JP6763839B2 - Carbon dioxide application device - Google Patents

Description

The present disclosure relates to a carbon dioxide application device.

A carbon dioxide application device for applying carbon dioxide into an agricultural house in order to improve the yield and quality of horticultural plants is 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 house 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 carbon dioxide adsorbed in the adsorption tank is, for example, desorbed from the adsorption tank in the daytime and applied to the agricultural house.

Japanese Unexamined Patent Publication No. 2015-142531

In the carbon dioxide application device, the temperature of the liquid in the liquid storage tank rises due to heat exchange with the combustion exhaust gas. Therefore, it is necessary to appropriately cool the liquid in the liquid storage tank. As a method for cooling the liquid, a method of supplying low-temperature cooling air to the liquid is used.

By the way, in the carbon dioxide application device, a plurality of liquid storage tanks may be provided in series in order to ensure cooling of the combustion exhaust gas. In this case, if each liquid storage tank is provided with a cooling air supply mechanism, the structure of the device becomes complicated. Therefore, the structure can be simplified by supplying the cooling air only to the liquid in the upstream liquid storage tank and supplying the cooling air that has passed through the upstream liquid storage tank to the downstream liquid storage tank.

However, since the temperature of the cooling air that has passed through the upstream liquid storage tank rises due to heat exchange with the liquid in the upstream liquid storage tank, the cooling effect of the liquid in the downstream liquid storage tank becomes insufficient. As a result, the liquid in the downstream liquid storage tank is not cooled until the temperature of the liquid in the upstream liquid storage tank is lowered, so that the time required for cooling is increased.

One aspect of the present disclosure is to provide a carbon dioxide application device capable of rapidly cooling liquids in a plurality of liquid storage tanks with a simple structure.

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 stored the liquid and passed through the first liquid storage tank and the second liquid storage tank, which were configured so that the combustion exhaust gas passed through the liquid, and the liquid in the first liquid storage tank, respectively. A take-in flow path for taking in the combustion exhaust gas into the second liquid storage tank, a supply flow path configured to supply the combustion exhaust gas passing through the liquid to the downstream side of the liquid storage tank, and a inside of the first liquid storage tank. It is provided with a cooling air flow path for supplying cooling air to the liquid. The cooling air flow path is from the main cooling flow path that discharges the cooling air into the liquid in the first liquid storage tank and the intake flow path from the main cooling flow path without passing through the liquid in the first liquid storage tank. Includes a bypass flow path for transferring cooling air.

According to such a configuration, the bypass flow path allows a part of the cooling air to directly flow to the liquid in the second liquid storage tank on the downstream side without passing through the liquid in the first liquid storage tank on the upstream side. Can be supplied. As a result, the liquid in the first liquid storage tank and the liquid in the second liquid storage tank can be cooled at the same time by one cooling air flow path, and the cooling time of the liquid in these liquid storage tanks can be shortened.

In one aspect of the present disclosure, the cooling air flow path may have a cooling pipe whose end is located in the liquid in the first liquid storage tank. Further, the cooling pipe may have a through hole communicating with the space above the liquid level of the first liquid storage tank. According to such a configuration, since the bypass flow path can be formed by the through hole provided in the cooling pipe, it is not necessary to provide a new pipe or valve for forming the bypass flow path.

In one aspect of the present disclosure, the diameter of the through hole may be less than the inner diameter of the cooling pipe. According to such a configuration, the amount of cooling air supplied to the liquid in the first liquid storage tank is suppressed from being excessively reduced, so that the liquid in the first liquid storage tank and the second liquid storage tank are suppressed. The liquid inside can be cooled more reliably.

In one aspect of the present disclosure, the diameter of the through hole may be 10% or more of the inner diameter of the cooling pipe. According to such a configuration, the amount of cooling air supplied to the liquid in the second liquid storage tank by bypassing the first liquid storage tank is secured, so that the liquid in the first liquid storage tank and the second liquid are secured. The liquid in the liquid storage tank can be cooled more quickly.

FIG. 1 is a block diagram schematically showing a configuration of a carbon dioxide application device according to an embodiment. FIG. 2 is a graph showing the relationship between the diameter of the through hole and the ratio of the bypass flow rate.

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 house. The carbon dioxide application device 1 is arranged 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 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 the agricultural house by burning fuel such as heavy oil and kerosene mainly at night. The combustion exhaust gas is discharged to the outside of the agricultural house 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, it is preferable that the liquid L 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.

