Multi-media coal gas heat exchanger and method of using same

Abstract

The application provides a multi-medium coal gas heat exchanger and a use method thereof, which comprises a heat exchanger body, a heat exchange pipe, a coke oven gas heat exchange channel for heating and heat exchange of coke oven gas is arranged in the heat exchanger body, a converter gas heat exchange channel for heating and heat exchange of converter gas is arranged on the lower side of the coke oven gas heat exchange channel, a blast furnace gas heat exchange channel for heating and heat exchange of blast furnace gas is arranged on the lower side of the converter gas heat exchange channel, a flue gas heat exchange channel for heating and heat exchange of flue gas is arranged on the lower side of the blast furnace gas heat exchange channel, a circulating member for circulating and guiding part of the flue gas is arranged in the flue gas heat exchange channel, and the both ends of the heat exchange pipe are provided with fixing devices. The application utilizes the characteristics of the heat pipe, sets the flue gas heat exchange unit on the hot end of the heat pipe, and connects the three coal gas heat exchange units in series on the cold end of the heat pipe, so that sufficient cooling resources can be ensured to cool the flue gas, the exhaust gas temperature of the boiler is reduced, and the efficiency of the boiler is improved.

Description

Technical Field

[0001] This invention relates to the field of heat exchangers, and more specifically, to a multi-media gas heat exchanger and its method of use. Background Technology

[0002] Currently, after the blast furnace gas, converter gas, and coke oven gas generated during steel plant production processes are used by the plant's process users, there is still a significant surplus. This surplus gas is typically burned in a gas boiler to produce steam for power generation. Because both the gas generation and consumption ends are unstable, the surplus quantities of these various gases also fluctuate. The current practice is to first mix these three types of gas to create a mixed gas before it enters a gas heat exchanger for heating, and finally, it enters the gas boiler for combustion. However, because burners cannot burn mixed gas with large fluctuations in calorific value, steel plants with significant fluctuations in the quantities of various gases generally install separate blast furnace gas burners, converter gas burners, and coke oven gas burners on the boiler. Blast furnace gas, which has a lower calorific value and a larger proportion of gas volume, enters the boiler for combustion after heat exchange in the gas heat exchanger. Converter gas and coke oven gas, which have a smaller proportion of gas volume, enter the boiler directly for combustion without heating. This means that the flue gas at approximately 200°C at the boiler's tail flue is cooled only by blast furnace gas after passing through the gas heat exchanger.

[0003] When the boiler is under low load or the proportion of blast furnace gas is low, it is difficult to reduce the temperature to the design value, resulting in excessively high flue gas temperature and energy waste.

[0004] Therefore, we have made improvements to this and proposed a multi-media gas heat exchanger and its usage method. Summary of the Invention

[0005] The purpose of this invention is to address the problem that when the boiler is under low load or the proportion of blast furnace gas is low, it is difficult to reduce the temperature to the design value, resulting in excessively high flue gas temperature and energy waste.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] Multi-media gas heat exchangers and their usage methods are proposed to improve the above-mentioned problems.

[0008] The application is as follows:

[0009] The device includes a heat exchanger body and heat exchange tubes. The heat exchanger body has a coke oven gas heat exchange channel inside for heating and exchanging heat with coke oven gas. Below the coke oven gas heat exchange channel is a converter gas heat exchange channel for heating and exchanging heat with converter gas. Below the converter gas heat exchange channel is a blast furnace gas heat exchange channel for heating and exchanging heat with blast furnace gas. Below the blast furnace gas heat exchange channel is a flue gas heat exchange channel for cooling and exchanging heat with flue gas. The flue gas heat exchange channel has a circulation component inside for guiding a portion of the flue gas through circulation. The heat exchange tubes have fixing devices at both ends.

[0010] This invention utilizes the characteristics of heat pipes, setting up a flue gas heat exchange unit at the hot end of the heat pipe and connecting three gas heat exchange units in series at the cold end of the heat pipe. Even when the flow rates of the three types of gas fluctuate continuously, it can ensure that there are sufficient cooling resources to cool the flue gas, reduce the boiler exhaust temperature, and improve boiler efficiency.

