Combustion device, carbon dioxide application device, and combustion acceleration device

Abstract

This suppresses the generation of soot and unburned wood gases during the combustion of wood fuel. [Solution] The wood fuel combustion device comprises a bottom portion in which a wood fuel combustion space is formed above, a side wall portion, a secondary combustion portion, a plurality of supply holes penetrating the secondary combustion portion, and a lower portion. The side wall portion extends upward from the bottom portion along the axis and surrounds the combustion space from the side. The secondary combustion portion is included in the side wall portion and surrounds the secondary combustion region in which secondary combustion of wood fuel takes place in the combustion space. The lower portion faces the center of the combustion space in the secondary combustion region, and a gap is formed between the lower portion and the secondary combustion portion, surrounding the lower portion. The center portion is the region located in the center of the cross-section perpendicular to the axis in the combustion space.

Description

Technical Field

[0001] The present disclosure relates to a combustion device for burning woody fuel, a carbon dioxide application device for applying carbon dioxide generated by the combustion device of woody fuel to an agricultural greenhouse, and a combustion promotion device used for the combustion device of woody fuel.

Background Art

[0002] As disclosed in Patent Documents 1 and 2, there is known a technique for applying carbon dioxide contained in combustion exhaust gas generated by combustion of heavy oil, biomass fuel, etc. to an agricultural greenhouse for cultivating plants indoors.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the combustion exhaust gas of woody fuel may contain soot and unburned wood gas containing harmful substances. Therefore, when applying carbon dioxide by supplying the combustion exhaust gas to an agricultural greenhouse, there is a risk that soot and unburned wood gas will also be supplied to the agricultural greenhouse.

[0005] One aspect of the present disclosure desirably suppresses the generation of soot and unburned wood gas during the combustion of woody fuel.

Means for Solving the Problems

[0006] One aspect of the present disclosure is a wood fuel combustion apparatus comprising a bottom, a side wall, a secondary combustion section, a plurality of supply holes, and a lower section. The bottom provides an upper combustion space for wood fuel. The side wall extends upward from the bottom along an axis, surrounding the combustion space from the side, and is open on the opposite side of the bottom. The secondary combustion section is a part included in the side wall and surrounds the secondary combustion region, which is the area in the combustion space where secondary combustion of wood fuel takes place. The plurality of supply holes penetrate the secondary combustion section. The lower section is located inside the secondary combustion section. The lower section also faces the center of the combustion space in the secondary combustion region, and a gap surrounding the lower section is formed between the lower section and the secondary combustion section. The center is the region located in the center of a cross-section perpendicular to the axis in the combustion space.

[0007] According to the above configuration, soot generated during the primary combustion of wood fuel adheres to the lower surface of the lower section, and this soot can be burned during secondary combustion. Furthermore, as the rising wood gas collides with the lower section, the wood gas can be guided toward the multiple supply holes in the side wall (in other words, the gap between the lower section and the secondary combustion section), thereby promoting secondary combustion and reducing unburned wood gas. Consequently, the generation of soot and unburned wood gas during the combustion of wood fuel can be suppressed.

[0008] One aspect of the present disclosure may further comprise an upper portion located above the lower portion. The upper portion may have a portion facing the periphery of the combustion space and a central opening surrounded by the portion. The periphery may be a region extending along the outer edge of the cross-section of the combustion space and surrounding the center of the cross-section.

[0009] According to the above configuration, the air flowing in from multiple supply holes and the wood gas can be mixed well around the secondary combustion section, thereby promoting secondary combustion. Consequently, the generation of unburned wood gas can be suppressed.

[0010] In one aspect of this disclosure, when viewed in the axial direction, the lower portion may be located inside the outer edge of the central opening of the upper portion. According to the above configuration, the air flowing in from multiple supply holes and the wood gas can be mixed more effectively around the secondary combustion section, thereby further promoting secondary combustion. Consequently, the generation of unburned wood gas can be suppressed even more effectively.

