Heat carrier tube furnace

Abstract

The present application relates to the technical field of tubular heating furnace, and discloses a heat carrier tubular furnace, which comprises a heating chamber provided with an outlet and an inlet for heating the heat carrier in gas phase, a radiation chamber provided with an air inlet and an air outlet, the air inlet being communicated with the outlet through a pipeline, at least two air distribution cavities being arranged in the radiation chamber at intervals, the air distribution cavities being communicated with the air inlet, a group of radiation chamber coils being arranged between two adjacent air distribution cavities, and a plurality of air distribution ports being arranged on one side of the air distribution cavities close to the radiation chamber coils, and a circulating device for conveying the heat carrier and being communicated between the inlet and the air outlet through a pipeline. The heat carrier tubular furnace provided by the present application can effectively improve the uniformity of heating of each furnace tube, meets the actual production requirements of industry, and is especially suitable for large-scale tubular furnaces.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tubular heating furnace, in particular to a heat carrier tubular furnace. BACKGROUND

[0002] Tubular heating furnaces and tubular reaction furnaces are widely used in the oil refining and chemical industries. Currently, large tubular heating furnaces, tubular cracking furnaces, tubular conversion furnaces, etc. are mostly square box furnaces, and usually use fossil fuels as heat sources, which inevitably causes air pollution.

[0003] Patent CN 115823747 A proposes a scheme of using heat carriers as high-temperature heat sources to heat tubular furnaces, providing a feasible scheme for replacing fossil fuels. However, based on the traditional heat carrier heating furnace structure, it is mainly applied to low-temperature furnace conditions. The application of heat carriers to tubular furnaces with higher temperatures is not mature, especially when heating large tubular furnaces, it cannot guarantee the uniformity of heating of each furnace tube, making it difficult to meet the production needs of oil refining and chemical production, and there are difficulties in applying to large-scale devices. SUMMARY

[0004] The purpose of the present application is to address the problem that the traditional heat carrier heating furnace in the related art cannot be directly applied to tubular furnaces, cannot guarantee the uniformity of heating of each furnace tube, and cannot meet the production needs of oil refining and chemical production. The present application provides a heat carrier tubular furnace that can effectively improve the uniformity of heating of each furnace tube, meet the actual production needs of industry, and is especially suitable for large tubular furnaces.

[0005] To achieve the above purpose, the technical solution adopted by the present application is as follows:

[0006] A heat carrier tubular furnace, comprising: a heating chamber provided with an outlet and an inlet for heating a gas-phase heat carrier; a radiation chamber provided with an air inlet and an air outlet, the air inlet being connected to the outlet by a pipeline, at least two gas distribution cavities being spaced apart in the radiation chamber, the gas distribution cavities being connected to the air inlet, a group of radiation chamber coils being provided between adjacent two gas distribution cavities, and a plurality of shunt ports being provided on one side of the gas distribution cavities close to the radiation chamber coils; and a circulating device for transporting the heat carrier, connected between the inlet and the air outlet by a pipeline.

[0007] The heat carrier tubular furnace provided by the application adopts high-temperature gas phase heat carriers and combines the structural design of the radiation chamber, effectively improves the uniformity of heating of the radiation chamber coil, realizes continuous and uniform heating of the furnace pipe of the tubular furnace, further meets the requirements of high wall temperature, high heat flux and stable heating temperature of the furnace pipe of some cracking furnaces, conversion furnaces or heating furnaces in a refining device, and achieves the actual production requirements of industry. The high-temperature gas phase heat carrier can not only be recycled, but also has a wide heat source, which can be obtained by burning fossil fuels or using green clean energy as a heat source, thereby effectively reducing the emission of carbon dioxide and pollutants, and having a significant advantage in replacing the original large tubular furnace.

[0008] In some optional embodiments, the radiation chamber coil has the same spacing as the adjacent two sides of the gas distribution cavity.

[0009] In some optional embodiments, the volume of the gas distribution cavity between the adjacent two groups of radiation chamber coils is equivalent.

[0010] In some optional embodiments, the opening of the flow distribution port gradually increases along the flow direction of the heat carrier in the gas distribution cavity.

[0011] In some optional embodiments, the radiation chamber has a vertical structure, the top of the radiation chamber is provided with a plurality of branch flues, and the bottom of the radiation chamber is provided with a plurality of hot air flues. The plurality of branch flues are in communication with the gas outlet, and the plurality of hot air flues are in communication with the gas inlet.

