Converter tube heat dissipation structure and converter

Abstract

The invention provides a conversion tube heat dissipation structure and a conversion furnace. The conversion tube heat dissipation structure comprises a conversion tube, a gas collecting tube and a heat dissipation sleeve, the conversion pipe comprises a heat preservation pipe section and a heat dissipation pipe section, and the gas collecting pipe is communicated with the heat dissipation pipe section; the heat dissipation sleeve is arranged on the peripheral side of the heat dissipation pipe section, the heat dissipation sleeve and the conversion pipe are arranged in a spaced mode, a heat dissipation cavity is formed between the inner side wall of the heat dissipation sleeve and the outer side wall of the conversion pipe, the heat dissipation cavity is arranged around the heat dissipation pipe section, a plurality of through holes are formed in the pipe wall of the heat dissipation sleeve in the circumferential direction, and the through holes communicate with the heat dissipation cavity. And the opening areas of the through holes formed in the circumferential direction are gradually increased from the first end to the second end of the heat dissipation sleeve. Compared with the prior art, the opening area of the through hole in the heat dissipation sleeve is gradually increased from the first end to the second end, so that the outlet area through which the hot air flow in the heat dissipation cavity can flow out is increased, the temperature of the heat dissipation pipe section is gradually reduced from the first end to the second end of the heat dissipation sleeve, the temperature gradient is slowed down, and the heat dissipation efficiency is improved. And the thermal stress borne by the heat dissipation pipe section of the conversion pipe is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of reforming furnaces, and particularly to a reforming tube heat dissipation structure and a reforming furnace. Background Art

[0002] A reforming furnace is a key device in the chemical and petrochemical industries for converting raw material gas or liquid hydrocarbons into synthesis gas (mainly composed of hydrogen and carbon monoxide), and is commonly used in ammonia, methanol production, and the manufacture of synthetic fuels. The reactions in the reforming furnace usually occur at high temperatures to promote the reforming reaction between the raw materials and steam.

[0003] The reforming tube is a key component of the reforming furnace. The outside of the reforming tube is wrapped with a heat insulation layer. The inside of the reforming tube is filled with a catalyst, and the gas to be reacted is introduced. The reforming reaction occurs in the presence of high temperature and the catalyst. The reformed gas needs to enter the gas collecting pipe for collection and transportation to the next process. The gas temperature inside the reforming tube is extremely high, usually reaching 800 - 900 °C. Due to the different materials of the reforming tube and the gas collecting pipe, the gas collecting pipe cannot withstand such a high temperature. The gas in the reforming tube section needs to be cooled by heat dissipation before entering the gas collecting pipe, so as to protect the gas collecting pipe from being damaged by high temperature. By removing the outer heat insulation layer from a part of the reforming tube section adjacent to the gas collecting pipe, the reforming tube directly exchanges heat with the space in the external environment, thereby achieving temperature reduction.

[0004] However, adopting the above heat dissipation method, the ultra-high temperature reforming tube section is in direct contact with the low-temperature air in the external environment, resulting in a large temperature gradient, causing each part of the tube section to expand or contract at different rates, and generating thermal stress in the tube section. The thermal stress will cause the tube section to have structural deformation, thus affecting the alignment and sealing performance of the equipment. The tube section will also have cracks and damage on the tube body under the influence of thermal stress, not only reducing the service life, but also requiring shutdown for repair, affecting production. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a reforming tube heat dissipation structure and a reforming furnace to solve the problem of damage to the reforming tube due to excessive thermal stress.

[0006] To solve the above technical problems, the following technical solutions are provided in the embodiments of the present application:

[0007] The first aspect of the present disclosure provides a reforming tube heat dissipation structure, including a reforming tube, a gas collecting pipe, and a heat dissipation sleeve; the reforming tube includes a heat insulation tube section and a heat dissipation tube section, and the gas collecting pipe is communicated with the heat dissipation tube section;

[0008] The heat dissipation sleeve is arranged on the outer peripheral side of a part of the heat dissipation tube section. The first end of the heat dissipation sleeve is connected to the heat insulation tube section, the second end extends towards the gas collecting pipe, and there is a gap between the second end and the pipe wall of the gas collecting pipe;

[0009] Among them, the heat dissipation sleeve and the conversion tube are arranged at intervals, so that a heat dissipation cavity is formed between the inner side wall of the heat dissipation sleeve and the outer side wall of the conversion tube. The heat dissipation cavity is arranged around the heat dissipation tube section. A plurality of through holes are arranged circumferentially on the tube wall of the heat dissipation sleeve. The through holes are communicated with the heat dissipation cavity, and the opening area of the circumferentially arranged through holes gradually increases from the first end to the second end of the heat dissipation sleeve.

[0010] In some embodiments of the first aspect of the present disclosure, an air inlet is further included. The air inlet is arranged at the second end of the heat dissipation sleeve. The air inlet is an annular opening arranged around the conversion tube. The air inlet is communicated with the heat dissipation cavity and is also communicated with the through holes arranged on the tube wall of the heat dissipation sleeve.

[0011] In some embodiments of the first aspect of the present disclosure, a partition ring plate is further included. The partition ring plate is an annular plate. At least one partition ring plate is arranged in the heat dissipation cavity and divides the heat dissipation cavity into at least two chambers. The partition ring plate has an inner ring end and an outer ring end; the inner ring end is fixedly arranged circumferentially with the outer wall of the conversion tube, and the outer ring end is fixedly arranged circumferentially with the inner wall of the heat dissipation sleeve; and a plurality of ring plate holes are arranged on the end face of the partition ring plate, and the ring plate holes are used to communicate the chambers in the heat dissipation cavity.

