Waste heat recovery system

Abstract

The utility model relates to the technical field of composite materials, in particular to a waste heat recovery system.The waste heat recovery system comprises a machining device, a waste gas treatment device and a heat exchange device, and the machining device is used for machining raw materials; the waste gas treatment device is communicated with the processing device through at least one first gas conveying pipeline, and the first gas conveying pipeline is used for conveying waste gas generated by the processing device to the waste gas treatment device; the heat exchange device comprises a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path exchanges heat with the waste gas treatment device through a heat exchange pipeline, and the second heat exchange flow path communicates with the machining device through a second gas conveying pipeline. By means of the design, gas in the heating device exchanges heat with the first heat exchange flow path through the second heat exchange flow path and then enters the machining device through the second gas conveying pipeline, heating of the gas in the machining device is avoided, energy is saved, and machining cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite materials, and in particular to a waste heat recovery system. BACKGROUND

[0002] The carbonization process in the carbon fiber manufacturing process is to heat the pre-oxidized fiber in an inert gas to remove non-carbon elements in the fiber, so that the physical and chemical properties of the carbon fiber are significantly improved. Hydrogen cyanide, carbon monoxide, ammonia and other waste gases are generated in the carbonization process, and a large amount of heat is generated when the waste gas is treated.

[0003] At present, there is no waste heat recovery system that can recover the heat generated in the waste gas treatment process for reuse in the production and processing process, resulting in waste of processing cost. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems, the present application provides a waste heat recovery system which saves energy and processing cost.

[0005] According to some embodiments, the present application provides a waste heat recovery system, which comprises:

[0006] a processing device for processing raw materials;

[0007] a waste gas treatment device in communication with the processing device through at least one first gas conveying pipeline for conveying waste gas generated by the processing device to the waste gas treatment device;

[0008] a heat exchange device comprising a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path being in heat exchange with the waste gas treatment device through a heat exchange pipeline, and the second heat exchange flow path being in communication with the processing device through a second gas conveying pipeline.

[0009] In some embodiments of the present application, the gas in the second gas conveying pipeline is nitrogen or inert gas, and the second gas conveying pipeline is used to convey the heated nitrogen or inert gas in the heat exchange device to the processing device.

[0010] In some embodiments of the present application, the processing device comprises a low-temperature furnace and a high-temperature furnace, and the low-temperature furnace and the high-temperature furnace are respectively in communication with the waste gas treatment device through one of the first gas conveying pipelines, and the first gas conveying pipeline is used to convey the waste gas generated by the low-temperature furnace and the high-temperature furnace to the waste gas treatment device.

[0011] In some embodiments of the present application, the waste heat recovery system further comprises a first heating device and a second heating device, the low-temperature furnace is communicated with the second gas conveying pipeline through a first branch pipeline, the first heating device is arranged on the first branch pipeline, the high-temperature furnace is communicated with the second gas conveying pipeline through a second branch pipeline, and the second heating device is arranged on the second branch pipeline.

[0012] In some embodiments of the present application, the heat exchange pipeline comprises a steam pipeline and a condensate water pipeline, a drain valve is arranged on the condensate water pipeline,

[0013] The first heat exchange flow path comprises a coil pipe arranged inside the heat exchange device, an inlet of the coil pipe is communicated with the steam pipeline, an outlet of the coil pipe is communicated with the condensate water pipeline, and the exhaust treatment device introduces water vapor into the coil pipe through the steam pipeline, and the water vapor is liquefied into condensate water in the coil pipe and then flows back to the exhaust treatment device through the condensate water pipeline.

[0014] In some embodiments of the present application, in the vertical direction, the condensate water pipeline is arranged below the steam pipeline, and the outlet of the coil pipe is arranged below the inlet of the coil pipe.

[0015] In some embodiments of the present application, the waste heat recovery system further comprises an oxidation furnace, the oxidation furnace is communicated with the heat exchange device through a third gas conveying pipeline, and the third gas conveying pipeline is used for conveying the air heated by the heat exchange device to the oxidation furnace.

