Solid fuel combustion apparatus

Abstract

The present application relates to a kind of solid fuel combustion device, the solid fuel combustion device can improve the combustion efficiency of solid fuel, and can increase flame temperature to high temperature.The solid fuel combustion device of the present application is composed of flame guide pipe, first combustion guide pipe, second combustion guide pipe and air supply part;Wherein, flame guide pipe is arranged in the flame advancing direction of flame chamber, and the solid fuel sent into flame chamber is burned, thereby generating flame;The outer side of flame guide pipe is provided with first air inflow chamber, and high-speed air is blown into primary combustion part by the structure that the front end (of inner diameter) of flame guide pipe gradually becomes smaller, thereby promoting combustion;The outer side of first combustion guide pipe is provided with second air inflow chamber, and high-speed air is blown into secondary combustion part by the structure that the front end (of inner diameter) of flame guide pipe gradually becomes smaller, thereby promoting combustion;Air supply part sends external air into flame chamber, first and second air inflow chamber.

Description

TECHNICAL FIELD

[0001] The present invention relates to a solid fuel combustion device, and more particularly, to a solid fuel combustion device that can improve combustion efficiency of solid fuel and can increase flame temperature to a high temperature. BACKGROUND

[0002] After sawdust, coarse bark, grass root bark, grass, branches, waste wood, sludge, household garbage, waste plastic, and various solid fuels are fed into a flame chamber, the solid fuels are ignited and combusted, thereby providing a heat source for heating of various buildings, residential heating, commercial heating, industrial heating, chemical classification or reaction of catalysts, and use in various fields requiring heating engineering, and providing a usable heat source in various fields.

[0003] However, in using the existing combustion device, a large amount of solid fuel or the like is required to be fed to the lower portion of the flame chamber, and thus, in combusting the solid fuel, incomplete combustion of the fuel can occur, thereby causing waste of the fuel and reducing thermal efficiency, and after the flame of the flame chamber heats the wall surface, heat of the wall surface can be transferred to the outside, thereby increasing heat loss, and a heat-resistant material such as a heat-resistant brick needs to be provided to the wall surface of the flame chamber, which increases manufacturing costs and occupies excessive installation space.

[0004] A heat recovery type combustion device using solid fuel disclosed in Korean Patent No. 10-0890682 invented by the inventor of the present invention is configured of a solid fuel supply device, a first combustion chamber, a second combustion chamber, and a carbon residue discharge port portion; the first combustion chamber combusts the solid fuel supplied from the supply device through a first air supply portion and a second air supply portion, combusts the solid fuel through combustion gas supplied to the lower portion of the first air supply portion, and the second air supply portion accumulates combustion gas supplied from the side in the center portion, and a cooling layer is provided to the wall surface of the combustion chamber; the second combustion chamber is provided at the upper side of the first combustion chamber, combusts the combustion gas through a third air supply portion, accumulates the combustion gas in the center portion, and performs heat recovery through a discharge port; and the carbon residue discharge port portion discharges the carbon residue combusted in the first combustion chamber. The existing heat recovery type combustion device can maximize combustion efficiency and heat recovery efficiency, but the recovery type combustion device is large in size, complex in structure, and cannot increase flame temperature to a high temperature.

[0005] Prior Art Documents cited by the inventor:

[0006] Patent Document 1: KR No. 10-1284290;

[0007] Patent Document 2: KR No. 10-1133434;

[0008] Patent Document 3: KR No. 10-1055057;

[0009] Patent Document 4: KR No. 10-0969857;

[0010] Patent Document 5: KR No. 10-0941573;

[0011] Patent Document 6: KR No. 10-0890682. SUMMARY

[0012] An object of the present application is to provide a solid fuel combustion device having a multi-stage combustion structure composed of a primary combustion section and a secondary combustion section provided in a flame advancing direction of a flame chamber in which a flame is generated when solid fuel is fed, and performing a re-combustion process in the primary and secondary combustion sections in order by the multi-stage combustion structure, whereby a heat recovery efficiency can be maximized and a flame temperature can be increased to a high temperature.

[0013] Another object of the present application is to provide a solid fuel combustion device in which a combustion efficiency can be improved even if low-pressure air is supplied to the multi-stage combustion section, and a flame guide tube of the combustion section can be prevented from being heated, whereby heat loss can be minimized and a heat recovery rate can be maximized.

