Carbon dioxide applying apparatus

Abstract

To provide a carbon dioxide applying apparatus constituted to apply carbon dioxide into an agricultural greenhouse in which a combustion state in a combustion part can be maintained in a good condition while reducing environmental load.SOLUTION: A carbon dioxide applying apparatus comprises a combustion part, piping, an air introducing part, a blower, and a discharge valve. The combustion part is constituted so as to introduce air for combustion, burn woody fuel, and generate combustion exhaust gas. The air introducing part is constituted so as to introduce air for diluting combustion exhaust gas. The blower is constituted so as to send out combustion exhaust gas to an agricultural greenhouse. The discharge valve is constituted to be capable of changing a flow channel of combustion exhaust gas between the air introducing part side and the agricultural greenhouse side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a technique for applying carbon dioxide inside an agricultural greenhouse. [Background technology]

[0002] For example, Patent Document 1 below discloses a technique for applying carbon dioxide generated by burning fossil fuels such as heavy oil to an agricultural greenhouse. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6266989 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology of Patent Document 1 has a problem that it has a large environmental impact because it burns fossil fuels. In addition, the technology that uses carbon dioxide requires maintaining a good combustion state in the combustion section.

[0005] One aspect of the present disclosure is to provide a carbon dioxide application device configured to apply carbon dioxide inside an agricultural greenhouse, which is capable of maintaining good combustion conditions in a combustion section while reducing the environmental load. [Means for solving the problem]

[0006] One aspect of the present disclosure is a carbon dioxide application device comprising a combustion section, a pipe, an air introduction section, a blower, and an exhaust valve. The combustion section is configured to introduce air for combustion and burn wood fuel to generate combustion exhaust gas. The pipe configures a flow path of the combustion exhaust gas from the combustion section to an agricultural house. The air introduction section is configured to introduce air for diluting the combustion exhaust gas in the pipe. The blower is disposed in the pipe and configured to send the combustion exhaust gas generated in the combustion section to the agricultural house. The exhaust valve is disposed in the pipe and configured to be able to change the flow path of the combustion exhaust gas between the air introduction section side and the agricultural house side. With this configuration, the flow rate of air supplied to the combustion section and the flow rate of air introduced from the air inlet for dilution can be adjusted by operating the exhaust valve, so that good combustion conditions in the combustion section can be maintained.

[0007] In one aspect of the present disclosure, the piping may include a recirculation pipe, located on the agricultural house side of the blower, for returning at least a portion of the combustion exhaust gas to the combustion section. According to this configuration, the combustion state in the combustion section can be adjusted by the air blown from the blower.

[0008] An aspect of the present disclosure may further include a recirculation valve disposed in the recirculation pipe and configured to adjust a flow rate in the recirculation pipe. According to this configuration, the flow rate of the combustion exhaust gas returned to the combustion section through the recirculation pipe can be adjusted by using the recirculation valve, so that the combustion state in the combustion section can be well adjusted.

[0009] In one aspect of the present disclosure, the piping may further include a purification section configured to store an alkaline solution between the air inlet section and the blower, and to pass the combustion exhaust gas generated in the combustion section through the alkaline solution. The purification section may have a drainage channel. The drain is a component for adjusting the water level. The drainage channel functions as both the drain and the air inlet section. According to such a configuration, the drainage channel provided in the purification section as a drain can also be used as the air introduction section. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a block diagram showing the configuration of a carbon dioxide application device. [Diagram 2] FIG. 4 is a side view showing the configuration of the intake pipe. [Diagram 3] FIG. 2 is a side cross-sectional view showing a schematic configuration of a combustion section. [Figure 4] FIG. 2 is a side cross-sectional view showing a schematic configuration of a purification section. [Diagram 5] 1 is a flow chart of a method of operating a carbon dioxide application device. [Figure 6] FIG. 11 is a block diagram showing the configuration of a carbon dioxide application device in a first modified example. [Figure 7] FIG. 7A is a side cross-sectional view showing a schematic configuration of a combustion section in a second modified example, and FIG. 7B is a side cross-sectional view showing a schematic configuration of a combustion section in a third modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. Embodiment] [1-1. Configuration] <Summary> The carbon dioxide application device 1A shown in Fig. 1 is a device for burning wood-based fuel and applying carbon dioxide contained in the combustion exhaust gas to an agricultural greenhouse. The carbon dioxide application device 1A is arranged with its components dispersed inside and outside the agricultural greenhouse, as described below.

[0012] The carbon dioxide application device 1A includes a combustion section 3A and a purification section 5. The carbon dioxide application device 1A may include a blower 7. In addition, the carbon dioxide application device 1A may include various pipes 11, 12, 13, 14, 16, and 17 (hereinafter, 11 to 17). In addition, the carbon dioxide application device 1A may include any one of various valves 21, 22, and 23 (hereinafter, 21 to 23). The various valves 21 to 23 may be opened and closed by an operator, or may be controlled to open and close by an actuator.