[0016] In some embodiments of the present application, a first temperature sensor is arranged in the second gas conveying pipeline, a second temperature sensor is arranged in the third gas conveying pipeline, and a valve is arranged on the steam pipeline, and the first temperature sensor, the second temperature sensor and the valve are electrically connected with a controller.

[0017] In some embodiments of the present application, at least one inlet is arranged on the heat exchange device, and the gas to be heated enters the heat exchange device through the inlet.

[0018] In some embodiments of the present application, the waste heat recovery system further comprises a natural gas storage device, and the natural gas storage device is communicated with the exhaust treatment device through a fourth gas conveying pipeline.

[0019] The waste heat recovery system provided by the present application can achieve the following beneficial technical effects:

[0020] The waste heat recovery system provided in the application is provided with a waste gas treatment device communicated with the processing device through a first gas conveying pipeline to treat the waste gas generated in the processing process of the processing device, the heat generated in the treatment process is conveyed to the first heat exchange flow path of a heat exchange device through a heat exchange pipeline, the second heat exchange flow path in the heat exchange device includes the substance to be heated, the heat exchange between the first heat exchange flow path and the second heat exchange flow path and the conveying of the heated substance to the processing device through a second gas conveying pipeline for utilization avoid the waste of energy caused by the heating of the substance in the processing device and save the processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings incorporated into the specification and constituting a part of the specification show the embodiments of the application and, together with the description, serve to explain the principles of the application. In these drawings, similar reference numerals are used to represent similar elements. The drawings in the following description are some embodiments of the application, not all embodiments. For those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0022] Figure 1 is a structural schematic view of a waste heat recovery system according to an embodiment of the application.

[0023] Reference numerals:

[0024] 110, low-temperature furnace; 120, high-temperature furnace;

[0025] 210, first gas conveying pipeline; 220, second gas conveying pipeline; 2210, first branch pipeline; 2220, second branch pipeline; 230, heat exchange pipeline; 2310, steam pipeline; 2311, valve; 2320, condensate pipeline; 2321, trap; 240, third gas conveying pipeline; 250, fourth gas conveying pipeline;

[0026] 300, waste gas treatment device;

[0027] 400, heat exchange device; 410, coil;

[0028] 510, first heating device; 520, second heating device;

[0029] 600, oxidation furnace; 700, natural gas storage device. DETAILED DESCRIPTION

[0030] To make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in any manner without conflict.

[0031] The carbonization process in the carbon fiber manufacturing process is to heat the pre-oxidized fiber in an inert gas to remove non-carbon elements in the fiber, so that the physical and chemical properties of the carbon fiber are significantly improved. The carbonization process consumes a large amount of electric energy. Hydrogen cyanide, carbon monoxide, ammonia, and other waste gases are generated in the carbonization process. A large amount of heat is generated when the waste gas is treated. Currently, this heat is only recovered for tow drying and heating. Most of the heat cannot be used and can only be discharged into the air, causing waste of energy. There is currently no waste heat recovery system that can recover the heat generated during waste gas treatment for reuse in the production process, which also increases the processing cost.

[0032] To solve the above problems, the present application provides a waste heat recovery system. The waste heat recovery system is provided with a waste gas treatment device in communication with a processing device through a first gas conveying pipeline. The waste heat recovery system processes the waste gas generated in the processing process of the processing device. The heat generated in the processing process is conveyed to the first heat exchange flow path of a heat exchange device through a heat exchange pipeline. The second heat exchange flow path of the heat exchange device includes a substance to be heated. The first heat exchange flow path and the second heat exchange flow path exchange heat, and the heated substance is conveyed to the processing device through a second gas conveying pipeline for use. The waste heat recovery system avoids the waste of energy caused by heating the substance in the processing device and saves the processing cost.

[0033] The waste heat recovery system provided by the present application will be described in detail below with reference to the accompanying drawings.