[0014] The solid fuel combustion device of the present application is composed of a flame guide tube, a first combustion guide tube, a second combustion guide tube, and an air supply section; wherein the flame guide tube is provided in a flame advancing direction of a flame chamber in which a flame is generated when solid fuel is fed, the first air inflow chamber is provided outside the flame guide tube, high-speed air is blown into a primary combustion section by a structure in which an inner diameter of a front end of the flame guide tube is gradually reduced, whereby combustion is promoted, the second air inflow chamber is provided outside the first combustion guide tube, high-speed air is blown into a secondary combustion section by a structure in which an inner diameter of a front end of the flame guide tube is gradually reduced, whereby combustion is promoted, and the air supply section feeds external air into the flame chamber, the first and second air inflow chambers.

[0015] The flame guide tube is provided on a side wall of the flame chamber, a flame generated in the flame chamber is discharged outward along the flame guide tube, and is re-combusted in a primary combustion section and a secondary combustion section provided in order outside a front end of the flame guide tube.

[0016] The first combustion guide tube has a pipe body having a Venturi tube shape in which an inner diameter is gradually reduced from a first expansion tube portion to a first neck portion and then gradually increased from the first neck portion to a second expansion tube portion, and the second combustion guide tube has a pipe body having a Venturi tube shape in which an inner diameter is gradually reduced from a third expansion tube portion to a second neck portion and then gradually increased from the second neck portion to a fourth expansion tube portion.

[0017] The front end of the flame guide tube is disposed at the first neck portion of the first combustion guide tube having a smaller inner diameter, thereby providing compressed outside air to the primary combustion portion.

[0018] The front end of the first combustion guide tube is disposed at the second neck portion of the second combustion guide tube having a smaller inner diameter, thereby providing compressed outside air to the secondary combustion portion.

[0019] In the solid fuel combustion device of the present application, the flame formed by the solid fuel fed into the flame chamber is discharged from the flame guide tube, and the first and second combustion guide tubes have a diverging tube shape having an increasing inner diameter, so that more outside air can be introduced into the primary and secondary combustion portions through the neck portions of the first and second combustion guide tubes, thereby assisting the re-combustion, and the heat efficiency can be greatly improved by increasing the amount of flame formation and gradually increasing the flame temperature.

[0020] The first and second combustion guide tubes of the present application are designed to have a Venturi tube shape including a diverging tube portion, a neck portion, and a converging tube portion, thereby increasing the amount of outside air flowing into the primary and secondary combustion portions. Therefore, the air supply mechanism, such as a blower, which blows low-pressure air, can be used, and the amount of electric power consumption can be greatly reduced, thereby improving the economic efficiency.

[0021] The solid fuel combustion device of the present application can prevent overheating of the first and second combustion guide tubes and minimize heat loss by the Coanda effect in which outside air flows along the wall surface of the first and second combustion guide tubes, thereby improving the heat efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a sectional view showing the overall structure of a solid fuel combustion device according to an embodiment of the present application;

[0023] Figure 2 FIG. 2 is an enlarged view showing the first combustion guide tube and the structure of the first combustion guide tube in the solid fuel combustion device according to the present application;

[0024] Figure 3 FIG. 3 is a view showing the process of re-combustion by outside air flowing into the solid fuel combustion device according to the present application;

[0025] Figure 4 FIG. 4 is a front view showing the arrangement of the respective through-hole portions formed in the flame chamber and the first and second combustion guide tubes of the solid fuel combustion device according to the present application.

[0026] Explanation of reference numerals in the attached drawings: 10, flame chamber; 11, first through-hole; 12, flame guide tube; 20, first combustion guide tube; 20a, first expansion tube; 20b, first neck; 20c, second expansion tube; 21, second through-hole; 22, primary combustion section; 24, first air inlet chamber; 30, second combustion guide tube; 30a, third expansion tube; 30b, second neck; 30c, fourth expansion tube; 31, third through-hole; 32, secondary combustion section; 34, second air inlet chamber; 40, air supply section; 42, air supply guide chamber. Detailed Implementation

[0027] The preferred embodiments of the present invention will now be described in detail. In describing the present invention, if a detailed description of a well-known function or structure does not contribute to the explanation of the main idea of ​​the present invention, the detailed description of that well-known function or structure may be omitted.