[0013] <Various pipes 11-17 and various valves 21-23> The carbon dioxide application device 1A includes various pipes 11-17, such as an exhaust pipe 11, an intake pipe 12, a decompression pipe 13, a pressurization pipe 14, an application pipe 16, and a recirculation pipe 17. The carbon dioxide application device 1A includes various valves 21-23, such as an exhaust valve 21, an application valve 22, and a recirculation valve 23. The various pipes 11-17 are formed in a hollow tubular shape and function as flow paths for applying the combustion exhaust gas to an agricultural greenhouse.

[0014] The exhaust pipe 11 is a pipe extending vertically upward from the combustion section 3A. The exhaust pipe 11 is connected to the inlet and outlet section 28. The inlet and outlet section 28 has a cross section cut in the vertical direction that is formed into a substantially H-shape, with the top and bottom of the H-shape being open, and functions as a chimney. That is, the inlet and outlet section 28 has four openings 28A configured to communicate the inside of the inlet and outlet section 28 with the atmosphere, and can exhaust the combustion exhaust gas into the atmosphere from the four openings 28A.

[0015] The inlet / outlet section 28 also functions as an air inlet section, which is a section for introducing air from outside the agricultural greenhouse to dilute the combustion exhaust gas. In this case, air is sucked in from the four openings 28A, and the combustion exhaust gas is mixed with the air in the exhaust pipe 11, so that the combustion exhaust gas is diluted and cooled. The diluted combustion exhaust gas is then introduced into the intake pipe 12. In this way, the carbon dioxide application device 1A can control the carbon dioxide concentration to an appropriate value by appropriately mixing the combustion exhaust gas and air and applying it.

[0016] The intake pipe 12 is a pipe that branches off from the discharge pipe 11 and connects the discharge pipe 11 to the purification section 5. A discharge valve 21 is disposed in the discharge pipe 11 at the point where it branches off from the intake pipe 12. The intake pipe 12 is configured by combining a straight pipe and a curved pipe having roughly the same inner diameter, or by bending a straight pipe as necessary.

[0017] The exhaust valve 21 can be switched between a communication state, a cutoff state, and an intermediate state between them. The communication state is a state in which the combustion section 3A and the introduction and discharge section 28 are communicated with each other via the exhaust pipe 11, and the combustion section 3A and the intake pipe 12 are also communicated with each other via the exhaust pipe 11. The cutoff state is a state in which the combustion section 3A and the introduction and discharge section 28 are generally cut off from each other, and the combustion section 3A and the intake pipe 12 are communicated with each other. The intermediate state is a state between the communication state and the cutoff state, and is a state in which the flow rate of gas moving between the combustion section 3A and the introduction and discharge section 28 is controlled according to the opening degree of the exhaust valve 21.

[0018] The lower portion of the combustion section 3A is partially opened, and air required for combustion is introduced into the combustion section 3A through this opening. Here, in Fig. 1 and the like, the configuration of the intake pipe 12 is depicted simply, but in detail, the intake pipe 12 is configured as shown in Fig. 2, for example. That is, the intake pipe 12 includes a plurality of straight pipe sections 12A, a plurality of curved pipe sections 12B, a plurality of connection sections 12C, a vertical pipe section 12D, a plurality of lower bent sections 12E, and a lower horizontal section 12F.

[0019] The straight pipe sections 12A are sections that extend linearly in the horizontal direction. The curved pipe sections 12B are sections where the pipe is bent so that the internal space of the straight pipe sections 12A communicates with the straight pipe sections 12A and the direction of the flow path of the combustion exhaust gas turns 90 degrees. The radius of curvature of the curved pipe sections 12B is set to be sufficiently smaller than the radius of curvature of the straight pipe sections 12A. The connecting sections 12C are sections that extend linearly in the vertical direction and are arranged to connect the connecting sections 12C together.

[0020] The vertical pipe section 12D is the section of the intake pipe 12 on the purification section 5 side, and extends vertically. The multiple lower bends 12E are sections where the pipe is bent below the purification section 5. The lower horizontal section 12F is disposed so as to connect between the multiple lower bends 12E. As will be described later, liquid L is stored in the purification section 5. This liquid L is also stored in a part of the vertical pipe section 12D, the multiple lower bends 12E, and the lower horizontal section 12F.

[0021] With this configuration, the intake pipe 12 is configured to have a longer piping length than when the exhaust pipe 11 and the purification unit 5 are connected linearly. Since the intake pipe 12 has multiple bent pipe sections 12B, the flow rate in the intake pipe 12 is faster outside the multiple bent pipe sections 12B, and the outside of the multiple bent pipe sections 12B becomes hotter. Therefore, heat exchange between the combustion exhaust gas and the atmosphere is promoted outside the multiple bent pipe sections 12B compared to a configuration that does not have multiple bent pipe sections 12B. In addition, since the intake pipe 12 has a longer piping length and a larger surface area than when the intake pipe 12 connects the exhaust pipe 11 and the purification unit 5 linearly, heat exchange between the combustion exhaust gas in the pipe and the atmosphere is promoted. Therefore, the combustion exhaust gas can be cooled more effectively.