[0012] In some embodiments of the first aspect of the present disclosure, there are two partition ring plates, which are arranged at intervals in the heat dissipation cavity and divide the heat dissipation cavity into three chambers. The opening area of the ring plate holes on the partition ring plate close to the air inlet is larger than the opening area of the ring plate holes on the other partition ring plate.

[0013] In some embodiments of the first aspect of the present disclosure, the apertures of the through holes arranged on the tube wall of the heat dissipation sleeve are the same. Then, the opening density of the through holes close to the first end of the heat dissipation sleeve is less than the opening density of the through holes close to the second end; or,

[0014] The opening density of the through holes close to the first end of the heat dissipation sleeve is equal to the opening density of the through holes close to the second end, and the aperture of the through holes close to the second end is larger than the aperture of the through holes close to the first end; or,

[0015] The opening density and aperture of the through holes close to the first end of the heat dissipation sleeve are both less than the opening density and aperture of the through holes close to the second end of the heat dissipation sleeve.

[0016] In some embodiments of the first aspect of the present application, a heat dissipation support plate is further included. A plurality of heat dissipation support plates are arranged circumferentially on the outer peripheral side of the conversion tube. One end is arranged at the air inlet, and the other end extends into the heat dissipation cavity along the length direction of the conversion tube.

[0017] In some embodiments of the first aspect of the present disclosure, one side of the heat dissipation support plate is fixedly disposed obliquely on the outer peripheral side of the conversion tube, and the other side extends towards the heat dissipation sleeve. Moreover, the other sides of two adjacent heat dissipation support plates are both disposed obliquely close to each other, so that the other sides of two adjacent heat dissipation support plates converge to form a vertex structure, and the vertex structure is used to abut against the inner wall of the heat dissipation sleeve.

[0018] In some embodiments of the first aspect of the present disclosure, the inside of the conversion tube further includes a lining tube and a lining heat insulation layer. The lining heat insulation layer wraps the lining tube, and an outer heat insulation layer is disposed on the outer side wall of a part of the conversion tube to form a heat insulation pipe section.

[0019] In some embodiments of the first aspect of the present disclosure, the lining tube includes a first lining tube and a second lining tube. The first lining tube is inserted into the second lining tube, and the second lining tube extends into the gas collecting pipe.

[0020] The second aspect of the present disclosure provides a reforming furnace, including a conversion tube heat dissipation structure. The conversion tube heat dissipation structure includes a conversion tube, a gas collecting pipe, and a heat dissipation sleeve; the conversion tube includes a heat insulation pipe section and a heat dissipation pipe section, and the gas collecting pipe is communicated with the heat dissipation pipe section;

[0021] The heat dissipation sleeve is disposed on the outer peripheral side of a part of the heat dissipation pipe section. The first end of the heat dissipation sleeve is connected to the heat insulation pipe section, the second end extends towards the gas collecting pipe, and there is a gap between the second end and the pipe wall of the gas collecting pipe;

[0022] Wherein, the heat dissipation sleeve is disposed at an interval from the conversion tube, so that a heat dissipation cavity is formed between the inner side wall of the heat dissipation sleeve and the outer side wall of the conversion tube. The heat dissipation cavity is disposed around the heat dissipation pipe section. A plurality of through holes are circumferentially provided on the pipe wall of the heat dissipation sleeve. The through holes are communicated with the heat dissipation cavity, and the opening area of the circumferentially provided through holes gradually increases from the first end to the second end of the heat dissipation sleeve.

[0023] Compared with the prior art, for the conversion tube heat dissipation structure and the reforming furnace provided by the present disclosure, since the opening area of the through holes on the heat dissipation sleeve gradually increases from the first end to the second end, the outlet area for the hot air flow in the heat dissipation cavity to flow out increases, so that the temperature of the heat dissipation pipe section of the conversion tube gradually decreases along the first end to the second end of the heat dissipation sleeve, thereby slowing down the temperature gradient and reducing the thermal stress suffered by the heat dissipation pipe section of the conversion tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0025] Figure 1 Schematically shows an overall structural schematic diagram of the conversion tube heat dissipation structure;

[0026] Figure 2 Schematically shows a schematic diagram of the heat dissipation sleeve structure of the conversion tube heat dissipation structure;

[0027] Figure 3 Schematically shows a schematic diagram of the structure of the heat dissipation sleeve of another conversion tube heat dissipation structure;

[0028] Figure 4 Schematically shows a schematic diagram of the overall structure of another conversion tube heat dissipation structure;

[0029] Figure 5 Schematically shows a schematic diagram of the overall structure of yet another conversion tube heat dissipation structure;

[0030] Figure 6 Schematically shows a schematic diagram of the partition ring plate structure of the conversion tube heat dissipation structure;

[0031] Figure 7 Schematically shows a schematic cross-sectional view of the apex angle structure formed by the heat dissipation support plate in the conversion tube heat dissipation structure.

