Combustor

Abstract

To provide a combustion device that can improve the environment around the part where exhaust gas is discharged. [Solution] The combustor 100 includes a first tubular section 10 configured such that fuel supplied into the pipe from one end a1 flows out at the other end b1; a second tubular section 20 containing the first tubular section 10, configured such that air supplied into the pipe from one end a2 is used for fuel combustion and exhaust gas generated by combustion flows out at the other end b2; a third tubular section 30 containing the second tubular section 20, configured such that exhaust gas flowing out from the other end b2 moves toward one end a3; a fourth tubular section 40 configured such that exhaust gas flowing out from one end a3 of the third tubular section 30 moves upward; a fuel supply section F for supplying fuel; a first air supply section A1 for supplying combustion air; and a water supply section W for supplying water toward the pipe of the fourth tubular section 40.

Description

Technical Field

[0001] The present invention relates to a combustor that burns fuel.

Background Art

[0002] As shown in Patent Document 1, a single-end burner may be used as a combustor in industrial furnaces such as heating furnaces and heat treatment furnaces. The burner includes a radiant tube, an air pipe, and a gas pipe. The radiant tube is configured such that its tip portion is closed.

[0003] Inside the radiant tube, the air pipe is provided coaxially. Inside the air pipe, the gas pipe is provided coaxially. The tip of the gas pipe is configured to serve as a burner nozzle. Fuel is combusted at the burner nozzle, and exhaust gas is generated by the combustion. The high-temperature exhaust gas heats the air used for combustion before the combustion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of Invention

[0005] According to the technique of Patent Document 1 described above, combustion air can be heated with high-temperature exhaust gas. That is, part of the heat of the exhaust gas can be utilized. On the other hand, the exhaust gas after the heat is utilized flows out of the system of the combustor. The temperature of the flowing-out exhaust gas is often high. In addition, CO2 and N2 constituting the exhaust gas flow out as they are. From the above, in the combustor, there is room for improving the environment around the portion where the exhaust gas flows out.

[0006] In view of the above, an object of the present invention is to provide a combustor capable of improving the environment around the portion where exhaust gas flows out in the combustor. [Means for solving the problem]

[0007] The technical means of the present invention for solving this technical problem is characterized by the following points. The combustor of the present invention is a combustor for burning fuel. The combustor of the present invention comprises: a first tubular section having one end and the other end defined and formed in a tubular shape, configured such that the fuel supplied into the tube from the one end side flows out at the other end side; a second tubular section having one end and the other end defined and formed in a tubular shape, containing the first tubular section, and outside the first tubular section, air supplied into the tube from the one end side is used for the combustion of the fuel, and exhaust gas produced by the combustion flows out at the other end side; and a second tubular section having one end and the other end defined and formed in a tubular shape, containing the second tubular section, and outside the second tubular section, The device comprises: a third tubular section configured such that exhaust gas flowing out from the other end of the tubular section moves toward the one end and flows out at the one end; a fourth tubular section formed in a tubular shape and positioned outside the third tubular section, configured such that exhaust gas flowing out from the one end of the third tubular section moves in a direction away from the third tubular section; a fuel supply unit that supplies the fuel from the one end toward the inside of the first tubular section; a first air supply unit that supplies the air used for combustion of the fuel from the one end toward the inside of the second tubular section; and a water supply unit that supplies water toward the inside of the fourth tubular section.

[0008] In the combustion device of the present invention, the water supply unit has a defined water outlet, is formed in a tubular shape, and is configured such that the water supplied into the tube flows out at the outlet, and also includes a fifth tubular unit arranged inside the fourth tubular unit.

[0009] In the combustor of the present invention, the fifth tubular portion is arranged such that its outlet faces in a direction away from the third tubular portion within the tube of the fourth tubular portion.

[0010] In the combustor of the present invention, the fifth tubular portion includes a portion made of copper as its material.

[0011] The combustor of the present invention includes a second air supply unit that supplies air, separate from the air used for the combustion of the fuel, toward the inside of the fourth tubular section, and which is used to promote the movement of the exhaust gas.

