Heat treatment device

Abstract

The utility model relates to a heat treatment device which comprises a furnace body, a circulating pipeline, a heating system and a dust removal component, a gas medium circularly flows through the circulating pipeline, and the temperature of each part of the component is uniformly distributed in the heat treatment process, so that the heat treatment at the same temperature can be carried out on each part of the component. The influence of thermal stress difference between different positions is avoided, pollutants such as dust and particles in a gas medium are removed through the dust removal component, the pollutants such as the dust can be prevented from being accumulated in the system, dust removal gas is introduced into the component with the internal gas channel, and the dust removal effect is improved. Uniform heat treatment is ensured, and meanwhile the cleanliness of the interior of a component is improved.

Description

[Technical field]

[0002] The utility model belongs to the technical field of heat treatment, and in particular relates to a heat treatment device. [Background technology]

[0004] Fixed tube sheet heat exchangers are being widely used in basic chemical industries, such as coal-to-methanol, coal-to-olefins, coal-to-butanol, coal-to-octanol, petroleum refining, petroleum cracking, ethylene cracking, organic silicon, polysilicon, pharmaceuticals, fine chemicals, and photovoltaics, due to their simple structure and the smallest inner diameter under the same heat transfer area. In particular, when manufacturing low-temperature steel heat exchangers, chrome-molybdenum steel heat exchangers, and high-strength steel heat exchangers, the traditional manufacturing process can only be completed through local heat treatment, but this process has limitations and will produce effects such as excessive residual stress and incomplete heat treatment. These factors will cause safety hazards and shortened service life of the equipment during operation.

[0005] With the progress of society, various devices are developing towards large-scale, especially low-temperature steel heat exchangers, chromium-molybdenum steel heat exchangers and high-strength steel heat exchangers. These types of heat exchangers have a wide range of applications and have broad market prospects.

[0006] However, when traditional manufacturing processes encounter these types of heat exchangers, they can only perform local heat treatment. This is because when performing the overall heat treatment process, if the cylinder diameter is large and the length of the cylinder is long, during the overall heat treatment process, the cylinder is subjected to convection heat transfer between the high-temperature flue gas flowing through the cylinder surface and the cylinder surface, as well as radiation heat transfer between the burner and the cylinder through electromagnetic waves, and the cylinder heats up rapidly. The heat exchange tube is only subjected to heat conduction at the tube head connected to the tube sheet, and the overall temperature rises slowly, and the cylinder and the heat exchange tube are heated unevenly. Therefore, axial forces in opposite directions will be generated at the tube sheet and the heat exchange tube head. When the shell stiffness is small, the shell will produce a bulge like an expansion joint; conversely, when the shell stiffness is large, the tube head of the heat exchange tube will be torn by the axial force.

[0007] Therefore, how to adopt an overall heat treatment process for this type of heat exchanger has always been a concern in this field. [Summary of the invention]

[0009] The purpose of the utility model is to provide a heat treatment device, which can make the same heat treatment process be performed on each part of the component during the heat treatment process, and ensure the cleanliness of the heat treatment device and the inside of the treatment component through the dust removal component. The purpose of the utility model is achieved through the following technical scheme: The utility model provides a heat treatment device, including a furnace body, a circulation pipeline and a heating system, the furnace body is used to place the component to be heat treated, and the component to be heat treated is heat treated in the furnace body, the two ends of the circulation pipeline are connected to the furnace body and include an exhaust component, so that the gas medium in the furnace body flows out of the furnace body at one end of the circulation pipeline through the other end into the furnace body so that the gas medium circulates, and the heating system is used to heat the gas medium in the furnace body.

[0010] In one of the embodiments, a dust removal component is further included, wherein the dust removal component is arranged on the circulation pipeline and is used to remove dust in the gas medium.

[0011] In one embodiment, the furnace body further includes a gas connecting pipe, one end of which is connected to one end of the circulation pipe where the gas medium flows into the furnace body, for guiding the gas medium flowing into the furnace body through the circulation pipe to a target position.

[0012] In one of the embodiments, the component to be heat treated comprises a gas channel, and the other end of the gas connecting pipe is connected to the gas channel of the component to be heat treated.

[0013] In one embodiment, the number of the circulation pipes is at least two.