[0011] One aspect of the present disclosure may further include a blower located below the bottom for blowing air toward the secondary combustion section. According to the above configuration, air can be supplied more effectively to the secondary combustion area through multiple supply holes in the secondary combustion section. This promotes secondary combustion and, as a result, suppresses the generation of unburned wood gas.

[0012] One aspect of the present disclosure is a carbon dioxide application device for applying carbon dioxide to an agricultural greenhouse, comprising the combustion device described above and a supply unit. The supply unit is configured to supply the combustion exhaust gas generated by the combustion device to the agricultural greenhouse.

[0013] According to the above configuration, when burning wood to apply carbon dioxide to agricultural greenhouses, the generation of soot and unburned wood gas can be suppressed. One aspect of the present disclosure is a combustion accelerator used in a wood fuel combustion apparatus, comprising an upper part, a lower part, and a plurality of connecting parts. The upper part is a plate-shaped portion with a central opening. The lower part is a plate-shaped portion positioned to face the central opening. The plurality of connecting parts connect the upper part and the lower part. The combustion apparatus comprises a bottom part, a side wall part, and a secondary combustion part. The bottom part forms a combustion space for wood fuel above it. The side wall part is a portion that extends upward from the bottom part along an axis, surrounding the combustion space from the side, and having an opening on the opposite side of the bottom part. The secondary combustion part is a portion included in the side wall part, surrounding a secondary combustion region which is a space in which secondary combustion of wood fuel takes place in the combustion space. The combustion accelerator is positioned in the combustion apparatus such that the upper part faces the periphery of the combustion space, and the lower part faces the center of the combustion space below the upper part. The central region is the area located in the center of a cross-section perpendicular to the axis of the combustion space. The peripheral region is the area that extends along the outer edge of the cross-section in the combustion space and surrounds the center of the said cross-section.

[0014] According to the above configuration, by using the combustion accelerator in the wood fuel combustion device, it is possible to suppress the generation of soot and unburned wood gas when burning wood fuel in the combustion accelerator. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1A is an explanatory diagram of a carbon dioxide application device according to the first embodiment. Figure 1B is an explanatory diagram of a combustion device according to the first embodiment, in which a combustion accelerator is not provided. [Figure 2] Figure 2A is a perspective view of the combustion accelerator of the first embodiment. Figure 2B is an explanatory diagram showing the combustion apparatus of the first embodiment, in which the combustion accelerator is located, viewed from the side. [Figure 3] This is an explanatory diagram of a combustion apparatus according to a second embodiment, in which a combustion accelerating device is installed. [Modes for carrying out the invention]

[0016] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. First Embodiment] [(1) Carbon Dioxide Application Device] The carbon dioxide application device 1 of the first embodiment supplies combustion exhaust gas generated by burning wood-based fuel as a raw material to the agricultural greenhouse 4, thereby applying carbon dioxide to the agricultural greenhouse 4 (see Fig. 1A). The carbon dioxide application device 1 includes a combustion unit 10, a purification tank 11, a blower 12, an application flow path 13, and a blowing flow path 14.

[0017] [Combustion Unit] The combustion unit 10 is a part that forms a space for accommodating the wood-based fuel combustion device 2 (see Fig. 1A). The combustion unit 10 has a wall portion that separates the space from the outside, and a chimney 10A that protrudes upward from the upper part of the wall portion. The combustion exhaust gas generated by the combustion device 2 disposed inside the combustion unit 10 can pass through the chimney 10A and be discharged to the outside.

[0018] [Application Flow Path] The application flow path 13 is a part for supplying the combustion exhaust gas generated by the combustion device 2 disposed in the combustion unit 10 to the agricultural greenhouse 4 (see Fig. 1A). The application flow path 13 is a tubular member extending from the chimney 10A of the combustion unit 10 to the agricultural greenhouse 4, and the purification tank 11 and the blower 12 are disposed in the application flow path 13.