[0012] In some optional embodiments, the plurality of branch flues correspond to the positions above the plurality of gas distribution cavities respectively, and the plurality of hot air flues correspond to the plurality of gas distribution cavities respectively.

[0013] In some optional embodiments, the gas distribution cavity adopts a high-temperature-resistant lining material, and the plurality of flow distribution ports are uniformly arranged in the transverse direction.

[0014] In some optional embodiments, the surface of the radiation chamber coil and the hot air flue are provided with a temperature measuring device.

[0015] In some optional embodiments, the circulation device comprises a convection chamber and a fan, and the convection chamber is provided with a convection chamber coil.

[0016] In some optional embodiments, each group of radiation chamber coils has a single-row structure or a double-row structure.

[0017] In some optional embodiments, the inner wall of the radiation chamber and the pipeline conveying the heat carrier are both provided with an insulation layer. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings described in the following embodiment are only some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on the drawings are within the scope of protection of the present application.

[0019] Figure 1 is a structural schematic diagram of the heat carrier tubular furnace described in the embodiment;

[0020] Figure 2 is a structural schematic diagram of the radiation chamber described in the embodiment;

[0021] Figure 3 is a structural schematic diagram of the large-scale design of the radiation chamber described in the embodiment;

[0022] Figure 4 is a structural schematic diagram of the shunt described in the embodiment Figure 1 ;

[0023] Figure 5 is a structural schematic diagram of the shunt described in the embodiment Figure 2 ;

[0024] Figure 6 is a structural schematic diagram of the multi-pass U-shaped combined furnace tube described in the embodiment;

[0025] Figure 7 is a structural schematic diagram of the two-in-one-out multi-pass combined furnace tube described in the embodiment;

[0026] Markings in the figure: 100-heat carrier tubular furnace, 110-heating chamber, 111-outlet, 112-inlet, 120-radiation chamber, 121-inlet, 122-outlet, 123-gas distribution cavity, 1231-shunt, 124-radiation chamber coil, 125-branch flue, 126-hot air flue, 130-circulation device, 131-convection chamber, 1311-convection chamber coil, 132-fan, 140-temperature measuring device, 150-pipe. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0028] The structure of the existing tubular heating furnace and tubular reaction furnace using fossil fuel as a heat source is mature, but as the requirement of environmental protection is getting higher and higher, it is urgent to find a cleaner heat source to replace fossil fuel, and using heated heat carrier as a heat source is a heating method that is gradually popularized and applied, but at present, the application of heat carrier heating furnace is difficult to ensure uniform heating of each furnace tube of the large-scale tubular furnace, in the related technology, the heating furnace using heat carrier has low heat carrier temperature and low furnace temperature, which cannot guarantee that the medium outlet temperature of each furnace tube reaches the production requirement of the petrochemical device, and there are difficulties in the development of large-scale device.

[0029] Low-carbon development requires changes in petrochemical technology and process design, and many fossil fuel-powered links in industrial processes will be replaced by electricity. In order to implement the national double carbon goal, using heat carriers to replace traditional fossil fuels in the heating process can greatly reduce carbon dioxide emissions. The heating furnace and cracking furnace in the refining and chemical industry are closely related to the process of the device, most of which are tubular heating furnaces. There is no mature technology for large high-temperature tubular heating furnaces at home and abroad. In order to apply heat carriers to large high-temperature tubular heating furnaces and effectively improve the uniformity of heating of each furnace tube to meet the actual production needs of industry, the present application provides a heat carrier tubular furnace.

[0030] The present application will be described below in conjunction with the accompanying drawings and specific embodiments:

[0031] Embodiment

[0032] As shown in Figure 1 and Figure 2 , a heat carrier tubular furnace 100 of the present application comprises: a heating chamber 110 provided with an outlet 111 and an inlet 112 for heating a gaseous heat carrier; a radiation chamber 120 provided with a gas inlet 121 and a gas outlet 122, the gas inlet 121 being communicated with the outlet 111 through a pipeline 150, at least two gas distribution cavities 123 being provided in the radiation chamber 120, the gas distribution cavities 123 being communicated with the gas inlet 121, a group of radiation chamber coils 124 being provided between adjacent two gas distribution cavities 123, and a plurality of distribution ports 1231 being provided on one side of the gas distribution cavities 123 close to the radiation chamber coils 124; and a circulating device 130 for conveying the heat carrier, which is communicated between the inlet 112 and the gas outlet 122 through the pipeline 150.