[0014] In one of the embodiments, it also includes a gas supply system, which includes a heat exchanger. The heat exchanger includes a gas outlet pipe connected to the furnace body and leading out the gas medium. The gas medium led out of the furnace body heats the supplied gas in the heat exchanger, and the heated gas flows to the heating system.

[0015] In one of the embodiments, the pipeline for leading the gas medium out of the heat exchanger also includes a dust removal component.

[0016] In one of the embodiments, the dust removal component includes a U-shaped bend pipe, through which the gas medium in the pipe is inertially dusted.

[0017] In one of the embodiments, it further includes thermocouples, wherein there are at least two thermocouples disposed on the component to be heat treated.

[0018] In one embodiment, the thermocouple includes an anchoring component, and the anchoring component includes a tube with a diameter smaller than an inner diameter of the gas channel.

[0019] In one embodiment, the thermocouples are evenly and symmetrically distributed on the component to be heat treated.

[0020] In one of the embodiments, the end of the circulation pipe leading out the gas medium from the furnace body is arranged at the top of the furnace body.

[0021] In one embodiment, it further includes a control system, which is connected to the heating system, the thermocouple and the exhaust component, and controls the power of the heating system and / or the exhaust component according to the measurement result of the thermocouple.

[0022] In one of the embodiments, the circulation pipeline further includes an auxiliary heating device, and the auxiliary heating device is used to heat the gas medium in the circulation pipeline.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] 1. The utility model improves the heat treatment equipment architecture, which can ensure the uniformity of temperature, so that each part of the large equipment can be operated under the same conditions in the overall heat treatment process, avoiding the influence of thermal stress differences between different positions;

[0025] 2. The dust removal components are added to the equipment, which can remove dust, particles and other pollutants in the gas medium, prevent the accumulation of dust and other pollutants in the system, and improve the quality of the product;

[0026] 3. On the basis of overall heat treatment, the utility model optimizes the flow direction of gas in the components with internal gas channels, and cooperates with dust removal components to ensure the cleanliness of the components while performing uniform heat treatment;

[0027] 4. In addition, the utility model further improves the thermocouple measurement structure, which can improve the accuracy of thermocouple temperature measurement, and reuse the waste heat of the gas entering the furnace body through the heat exchanger, thereby reducing fuel consumption and reducing the cost of equipment use.

Brief Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of a heat treatment device in one embodiment of the utility model.

[0030] Figure 2 It is a structural schematic diagram of a heat treatment device in another embodiment of the utility model.

[0031] Figure 3 It is a structural schematic diagram of the temperature measuring end of the thermocouple in the utility model.

[0032] Figure 4 It is a schematic diagram of the arrangement position of the thermocouple of the utility model in a side view.

[0033] Figure 5 It is a schematic diagram of the arrangement position of the thermocouple of the utility model on the cross section. [Specific implementation method]

[0035] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. It is understandable that the specific embodiments described herein are only used to explain the utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model rather than all structures are shown in the accompanying drawings. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0036] The terms "include" and "have" and any variations thereof in the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] See also Figure 1 , Figure 2 , Figure 1 This is a schematic diagram of the structure of a heat treatment device in one embodiment of the utility model. Figure 2It is a structural schematic diagram of a heat treatment device in another embodiment of the utility model. The heat treatment device of the utility model is suitable for overall heat treatment of large-sized components or devices. The heat treatment effect is ensured by placing each part at the same temperature. At the same time, the heat treatment device and the cleanliness of the inside of the treatment component are improved by combining the dust removal component 400. The heat treatment device of the utility model includes a furnace body 100, a circulation pipeline 200, a heating system 300 and a dust removal component 400. The furnace body 100 is used to place a component 500 to be heat-treated, and the component 500 to be heat-treated is heat-treated in the furnace body 100. The two ends of the circulation pipeline 200 are connected to the furnace body 100 and include an exhaust component, so that the gas medium in the furnace body 100 flows out of the furnace body 100 at one end of the circulation pipeline 200 and flows into the furnace body 100 through the other end, so that the gas medium circulates. The heating system 300 is used to heat the gas medium in the furnace body 100. The dust removal component 400 is arranged on the circulation pipeline 200 to remove dust in the gas medium.

