WO2018218524A1

WO2018218524A1 - Self-cooling injection-type combustion device

Info

Publication number: WO2018218524A1
Application number: PCT/CN2017/086661
Authority: WO
Inventors: 胡秀文
Original assignee: 深圳智慧能源技术有限公司
Priority date: 2017-05-31
Filing date: 2017-05-31
Publication date: 2018-12-06

Abstract

Provided is a self-cooling injection-type combustion device, comprising a wall barrel (12), wherein the wall barrel (12) is open at upper and lower ends, and a combustion chamber (14) is formed in the wall barrel (12). A plurality of combustors (16) are arranged along the periphery of the bottom of the wall barrel (12). The combustor (16) comprises a mixing pipe (20) and a nozzle (22). The mixing pipe (20) is provided with a gas inlet end (26) and a gas outlet end (28). The nozzle (22) is arranged on the gas inlet end (26), and is used for spraying fuel into the mixing pipe (20) and sucking external air into the mixing pipe (20) by utilizing an injection effect. The combustion device further comprises an air flowing passage (36) which guides the sucked-in air to flow, and the air flowing passage (36) extends from the periphery of the wall barrel (12) to the gas inlet end (26) of the mixing pipe (20), so that the sucked-in air can cool the wall barrel (12) before reaching the gas inlet end (26) of the mixing pipe (20).

Description

Self-cooling ejector combustion device

Technical field

[0001] The present invention relates to an ejector combustion apparatus, and more particularly to a self-cooling ejector combustion apparatus.

Background technique

[0002] At present, the exhaust gas generated during the oil and gas recovery process is more difficult to recycle, and is now discharged to the high-altitude flare or ground torch for burning. The existing ejector burner is a burner that provides air without additional power. The air required for the combustion of the ejector burner is derived from the air of the gas kinetic energy, and the injected air is directly mixed with the fuel gas. . The protective cover of the ejector-type combustion device, especially the uppermost protective cover, works in a high temperature environment for a long time, which causes the protective cover material to be resistant to high temperatures, and even the high-temperature resistant material has a limited service life, and most of them have environmental problems, and High cost. Moreover, the protective cover has no measures of lowering the temperature and lowering the radiation, and the working device of the burning device has a large radiation to the environment.

technical problem

In view of this, the present invention proposes a self-cooling ejector combustion apparatus.

Problem solution

Technical solution

[0004] The present invention provides a self-cooling ejector type combustion apparatus, comprising a wall cylinder, the wall cylinder is a top and bottom mouth and a combustion chamber is formed therein, and a plurality of burners are arranged along the circumference of the bottom of the wall tube. The burner includes a mixing tube and a nozzle, the mixing tube has an inlet end and an outlet end, and the nozzle is disposed at the inlet end to inject fuel into the mixing tube and use an external force to externally Air is drawn into the mixing tube, the combustion device further comprising an air flow path for guiding the flow of the sucked air, the air flow path extending from a periphery of the wall barrel to an intake end of the mixing tube, The inhaled air is allowed to cool before reaching the intake end of the mixing tube.

[0005] In an embodiment, the ejector-type combustion apparatus includes a plurality of protective hoods arranged in a vertical direction, each of the shields being closed in a circumferential direction to form a flame chamber having upper and lower jaw ends, in the vertical In the two adjacent shields in the straight direction, the radial width of the upper shield is greater than the radial width of the next layer, so that a fluid communication with the flame chamber is formed between the adjacent two shields. Ejection zone, the multi-layer shield package And including an uppermost protective cover, the uppermost protective cover including the wall cylinder, the plurality of burners being disposed in the ejector area, and each of the burners being radially inwardly deflected with respect to a vertical direction.

[0006] In an embodiment, the outer portion of the wall cylinder is provided with a cooling structure, the cooling structure includes a cooling jacket, and the cooling jacket is spaced apart from the outer wall of the wall cylinder to form a cooling flow passage. The cooling jacket is provided with an air inlet communicating with the cooling flow passage, and the cooling flow passage is a part of the air flow passage.

[0007] In an embodiment, an upper edge of the cooling jacket is sealingly connected to an upper edge of the wall cylinder, and the cooling jacket is provided with a plurality of layers arranged circumferentially spaced through the cooling clamp A window of the sleeve, the plurality of windows collectively forming the air inlet.

[0008] In an embodiment, each layer of the window is uniformly disposed along a circumferential direction of the cooling jacket, and each of the windows corresponds to a position in a vertical direction, and between the two adjacent windows in a circumferential direction. There is a partition.