[0033] The radiation chamber coil 124 is the furnace tube that needs to be heated by the tubular furnace. After the hot carrier in the gas phase is heated to the set temperature in the heating chamber 110, it is output from the outlet 111, enters all the gas distribution cavities 123 through the gas inlet 121, and is uniformly distributed through the multiple distribution ports 1231. Each group of radiation chamber coils 124 is located between two adjacent gas distribution cavities 123, so that the distribution ports 1231 are distributed on both sides of each group of radiation chamber coils 124, so that the hot carrier sprayed from the distribution port 1231 can uniformly wrap the radiation chamber coil 124 for heating, thereby stably and uniformly heating the medium in the radiation chamber coil 124. The circulating device 130 provides power for conveying the hot carrier. After the hot carrier is discharged from the gas outlet 122, it will continue to be conveyed to the inlet 112, and then be reheated in the heating chamber 110 for recycling.

[0034] The hot carrier tubular furnace 100 provided by the application uses high-temperature gas-phase hot carriers and combines the structural design of the radiation chamber 120, effectively improving the uniformity of heating the radiation chamber coil 124, achieving continuous and uniform heating of the furnace tube of the tubular furnace, thereby meeting the requirements of high-wall-temperature high-heat-flux and stable heating temperature for some cracking furnaces, conversion furnaces or heating furnaces in the refining device, and achieving the actual production needs of industry. The high-temperature gas-phase hot carrier can not only be recycled, but also has a wide heat source, which can be obtained by burning fossil fuels or using green clean energy as a heat source, thereby effectively reducing the emission of carbon dioxide and pollutants, and having significant advantages in replacing the original large tubular furnace.

[0035] In some optional embodiments, as shown in Figure 2 The distance between the radiation chamber coil 124 and the adjacent two gas distribution cavities 123 is the same; each group of radiation chamber coils 124 has corresponding gas distribution cavities 123 on both sides, and the distance between the radiation chamber coil 124 and the corresponding gas distribution cavities 123 on both sides is controlled to be approximately equal, which can effectively improve the uniformity of the hot carrier wrapping the radiation chamber coil 124, that is, the hot carriers on both sides of the radiation chamber coil 124 need to pass through the same distance to contact the tube wall of the radiation chamber coil 124 after being sprayed from the multiple distribution ports 1231 of the gas distribution cavity 123. When the hot carriers in each gas distribution cavity 123 have the same flow rate, the uniformity of heating the radiation chamber coil 124 can be effectively improved. If multiple groups of radiation chamber coils 124 are arranged in the radiation chamber 120, it is also convenient to uniformly control the flow rate of all hot carriers, which can effectively adjust the heating power of each group of radiation chamber coils 124, reduce the control variables, and make it easier to control the heating of the furnace tube.

[0036] In some alternative embodiments, the volumes of the air distribution cavities 123 between two adjacent groups of the radiation chamber coils 124 are equivalent; when there are at least two groups of the radiation chamber coils 124, there are at least three air distribution cavities 123, the air distribution cavities 123 located at the sides of the radiation chamber 120, only one side of which is provided with a plurality of distribution ports 1231, because only one group of the radiation chamber coils 124 needs to be supplied with the heat carrier; the air distribution cavities 123 located between two groups of the radiation chamber coils 124, both sides of which are provided with a plurality of distribution ports 1231, because both sides of the radiation chamber coils 124 need to be supplied with the heat carrier.

[0037] When there are only two air distribution cavities 123 located at the sides of the radiation chamber 120, the air distribution cavities 123 located between two groups of the radiation chamber coils 124 can be provided with a plurality of air distribution cavities 123 according to the size of the radiation chamber 120, i.e., the radiation chamber 120 is provided with a plurality of groups of the radiation chamber coils 124, the air distribution cavities 123 located between two groups of the radiation chamber coils 124 are designed to have a reasonable volume to accommodate the heat carrier and a uniform size, so that the plurality of air distribution cavities 123 located between two groups of the radiation chamber coils 124 have approximately the same volume, and in combination with the control of the same distance between the radiation chamber coils 124 and the adjacent air distribution cavities 123, the entire radiation chamber 120 can form a structure with high symmetry, thereby facilitating the large-scale and scaled application of the device, and also facilitating the segmented assembly construction, such as Figure 3 As shown in FIG. 8, it is a schematic diagram of the improved structure of the large-scale radiation chamber 120, i.e., the symmetrical structure is easy to arrange and increase a plurality of groups of the radiation chamber coils 124, thereby simplifying the structure design of the large-scale radiation chamber 120, the two air distribution cavities 123 located at the sides of the radiation chamber 120 have less influence on the large-scale application, and the volumes of the two air distribution cavities 123 can be controlled to be equivalent, and the volumes of the air distribution cavities 123 located between two groups of the radiation chamber coils 124 are exactly 1 / 2, thereby ensuring the heat supply effect of the air distribution cavities 123 and the symmetry of the entire radiation chamber 120.