[0022] An application valve 22 is disposed in the intake pipe 12. The amount of combustion exhaust gas and air introduced from the intake pipe 12 can be controlled according to the opening degree of the application valve 22. In addition, when a drainage channel 54 provided in the purification section 5 described later functions as an air introduction section, the balance between the amount of air introduced from the drainage channel 54 and the amount of air introduced from the intake pipe 12 can be adjusted according to the opening degree of the application valve 22.

[0023] The decompression pipe 13 is a pipe that connects the purification section 5 and the blower 7. The decompression pipe 13 becomes negative pressure (i.e., the air pressure is lower than atmospheric pressure) when the blower 7 is operated. The pressurization pipe 14 is a pipe that connects the blower 7 and the branching section 15. The pressurization pipe 14 becomes positive pressure (i.e., the air pressure is higher than atmospheric pressure) when the blower 7 is operated. The branching section 15 is a section for distributing the gas flowing in from the pressurization pipe 14 to the application pipe 16 and the recirculation pipe 17.

[0024] The application pipe 16 is a pipe that has an open end and is disposed inside an agricultural greenhouse. The recirculation pipe 17 is a pipe that connects the branching section 15 and the combustion section 3A. Combustion exhaust gas diluted with air is introduced into the recirculation pipe 17. A recirculation valve 23 is disposed in the recirculation pipe 17. The opening of the recirculation valve 23 is set according to the amount of air required in the combustion section 3A.

[0025] <Combustion section 3A> The combustion unit 3A has a function of burning wood fuel such as firewood, wood chips, and charcoal to generate carbon dioxide to be supplied to the agricultural greenhouse. The combustion unit 3A also has a function of heating the air in the agricultural greenhouse using the combustion exhaust gas. The combustion unit 3A supplies the combustion exhaust gas to the agricultural greenhouse and the combustion unit 3A via the pipes 11-17.

[0026] As shown in FIG. 3, the combustion section 3A includes a separation section 30, an outer wall section 31, an inner side section 32, an inner bottom section 33, a flow straightening plate 37, and a plurality of air supply passages . The isolation unit 30 is disposed on the ground and supports the combustion unit 3A from below, thereby isolating the outer wall unit 31 from the ground. The isolation unit 30 separates the lower wall unit 31C forming the lower surface of the outer wall unit 31 from the ground, and most of it is open to the atmosphere. Note that the isolation unit 30 may be configured to isolate the outer wall unit 31 from the ground, for example, by supporting the outer wall unit 31 from above or laterally.

[0027] The outer wall 31 is a portion that constitutes the outer wall of the combustion section 3A, and has a tubular (for example, cylindrical) main body 31A, an upper wall 31B, and the above-mentioned lower wall 31C. The main body 31A is disposed in a state in which it extends in the vertical direction, and the upper opening of the main body 31A is covered by the upper wall 31B, and the lower opening is covered by the lower wall 31C. An inlet to the exhaust pipe 11 is formed in the upper wall 31B.

[0028] The inner side portion 32 is tubular (for example, cylindrical) and is disposed inside the outer wall portion 31 so as to leave a predetermined gap between it and the main body portion 31A and to extend in the vertical direction. In other words, the inner side portion 32 and the main body portion 31A are disposed so as to form a double pipe. The upper opening of the inner side portion 32 is closed by the upper wall portion 31B.

[0029] The gap between the main body 31A and the inner side portion 32 constitutes a secondary air supply portion 35. The secondary air supply portion 35 functions as a flow path for air for secondary combustion. A secondary air hole 32H is formed near the upper end of the inner side portion 32 to introduce air flowing through the secondary air supply portion 35 into the inside of the inner side portion 32.

[0030] The inner bottom 33 is a plate-like portion that covers the lower opening of the inner side portion 32, and is disposed at a distance from the lower wall portion 31C. A large number of primary air holes 33H are formed in the inner bottom 33, through which air for primary combustion is introduced. Wood fuel is charged above the inner bottom 33, where primary combustion occurs. In other words, of the area surrounded by the inner side portion 32, the area near the inner bottom 33 is a primary combustion portion 34 configured to directly combust the wood fuel.

[0031] The straightening plate 37 is, for example, a circular plate-like portion, and is disposed below the inner bottom 33 with a predetermined gap therebetween. The gap between the inner bottom 33 and the straightening plate 37 constitutes the primary air supply section 36. The primary air supply section 36 functions as a flow path for air for primary combustion. The straightening plate 37 is configured so that its horizontal length (e.g., outer diameter) is longer than the horizontal length of the inner side section 32. In other words, the straightening plate 37 is provided so as to extend over the entire area of ​​the inner bottom 33.