[0011] In a preferred embodiment of the multi-media gas heat exchanger and its usage method provided by the present invention, the heat-absorbing end of the heat exchange tube is disposed inside the flue gas heat exchange channel, and the heat-conducting end of the heat exchange tube is connected in series with the interior of the coke oven gas heat exchange channel, the converter gas heat exchange channel, and the blast furnace gas heat exchange channel. The heat exchange tubes are arranged in a linear array of twelve. Fins are installed through the interior of the coke oven gas heat exchange channel, the converter gas heat exchange channel, the blast furnace gas heat exchange channel, and the flue gas heat exchange channel. The fins are arranged in a linear array of twelve. The heat exchange flow direction of the coke oven gas heat exchange channel, the converter gas heat exchange channel, and the blast furnace gas heat exchange channel is reversed from the exhaust inlet of the flue gas heat exchange channel.

[0012] In a preferred embodiment of the multi-media gas heat exchanger and its usage method provided by the present invention, the circulation component includes a flue gas inlet, a flue gas guide block one is fixedly installed on the inner wall of the flue gas heat exchange channel near the flue gas inlet, the two sides of the inside of the flue gas guide block one are bent, a flue gas outlet is opened on the side of the flue gas heat exchange channel away from the flue gas inlet, and a flue gas guide block two is fixedly installed on the side of the inside of the flue gas heat exchange channel near the flue gas outlet, the inner side of the flue gas guide block two is bent.

[0013] In a preferred embodiment of the multi-media gas heat exchanger and its usage method provided by the present invention, auxiliary gas guide blocks are fixedly connected to the outer surfaces of the fin closest to the first flue gas guide block and the two fins closest to the flue gas outlet.

[0014] As a preferred embodiment of the multi-media gas heat exchanger and its usage method provided by the present invention, the fixing device includes an mounting ring and a mounting base. The mounting ring and the mounting base are respectively fixedly installed on the upper and lower sides of the heat exchanger body. The upper surface of the mounting base is provided with a groove that matches the heat exchange tube. Twelve mounting rings are arranged in a linear array on the outer surface of the top side of the heat exchange tube.

[0015] In a preferred embodiment of the multi-media gas heat exchanger and its usage method provided by the present invention, a rotating rod is rotatably connected through the top wall of the heat exchange tube. A rotating push plate is fixedly connected to one end of the rotating rod extending into the heat exchange tube. Fixed plates are slidably connected to the four corners of the outer surface of the rotating push plate. The fixed plates are cross-shaped. A spring is fixedly connected between the fixed plates and the heat exchange tube. The mounting ring and the inner surface of the heat exchange tube are provided with fixing slots that match the fixing plates, and the fixing slots penetrate the mounting ring.

[0016] In a preferred embodiment of the multi-media gas heat exchanger and its usage method provided by the present invention, the rotating rod passes through the heat exchange tube and is fixedly connected to a positioning plate on the upper surface of the heat exchange tube. One end of the surface of the positioning plate is provided with a threaded rod, and the inner surface of the threaded rod is threaded with a threaded rod. The upper surface of the heat exchange tube is provided with two threads that match the threaded rod.

[0017] The method of using a multi-media gas heat exchanger, including the multi-media gas heat exchanger described above, is as follows:

[0018] In operation, 200°C flue gas enters the flue gas heat exchange channel, passes over the surface of the fins, and contacts the hot end of the heat exchange tube for heat exchange. The cold fluid inside the heat exchange tube is heated and evaporated, then flows upwards along the inside of the tube. First, it passes through the blast furnace gas heat exchange channel, where some of the evaporated gas inside the tube is condensed and flows by gravity into the flue gas heat exchange channel. The uncondensed gas continues to rise into the converter gas heat exchange channel. Then, some of the hot gas inside the heat exchange tube is further condensed by the cold converter gas and flows by gravity through the blast furnace gas heat exchange channel to the flue gas heat exchange channel. The uncondensed gas in the heat exchange tube continues to rise into the coke oven gas heat exchange channel. Inside, the cooled coke oven gas continues to condense and then flows by gravity through the converter gas heat exchange channel and the blast furnace gas heat exchange channel before reaching the flue gas heat exchange channel. During this process, the flue gas temperature is reduced, while the blast furnace gas, converter gas, and coke oven gas are heated. Ultimately, the heat from the flue gas is transferred to the three types of gas through the heat exchange fluid phase change in the heat exchange tubes. Because the flue gas exchanges heat with the three types of gas through the heat pipes, even if the volume of any one of the gases fluctuates, as long as the total flow rate remains roughly constant, the overall heat exchange remains unchanged, and the boiler exhaust temperature does not increase. The heat exchange tubes are well-known and will not be explained further here.

