tank after the equipment is shut down. A carbon dioxide application device that supplies carbon dioxide contained in combustion exhaust gas to an agricultural greenhouse.
At least one liquid storage tank configured to store the liquid and allow the flue 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, and
A device provided in the supply flow path and guiding the combustion exhaust gas that has passed through the liquid to the downstream side of the liquid storage tank.
An open flow path of the gas before Symbol supply passage configured to be opened to the atmosphere
With
The open flow path is a carbon dioxide application device configured to suppress an increase in pressure in the at least one liquid storage tank after the equipment is shut down. A carbon dioxide application device that supplies carbon dioxide contained in combustion exhaust gas to an agricultural greenhouse.
At least one liquid storage tank configured to store the liquid and allow the flue 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, and
A device provided in the supply flow path and guiding the combustion exhaust gas that has passed through the liquid to the downstream side of the liquid storage tank.
A control unit configured to pre-Symbol device gradually to stop,
With
The control unit is a carbon dioxide application device configured to suppress an increase in pressure in the at least one liquid storage tank after the operation of the device is stopped.

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