[0012] The combustor of the present invention includes a third air supply unit that supplies air, separate from the air used for the combustion of the fuel, toward the inside of the second tubular section, and which is used to suppress the movement of the exhaust gas. [Effects of the Invention]

[0013] According to the present invention, water can be added to the exhaust gas moving inside the fourth tubular section. This allows the temperature of the exhaust gas to be lowered. Furthermore, the water mixes with the CO2 and N2 in the exhaust gas, enabling purification. As a result, the environment around the fourth tubular section from which the exhaust gas flows can be improved. [Brief explanation of the drawing]

[0014] [Figure 1] This is a cross-sectional view of a combustor according to the first embodiment of the present invention, taken from the side. [Figure 2] Figure 1 is a front view of the combustor. [Figure 3] Figure 1 is a cross-sectional view of the combustor from a side view, and is an enlarged view of the vicinity of one end. [Figure 4] Figure 1 is a cross-sectional view of the fourth tubular section of the combustor, taken from a side view, and is an enlarged view of the area near the water supply section. [Figure 5] Figure 1 is a cross-sectional view from above of the fourth tubular section of the combustor, and is an enlarged view of the area near the water supply section. [Figure 6] Figure 1 is a rear view of the combustor, and is an enlarged view of the vicinity of one end, including the third air supply section. [Figure 7] This is a cross-sectional view of a combustor according to a second embodiment of the present invention, taken from the side. [Figure 8]It is a front view of a single-end burner in the prior art, and is a diagram for explaining the configuration corresponding to Figure 2. [Modes for Carrying Out the Invention]

[0015] Hereinafter, each embodiment of the present invention will be described based on the drawings.

[0016] [First Embodiment] As shown in Figure 1 and Figure 2, a combustor 100 according to the first embodiment of the present invention is a combustor that burns fuel. Figure 1 is a cross-sectional view (vertical cross-sectional view in the up-down direction) of the combustor 100 from a side view. Figure 2 is a front view of the combustor 100. In the combustor 100, the supplied fuel and air are caused to undergo a combustion reaction. The fuel may be any combustible gas including, for example, methane, propane and the like, and is not limited thereto.

[0017] In the combustor 100, a first axis K1 and a second axis K2 are defined. The first axis K1 extends along the front-rear direction. The second axis K2 extends along the up-down direction while intersecting the first axis K1. For example, when the first axis K1 is along the horizontal direction, the second axis K2 may be orthogonal to the rear end side of the first axis K1 and along the vertical direction. The combustor 100 as a whole is along the first axis K1 and the second axis K2, and may be formed in a substantially L shape in a side view.

[0018] The combustor 100 may be, for example, a single-end burner. In the combustor 100, exhaust gas is generated by combustion. As illustrated by the arrow, the exhaust gas turns back at the front end of the first axis K1 inside the combustor 100 and heads toward the rear end. The exhaust gas that has moved along the first axis K1 flows out of the combustor 100 along the second axis K2.

[0019] The combustor 100 is configured to enable heat exchange between the exhaust gas and combustion air. The temperature of the combustion air rises due to heat exchange with the exhaust gas. That is, the heat of the exhaust gas is utilized to preheat the combustion air. Hereinafter, the configuration of the combustor 100 will be described in detail.

[0020] The combustor 100 includes a first tubular section 10, a second tubular section 20, a third tubular section 30, a fourth tubular section 40, a fuel supply section F, a first air supply section A1, a second air supply section A2, a third air supply section A3, and a water supply section W. The water supply section W includes a fifth tubular section 50.

[0021] The first tubular section 10, the second tubular section 20, and the third tubular section 30 may each be formed in the shape of a circular tube, for example. The first tubular section 10 is contained within the tube of the second tubular section 20, and the second tubular section 20 is contained within the tube of the third tubular section 30. That is, the outer diameter of the first tubular section 10 is smaller than the inner diameter of the second tubular section 20, and the outer diameter of the second tubular section 20 is smaller than the inner diameter of the third tubular section 30. The first tubular section 10, the second tubular section 20, and the third tubular section 30 are arranged coaxially such that the first axis K1 is at the center.

[0022] The first tubular section 10, the second tubular section 20, and the third tubular section 30 each have a defined end and other end. The end a1 of the first tubular section 10, the end a2 of the second tubular section 20, and the end a3 of the third tubular section 30 correspond to the rear side of the first axis K1. The other end b1 of the first tubular section 10, the other end b2 of the second tubular section 20, and the other end b3 of the third tubular section 30 correspond to the front side of the first axis K1.

