CN117146272A

CN117146272A - Radiation inner tube and radiation tube

Info

Publication number: CN117146272A
Application number: CN202311111134.6A
Authority: CN
Inventors: 谭荣雄; 伍勇争; 江文彬; 苏海斌; 黎洁韶; 赵星星; 谢利锋; 钟志飞; 郑少南; 何文辉; 刘文飞
Original assignee: Guangdong Zhongnan Iron and Steel Co Ltd
Current assignee: Guangdong Zhongnan Iron and Steel Co Ltd
Priority date: 2023-08-30
Filing date: 2023-08-30
Publication date: 2023-12-01

Abstract

The embodiment of the application provides a radiation inner pipe and a radiation pipe, wherein the radiation inner pipe comprises an inner pipe body, the inner pipe body comprises an air inlet end and an air outlet end, a small hole pipe communicated with the inside of the inner pipe body is arranged on the outer side of the inner pipe body, an included angle between the axis of the small hole pipe and the axis of the inner pipe body is 10-20 degrees, and the small hole pipe is obliquely arranged towards the air inlet end; the inner pipe body and the small hole pipe are made of heat-resistant metal materials. According to the heat-resistant metal structure with the integrated radiation inner tube, the deformation-resistant rib plates are arranged outside the radiation inner tube, so that the problems of easy breakage in the processes of equipment installation, transportation and use are avoided; the radiation inner tube comprises the small hole tube, when the radiation inner tube works normally, the small hole tube does not influence the normal circular combustion in the radiation tube, and when the radiation tube deforms, the gas outside the inner tube can enter the inner side of the inner tube through the small hole tube, so that the circular combustion is realized.

Description

Radiation inner tube and radiation tube

Technical Field

The application relates to the field of radiant tubes, in particular to a radiant inner tube and a radiant tube.

Background

The existing radiant tube and inner tube structure is generally shown in figure 1, the radiant tube and the inner tube are made of SiC, the radiant tube of the existing heat treatment furnace is easy to deform due to the change of furnace temperature after being used for a long time, the radiant tube is damaged after being deformed, the SiC is extremely easy to damage, the inner tube of the radiant tube is damaged and broken along with the deformation or damage of the radiant tube, and the like, and the SiC inner tube is difficult to install and cannot be installed due to the deformation of the radiant tube; the flame sprayed out of the burner of the heat treatment furnace can not form a circular combustion inside the radiant tube, a series of faults of the burner of the heat treatment furnace are further caused, great difficulty is caused to maintenance of the heat treatment furnace, and the maintenance cost of heat treatment equipment is increased.

Disclosure of Invention

The application aims to provide an inner radiant tube and an inner radiant tube, which replace silicon carbide with heat-resistant metal, so that the problem that the inner radiant tube is easy to crack after being extruded and the normal operation of the inner radiant tube is influenced is avoided.

Embodiments of the application may be implemented as follows:

in a first aspect, the application provides a radiation inner tube, which comprises an inner tube body, wherein the inner tube body comprises an air inlet end and an air outlet end, a small hole tube communicated with the inside of the inner tube body is arranged on the outer side of the inner tube body, an included angle between the axis of the small hole tube and the axis of the inner tube body is 10-20 degrees, and the small hole tube is obliquely arranged towards the air inlet end; the inner pipe body and the small hole pipe are made of heat-resistant metal materials.

In an alternative embodiment, the inner pipe body is provided with rib plates along the axial direction of the inner pipe body, and the rib plates are more than two and are sequentially arranged along the circumferential direction of the inner pipe body.

In an alternative embodiment, the small hole pipes are arranged in two or more rows along the circumferential direction of the inner pipe body, and each row of small hole pipes comprises two or more small hole pipes arranged along the axial direction of the inner pipe body.

In an alternative embodiment, the small bore tube is welded uniformly to the inner tube body.

In an alternative embodiment, the angle between the axis of the small bore tube and the axis of the inner tube body is 15 °.