[0028] The solid fuel combustion device of the present invention has a multi-stage combustion section, which is arranged in the flame advance direction of the flame chamber that generates a flame when solid fuel is introduced for combustion. By sequentially performing the re-combustion process of the combustion gases, the combustion efficiency can be greatly improved and the flame temperature can be increased to a high temperature. The multi-stage combustion section refers to a combustion section composed of at least a primary combustion section and a secondary combustion section. The multi-stage combustion section of the present invention refers to a combustion section composed of a primary combustion section and a secondary combustion section.

[0029] like Figures 1-4 As shown, the solid fuel combustion device of the present invention comprises a flame chamber 10, a flame guide tube 12, a first combustion guide tube 20, a second combustion guide tube 30, and an air supply unit 40. The flame chamber 10 burns the supplied solid fuel to generate a flame. A flame guide pipe 12 is positioned in the flame propagation direction of the flame chamber 10. A first air inlet chamber 24 is located outside the flame guide pipe 12. High-speed air is blown into the primary combustion section 22 through the gradually decreasing inner diameter of the front end of the flame guide pipe 12, thereby promoting combustion. The flame guide pipe 12 is designed in a Venturi tube shape. A second air inlet chamber 34 is located outside the first combustion guide pipe 20. High-speed air is blown into the secondary combustion section 32 through the gradually decreasing inner diameter of the front end of the flame guide pipe 12, thereby promoting combustion. The second combustion guide pipe 30 is designed in a Venturi tube shape. An air supply section 40 supplies external air to the flame chamber 10, the first air inlet chamber 24, and the second air inlet chamber 34.

[0030] The flame chamber 10 ignites and burns the solid fuel, thereby generating a flame. To supply the solid fuel into the flame chamber 10, a fuel supply part (not shown) is provided at one side of the flame chamber 10, whereby the solid fuel can be continuously supplied.

[0031] In the preferred embodiment, the flame chamber 10 is designed in a cylindrical shape, whereby the outside air supplied into the flame chamber 10 is circulated along the inner wall surface of the cylindrical flame chamber, thereby improving the efficiency of contact between the outside air and the combustion gas generated when the solid fuel is burned, and promoting the fuel gasification efficiency.

[0032] The flame guide pipe 12 is a structure in which the side wall of the flame chamber 10 is extended in a pipe shape for a certain length, and the flame generated in the flame chamber 10 is discharged outward along the flame guide pipe 12 and is burned again in the primary combustion part 22 and the secondary combustion part 32 provided in sequence outside the front end of the flame guide pipe 12.

[0033] The first combustion guide pipe 20 has a pipe body designed in a Venturi tube shape in which the inner diameter is gradually reduced from the first expanded pipe part 20a to the first neck part 20b and then gradually increased from the first neck part 20b to the second expanded pipe part 20c, and the pipe body is provided outside the flame guide pipe 12, and the front end of the flame guide pipe 12 is provided near the first neck part 20b of the first combustion guide pipe 20 in which the inner diameter is reduced. The outside air flowing into the first air inflow chamber 24 is rapidly sprayed toward the primary combustion part 22 through the first neck part 20b of the first combustion guide pipe 20 in which the inner diameter is gradually reduced, whereby the air flowing in the direction in which the flame of the primary combustion part 22 advances can be increased, a strong suction force in the direction in which the flame advances can be formed, and the temperature of the flame can be increased to a high temperature by the strong straight advancement of the flame and the increased air.

[0034] In addition, the first combustion guide pipe 20 has a pipe body in which the inner diameter is gradually reduced from the first expanded pipe part 20a to the first neck part 20b and then gradually increased from the first neck part 20b to the second expanded pipe part 20c, and the Coanda Effect of the outside air flowing along the wall surface of the pipe body can prevent overheating of the first combustion guide pipe 20 and can improve the thermal efficiency.