[0023] In the first axis K1, the other end b1 of the first tubular section 10 is located further back than the other end b2 of the second tubular section 20. The other end b2 of the second tubular section 20 is located further back than the other end b3 of the third tubular section 30. That is, the length of the first tubular section 10 is shorter than the length of the second tubular section 20, and the length of the second tubular section 20 is shorter than the length of the third tubular section 30.

[0024] The first tubular section 10 is configured such that fuel supplied into the tube from one end a1 flows out from the other end b1. The fuel flows through the tube of the first tubular section 10 from the rear to the front of the first shaft K1. The other end b1 of the first tubular section 10 is an open end. The other end b1 may be, for example, a burner opening. In this case, a flame is steadily formed outside the first tubular section 10 and near the other end b1.

[0025] The second tubular section 20 is located outside the first tubular section 10 and is configured so that air supplied into the pipe from one end a2 is used for fuel combustion. This air corresponds to combustion air. The combustion air flows through the pipe of the second tubular section 20 from the rear to the front of the first shaft K1.

[0026] At this time, the circulating combustion air comes into contact with the inner surface of the second tubular section 20. As a result, the combustion air is heated by convective and radiant heat transfer from the inner surface of the second tubular section 20. The heated combustion air is used for fuel combustion inside the second tubular section 20, near the other end b1 of the first tubular section 10.

[0027] The second tubular section 20 is configured so that exhaust gas generated by combustion flows out at the other end b2. The exhaust gas flows through the tube of the second tubular section 20 from the flame at the other end b1 toward the front of the first axis K1. The other end b2 of the second tubular section 20 is an open end. Therefore, the exhaust gas flows out from the other end b2 toward the outside of the second tubular section 20.

[0028] The third tubular section 30 is configured to allow exhaust gas flowing out from the other end b2 of the second tubular section 20 to move toward the one end a3, located outside the second tubular section 20. The third tubular section 30 is configured to allow the exhaust gas to flow out at the one end a3 after moving as described above.

[0029] The other end b3 of the third tubular section 30 is a closed end. That is, the inside of the third tubular section 30 exhibits a dead-end structure at the other end b3. Therefore, the exhaust gas flowing out from the other end b2 of the second tubular section 20 moves toward the other end b3 of the third tubular section 30. After being reversed at the other end b3, the exhaust gas flows toward the rear of the first axis K1, through the inside of the third tubular section 30 and on the outside of the second tubular section 20. That is, the exhaust gas moves toward the one end a3 side.

[0030] At this time, the moving exhaust gas comes into contact with the inner surface of the third tubular section 30, and the third tubular section 30 itself is heated. As a result, the outside is heated by radiant heat transfer from the outer surface of the third tubular section 30. Simultaneously, the moving exhaust gas comes into contact with the outer surface of the second tubular section 20. As a result, the exhaust gas is cooled by convective and radiant heat transfer to the outer surface of the second tubular section 20. The heat lost from the cooling of the exhaust gas is used to heat the combustion air via the second tubular section 20.

[0031] In the first shaft K1, one end a1 of the first tubular section 10, one end a2 of the second tubular section 20, and one end a3 of the third tubular section 30 are closed ends. A fourth tubular section 40 is positioned on the side of one end a3 of the third tubular section 30. The inside of the fourth tubular section 40 is in communication with the inside of the third tubular section 30 so as to form a passage for exhaust gas.

[0032] The fourth tubular portion 40 may, for example, be formed in the shape of a circular tube. The fourth tubular portion 40 is arranged coaxially with the second axis K2 as its center. The fourth tubular portion 40 is connected to one end a3 of the third tubular portion 30. The fourth tubular portion 40 extends upward from the third tubular portion 30. That is, the fourth tubular portion 40 extends in a direction away from the third tubular portion 30 (in this embodiment, in a direction from the bottom to the top).

[0033] The fourth tubular section 40 comprises an upstream section 41, a midstream section 42, and a downstream section 43. The upstream section 41, the midstream section 42, and the downstream section 43 are arranged in this order along the direction from bottom to top. The upstream section 41, the midstream section 42, and the downstream section 43 are arranged coaxially with respect to the second axis K2.

[0034] The upstream section 41 is connected to the upper side of the third tubular section 30, at one end a3 of the third tubular section 30. The upstream section 41 may have flanges at both ends and be in the shape of a straight pipe. The first air supply section A1 and the water supply section W are installed in the upstream section 41.