[0019] In use, the circulation component includes a flue gas inlet. A flue gas guide block one is fixedly installed on the inner wall of the flue gas heat exchange channel near the flue gas inlet, with both sides of the inside of the flue gas guide block one being curved. A flue gas outlet is opened on the side of the flue gas heat exchange channel away from the flue gas inlet. A second flue gas guide block two is fixedly installed on the inner side of the flue gas heat exchange channel near the flue gas outlet, with the inner side of the second flue gas guide block being curved. Flue gas auxiliary guide blocks are fixedly connected to the outer surfaces of the fin closest to the first flue gas guide block and the two fins closest to the flue gas outlet, respectively.

[0020] Flue gas flows into the interior of the flue gas heat exchange channel from the flue gas inlet. Part of the flue gas flows out from the flue gas outlet, and another part of the flue gas flows to the inner surface of the second flue gas guide block under the action of the flue gas auxiliary guide block installed on the surface of the heat exchange tube near the flue gas outlet. Under the action of the curved setting of the inner surface of the second flue gas guide block, the flue gas flows back to the surface of the first flue gas guide block and flows inside between the heat exchange tubes.

[0021] During the maintenance and replacement of the heat exchange tube, rotate the threaded rod to disengage from thread two, rotate the positioning plate counterclockwise, and drive the rotating push plate fixedly connected to the rotating rod to rotate synchronously. The position of the contact surface between the rotating push plate and the fixed plate changes, so that the fixed plate disengages from the mounting ring and the fixing groove opened in the heat exchange tube under the elastic force of the spring. Rotate the threaded rod in the opposite direction to enter the interior of thread two for fixing, and manually pull out the heat exchange tube for replacement. Conversely, install it.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] This invention utilizes the characteristics of heat pipes, setting up a flue gas heat exchange unit at the hot end of the heat pipe and connecting three gas heat exchange units in series at the cold end of the heat pipe. Even when the flow rates of the three types of gas fluctuate continuously, it can ensure that there are sufficient cooling resources to cool the flue gas, reduce the boiler exhaust temperature, and improve boiler efficiency. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of the multi-media gas heat exchanger and its usage method provided in this application;

[0025] Figure 2 A top sectional view of the multi-media gas heat exchanger and its usage method provided in this application;

[0026] Figure 3 A schematic diagram of the rotating push plate for the multi-media gas heat exchanger and its usage method provided in this application;

[0027] Figure 4 A schematic diagram of the heat exchange tubes for the multi-media gas heat exchanger and its usage method provided in this application;

[0028] Figure 5 A schematic diagram of the mounting base for the multi-media gas heat exchanger and its usage method provided in this application.

[0029] The image shows:

[0030] 1. Heat exchanger body; 11. Mounting ring; 12. Mounting base; 13. Coke oven gas heat exchange channel; 14. Converter gas heat exchange channel; 15. Blast furnace gas heat exchange channel; 2. Fins; 3. Flue gas heat exchange channel; 31. Flue gas inlet; 32. Flue gas guide block one; 33. Flue gas outlet; 34. Flue gas guide block two; 35. Flue gas auxiliary guide block; 4. Heat exchange tube; 41. Rotating rod; 42. Rotating push plate; 43. Fixing plate; 44. Spring; 45. Positioning plate; 46. Thread one; 47. Threaded rod; 48. Thread two. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] As described in the background art, when the boiler is under low load or the proportion of blast furnace gas is low, it is difficult to reduce the temperature to the design value, resulting in excessively high flue gas temperature and energy waste.