[0039] A dust removal device is arranged in the circulation duct 200 to remove pollutants such as dust and particles in the high-temperature flue gas (gas medium) led out from the furnace body 100. The lead-out part of the circulation duct 200 can be arranged at the upper end of the furnace body 100. A device for circulating the gas, such as a high-temperature duct induced draft fan 210 and a high-temperature blower 220, can be arranged in the circulation duct 200. The position where the gas of the circulation duct 200 enters the furnace body 100 can be set on the side. Of course, the specific positions of the lead-out and the introduction can be selected according to needs, and the utility model does not impose specific restrictions.

[0040] The utility model is provided with a circulation pipeline 200, so that the gas medium circulates in the furnace body 100, and the temperature distribution of the gas medium is uniform by enhancing the gas flow. The temperature of the components to be processed is uniform through the above method, and the adverse effects caused by different temperatures on different parts can be avoided. For example, the tube sheet and the tube head generate axial forces in opposite directions. When the rigidity of the shell is small, the shell will produce a bulge like an expansion joint; on the contrary, when the rigidity of the shell is large, the tube head will be torn by the axial force. In this process, a dust removal device is further added to remove dust and other impurities in the gas medium during the circulation of the gas medium, thereby avoiding the accumulation of dust and other impurities in the device and the processing components.

[0041] Specifically, the furnace body 100 further includes a gas connection pipe 110, one end of which is connected to one end of the circulation pipe 200 into which the gas medium flows, and is used to guide the gas medium flowing into the furnace body 100 from the circulation pipe 200 to a target position. The gas connection pipe 110 in the furnace body 100 can be integrated with the circulation pipe 200, or can be separately provided. Preferably, the internal gas connection pipe 110 is independently provided, and can be replaced according to different components to be processed, and can also connect multiple parts through a multi-channel structure. The specific form of the pipe can use a bellows.

[0042] Specifically, the component to be heat treated 500 includes a gas channel, and the other end of the gas connecting pipe 110 is connected to the gas channel of the component to be heat treated 500. It is a common mechanical structure configuration to set a gas channel in the component to be heat treated 500. For example, in a large heat exchanger 610, the heat exchanger 610 has different channels. The manufacture of the heat exchanger 610 requires the assembly of different parts, and residual thermal stress will be generated during the manufacturing process. These factors will cause safety hazards during the operation of the equipment and shorten the service life. When the heat exchanger 610 is heat-treated, the cylinder and the heat exchange tube will be heated unevenly due to heat conduction. When the heat treatment device of the utility model is processing, the circulation pipe 200 is connected to the gas channel in the component, so that the gas medium flows and circulates in the furnace body 100 and the component, so that the temperature difference between the inside and outside of the heat exchanger 610 is reduced, and the uneven heating of different parts of the heat exchanger 610 is reduced.

[0043] For example, the high-temperature blower 220 in the circulation duct 200 blows the high-temperature flue gas after dust removal into the gas channel in the heat exchanger 610. At this time, the high-temperature flue gas serves as a heat carrier to heat the heat exchange tube, avoiding the problem of uneven heating of the heat exchange tube and the cylinder. The utility model can reduce the time required for heat conduction and its adverse effects by circulating high-temperature gas to each component. The method of the utility model is more effective in the overall heat treatment of large equipment. In addition, the gas channel in the utility model refers to the gas that can flow during the heat treatment process, and is not related to the specific medium form introduced into the component during actual use. In actual use, the relevant channel can be a flow channel for liquid medium.

[0044] In the above-mentioned specific implementation manner, the ded gas medium is dedusted and the dedusted gas medium is directly introduced into the gas channel in the heat exchanger 610. The gas circulating in the heat exchanger 610 is the dedusted gas medium, and dust accumulation and other problems will not occur in the heat exchanger 610. In addition, in the scheme of the utility model, the gas in the furnace body is not absorbed through the heat exchanger 610, thereby avoiding the possible pollution caused by powder in the furnace gas. In addition, the utility model realizes the direct extraction of gas medium from the furnace body and returns to the heat exchanger 610 through the circulation pipe 200 by setting up a dust removal device. There is no need to establish an independent circulation pipeline for the channel of the heat exchanger 610, which simplifies the structure of the processing equipment, the operation time and complexity, and can reduce costs and improve efficiency on the basis of achieving overall heat treatment uniformity.