[0019] [Purification Tank] The purification tank 11 is a part for storing the purification liquid for combustion exhaust gas (see Fig. 1A). The purification tank 11 purifies the combustion exhaust gas by allowing the combustion exhaust gas supplied through the application flow path 13 to pass through the purification liquid. The purification liquid may be, for example, an alkaline solution. By using such a purification liquid, harmful substances such as sulfides and nitrides contained in the combustion exhaust gas are removed. Also, the alkaline purification liquid may be generated, for example, by dissolving the ash generated by the combustion of wood-based fuel in water.

[0020] [Blower] The blower 12 is installed between the purification tank 11 and the agricultural greenhouse 4 in the application channel 13, and pressurizes the combustion exhaust gas generated in the combustion section 10 and sends it to the agricultural greenhouse 4 via the application channel 13 (see Figure 1A). The blower 12 also recirculates a portion of the combustion exhaust gas heading towards the agricultural greenhouse 4 back to the combustion section 10 via the air supply channel 14.

[0021] <Application channel> The airflow channel 14 is a section for circulating a portion of the combustion exhaust gas to the combustion section 10 (see Figure 1A). The airflow channel 14 is a tubular member that extends from the section between the blower 12 and the agricultural greenhouse 4 in the application channel 13 to the combustion section 10.

[0022] [(2) Combustion device] The combustion device 2 is a device for burning wood fuel and comprises a combustion chamber 20 and an outer case 24 (see Figure 1B). The combustion device 2 is also equipped with a combustion accelerator 3 (see Figures 2A and 2B).

[0023] <Combustion chamber> The combustion chamber 20 is the part where wood fuel is burned, and it comprises a bottom portion 21 and side wall portions 22 (see Figures 1B and 2B).

[0024] The bottom portion 21 is a flat plate-shaped section for placing wood fuel, and is circular in shape, for example. Above the bottom portion 21, a combustion space 2A is formed where the wood fuel is burned. The side wall portion 22 extends straight upward along axis A from the edge of the bottom portion 21 and is a cylindrical portion that surrounds the combustion space 2A from the side. The lower opening of the side wall portion 22 is closed by the bottom portion 21. On the other hand, the upper opening of the side wall portion 22 is open to the outside and forms a circular upper opening 20A, which is the upper end of the combustion space 2A.

[0025] Axis A is a virtual line extending in the vertical direction, passing through the center of the bottom 21, the center of the upper opening 20A, and the center of the cross-section (hereinafter simply referred to as the cross-section) perpendicular to axis A in the combustion space 2A.

[0026] In the combustion space 2A, a primary combustion region 2B is formed around the bottom 21 where primary combustion of woody fuel takes place. Multiple first supply holes 23A are provided near the bottom 21 in the side wall portion 22 to supply air to the primary combustion region 2B. The multiple first supply holes 23A are arranged at regular intervals along the circumferential direction (hereinafter simply referred to as the circumferential direction) centered on axis A.

[0027] Furthermore, the region adjacent to the lower side of the upper opening 20A in the combustion space 2A is the secondary combustion region 2C where secondary combustion of wood fuel takes place. The secondary combustion region 2C is located above the primary combustion region 2B.

[0028] <Secondary combustion section> The portion of the side wall 22 surrounding the secondary combustion region 2C forms a secondary combustion section 22A (see Figures 1B and 2B). The secondary combustion section 22A is adjacent to the lower side of the upper opening 20A, and a plurality of second supply holes 23B are provided that penetrate the secondary combustion section 22A. The plurality of second supply holes 23B are provided to supply air to the secondary combustion region 2C, and a large number of them are provided throughout the entire area of ​​the secondary combustion section 22A.

[0029] <Outer case> The outer case 24 is the part that houses the combustion chamber 20 inside, and comprises a bottom portion 24A, a side wall portion 24B, and a top portion 24C (see Figures 1B and 2B).