[0032] The shapes of the main body 31A and the inner side portion 32 are not limited to cylindrical shapes and may be appropriately determined, for example, rectangular tubular shapes. Even in this case, the shape of the straightening plate 37 is determined according to the shape of the inner bottom portion 33 so that the straightening plate 37 extends over the entire area of ​​the inner bottom portion 33.

[0033] Below the center of the straightening vane 37, the outlet 17A of the recirculation pipe 17 faces the straightening vane 37. The recirculation pipe 17 is disposed so as to blow out the diluted combustion exhaust gas from the outlet 17A toward the straightening vane 37 (i.e., upward). However, this is not limited thereto, and the outlet 17A of the recirculation pipe 17 may be disposed on the side of the inner side portion 32 so as to face the outer circumferential surface of the inner side portion 32.

[0034] The plurality of air intake passages 40 are provided in the entire area of ​​the lower wall portion 31C so as to extend in the vertical direction, and are configured to introduce air outside the outer wall portion 31 into the interior of the outer wall portion 31. That is, the plurality of air intake passages 40 form holes penetrating the lower wall portion 31C. The cross section of each air intake passage 40 perpendicular to the vertical direction is, for example, circular, and the area of ​​the cross section decreases from the lower end to the upper end as it goes upward. That is, each air intake passage 40 is formed with a reduced section in which the area of ​​the cross section decreases as it goes upward over the entire section from the lower end to the upper end. However, this is not limited to this, and the reduced section may be formed in a part of the section of each air intake passage 40. Also, the reduced section may be formed in all air intake passages 40, or the reduced section may be formed only in the air intake passage 40 at a specific position.

[0035] Also, each A section including the upper end of the air supply passage 40 is formed by an upper cylinder portion 41, which is a cylindrical member. The upper cylinder portion 41 protrudes upward from the lower wall portion 31C, and the outer peripheral surface of the upper cylinder portion 41 is exposed to the space inside the outer wall portion 31. each A section including the lower end of the air supply passage 40 is formed by a cylindrical member, the lower cylinder portion 42. The lower cylinder portion 42 protrudes downward from the lower wall portion 31C, and the outer peripheral surface of the lower cylinder portion 42 is exposed to the space outside the outer wall portion 31.

[0036] The size and shape of the cross section of each of the plurality of air supply passages 40, as well as the length, number, and position, may be determined as appropriate. As an example, the cross section may be polygonal. The upper cylinder portion 41 and the lower cylinder portion 42 of each of the air supply passages 40 may be integrally formed with the lower wall portion 31C, or each of the air supply passages 40 having the upper cylinder portion 41 and the lower cylinder portion 42 may be formed by joining a cylindrical member to a hole provided in the lower wall portion 31C.

[0037] Furthermore, the upper cylindrical portion 41 and / or the lower cylindrical portion 42 may not be provided in each air supply flow passage 40. In other words, a section of the flow passage formed by the upper cylindrical portion 41 and / or the lower cylindrical portion 42 may be provided inside the lower wall portion 31C, and the upper end and / or the lower end of each air supply flow passage 40 may be formed as an opening in the lower wall portion 31C. Furthermore, the upper cylindrical portion 41 and / or the lower cylindrical portion 42 may be provided only in some of the multiple air supply flow passages 40.

[0038] The plurality of air intake passages 40 may be provided in the main body 31A instead of or in addition to the lower wall 31C. The plurality of air intake passages 40 may be provided with a filter for preventing the intrusion of foreign objects, insects, and the like, and for preventing ash generated by combustion inside the combustion section 3A from flowing out to the outside. Each air intake passage 40 may be provided with an adjustment mechanism for adjusting the amount of air passing through the air intake passage 40.

[0039] The diluted combustion exhaust gas from the recirculation pipe 17 and the air introduced from the multiple air intake passages 40 (hereinafter collectively referred to as combustion exhaust gas, etc.) are supplied to the primary air supply section 36 and the secondary air supply section 35. In this embodiment, the combustion exhaust gas, etc. is guided to the secondary air supply section 35 by the straightening vane 37, and the flow rate of the combustion exhaust gas, etc. is adjusted so that the flow rate of the secondary air supply section 35 is greater than the flow rate of the primary air supply section 36. This makes it possible to properly set the flow rates of the combustion exhaust gas, etc. in the primary air supply section 36 and the secondary air supply section 35.

[0040] When the outlet 17A of the recirculation pipe 17 is disposed so as to face the outer circumferential surface of the inner side portion 32, the combustion exhaust gas flowing out from the outlet 17A is guided to the secondary air supply section 35 by the inner side portion 32. Even in this case, the flow rate of the combustion exhaust gas and the like is adjusted so that the secondary air supply section 35 has a larger flow rate than the primary air supply section 36.