[0009] In an embodiment, the multi-layer window includes an upper window disposed adjacent to an upper edge of the cooling jacket and at least a lower window located below the upper window, the upper window having a cross-sectional area greater than the At least the cross-sectional area of the lower window.

[0010] In an embodiment, the cooling structure includes a plurality of heat dissipation ribs disposed between the cooling jacket and the outer wall of the wall tube, and each of the heat dissipation ribs is disposed corresponding to a window. Each of the heat dissipation ribs is disposed in a vertical direction, and the heat dissipation ribs are perpendicular to the outer wall of the wall tube and the inner wall of the cooling jacket, and each of the heat dissipation ribs is located at the corresponding window in the circumference In the upward middle position, each of the heat dissipation ribs is provided with a plurality of heat dissipation holes.

[0011] In an embodiment, the burner further includes a support portion and a burner base, the nozzle is fixedly mounted on the burner base, and an upper end of the support portion is connected to a lower edge of the mixing tube, The lower end of the support portion is connected to the burner base, and the uppermost shield is externally provided with an annular tube for supplying fuel to the burner, and the annular tube is provided with a plurality of connecting branches, the connecting branch tube The end of the seal is in sealing connection with the burner base such that the connecting branch communicates with the inlet of the nozzle.

[0012] In an embodiment, the uppermost protective cover includes the wall tube and a cooling jacket, and a sealing connection is connected between a lower end of the uppermost protective cover and the supporting portion, and the sealing connection is One end of the portion is in communication with the cooling flow passage, and the other end is sealingly connected to the support portion such that air in the cooling flow passage flows toward an intake end of the mixing tube.

[0013] In an embodiment, the sealing connection portion extends downward from the lower edge of the wall cylinder and the cooling jacket a cylindrical connecting portion and a receiving portion connected to the lower end of the connecting portion, the receiving portion is sleeved around the supporting portion and sealingly connected with the supporting portion, and the cavity in the connecting portion forms a connecting flow channel. The cavity in the containing portion forms an absorption chamber, one end of the connecting flow channel is in communication with the cooling flow channel, and the other end is in communication with the absorption chamber, and the absorption chamber is in communication with the interior of the mixing tube, the air flow The passage includes a cooling flow passage, a connecting flow passage, and an absorption chamber.

Advantageous effects of the invention

Beneficial effect

In summary, the present invention provides a self-cooling ejector type combustion apparatus in which an air ejector opening is provided at an outer peripheral portion of a hood wall cylinder. By adding a cooling jacket to the entire shield to form an air flow passage closed at one end, the outside of the wall cylinder is provided with a cooling structure, the cooling structure includes a cooling jacket, and a cooling flow passage is formed between the cooling jacket and the outer wall of the wall cylinder, and the cooling clamp is formed. The air inlet is connected to the cooling flow passage. Working 吋 Fuel The nozzle sprays high-speed fuel gas, which causes a certain degree of vacuum to the air flow path. Air is sucked from the outside of the hood and enters the mixing tube of the burner along the cooling flow path and is mixed with the fuel gas to be ejected and burned. The inside of the shield is a high temperature flame, and the outside of the shield is room temperature air. The air flows through the heat dissipation ribs on the outer wall and the outer wall of the wall cylinder to remove a large amount of heat from the convection heat to cool the shield.

[0015] Since the present invention introduces air for combustion support into the shield for use as a post-cooling combustion, the advantages of the ejector burner are retained, and the cooling of the shield is increased, which not only improves the stability of combustion but also prolongs the stability of the combustion. The service life of the shield reduces the radiation from the enclosure to the environment.

Brief description of the drawing

DRAWINGS

1 is an overall cross-sectional view of a self-cooling ejector combustion apparatus of the present invention.

2 is an enlarged schematic view showing the structure of the portion A of FIG. 1.

Embodiments of the invention

[0018] Before the embodiments are described in detail, it is understood that the invention is not limited to The invention may be embodied in other ways. Further, it should be understood that the phraseology and terminology used herein are for the purpose of description Ben The words "including", "comprising", "having", and the like, are used in the context of the meaning of In particular, when describing "a certain component", the present invention does not limit the number of the components to one, and may include a plurality.