[0032] Explanation of the reference numerals in the drawings:

[0033] 10. Conversion tube; 11. Insulation pipe section; 12. Heat dissipation pipe section; 20. Gas collector; 30. Heat dissipation sleeve; 31. Through hole; 32. Air inlet; 40. Heat dissipation cavity; 50. Partition ring plate; 51. Ring plate hole; 60. Heat dissipation support plate; 70. Inner lining pipe; 71. First inner lining pipe; 72. Second inner lining pipe; 80. Inner lining heat insulation layer; 90. Outer insulation layer. Detailed implementation manners

[0034] Hereinafter, the exemplary embodiments disclosed in the present application will be described in more detail with reference to the drawings. Although the exemplary embodiments disclosed in the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be completely conveyed to those skilled in the art.

[0035] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should have the ordinary meaning understood by those skilled in the art to which the present application belongs.

[0036] In the related art, a high-temperature reformer is an industrial device specifically designed for chemical conversion under high-temperature conditions. This type of reformer is usually used to convert one substance into another, usually involving catalytic reactions or pyrolysis processes at high temperatures. It is mainly applied in industries such as synthetic ammonia, chemical engineering, and petrochemical engineering.

[0037] For example, the dry reforming reformer is mainly applied to similar process devices such as the device for synthesizing syngas by dry reforming of carbon dioxide and low-carbon alkanes. The dry reforming process is a potential environmental protection technology that can use carbon dioxide in industrial waste gas as a raw material and simultaneously produce valuable syngas, which can be further converted into chemicals, fuels or electricity. Among them, the conversion tube and the collecting pipe are key components of the reformer. The dry reforming process is a process of converting methane and carbon dioxide into syngas (mainly carbon monoxide (CO) and hydrogen (H2)), and this process occurs in the conversion tube in the reformer. The inside of the conversion tube is filled with a catalyst, usually a nickel-based catalyst, which can promote the reaction between methane and carbon dioxide. The conversion tube needs to work under high-temperature conditions, which is usually achieved by an external heating furnace. The collecting pipe is located downstream of the conversion tube. The main function of the collecting pipe is to collect the syngas generated in the conversion tube and guide it to the subsequent processing system. In the dry reforming reformer, the outlet of the conversion tube is directly connected to the collecting pipe. After the reaction in the conversion tube is completed, the generated syngas (containing CO and H2), unreacted gases and by-products will enter the collecting pipe.

[0038] For the consideration of reducing the equipment manufacturing cost, the material of the conversion tube can withstand ultra-high temperature (800 - 900 °C), while the material of the collecting pipe does not have the characteristic of withstanding ultra-high temperature. Therefore, before the ultra-high temperature gas reaches the outlet of the conversion tube and enters the collecting pipe, it will pass through a heat dissipation pipe section for cooling and heat dissipation, that is, a part of the outer wall of the outlet section of the conversion tube is not provided with a heat insulation layer and is directly in contact with the outside to dissipate heat until the temperature drops to 200 - 300 °C and then enters the collecting pipe. However, adopting the above-mentioned cooling and heat dissipation method, the ultra-high temperature conversion tube section is in direct contact with the low-temperature air in the external environment, resulting in a large temperature gradient, causing each part of the tube section to expand or contract at different rates, and generating a large thermal stress on the tube body of the conversion tube.

[0039] Therefore, in order to reduce the thermal stress, a heat dissipation sleeve is arranged on the outer side of the heat dissipation pipe section near the outlet of the conversion tube. A heat dissipation cavity is formed between the heat dissipation sleeve and the conversion tube. The gas in the heat dissipation cavity is heated by thermal radiation to form a gas insulation layer to surround the conversion tube, and heat dissipation is carried out by interacting with the low-temperature air outside through the through holes arranged on the wall of the heat dissipation sleeve, thereby avoiding the direct contact between the ultra-high temperature conversion tube section and the low-temperature air in the external environment, and thus reducing the thermal stress borne by the conversion tube.

[0040] Embodiment 1

[0041] Refer to the attached Figures 1-3 , Embodiment 1 of the present disclosure proposes a heat dissipation structure for a conversion tube 10, including a conversion tube 10, a collecting pipe 20, and a heat dissipation sleeve 30;

[0042] The conversion tube 10 includes a heat insulation pipe section 11 and a heat dissipation pipe section 12, and the collecting pipe 20 is communicated with the heat dissipation pipe section 12;

[0043] A heat dissipation sleeve 30 is disposed on the outer peripheral side of the heat dissipation pipe section 12. The first end of the heat dissipation sleeve 30 is connected to the heat insulation pipe section 11, and the second end extends towards the gas collecting pipe 20, and there is a gap between the second end and the pipe wall of the gas collecting pipe 20;

[0044] Wherein, the heat dissipation sleeve 30 is arranged at an interval from the conversion pipe 10, so that a heat dissipation cavity 40 is formed between the inner side wall of the heat dissipation sleeve and the outer side wall of the conversion pipe 10. The heat dissipation cavity 40 is arranged around the heat dissipation pipe section 12. A plurality of through holes 31 are arranged circumferentially on the pipe wall of the heat dissipation sleeve 30. The through holes 31 are communicated with the heat dissipation cavity 40, and the opening area of the circumferentially arranged through holes 31 gradually increases from the first end to the second end of the heat dissipation sleeve 30.