[0041] Meanwhile, inside the inner side portion 32, the combustion exhaust gas including the unburned gas after the primary combustion rises along the vertical direction. When oxygen is supplied to the combustion exhaust gas after the primary combustion by the air for secondary combustion supplied from the secondary air holes 32H, the combustion exhaust gas spontaneously ignites and secondary combustion occurs. In other words, among the area surrounded by the inner side portion 32, the area above the secondary air holes 32H is the secondary combustion section 38 configured to burn the unburned gas.

[0042] <Purification Department 5> The purification section 5 is configured to cool and purify the combustion exhaust gas by passing a portion of the combustion exhaust gas generated in the combustion section 3A through the liquid L. The purification section 5 is configured to take in the combustion exhaust gas generated in the combustion section 3A 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 at least a portion of the components contained in the combustion exhaust gas are removed by compounds contained in the liquid L.

[0043] As shown in FIG. 4, the purification section 5 includes a storage section 51, a porous plate 53, a drainage channel 54, and an input channel 55. The storage section 51 is a tubular section in which a space 52 for storing the liquid L is formed. In this embodiment, the storage section 51 is cylindrical and is formed so that the vertical length is longer than the horizontal length. The storage section 51 is designed to increase the distance that the bubbles B described below travel in the liquid L. Note that the storage section 51 is not limited to a cylindrical shape, and any shape can be applied.

[0044] The porous plate 53 is a plate-like member in which a large number of holes are formed. The porous plate 53 is made of, for example, a metal having alkali resistance. If the holes in the porous plate 53 are too large, the bubbles B become large and the contact area between the bubbles B and the liquid L becomes small, making it difficult for the purification unit 5 to perform the cooling and purification functions. On the other hand, if the holes are too small, the bubbles B become small, but it becomes difficult for the bubbles B to pass through the porous plate 53. The size of the holes in the porous plate 53 is set so that the size of the bubbles B passing through the liquid L is appropriate. The number of holes can be set to any number as long as it is set to a number that does not hinder the passage of the combustion exhaust gas.

[0045] The drainage channel 54 is a flow path for maintaining a constant level of the liquid L by discharging the liquid L to the outside of the purification unit 5 by liquid pressure when the level of the liquid L rises due to, for example, mixing of condensed water of the combustion exhaust gas with the liquid L. In other words, the drainage channel 54 is a drain for adjusting the water level.

[0046] In this embodiment, the drainage channel 54 is provided with an adjustment valve 56. The adjustment valve 56 is preferably configured to allow the liquid L to be discharged from the drainage channel 54 and to allow air to flow in from the drainage channel 54. However, it is desirable that the adjustment valve 56 is configured to somewhat suppress the inflow of air. This is because if too much air flows in, the introduction flow rate of the combustion exhaust gas decreases. In this embodiment, an appropriate amount of air flows in from the drainage channel 54, so that the introduction flow rate of the combustion exhaust gas and the flow rate of the air can be well controlled by the application valve 22.

[0047] The regulating valve 56 may be, for example, a check valve (i.e., a non-return valve). Also, as long as the liquid L can be discharged in accordance with the rise in the liquid level of the liquid L, the regulating valve 56 does not necessarily have to be provided in the drainage channel 54. Even if the regulating valve 56 is not provided in the drainage channel 54, the drainage channel 54 functions as an air introduction section by the operation of the blower 7.

[0048] The input path 55 is a flow path that can be opened and closed, and is a flow path through which an operator inputs the liquid L. The liquid L generated in a recycling procedure described below is input from the input path 55. The liquid L stored in the purification unit 5 is, for example, an alkaline solution, and can remove harmful substances such as sulfides and nitrides contained in the combustion exhaust gas. The liquid L is, for example, an aqueous solution of a compound that reacts with sulfides and nitrides. The liquid L is, for example, an aqueous solution containing a large amount of potassium carbonate.

[0049] 1, 4, etc., the end of intake pipe 12 on the purification unit 5 side is connected to the lower surface of purification unit 5, but the end of intake pipe 12 may be connected to a side surface of purification unit 5 below porous plate 53. In addition, intake pipe 12 may be arranged so as to pass from the upper surface of purification unit 5 through the inside of purification unit 5 and open into liquid L.

[0050] The combustion exhaust gas introduced into the liquid L becomes bubbles B of an appropriate size and rises through the liquid L. In other words, bubbling occurs. The combustion exhaust gas that has passed through the liquid L is sent to the blower 7 via the pressure reducing pipe 13.

[0051] <Bloor 7> The blower 7 is a fan for sending out the combustion exhaust gas to the agricultural greenhouse. The blower 7 is disposed between the decompression pipe 13 and the pressurization pipe 14. The blower 7 sucks in the diluted combustion exhaust gas from the decompression pipe 13 and discharges it to the pressurization pipe 14 side.