[0019] The present invention provides a self-cooling ejector combustion apparatus comprising a multi-layered shield arranged in a vertical direction and a multi-layer venturi burner, each of which is closed in the circumferential direction In order to form a flame chamber having two upper and lower mouth ends, in the two layers of the protective cover adjacent in the vertical direction, the radial width of the upper protective cover is greater than the radial width of the next layer, so that the adjacent two layers are protected. An ejector region is formed between the hoods in fluid communication with the flame chamber. The multi-layer venturi burner includes at least one upper venturi burner and a bottom venturi burner disposed in the lowermost shield, the at least one upper venturi burner being disposed on the outer circumferential surface of the shield and along the circumference thereof An interval distribution, an upper portion of each upper venturi burner extending into the ejector region such that a flame formed by the venturi burner is at least horizontally obscured by an upper hood that is next to the venturi The inner burner is placed in the lowermost shield.

[0020] The ejector type combustion device includes an uppermost protective cover. In this embodiment, the venturi burner is disposed in an ejection area between the uppermost protective cover and the next protective cover, and each The venturi burner is arranged to deflect radially inward relative to the vertical. Since the burner is deflected radially inwardly, the resulting flame will be radially inward away from the wall of the shield so that the thermal stress of the shield can be reduced.

[0021] In the embodiment shown in FIGS. 1 and 2, the self-cooling ejector burner includes a plurality of layers of shields arranged in a vertical direction, only the uppermost shield is shown. The multi-layered shield includes an uppermost protective cover 10, and the uppermost protective cover 10 includes a walled cylinder 12 having a top and bottom end ports and a combustion chamber 14 formed therein. The pilot zone at the bottom of the wall cylinder 12 is provided with a plurality of burners 16 arranged circumferentially. In the illustrated embodiment, the plurality of burners 16 are each arranged to deflect radially inwardly with respect to the vertical direction, The flame that burns the burner 16 is moved away from the inner wall of the wall cylinder 12 of the uppermost shield 10, reducing the thermal stress of the uppermost shield 10. The angle at which the burner 16 is deflected can be 3-15 degrees.

[0022] The combustor 16 includes a combustion head 18, a mixing tube 20, a nozzle 22, and a burner base 24. The mixing tube 20 has an inlet end 26 and an outlet end 28, and the combustion head 18 is disposed at the outlet end 28 of the mixing tube 20 for combusting a mixture of fuel gas and air; the nozzle 22 is disposed at the inlet end 26 of the mixing tube 20, The fuel gas is injected into the mixing tube 20 and the outside air is sucked into the mixing tube 20 by the ejector action. The nozzle 22 is fixedly mounted on the burner base 24, and the combustion head 18 is connected to the mixing tube 20 by welding or integrally formed. [0023] In the illustrated embodiment, the burner 16 further includes a support portion 30 having a thin plate structure, the upper end of the support portion 30 is connected to the lower edge of the mixing tube 20, and the lower end of the support portion 30 is connected to the burner. Base 24. The support portion 30 not only functions to fix the mixing tube 20 and the burner base 24, but also operates in the burner 16, and its thin plate structure design can reduce the vibration of the burner 16 to some extent.

[0024] The outer portion of the uppermost protective cover 10 is provided with an annular pipe 32 for supplying fuel gas to the burner 16, and the annular pipe 32 is provided with a plurality of connecting branch pipes 34. Specifically, the number of the connecting branch pipes 34 is the same as the number of the burners 16, and the end of each connecting branch pipe 34 is sealingly connected with the burner base 24 of the corresponding burner 16, so that the connecting branch pipe 34 communicates with the air inlet of the nozzle 22. The fuel gas is delivered into the nozzle 22. The same annular tube 32 also has the function of supporting the fixed burner 16.

[0025] The bow I-injection device further includes an air flow path 36 through which air drawn by the air is drawn, and the air flow path 36 extends from the periphery of the wall tube 12 to the intake end 26 of the mixing tube 20, such that The inhaled air cools the uppermost shield 10 before reaching the intake end 26 of the mixing tube 20, and then the air enters the mixing tube 20 to be mixed with the fuel gas and burned.

Specifically, the outer portion of the wall cylinder 12 is provided with a cooling structure, and the cooling structure includes a cooling jacket 38. The cooling jacket 38 is spaced apart from the outer wall of the wall cylinder 12 to form a cooling flow passage 40, wherein the cooling flow passage 40 is a part of the air flow path 36. In the illustrated embodiment, the cooling jacket 38 is disposed parallel to the wall barrel 12 and of the same length. An air inlet 42 communicating with the cooling flow passage 40 is provided on the cooling jacket ₃₈ . The upper edge of the cooling jacket 38 is sealingly coupled to the upper edge of the wall barrel 12, and the lower edge of the cooling jacket 38 is flush with the lower edge of the wall barrel 12.