[0035] The first air supply unit A1 supplies air used for fuel combustion (combustion air) into the pipe of the second tubular section 20 from one end a2. In this embodiment, the first air supply unit A1 is equipped with an air passage consisting of piping or the like for circulating the combustion air. This passage is configured to guide the combustion air through the pipe of the upstream section 41 to one end a2 of the second tubular section 20. Details of the water supply unit W will be described later.

[0036] The midstream section 42 is interposed between the upstream section 41 and the downstream section 43. The midstream section 42 may be configured such that its opening area is narrowed at its upper and lower ends. In this case, the midstream section 42 widens in diameter near the middle of its vertical axis. A second air supply section A2 is installed in the widened portion of the midstream section 42.

[0037] The second air supply unit A2 supplies air used to promote the movement of exhaust gas into the pipe of the fourth tubular section 40. This air is different from the combustion air. In this embodiment, the second air supply unit A2 is equipped with an air passage consisting of piping or the like for circulating the air. This passage is configured to guide the air upward coaxially with the second axis K2 within the pipe of the middle section 42.

[0038] The downstream section 43 is configured such that the degree of diameter expansion increases towards the upper side. The uppermost end of the downstream section 43 is an opening, and its opening area is the largest in the downstream section 43. The downstream section 43 may, for example, exhibit a diffuser structure.

[0039] The upstream section 41, the midstream section 42, and the downstream section 43 are connected to each other, and a passage for exhaust gas is formed within these pipes. That is, the exhaust gas flowing out from the third tubular section 30 flows through the upstream section 41, the midstream section 42, and the downstream section 43 in this order. Finally, the exhaust gas flows out of the system through the opening at the uppermost end of the downstream section 43.

[0040] Here, within the pipe of the middle section 42, air is supplied upward from the second air supply section A2. As a result, within the pipe of the fourth tubular section 40, the exhaust gas is attracted to the airflow. That is, the Bernoulli effect occurs, which promotes the movement of the exhaust gas.

[0041] As shown in Figure 3, fuel and combustion air are supplied to the combustor 100. The fuel supply unit F supplies fuel into the pipe of the first tubular section 10 from one end a1. In this embodiment, the fuel supply unit F is equipped with a fuel passage consisting of piping or the like for circulating fuel. This passage is configured to guide the fuel from near the rear end of the combustor 100 to one end a1 of the first tubular section 10.

[0042] The exhaust gas generated by the combustion of the fuel flows through the third tubular section 30, outside the second tubular section 20. This exhaust gas moves toward one end a3, and then flows upward toward the fourth tubular section 40. On the other hand, the combustion air moves through the upstream section 41 toward one end a2 of the second tubular section 20.

[0043] At this time, the moving combustion air is heated by the exhaust gas through the passage. Simultaneously, the moving exhaust gas is cooled by the combustion air through the same passage. That is, near the outlet of the third tubular section 30 and near the inlet of the fourth tubular section 40, the heat that is lost when the exhaust gas is cooled is used to heat the combustion air.

[0044] As shown in Figures 4 and 5, the water supply unit W is installed upstream 41 of the fourth tubular section 40. The water supply unit W supplies water into the pipe of the fourth tubular section 40. The water supply unit W has an inlet W1 and a fifth tubular section 50 and may be connected to a storage unit W2 installed outside the combustor 100.

[0045] The storage section W2 is a container capable of storing water. The lower part of the storage section W2 and the inlet section W1 are connected by a hose or the like. This hose serves as a water passage. The inlet section W1 is installed on the rear side of the upstream section 41 of the fourth tubular section 40. The inlet section W1 is designed to receive water from the storage section W2.

[0046] The fifth tubular section 50 may be formed, for example, in the shape of a circular tube. The fifth tubular section 50 is located inside the tube of the fourth tubular section 40. The fifth tubular section 50 may be arranged coaxially with the fourth tubular section 40 with respect to the second axis K2. That is, the outer diameter of the fifth tubular section 50 is smaller than the inner diameter of the fourth tubular section 40. More specifically, for example, if the fourth tubular section 40 is made of a pipe conforming to JIS standard 50A, it is preferable that the fifth tubular section 50 be configured to have a diameter of 8φ. If the diameter of the fifth tubular section 50 is increased, for example from 8φ to 10φ, there is a risk that the fourth tubular section 40 will be excessively cooled. From this viewpoint, the gap between the fourth tubular section 40 and the fifth tubular section 50 is adjusted to be appropriate.