In an alternative embodiment, the heat resistant metal is Cr25Ni35Nb heat resistant cast steel.

In a second aspect, the application provides a radiant tube, which comprises a radiant tube body made of heat-resistant metal, wherein one end of the radiant tube body is closed, the other end of the radiant tube body is provided with a burner, the burner is provided with a gas inlet, an air inlet and a flue gas outlet, any one of the radiant tube in the previous embodiment is arranged in the radiant tube body, the air inlet end of the inner tube body is close to the burner and is provided with a gap with the burner, the air outlet end of the inner tube body is close to the closed end of the radiant tube body and is provided with a gap with the closed end, a flue gas channel is arranged between the inner tube body and the radiant tube body, the air inlet end of the flue gas channel is communicated with the air outlet end of the inner tube body, and the air outlet end of the flue gas channel is communicated with the burner.

In an alternative embodiment, the end of the small hole tube away from the inner tube body abuts against the inner wall of the radiant tube body.

In an alternative embodiment, the burner comprises an inner layer pipe, an outer layer pipe and an exhaust channel arranged between the inner layer pipe and the outer layer pipe, wherein a baffle ring is arranged at one end, close to the inner pipe, of the inner layer pipe, an air inlet hole is formed in the middle of the baffle ring, and the inside of the radiant pipe is communicated with the flue gas outlet through the exhaust channel.

In an alternative embodiment, the baffle ring is gradually inclined towards the direction of the inner radiation pipe along the direction approaching to the pipe axis of the inner layer.

The beneficial effects of the embodiment of the application include, for example:

the radiation inner pipe is of an integrated heat-resistant metal structure, the deformation-resistant rib plate is arranged outside the radiation inner pipe, so that the problem that equipment is easy to break in the processes of installation, transportation and use is solved, and the radiation inner pipe can be used even if the radiation inner pipe is deformed and is stressed.

The radiation inner tube comprises the small hole tube, the tail end of the small hole tube is inclined towards the outlet end of the inner tube body, and when the radiation inner tube works normally, the small hole tube cannot influence the normal circular combustion in the radiation tube, but when the radiation tube is deformed, the distance between the local radiation tube and the radiation inner tube can be reduced or even blocked, and gas outside the inner tube body can enter the inner tube body through the small hole tube, so that the circular combustion is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a burner and a radiant inner tube structure of a conventional heat treatment furnace;

FIG. 2 is a schematic view of the structure of the radiation inner tube of the present application;

fig. 3 is a schematic structural view of a radiant tube according to the present application.

Icon: 100-radiating an inner tube; 110-an inner tube body; 120-small hole tube; 130-rib plates; 200-radiant tubes; 210-burner; 211-inner tube; 212-an outer tube; 213-exhaust channel; 214-a baffle ring; 220-radiating a tube body; 230-flue gas channel.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present application and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.

Referring to fig. 2, the present embodiment provides an inner tube of a radiant tube 200, including an inner tube body 110, the inner tube body 110 includes an air inlet end and an air outlet end, a small hole tube 120 communicated with the inside of the inner tube body 110 is disposed at the outer side of the inner tube body 110, an included angle between an axis of the small hole tube 120 and an axis of the inner tube body 110 is 10 ° -20 °, and the small hole tube 120 is obliquely disposed toward the air inlet end; the inner tube 110 and the small hole tube 120 are made of heat-resistant metal.

The inner tube of the radiant tube 200 in this embodiment is made of a heat-resistant metal material, and the metal material has a certain deformability, and is deformed instead of broken when subjected to an external force, so that the service life of the radiant tube can be prolonged to a certain extent.