[0027] In an embodiment, the uppermost protective cover 10 includes a wall tube 12 and a cooling jacket 38. A plurality of sealing connecting portions 44 are connected between the lower end of the uppermost protective cover 10 and the supporting portion 30, and the sealing connecting portion 44 is sealed. The number is the same as the number of burners 16. A sealed passage communicating with the cooling flow passage 40 and the mixing tube 20 is formed in the seal connecting portion 44, and the sealed passage is a portion of the air flow passage 36 such that air in the cooling flow passage 40 can flow to the mixing tube 20 through the sealed passage. Intake end 26.

[0028] One end of the seal connection portion 44 is in communication with the cooling flow passage 40, and the other end is sealingly connected to the support portion 30 such that the air in the cooling flow passage 40 flows into the mixing tube 20. Specifically, the sealing connection portion 44 includes a cylindrical connecting portion 46 extending downward from the lower edge of the wall cylinder 12 and the cooling jacket ₃₈ , and a receiving portion 48 connected to the lower end of the connecting portion 46. The receiving portion 48 is sleeved on the support. The periphery of the portion 30 is sealingly connected to the side of the support portion 30. In the illustrated embodiment, the cross-sectional area of the connecting portion 46 exhibits a tendency to taper in a vertically downward direction, The cavity in the joint 46 forms a connecting flow passage 50, and the cavity in the receiving portion 48 forms the absorption chamber 52. The two ends of the connecting flow passage 50 are respectively communicated with the cooling flow passage 40 and the absorption chamber 52, and the absorption chamber 52 communicates with the interior of the mixing tube 20, wherein the connecting flow passage 50 and the absorption chamber 52 are both part of the air flow passage 36, That is, the air flow path 36 includes the cooling flow path 40, the connecting flow path 50, and the absorption chamber 52 that communicate with each other.

[0029] The cooling jacket 38 is provided with an air inlet 42 communicating with the cooling flow passage 40. In particular, the cooling jacket 38 is provided with a plurality of windows extending through the cooling jacket 38 along the circumferential spacing of the uppermost shield 10. All of the windows 54 collectively form an air inlet 42.

[0030] The multi-layer window 54 includes an upper window 54 disposed adjacent the upper edge of the cooling jacket 38 and at least a lower window 54 located below the upper window 54. The upper window 54 has a larger cross-sectional area than the at least lower window 54. Sectional area. Since the upper temperature of the shield is higher than the lower temperature, the window 54 on the cooling jacket 38 is set to a plurality of layers, and the cross-sectional area of the upper window 54 is larger than the cross-sectional area of at least the lower window 54, in order to distribute the cooling air so that the upper layer Window 54 can draw in more air to cool the upper portion of the hotter shield.

[0031] In the illustrated embodiment, the window 54 is arranged in a rectangular shape. The window 54 is provided in three layers, and the three-layer window 54 is evenly distributed along the circumferential direction of the cooling jacket _38. Each layer of windows 54 is correspondingly positioned in the vertical direction, and a partition 56 is provided between the two adjacent windows 54 in the circumferential direction. The cross-sectional area of the uppermost window 54 is larger than the cross-sectional area of the intermediate layer window 54 and the lowermost window 54. For example, the intermediate layer window 54 is the same size as the lowermost layer window 54, and the length of the uppermost layer window 54 in the vertical direction is greater than the length of the intermediate layer window 54 and the lowermost layer window 54, for example, the length of the uppermost layer window 54 is the middle layer. The window 54 and the lowermost window 54 are twice the length, and the three-layer window 54 has the same width.

[0032] It should be understood that the design manner of the window 54 in the above embodiment is merely exemplary. In other embodiments, the window 54 may be arranged in other manners according to actual design requirements, for example, the three-layer window 54 is mutually Staggered arrangement. The size relationship of the three-layer window 54 may also be other design manners, and the present invention is not limited thereto.

[0033] It should also be understood that in other embodiments, the number of layers of the window 54 is appropriately set according to the length of the cooling jacket 38 and other design requirements, and the window 54 may be designed in other shapes, such as an inverted trapezoid, or more. a combination of shapes.

