Self-suction type inner chamber combustion tube

Abstract

The invention provides a self-suction type inner chamber combustion pipe which comprises a smoke hood assembly, an air supply assembly, a flow guide assembly and a vortex acceleration assembly, and the air supply assembly comprises an air inlet pipe and an acceleration pipe. In this way, normal-temperature fresh air passes through the accelerating pipe to accelerate the flow speed, a negative pressure area is generated near an outlet of the accelerating pipe, high-temperature smoke in the rotary kiln flows into the negative pressure area through the smoke inlet, a self-suction type structure is formed, and due to the combined action of the high-temperature smoke, the temperature between fine powder and liquid phase in high-temperature materials and the outer wall of the smoke hood assembly is basically the same. Normal oxygen is contained in the normal-temperature fresh air and burns inside after being in contact with the high-temperature flue gas, heat released by combustion heats the normal-temperature air into the high-temperature flue gas, and the high-temperature flue gas is sprayed out of the nozzle in the form of the high-temperature flue gas, so that the temperature of the nozzle is not influenced by the normal-temperature air, and the normal-temperature fresh air is prevented from being condensed on the outer wall of the smoke hood assembly. Meanwhile, heat is conveyed into the kiln, the overall temperature of the combustion tube is more uniform and closer to the environment temperature in the kiln, and ring formation in the kiln is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary kilns, and in particular to a self - sucking inner chamber combustion tube. Background Art

[0002] A rotary kiln is an important industrial equipment in industrial furnaces. However, when the rotary kiln is working, there is only one heat source in the entire furnace chamber, making it difficult to control the temperature of the long and slender furnace chamber. Over - burning and under - burning phenomena accompany the production process of the rotary kiln, affecting product quality. At the same time, it also causes the formation of rings in the rotary kiln, becoming the biggest technical obstacle in the production process of the rotary kiln. Therefore, air supply ports are usually added to the rotary kiln to solve the problem of a single heat source in the rotary kiln. By installing new air injection points, the combustible components in the high - temperature flue gas of the rotary kiln burn after obtaining oxygen in the fresh air, so as to increase the heat source for temperature control.

[0003] However, since the air blown in from the middle air supply port is normal - temperature air, such a structure in the prior art will cause the air to cool the pipe wall of the middle air supply port when passing through it, resulting in a decrease in the pipe wall temperature. This causes the liquid phase in the high - temperature materials in the kiln to condense and accumulate on the pipe wall of the middle air supply port, leading to the formation of rings in the rotary kiln and affecting normal production.

[0004] In view of this, it is necessary to propose a self - sucking inner chamber combustion tube to solve or at least alleviate the above - mentioned defects. Summary of the Invention

[0005] The main object of the present invention is to provide a self - sucking inner chamber combustion tube to solve the problem that the liquid phase of high - temperature materials in the rotary kiln is likely to condense and accumulate on the pipe wall of the middle air supply port in the prior art.

[0006] To achieve the above object, the present invention provides a self - sucking inner chamber combustion tube, which includes a smoke hood assembly, an air supply assembly, a flow - guiding assembly, and a vortex acceleration assembly; wherein,

[0007] The air supply assembly includes an air inlet pipe and an acceleration pipe for accelerating the flow rate of fresh air. The air inlet end of the acceleration pipe is connected to the air outlet end of the air inlet pipe and is communicated therewith. The smoke hood assembly is sleeved and connected to the air inlet pipe, and the acceleration pipe is disposed inside the smoke hood assembly; wherein,

[0008] A flame nozzle is provided on the smoke hood assembly, and a combustion chamber is provided inside the smoke hood assembly near the flame nozzle. A flue gas channel is formed between the outer wall and the inner wall of the smoke hood assembly. An inlet for smoke is opened on the outer wall of the smoke hood assembly near the flame nozzle. The inner wall of the smoke hood assembly has an open end and is spaced from the air inlet end of the acceleration pipe to form an outlet for smoke;

[0009] The flow guiding assembly is arranged at the smoke outlet. The flow guiding assembly has a vortex flow channel for guiding the flow. The outer side of the flow guiding assembly is connected to the inner wall of the smoke hood assembly, and the inner side of the flow guiding assembly is connected to the acceleration tube.