[0038] In some alternative embodiments, the opening of the distribution port 1231 gradually increases along the flow direction of the heat carrier in the air distribution cavity 123; the distribution of the distribution port 1231 and the flow direction of the heat carrier are mainly designed according to the required temperature field in the radiation chamber 120, such as Figure 4As shown, the side of the gas distribution cavity 123 is provided with a plurality of flow distribution ports 1231. According to the specific working conditions of the temperature field of the radiation chamber 120, the opening size and arrangement mode of the flow distribution ports 1231 can be flexibly selected. For example, the plurality of flow distribution ports 1231 can be selected to have the same size and be uniformly distributed on the side of the gas distribution cavity 123. According to the flow direction of the heat carrier, the structure of the flow distribution ports 1231 can be further optimized to improve the uniformity of the heat carrier sprayed from the entire side of the gas distribution cavity 123. This is particularly obvious in the vertical structure of the gas distribution cavity 123. That is, when the heat carrier enters from the bottom of the gas distribution cavity 123 and flows upward in the gas distribution cavity 123, it is sprayed from the left and / or right flow distribution ports 1231. Since the power source for conveying the heat carrier is outside the radiation chamber 120, the flow rate of the heat carrier in the gas distribution cavity 123 gradually decreases, as shown. Figure 5 Therefore, the structure of the flow distribution ports 1231 can be further optimized. The opening of the flow distribution ports 1231 can be designed to gradually increase along the flow direction of the heat carrier. This can effectively balance the flow rate loss of the heat carrier, so that the amount of heat carrier sprayed at each flow distribution port 1231 can be approximately the same. This can achieve more uniform distribution of the heat carrier sprayed from the entire side of the gas distribution cavity 123, thereby further improving the uniformity of heating the furnace tube.

[0039] In some optional embodiments, the radiation chamber 120 has a vertical structure. The top of the radiation chamber 120 is provided with a plurality of branch flues 125, and the bottom of the radiation chamber 120 is provided with a plurality of hot air flues 126. The plurality of branch flues 125 are in communication with the gas outlet 122, and the plurality of hot air flues 126 are in communication with the gas inlet 121.

[0040] The length of the radiation chamber coil 124 is generally long. The radiation chamber 120 can be selected to have a vertical structure, which can effectively reduce the floor area and facilitate the upward flow of the heat carrier. The gas inlet 121 is correspondingly located at the bottom of the radiation chamber 120, and a plurality of hot air flues 126 are provided between the gas inlet 121 and the gas distribution cavity 123. Since the plurality of gas distribution cavities 123 of the radiation chamber 120 have a certain spacing, and the overall space structure of the radiation chamber 120 is generally large, the plurality of hot air flues 126 facilitate the diversion and transportation of the heat carrier, thereby improving the transmission efficiency of the heat carrier. The gas outlet 122 is correspondingly located at the top of the radiation chamber 120. The plurality of branch flues 125 provided at the top of the radiation chamber 120 are used to collect the heat carrier sprayed from each gas distribution cavity 123, thereby facilitating the rapid flow and collection of the heat carrier to the gas outlet 122 for discharge.

[0041] In some optional embodiments, the plurality of branch flues 125 are respectively located above the plurality of gas distribution cavities 123, and the plurality of hot air flues 126 are respectively in communication with the plurality of gas distribution cavities 123.

