Heat energy exchange device

Abstract

The utility model discloses a heat energy exchange device, and belongs to the technical field of heat energy exchange equipment, the heat energy exchange device comprises a shell, the interior of the shell is provided with a cavity communicating with the two ends of the shell, and the two ends of the shell are used for flue gas introduction and external communication respectively; the heat exchanger core comprises an air inlet pipe set and an air outlet pipe set which are installed on the shell, the air inlet pipe set is used for introducing combustion-supporting fluid, and the air outlet pipe set is used for discharging the combustion-supporting fluid; in the shell, the gas inlet pipe group and the gas outlet pipe group are provided with heat transfer areas in contact with the cavity, so that combustion-supporting fluid entering the gas inlet pipe group and the gas outlet pipe group can exchange heat with combustion-supporting fluid passing through the fluid cavity; the flow guide box is arranged in the shell and provided with a flow guide channel, and the two ends of the flow guide box communicate with the air inlet pipe set and the air outlet pipe set correspondingly, so that combustion-supporting fluid enters the air outlet pipe set from the air inlet pipe set. The problem that a large amount of flue gas heat is wasted can be solved, meanwhile, the temperature of the combustion-supporting fluid is increased, the combustion efficiency in the heat treatment furnace is improved, fuel consumption is reduced, and the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of heat exchange equipment, and in particular relates to a heat exchange device. Background Art

[0002] A heat treatment furnace is an electric furnace or fuel-fired furnace used to heat charge materials. Commonly used heat treatment furnaces include box-type resistance furnaces, pit-type resistance furnaces, gas carburizing furnaces, and salt bath furnaces. A high-temperature rotary annealing furnace is also a type of heat treatment furnace. These large-diameter, circular, intermittently rotating furnaces consist of a loading and unloading section, a preheating section, a soaking section, a heating section, a soaking section, and a cooling section. They utilize open-flame burners to heat the entire coil, generating hot flue gas with high temperatures and high gas volumes.

[0003] The flue gas generated by the existing high-temperature rotary annealing furnace is discharged directly or after treatment, resulting in a large amount of waste of flue gas heat and low thermal energy utilization rate. For the annealing furnace, although there is currently an annealing furnace heat energy recovery device, it only reuses the flue gas temperature and does not target the working process of the annealing furnace, which has limited improvement in the thermal energy utilization efficiency of the annealing furnace. Utility Model Content

[0004] The present application aims to solve the technical problem of heat energy recycling in heat treatment furnaces to at least a certain extent. To this end, the present application provides a heat energy exchange device that can solve the problem of large-scale waste of flue gas heat, while increasing the temperature of the combustion-supporting fluid, improving the combustion efficiency in the heat treatment furnace, reducing fuel consumption, and achieving the purpose of energy conservation and emission reduction.

[0005] The present invention provides a heat exchange device, comprising:

[0006] The shell has a cavity inside that is connected to both ends. One end of the shell is used to allow the flue gas generated by the heat treatment furnace to pass through, and the other end is used for external communication;

[0007] The heat exchanger core includes an inlet pipe group and an outlet pipe group, which are installed in the shell. The inlet pipe group is connected to the outside of the shell for introducing the combustion-supporting fluid, and the outlet pipe group is connected to the outside of the shell for discharging the combustion-supporting fluid after heat exchange. Inside the shell, the inlet pipe group and the outlet pipe group have a heat transfer area in contact with the fluid cavity, so that the combustion-supporting fluid entering the inlet pipe group and the outlet pipe group can exchange heat with the combustion-supporting fluid passing through the fluid cavity.

[0008] The guide box is arranged in the shell and has a guide channel connecting its two ends. The two ends of the guide box are respectively connected to the air inlet pipe group and the air outlet pipe group, so that the combustion-supporting fluid discharged from the air inlet pipe group enters the air outlet pipe group after passing through the guide channel.

[0009] In an optional embodiment, the air inlet pipe group and the air outlet pipe group respectively include a plurality of heat exchange tubes arranged in parallel, so that the combustion-supporting fluid can flow through the plurality of heat exchange tubes.