[0052] That is, the combustion exhaust gas generated in the combustion section 3A and flowing out from the exhaust pipe 11 is diluted by air introduced by the blower 7 through the inlet / outlet section 28. The diluted combustion exhaust gas is sent by the blower 7 through the pipes 12-14, 16 into the agricultural greenhouse, and is supplied to the combustion section 3A through the pipes 12-14, 17. More specifically, the pipes 11-14, 17 function as an air supply promotion section for supplying the diluted combustion exhaust gas to the secondary air supply section 35.

[0053] [1-2. Placement] In the carbon dioxide application device 1A, as shown in Fig. 1, the combustion section 3A and the purification section 5 are arranged outside the agricultural greenhouse, and the blower 7 is arranged inside the agricultural greenhouse. The purification section 5 may be arranged inside the agricultural greenhouse. Even if toxic gas is generated in the combustion section 3A, it is easy to prevent the toxic gas from filling the agricultural greenhouse, because the combustion section 3A is arranged outside the agricultural greenhouse.

[0054] [1-3. Operation method of carbon dioxide application device 1A] Next, a method for operating the carbon dioxide application device 1A will be described with reference to the flowchart of FIG.

[0055] In S100, the worker sets the various valves 21-23 in the carbon dioxide application device 1A. In the following S105, the worker puts wood fuel into the inner bottom 33 of the combustion section 3A to start combustion in the combustion section 3A and operates the blower 7. As a result, the combustion exhaust gas generated in the combustion section 3A is applied to the agricultural greenhouse (S110).

[0056] Specifically, when application valve 22 is not in a shutoff state and exhaust valve 21 is not in a shutoff state, the combustion exhaust gas diluted with air introduced from inlet / outlet section 28 is guided by intake pipe 12 to purification section 5, where it is purified. On the other hand, when exhaust valve 21 is in a shutoff state, undiluted combustion exhaust gas is purified in purification section 5.

[0057] The purified combustion exhaust gas then passes through the decompression pipe 13, the pressurization pipe 14, and the application pipe 16, flows into the agricultural greenhouse, and is applied. Meanwhile, a part of the combustion exhaust gas passing through the pressurization pipe 14 passes through the branching section 15, flows into the recirculation pipe 17, and heads toward the combustion section 3A. The combustion exhaust gas that has reached the combustion section 3A flows out from the outlet 17A of the recirculation pipe 17 into the inside of the combustion section 3A, passes through the secondary air supply section 35 and the secondary air hole 32H, and flows into the secondary combustion section 38, promoting secondary combustion.

[0058] Thereafter, in S115, the operator stops the blower 7 and also stops the combustion in the combustion section 3A, thereby ending the application of carbon dioxide.

[0059] In S120, after the combustion in the combustion section 3A has stopped, the worker removes ash generated by the combustion of wood combustion from the combustion section 3A and generates an aqueous solution containing the removed ash (S125). Specifically, for example, the worker may put the removed ash into water, stir, and separate and remove solid matter in the stirred water to generate an aqueous solution containing ash. Note that S120 and S125 correspond to the above-mentioned recycling procedure. In S130, the worker pours the aqueous solution containing ash into the storage section 51 of the purification section 5 as alkaline liquid L.

[0060] In addition, the aqueous solution containing ash may be produced from ash produced in the combustion section 3A of a carbon dioxide application device 1A other than the carbon dioxide application device 1A provided with the purification section 5 for injecting the alkaline liquid L. Furthermore, the aqueous solution containing ash may be produced from ash produced by combustion other than the carbon dioxide application device 1A. Of course, the method for producing the alkaline liquid L is not limited to this, and for example, an alkaline aqueous solution containing a substance other than ash may be used as the liquid L. Thereafter, the process proceeds to S100, whereby the application of carbon dioxide by the carbon dioxide application device 1A is resumed.

[0061] [1-4. Effects] According to the embodiment described above in detail, the following effects are achieved. (1a) One aspect of the present disclosure is a carbon dioxide application device 1A, which includes a combustion section 3A, pipes 11-16, an introduction and discharge section 28, a blower 7, and an exhaust valve 21. The combustion section 3A is configured to introduce air for combustion and burn wood fuel to generate combustion exhaust gas. The pipes 11-16 form a flow path of the combustion exhaust gas from the combustion section 3A to the agricultural house. The introduction and discharge section 28 is configured to introduce air for diluting the combustion exhaust gas in the pipes 11-16. The blower 7 is disposed in the pipes 11-16 and configured to send the combustion exhaust gas generated in the combustion section 3A to the agricultural house. The exhaust valve 21 is disposed in the pipes 11-16 and configured to be able to change the flow path of the combustion exhaust gas between the introduction and discharge section 28 side and the agricultural house side.

[0062] With this configuration, the flow rate of the air supplied to the combustion section 3A and the air introduced from the inlet / outlet section 28 for dilution can be adjusted by operating the exhaust valve 21, so that good combustion conditions can be maintained in the combustion section 3A.

[0063] (1b) The pipes 11 to 16 are provided with a recirculation pipe 17 on the agricultural house side of the blower 7 for returning at least a part of the combustion exhaust gas to the combustion section 3A. According to such a configuration, the combustion state in the combustion section 3A can be adjusted by the air blown from the blower .