[0045] Specifically, one end of the heat insulation pipe section 11 of the conversion pipe 10 is connected to the furnace bottom of the reformer, and the other end is a heat dissipation pipe section 12, and the heat dissipation pipe section 12 is used to communicate with the gas collecting pipe 20;

[0046] The material of the heat dissipation sleeve 30 can be a super high temperature resistant metal, such as austenitic stainless steel, nickel-based superalloy, cobalt-based alloy, refractory metal-based alloy: including alloys based on tungsten, molybdenum, tantalum, and niobium. The material of the heat dissipation sleeve 30 can include but is not limited to one of them.

[0047] The inner diameter of the heat dissipation sleeve 30 is larger than the outer contour of the heat dissipation pipe section 12 of the conversion pipe 10, so that there is a gap between them to form an annular heat dissipation cavity 40. The air in the heat dissipation cavity 40 is heated by the high-temperature thermal radiation of the wall of the conversion pipe 10, and the heat is gradually dissipated through a plurality of through holes 31 arranged circumferentially along the heat dissipation sleeve 30. During this process, the high-temperature gas in the heat dissipation cavity 40 surrounds the heat dissipation pipe section 12 to form a heat insulation layer, and this heat insulation layer prevents the super high temperature heat dissipation pipe section 12 from directly contacting the external low-temperature air.

[0048] And the total opening area of the circumferentially arranged through holes 31 gradually increases from the first end to the second end of the heat dissipation sleeve 30. Among them, the first end refers to the end of the heat dissipation sleeve 30 close to the heat insulation pipe section 11, and the second end refers to the end of the heat dissipation sleeve 30 close to the gas collecting pipe 20.

[0049] Wherein, when the aperture sizes of the through holes 31 are equal, the number of the through holes 31 arranged circumferentially on the heat dissipation sleeve 30 can be gradually increased from the first end to the second end of the heat dissipation sleeve 30, so as to increase the total opening area and improve the heat dissipation effect.

[0050] For example, the through-holes 31 are arranged circumferentially around the heat dissipation sleeve 30. The circumferentially arranged through-holes 31 can be divided into multiple layers along the length direction of the heat dissipation sleeve 30. And from the first end to the second end of the heat dissipation sleeve 30, the number of through-holes 31 in each layer increases. The number of through-holes 31 in the layer close to the first end is the least, while the number of through-holes 31 in the layer close to the second end is the most.

[0051] When the aperture sizes of the through-holes 31 are inconsistent, the aperture of the through-holes 31 close to the second end is always larger than that of the through-holes 31 close to the first end. The number of through-holes 31 can be evenly distributed or unevenly distributed along the circumference of the heat dissipation sleeve 30. If it is unevenly distributed, the number of through-holes 31 close to the second end is more than that of the through-holes 31 close to the first end.

[0052] Through the above adjustments of the aperture sizes and the number of the through-holes 31, the total opening area of the through-holes 31 gradually increases from the first end to the second end of the heat dissipation sleeve 30. Furthermore, the heat dissipation rate and the heat flux density from the first end to the second end of the heat dissipation sleeve 30 gradually increase, thereby gradually reducing the temperature difference between the heat dissipation pipe section 12 and the external environment.

[0053] Among them, the heat flux density refers to the amount of heat passing through a unit area per unit time. A higher heat flux density means that the heat dissipation sleeve 30 can handle more heat, indicating better heat dissipation effect. That is, the larger the opening area of the through-holes 31 on the heat dissipation sleeve 30, the better the heat dissipation effect of the part of the heat dissipation pipe section 12 provided with the heat dissipation sleeve 30.

[0054] The heat on the wall of the conversion pipe 10 is transferred to the air in the heat dissipation cavity 40 by means of thermal radiation. The air in the heat dissipation cavity 40 escapes through the through-holes 31. At the same time, the heat dissipation sleeve 30 is heated by thermal radiation and thermal conduction and rises in temperature and contacts the external low-temperature environment, which can also achieve the heat dissipation effect. At the same time, the heat dissipation sleeve 30 is arranged on the outer peripheral side of the heat dissipation pipe section 12, forming a heat preservation protection for the heat dissipation pipe section 12 of the conversion pipe 10. The heat is gradually dissipated through the through-holes 31, avoiding direct contact with the external environment, which may cause a cliff-like sharp drop in the temperature gradient. At the same time, it also avoids the influence of external weather factors on the heat dissipation pipe section 12, such as wind blowing. The heat dissipation pipe section 12 will not be cooled, causing the external pipe body to contract sharply, thereby reducing the thermal stress borne by the heat dissipation pipe section 12, improving the safety of equipment use and extending the service life of the conversion pipe 10.

[0055] As the opening area of the through-holes 31 on the heat dissipation sleeve 30 gradually increases from the first end to the second end, the outlet area for the hot air flow in the heat dissipation cavity 40 to flow out increases, thereby gradually reducing the temperature of the heat dissipation pipe section 12 along the first end to the second end of the heat dissipation sleeve 30, thus slowing down the temperature gradient.

[0056] Moreover, since the heat dissipation sleeve 30 is arranged on the outer peripheral side of a part of the heat dissipation pipe section 12, the part of the heat dissipation pipe section 12 with the heat dissipation sleeve 30 on the outer peripheral side is cooled step by step. After the heat dissipation of the heat dissipation pipe section 12 through the heat dissipation sleeve 30, the temperature difference between the heat dissipation pipe section 12 and the external environment is reduced. Then, another part of the heat dissipation pipe section 12, that is, the part of the heat dissipation pipe section 12 from the lower end of the heat dissipation sleeve 30 to the upper end of the gas collecting pipe 20, is directly exposed to the external environment for rapid heat dissipation, so as to reduce the temperature of this part of the heat dissipation pipe section 12 to the temperature that the gas collecting pipe 20 can withstand. Since this part of the heat dissipation pipe section 12 is close to the gas collecting pipe 20 and needs to dissipate heat and cool down quickly, the gas collecting pipe 20 is protected from being damaged by high temperature.