[0047] In the fifth tubular section 50, a water outlet 51 is defined. The outlet 51 is positioned within the fourth tubular section 40, facing in a direction away from the third tubular section 30 (upward). That is, in this embodiment, the outlet 51 is located at the upper end of the fifth tubular section 50, within the middle section 42. The outlet 51 may be, for example, a circular opening.

[0048] The lower side of the fifth tubular section 50 is connected to the inlet section W1. Therefore, water received at the inlet section W1 is guided toward the outlet 51 of the fifth tubular section 50. The water (water vapor) flows upward from the outlet 51. Water (water vapor) is supplied from the storage section W2 in proportion to the amount of water (water vapor) flowing out from the outlet 51. This is because the water moves so that the water level H in the fifth tubular section 50 matches the water level in the storage section W2. The water inside the tube of the fifth tubular section 50 boils due to the heat from the exhaust gas. As it boils, the water inside the tube of the fifth tubular section 50 is pushed toward the outlet 51. As a result, liquid water and water vapor flow out from the outlet 51. The flowing water adheres to the inner wall surface of the fourth tubular section 40. At this time, the water evaporates instantaneously due to the heat from the fourth tubular section 40. In other words, water vapor is supplied into the fourth tubular section 40 from both the outlet 51 and the inner wall surface. As a result, water mixes with the CO2 and N2 in the exhaust gas within the fourth tubular section 40, enabling purification. This exhaust gas purification is based on the following findings. Consider the case where fuel is burned in a stove different from the combustor 100 of this embodiment. Often, a kettle filled with water is placed on this stove. In this case, the exhaust gas from the stove moves upward. On the other hand, the water in the kettle is heated by the stove, and water vapor flows out. This water vapor mixes with the CO2 and N2 in the exhaust gas, enabling purification.

[0049] The fifth tubular section 50 may include a portion made of copper. Alternatively, a metal with high thermal conductivity and corrosion resistance may be used instead of copper. The copper portion may comprise, for example, the entire fifth tubular section 50 or only a portion of it. This is to enhance the thermal conductivity of the fifth tubular section 50, thereby efficiently transferring heat from the exhaust gas to the water. This ensures a reliable supply of water vapor within the fourth tubular section 40.

[0050] As shown in Figures 1 and 6, the third air supply unit A3 supplies air used to suppress the movement of exhaust gas into the pipe of the second tubular section 20. This air is different from the combustion air. In this embodiment, the third air supply unit A3 is equipped with an air passage A31, which consists of piping or the like for circulating this air.

[0051] The passage A31 is configured to guide the air forward parallel to the first axis K1 within the pipe of the second tubular section 20. The passage A31 may be interposed between the outside of the first tubular section 10 and the inside of the second tubular section 20. The air inlet in the passage A31 may be located, for example, at the rear end of the combustor 100 and slightly below the first axis K1.

[0052] This allows air from the third air supply unit A3 to be added to the exhaust gas. As a result, the temperature of the exhaust gas can be lowered in accordance with the addition of air. In addition, the Bernoulli effect in the fourth tubular section 40 can be suppressed in accordance with the addition of air. That is, the movement of the exhaust gas is suppressed.

[0053] [Effects of the Embodiment] As described above, the combustor 100 according to the first embodiment of the present invention is a combustor for burning fuel, comprising: a first tubular section 10 having one end a1 and the other end b1 defined and formed in a tubular shape, configured such that the fuel supplied into the tube from the one end a1 side flows out at the other end b1 side; a second tubular section 20 having one end a2 and the other end b2 defined and formed in a tubular shape, containing the first tubular section 10 inside the tube, and outside the first tubular section 10, air supplied into the tube from the one end a2 side is used for the combustion of the fuel, and exhaust gas generated by the combustion flows out at the other end b2 side; and a second tubular section 20 having one end a3 and the other end b3 defined and formed in a tubular shape, containing the second tubular section 20 inside the tube, The tubular section 20 includes a third tubular section 30 configured such that exhaust gas flowing out from the other end b2 of the second tubular section 20 moves toward the one end a3 and flows out at the one end a3; a fourth tubular section 40 formed in a tubular shape and positioned outside the third tubular section 30, configured such that exhaust gas flowing out from the one end a3 of the third tubular section 30 moves in a direction away from the third tubular section 30; a fuel supply unit F that supplies the fuel from the one end a1 towards the inside of the first tubular section 10; a first air supply unit A1 that supplies the air used for combustion of the fuel from the one end a2 towards the inside of the second tubular section 20; and a water supply unit W that supplies water towards the inside of the fourth tubular section 40.