[0010] The vortex acceleration assembly is arranged at the air outlet end of the flow guiding assembly. The outer side of the vortex acceleration assembly is connected to the inner wall of the smoke hood assembly, and the vortex acceleration assembly has an air outlet.

[0011] Preferably, the smoke hood assembly includes a smoke hood and an inner chamber tube. The smoke hood is covered and connected to the air inlet pipe. The smoke inlet is opened on the smoke hood. The first end of the inner chamber tube is connected to one end of the smoke hood and has the flame nozzle. A gap is provided between the second end of the inner chamber tube and the air inlet end of the acceleration tube to form the smoke outlet. The smoke hood, the inner chamber tube, and the air inlet pipe enclose to form the smoke channel.

[0012] Preferably, the flow guiding assembly includes a plurality of flow guiding vanes arranged at intervals along the circumferential direction of the inner chamber tube. The outer side of the flow guiding vane is connected to the inner chamber tube, and the inner side of the flow guiding vane is connected to the acceleration tube.

[0013] Preferably, the diameter of the acceleration tube is gradually reduced from its air inlet end to its air outlet end.

[0014] Preferably, the flow guiding vane is arc-shaped, and the flow guiding vane is inclined from the outer side to the inner side towards the air outlet end of the acceleration tube.

[0015] Preferably, the vortex acceleration assembly adopts a vortex hood. The outer side of the vortex hood is connected to the inner chamber tube and is arranged at the air outlet end of the flow guiding vane.

[0016] Preferably, the number of the smoke inlets is multiple, and the multiple smoke inlets are arranged at intervals along the circumferential direction of the smoke hood.

[0017] Preferably, the vortex hood is trumpet-shaped, and the air outlet end of the vortex hood is the small-diameter end.

[0018] Preferably, the first end of the inner chamber tube and one end of the smoke hood are hermetically connected by welding.

[0019] Preferably, the number of the flow guiding vanes is twelve, and the twelve flow guiding vanes are arranged at intervals along the circumferential direction of the inner chamber tube.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] A self-priming inner chamber combustion tube provided by the present invention includes a smoke hood assembly, an air supply assembly, a flow guiding assembly, and a vortex acceleration assembly. The air supply assembly includes an air inlet pipe and an acceleration pipe for accelerating the flow rate of fresh air. The air inlet end of the acceleration pipe is connected to the air outlet end of the air inlet pipe and is communicated therewith. The smoke hood assembly is covered and connected to the air inlet pipe, and the acceleration pipe is disposed inside the smoke hood assembly. A flame nozzle is provided on the smoke hood assembly, and a combustion chamber is provided inside the smoke hood assembly near the flame nozzle. A flue gas passage is formed between the outer wall and the inner wall of the smoke hood assembly. An air inlet is opened on the outer wall of the smoke hood assembly near the flame nozzle. The inner wall of the smoke hood assembly has an open end and is spaced from the air inlet end of the acceleration pipe to form an air outlet. The flow guiding assembly is disposed at the air outlet. The flow guiding assembly has a vortex flow passage for guiding. The outer side of the flow guiding assembly is connected to the inner wall of the smoke hood assembly, and the inner side of the flow guiding assembly is connected to the acceleration pipe. The vortex acceleration assembly is disposed at the air outlet end of the flow guiding assembly. The outer side of the vortex acceleration assembly is connected to the inner wall of the smoke hood assembly, and the vortex acceleration assembly has an air outlet. In this way, the normal temperature fresh air is accelerated in the acceleration pipe, and a negative pressure area is generated near the outlet of the acceleration pipe, so that the high-temperature flue gas in the rotary kiln flows into the negative pressure area through the air inlet, forming a self-priming structure, improving the working efficiency. Due to the combined action of the high-temperature flue gas, the temperature between the fine powder and the liquid phase in the high-temperature material and the outer wall of the smoke hood assembly is basically the same, and condensation will not occur on the outer wall of the smoke hood assembly. Since the normal temperature fresh air contains normal oxygen, it burns inside after contacting the high-temperature flue gas. The heat released by the combustion heats the normal temperature air into high-temperature flue gas, which is ejected from the nozzle in the form of high-temperature flue gas. That is, it ensures that the temperature of the nozzle is not affected by the normal temperature air, while delivering heat into the kiln, making the overall temperature of the combustion tube more uniform and closer to the ambient temperature in the kiln, avoiding local low-temperature phenomena in the kiln and reducing the formation of rings in the kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0023] Figure 1 It is a schematic cross-sectional view of the overall structure in an embodiment of the present invention;

[0024] Figure 2 It is a schematic elevation view of the overall structure in an embodiment of the present invention;

[0025] Figure 3 It is a schematic cross-sectional view of the overall structure in an embodiment of the present invention;

[0026] Figure 4Schematic diagram of the working state of the overall structure in an embodiment of the present invention.