[0042] The heat carrier output by each hot air duct 126 can correspond to multiple gas distribution cavities 123. If the number of hot air ducts 126 is designed to be consistent with the number of gas distribution cavities 123 and is in one-to-one correspondence, the heat carrier flow of each gas distribution cavity 123 can be finely controlled, and the effect of uniform distribution of heat carriers by the hot air duct 126 can be further improved. Each branch flue 125 can also be located directly above the radiation chamber coil 124 or other positions. If each branch flue 125 is designed to correspond to a position directly above one gas distribution cavity 123, a good path can be formed to improve the heat exchange efficiency, that is, the heat carrier can smoothly rise to the branch flue 125 after being sprayed at the distribution port 1231, and the U-shaped flow path formed ensures that the flow of the heat carrier is not too fast, thereby ensuring sufficient heat exchange with the radiation chamber coil 124.

[0043] In some optional embodiments, the gas distribution cavity 123 is made of a high-temperature-resistant lining material, and the multiple distribution ports 1231 are uniformly arranged in the transverse direction. Since large tubular heating furnaces have high requirements for heating temperature, usually reaching thousands of degrees Celsius, the gas distribution cavity 123 is also designed as a vertical structure, which facilitates the use of high-temperature-resistant lining materials such as ceramic fiber products, castable or high-aluminum bricks, corundum bricks, and other high-temperature-resistant and erosion-resistant materials. The construction cost is effectively controlled while meeting production requirements. The height of the gas distribution cavity 123 can be selected to be equivalent to the indoor height of the radiation chamber 120, that is, the top and bottom of the gas distribution cavity 123 abut against the inner wall of the radiation chamber 120, thereby enabling the radiation chamber coil 124 to be heated over a large area. The height of the gas distribution cavity 123 can also be selected to correspond to only one section of the radiation chamber coil 124. The height of the gas distribution cavity 123 is mainly determined according to the specific working conditions and the structural strength.

[0044] The opening shape of the distribution port 1231 can be square, rectangular, circular, or other irregular shapes. If the gas distribution cavity 123 is formed by stacking brick-shaped materials such as corundum bricks, the distribution port 1231 can be formed directly by the bricklaying process when the gas distribution cavity 123 is stacked, that is, some bricks are selectively extracted to form a through-hole structure. Therefore, the distribution port 1231 can be a rectangular through-hole uniformly spaced in the transverse direction and staggered in the vertical direction, which can not only ensure the uniform spraying of heat carriers on the entire wall surface but also effectively ensure the structural stability of the entire brick wall. The number and specific opening size of the distribution port 1231 can be determined according to the heat demand of the radiation chamber coil 124, the flow of the heat carrier, and the thermal load of the heating chamber 110.

[0045] In some optional embodiments, the circulating device 130 comprises a convection chamber 131 and a fan 132, and the convection chamber 131 is provided with a convection chamber coil 1311; the circulating device 130 can be installed with the fan 132 in the pipeline 150 between the air outlet 122 and the inlet 112, and the fan 132 can increase the pressure of the heat carrier, thereby serving as a power source to push the heat carrier to circulate, and the circulating device 130 can also be provided with the convection chamber 131, and the convection chamber 131 is provided with the convection chamber coil 1311 for heat exchange, which can realize cooling of the heat carrier, and the pipe diameter, length and pipe row number of the convection chamber coil 1311 can be determined according to the medium flow and temperature, the convection chamber coil 1311 can be arranged in a shell-and-tube type, and a light pipe or an expanded surface pipe can be selected, and the material of the convection chamber coil 1311 can be selected from austenitic stainless steel, low alloy steel or carbon steel.

[0046] Since the required temperature in the radiation chamber 120 is very high, the heat carrier has a high temperature even after heat exchange with the radiation chamber coil 124, and accordingly, the pipeline 150 for transporting the heat carrier needs to have high heat resistance, which leads to a sharp increase in the laying cost of the pipeline 150, which is very unfavorable for long-distance circulation transportation, and therefore, the convection chamber 131 can be located close to the air outlet 122, so that the heat carrier discharged from the radiation chamber 120 can be cooled in time, and then the convection chamber 131 and the heating chamber 110 can be selected to be connected by a conventional pipeline 150 for transportation, which can effectively control the equipment cost, and is especially beneficial for long-distance transportation in a factory, and meanwhile, the liquid in the convection chamber coil 1311 can also be used for heating or providing hot water after heat exchange with the heat carrier, which ensures full utilization of heat and improves economic benefits.