[0034] In the illustrated embodiment, the cooling structure further includes a cooling jacket 38 and an outer wall of the wall tube 12. A plurality of heat radiating ribs 58 are located at a corresponding window 54 position. The heat dissipation rib 58 is used to exchange heat between the air of the suction window 54 and the heat dissipation rib 58 to achieve cooling of the wall tube 12, and the heat dissipation rib 58 is connected between the cooling jacket 38 and the wall tube 12. Structural support can be formed to make the cooling structure more stable. Each of the heat radiating ribs 58 is disposed along the axial direction of the burning device, and the heat radiating ribs 58 are perpendicular to the outer wall of the wall tube 12 and the inner wall of the cooling jacket 38, and each of the heat radiating ribs 58 is disposed in the circumferential direction of the corresponding window 54. middle place.

In this embodiment, a plurality of heat dissipation holes 60 are provided in each of the heat dissipation ribs 58 to increase the surface area of the heat dissipation ribs 58 to promote heat dissipation.

[0036] It should be understood that the above-described arrangement of the heat dissipation ribs 58 is only a preferred embodiment of the present invention. In other embodiments, the heat dissipation ribs 58 may also be set in other installation manners according to the specific design requirements of the combustion apparatus. For example, the heat dissipation ribs 58 are designed to have an angle with the outer walls of the cooling jacket 38 and the wall barrel 12.

[0037] In operation, the nozzle 22 injects the fuel gas to cause the air flow path 36 to form a certain degree of vacuum. Due to the negative pressure, the normal temperature air outside the uppermost protective cover 10 is sucked into the cooling flow path 40 through the window 54, and the air passes through the heat dissipation rib. The plate 58 and the cooling flow path 40 carry out the heat transferred from the inner wall of the wall tube 12 by convection heat transfer to cool and lower the uppermost protective cover 10, thereby improving the working environment of the uppermost protective cover 10.

The self-cooling ejector burner of the present invention retains the advantages of an ejector burner and adds a cooling function to the shield. The heat dissipation ribs 58 are provided to enhance heat transfer, and the air participating in the combustion assists first participates in the cooling of the hood and then participates in the combustion. The enthalpy of the mixture in the mixing tube 20 is increased, which not only improves the stability of the combustion, but also prolongs the service life of the shield and reduces the radiation of the shield to the environment.

[0039] It should be noted that since the combustion device is in operation, the flame is mainly concentrated in the flame chamber of the uppermost shield, and therefore, the temperature of the uppermost shield is the highest. In the above embodiment, the cooling structure is provided only on the uppermost protective cover of the combustion device, but this is only a preferred embodiment of the present invention. In other embodiments, depending on the actual situation of the combustion device, it is also possible to A cooling structure is provided on one of the lower shields or the plurality of lower shields, which is not limited by the present invention.

In summary, the present invention provides a self-cooling ejector combustion apparatus in which an air ejector is disposed at an outer peripheral portion of a shield wall cylinder. An air flow passage closed at one end is formed by adding a cooling jacket to the entire shield, and a cooling structure is arranged outside the wall cylinder, and the cooling structure includes a cooling jacket, a cooling jacket and an outer wall of the wall cylinder A cooling flow passage is formed between the cooling jacket and an air inlet communicating with the cooling flow passage. The working 吋 fuel nozzle ejects a high-speed fuel gas to cause a certain degree of vacuum to the air flow passage, and the air is sucked from the outside of the hood into the mixing pipe of the combustor along the cooling flow path and mixed with the fuel gas to be ejected and burned. The inside of the shield is a high temperature flame, and the outside of the shield is room temperature air. The air vents flowing through the outer wall and the outer wall of the wall tube remove a large amount of heat by convection heat to cool the shield. Since the present invention introduces air for combustion support into the shield for use as a post-cooling combustion, the advantages of the ejector burner are retained and the cooling of the shield is increased, which improves the stability of the combustion and extends the hood. The service life reduces the radiation of the shield to the environment.

The concepts described herein may be embodied in other forms without departing from the spirit and scope. The specific embodiments disclosed are to be considered as illustrative and not restrictive. Therefore, the scope of the invention is to be determined by the appended claims rather Any changes which come within the meaning and range of the claims are intended to be within the scope of the claims.