In addition, the radiation inner tube 100 in this embodiment includes the small hole tube 120, and the end of the small hole tube 120 is inclined toward the outlet end of the inner tube 110, and when the radiation inner tube 100 is working normally, since the direction of the end of the small hole tube 120 connected to the inner tube 110 is opposite to the gas flowing direction in the inner tube 110, the direction of the end of the small hole tube 120 is opposite to the gas flowing direction outside the inner tube 110, so the gas outside the radiation inner tube 100 will not enter the inside of the radiation inner tube 100 through the small hole tube 120, and the normal circular combustion in the radiation tube 200 will not be affected. In order to keep the small hole tube 120 from affecting the normal operation of the radiation inner tube 100, the angle between the axis of the small hole tube 120 and the axis of the inner tube body 110 is set to be 10 ° -20 °, in particular, any value between 10 °, 12 °, 14 °, 16 °, 18 °, 20 ° or 10 ° -20 °, preferably the axis of the inner tube body 110 is set coplanar with the axis of the small hole tube 120. However, after the radiant tube 200 is deformed, the distance between the local radiant tube 200 and the radiant inner tube 100 may be reduced or even blocked, and at this time, the pressure of the gas outside the inner tube 110 may be greater than the pressure of the gas inside the inner tube 110, so that the gas outside the inner tube 110 enters the inner tube through the small hole tube 120, and the cyclic combustion is implemented. Further, the small hole pipe 120 in this embodiment also has a certain deformability, when the small hole pipe 120 is acted by an external force, the included angle between the small hole pipe 120 and the axis of the inner pipe 110 will be further reduced, so that the included angle between the gas direction of the end, connected with the inner pipe 110, of the small hole pipe 120 and the gas in the inner pipe 110 is smaller, the kinetic energy loss of the gas in the small hole pipe 120 entering the inner pipe 110 is reduced, and the efficiency of circular combustion is maintained.

In this embodiment, the small hole pipe 120 and the inner pipe body 110 may be welded or may be connected by other methods, specifically, a through hole may be formed in the inner pipe body 110, and then the small hole pipe 120 is inserted into the through hole and then welded or fixed by other methods; a step hole may be formed on the inner tube 110, where the aperture of the step hole near the inner side of the inner tube 110 is smaller than the aperture of the step hole near the outer side of the inner tube 110, so that the small hole tube 120 may be inserted into the step hole and then welded to the inner tube 110, and the small hole end of the step hole may also play a certain limiting role.

In this embodiment, the pore diameter of the small pore tube 120 is not particularly limited, specifically two or three centimeters and seven or eight centimeters may be selected according to the specification of the inner tube 110, and in general, the pore diameter of the small pore tube 120 is smaller, less dense pore diameter may be set, and the pore diameter of the small pore tube 120 is larger, and less dense pore diameter may be set.

In an alternative embodiment, the inner tube 110 is provided with a rib plate 130 along the axial direction of the inner tube 110, and the rib plates 130 are more than two and are sequentially arranged along the circumferential direction of the inner tube 110.

The rib plates 130 can play a role in reinforcing the inner tube 110, and can assist the inner tube 110 to resist external force, so as to reduce and alleviate the possibility of deformation of the inner tube 110. Specifically, the number of the rib plates 130 can be 2, 3, 4, 5, 6, 7, 8 or more, but the rib plates 130 are too dense to affect the radiation of heat, and the too sparse strengthening effect is not obvious; the cross-section of the rib 130 may be square, rectangular or other shape. The number of the rib plates 130 in the embodiment is 6, the radian between every two adjacent rib plates 130 is pi/3, the section of each rib plate 130 is square, and the rib plates 130 and the inner pipe body 110 can be fixed in a welding mode.

It should be noted that, although the rib 130 disposed annularly outside the inner tube 110 may also play a role in reinforcing the inner tube 110, the flow of the gas outside the inner tube 110 may be affected, and thus, it is preferable that the rib 130 be disposed along the circumferential direction of the inner tube 110.