[0027] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings.

[0028] Explanation of the reference numerals in the drawings:

[0029] 10. Smoke hood assembly; 110. Flue gas hood; 111. Flue gas passage; 112. Smoke inlet; 120. Inner chamber pipe; 121. Flame nozzle; 122. Combustion chamber; 123. Smoke outlet; 20. Air supply assembly; 210. Air inlet pipe; 220. Acceleration pipe; 30. Flow guiding assembly; 310. Flow guiding vane; 40. Eddy current acceleration assembly; 410. Eddy current hood. Specific embodiments

[0030] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0034] Please refer to the attached Figures 1-4 As shown in the figure, a self-priming inner chamber combustion tube in an embodiment provided by the present invention includes a smoke hood assembly 10, an air supply assembly 20, a flow guiding assembly 30 and an eddy current acceleration assembly 40. The specific solutions are as follows:

[0035] The air supply assembly 20 includes an air inlet pipe 210 and an acceleration pipe 220 for accelerating the flow rate of fresh air. The air inlet end of the acceleration pipe 220 is connected to the air outlet end of the air inlet pipe 210 and is communicated therewith. The hood assembly 10 is sleeved and connected to the air inlet pipe 210, and the acceleration pipe 220 is disposed inside the hood assembly 10. Wherein, a flame nozzle 121 is provided on the hood assembly 10, and a combustion chamber 122 is provided inside the hood assembly 10 near the flame nozzle 121. A flue gas passage 111 is formed between the outer wall and the inner wall of the hood assembly 10. An inlet flue opening 112 is formed in the outer wall of the hood assembly 10 near the flame nozzle 121. The inner wall of the hood assembly 10 has an open end and is spaced from the air inlet end of the acceleration pipe 220 to form an outlet flue opening 123. The flow guiding assembly 30 is disposed at the outlet flue opening 123. The flow guiding assembly 30 has a vortex flow passage for flow guiding. The outer side of the flow guiding assembly 30 is connected to the inner wall of the hood assembly 10, and the inner side of the flow guiding assembly 30 is connected to the acceleration pipe 220. The vortex acceleration assembly 40 is disposed at the air outlet end of the flow guiding assembly 30. The outer side of the vortex acceleration assembly 40 is connected to the inner wall of the hood assembly 10, and the vortex acceleration assembly 40 has an air outlet.

[0036] Specifically, the self-priming inner chamber combustion tube in the present application includes a hood assembly 10, an air supply assembly 20, a flow guiding assembly 30, and a vortex acceleration assembly 40. The air supply assembly 20 is used to supply fresh air to the rotary kiln, so that the combustible components in the high-temperature flue gas of the rotary kiln burn after obtaining oxygen in the fresh air, increasing the heat source for temperature control. However, considering that the conventional access of normal-temperature fresh air will cool the pipe wall of the middle air outlet, causing the pipe wall temperature to drop, resulting in the condensation and accumulation of the liquid phase in the high-temperature materials in the kiln on the pipe wall of the middle air outlet. Therefore, the hood assembly 10 is added to access the high-temperature flue gas of the rotary kiln, so as to converge the high-temperature flue gas at the access point of the normal-temperature fresh air, and the overall temperature uniformity is improved after combustion when they meet.