Claims

Claim

A self-cooling ejector type combustion device comprises a wall cylinder, wherein the wall cylinder is a top and bottom end mouth and a combustion chamber is formed therein, the bottom of the wall tube is provided with a plurality of burners in a circumferential direction, and the burner comprises a mixture a tube and a nozzle, the mixing tube having an intake end and an outlet end, the nozzle being disposed at the intake end for injecting fuel into the mixing tube and drawing external air into the mixing by using a bowing action In the tube, the combustion device further includes an air flow passage for guiding the flow of the sucked air, the air flow passage extending from a periphery of the wall cylinder to an intake end of the mixing tube, such that The inhaled air cools the wall barrel before reaching the intake end of the mixing tube.

A self-cooling ejector type combustion apparatus according to claim 1, wherein said ejector type combustion apparatus comprises a plurality of hoods arranged in a vertical direction, each of which is closed in the circumferential direction to be formed In the flame chambers at the upper and lower sides of the mouth, in the two layers of the protective cover adjacent in the vertical direction, the radial width of the upper protective cover is larger than the radial width of the lower layer, so that between the adjacent two protective covers Forming an ejector region in fluid communication with the flame chamber, the multi-layered shield includes an uppermost shield, the uppermost shield includes the wall cylinder, and the plurality of burners are disposed in the ejector region And each of the burners is radially inwardly deflected with respect to the vertical direction.

A self-cooling ejector type combustion apparatus according to claim 2, wherein said outer portion of said wall cylinder is provided with a cooling structure, said cooling structure comprising a cooling jacket, said cooling jacket and said wall cylinder A cooling flow passage is formed between the outer walls, and the cooling jacket is provided with an air inlet communicating with the cooling flow passage, and the cooling flow passage is a part of the air flow passage. The self-cooling ejector combustion apparatus according to claim 3, wherein an upper edge of the cooling jacket is sealingly connected to an upper edge of the wall cylinder, and the cooling jacket is provided with a plurality of layers along a circumferential direction. A plurality of spaced-apart windows extending through the cooling jacket, the plurality of windows collectively forming the air inlet.

The self-cooling ejector type combustion apparatus according to claim 4, wherein each of said windows is uniformly disposed along a circumferential direction of said cooling jacket, and said each of said windows is vertically aligned in a horizontal direction, circumferentially A partition is provided between two adjacent windows. A self-cooling ejector combustion apparatus according to claim 5, wherein said multi-layer window comprises an upper window disposed adjacent to an upper edge of said cooling jacket and at least a lower window positioned below said upper window, The cross-sectional area of the upper window is greater than the cross-sectional area of the at least one lower window.

The self-cooling ejector type combustion apparatus according to claim 5, wherein the cooling structure comprises a plurality of heat dissipation ribs disposed between the cooling jacket and the outer wall of the wall cylinder, each of the heat dissipation The ribs are located in a corresponding window, each of the heat dissipation ribs is disposed in a vertical direction, and the heat dissipation ribs are perpendicular to the outer wall of the wall tube and the inner wall of the cooling jacket, and each of the heat dissipation ribs is located The corresponding window is in the middle of the circumferential direction, and each of the heat dissipation ribs is provided with a plurality of heat dissipation holes.

A self-cooling ejector type combustion apparatus according to claim 3, wherein said burner further comprises a support portion and a burner base, said nozzle being fixedly mounted on said burner base, said support portion upper end Connected to a lower edge of the mixing tube, a lower end of the support portion is connected to the burner base, and an outer annular cover is provided outside the uppermost shield to provide fuel to the burner, and the annular tube is provided There are a plurality of connecting branches, and the end of the connecting branch is sealingly connected to the burner base such that the connecting branch communicates with the inlet of the nozzle.

A self-cooling ejector type combustion apparatus according to claim 8, wherein said uppermost shield includes said wall cylinder and a cooling jacket, between a lower end of said uppermost shield and said support portion A sealing connection portion is connected, one end of the sealing connection portion is in communication with the cooling flow passage, and the other end is sealingly connected to the support portion, so that air in the cooling flow passage flows toward an intake end of the mixing tube.

A self-cooling ejector combustion apparatus according to claim 9, wherein said seal connecting portion includes a cylindrical connecting portion extending downward from said lower wall of said wall cylinder and said cooling jacket, and is connected to said a receiving portion at a lower end of the connecting portion, the receiving portion is sleeved around the supporting portion and is sealingly connected to the supporting portion, the cavity in the connecting portion forms a connecting flow channel, and the cavity in the containing portion forms an absorption chamber One end of the connecting flow channel is in communication with the cooling flow channel, and the other end is in communication with the absorption chamber, and the absorption chamber is in communication with the interior of the mixing tube. The air flow passage includes a cooling flow passage, a connecting flow passage, and an absorption chamber.