[0030] The side wall portion 24B is a cylindrical part that surrounds the combustion chamber 20 from the side and extends along axis A. The bottom portion 24A is a circular, flat plate-shaped part that closes the opening on the lower side of the side wall portion 24B, and a hole 24E is provided in its center for inserting the end of the airflow channel 14 (hereafter referred to as the outlet portion 14A). In addition, multiple legs are provided on the lower surface of the bottom portion 24A for supporting the outer case 24.

[0031] The top portion 24C is a circular, flat plate-like portion that covers the opening at the upper end of the side wall portion 24B. A circular opening (hereafter referred to as the outer opening 24D) is formed in the center of the top portion 24C. The combustion chamber 20 is positioned inside the outer case 24 with its upper opening 20A overlapping the outer opening 24D of the top portion 24C. In other words, the outer opening 24D and the upper opening 20A are located at approximately the same position in the direction of axis A. The side wall portion 22 of the combustion chamber 20 extends downward from the portion that forms the outer edge of the outer opening 24D at the top portion 24C.

[0032] For example, the upper end of the side wall portion 22 that forms the outer edge of the upper opening 20A in the combustion chamber 20 is joined to the outer edge of the outer opening 24D at the top portion 24C, and the combustion chamber 20 is supported by the joint between the upper end and the outer edge. However, the combustion chamber 20 is not limited to this, and may also be supported by support members provided on the bottom portion 24A or the side wall portion 24B of the outer case 24, for example.

[0033] The side wall portion 24B of the outer case 24 and the side wall portion 22 of the combustion chamber 20 are arranged concentrically, for example, and the axis A passes through the center of the bottom portion 24A, the center of the cross-section of the side wall portion 24B, and the center of the top portion 24C and the outer opening 24D.

[0034] Furthermore, a space exists between these side wall portions 22 and 24B, and the bottom portion 21 of the combustion chamber 20 is positioned away from the bottom portion 24A of the outer case 24 and the outlet portion 14A of the airflow passage 14.

[0035] [(3) Combustion Accelerator] The combustion accelerator 3 is a device that promotes secondary combustion in the combustion chamber 20 and is located in the secondary combustion region 2C (see Figures 2A and 2B). The combustion accelerator 3 is configured as a separate device from the combustion device 2, and can be used in a combustion device other than the combustion device 2 of this embodiment, or it can be sold on the market independently. The combustion accelerator 3 comprises an upper part 30, a lower part 31, and a plurality of connecting parts 32.

[0036] <Upper part> The upper portion 30 is a rectangular, flat plate-like section with a circular opening (hereafter referred to as the central opening 30A) formed in the center (see Figure 2A).

[0037] The upper portion 30 faces the periphery of the combustion space 2A and is positioned to overlap from above the top portion 24C of the outer case 24 and the upper opening 20A of the combustion chamber 20 (see Figure 2B). The periphery of the combustion space 2A refers to the region that extends along the outer edge of the cross-section of the combustion space 2A and surrounds the center of the cross-section.

[0038] Specifically, the outer edge of the central opening 30A of the upper part 30 and the outer edge of the upper opening 20A of the combustion chamber 20 are, for example, approximately concentric circles, and axis A passes through approximately the center of the central opening 30A. The ring-shaped portion around the central opening 30A of the upper part 30 faces the secondary combustion region 2C of the combustion chamber 20.

[0039] Of course, the shapes of the upper portion 30 and the central opening 30A are not limited to those described above and can be determined as appropriate. Furthermore, the positions of the upper portion 30 and the central opening 30A can also be determined as appropriate. <Lower part> The lower portion 31 is a circular, flat plate-like part positioned to face the upper opening 20A of the upper portion 30 (see Figures 2A and 2B). The lower portion 31 is supported below the upper portion 30 by a plurality of connecting portions 32 and is positioned inside the secondary combustion section 22A, approximately perpendicular to axis A. The lower portion 31 faces the center of the combustion space 2A (more specifically, the secondary combustion region 2C), and a gap surrounding the lower portion 31 is formed between the lower portion 31 and the secondary combustion section 22A. The center of the combustion space 2A is the region located in the center of the cross-section of the combustion space 2A.