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). Further, the cooling pipe 12A has a through hole 12C.

The through hole 12C communicates with the space (hereinafter, also referred to as “upper space”) S above the liquid level of the first liquid storage tank 3. That is, the through hole 12C is provided between the upper surface of the first liquid storage tank 3 and the liquid level in the cooling pipe 12A.

The cooling pipe 12A constitutes a main cooling flow path that discharges cooling air into the liquid L in the first liquid storage tank 3. On the other hand, a part of the cooling air flowing in the cooling pipe 12A is discharged into the upper space S of the first liquid storage tank 3 by the through hole 12C, and further into the second liquid storage tank 4 by the second intake flow path 13. It is captured. That is, the through hole 12C and the upper space S constitute a bypass flow path for transferring cooling air from the main cooling flow path to the second intake flow path 13 without passing through the liquid L in the first liquid storage tank 3. Has been done.

As described above, the cooling air flow path 12 includes the main cooling flow path and the bypass flow path. Therefore, a part of the cooling air flowing through the cooling air flow path 12 is directly supplied to the liquid L in the second liquid storage tank 4 by the bypass flow path without cooling the liquid L in the first liquid storage tank 3. Will be done. The rest of the cooling air flowing through the cooling air flow path 12 cools the liquid L in the first liquid storage tank 3 and then passes through the upper space S into the second liquid storage tank 4 by the second intake flow path 13. Is supplied to the liquid L of.

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 size of the through hole 12C is the flow rate of air supplied to the liquid L in the first liquid storage tank 3 by the main cooling flow path and the flow rate of air passing through the bypass flow path (hereinafter, also referred to as "bypass flow rate"). It is appropriately designed based on the ratio of.) And. The ratio of these flow rates is determined by, for example, the temperature and storage amount of the liquid L in each liquid storage tank, the temperature of the cooling air, and the like. The ratio of the bypass flow rate to the total flow rate of the cooling air is preferably, for example, 10% or more and 20% or less.

The size of the through hole 12C is determined by the above-mentioned flow rate ratio, the diameter of the cooling pipe 12A, the distance between the end of the cooling pipe 12A and the liquid level of the liquid L (that is, the insertion amount of the cooling pipe 12A) D and the like. Determined based on.

Since the combustion exhaust gas having a higher temperature than that of the second liquid storage tank 4 on the downstream side is supplied to the first liquid storage tank 3 on the upstream side, the temperature of the liquid L in the first liquid storage tank 3 is the temperature of the second liquid storage tank 3. It becomes higher than the temperature of the liquid L in the tank 4. Therefore, the flow rate of the cooling air in the main cooling flow path needs to be larger than the flow rate of the cooling air in the bypass flow path. Therefore, the diameter of the through hole 12C may be smaller than the inner diameter of the cooling pipe 12A. Further, the diameter of the through hole 12C is preferably 10% or more of the inner diameter of the cooling pipe 12A.

More specifically, the upper limit of the diameter of the through hole 12C is preferably 20 mm, more preferably 13 mm. On the other hand, as the lower limit of the diameter of the through hole 12C, 5 mm is preferable, and 8 mm is more preferable.

If the diameter of the through hole 12C is too large, the bypass flow rate becomes excessively large, and the cooling of the liquid L in the first liquid storage tank 3 may be insufficient. On the contrary, if the diameter of the through hole 12C is too small, it becomes difficult for the cooling air to pass through the bypass flow path, and the cooling rate of the liquid L in the second liquid storage tank 4 may decrease.

Hereinafter, the results of a test confirming the relationship between the size of the diameter of the through hole 12C and the flow rate of the cooling air flowing through the bypass flow path formed by the through hole 12C (that is, the bypass flow rate) will be described.

In this test, the air that flowed directly into the second intake flow path 13 without passing through the liquid L in the first liquid storage tank 3 while changing the size of the through hole 12C formed in the cooling pipe 12A. Bypass flow rate was measured. The inner diameter of the cooling pipe 12A was 35.7 mm, and the amount D of the cooling pipe 12A inserted into the liquid L in the first liquid storage tank 3 was 70 mm.