[0034] An exemplary embodiment of the present application provides a waste heat recovery system, as shown in Figure 1 The waste heat recovery system includes a processing device, a waste gas treatment device 300, and a heat exchange device 400. The processing device is used to complete the production process, i.e., to process raw materials. The waste gas generated in the processing process of the processing device is conveyed to the waste gas treatment device 300 through a first gas conveying pipeline 210. The heat exchange device 400 includes at least a first heat exchange flow path and a second heat exchange flow path. The first heat exchange flow path is in communication with a heat exchange pipeline 230 and exchanges heat with the waste gas treatment device 300 through the heat exchange pipeline 230. The second heat exchange flow path is in communication with the processing device through a second gas conveying pipeline 220.

[0035] The waste heat recovery process of the waste heat recovery system in this embodiment is as follows:

[0036] The waste gas generated during the processing of the processing device is transported to the waste gas treatment device 300 through the first gas conveying pipe 210. The waste gas treatment device 300 treats the waste gas, and the heat generated during the treatment is transferred to the first heat exchange flow path of the heat exchange device 400 through the heat exchange pipe 230. The material to be heated is passed into the second heat exchange flow path of the heat exchange device 400 and completes heat exchange with the first heat exchange flow path. The heated material is then passed into the processing device through the second gas conveying pipe 220 for utilization, thus realizing the recovery of waste heat.

[0037] By setting up a waste gas treatment device 300 connected to the processing device through a first gas conveying pipe 210, the waste gas generated during the processing of the processing device is treated. The heat generated during the treatment is transported to the first heat exchange flow path of the heat exchange device 400 through a heat exchange pipe 230. The second heat exchange flow path in the heat exchange device 400 includes the substance to be heated. Heat is exchanged between the first heat exchange flow path and the second heat exchange flow path, and the heated substance is transported to the processing device through a second gas conveying pipe 220 for utilization. This avoids the waste of energy caused by heating the substance in the processing device and saves processing costs.

[0038] In this embodiment, the waste gas treatment device 300 is, for example, a multi-stage incinerator. The multi-stage incinerator uses a multi-stage combustion process to cause the waste gas to undergo chemical reactions of oxidation, reduction, and re-oxidation, generating harmless substances and releasing heat. The waste gas treatment device 300 can also be other equipment, which is not limited here.

[0039] In some embodiments, such as Figure 1 As shown, the gas in the second gas delivery pipeline 220 is nitrogen or an inert gas. That is, the nitrogen or inert gas, heated by the heat exchanger 400, is delivered to the processing device through the second gas delivery pipeline 220. Examples of inert gases include argon and helium. Introducing an inert gas into the processing device ensures environmental stability during processing. By introducing heated gas into the processing device, heating the gas within the processing device is avoided, thus preventing waste of processing costs.

[0040] In some embodiments, such as Figure 1 As shown, the processing device includes a low-temperature furnace 110 and a high-temperature furnace 120. The low-temperature furnace 110 is connected to the waste gas treatment device 300 through a first gas conveying pipe 210, and the high-temperature furnace 120 is connected to the waste gas treatment device 300 through another first gas conveying pipe 210. The waste gas generated by the low-temperature furnace 110 and the high-temperature furnace 120 is respectively conveyed to the waste gas treatment device 300 through the first gas conveying pipe 210.

[0041] In the embodiment, the low-temperature furnace 110 and the high-temperature furnace 120 are arranged, the pre-oxidized fiber is subjected to low-temperature carbonization by the low-temperature furnace 110 to remove most of the non-carbon atoms, and then the carbonized fiber is subjected to high-temperature carbonization treatment by the high-temperature furnace 120, so that the fiber is further carbonized to form a graphite turbostratic structure, thereby ensuring the strength of the fiber. It should be noted that in the embodiment, the processing device is arranged for the manufacture of carbon fiber by arranging the high-temperature furnace 120 and the low-temperature furnace 110. In other embodiments, the processing device can also be arranged to include other devices for processing other products, which are all within the protection scope of the present application.