[0037] To address this technical problem, the present invention provides a multi-media gas heat exchanger and its usage method.

[0038] For details, please refer to Figure 1-5 The multi-media gas heat exchanger and its usage method specifically include: a heat exchanger body 1 and heat exchange tubes 4. The heat exchanger body 1 is provided with a coke oven gas heat exchange channel 13 for heating and heat exchange of coke oven gas. A converter gas heat exchange channel 14 for heating and heat exchange of converter gas is provided below the coke oven gas heat exchange channel 13. A blast furnace gas heat exchange channel 15 for heating and heat exchange of blast furnace gas is provided below the converter gas heat exchange channel 14. A flue gas heat exchange channel 3 for cooling and heat exchange of flue gas is provided below the blast furnace gas heat exchange channel 15. A circulation component for circulating and guiding part of the flue gas is provided inside the flue gas heat exchange channel 3. Fixing devices are provided at both ends of the heat exchange tubes 4.

[0039] This invention utilizes the characteristics of heat pipes, setting up a flue gas heat exchange unit at the hot end of the heat pipe and connecting three gas heat exchange units in series at the cold end of the heat pipe. Even when the flow rates of the three types of gas fluctuate continuously, it can ensure that there are sufficient cooling resources to cool the flue gas, reduce the boiler exhaust temperature, and improve boiler efficiency.

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0041] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] Example 1

[0044] Please refer to Figure 1-5A multi-media gas heat exchanger and its usage method are disclosed, comprising a heat exchanger body 1 and heat exchange tubes 4. The heat exchanger body 1 is provided with a coke oven gas heat exchange channel 13 for heating and heat exchange of coke oven gas. A converter gas heat exchange channel 14 for heating and heat exchange of converter gas is provided below the coke oven gas heat exchange channel 13. A blast furnace gas heat exchange channel 15 for heating and heat exchange of blast furnace gas is provided below the converter gas heat exchange channel 14. A flue gas heat exchange channel 3 for cooling and heat exchange of flue gas is provided below the blast furnace gas heat exchange channel 15. A circulation component for circulating and guiding part of the flue gas is provided inside the flue gas heat exchange channel 3. Fixing devices are provided at both ends of the heat exchange tubes 4. The heat-absorbing end of the heat exchange tube 4 is located inside the flue gas heat exchange channel 3. The heat-conducting end of the heat exchange tube 4 is connected in series with the interior of the coke oven gas heat exchange channel 13, the converter gas heat exchange channel 14, and the blast furnace gas heat exchange channel 15. There are twelve heat exchange tubes 4 arranged in a linear array. Fins 2 are installed through the interior of the coke oven gas heat exchange channel 13, the converter gas heat exchange channel 14, the blast furnace gas heat exchange channel 15, and the flue gas heat exchange channel 3. There are twelve fins 2 arranged in a linear array. The heat exchange flow direction of the coke oven gas heat exchange channel 13, the converter gas heat exchange channel 14, and the blast furnace gas heat exchange channel 15 is reversed from the exhaust inlet of the flue gas heat exchange channel 3.

[0045] Implementation process: Flue gas at approximately 200℃ enters the flue gas heat exchange channel 3, passes through the surface of fins 2, and contacts the hot end of the heat exchange tube 4 for heat exchange. The cold fluid inside the heat exchange tube 4 is heated and evaporated, then flows upward along the inside of the heat exchange tube 4. First, it passes through the blast furnace gas heat exchange channel 15, where some of the evaporated gas inside the heat exchange tube 4 is condensed and flows by gravity to the flue gas heat exchange channel 3. The gas that is not condensed continues to rise to the converter gas heat exchange channel 14. Then, some of the hot gas inside the heat exchange tube 4 continues to be condensed by the cold converter gas. After flowing by gravity through the blast furnace gas heat exchange channel 15, it reaches the flue gas heat exchange channel 3. The gas that is still not condensed in the heat exchange tube 4 continues to rise to the coke oven gas heat exchange channel 14. Inside the gas heat exchange channel 13, the cooled coke oven gas continues to condense and then flows by gravity through the converter gas heat exchange channel 14 and the blast furnace gas heat exchange channel 15 before reaching the flue gas heat exchange channel 3. During this process, the flue gas temperature is reduced, while the blast furnace gas, converter gas, and coke oven gas are heated. Ultimately, the heat from the flue gas is transferred to the three types of gas through the heat exchange fluid phase change in the heat exchange tube 4. Because the flue gas exchanges heat with the three types of gas through the heat pipe, as long as the total flow rate remains approximately constant, the overall heat exchange remains unchanged and the boiler exhaust temperature does not increase, even if the flow rate of any one of the gases fluctuates. The heat exchange tube 4 is a well-known technology and will not be explained further here.