[0057] By arranging the heat dissipation sleeve 30 on a part of the heat dissipation pipe section 12, the temperature gradient of the heat dissipation pipe section 12 of the conversion pipe 10 decreases slowly, avoiding a cliff-like drop. After the other part of the heat dissipation pipe section 12 is cooled, the temperature difference from the external environment is reduced. At this time, the thermal stress generated by the direct heat dissipation method will not have an overly destructive impact on the heat dissipation pipe section 12, improving safety.

[0058] Further, referring to the attached Figures 1-3 figure, in some embodiments, the heat dissipation structure of the conversion pipe 10 further includes:

[0059] An air inlet 32, the air inlet 32 is arranged at the second end of the heat dissipation sleeve 30, the air inlet 32 is an annular opening surrounding the conversion pipe 10, the air inlet 32 is communicated with the heat dissipation cavity 40, and is communicated with the through hole 31 arranged on the pipe wall of the heat dissipation sleeve 30.

[0060] Specifically, in order to improve the fluidity of the hot air in the heat dissipation cavity 40 and enhance the heat dissipation effect by using the method of heat convection, the heat dissipation and cooling speed of the heat dissipation pipe section 12 is accelerated.

[0061] In the technical solution adopted by the present disclosure, an air inlet 32 is opened at the second end of the heat dissipation sleeve 30. The air inlet 32 is an annular opening. The inner side of the annular opening is the outer wall of the heat dissipation pipe section 12, and the outer side is the inner wall of the heat dissipation sleeve 30; that is, the second end of the heat dissipation sleeve 30 is spaced from the outer pipe wall of the conversion pipe 10, thus forming the air inlet 32.

[0062] The hot air in the heat dissipation cavity 40 diffuses to the outside of the heat dissipation sleeve 30 through the through hole 31, and the low-temperature air in the external environment enters from the air inlet 32, thus forming a circulating flow to enhance the heat dissipation effect. The process is that the air temperature inside the heat dissipation cavity 40 rises, thus forming heat convection with the lower-temperature air outside the heat dissipation cavity 40. The high-temperature gas in the heat dissipation cavity 40 flows to the outside of the heat dissipation cavity 40 through the through hole 31 on the heat dissipation cavity 40 to achieve heat dissipation.

[0063] Among them, the air inlet 32 is combined with the through hole 31 on the heat dissipation sleeve 30. Since the opening area of the through hole 31 gradually increases from the first end to the second end of the heat dissipation sleeve 30, after the external air forms a heat convection with the air inside the heat dissipation cavity 40, the heat dissipation rate and the heat dissipation amount from the first end to the second end of the heat dissipation sleeve 30 gradually increase. As the heat dissipation effect gradually increases, the temperature of the part of the heat dissipation pipe section 12 sleeved by the heat dissipation sleeve 30 gradually decreases. The temperature difference between the heat dissipation pipe section 12 near the second end of the heat dissipation sleeve 30 and the external environment is smaller than the temperature difference between the heat dissipation pipe section 12 near the first end of the heat dissipation sleeve 30 and the external environment.

[0064] As Figure 4 shown, the second end of the heat dissipation sleeve 30 can also extend along the circumferential direction of the conversion tube 10 away from the tube wall of the conversion tube 10, so as to expand the inner diameter of the air inlet 32, making it easier for air to enter the heat dissipation cavity 40 through the air inlet 32 and further improving the heat dissipation effect.

[0065] Furthermore, referring to the appendix Figures 5-6 , in some embodiments, the heat dissipation structure of the conversion tube 10 further includes:

[0066] A partition ring plate 50, the partition ring plate 50 is an annular plate, at least one partition ring plate 50 is arranged in the heat dissipation cavity 40, and the heat dissipation cavity 40 is divided into at least two chambers. The partition ring plate 50 has an inner ring end and an outer ring end; the inner ring end is fixedly arranged circumferentially on the outer wall of the conversion tube 10, and the outer ring end is fixedly arranged circumferentially on the inner wall of the heat dissipation sleeve 30; and a plurality of ring plate holes 51 are provided on the end face of the partition ring plate 50, and the ring plate holes 51 are used to communicate the chambers in the heat dissipation cavity 40.

[0067] Specifically, in order to set heat dissipation regions with different heat dissipation rates on the heat dissipation sleeve 30 to facilitate the regulation of the temperature gradient of the heat dissipation pipe section 12. By arranging a partition ring plate 50 in the heat dissipation cavity 40, the heat dissipation cavity 40 is divided into two chambers; at this time, the partition ring plate 50 can be arranged in the middle of the heat dissipation cavity 40 to evenly divide the two chambers. A plurality of ring plate holes 51 are provided on the end face of the partition ring plate 50, and the ring plate holes 51 are circumferentially arranged on the partition ring plate 50 and are used to communicate the chambers divided by the heat dissipation cavity 40.