[0047] In some optional embodiments, each set of radiation chamber coil 124 is in a single-row structure or a double-row structure; one set of radiation chamber coil 124 can be one or more furnace tube bending coil, can be in a multi-row multi-column overlapping structure, or in a single-row multi-column single-row structure, which means that in the interval direction of the plurality of gas distribution cavities 123, there is only one row of radiation chamber coil 124 between the adjacent two gas distribution cavities 123, that is, in the vertical radiation chamber 120, the gas distribution cavities 123 are vertically arranged along the Y direction and are spaced apart along the X direction, each gas distribution cavity 123 has a certain width along the Z direction, and between the adjacent two gas distribution cavities 123, each set of radiation chamber coil 124 is in a single-row structure along the Y direction and is bent and combined along the Z direction, and from the X direction, each set of radiation chamber coil 124 has only the thickness of one furnace tube, and each set of radiation chamber coil 124 can be one furnace tube bending forming or a plurality of furnace tube arrangement combination, that is, the single-row radiation chamber coil 124 does not overlap and combine in the X direction, but can be bent and arranged in combination in the Z direction according to the specific working conditions, thereby forming different widths, the single-row radiation chamber coil 124 can not only provide sufficient heat exchange area, but also ensure that each furnace tube has the same working condition of contacting the heat carrier, thereby further improving the uniformity of the furnace tube heating, and the double-row radiation chamber coil 124, that is, in the interval direction of the plurality of gas distribution cavities 123, the radiation chamber coil 124 between the adjacent two gas distribution cavities 123 is provided with two rows, which ensures that the distance between the two rows of radiation chamber coil 124 and the adjacent gas distribution cavity 123 is the same, and can also better ensure the uniformity of the furnace tube heating.

[0048] The radiation chamber coil 124 can be selected as a vertical pipe or a horizontal pipe according to the structure of the radiation chamber 120, and the structure of each furnace tube can also be selected according to the needs, for example, a double-pass U-shaped furnace tube is used, as shown in Figure 6 and Figure 7 , a multi-pass U-shaped combined furnace tube or a two-in-one-out multi-pass combined furnace tube can also be selected, the material of the radiation chamber coil 124 can be austenitic stainless steel or high-temperature nickel-based alloy, and the pipe diameter and length of the radiation chamber coil 124 can be determined according to the medium flow temperature and resistance drop.

[0049] In some optional embodiments, the surface of the radiation chamber coil 124 and the hot air duct 126 are provided with temperature measuring devices 140. The temperature measuring devices 140 can be temperature thermocouples, which are installed on the wall of the radiation chamber coil 124 to monitor the temperature of the outer surface of the radiation chamber coil 124, installed in the hot air duct 126 or the tobacco conveying duct 125 to monitor the temperature of the heat carrier, or inserted thermocouples, which are installed on the inner surface of the radiation chamber coil 124 to monitor the temperature of the medium in the coil. Further, according to the temperature values obtained at different positions, the temperature and flow rate of the heat carrier entering the hot air duct 126 and the flow rate of the heating medium can be adjusted in real time, so as to accurately control the temperature of the medium in the radiation chamber coil 124.

[0050] In some optional embodiments, the inner wall of the radiation chamber 120 and the pipeline 150 conveying the heat carrier are provided with thermal insulation layers. The thermal insulation layers can be wrapped on the outside by providing thermal insulation linings or selecting thermal insulation materials, and different refractory materials and thicknesses can be selected according to the temperature. The thermal insulation layers can effectively reduce the heat loss in the radiation chamber 120 and the pipeline 150, thereby improving the heat exchange efficiency of the entire device.

[0051] Based on the convenience of production and processing and the needs of specific working conditions, certain combinations are made in various optional embodiments, such as shown in Figure 1 and Figure 2 Specifically, the heat carrier tubular furnace 100 comprises a heating chamber 110, a radiation chamber 120, a convection chamber 131 and a fan 132 which are sequentially connected by a pipeline 150.

[0052] The heating chamber 110 stores gaseous heat carriers, which can be one or a combination of nitrogen, carbon dioxide and inert gases, and the temperature of the heat carriers can reach 80-2000°C. The heat carriers are used in a closed cycle, so as to solve the problems of carbon emission and pollutant emission of the tubular furnace. The outlet 111 of the heating chamber 110 is connected to the gas inlet 121 of the radiation chamber 120.