[0046] Benefits of implementation: Ensures sufficient cooling resources to cool the flue gas, reduces boiler exhaust temperature, and improves boiler efficiency.

[0047] Example 2

[0048] The circulation component includes a flue gas inlet 31. A flue gas guide block 32 is fixedly installed on the inner wall of the flue gas heat exchange channel 3 near the flue gas inlet 31. The two sides of the flue gas guide block 32 are curved. A flue gas outlet 33 is opened on the side of the flue gas heat exchange channel 3 away from the flue gas inlet 31. A second flue gas guide block 34 is fixedly installed on the inner side of the flue gas heat exchange channel 3 near the flue gas outlet 33. The inner side of the second flue gas guide block 34 is curved. Flue gas auxiliary guide blocks 35 are fixedly connected to the outer surfaces of the fin 2 closest to the first flue gas guide block 32 and the two fins 2 closest to the flue gas outlet 33, respectively.

[0049] Implementation process: Flue gas flows into the interior of flue gas heat exchange channel 3 from flue gas inlet 31. Part of the flue gas flows out from flue gas outlet 33, and another part of the flue gas flows to the inner surface of flue gas guide block 2 34 under the action of flue gas auxiliary guide block 35 installed on the surface of heat exchange tube 4 near flue gas outlet 33. Under the action of the curved setting of the inner surface of flue gas guide block 2 34, the flue gas flows back to the surface of flue gas guide block 1 32 and flows inside between heat exchange tubes 4.

[0050] Benefits of implementation: It enables some of the flue gas to circulate and be reused internally, reducing the loss and waste of flue gas heat.

[0051] Example 3

[0052] The fixing device includes a mounting ring 11 and a mounting base 12. The mounting ring 11 and the mounting base 12 are respectively fixedly installed on the upper and lower sides of the heat exchanger body 1. The upper surface of the mounting base 12 is provided with a groove that matches the heat exchange tube 4. Twelve mounting rings 11 are arranged in a linear array on the outer surface of the top side of the heat exchange tube 4. A rotating rod 41 is rotatably connected through the inner top wall of the heat exchange tube 4. A rotating push plate 42 is fixedly connected to one end of the rotating rod 41 that extends into the interior of the heat exchange tube 4. Fixed plates 43 are slidably connected to the four corners of the outer surface of the rotating push plate 42. The fixed plates 43 are cross-shaped. A spring 44 is fixedly connected between the fixed plates 43 and the heat exchange tube 4. The inner surfaces of the mounting ring 11 and the heat exchange tube 4 are provided with fixing slots that match the fixing plates 43, and the fixing slots are opened through the mounting ring 11. The rotating rod 41 passes through the heat exchange tube 4 and is fixedly connected to the positioning plate 45 on the upper surface of the heat exchange tube 4. One end of the surface of the positioning plate 45 is provided with a thread 46, and the inner surface of the thread 46 is threaded with a threaded rod 47. The upper surface of the heat exchange tube 4 is provided with two threads 48 that match the threaded rod 47.