[0068] Among them, the size of the aperture of the ring plate hole 51 and the number of the circumferentially spaced ring plate holes 51 can be adjusted, so as to change the flow velocity and flow rate of the gas in the heat dissipation cavity 40. The larger the aperture of the ring plate hole 51 and the more the number, the smaller the obstruction of the partition ring plate 50 to the gas flow in the heat dissipation cavity 40, the smoother the flow, and the better the heat dissipation effect.

[0069] Meanwhile, the tube wall of the heat dissipation sleeve 30 serves as the outer wall of the heat dissipation cavity 40. After the heat dissipation cavity 40 is partitioned, the through holes 31 on the heat dissipation sleeve 30 corresponding to different chambers are also different. The total opening area of the through holes 31 corresponding to the chamber close to the heat preservation pipe section 11 is smaller than the total opening area of the through holes 31 corresponding to the chamber far from the heat preservation pipe section 11. Through the combination of the above two structural designs, the heat dissipation rates of different heat dissipation regions are regulated.

[0070] In some embodiments, a plurality of partition ring plates 50 may be further disposed in the heat dissipation cavity 40. The plurality of partition ring plates 50 are spaced apart, and the total opening area of the upper ring plate holes 51 of the partition ring plate 50 close to the first end of the heat dissipation sleeve 30 is smaller than the total opening area of the upper ring plate holes 51 of the partition ring plate 50 far from the second end of the heat dissipation sleeve 30. To ensure that the heat dissipation effect of the heat dissipation sleeve 30 gradually increases from the first end to the second end, so that the conversion tube 10 gradually cools down.

[0071] Wherein, both sides of the partition ring plate 50 respectively abut against the outer side wall of the conversion tube 10 and the inner side wall of the heat dissipation sleeve 30, providing support for the heat dissipation tube sleeve and preventing the structure from deforming due to the influence of thermal stress on its own and the tube wall of the conversion tube 10.

[0072] Further, referring to the appendix Figure 5 , in some embodiments, there are two partition ring plates 50, and they are spaced apart in the heat dissipation cavity 40, dividing the heat dissipation cavity 40 into three chambers. The opening area of the ring plate holes 51 on the partition ring plate 50 close to the air inlet 32 is larger than the opening area of the ring plate holes 51 on the other partition ring plate 50.

[0073] Specifically, the partition ring plate 50 is successively the first ring plate and the second ring plate from top to bottom; the heat dissipation cavity 40 is divided into the first chamber, the second chamber and the third chamber successively from top to bottom by using the ring plates;

[0074] Wherein, the total area of the ring plate holes 51 opened on the end face of the first ring plate is smaller than the total area of the ring plate holes 51 opened on the end face of the second ring plate, and the total areas of the through holes 31 communicated with the first chamber, the second chamber and the third chamber respectively decrease step by step. The heat dissipation sleeve 30 is divided into three heat dissipation regions with different heat dissipation rates corresponding to the three chambers, and the heat dissipation rate increases from the first chamber to the third chamber.

[0075] Further, referring to the appendix Figures 1-5 , in some embodiments, the apertures of the through holes 31 provided on the tube wall of the heat dissipation sleeve 30 are the same, then the opening density of the through holes 31 close to the first end of the heat dissipation sleeve 30 is smaller than the opening density of the through holes 31 close to the second end; or,

[0076] The opening density of the through holes 31 near the first end of the heat dissipation sleeve 30 is equal to that of the through holes 31 near the second end, and the aperture of the through holes 31 near the second end is larger than that of the through holes 31 near the first end; or,

[0077] The opening density and aperture of the through holes 31 near the first end of the heat dissipation sleeve 30 are both smaller than those of the through holes 31 near the second end of the heat dissipation sleeve 30.

[0078] Specifically, in order to enable the heat dissipation sleeve 30 to gradually dissipate heat from the heat dissipation pipe section 12 of the conversion pipe 10, in the technical solution adopted in the present disclosure, by changing the aperture of the through holes 31 and the density of the through holes 31, the total opening area of the through holes 31 from the first end to the second end of the heat dissipation sleeve 30 gradually increases, and in combination with the air inlet 32, the fluidity in the heat dissipation cavity 40 is gradually improved, and the increase in fluidity causes the temperature of the conversion pipe 10 to gradually decrease. Among them, the opening density refers to the percentage of the pores of the through holes 31 in a certain area of the tube wall of the heat dissipation sleeve 30.

[0079] Further, referring to Appendix Figure 5 and 7 , in some embodiments, there are heat dissipation support plates 60, and a plurality of heat dissipation support plates 60 are circumferentially arranged on the outer peripheral side of the conversion pipe 10, with one end arranged at the air inlet 32 and the other end extending into the heat dissipation cavity 40 along the length direction of the conversion pipe 10.

[0080] Specifically, in order to improve the heat dissipation rate of the heat dissipation pipe section 12 near the second end of the heat dissipation sleeve 30 and quickly reduce the temperature difference between the heat dissipation pipe section 12 near the second end of the heat dissipation sleeve 30 and the external environment, in the technical solution adopted in the present disclosure, there are multiple heat dissipation support plates 60 arranged along the length direction of the conversion pipe 10, and the heat dissipation support plates 60 are strip-shaped plates.