[0035] The second combustion guide pipe 30 has a pipe body designed in a Venturi tube shape in which the inner diameter gradually decreases from the third expansion pipe portion 30a to the second neck portion 30b and then gradually increases from the second neck portion 30b to the fourth expansion pipe portion 30c; the pipe body is arranged outside the first combustion guide pipe 20, and the front end of the first combustion guide pipe 20 is arranged near the second neck portion 30b of the second combustion guide pipe 30 in which the inner diameter is small. The external air flowing into the second air inflow chamber 34 can be rapidly jetted toward the secondary combustion portion 32 through the second neck portion 30b of the second combustion guide pipe 30 in which the inner diameter gradually decreases, so that the air flowing along the flame advancing direction of the secondary combustion portion 32 can be increased, and a strong suction force along the flame advancing direction can be formed, and the flame temperature can be increased to a higher temperature than that of the primary combustion portion 22 through the strong straightness of the flame and the increased air.

[0036] In addition, the Conda effect of the external air flowing along the wall surface of the second combustion guide pipe 30 in which the inner diameter gradually expands from the third expansion pipe portion 30a and the second neck portion 30b to the fourth expansion pipe portion 30c can prevent overheating of the second combustion guide pipe 30 and improve the thermal efficiency.

[0037] The air supply portion 40 generally refers to a blower or the like for blowing low-pressure air, and the external air supplied by the air supply portion 40 is attached to the outer peripheral surface of the second combustion guide pipe 30 and is supplied into the air supply guide chamber 42 constituting an internal space; each of the first through hole portion 11, the second through hole portion 21, and the third through hole portion 31 in the air supply guide chamber 42 is in communication with the flame chamber 10 and the first air inflow chamber 24 and the second air inflow chamber 34; and the air blown into the air supply guide chamber 42 from the air supply portion 40 can be supplied into the flame chamber 10 and the first air inflow chamber 24 and the second air inflow chamber 34 through each of the first through hole portion 11, the second through hole portion 21, and the third through hole portion 31.

[0038] The number of the first through hole portions 11 introduced into the flame chamber 10 is plural, and the plural first through hole portions 11 are arranged on the wall surface of the cylindrical flame chamber 10 with reference to the axial direction. It is preferable that the second through hole portions 21 introduced into the first air inflow chamber 24 and the third through hole portions 31 introduced into the second air inflow chamber 34 are arranged in a form in which an error in the amount of air inflow is not caused.

[0039] A third combustion guide pipe (not shown) can be further arranged outside the second combustion guide pipe 30, and even if a solid fuel combustion device having such a multi-stage combustion structure exists, it belongs to the range defined in the present application.

[0040] As described above, the present application continuously feeds solid fuel into the flame chamber 10 by the fuel supply unit, thereby boosting combustion and flame generation. When the solid fuel in the flame chamber 10 is combusted, external air is introduced into the flame chamber 10 from the air supply unit 40, thereby increasing the combustion effect and obtaining combustion gasification and discharging the flame from the flame guide pipe 12.

[0041] The flame of the flame chamber 10 can be discharged in the flame advancing direction of the flame guide pipe 12. The primary combustion unit 22 located near the front end of the flame guide pipe 12 can introduce more external air through the first neck portion 20b of the first combustion guide pipe 20 and form a strong suction force in the flame advancing direction, and by the strong straight advancement of the flame and the increased air, combustion can be boosted and the flame temperature can be increased to a high temperature.

[0042] The flame in the primary combustion unit 22 can form a flame advancing direction directed to the front end of the first combustion guide pipe 20. The secondary combustion unit 32 located near the front end of the first combustion guide pipe 20 can introduce more external air through the second neck portion 30b of the second combustion guide pipe 30 and form a strong suction force in the flame advancing direction, and by the strong straight advancement of the flame and the increased air, secondary combustion can be boosted and the combustion efficiency can be maximized. The flame temperature in the secondary combustion unit 32 can be higher than that in the primary combustion unit 22.

[0043] In the solid fuel combustion device of the present application, the flame formed in the flame chamber 10 is discharged from the flame guide pipe 12. The first combustion guide pipe 20 and the second combustion guide pipe 30 have an expanding pipe shape with gradually increasing inner diameters compared to the flame guide pipe 12. More external air can be introduced through the first neck portion 20b of the first combustion guide pipe 20 and the second neck portion 30b of the second combustion guide pipe 30. By increasing the amount of flame formation and gradually increasing the flame temperature, the thermal efficiency can be greatly improved.