[0040] Specifically, axis A passes through approximately the center of the lower part 31. Also, when viewed in the direction of axis A, the lower part 31 is located inside the outer edge of the central opening 30A of the upper part 30. More specifically, the lower part 31 and the central opening 30A of the upper part 30 (and the upper opening 20A of the combustion chamber 20) are arranged concentrically, for example.

[0041] Of course, the shape of the lower portion 31 is not limited to a circle and can be determined as appropriate. The position and orientation of the lower portion 31 can also be determined as appropriate. For example, when viewed in the direction of axis A, the outer edge of the lower portion 31 may overlap with the outer edge of the central opening 30A of the upper portion 30, or all or part of the lower portion 31 may overlap with the upper portion 30.

[0042] <Connection part> The multiple (for example, four) connecting parts 32 are rod-shaped sections that connect the upper part 30 and the lower part 31, and for example, they extend straight (see Figure 2A). The first end of each connecting part 32 is joined to the part of the upper part 30 that forms the outer edge of the central opening 30A, and the second end is joined to the outer edge of the lower part 31. The multiple connecting parts 32 are arranged at regular intervals along the circumferential direction. As a result, four openings are formed, each enclosed by two adjacent connecting parts 32, the upper part 30, and the lower part 31, and the area of ​​each opening is the same. Furthermore, the connecting parts 32 are formed to be thin so that the area of ​​each opening is sufficiently larger than the area of ​​the connecting part 32.

[0043] [(4) Application of carbon dioxide] When carbon dioxide is applied to the agricultural greenhouse 4 using the carbon dioxide application device 1, wood fuel is burned in the combustion device 2 located in the combustion section 10 (see Figure 1A). At this time, the blower 12 operates, and combustion exhaust gas is supplied to the agricultural greenhouse 4, thereby applying carbon dioxide. Some of the combustion exhaust gas is also supplied to the combustion section 10, causing the combustion exhaust gas to circulate. Alternatively, the blower 12 may supply outside air to the combustion section 10 instead of combustion exhaust gas.

[0044] In other words, in the combustion device 2, primary combustion of wood fuel takes place in the primary combustion region 2B of the combustion chamber 20, and secondary combustion takes place in the secondary combustion region 2C. In addition, circulated combustion exhaust gas is discharged from the outlet 14A of the airflow channel 14 provided in the hole 24E at the bottom 24A of the outer case 24 toward the bottom 21 of the combustion chamber 20. The combustion exhaust gas flows into the secondary combustion region 2C from multiple second supply holes 23B of the secondary combustion section 22A, thereby promoting secondary combustion. Furthermore, as will be described in detail later, the presence of a combustion accelerator 3 in the combustion device 2 further promotes secondary combustion. In short, the hole 24E corresponds to an example of an airflow section for blowing air toward the secondary combustion section 22A.

[0045] Then, all or part of the combustion exhaust gas generated in the combustion device 2 flows into the application channel 13 via the chimney 10A by the blower 12 and passes through the purification tank 11. After being purified in the purification tank, the combustion exhaust gas flows into the agricultural greenhouse 4. In other words, the chimney 10A, the application channel 13, and the blower 12 represent an example of a supply unit configured to supply combustion exhaust gas generated in the combustion device 2 to the agricultural greenhouse 4.