[0010] In an optional embodiment, the air inlet pipe group and the air outlet pipe group are combined as one pipe group, and the shell is installed with multiple pipe groups.

[0011] In an optional embodiment, between adjacent tube groups, the outlet of the air outlet tube group is connected to the inlet of the air inlet tube group in the adjacent tube group.

[0012] In an optional embodiment, in each tube group, the inlet diameter of the air inlet tube group is smaller than the outlet diameter of the air outlet tube group.

[0013] In an optional embodiment, a diverter plate is provided in the guide box, which divides the guide channel into an inner area and an outer area. The inner area connects the heat exchange tubes in the air inlet pipe group and the air outlet pipe group that are close to each other, and the outer area connects the heat exchange tubes in the air inlet pipe group and the air outlet pipe group that are far away from each other.

[0014] In an optional embodiment, an inlet bellows is further included, which is installed on the shell, and one end of the inlet bellows is connected to the inlet of the air intake pipe group, and the other end of the inlet bellows is used for introducing the combustion-supporting fluid.

[0015] In an optional embodiment, an outlet bellows is further included, which is installed on the shell, and one end of the outlet bellows is connected to the outlet of the outlet pipe group, and the other end of the outlet bellows is connected to the inlet bellows of the adjacent pipe group or is used for exhaust.

[0016] In an optional embodiment, a return air heat exchange pipe is further included, with two ends respectively connected to the outlet wind box and the inlet wind box of the adjacent tube group.

[0017] In an optional embodiment, the inner wall of the shell is paved with a refractory layer, and the surface of the refractory layer is further covered with a layer structure paved with a refractory castable material.

[0018] It can be seen from the above technical solution that the beneficial effects of this application are:

[0019] The present application can recover the waste gas heat generated by the heat treatment furnace, guide the combustion-supporting fluid into it through the heat exchanger core, and provide space for heat exchange for the combustion-supporting fluid in the shell, and connect the heat exchanger core through the guide box, so that the combustion-supporting fluid entering through the air inlet pipe group flows out in the opposite direction from the air outlet pipe group, which also increases the area and length of the heat exchange of the combustion-supporting fluid. The combustion-supporting fluid is connected through the shell, and the combustion-supporting fluid can enter the shell and fully exchange heat with the air inlet pipe group and the air outlet pipe group in the cavity of the shell, which can solve the problem of large-scale waste of flue gas heat. The flue gas heats the combustion-supporting fluid entering the heat treatment furnace and increases the temperature of the combustion-supporting fluid. The heated combustion-supporting fluid is mixed with the combustible gas and burned in the heat treatment furnace, which can relatively reduce the heat required to heat the combustion-supporting fluid before combustion in the heat treatment furnace, reduce fuel consumption, achieve the purpose of energy saving and emission reduction, and also improve combustion efficiency. It not only reduces the exhaust flue gas temperature, but also reduces the heat loss of subsequent equipment of the flue gas, thereby increasing the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other embodiments and drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 The following is a working diagram of an embodiment of the heat exchange device of the present invention;

[0022] Figure 2 A partial cross-sectional schematic diagram of an embodiment of the heat exchange device of the present utility model is shown;

[0023] Figure 3 A side view schematic diagram of an embodiment of the heat exchange device of the present utility model is shown;

[0024] Figure numerals: 100, heat exchange device; 110, shell; 111, cavity; 112, detection hole; 113, inspection port; 120, heat exchanger core; 121, air inlet pipe group; 122, air outlet pipe group; 123, heat exchange pipe; 130, guide box; 130a, inner area; 130b, outer area; 131, diverter plate; 140, inlet bellows; 150, outlet bellows; 160, return air heat exchange pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] In addition, in this utility model, the descriptions of "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0029] The present application is described below with reference to specific embodiments and with reference to the accompanying drawings:

[0030] Please refer to Figure 1In an embodiment of the present application, a heat exchange device 100 is provided, which includes a shell 110, a heat exchanger core 120 and a guide box 130. The shell 110 can be made of metal material, such as steel plates welded together. The surface of the steel plates is first pretreated, then cut into corresponding structural shapes, and finally welded together. After welding, non-destructive testing is performed on welds with flaw detection requirements, and then annealing and stress relief treatment are performed. The surface is then shot blasted and primer-coated. After passing the test, machining is performed. Reinforcement ribs can also be welded on the steel plates on both sides of the shell 110 to enhance structural strength. A fluid cavity 111 is provided inside the shell 110, which connects its two ends. One end of the shell 110 is used to allow the flue gas generated by the heat treatment furnace to pass through, and the other end is used to connect to the outside. As shown in the figure, the right end of the shell 110 is connected to the heat treatment furnace through a pipe. The left end of the shell 110 is the outlet end and the right end is the air inlet end. The air entering from the right end of the shell 110 flows through the cavity 111 and is discharged from the left end of the shell 110; after the temperature of the flue gas drops after passing through the cavity 111, it is discharged to the outside through the outlet end of the shell 110 or connected to other flue gas treatment equipment. Sealing packing is used when the two ends of the shell 110 are connected to the outside to ensure the sealing of the flue gas. For example, sealing packing is used when the right end of the shell 110 is connected to the outside.

[0031] The heat exchanger core 120 includes an air inlet pipe group 121 and an air outlet pipe group 122. The air inlet pipe group 121 and the air outlet pipe group 122 are installed in the shell 110, and the air inlet pipe group 121 is connected to the outside of the shell 110 for introducing the combustion-supporting fluid, that is, the top of the air inlet pipe group 121 is connected to the outside, and the combustion-supporting fluid enters from the top of the air inlet pipe group 121 and flows out from the bottom. The air outlet pipe group 122 is connected to the outside of the shell 110 for discharging the combustion-supporting fluid after heat exchange, that is, the bottom end of the air outlet pipe group 122 can be connected to the bottom end of the air inlet pipe group 121. The top of the air outlet pipe group 122 is connected to the outside, and the combustion-supporting fluid enters from the bottom of the air outlet pipe group 122 and is discharged from the top; in the shell 110, the air inlet pipe group 121 and the air outlet pipe group 122 have a heat transfer area in contact with the cavity 111, that is, the combustion-supporting fluid can transfer heat with the flue gas in the cavity 111 through the side walls of the air inlet pipe group 121 and the side walls of the air outlet pipe group 122, so that the combustion-supporting fluid entering the air inlet pipe group 121 and the air outlet pipe group 122 can exchange heat with the combustion-supporting fluid passing through the fluid cavity 111. The guide box 130 is arranged in the shell 110 and is located at the bottom of the cavity 111. The guide box 130 is in the shape of a box with openings at both ends of its top, and the two openings are respectively connected to the bottom end of the air inlet pipe group 121 and the bottom end of the air outlet pipe group 122. In this way, in the shell 110, the air inlet pipe group 121, the air outlet pipe group 122 and the guide box 130 form a U shape. The guide box 130 has a guide channel connecting its two ends. The two ends of the guide box 130 are respectively connected to the internal air flow channel of the heat exchange pipe 123 of the air inlet pipe group 121 and the internal air flow channel of the heat exchange pipe 123 of the air outlet pipe group 122, so that the combustion-supporting fluid discharged from the air inlet pipe group 121 enters the air outlet pipe group 122 after passing through the guide channel.

[0032] During normal operation, combustion air enters the heat exchanger core 120 through a pipe. A blower is installed at the front end of the combustion air pipe to blow the combustion air into the air pipe and maintain a pressure of 5-20kPa. After ignition in the heat treatment furnace, the combustion air continues to flow into the air inlet pipe group 121, passes through the guide box 130, and is discharged from the air outlet pipe group 122. It is then supplied to the heat treatment furnace and mixed with the fuel gas for combustion. The hot flue gas generated in the furnace of the heat treatment furnace flows through the furnace into the flue gas pipe, and then enters the shell 110 through the air inlet end. In the cavity 111, heat is transferred to the air inlet pipe group 121 and the air outlet pipe group 122 in the form of heat conduction, heat radiation, and heat convection. After the combustion fluid in the air inlet pipe group 121 and the air outlet pipe group 122 is heated, the purpose of preheating the combustion air is achieved.