In addition, the rib plate 130 in this embodiment can play a supporting role when the outer tube deforms to press the inner tube body 110, and can play a supporting role on the small hole tube 120 when the small hole tube 120 is pressed on the rib plate 130 by external force, so that the distance between the inner tube body 110 and the radiant tube 200 located outside thereof is not too small.

In an alternative embodiment, the small hole pipes 120 are provided with two or more rows along the circumferential direction of the inner pipe body 110, and each row of small hole pipes 120 includes two or more small hole pipes 120 provided along the axial direction of the inner pipe body 110.

In this embodiment, the small hole pipe 120 may be axially disposed along the inner pipe body 110, may be disposed from an air inlet end to an air outlet end of the inner pipe body 110, and may be provided with a break in the middle as required; adjacent rows of the perforated pipes 120 may be arranged thereto or may be staggered, preferably adjacent perforated pipes 120 are staggered.

In an alternative embodiment, the small hole tube 120 is uniformly welded to the inner tube 110.

In an alternative embodiment, the angle between the axis of the small bore tube 120 and the axis of the inner tube 110 is 15 °.

In another embodiment of the present application, as shown in fig. 3, a radiant tube 200 is provided, which includes a radiant tube body 220 made of heat-resistant metal, one end of the radiant tube body 220 is closed, the other end of the radiant tube body is provided with a burner 210, the burner 210 is provided with a gas inlet, an air inlet and a flue gas outlet, in any embodiment of the foregoing embodiment, the inner tube of the radiant tube 200 is disposed in the radiant tube body 220, the air inlet end of the inner tube body 110 is close to the burner 210 and a gap is disposed between the inner tube body 110 and the burner 210, the air outlet end of the inner tube body 110 is close to the closed end of the radiant tube body 220 and a gap is disposed between the inner tube body 110 and the closed end, a flue gas channel 230 is disposed between the inner tube body 110 and the radiant tube body 220, the air inlet end of the flue gas channel 230 is communicated with the air outlet end of the inner tube body 110, and the burner 210 are communicated.

Specifically, when the radiant tube 200 in this embodiment works normally, after the gas and the fuel gas, i.e. air, enter the burner 210 from the gas inlet and the air inlet respectively, the gas and the fuel gas are mixed and ignited to form high-temperature combustion products, and enter the inner tube 110 to continue to burn, after the mixed gas leaves the inner tube 110, the mixed gas flows into the flue gas channel 230 from the closed end of the radiant tube 200, and part of the flue gas leaving from the flue gas channel 230 is involved in the inner tube 110 to circulate when the mixed gas enters the inner tube 110, and part of the flue gas leaves from the flue gas outlet through the burner 210. When the radiant tube 200 or the inner tube 110 is deformed by external force, the flue gas channel 230 is narrowed and even a dead zone is formed locally, the flue gas in the flue gas channel 230 can also smoothly perform combustion cycle through the small hole tube 120.

In an alternative embodiment, an end of the small hole pipe 120 remote from the inner pipe body 110 abuts against an inner wall of the radiant tube body 220.

The small hole tube 120 is supported between the inner tube 110 and the radiant tube 220, which can support the inner tube 110, and during specific processing, the distance between the tail end of the small hole tube 120 and the outer surface of the inner tube 110 can be equal to the distance between the inner tube 110 and the radiant tube 220, so that the inner tube 110 can be conveniently and directly placed in the radiant tube 220, and the inner tube 110 can be supported and positioned. At this time, only the hanger or other structures are needed to further reinforce the inner tube 110, so that the inner tube 110 and the radiant tube 200 are convenient to assemble.

At this time, since the outlet end face of the end of the small hole tube 120 is generally perpendicular to the axis of the small hole tube 120, when the end of the small hole tube 120 abuts against the radiant tube 220, an included angle is also formed between the outlet end face of the end of the small hole tube 120 and the radiant tube 220, that is, the conduction of the small hole tube 120 is not affected if necessary.