[0046] [2. Second Embodiment] The combustion device 2 of the second embodiment differs from the combustion device 2 of the first embodiment in that, instead of a hole 24E, an air blower 25 is provided at the bottom 24A of the outer case 24, which blows air toward the bottom 21 of the combustion chamber 20 (see Figure 3). The air blower 25 blows air in the same manner as the outlet 14A of the air blower passage 14 of the first embodiment when wood fuel is burned in the combustion device 2, and is configured as a fan, for example. Furthermore, the air blower 25 may be configured to receive power from, for example, a household outlet or from a mobile battery.

[0047] Furthermore, the combustion device 2 of the second embodiment may be placed in the combustion section 10 of the carbon dioxide application device 1, similar to the first embodiment. In this case, since the combustion device 2 is provided with a blower section 25, circulation of combustion exhaust gas to the combustion section 10 by the blower 12 becomes unnecessary. For this reason, it is desirable that the carbon dioxide application device 1 does not have a blower passage 14.

[0048] Furthermore, the combustion device 2 of the second embodiment may be used, for example, as an emergency heater used during disasters. In this case, it is preferable that the air blower 25 is configured to receive power from a mobile battery.

[0049] [3. Effects] (1) When burning wood fuel in a combustion chamber with cylindrical side walls, soot is generated at the tip of the flame, making it more likely for soot to be generated in the center of the combustion chamber. Furthermore, even if multiple holes are formed in the side walls, air does not easily reach the center of the combustion chamber, making it more likely for unburned wood gas to be generated in the center of the combustion chamber.

[0050] In contrast, according to the above embodiment, the lower part 31 of the combustion accelerator 3 is positioned in the secondary combustion region 2C so as to face the center of the combustion space 2A (see Figure 2B). As a result, soot generated during the primary combustion of wood fuel adheres to the lower surface of the lower part 31, and this soot can be burned by secondary combustion. Furthermore, as the rising wood gas collides with the lower part 31, the wood gas can be guided toward the multiple second supply holes 23B in the side wall portion 22 of the combustion chamber 20 (in other words, the gap between the lower part 31 and the secondary combustion section 22A), thereby promoting secondary combustion and reducing unburned wood gas. Consequently, the generation of soot and unburned wood gas during the combustion of wood fuel can be suppressed.

[0051] (2) The combustion accelerator 3 also has an upper portion 30 facing the periphery of the combustion space 2A. This allows for good mixing of the air flowing in from the multiple second supply holes 23B and the wood gas in the secondary combustion region 2C around the secondary combustion section 22A, thereby promoting secondary combustion. Consequently, the generation of unburned wood gas can be suppressed.

[0052] (3) Furthermore, when viewed in the direction of axis A, the lower part 31 of the combustion accelerator 3 is located inside the outer edge of the central opening 30A of the upper part 30. This allows for better mixing of the air and wood gas flowing in from the multiple second supply holes 23B around the secondary combustion section 22A, thereby further promoting secondary combustion. Consequently, the generation of unburned wood gas can be suppressed even more effectively.

[0053] (4) In addition, in the combustion device 2 of the first embodiment, the combustion exhaust gas supplied by the blower 12 is discharged from the outlet 14A of the air passage 14 toward the combustion chamber 20. In addition, the combustion device 2 of the second embodiment is provided with an air blower 25, which blows air toward the combustion chamber 20. As a result, air can be supplied more effectively to the secondary combustion region 2C through the multiple second supply holes 23B of the secondary combustion section 22A. This promotes secondary combustion and, as a result, suppresses the generation of unburned wood gas.

[0054] [4. Other Embodiments] (1) In the above embodiment, the combustion accelerator 3 is configured as a separate device from the combustion device 2. However, the combustion accelerator 3 may be configured as part of the combustion device 2. In this case, the combustion accelerator 3 does not need to have an upper portion. That is, the lower portion 31 of the combustion accelerator 3 may be supported by a plurality of support members protruding from the side wall portion 22, for example, so as to be positioned in the secondary combustion region 2C of the combustion chamber 20 in the same manner as in the above embodiment.