[0033] The heat energy of the heat treatment furnace of the prior art cannot be reused in the heat treatment process, and the generated combustion-supporting fluid is directly discharged or discharged after treatment, and cannot be reused in the existing heat treatment furnace. The thermal energy efficiency needs to be improved. The present application can recover the waste gas heat generated by the heat treatment furnace, guide the combustion-supporting fluid into it through the heat exchanger core 120, and provide a heat exchange space for the combustion-supporting fluid in the shell 110. The heat exchanger core 120 is connected through the guide box 130, so that the combustion-supporting fluid entering through the air inlet pipe group 121 flows out from the air outlet pipe group 122 in the opposite direction, which also increases the area and length of the heat exchange between the combustion-supporting fluid and the flue gas. The combustion-supporting fluid is connected through the shell 110, and the combustion-supporting fluid can enter the shell 110 and communicate with the air inlet pipe group 121 and the air outlet pipe group 122 in the cavity 111 of the shell 110. Group 122 fully carries out heat exchange, which can solve the problem of large-scale waste of flue gas heat. The flue gas heats the combustion-supporting fluid entering the heat treatment furnace, thereby increasing the temperature of the combustion-supporting fluid. The heated combustion-supporting fluid is mixed with the combustible gas in the heat treatment furnace and burns, which can relatively reduce the heat required to heat the combustion-supporting fluid before combustion in the heat treatment furnace, reduce fuel consumption, achieve the purpose of energy conservation and emission reduction, and improve combustion efficiency. It not only reduces the exhaust flue gas temperature, but also reduces the heat loss of subsequent flue gas equipment, such as fans, bearings, regulating valves and other equipment and devices, thereby reducing operating costs and increasing equipment service life.

[0034] Please refer to Figure 2In an optional embodiment, the air inlet pipe group 121 and the air outlet pipe group 122 respectively include a plurality of heat exchange tubes 123 arranged in parallel, so that the combustion-supporting fluid can flow through the plurality of heat exchange tubes 123. The heat exchange tubes 123 are heat exchanger components, such as metal tubes with high thermal conductivity, including steel tubes, alloy tubes, etc. The flue gas and the combustion-supporting fluid exchange heat through the tube walls of the heat exchange tubes 123. The plurality of heat exchange tubes 123 are arranged vertically in parallel to form an array-type air inlet pipe group 121 and air outlet pipe group 122. In the air inlet pipe group 121 and the air outlet pipe group 122, the plurality of heat exchange tubes 123 are arranged as described above, and are roughly square or rectangular in cross section, so that the ends of the air inlet pipe group 121 and the air outlet pipe group 122 are both square. By adopting the arrangement of multiple heat exchange tubes 123, each heat exchange tube 123 can divert a portion of the combustion-supporting fluid, and each heat exchange tube 123 can exchange heat with the flue gas in the cavity 111, which is equivalent to increasing the contact area between the combustion-supporting fluid and the flue gas, further improving the heat exchange efficiency, heating the combustion-supporting fluid more quickly, and effectively reducing the heat overflow of the high-temperature flue gas in the furnace. The heat exchange tubes 123 can be made of heat-resistant and corrosion-resistant materials. The content of heat-resistant and corrosion-resistant materials is set so that the heat exchange tubes 123 in the air inlet pipe group 121 and the heat exchange tubes 123 in the air outlet pipe group 122 have a trend of gradually decreasing heat resistance and corrosion resistance according to the direction of flue gas flow; for example, the heat exchange tubes 123 near the flue gas inlet end are made of silicon carbide ceramic tubes, and the heat exchange tubes 123 near the flue gas outlet end are made of 022Cr12 stainless steel steel pipes to ensure the airtightness at both ends of the heat exchange tubes 123.