[0045] Specifically, the number of the circulation pipes 200 is at least two (not specifically shown in the drawings). Multiple circulation pipes 200 may be provided to correspond to multiple parts to be treated. When there are different channels in the parts to be treated, circulation pipes 200 may be provided for different channels respectively. For example, in the heat exchanger 610, at least two channels are included, and corresponding circulation pipes 200 may be provided for the two channels respectively. Corresponding circulation pipes 200 are provided for each channel in the heat exchanger 610, so as to further improve the temperature uniformity of different parts of the heat exchanger 610.

[0046] Further reading Figure 2 , Figure 2 It is a structural schematic diagram of a heat treatment device in another embodiment of the utility model. The heat treatment device of the utility model can further include a gas supply system 600, and the gas supply system 600 includes a heat exchanger 610, and the heat exchanger 610 includes a gas outlet pipe 620 connected to the furnace body 100 and leading out the gas medium. The gas medium led out of the furnace body 100 heats the supplied gas in the heat exchanger 610, and the heated gas flows to the heating system 300. During the use of the heat treatment device, a heating burner will be set, and air needs to be supplied to the heating burner. In this process, the utility model fully utilizes the heat by performing heat exchange with the gas medium that needs to be discharged in the furnace body 100, thereby reducing the fuel consumption of the burner to heat this part of fresh air to the temperature in the furnace, saving fuel and reducing the cost of use. In addition to the pipeline for supplying air, the heating system 300 also includes a pipeline for supplying fuel, such as supplying natural gas.

[0047] Specifically, the pipeline for leading out the gas medium from the heat exchanger 610 also includes the dust removal component 400. The lead-out pipeline used by the heat exchanger 610 can adopt the same structure as the circulation pipeline 200, or can be led out from the circulation pipeline 200 after the dust removal component 400. By arranging a switching mechanism on the pipeline, the gas passing through the dust removal component 400 can choose to flow to the furnace body 100 again or exchange heat with the air entering the burner.

[0048] Specifically, the dust removal component 400 includes a U-shaped bend pipe, through which the gas medium in the pipe is inertially dusted. The U-shaped bend pipe is a specific dust removal mechanism, which utilizes the inertial collision between the flue gas and the pipe wall to inertially remove the flue gas flowing in the pipe. In the above structure, a detachable dust recovery device is provided at the bottom of the U-shaped bend to regularly clean the accumulated dust. Through inertial dust removal, dust and other impurities in the gas medium can be removed at a high rate. Other devices that can remove dust from the gas in the pipeline can also be used, such as electrostatic dust removal.

[0049] See also Figure 3-Figure 5 , Figure 3 It is a structural schematic diagram of the temperature measuring end of the thermocouple in the utility model. Figure 4 This is a schematic diagram of the layout of the thermocouple from the side view. Figure 5 This is a schematic diagram of the arrangement of thermocouples on a cross section. It is necessary to measure the temperature of the part to be heat treated. For example, the specific position is set at Figure 4 In the middle dotted frame, when the component 500 to be heat treated is a heat exchanger 610, the thermocouple 230 is arranged at the heat exchange tube. Specifically, the heat treatment device further includes a thermocouple 230, at least two of which are arranged on the component 500 to be heat treated, and the thermocouple 230 includes an anchoring component 240, and the anchoring component 240 includes a tube with a diameter smaller than the inner diameter of the gas channel (the inner diameter of the heat exchange tube). By using a tube with a diameter slightly smaller than the inner diameter of the heat exchange tube to abut the measuring end, the tube can not affect the flow of the gas, and can simultaneously ensure the gas flow and the full contact between the thermocouple and the measuring end and the wall of the heat exchange tube, thereby obtaining a stable and reliable measurement result.