[0055] (2) In the above embodiment, the side wall portion 22 of the combustion chamber 20 of the combustion device 2 and the side wall portion 24B of the outer case 24 are cylindrical and are arranged concentrically. However, the positions of these side walls are not limited to concentric circles and can be determined as appropriate. Also, the shape of these side walls is not limited to cylindrical and can be determined as appropriate.

[0056] (3) In the above embodiment, the position of the outer opening 24D of the top 24C of the outer case 24 of the combustion device 2 and the position of the upper opening 20A of the combustion chamber 20 in the direction of axis A are substantially the same. That is, the upper end of the side wall portion 22 of the combustion chamber 20 is adjacent to the top 24C of the outer case 24. However, the upper end of the side wall portion 22 may be located above or below the top 24C.

[0057] (4) In the above embodiment, the upper part 30 of the combustion accelerator 3 is positioned in the upper opening 20A of the combustion chamber 20 of the combustion device 2. However, the upper part 30 is not limited to this and may be positioned above or below the upper opening 20A. In this case, the shape of the upper part 30 is appropriately adjusted so that the upper part 30 faces the peripheral edge of the combustion space 2A at that position.

[0058] (5) Multiple functions of one component in the above embodiment may be realized by multiple components, or one function of one component may be realized by multiple components. Also, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Furthermore, some of the configurations of the above embodiment may be omitted. Furthermore, at least some of the configurations of the above embodiment may be added to or replaced with the configurations of other above embodiments.

[0059] [5. The technical concept disclosed herein] [Item 1] A wood fuel combustion device, The bottom portion is formed above where the combustion space for the wood fuel is located, A portion extending upward along the axis from the bottom, the side wall portion which surrounds the combustion space from the side and has an opening on the opposite side of the bottom, A portion included in the side wall portion, which surrounds the secondary combustion region, which is the region in the combustion space where secondary combustion of the wood fuel takes place, is a secondary combustion portion, Multiple supply holes penetrating the secondary combustion section, It comprises a lower part located inside the secondary combustion section, The lower portion faces the central part of the combustion space in the secondary combustion region, and a gap surrounding the lower portion is formed between the lower portion and the secondary combustion section. The central portion refers to the region located in the center of the cross-section perpendicular to the axis in the combustion space. Combustion device.

[0060] [Item 2] The combustion device described in item 1, It further comprises an upper part located above the lower part, The upper portion has a portion facing the peripheral edge of the combustion space and a central opening surrounded by that portion. The aforementioned peripheral portion is a region that extends along the outer edge of the cross-section in the combustion space and surrounds the center of the cross-section. Combustion device.

[0061] [Item 3] The combustion device described in item 2, When viewed in the direction of the aforementioned axis, the lower portion is located inside the outer edge of the central opening of the upper portion. Combustion device.

[0062] [Item 4] A combustion device described in any one of items 1 to 3, A combustion apparatus further comprising a blower located below the bottom and for blowing air toward the secondary combustion region.

[0063] [Item 5] A carbon dioxide application device for applying carbon dioxide to agricultural greenhouses, A combustion device described in any one of items 1 through 4, A supply unit configured to supply the combustion exhaust gas generated by the aforementioned combustion device to an agricultural greenhouse, A carbon dioxide application device equipped with [a specific feature].

[0064] [Item 6] A combustion accelerator used in a wood fuel combustion device, The upper part is a plate-like section with a central opening, The lower part is a plate-shaped portion that is positioned to face the central opening, It comprises a plurality of connecting parts that connect the upper part and the lower part, The combustion device is The bottom portion is formed above where the combustion space for the wood fuel is located, A portion extending upward along the axis from the bottom, the side wall portion which surrounds the combustion space from the side and has an opening on the opposite side of the bottom, The side wall portion includes a secondary combustion section which is a portion that surrounds a secondary combustion region, which is a space in the combustion space where secondary combustion of the wood fuel takes place, The combustion accelerating device is arranged in the combustion device such that its upper portion faces the peripheral edge of the combustion space, and its lower portion faces the central part of the combustion space below the upper portion. The aforementioned central portion is the region located in the center of the cross-section perpendicular to the axis in the combustion space, The aforementioned peripheral portion is a region that extends along the outer edge of the cross-section in the combustion space and surrounds the center of the cross-section. Combustion accelerator. [Explanation of Symbols]