[0035] In an optional embodiment, the air inlet pipe group 121 and the air outlet pipe group 122 serve as a group of pipe groups, and the shell 110 is installed with multiple pipe groups; the air inlet pipe group 121 and the air outlet pipe group 122 are arranged to be parallel to each other and spaced apart, and the arrangement direction of the air inlet pipe group 121 and the air outlet pipe group 122 is perpendicular to the flow direction of the combustion-supporting fluid in the cavity 111. This can increase the contact area between the combustion-supporting air and the flue gas, and heat the combustion-supporting air more fully. As shown in the figure, multiple groups of mounting ports are opened on the top of the shell 110, with two in each group. The arrangement of multiple mounting ports allows multiple pipe groups to be arranged along the flow direction of the flue gas, and the air inlet pipe group 121 and the air outlet pipe group 122 are respectively inserted vertically into the corresponding groups of mounting ports, so that the arrangement direction of the air inlet pipe group 121 and the air outlet pipe group 122 is perpendicular to the two end directions of the shell 110, and the combustion-supporting fluid flowing into the air inlet pipe group 121 and the combustion-supporting fluid flowing out of the air outlet pipe group 122 can both undergo heat exchange with the flue gas in the cavity 111. The arrangement order of the air inlet pipe group 121 and the air outlet pipe group 122 is: in the pipe group of the same group, the air inlet pipe group 121 is close to the end of the shell 110 where the flue gas is discharged, and the air outlet pipe group 122 is close to the end of the shell 110 where the flue gas enters. In this way, the area with the highest flue gas temperature in the cavity 111 and the combustion-supporting fluid discharged from the air outlet pipe group 122 can be heated as much as possible, and the temperature when it is discharged is closest to the temperature of the incoming flue gas, which further improves the utilization efficiency of the flue gas.

[0036] In an optional embodiment, between adjacent tube groups, the outlet of the outlet tube group 122 is connected to the inlet of the inlet tube group 121 in the adjacent tube group, that is, in the adjacent tube groups, in the flow direction of the combustion-supporting fluid, the outlet of the outlet tube group 122 located upstream is connected by a pipe, and the other end of the pipe is connected to the inlet of the adjacent inlet tube group 121. This increases the number of heat transfers of the combustion-supporting fluid and allows the combustion-supporting fluid to transfer heat with the flue gas again in the cavity 111. In an optional embodiment, in each tube group, the inlet diameter of the inlet tube group 121 is smaller than the outlet diameter of the outlet tube group. Considering the thermal expansion and contraction of the gas, the size of the combustion-supporting fluid outlet of each tube group is designed to be larger than the inlet size. For example, the inner diameter of the top of the inlet tube group 121 is smaller than the inner diameter of the top of the outlet tube group 122. The outer size of the inlet tube group 121 can also be designed to be smaller than the outer size of the outlet tube group 122.

[0037] In an optional embodiment, a diverter plate 131 is provided in the guide box 130, and the diverter plate 131 divides the guide channel into an inner area 130a and an outer area 130b. The inner area 130a is connected to the heat exchange tubes 123 in the air inlet pipe group 121 and the air outlet pipe group 122 that are close to each other, and the outer area 130b is connected to the heat exchange tubes 123 in the air inlet pipe group 121 and the air outlet pipe group 122 that are far away from each other. As shown in the figure, the heat exchange tubes 123 in the air inlet pipe group 121 and the air outlet pipe group 122 are divided into two halves. The half of the heat exchange tubes 123 in the tube group 121 near the outlet tube group 122 and the half of the heat exchange tubes 123 in the outlet tube group 122 near the inlet tube group 121 are connected to the inner region 130a, while the other half of the heat exchange tubes 123 in the inlet tube group 121 away from the outlet tube group 122 and the other half of the heat exchange tubes 123 in the outlet tube group 122 away from the inlet tube group 121 are connected to the outer region 130b. This allows the combustion-supporting fluid exiting the inlet tube group 121 to be split into two mutually non-interfering fluid streams before entering the outlet tube group 122. This arrangement also effectively improves the uniformity of heating the combustion-supporting air, preventing uneven heating of the outlet combustion-supporting air from affecting combustion efficiency within the heat treatment furnace. Reinforcing ribs may also be provided within the guide box 130 to prevent thermal deformation and the resulting breakage of welds.