[0050] Furthermore, the thermocouples 230 are evenly and symmetrically distributed on the component to be heat treated 500. Since the size of the component to be heat treated as a whole is usually large, each part needs to be treated under the same temperature conditions, and the temperature of each part needs to be accurately measured. Therefore, thermocouple temperature measurement points are set at various positions of the component to be heat treated 500. Specifically, when the heat exchanger that needs to be heat treated as a whole is treated, thermocouple temperature measurement points are set inside the heat exchanger. The specific positions may include the tube heads where the heat exchange tubes contact the tube sheets on both sides and the center of the heat exchange tubes. In addition, thermocouple temperature measurement points are also set on the surface of the cylinder. The specific positions are arranged on both sides and the center of the cylinder. See Figure 5, can be arranged at the center point and the middle points of the four quadrants according to the pipe layout diagram to ensure the accuracy of the temperature measurement results, and be evenly and symmetrically distributed in the layout position. For the structurally symmetrical component 500 to be heated, it can more accurately reflect the temperature distribution of each position.

[0051] Specifically, one end of the circulation duct 200 that draws out the gas medium from the furnace body is arranged at the top of the furnace body 100. The hot gas circulation of the traditional heat treatment furnace is composed of an air suction port in the middle and an air blowing port at the bottom. The air suction port in the middle sucks in the high-temperature flue gas and then discharges it through the bottom to heat the equipment in the furnace. However, the height of the heat treatment furnace is generally 5 to 6 meters, and the diameter of the heat exchanger rarely exceeds 3 meters. Since the hot gas goes up, nearly half of the high-temperature flue gas in the upper part of the heat treatment furnace will be wasted. The current technical solution adopts the method of setting an induced draft fan on the top of the furnace to make full use of the high-temperature flue gas in the furnace, thereby improving the overall thermal utilization rate of the equipment and reducing production costs.

[0052] Specifically, it also includes a control system, which is connected to the heating system 300, the thermocouple 230 and the exhaust component, and controls the power of the heating system 300 and / or the exhaust component according to the measurement result of the thermocouple 230. The control system can be implemented using a computer, and each component is transmitted to the system through a signal line, and the thermocouple temperature measurement results are statistically sent to the computer system. According to the principle that the temperature difference of different parts does not exceed 15°C, the burner and the induced draft fan at the inlet of the circulation pipeline are adjusted. If the barrel temperature is higher than the internal temperature of the heat exchange tube, the burner power is reduced and the induced draft fan power is increased; on the contrary, if the internal temperature of the heat exchange tube is higher than the barrel temperature, the burner power is increased and the induced draft fan power is reduced. In order to keep the heat exchanger evenly heated inside and outside, it is ensured that the temperature difference can be automatically adjusted during the overall heat treatment, so that the heat treatment device is more intelligent.

[0053] Specifically, the circulation pipeline 200 further includes an auxiliary heating device, which is used to heat the gas medium in the circulation pipeline 200. The auxiliary heating device can heat the gas medium in the circulation pipeline 200, and is started when the temperature of the gas medium in the circulation pipeline 200 decreases and is lower than the temperature in the furnace body 100, so as to increase the temperature of the gas medium in the pipeline, and when the gas medium is input into the furnace body 100, ensure that the input gas medium is consistent with the temperature of the internal gas medium, thereby generating a more stable temperature field. Specific embodiment 1

[0055] Place the parts to be heat treated into the furnace body, close the furnace body, and start the heating system for heating. After the heating system is turned on, start the circulation pipeline, extract the gas medium in the furnace body from one end of the furnace body, and then pass it into the furnace body through the other end of the circulation pipeline to strengthen the flow circulation of the gas medium and improve the uniformity of temperature distribution. When the gas medium flows in the circulation pipeline, the dust in the gas medium is removed by the dust removal component. Specific embodiment 2

[0057] The component to be heat treated is placed in the furnace body, which has an internal gas channel. The circulation pipeline and the internal gas channel of the component to be heat treated are connected through a gas connecting pipeline. The furnace body is closed, and the heating system is turned on for heating. After the heating system is turned on, the circulation pipeline is started, and the gas medium in the furnace body is extracted from one end of the furnace body and then introduced into the furnace body through the other end of the circulation pipeline, so as to strengthen the flow circulation of the gas medium and improve the uniformity of temperature distribution. When the gas medium flows in the circulation pipeline, the dust in the gas medium is removed by the dust removal component, and the gas medium flows into the internal gas channel of the component to be heat treated through the circulation pipeline, and the inside and outside of the component to be heat treated are in contact with the gas medium of the same temperature. Specific embodiment three

[0059] On the basis of the second specific embodiment, a gas supply system including a heat exchanger is provided, and a gas outlet pipe is connected to the furnace body and outlets the gas medium. The gas medium drawn out from the furnace body heats the supplied gas in the heat exchanger, and the heated gas flows to the heating system.