In an alternative embodiment, the burner 210 includes an inner tube 211, an outer tube 212, and an exhaust channel 213 disposed between the inner tube 211 and the outer tube 212, wherein a baffle ring 214 is disposed at one end of the inner tube 211 near the radiant inner tube 100, an air inlet is disposed in the middle of the baffle ring 214, and the inside of the radiant tube 220 is communicated with the flue gas outlet through the exhaust channel 213.

In this embodiment, after the gas and the combustion-supporting gas, i.e. air, enter the burner 210 from the gas inlet and the air inlet respectively, the gas and the air enter the inner tube 110 from the gas inlet to continue burning, and the flue gas part leaving the flue gas channel 230 is involved in the inner tube 110 to circulate when the mixed gas enters the inner tube 110, and the rest leaves from the flue gas outlet through the exhaust channel 213. The burner 210 comprises an inner tube 211, an outer tube 212 and an exhaust channel 213, which can separate gases with different flow directions on the one hand, and can heat fuel gas and combustion-supporting gas on the other hand.

In an alternative embodiment, the baffle ring 214 is gradually inclined toward the direction of the radiant inner tube 100 along the direction approaching the axis of the inner tube 211, so that the smoke gas, which normally flows, tends to enter the exhaust channel 213, moves to the inner side of the inner tube 110 along the baffle ring 214 only when the smoke gas is sucked by the combustion gas and the combustion-supporting gas.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The radiation inner tube comprises an inner tube body, wherein the inner tube body comprises an air inlet end and an air outlet end, and is characterized in that a small hole tube communicated with the inside of the inner tube body is arranged on the outer side of the inner tube body, an included angle between the axis of the small hole tube and the axis of the inner tube body is 10-20 degrees, and the small hole tube is obliquely arranged towards the air inlet end; the inner pipe body and the small hole pipe are made of heat-resistant metal materials.

2. The radiant inner tube of claim 1, wherein the inner tube body is provided with rib plates along the axial direction of the inner tube body, and the rib plates are more than two and are sequentially arranged along the circumferential direction of the inner tube body.

3. The radiant inner tube of claim 1, wherein the small bore tubes are arranged in two or more rows along a circumference of the inner tube body, each row of small bore tubes comprising two or more small bore tubes arranged axially along the inner tube body.

4. A radiant inner tube as in claim 3 wherein said small bore tube is uniformly welded to said inner tube body.

5. The radiant inner tube of claim 1, wherein the orifice tube axis is at an angle of 15 ° to the inner tube body axis.

6. The radiant inner tube of claim 1, wherein the heat resistant metal is Cr25Ni35Nb heat resistant cast steel.

7. The utility model provides a radiant tube, includes the radiant tube body of heat-resisting metal material, radiant tube body one end is sealed, the other end is provided with the nozzle, be provided with coal gas entry, air inlet and flue gas outlet on the nozzle, its characterized in that, any one of claims 1-6 the radiant tube sets up in the radiant tube body, the inlet end of inner tube body be close to the nozzle and with be provided with the clearance between the nozzle, the outlet end of inner tube body be close to the closed end of radiant tube body and with be provided with the clearance between the closed end, be provided with the flue gas passageway between inner tube body and the radiant tube body, the inlet end of flue gas passageway communicates with the outlet end of inner tube body, the outlet end of flue gas passageway with the nozzle intercommunication.

8. The radiant tube of claim 7 wherein an end of the small bore tube remote from the inner tube body abuts an inner wall of the radiant tube body.

9. The radiant tube of claim 8 wherein the burner comprises an inner tube, an outer tube and an exhaust passage disposed between the inner tube and the outer tube, wherein a baffle ring is disposed at one end of the inner tube adjacent to the inner tube, an air inlet is disposed in the middle of the baffle ring, and the interior of the radiant tube is communicated with the flue gas outlet through the exhaust passage.

10. The radiant tube of claim 9 wherein the baffle ring is progressively inclined in a direction toward the inner tube axis toward the inner tube.