[0037] Among them, the air supply assembly 20 includes an air inlet pipe 210 and an acceleration pipe 220. The air inlet pipe 210 is used to access normal-temperature fresh air to increase the heat source for the rotary kiln, and the acceleration pipe 220 is used to accelerate the flow rate of the fresh air. By increasing the air jet flow rate, a negative pressure area is formed nearby. The hood assembly 10 covers the air inlet pipe 210 and the connection part is sealed. Since a flue gas channel 111 is formed between the outer wall and the inner wall of the hood assembly 10, the high-temperature flue gas in the rotary kiln enters from the flue gas inlet 112 on the outer wall of the hood assembly 10. According to the principle of flowing from high pressure to low pressure, the high-temperature flue gas flows into the flue gas channel 111 after entering from the flue gas inlet 112, and then flows out through the flue gas outlet 123 formed by the interval between the inner wall of the hood assembly 10 and the air inlet end of the acceleration pipe 220. Thus, the high-temperature flue gas is located inside the inner wall of the hood assembly 10 and comes into contact with the normal-temperature fresh air flowing out of the acceleration pipe 220. Then, it is combusted in the combustion chamber 122 to form an incoming flame, which is sprayed out from the flame nozzle 121 into the rotary kiln hearth. In this way, in the case of accelerating the flow rate to form a negative pressure area, a self-priming structure is formed, improving the efficiency and automation performance.

[0038] Furthermore, the diversion assembly 30 is used to divert and guide the high-temperature flue gas coming out of the flue gas outlet 123. Therefore, the outer side of the diversion assembly 30 is connected to the inner wall of the hood assembly 10, so that the high-temperature flue gas starts to be diverted from the outer side of the diversion assembly 30. The inner side of the diversion assembly 30 is connected to the acceleration pipe 220 and then diverted to the vicinity of the wall of the acceleration pipe 220. The outer side of the eddy current acceleration assembly 40 is connected to the inner wall of the hood assembly 10 and is arranged at the air outlet end of the diversion assembly 30. In this way, the high-temperature flue gas is diverted along the eddy current flow path to the vicinity of the wall of the acceleration pipe 220 and is distributed inside the eddy current acceleration assembly 40, and can be shunted and accelerated through the eddy current acceleration assembly 40 to optimize the combustion efficiency.

[0039] As a preferred embodiment of the present invention, the hood assembly 10 includes a flue gas hood 110 and an inner chamber pipe 120. The flue gas hood 110 covers and is connected to the air inlet pipe 210. The flue gas inlet 112 is opened on the flue gas hood 110. The first end of the inner chamber pipe 120 is connected to one end of the flue gas hood 110 and has the flame nozzle 121. The second end of the inner chamber pipe 120 is spaced from the air inlet end of the acceleration pipe 220 to form the flue gas outlet 123. The flue gas hood 110, the inner chamber pipe 120, and the air inlet pipe 210 surround each other to form the flue gas channel 111.

[0040] It should be noted that the combination of the flue gas hood 110 and the inner chamber pipe 120 is adopted to facilitate the formation of a gap therebetween to form a flue gas channel 111. The flue gas hood 110 is covered and connected to the air inlet pipe 210 to form a sealed flue gas channel 111, avoiding the leakage of high-temperature flue gas. In this way, the high-temperature flue gas can only enter through the smoke inlet 112 on the flue gas hood 110 and flow out through the smoke outlet 123 formed by the gap between the inner chamber pipe 120 and the air inlet end of the acceleration pipe 220.

[0041] As a preferred embodiment of the present invention, the flow guiding assembly 30 includes a plurality of flow guiding vanes 310 arranged at intervals along the circumferential direction of the inner chamber pipe 120. The outer side of the flow guiding vane 310 is connected to the inner chamber pipe 120, and the inner side of the flow guiding vane 310 is connected to the acceleration pipe 220.

[0042] It should be noted that the form of arranging a plurality of flow guiding vanes 310 in a circumferential arrangement can form multi-channel flow guiding, making the air flow more evenly distributed in the pipeline or equipment, effectively reducing the turbulence and vortices of the air flow, improving the stability and conveying efficiency of the air flow. Connecting the outer side of the flow guiding vane 310 to the inner chamber pipe 120 and the inner side to the acceleration pipe 220 to cover the entire range at the smoke outlet 123, improving the flow guiding effect and comprehensiveness; preferably, the number of the flow guiding vanes 310 is twelve, and the twelve flow guiding vanes 310 are arranged at intervals along the circumferential direction of the inner chamber pipe 120. Those skilled in the art can also set the specific number according to the actual situation.

[0043] As a preferred embodiment of the present invention, the diameter of the acceleration pipe 220 gradually decreases along the direction from its air inlet end to its air outlet end.

[0044] It is worth noting that the acceleration pipe 220 adopts a structural design form with a smaller diameter at the air outlet end than at the air inlet end to increase the flow velocity at the air outlet end. The principle can refer to the continuity equation of fluid mechanics, that is, when the flow rate is constant, the smaller the cross-sectional area, the faster the flow velocity.