[0081] Both sides of the heat dissipation support plate 60 are respectively abutted against the outer side wall of the conversion pipe 10 and the inner side wall of the heat dissipation sleeve 30. A plurality of heat dissipation support plates 60 are circumferentially spaced on the outer peripheral side of the conversion pipe 10 and are made of a high-temperature resistant and heat-conducting metal material, which can conduct the heat of the heat dissipation pipe section 12 to the heat dissipation sleeve 30 and accelerate the heat dissipation speed by means of heat conduction, so as to achieve rapid heat dissipation. And in order to further improve the heat dissipation effect, a heat dissipation plate or heat dissipation fin structure (not shown in the figure) can be arranged on the outer side wall of the heat dissipation sleeve 30 to increase the contact area between the heat dissipation sleeve 30 and the external air and achieve a better heat dissipation effect.

[0082] Among them, one side of the heat dissipation support plate 60 is circumferentially spaced along the outer peripheral side of the conversion pipe 10, and the other side is abutted against the inner side wall of the heat dissipation sleeve 30, so as to improve the support effect and the stability of the structure, and avoid the heat dissipation sleeve 30 from being dented when impacted by external force, resulting in a decrease in the volume of the internal heat dissipation cavity 40 and affecting the heat dissipation effect.

[0083] Further, referring to the attached Figure 7 , in some embodiments, one side of the heat dissipation support plate 60 is fixedly disposed obliquely on the outer peripheral side of the conversion tube 10, and the other side extends toward the heat dissipation sleeve 30, and the other sides of two adjacent heat dissipation support plates 60 are disposed close to each other obliquely, so that the other sides of two adjacent heat dissipation support plates 60 converge to form a vertex structure, and the vertex structure is used to abut against the inner wall of the heat dissipation sleeve 30.

[0084] Specifically, in order to further improve the heat dissipation effect of the heat dissipation cavity 40 and the support effect on the heat dissipation sleeve 30, in the technical solution adopted by the present disclosure, two adjacent heat dissipation support plates 60 are fixedly disposed on the outer peripheral side of the conversion tube 10 on one side, and the other sides are inclined and close to each other, and two adjacent heat dissipation support plates 60 are close to each other to form a vertex structure, and the vertex structure is made to abut against the outer peripheral side of the heat dissipation sleeve 30. A plurality of vertex structures are circumferentially distributed on the inner side wall of the heat dissipation sleeve 30 to form a stable support structure, so that when the heat dissipation sleeve 30 is subjected to an external force, it is not easily deformed such as dented.

[0085] Further, referring to the attached Figure 1 , 4 , 5, in some embodiments, the inside of the conversion tube 10 further includes a lining tube 70 and a lining heat insulation layer 80. The lining heat insulation layer 80 wraps the lining tube 70, and an outer heat insulation layer 90 is provided on the outer tube wall of a part of the conversion tube 10 to form a heat insulation pipe section 11.

[0086] Specifically, the structure of the conversion tube 10 includes a lining tube 70 disposed inside, and the lining tube 70 is extended to the gas collecting tube 20 and communicated with it. The lining tube 70 is used to pass high-temperature and high-pressure reactants, such as gases, liquids, etc.; the lining heat insulation layer 80 is wrapped outside the lining tube 70 to provide heat insulation protection for the high temperature of the conversion reaction. The lining heat insulation layer 80 is a refractory material such as high-temperature resistant low-silicon and low-iron castable or ceramic fiber prefabricated block. The lining heat insulation layer 80 provides structural rigidity and strength for the outer tube wall of the conversion tube 10.

[0087] Among them, the conversion tube 10 includes a heat insulation pipe section 11, and the heat insulation pipe section 11 is formed by providing an outer heat insulation layer 90 on the outer tube wall. The outer heat insulation layer 90 is made of low-thermal-conductivity ceramic fiber with a certain thickness. And a stop structure extending toward the side wall of the conversion tube 10 is provided at the first end of the heat dissipation sleeve 30 to prevent the outer heat insulation layer 90 from falling off. The outer heat insulation layer 90 provides heat insulation protection for the high temperature of the conversion reaction of the reactants in the heat insulation pipe section 11.

[0088] Further, referring to the attached Figure 1 , 4, 5. In some embodiments, the inner liner 70 includes a first inner liner 71 and a second inner liner 72. The first inner liner 71 is inserted into the second inner liner 72, and the second inner liner 72 extends into the gas collecting pipe 20.

[0089] Specifically, for the convenience of connecting and installing the inner liner 70 and the gas collecting pipe 20, the inner liner 70 inside the reforming tube 10 is divided into a first inner liner 71 and a second inner liner 72, and a partial pipe section of the first inner liner 71 is inserted into the second inner liner 72 in an interference fit manner, so that there is no gap at the connection of the inner liner 70, avoiding the overflow of high-flow reactants from the connection between the first inner liner 71 and the second inner liner 72 and causing production safety problems.

[0090] Embodiment Two

[0091] The present disclosure provides a reforming furnace, including the heat dissipation structure of the reforming tube 10 in Embodiment One, including the reforming tube 10, the gas collecting pipe 20, and the heat dissipation sleeve 30;

[0092] The reforming tube 10 includes a heat preservation pipe section 11 and a heat dissipation pipe section 12, and the gas collecting pipe 20 is communicated with the heat dissipation pipe section 12;

[0093] The heat dissipation sleeve 30 is arranged on the outer peripheral side of the heat dissipation pipe section 12. The first end of the heat dissipation sleeve 30 is connected to the heat preservation pipe section 11, the second end extends towards the gas collecting pipe 20, and there is a gap between the second end and the pipe wall of the gas collecting pipe 20;

[0094] Wherein, the heat dissipation sleeve 30 is arranged at an interval from the reforming tube 10, so that a heat dissipation cavity 40 is formed between the inner side wall of the heat dissipation sleeve and the outer side wall of the reforming tube 10. The heat dissipation cavity 40 surrounds the heat dissipation pipe section 12. A plurality of through holes 31 are circumferentially arranged on the pipe wall of the heat dissipation sleeve 30. The through holes 31 are communicated with the heat dissipation cavity 40, and the opening area of the circumferentially arranged through holes 31 gradually increases from the first end to the second end of the heat dissipation sleeve 30.