[0044] The first combustion guide pipe 20 and the second combustion guide pipe 30 of the present application are designed in a Venturi tube shape, thereby increasing the external air flowing into the primary combustion unit 22 and the secondary combustion unit 32. Therefore, as the air supply mechanism of the air supply unit 40, an air blower or the like that blows low-pressure air can be used, and the electric power consumption can be greatly reduced. By the Coanda effect of the external air flowing along the pipe wall surface of the first combustion guide pipe 20 and the second combustion guide pipe 30, the first combustion guide pipe 20 and the second combustion guide pipe 30 can be prevented from overheating, and the heat loss can be minimized, thereby improving the thermal efficiency.

[0045] The technical solutions of the present application are described in detail above with reference to the above-described embodiments, but the present application can also include various modified embodiments within the technical scope of the present application and other than the above-described embodiments.

Claims

1. A solid fuel burning apparatus, characterized by: The solid fuel combustion device is composed of a flame guide pipe (12), a first combustion guide pipe (20), a second combustion guide pipe (30) and an air supply part (40). The flame guide pipe (12) is arranged in the flame advancing direction of a flame chamber (10) which burns the incoming solid fuel to generate a flame. The outer side of the flame guide pipe (12) is provided with a first air inflow chamber (24) between the flame guide pipe (12) and the first combustion guide pipe (20), and high-speed air is blown into a primary combustion part (22) through the gradually decreasing inner diameter of the front end of the flame guide pipe (12) to promote combustion. The outer side of the first combustion guide pipe (20) is provided with a second air inflow chamber (34) between the first combustion guide pipe (20) and the second combustion guide pipe (30), and high-speed air is blown into a secondary combustion part (32) through the gradually decreasing inner diameter of the front end of the flame guide pipe (12) to promote combustion. The air supply part (40) sends external air into the flame chamber (10), the first air inflow chamber (24) and the second air inflow chamber (34). The external air provided by the air supply part (40) adheres to the outer peripheral surface of the second combustion guide pipe (30) and is sent into a blast guide chamber (42) which constitutes an internal space. The blast guide chamber (42) is provided with a first through hole part (11) of the flame chamber (10), a second through hole part (21) of the first combustion guide pipe (20) and a third through hole part (31) of the second combustion guide pipe (30). The first through hole part (11), the second through hole part (21), the third through hole part (31), the flame chamber (10), the first air inflow chamber (24) and the second air inflow chamber (34) are in a communicating state. The external air blown into the blast guide chamber (42) from the air supply part (40) is sent into the second air inflow chamber (34) through the third through hole part (31), and then is sent into the flame chamber (10) through the first through hole part (11) and into the first air inflow chamber (24) through the second through hole part (21).

2. The solid fuel burning device of claim 1, wherein: The flame guide pipe (12) is arranged on the side wall of the flame chamber (10), and the flame generated in the flame chamber (10) is discharged outward along the flame guide pipe (12) and is combusted again in the primary combustion part (22) and the secondary combustion part (32) arranged in sequence on the outer side of the front end of the flame guide pipe (12).

3. The solid fuel burning device of claim 1, wherein: The first combustion guide pipe (20) has a pipe body designed in a shape of a Venturi tube in which an inner diameter gradually decreases from a first flared portion (20a) to a first neck portion (20b) and then gradually increases from the first neck portion (20b) to a second flared portion (20c), and the second combustion guide pipe (30) has a pipe body designed in a shape of a Venturi tube in which an inner diameter gradually decreases from a third flared portion (30a) to a second neck portion (30b) and then gradually increases from the second neck portion (30b) to a fourth flared portion (30c).

4. The solid fuel burning device of claim 1, wherein: The front end of the flame guide pipe (12) is provided at the first neck portion (20b) of the first combustion guide pipe (20) in which the inner diameter is reduced, thereby supplying the primary combustion portion (22) with the compressed outside air.

5. The solid fuel burning device of claim 1, wherein: The front end of the first combustion guide pipe (20) is provided at the second neck portion (30b) of the second combustion guide pipe (30) in which the inner diameter is reduced, thereby supplying the secondary combustion portion (32) with the compressed outside air.

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