[0053] The radiation chamber 120 adopts a vertical structure and can be formed by stacking corundum bricks. Three gas distribution chambers 123 and two groups of radiation chamber coils 124 are arranged in the radiation chamber 120. The gas distribution chambers 123 are also formed by stacking corundum bricks, and the height of the gas distribution chambers 123 is about 4 / 5 of the height of the radiation chamber coils 124. The gas distribution chambers 123 are arranged near the wall of the radiation chamber 124, and the through holes formed by extracting the bricks are used as the distribution ports 1231. The radiation chamber coils 124 are vertical furnace pipes, and the two groups of radiation chamber coils 124 are both single-row structures. One group of radiation chamber coils 124 comprises a multi-pass U-shaped combined furnace pipe and a double-pass U-shaped furnace pipe arranged side by side, and the other group of radiation chamber coils 124 comprises a two-in-one-out multi-pass combined furnace pipe and a double-pass U-shaped furnace pipe arranged side by side.

[0054] The radiation chamber coil 124 is equidistant from the two adjacent air distribution chambers 123, and only one side of the air distribution chamber 123 on both sides of the radiation chamber 120 is provided with a plurality of distribution ports 1231. The middle air distribution chamber 123 has a distribution port 1231 on both sides because there is a radiation chamber coil 124 on both sides. The volume of the middle air distribution chamber 123 is exactly twice the volume of the two side air distribution chambers 123 of the radiation chamber 120, thereby ensuring that the heat carriers on both sides of each group of radiation chamber coils 124 are more uniform. The plurality of distribution ports 1231 are uniformly spaced horizontally and vertically staggered on the side of the air distribution chamber 123, and the opening size of the distribution port 1231 gradually increases from the bottom to the top of the air distribution chamber 123.

[0055] Three hot air ducts 126 are provided at the bottom of the radiation chamber 120, and the three hot air ducts 126 are respectively connected to the bottom of the three air distribution chambers 123. According to the air intake and volume of the three air distribution chambers 123, the opening size of the middle hot air duct 126 is twice that of the two side hot air ducts 126. The three hot air ducts 126 are simultaneously connected to the air inlet 121 of the radiation chamber 120. Three smoke ducts 125 are provided at the top of the radiation chamber 120, and the three smoke ducts 125 are vertically corresponding to the top of the three air distribution chambers 123. According to the exhaust capacity of the three air distribution chambers 123, the opening size of the middle smoke duct 125 is twice that of the two side smoke ducts 125. The three smoke ducts 125 finally converge and are connected to the air outlet 122 of the radiation chamber 120. The air outlet 122 of the radiation chamber 120 is connected to the convection chamber 131.

[0056] The convection chamber 131 is provided with a convection chamber coil 1311 arranged in a column tube type. The inner wall of the radiation chamber 120 is provided with a heat preservation layer. The pipeline 150 connecting the radiation chamber 120, the convection chamber 131, and the heating chamber 110 is also provided with a heat preservation lining. The surface of the radiation chamber coil 124, the hot air duct 126, and the smoke duct 125 are all provided with a temperature measuring device 140.

[0057] In use, a specific flow of heat carrier is filled in the heating chamber 110, heated to a set temperature by a heat source, and then discharged through the outlet 111. The heat source of the heating chamber 110 can be combustion of fossil fuels, electric heating, or use of other green energy sources. If green energy sources are used, carbon dioxide emissions can be greatly reduced. After heating, the heat carrier is divided into three hot air ducts 126 through the air inlet 121. The flow of the heat carrier is determined according to the opening size of the hot air duct 126. The high-temperature heat carrier flows into the air distribution chamber 123 and is sprayed towards the radiation chamber coil 124 through multiple distribution ports 1231. The radiation chamber coil 124 is uniformly wrapped on both sides by the heat carrier, which can uniformly heat the medium in the radiation chamber coil 124. After releasing heat, the high-temperature heat carrier is reduced in temperature, collected through the three branch flues 125 at the top, and then discharged through the air outlet 122 and transported into the convection chamber 131 for cooling. After heat exchange through multiple groups of convection chamber coils 1311, the temperature of the heat carrier is reduced to the designed value. After being pressurized by the fan 132, the heat carrier reenters the heating chamber 110 through the inlet 112, is heated by the heat source to the predetermined temperature, and starts to circulate again.