[0095] It should be noted that in the description of this specification, the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present disclosure; terms such as "connection", "installation", and "fixation" should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0096] In the description of this specification, the descriptions of the terms "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0097] As described above, it is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claimed rights.

Claims

1. A conversion tube heat dissipation structure, characterized in that, Comprising: A conversion tube, including a heat-insulating tube section and a heat-dissipating tube section; A gas collecting pipe, which is communicated with the heat-dissipating tube section; A heat-dissipating sleeve, which is arranged on the outer peripheral side of part of the heat-dissipating tube section. The first end of the heat-dissipating sleeve is connected to the heat-insulating tube section, the second end extends towards the gas collecting pipe, and there is a gap between the second end and the pipe wall of the gas collecting pipe; Wherein, the heat-dissipating sleeve is arranged at an interval from the conversion tube, so that a heat-dissipating cavity is formed between the inner side wall of the heat-dissipating sleeve and the outer side wall of the conversion tube. The heat-dissipating cavity is arranged around the heat-dissipating tube section. A plurality of through holes are circumferentially arranged on the pipe wall of the heat-dissipating sleeve. The through holes are communicated with the heat-dissipating cavity, and the opening area of the circumferentially arranged through holes gradually increases from the first end to the second end of the heat-dissipating sleeve.

2. The conversion tube heat dissipation structure according to claim 1, wherein, Further comprising: An air inlet, which is arranged at the second end of the heat-dissipating sleeve. The air inlet is an annular opening arranged around the conversion tube. The air inlet is communicated with the heat-dissipating cavity and is also communicated with the through holes arranged on the pipe wall of the heat-dissipating sleeve.

3. The conversion tube heat dissipation structure according to claim 2, characterized in that, Further comprising: A partition ring plate, which is an annular plate. At least one partition ring plate is arranged in the heat-dissipating cavity and divides the heat-dissipating cavity into at least two chambers. The partition ring plate has an inner ring end and an outer ring end; the inner ring end is fixedly arranged circumferentially with the outer wall of the conversion tube, and the outer ring end is fixedly arranged circumferentially with the inner wall of the heat-dissipating sleeve; And a plurality of ring plate holes are arranged on the end face of the partition ring plate, and the ring plate holes are used for communicating the chambers in the heat-dissipating cavity.

4. The conversion tube heat-dissipating structure according to claim 3, characterized in that There are two partition ring plates, and they are arranged at intervals in the heat-dissipating cavity, dividing the heat-dissipating cavity into three chambers. The opening area of the ring plate holes on the partition ring plate close to the air inlet is larger than the opening area of the ring plate holes on the other partition ring plate.

5. The conversion tube heat-dissipating structure according to claim 1, characterized in that The apertures of the through holes arranged on the pipe wall of the heat-dissipating sleeve are the same, then the opening density of the through holes close to the first end of the heat-dissipating sleeve is less than the opening density of the through holes close to the second end; or, The opening density of the through holes close to the first end of the heat-dissipating sleeve is equal to the opening density of the through holes close to the second end, and the aperture of the through holes close to the second end is larger than the aperture of the through holes close to the first end; or, Both the opening density and the aperture of the through holes close to the first end of the heat-dissipating sleeve are less than the opening density and the aperture of the through holes close to the second end of the heat-dissipating sleeve.

6. The conversion tube heat dissipation structure according to claim 3, characterized in that, Further comprising: Heat-dissipating support plates, a plurality of heat-dissipating support plates are circumferentially arranged on the outer peripheral side of the conversion tube, one end is arranged at the air inlet, and the other end extends into the heat-dissipating cavity along the length direction of the conversion tube.

7. The conversion tube heat-dissipating structure according to claim 6, characterized in that The heat dissipation support plate is fixedly arranged on the outer peripheral side of the conversion tube in an inclined manner on one side, extends towards the heat dissipation sleeve on the other side, and the other sides of two adjacent heat dissipation support plates are arranged close to each other in an inclined manner, so that the other sides of two adjacent heat dissipation support plates converge to form a vertex structure, and the vertex structure is used to abut against the inner wall of the heat dissipation sleeve.

8. The conversion tube heat dissipation structure according to claim 1, wherein The interior of the conversion tube further includes a lining tube and a lining heat insulation layer, the lining heat insulation layer wraps the lining tube, and an outer heat insulation layer is arranged on the outer side wall of a part of the conversion tube to form the heat insulation tube section.

9. The conversion tube heat dissipation structure according to claim 8, wherein The lining tube includes a first lining tube and a second lining tube, the first lining tube is inserted into the second lining tube, and the second lining tube extends into the gas collecting pipe.

10. A reformer, characterized in that, Comprising: The conversion tube heat dissipation structure according to any one of claims 1-9.

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