[0065] A...Axis, 1...Carbon dioxide application device, 10...Combustion section, 10A...Chimney, 11...Purification tank, 12...Blower, 13...Application flow path, 14...Air blowing flow path, 14A...Outlet section, 2...Combustion device, 2A...Combustion space, 2B...Primary combustion area, 2C...Secondary combustion area, 20...Combustion chamber, 20A...Upper opening, 21...Bottom, 22...Side wall, 22A...Secondary combustion section, 23A...First supply hole, 23B...Second supply hole, 24...Outer case, 24A...Bottom, 24B...Side wall, 24C...Top, 24D...Outer opening, 25...Air blowing section, 3...Combustion accelerator, 30...Upper part, 30A...Central opening, 31...Lower part, 32...Connection section, 4...Agricultural greenhouse.

Claims

1. A wood fuel combustion device, The bottom portion is formed above where the combustion space for the wood fuel is located, A portion extending upward along the axis from the bottom, the side wall portion which surrounds the combustion space from the side and has an opening on the opposite side of the bottom, A portion included in the side wall portion, which surrounds the secondary combustion region, which is the region in the combustion space where secondary combustion of the wood fuel takes place, is a secondary combustion portion, Multiple supply holes penetrating the secondary combustion section, It comprises a lower part located inside the secondary combustion section, The lower portion faces the central part of the combustion space in the secondary combustion region, and a gap surrounding the lower portion is formed between the lower portion and the secondary combustion section. The central portion refers to the region located in the center of the cross-section perpendicular to the axis in the combustion space. Combustion device.

2. A combustion apparatus according to claim 1, It further comprises an upper part located above the lower part, The upper portion has a portion facing the peripheral edge of the combustion space and a central opening surrounded by that portion. The aforementioned peripheral portion is a region that extends along the outer edge of the cross-section in the combustion space and surrounds the center of the cross-section. Combustion device.

3. A combustion apparatus according to claim 2, When viewed in the direction of the aforementioned axis, the lower portion is located inside the outer edge of the central opening of the upper portion. Combustion device.

4. A combustion apparatus according to any one of claims 1 to 3, A combustion device further comprising a blower located below the bottom and for blowing air toward the secondary combustion section.

5. A carbon dioxide application device for applying carbon dioxide to agricultural greenhouses, A combustion apparatus according to any one of claims 1 to 3, A supply unit configured to supply the combustion exhaust gas generated by the aforementioned combustion device to an agricultural greenhouse, A carbon dioxide application device equipped with [a specific feature].

6. A combustion accelerator used in a wood fuel combustion device, The upper part is a plate-like section with a central opening, The lower part is a plate-shaped portion that is positioned to face the central opening, It comprises a plurality of connecting parts that connect the upper part and the lower part, The combustion device is The bottom portion is formed above where the combustion space for the wood fuel is located, A portion extending upward along the axis from the bottom, the side wall portion which surrounds the combustion space from the side and has an opening on the opposite side of the bottom, The side wall portion includes a secondary combustion section which is a portion that surrounds a secondary combustion region, which is a space in the combustion space where secondary combustion of the wood fuel takes place, The combustion accelerating device is arranged in the combustion device such that its upper portion faces the peripheral edge of the combustion space, and its lower portion faces the central part of the combustion space below the upper portion. The aforementioned central portion is the region located in the center of the cross-section perpendicular to the axis in the combustion space, The aforementioned peripheral portion is a region that extends along the outer edge of the cross-section in the combustion space and surrounds the center of the cross-section. Combustion accelerator.

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