[0053] Implementation process: During the maintenance and replacement of heat exchange tube 4, rotate threaded rod 47 to disengage from thread 48, rotate positioning plate 45 counterclockwise, and drive rotating push plate 42, which is fixedly connected to rotating rod 41, to rotate synchronously. The position of the contact surface between rotating push plate 42 and fixed plate 43 changes, so that fixed plate 43 is disengaged from the mounting ring 11 and the fixing groove opened in heat exchange tube 4 under the elastic force of spring 44. Rotate threaded rod 47 in the opposite direction to enter the interior of thread 48 for fixing. Manually pull out heat exchange tube 4 for replacement, and then install it in the opposite direction.

[0054] Benefits of implementation: Facilitates the maintenance and replacement of heat exchange tube 4.

[0055] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A multi-media gas heat exchanger, comprising a heat exchanger body (1) and heat exchange tubes (4), characterized in that, The heat exchanger body (1) is provided with a coke oven gas heat exchange channel (13) for heating and exchanging heat for coke oven gas. A converter gas heat exchange channel (14) for heating and exchanging heat for converter gas is provided on the lower side of the coke oven gas heat exchange channel (13). A blast furnace gas heat exchange channel (15) for heating and exchanging heat for blast furnace gas is provided on the lower side of the converter gas heat exchange channel (14). A flue gas heat exchange channel (3) for cooling and exchanging heat for flue gas is provided on the lower side of the blast furnace gas heat exchange channel (15). A circulation component for circulating and guiding part of the flue gas is provided inside the flue gas heat exchange channel (3). Fixing devices are provided at both ends of the heat exchange tube (4). The fixing device includes a mounting ring (11) and a mounting base (12). The mounting ring (11) and the mounting base (12) are respectively fixedly installed on the upper and lower sides of the heat exchanger body (1). The upper surface of the mounting base (12) is provided with a groove that matches the heat exchange tube (4). Twelve mounting rings (11) are arranged in a linear array on the outer surface of the top side of the heat exchange tube (4). A rotating rod (41) is rotatably connected through the inner top wall of the heat exchange tube (4). A rotating push plate (42) is fixedly connected to one end of the rotating rod (41) extending into the interior of the heat exchange tube (4). Fixed plates (43) are slidably connected to the four corners of the outer surface of the rotating push plate (42). The fixed plates (43) are cross-shaped. A spring (44) is fixedly connected between the fixed plates (43) and the heat exchange tube (4). The inner surface of the mounting ring (11) and the heat exchange tube (4) is provided with a fixing slot that matches the fixing plate (43), and the fixing slot is opened through the mounting ring (11). The rotating rod (41) passes through the heat exchange tube (4) and is fixedly connected to the positioning plate (45) on the upper surface of the heat exchange tube (4). One end of the surface of the positioning plate (45) is provided with a thread (46). The inner surface of the thread (46) is threaded with a threaded rod (47). The upper surface of the heat exchange tube (4) is provided with two threads (48) that match the threaded rod (47).

2. The multi-media gas heat exchanger according to claim 1, characterized in that, The heat-absorbing end of the heat exchange tube (4) is located inside the flue gas heat exchange channel (3). The heat-conducting end of the heat exchange tube (4) is connected in series with the interior of the coke oven gas heat exchange channel (13), the converter gas heat exchange channel (14), and the blast furnace gas heat exchange channel (15). There are twelve heat exchange tubes (4) arranged in a linear array. Fins (2) are installed through the interior of the coke oven gas heat exchange channel (13), the converter gas heat exchange channel (14), the blast furnace gas heat exchange channel (15), and the flue gas heat exchange channel (3). There are twelve fins (2) arranged in a linear array. The heat exchange flow direction of the coke oven gas heat exchange channel (13), the converter gas heat exchange channel (14), and the blast furnace gas heat exchange channel (15) is reversed from the exhaust inlet of the flue gas heat exchange channel (3).

3. The multi-media gas heat exchanger according to claim 2, characterized in that, The circulation component includes a flue gas inlet (31), a flue gas guide block one (32) is fixedly installed on the inner wall of the flue gas heat exchange channel (3) near the flue gas inlet (31), the two sides of the flue gas guide block one (32) are bent, a flue gas outlet (33) is opened on the side of the flue gas heat exchange channel (3) away from the flue gas inlet (31), a flue gas guide block two (34) is fixedly installed on the side of the flue gas heat exchange channel (3) near the flue gas outlet (33), the inner side of the flue gas guide block two (34) is bent.