[0054] According to this, water can be added to the exhaust gas moving inside the fourth tubular section 40. Therefore, the temperature of the exhaust gas can be lowered. Furthermore, the water mixes with the CO2 and N2 in the exhaust gas, enabling purification. As a result, the environment around the fourth tubular section 40 from which the exhaust gas flows can be improved. Also, as shown in Figure 8, in a conventional single-end burner, the upstream section 41 of the fourth tubular section 40 in this first embodiment is replaced by an "air heating section," and a water supply section W is not provided. In a conventional air heating section, there is no cooling by the water supply section W, and the combustion air is heated by the high-temperature exhaust gas. In this case, the combustion air also becomes hot, and the air density decreases. More specifically, for example, if the air temperature before heating is 20°C and the air temperature after heating is 80°C, the respective air densities will be 1.166 and 0.968. The standard air flow rate required for one combustor is 47.6 m³. 3 If it is / h, considering the air density mentioned above, the airflow rate of the air before heating (at a temperature of 20°C) is 55.5016 m³. 3 / h(=1.166*47.6m 3 / h) · Airflow rate of heated air (temperature 80℃): 46.0768 m 3 / h(=0.968*47.6m 3 The values ​​( / h) are calculated for each case. In this case, the difference in airflow is 9.4248 m 3 / h(=55.5016m 3 / h―46.0768m 3 This results in a difference of 1 / h. In other words, there will be an air shortage according to this difference. As a result, in conventional single-ended burners, the combustion air is heated to a high temperature, which can lead to a shortage of air necessary for combustion, resulting in problems such as incomplete combustion and soot production. In contrast, the combustor 100 of this first embodiment is provided with a water supply unit W. Therefore, the above-mentioned problems can be solved.

[0055] In the combustor 100, the water supply unit W is formed in a tubular shape with a defined water outlet 51, and is configured such that the water supplied into the tube flows out at the outlet 51. It also includes a fifth tubular unit 50 located inside the fourth tubular unit 40.

[0056] According to this, water can be supplied into the tube of the fourth tubular section 40 via the fifth tubular section 50. By adjusting the position of the outlet 51 of the fifth tubular section 50, the water can be directed in a desired direction. Therefore, for example, the position of the outlet 51 can be adjusted to direct it towards a part where cooling should be promoted, or away from a part where cooling should be suppressed.

[0057] In the combustor 100, the fifth tubular section 50 is positioned such that its outlet 51 faces in a direction away from the third tubular section 30 within the tube of the fourth tubular section 40.

[0058] According to this, the arrival of water in the third tubular section 30 is suppressed, and the cooling of the vicinity of the third tubular section 30 is suppressed. Therefore, the heating of the combustion air by the exhaust gas is not hindered by water. On the other hand, the exhaust gas flowing out from the fourth tubular section 40 can be reliably cooled. Thus, heating of the combustion air and cooling of the exhaust gas can be appropriately achieved simultaneously.

[0059] In the combustor 100, the fifth tubular portion 50 includes a portion made of copper as its material.

[0060] According to this, the heat conductivity of the fifth tubular section 50 is increased, allowing heat to be efficiently transferred from the exhaust gas to the water. Therefore, water vapor can be reliably supplied within the fourth tubular section 40.

[0061] The combustor 100 includes a second air supply unit A2 that supplies air, separate from the air used for the combustion of the fuel, toward the inside of the fourth tubular section 40, and is used to promote the movement of the exhaust gas.

[0062] According to this, air is supplied from the second air supply unit A2 into the pipe of the fourth tubular section 40, and the exhaust gas can be attracted to the flow of this air. The Bernoulli effect can be generated inside the pipe of the fourth tubular section 40, thereby promoting the movement of the exhaust gas.

[0063] The combustor 100 includes a third air supply unit A3 that supplies air, separate from the air used for burning the fuel, toward the inside of the second tubular section 20, and is used to suppress the movement of the exhaust gas.

[0064] According to this, air from the third air supply unit A3 can be added to the exhaust gas. As a result, the temperature of the exhaust gas can be lowered in accordance with the addition of air. In addition, the Bernoulli effect in the fourth tubular section 40 can be suppressed in accordance with the addition of air. That is, the movement of the exhaust gas is suppressed.