[0045] As a preferred embodiment of the present invention, the flow guiding vane 310 is arc-shaped, and the flow guiding vane 310 is inclined from the outer side to the inner side towards the air outlet end of the acceleration pipe 220.

[0046] It should be noted that in this way, a single flow guiding vane 310 is formed in a form that bends towards the air outlet end of the acceleration pipe 220, which can effectively change the direction of the air flow. The principle is that through its curved surface shape, an upward force is applied to the air flow, so that the air flow flows along the arc surface of the flow guiding vane 310, thereby changing the direction of the air flow to guide the high-temperature flue gas to the eddy current acceleration assembly 40.

[0047] Further, the eddy current acceleration component 40 adopts an eddy current cover 410. The outer side of the eddy current cover 410 is connected to the inner chamber pipe 120 and is arranged at the air outlet end of the guide vane 310.

[0048] It should be noted that the eddy current cover 410 can optimize the combustion process by controlling the air flow distribution and speed. The high-temperature flue gas after being shunted and accelerated by the eddy current cover 410 then contacts the normal-temperature fresh air in the inner chamber pipe 120 for combustion, improving the combustion efficiency.

[0049] Further, the number of the smoke inlets 112 is multiple, and the multiple smoke inlets 112 are arranged at intervals along the circumferential direction of the smoke hood 110.

[0050] It should be understood that by increasing the number of the smoke inlets 112, the flow rate of the high-temperature flue gas is increased. In the way of circumferential arrangement, it is convenient for the high-temperature flue gas to flow in from all directions. In a preferred embodiment of the present application, the number of the smoke inlets 112 is six, and the six smoke inlets 112 are arranged at equal intervals along the circumferential direction of the smoke hood 110.

[0051] Further, the eddy current cover 410 is in a horn shape, and the air outlet end of the eddy current cover 410 is a small-diameter end.

[0052] It should be noted that the horn shape also forms a structural shape with a changing pipe diameter cross-section. In the present application, the air outlet end of the eddy current cover 410 is a small-diameter end. In this way, the flow rate at the air outlet end of the eddy current cover 410 is fast, and the flow rate of the high-temperature flue gas can be increased after flowing out of the eddy current cover 410, so as to be close to the flow rate of the accelerated normal-temperature fresh air, ensuring sufficient combustion and the combustion effect.

[0053] Further, the first end of the inner chamber pipe 120 is hermetically connected to one end of the smoke hood 110 by welding.

[0054] It should be noted that to avoid the exposure of the high-temperature flue gas, it is necessary to ensure the sealing between the first end of the inner chamber pipe 120 and one end of the smoke hood 110. The welding connection method is convenient and has good sealing performance. Similarly, other connections in the present application, such as between the smoke hood 110 and the air inlet pipe 210, between the outer side of the guide vane 310 and the inner chamber pipe 120, between the inner side of the guide vane 310 and the acceleration pipe 220, and between the outer side of the eddy current cover 410 and the inner chamber pipe 120, can all adopt the welding connection method.

[0055] For the convenience of those skilled in the art to understand, the working state of the present application is briefly described as follows:

[0056] In the working state, normal-temperature fresh air is introduced from the air inlet pipe 210, and after being accelerated by the acceleration pipe 220, it forms a high-speed air jet and sprays out from the air outlet end of the acceleration pipe 220. Under the action of the air jet, a negative pressure area will appear near the high-speed air jet outlet (air outlet end) of the acceleration pipe 220 inside the inner chamber pipe 120. Under the action of the negative pressure, the high-temperature flue gas in the rotary kiln furnace chamber enters the inner cavity (flue gas passage 111) of the flue gas hood 110 through the smoke inlet 112, passes through the smoke outlet 123 formed by the inner chamber pipe 120 and the guide vane 310, and then enters the eddy current hood 410 through the eddy current flow channel. The eddy current hood 410 mixes and accelerates the high-temperature flue gas and then introduces it into the inner chamber pipe 120. The high-temperature flue gas and the normal-temperature fresh air meet and burn in the inner chamber pipe 120, complete the combustion process after passing through the combustion chamber 122, form an inlet furnace flame, and enter the furnace chamber from the flame nozzle 121.