[0058] The heat carrier tube furnace 100 provided by the application can be designed into multiple powers according to specific working conditions, and multiple furnace tube arrangement forms can be selected. The heat carrier tube furnace 100 can replace most of the conventional tube furnaces in existing refining devices. The structural design of the hot air duct 126 and the air distribution chamber 123 can ensure that the heat carrier enters the radiation chamber 120 according to the heat demand and exchanges heat with the radiation chamber coil 124. By adjusting the opening arrangement of the distribution port 1231, the furnace temperature field can be controlled according to the furnace tube structure and the heat demand of each part, which can better meet the demand of the heat absorption reaction in the furnace tube and ensure that the outlet temperature of the medium in each group of radiation chamber coils 124 remains uniform.

[0059] The symmetrical structural design of the radiation chamber 120 can increase the number of radiation chamber coils 124 and air ducts in the length or width direction, which can meet the requirements of large-scale heat carrier tube cracking furnaces and heating furnaces. The inert gas used as the heat carrier can protect the furnace tube from oxidation at high temperatures, and the long service life of the furnace tube. At the same time, the recycling of the heat carrier can improve the thermal efficiency of the tube furnace and solve the problem of pollutant emission of the tube furnace.

[0060] The overall structural design of the radiation chamber 120 realizes continuous and uniform heating of the furnace tube of the tube furnace, which can meet the requirements of high wall temperature, high heat flux, and stable heating temperature of some furnace tubes in refining devices such as cracking furnaces, conversion furnaces, or heating furnaces. It meets the actual production needs of industry and has broad market prospects. It can be used for new petroleum chemical plants and energy-saving modification of existing devices.

[0061] It should be noted that all directionality indications in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture, and if the specific posture changes, the directionality indications also change accordingly.

[0062] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements, or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] In addition, the description such as "first", "second", etc. in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features, or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0064] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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 application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

Claims

1. A heat carrier tubular furnace, characterized in that, include: The heating chamber (110) is provided with an outlet (111) and an inlet (112) for heating the gaseous heat carrier; A radiation chamber (120) is provided with an air inlet (121) and an air outlet (122). The air inlet (121) is connected to the outlet (111) via a pipe (150). At least two air distribution chambers (123) are provided at intervals within the radiation chamber (120). The air distribution chambers (123) are connected to the air inlet (121). A set of radiation chamber coils (124) is provided between two adjacent air distribution chambers (123). Multiple flow outlets (1231) are provided on the side of the air distribution chamber (123) near the radiation chamber coils (124). A circulation device (130) for conveying the heat carrier is connected between the inlet (112) and the outlet (122) via a pipe (150).

2. The heat carrier tubular furnace according to claim 1, characterized in that, The distance between the radiation chamber coil (124) and the adjacent two side air distribution chambers (123) is the same.

3. The heat carrier tubular furnace according to claim 2, characterized in that, The gas distribution chambers (123) between two adjacent sets of radiation chamber coils (124) have the same volume.

4. The heat carrier tubular furnace according to claim 1, characterized in that, Along the flow direction of the heat carrier in the gas distribution chamber (123), the opening of the diversion port (1231) gradually increases.

5. The heat carrier tubular furnace according to claim 1, characterized in that, The radiation chamber (120) is a vertical structure. The top of the radiation chamber (120) is provided with multiple branch flues (125), and the bottom of the radiation chamber (120) is provided with multiple hot air ducts (126). The multiple branch flues (125) are connected to the air outlet (122), and the multiple hot air ducts (126) are connected to the air inlet (121).

6. The heat carrier tubular furnace according to claim 5, characterized in that, The multiple branch flues (125) are respectively located above the multiple gas distribution chambers (123), and the multiple hot air ducts (126) are respectively connected to the multiple gas distribution chambers (123).

7. The heat carrier tubular furnace according to claim 5, characterized in that, The gas distribution chamber (123) is lined with a high-temperature resistant material, and the multiple distribution ports (1231) are evenly spaced in the transverse direction.

8. The heat carrier tubular furnace according to claim 5, characterized in that, Temperature measuring devices (140) are installed on the surface of the radiant chamber coil (124) and the hot air duct (126).

9. The heat carrier tubular furnace according to any one of claims 1 to 8, characterized in that, The circulation device (130) includes a convection chamber (131) and a fan (132), and the convection chamber (131) is provided with a convection chamber coil (1311).

10. The heat carrier tubular furnace according to claim 1, characterized in that, Each group of radiation chamber coils (124) is a single-row or double-row structure.

Images