The result is shown in FIG. In the graph of FIG. 2, the horizontal axis is the ratio of the diameter of the through hole 12C to the inner diameter of the cooling pipe 12A, and the vertical axis is the ratio of the bypass flow rate to the total flow rate of the cooling air. As can be seen from FIG. 2, the bypass flow rate increases as the diameter of the through hole 12C increases. The shaded area shown in FIG. 2 (that is, 30% or more and 50% or less of the inner diameter of the cooling pipe) is the region where the bypass flow rate ratio is optimal.

<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 liquid L of the first liquid storage tank 3 and allow the taken-in combustion exhaust gas to pass 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 taken 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 house or the outside of 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 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 provided in the supply flow path 15 and is 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 (that is,). Aspirator). In the present embodiment, the blower 5 supplies the combustion exhaust gas to the adsorption tank 6, the inside of the agricultural house, and the outside of the agricultural house. 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 house 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 for 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.

[1-2. effect]
According to the embodiment described in detail above, the following effects can be obtained.
(1a) A part of the cooling air is directly supplied to the liquid L in the second liquid storage tank 4 on the downstream side by the bypass flow path without passing through the liquid L in the first liquid storage tank 3 on the upstream side. can do. As a result, the liquid L in the first liquid storage tank 3 and the liquid L in the second liquid storage tank 4 are simultaneously cooled by one cooling air flow path 12, and the cooling time of the liquid L in these liquid storage tanks is reduced. Can be shortened.

(1b) Since the bypass flow path can be configured by the through hole 12C provided in the cooling pipe 12A, it is not necessary to provide a new pipe or valve for forming the bypass flow path in the carbon dioxide application device 1.

[2. 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 various forms can be adopted.

(2a) The carbon dioxide application device 1 of the above embodiment may include three or more liquid storage tanks arranged in series. That is, a liquid storage tank may be further provided downstream of the second liquid storage tank 4.

(2b) In the carbon dioxide application device 1 of the above embodiment, an auxiliary pipe may be connected to the through hole 12C of the cooling pipe 12A. One end of this auxiliary pipe is connected to the through hole 12C, and the other end is arranged in a space above the liquid level of the first liquid storage tank 3.

(2c) In the carbon dioxide application device 1 of the above embodiment, the bypass flow path does not necessarily have to be formed by the through hole 12C. For example, instead of the through hole 12C, an auxiliary pipe connecting the main cooling flow path (that is, the cooling pipe 12A) and the second intake flow path 13 is provided as a bypass flow path outside the first liquid storage tank 3. May be good. One end of this auxiliary pipe is connected to a portion of the cooling pipe 12A located outside the first liquid storage tank 3, and the other end is connected to the second intake flow path 13.

(2d) 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.

(2e) 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 ... carbon dioxide application device, 2 ... combustion device, 3 ... first liquid storage tank,
4 ... 2nd liquid storage tank, 5 ... blower, 6 ... adsorption tank, 7 ... control unit,
10 ... Exhaust gas flow path, 11 ... First intake flow path, 12 ... Cooling air flow path, 12A ... Cooling pipe,
12B ... On-off valve, 12C ... Through hole, 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, 17 ... Drainage channel, 17A ... Check valve.

Claims (4)

A carbon dioxide application device that supplies carbon dioxide contained in combustion exhaust gas to an agricultural house.
A first liquid storage tank and a second liquid storage tank configured to store a liquid and allow combustion exhaust gas to pass through the liquid, respectively.
A take-in flow path for taking in the combustion exhaust gas that has passed through the liquid in the first liquid storage tank into the second liquid storage tank, and
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 cooling air flow path that supplies cooling air to the liquid in the first liquid storage tank,
With
The cooling air flow path is
A main cooling flow path that discharges cooling air into the liquid in the first liquid storage tank,
A bypass flow path for transferring cooling air from the main cooling flow path to the intake flow path without passing through the liquid in the first liquid storage tank.
Carbon dioxide application equipment, including. The carbon dioxide application device according to claim 1.
The cooling air flow path has a cooling pipe whose end is arranged in the liquid in the first liquid storage tank.
The cooling pipe, the the liquid level of the first liquid storage tank in communication with the upper space, a through hole constituting the bypass passage, carbon dioxide application device. The carbon dioxide application device according to claim 2.
A carbon dioxide application device in which the diameter of the through hole is smaller than the inner diameter of the cooling pipe. The carbon dioxide application device according to claim 3.
A carbon dioxide application device in which the diameter of the through hole is 10% or more of the inner diameter of the cooling pipe.

Images