[0057] Thus, due to the action of the high-temperature flue gas, the temperature of the flue gas hood 110 is basically the same as that of the material. The fine powder and liquid phase in the high-temperature material will not condense on the outer wall of the flue gas hood 110. The high-temperature flue gas and the normal-temperature fresh air burn inside the inner chamber pipe 120, which improves the concentration of the flame. At the same time, it also makes the overall temperature of the combustion pipe more uniform and closer to the ambient temperature in the kiln, avoiding the phenomenon of local low temperature in the kiln and reducing the formation of rings in the kiln.

[0058] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A self-priming inner chamber combustion tube, characterized in that, It includes a smoke hood assembly, an air supply assembly, a flow guiding assembly, and a vortex acceleration assembly; among them, the air supply assembly includes an air inlet pipe and an acceleration pipe for accelerating the flow rate of fresh air. The air inlet end of the acceleration pipe is connected to the air outlet end of the air inlet pipe and is communicatively arranged therewith. The smoke hood assembly is covered and connected to the air inlet pipe, and the acceleration pipe is disposed inside the smoke hood assembly; among them, a flame nozzle is provided on the smoke hood assembly, and a combustion chamber is provided inside the smoke hood assembly near the flame nozzle. A flue gas passage is formed between the outer wall and the inner wall of the smoke hood assembly. An inlet for the flue gas is opened on the outer wall of the smoke hood assembly near the flame nozzle. The inner wall of the smoke hood assembly has an open end and is spaced from the air inlet end of the acceleration pipe to form an outlet for the flue gas; the flow guiding assembly is disposed at the outlet for the flue gas. The flow guiding assembly has a vortex flow passage for guiding. The outer side of the flow guiding assembly is connected to the inner wall of the smoke hood assembly, and the inner side of the flow guiding assembly is connected to the acceleration pipe; the vortex acceleration assembly is disposed at the air outlet end of the flow guiding assembly. The outer side of the vortex acceleration assembly is connected to the inner wall of the smoke hood assembly, and the vortex acceleration assembly has an air outlet.

2. The self-priming inner chamber combustion tube according to claim 1, characterized in that the smoke hood assembly includes a flue gas hood and an inner chamber pipe. The flue gas hood is covered and connected to the air inlet pipe. The inlet for the flue gas is opened on the flue gas hood. The first end of the inner chamber pipe is connected to one end of the flue gas hood and has the flame nozzle. The second end of the inner chamber pipe is spaced from the air inlet end of the acceleration pipe to form the outlet for the flue gas. The flue gas hood, the inner chamber pipe, and the air inlet pipe surround to form the flue gas passage.

3. The self-priming inner chamber combustion tube according to claim 2, characterized in that, the flow guiding assembly includes a plurality of flow guiding vanes arranged at intervals along the circumferential direction of the inner chamber pipe. The outer side of the flow guiding vane is connected to the inner chamber pipe, and the inner side of the flow guiding vane is connected to the acceleration pipe.

4. The self-priming inner chamber combustion tube according to claim 3, wherein the diameter of the acceleration pipe is gradually reduced in the direction from its air inlet end to its air outlet end.

5. The self-priming inner chamber combustion tube according to claim 4, wherein the flow guiding vane is arc-shaped, and the flow guiding vane is inclined toward the air outlet end of the acceleration pipe from the outer side to the inner side.

6. The self-priming inner chamber combustion tube according to claim 3, characterized in that, the vortex acceleration assembly adopts a vortex hood. The outer side of the vortex hood is connected to the inner chamber pipe and is disposed at the air outlet end of the flow guiding vane.

7. The self-priming inner chamber combustion tube according to claim 2, characterized in that, the number of the inlets for the flue gas is multiple, and the multiple inlets for the flue gas are arranged at intervals along the circumferential direction of the flue gas hood.

8. The self-priming inner chamber combustion tube according to claim 6, wherein the vortex hood is trumpet-shaped, and the air outlet end of the vortex hood is a small-diameter end.

9. The self-priming inner chamber combustion tube according to claim 2, characterized in that, the first end of the inner chamber pipe is hermetically connected to one end of the flue gas hood by welding.

10. The self-priming inner chamber combustion tube according to claim 3, characterized in that, the number of the flow guiding vanes is twelve, and the twelve flow guiding vanes are arranged at intervals along the circumferential direction of the inner chamber pipe.

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