[0038] Please refer to Figure 3In an optional embodiment, an inlet bellows 140 is further included, mounted on the housing 110. One end of the inlet bellows 140 is connected to the inlet of the inlet pipe group 121, and the other end of the inlet bellows 140 is used to introduce a combustion-supporting fluid. In an optional embodiment, an outlet bellows 150 is further included, mounted on the housing 110. One end of the outlet bellows 150 is connected to the outlet of the outlet pipe group 122, and the other end of the outlet bellows 150 is connected to the inlet bellows 140 of an adjacent pipe group or is used for exhaust. The above-mentioned inlet bellows 140 and outlet bellows 150 respectively adopt reducing pipes. This is because they are generally circular pipes when connected to the outside, and the ends of the air inlet pipe group 121 and the air outlet pipe group 122 are square. One end of the inlet bellows 140 is square, matching the inlet square of the air inlet pipe group 121, and this end is fixed by welding. The other end of the inlet bellows 140 is circular, which is convenient for connecting to a circular pipe. This end is fixed by welding. One end of the outlet bellows 150 is also square, matching the outlet square of the air outlet pipe group 122, and the other end of the outlet bellows 150 is circular, which is convenient for connecting to a circular pipe. The setting method is the same as that of the inlet bellows 140. In an optional embodiment, a return air heat exchange pipe 160 is further included, with its ends respectively connected to the outlet wind box 150 and the inlet wind box 140 of the adjacent tube group. The return air heat exchange pipe 160 is a pipe connecting adjacent tube groups and is, for example, a circular pipe. One end of the return air heat exchange pipe 160 is connected to the outlet wind box 150, and the other end of the return air heat exchange pipe 160 is connected to the inlet wind box 140 of the adjacent tube group. The two connections are flanged. The return air heat exchange pipe 160 is an inverted "U"-shaped pipe, connecting the two tube groups through the return air heat exchange pipe 160. The inlet wind box 140 and the outlet wind box 150 connected at both ends of the return air heat exchange pipe 160 have the same diameter. The return air heat exchange pipe 160 can be used to guide the combustion-supporting fluid from the outlet tube group 122 into the inlet tube group 121 of the next tube group for further heat exchange.

[0039] In an optional embodiment, the shell 110 is a heat-resistant metal structure, such as heat-resistant steel, etc. The inner wall of the shell 110 is paved with a refractory layer, such as a refractory fiber layer, a refractory fiber board, such as a calcium silicate board. When a refractory fiber board is used, the refractory fiber board is fixed to the inner side of the shell 110 by anchors, such as bolts, screws, etc. The surface of the refractory layer is also covered with a layer structure of refractory castable material. The total thickness of the layer structure formed by the refractory layer and the refractory castable material is selected to be 150mm-300mm. The refractory castable material is a mixture of refractory aggregate, binder and admixture. Water (or liquid binder) is added to mix it into a mud material that can be constructed by pouring. It can be laid on the surface of the refractory layer to form a layer of refractory structure. This can isolate hot smoke and prevent smoke erosion and impact on the shell 110. It also reduces the curvature of the shell 110 to a certain extent and increases the service life of the shell 110.

[0040] In an optional embodiment, a temperature detector is further included, and multiple temperature detectors are respectively installed at both ends of the shell 110. Specifically, a detection hole 112 is opened at the air inlet and outlet ends of the shell 110 to connect to the interior thereof. The temperature detector is a temperature sensor or an electronic thermometer, and its temperature sensing element extends into the shell 110 through the detection hole 112 to monitor the temperature change of the flue gas at the flue gas inlet and outlet. In an optional embodiment, an inspection port 113 is also opened on the side wall of the shell 110. The inspection port 113 has an inspection door, which adopts hinges or other connection methods that are easy to open. Multiple inspection ports 113 can be set, such as at the side wall of the shell 110 corresponding to the air inlet, outlet, and between the two groups of pipes, so that the interior of the shell 110 can be easily inspected through the inspection port 113. In an optional embodiment, a base is also included. The bottom of the shell 110 is welded to the base, and the device can be fixed to the civil foundation or work area through the base.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "optional example" or "optional implementation" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation 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 this specification.