[0064] (1c) The carbon dioxide application device 1A further includes a recirculation valve 23 disposed in the recirculation pipe 17 and configured to adjust the flow rate of the recirculation pipe 17. According to this configuration, the flow rate of the combustion exhaust gas recirculated to the combustion section 3A via the recirculation pipe 17 can be adjusted using the recirculation valve 23. Therefore, the combustion state in the combustion section 3A can be well adjusted.

[0065] (1d) The carbon dioxide application device 1A further includes a purification unit 5. The purification unit 5 is configured to store an alkaline solution between the inlet / outlet unit 28 and the blower 7 in the pipes 11-16, and to allow the combustion exhaust gas generated in the combustion unit 3A to pass through the alkaline solution. The purification unit 5 has a drainage channel 54. The drainage channel 54 functions both as a drain and an air inlet. According to such a configuration, the drainage channel 54 provided in the purification section 5 as a drain can also be used as an air introduction section.

[0066] 2. Other embodiments Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0067] (2a) In the above embodiment, the combustion exhaust gas is directly applied to the agricultural house, but the present invention is not limited to this. For example, as in the carbon dioxide application device 1B of the first modified example shown in FIG. 6, carbon dioxide may be temporarily stored in the storage tank 9, and then the stored carbon dioxide may be applied to the agricultural house. That is, for example, when photosynthesis is not sufficient in the agricultural house due to bad weather, the combustion exhaust gas generated in the combustion section 3A may not be applied to the agricultural house, and the carbon dioxide contained in the combustion exhaust gas may be stored in the storage tank 9. Then, when the weather is good, the carbon dioxide stored in the storage tank 9 may be applied to the agricultural house without performing combustion in the combustion section 3A.

[0068] For example, the carbon dioxide application device 1B of the first modified example further includes a storage tank 9, an intermediate pipe 18, a storage valve 24, and a direct valve 25. The intermediate pipe 18 is configured to connect the pressurized pipe 14 and the application pipe 16, and to connect the pressurized pipe 14 and the storage tank 9. The intermediate pipe 18 is configured to branch into the storage tank 9 side and the application pipe 16 side, and the storage valve 24 is disposed in the flow path on the storage tank 9 side, and the direct valve 25 is disposed in the flow path on the application pipe 16 side.

[0069] An adsorbent that adsorbs carbon dioxide in the combustion exhaust gas is disposed inside the storage tank 9. As the adsorbent in the storage tank 9, for example, activated carbon, zeolite, or other porous material can be used.

[0070] When carbon dioxide is adsorbed in the storage tank 9, the storage valve 24 is opened and the direct valve 25 is closed. Then, the blower 7 causes the combustion exhaust gas generated in the combustion section 3A to flow into the storage tank 9 and the combustion exhaust gas is brought into contact with the adsorbent. As a result, the carbon dioxide contained in the combustion exhaust gas is adsorbed by the adsorbent and stored in the storage tank 9.

[0071] Also, when applying the carbon dioxide adsorbed in the storage tank 9, the storage valve 24 is opened and the direct valve 25 is closed. Then, the blower 7 causes air introduced from the inlet / outlet part 28 to flow into the storage tank 9, and the air that has passed through the storage tank 9 is caused to flow into the agricultural greenhouse. This allows the carbon dioxide adsorbed in the adsorbent to be desorbed, and the air containing the desorbed carbon dioxide to flow into the agricultural greenhouse.

[0072] When the combustion exhaust gas is directly applied to the agricultural greenhouse without using the storage tank 9, the storage valve 24 is closed and the direct valve 25 is opened. Then, in the same manner as in the above embodiment, the carbon dioxide generated in the combustion section 3A is applied to the agricultural greenhouse.

[0073] (2b) In the above embodiment, in the combustion section 3A, the outlet 17A of the recirculation pipe 17 is located below the inner bottom portion 33, and the combustion exhaust gas is introduced from below the inner bottom portion 33, but the structure of the combustion section 3A is not limited to this. For example, as in a combustion section 3B of a second modified example shown in Fig. 7A, the outlet 17A of the recirculation pipe 17 may be located to the side of the inner side portion 32 inside the outer wall portion 31 and face the outer circumferential surface of the inner side portion 32. The combustion exhaust gas may flow out horizontally from the outlet 17A of the recirculation pipe 17 toward the inner side portion 32.

[0074] Furthermore, like the combustion section 3B of the second modified example, multiple air supply passages 43 may be formed by holes provided at the lowermost part of the main body 31A of the outer wall 31, and multiple air supply passages 40 may not be provided in the lower wall 31C. With such a configuration, the combustion section 3B can be arranged so that the lower wall 31C contacts the ground, making the isolation section 30 unnecessary.