[0060] From the foregoing, it can be seen that the heat treatment device of the present invention circulates the gas medium through a circulation pipe, so that the temperature distribution of various parts of the component during the heat treatment process is uniform, so that the various parts of the component can be heat treated at the same temperature, avoiding the influence of thermal stress differences between different positions. The dust, particles and other pollutants in the gas medium are removed by the dust removal component, which can prevent the accumulation of dust and other pollutants in the system. By introducing dust-removed gas into the component with an internal gas channel, the cleanliness inside the component is improved while ensuring uniform heat treatment.

[0061] The above is only a specific implementation of the present invention, and any improvements made based on the concept of the present invention are deemed to be within the protection scope of the present invention.

Claims

1. A heat treatment device, characterized in that: The invention comprises a furnace body (100), a circulation pipe (200) and a heating system (300); the furnace body (100) is used to place a component to be heat-treated (500), and the component to be heat-treated (500) is heat-treated in the furnace body (100); both ends of the circulation pipe (200) are connected to the furnace body (100) and comprise an exhaust component, so that the gas medium in the furnace body (100) flows out of the furnace body (100) along one end of the circulation pipe (200) and then flows into the furnace body (100) through the other end, so that the gas medium circulates; and the heating system (300) is used to heat the gas medium in the furnace body (100).

2. The heat treatment device according to claim 1, characterized in that It also includes a dust removal component (400). The dust removal component (400) is arranged on the circulation pipeline (200) and is used to remove dust in the gas medium.

3. The heat treatment device according to claim 2, characterized in that The furnace body (100) further comprises a gas connection pipe (110), one end of which is connected to one end of the circulation pipe (200) into which the gas medium flows, and is used to guide the gas medium flowing into the furnace body (100) from the circulation pipe (200) to a target position.

4. The heat treatment device according to claim 3, characterized in that The component to be heat treated (500) comprises a gas channel therein, and the other end of the gas connecting pipe (110) is connected to the gas channel of the component to be heat treated (500).

5. The heat treatment device according to claim 1, characterized in that The number of the circulation pipes (200) is at least two.

6. The heat treatment device according to claim 1, characterized in that It also includes a gas supply system (600), the gas supply system (600) including a heat exchanger (610), the heat exchanger (610) including a gas outlet pipe (620) connected to the furnace body (100) and leading out a gas medium, the gas medium led out of the furnace body (100) heats the supplied gas in the heat exchanger (610), and the heated gas flows to the heating system (300).

7. The heat treatment device according to claim 6, characterized in that The pipeline for leading the gaseous medium out of the heat exchanger (610) also includes a dust removal component (400).

8. The heat treatment device according to claim 2 or 7, characterized in that: The dust removal component (400) comprises a U-shaped bent pipe, through which the gas medium in the pipe is subjected to inertial dust removal.

9. The heat treatment device according to claim 1, characterized in that: It also includes thermocouples (230), wherein there are at least two thermocouples (230) arranged on the component (500) to be heat treated.

10. The heat treatment device according to claim 9, characterized in that The thermocouple (230) comprises an anchoring component (240), wherein the anchoring component (240) comprises a tube having a diameter smaller than an inner diameter of a gas channel.

11. The heat treatment device according to claim 9, characterized in that: The thermocouples are evenly and symmetrically distributed on the component to be heat treated (500).

12. The heat treatment device according to claim 1, characterized in that One end of the circulation pipe (200) for leading out the gas medium from the furnace body (100) is arranged at the top of the furnace body (100).

13. The heat treatment device according to claim 1, characterized in that: The circulation pipeline (200) further comprises an auxiliary heating device, wherein the auxiliary heating device is used to heat the gas medium in the circulation pipeline (200).

14. The heat treatment device according to claim 9, characterized in that It also includes a control system, which is connected to the heating system (300), the thermocouple (230) and the exhaust component, and controls the power of the heating system (300) and / or the exhaust component according to the measurement result of the thermocouple (230).

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