[0042] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0043] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A heat exchange device, characterized in that: include: The shell (110) is provided with a cavity (111) communicating with both ends thereof, one end of the shell (110) is used for introducing the flue gas generated by the heat treatment furnace, and the other end is used for communicating with the outside; The heat exchanger core (120) comprises an air inlet pipe group (121) and an air outlet pipe group (122), wherein the air inlet pipe group (121) and the air outlet pipe group (122) are installed on the shell (110), and the air inlet pipe group (121) is connected to the outside of the shell (110) for introducing a combustion-supporting fluid, and the air outlet pipe group (122) is connected to the outside of the shell (110) for connecting to a heat treatment furnace; inside the shell (110), the air inlet pipe group (121) and the air outlet pipe group (122) have a heat transfer area in contact with the fluid cavity (111), so that the flue gas entering the air inlet pipe group (121) and the air outlet pipe group (122) can exchange heat with the combustion-supporting fluid passing through the fluid cavity (111); A flow guide box (130) is provided in the housing (110), and a flow guide channel is provided in the flow guide box (130) for communicating with both ends thereof. The two ends of the flow guide box (130) are respectively connected to the air inlet pipe group (121) and the air outlet pipe group (122), so that the combustion-supporting fluid discharged from the air inlet pipe group (121) passes through the flow guide channel and then enters the air outlet pipe group (122).

2. The heat exchange device according to claim 1, characterized in that The air inlet pipe group (121) and the air outlet pipe group (122) respectively include a plurality of heat exchange tubes (123) arranged in parallel, so that the combustion-supporting fluid can flow through the plurality of heat exchange tubes (123).

3. The heat exchange device according to claim 1, characterized in that The air inlet pipe group (121) and the air outlet pipe group (122) serve as a group of pipe groups, and the housing (110) is equipped with a plurality of groups of the pipe groups.

4. The heat exchange device according to claim 3, characterized in that: Between adjacent tube groups, the outlet of the air outlet tube group (122) is connected to the inlet of the air inlet tube group (121) in the adjacent tube group.

5. The heat exchange device according to claim 3, characterized in that: In each of the tube groups, the inlet diameter of the air inlet tube group (121) is smaller than the outlet diameter of the air outlet tube group.

6. The heat exchange device according to claim 1, characterized in that: A diverter plate (131) is provided in the flow guide box (130), and the diverter plate (131) divides the flow guide channel into an inner area (130a) and an outer area (130b), wherein the inner area (130a) is connected to the heat exchange tubes (123) at positions close to each other in the air inlet pipe group (121) and the air outlet pipe group (122), and the outer area (130b) is connected to the heat exchange tubes (123) at positions far away from each other in the air inlet pipe group (121) and the air outlet pipe group (122).

7. The heat exchange device according to claim 1, characterized in that: It also includes an inlet wind box (140) installed on the shell (110), and one end of the inlet wind box (140) is connected to the inlet of the intake pipe group (121), and the other end of the inlet wind box (140) is used for introducing the combustion-supporting fluid.

8. The heat exchange device according to claim 7, characterized in that: It also includes an outlet bellows (150) installed on the housing (110), with one end of the outlet bellows (150) connected to the outlet of the outlet pipe group (122), and the other end of the outlet bellows (150) connected to the inlet bellows (140) of the adjacent pipe group or used for exhaust.

9. The heat exchange device according to claim 8, characterized in that: It also includes a return air heat exchange pipe (160), two ends of which are respectively connected to the outlet wind box (150) and the inlet wind box (140) of the adjacent pipe group.

10. The heat exchange device according to claim 1, characterized in that: The inner wall of the shell (110) is paved with a refractory layer, and the surface of the refractory layer is also covered with a layer structure paved with refractory casting material.

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