[0075] (2c) In the combustion section 3A of the above embodiment, the outer wall 31 is a straight cylinder, and inside the outer wall 31, the secondary combustion section 38 is located above the primary combustion section 34, but the structure of the combustion section 3A is not limited to this. For example, as in the third modified example shown in FIG. 7B, the combustion section 3C may have a structure called a rocket stove, and the outer wall 31 may be configured as a cylindrical part bent in an L-shape with both ends open. In other words, the outer wall 31 may have a first portion 31D extending laterally and a second portion 31E extending vertically from an end of the first portion 31D, and the first portion 31D may be disposed on the ground, while the second portion 31E may be disposed so as to extend upward from the ground.

[0076] The first section 31D is provided with an input section for inputting wood fuel, and a primary combustion section 34 is formed inside the first section 31D around the wood fuel input from the input section. Also, the outlet 17A of the recirculation pipe 17 is arranged to face the outer circumferential surface of the second section 31E. A hole is provided near the outlet 17A in the second section 31E, and the combustion exhaust gas flowing out from the outlet 17A flows into the inside of the second section 31E from the hole. Then, a secondary combustion section 38 is formed inside the second section 31E near the hole.

[0077] (2d) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0078] (2e) In addition to the above-mentioned carbon dioxide application apparatuses 1A and 1B, the present disclosure can also be realized in various forms, such as a system including the carbon dioxide application apparatuses 1A and 1B as components, a carbon dioxide application method, and a method for producing an alkaline solution.

[0079] [Technical idea disclosed in this specification] [Item 1] A combustion section configured to introduce air for combustion and burn wood fuel to generate combustion exhaust gas; A pipe that constitutes a flow path of the combustion exhaust gas from the combustion unit to the agricultural house; an air introduction section configured to introduce air for diluting the combustion exhaust gas in the piping; A blower disposed in the piping and configured to send the combustion exhaust gas generated in the combustion section to the agricultural greenhouse; an exhaust valve disposed in the piping and capable of changing a flow path of the combustion exhaust gas between the air inlet side and the agricultural greenhouse side; A carbon dioxide application device comprising: [Item 2] The carbon dioxide application device according to item 1, the piping is a recirculation pipe for returning at least a part of the combustion exhaust gas to the combustion section, the recirculation pipe being located on the agricultural house side of the blower; A carbon dioxide application device comprising: [Item 3] The carbon dioxide application device according to item 2, a recirculation valve disposed in the recirculation pipe and configured to adjust a flow rate of the recirculation pipe; The carbon dioxide application device further comprises: [Item 4] The carbon dioxide application device according to any one of items 1 to 3, The piping further includes a purification section between the air introduction section and the blower, the purification section being configured to store an alkaline solution and pass the combustion exhaust gas generated in the combustion section through the alkaline solution; The carbon dioxide application device, wherein the purification section has a drain for adjusting the water level and a drainage channel that also functions as an air introduction section. [Explanation of symbols]

[0080] 1A, 1B...carbon dioxide application device, 3A, 3B, 3C...combustion section, 5...purification section, 7...blower, 9...storage tank, 11-17...piping, 12B...curved pipe section, 17...recirculation pipe, 21...exhaust valve, 23...recirculation valve, 28...inlet and outlet section, 30...isolation section, 31...main body, 32...inner side section, 33...inner bottom section, 34...primary combustion section, 35...secondary air supply section, 36...primary air supply section, 37...baffle, 38...secondary combustion section, 40...air supply flow path, 41...upper cylinder section, 41...lower cylinder section, 51...storage section, 53...perforated plate, 54...drainage channel, 55...inlet channel, 56...adjusting valve, L...liquid.

Claims

1. A combustion section configured to introduce air for combustion and burn wood fuel to generate combustion exhaust gas; A pipe that constitutes a flow path of the combustion exhaust gas from the combustion unit to the agricultural house; an air introduction section configured to introduce air for diluting the combustion exhaust gas in the piping; A blower disposed in the piping and configured to send the combustion exhaust gas generated in the combustion section to the agricultural greenhouse; an exhaust valve disposed in the piping and capable of changing a flow path of the combustion exhaust gas between the air inlet side and the agricultural greenhouse side; A carbon dioxide application device comprising:

2. The carbon dioxide application device according to claim 1, the piping is a recirculation pipe for returning at least a part of the combustion exhaust gas to the combustion section, the recirculation pipe being located on the agricultural house side of the blower; A carbon dioxide application device comprising:

3. The carbon dioxide application device according to claim 2, a recirculation valve disposed in the recirculation pipe and configured to adjust a flow rate of the recirculation pipe; The carbon dioxide application device further comprises:

4. The carbon dioxide application device according to any one of claims 1 to 3, The piping further includes a purification section between the air introduction section and the blower, the purification section being configured to store an alkaline solution and pass the combustion exhaust gas generated in the combustion section through the alkaline solution; The carbon dioxide application device, wherein the purification section has a drain for adjusting the water level and a drainage channel that also functions as an air introduction section.

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