4. The multi-media gas heat exchanger according to claim 3, characterized in that, The outer surfaces of the fin (2) closest to the first flue gas guide block (32) and the two fins (2) closest to the flue gas outlet (33) are respectively fixedly connected to auxiliary flue gas guide blocks (35).

5. The method of using a multi-media gas heat exchanger, characterized in that: The multi-media gas heat exchanger as described in claim 1 is operated as follows: In use, flue gas at 200°C enters the flue gas heat exchange channel (3), passes the surface of the fins (2), and contacts the hot end of the heat exchange tube (4) for heat exchange. The cold fluid inside the heat exchange tube (4) is heated and evaporated, and then flows upward along the inside of the heat exchange tube (4). First, it passes through the blast furnace gas heat exchange channel (15), causing some of the evaporated gas inside the heat exchange tube (4) to be condensed and flow by gravity to the flue gas heat exchange channel (3). The gas that is not condensed continues to rise to the converter gas heat exchange channel (14). Then, some of the hot gas inside the heat exchange tube (4) continues to be condensed by the cold converter gas. After flowing by gravity through the blast furnace gas heat exchange channel (15), it reaches the flue gas heat exchange channel (3). The gas in the heat exchange tube (4) then flows upward according to the temperature of the blast furnace gas heat exchange channel (15). The gas that has not been condensed continues to rise into the coke oven gas heat exchange channel (13). After the coke oven gas that has been cooled continues to condense, it flows by gravity through the converter gas heat exchange channel (14) and the blast furnace gas heat exchange channel (15) in sequence to the flue gas heat exchange channel (3). During the above process, the flue gas temperature is reduced, and the blast furnace gas, converter gas and coke oven gas are heated. Finally, the heat of the flue gas is transferred to the three types of gas through the heat exchange fluid phase change in the heat exchange tube (4). Since the flue gas exchanges heat with the three types of gas through the heat pipe, when the amount of any of the gas flues, as long as the total flow rate remains roughly unchanged, the total heat exchange can remain unchanged and the boiler exhaust temperature will not increase. In use, the circulation component includes a flue gas inlet (31), a flue gas guide block one (32) is fixedly installed on the inner wall of the flue gas heat exchange channel (3) near the flue gas inlet (31), the two sides inside the flue gas guide block one (32) are bent, a flue gas outlet (33) is opened on the side of the flue gas heat exchange channel (3) away from the flue gas inlet (31), a flue gas guide block two (34) is fixedly installed on the inner side of the flue gas heat exchange channel (3) near the flue gas outlet (33), the inner side of the flue gas guide block two (34) is bent, and the outer surfaces of the fin (2) closest to the flue gas guide block one (32) and the two fins (2) closest to the flue gas outlet (33) are respectively fixedly connected to the flue gas auxiliary guide blocks (35). Flue gas flows into the interior of the flue gas heat exchange channel (3) from the flue gas inlet (31). Part of the flue gas flows out from the flue gas outlet (33), and another part of the flue gas flows to the inner surface of the second flue gas guide block (34) under the action of the flue gas auxiliary guide block (35) installed on the surface of the heat exchange tube (4) near the flue gas outlet (33). Under the action of the curved setting of the inner surface of the second flue gas guide block (34), the flue gas flows back to the surface of the first flue gas guide block (32) and flows inside between the heat exchange tubes (4). During the maintenance and replacement of the heat exchange tube (4), rotate the threaded rod (47) to disengage from the second thread (48), rotate the positioning plate (45) counterclockwise, and drive the rotating push plate (42) fixedly connected to the rotating rod (41) to rotate synchronously. The position of the contact surface between the rotating push plate (42) and the fixed plate (43) changes, so that the fixed plate (43) is disengaged from the mounting ring (11) and the fixed groove opened in the heat exchange tube (4) under the elastic force of the spring (44). Rotate the threaded rod (47) in the opposite direction to enter the interior of the second thread (48) for fixing. Manually pull out the heat exchange tube (4) for replacement, and then install it.

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