[0065] [Second Embodiment] Next, a second embodiment of the present invention will be described.

[0066] As shown in Figure 7, the combustor 100 according to the second embodiment of the present invention differs from the combustor of the first embodiment described above only in the configuration of the third air supply unit A3. Aside from this, the second embodiment is the same as the first embodiment. In Figure 7, the same reference numerals are used for parts and components that are identical or equivalent to those in the first embodiment. The differences between the second embodiment and the first embodiment will now be described.

[0067] The combustor 100 according to the second embodiment is provided with two third air supply units A3. One of the third air supply units A3 is located at the rear of the combustor 100 and guides air into the tube of the second tubular section 20 from the upper radially outer side toward the center of the first axis K1. That is, the air first flows into the interior of the combustor 100 from above toward below, and then moves into the tube from one end a2 of the second tubular section 20 parallel to the first axis K1.

[0068] The other third air supply unit A3 is located at the rear of the combustor 100, and air is guided into the tube of the second tubular section 20 from the radially outer lower side toward the center of the first axis K1. That is, the air first flows into the interior of the combustor 100 from below toward upward, and then moves into the tube from one end a2 of the second tubular section 20 parallel to the first axis K1.

[0069] In addition, in the fuel supply section F, located at the rear of the combustor 100, fuel is guided into the tube of the first tubular section 10 from the radially outer lower side toward the center of the first axis K1. That is, the fuel first flows into the interior of the combustor 100 from below toward upward, and then moves into the tube from one end a1 of the first tubular section 10 parallel to the first axis K1.

[0070] With the third air supply unit A3 and fuel supply unit F configured in this way, the flame can be extended, the exhaust temperature can be reduced, and exhaust heat can be suppressed. [Explanation of symbols]

[0071] 10...First tubular section, 20...Second tubular section, 30...Third tubular section, 40...Fourth tubular section, 50...Fifth tubular section, 51...Outlet, 100...Combustor, a1, a2, a3...One end, b1, b2, b3...Other end, A1...First air supply section, A2...Second air supply section, A3...Third air supply section, F...Fuel supply section, W...Water supply section

Claims

1. A combustor that burns fuel, A first tubular section is defined at one end and the other end, formed in a tubular shape, and configured such that the fuel supplied into the tube from the one end side flows out at the other end side. The aforementioned one end and the aforementioned other end are defined, and the second tubular portion is formed in a tubular shape, including the first tubular portion within the tube, and outside the first tubular portion, the air supplied into the tube from the one end side is used for the combustion of the fuel, and the exhaust gas generated by the combustion flows out from the other end side, A third tubular portion is provided, with one end and the other end defined, formed in a tubular shape, containing the second tubular portion within the tube, and configured such that exhaust gas flowing out from the other end of the second tubular portion moves toward the one end and flows out at the one end, A fourth tubular portion is formed in a tubular shape, positioned outside the third tubular portion, and configured such that exhaust gas flowing out from one end of the third tubular portion moves in a direction away from the third tubular portion, A fuel supply unit that supplies the fuel from one end towards the inside of the first tubular section, A first air supply unit supplies the air used for the combustion of the fuel from one end to the inside of the second tubular section, A water supply unit that supplies water into the pipe of the fourth tubular section, A combustion device equipped with a combustion chamber.

2. In the combustor according to claim 1, The water supply unit is The water outlet is defined and formed in a tubular shape, and the water supplied into the pipe is configured to flow out at the outlet, and a fifth tubular section is located inside the pipe of the fourth tubular section. A combustion device equipped with a combustion chamber.

3. In the combustor according to claim 2, The fifth tubular portion is, The outlet is positioned within the fourth tubular portion so as to face away from the third tubular portion. Combustion device.

4. In the combustor according to claim 3, The fifth tubular portion is, The material includes parts made of copper. Combustion device.

5. In the combustor according to any one of claims 1 to 4, A second air supply unit supplies air, separate from the air used for the combustion of the fuel, to the inside of the fourth tubular section, which is used to promote the movement of the exhaust gas. A combustion device equipped with a combustion chamber.

6. In the combustor according to claim 5, A third air supply unit supplies air, separate from the air used for the combustion of the fuel, to the inside of the second tubular section, which is used to suppress the movement of the exhaust gas. A combustion device equipped with a combustion chamber.

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