[0042] In some embodiments, with continued reference to Figure 1 , the waste heat recovery system further comprises a first heating device 510 and a second heating device 520. The second gas conveying pipeline 220 is communicated with the low-temperature furnace 110 through a first branch pipeline 2210, and the first heating device 510 is arranged on the first branch pipeline 2210. The first heating device 510 is used for secondarily heating the gas conveyed by the first branch pipeline 2210, and then the gas is introduced into the low-temperature furnace 110 for use. The high-temperature furnace 120 is communicated with the second gas conveying pipeline 220 through a second branch pipeline 2220, and the second heating device 520 is arranged on the second branch pipeline 2220. The second heating device 520 is used for secondarily heating the gas conveyed by the second branch pipeline 2220, and then the gas is introduced into the high-temperature furnace 120 for use.

[0043] Since the heating degree of the heat exchange device 400 is limited, it may not be able to reach the required temperature in the high-temperature furnace 120 and the low-temperature furnace 110. Therefore, the first heating device 510 and the second heating device 520 for secondary heating are arranged to ensure that the temperature of the gas introduced into the processing device reaches the requirement.

[0044] In some embodiments, with continued reference to Figure 1 , the heat exchange pipeline 230 comprises a steam pipeline 2310 and a condensed water pipeline 2320, and a drain valve 2321 is arranged on the condensed water pipeline 2320. The first heat exchange flow path comprises a coil 410 arranged inside the heat exchange device 400 and having an inlet communicated with the steam pipeline 2310. The outlet of the coil 410 is communicated with the condensed water pipeline 2320. The waste gas treatment device 300 is provided with a water tank, for example, which is communicated with the steam pipeline 2310 and the condensed water pipeline 2320. The water in the water tank is heated and vaporized into water vapor, which is introduced into the coil 410 through the steam pipeline 2310. The water vapor is liquefied into condensed water after heat exchange with the substance in the second heat exchange flow path in the coil 410, and then flows back to the water tank of the waste gas treatment device 300 through the condensed water pipeline 2320, thereby forming a circulation loop.

[0045] With this design, water can be recycled as a heat exchange medium, saving costs; the steam trap 2321 ensures that water in the coil 410 is extracted from the coil 410 in a timely manner, and the steam trap 2321 can prevent steam leakage and drain water, avoiding steam leakage and heat loss.

[0046] In other embodiments, the heating medium in the heat exchange pipe 230 may be other substances, such as heat transfer oil. Those skilled in the art can make the settings according to actual needs, which will not be elaborated here.

[0047] In some embodiments, continue to refer to Figure 1 In the vertical direction, the condensate pipe 2320 is located below the steam pipe 2310, and the outlet of the coil 410 is located below the inlet of the coil 410. This design allows the condensate liquefied in the coil 410 to flow to the bottom of the coil 410 under gravity, facilitating timely discharge from the coil 410 by the steam trap 2321, thus ensuring the heating efficiency of the heat exchanger 400.

[0048] In some embodiments, such as Figure 1 As shown, the waste heat recovery system also includes an oxidizer 600, which is connected to the heat exchanger 400 via a third gas delivery pipe 240. The third gas delivery pipe 240 is used to deliver the air heated by the heat exchanger 400 to the oxidizer 600.

[0049] The oxidation furnace 600 is mainly used in the oxidation process of carbon fiber production. Through oxidation reaction under high temperature and high pressure, carbon fiber becomes stronger and less prone to breakage. By setting up a third gas delivery pipe 240 connecting the heat exchange device 400 and the oxidation furnace 600, heated air is delivered to the oxidation furnace 600, ensuring the stability of the oxidation environment and saving energy.

[0050] In some embodiments, such as Figure 1 As shown, both the second gas transmission pipeline 220 and the third gas transmission pipeline 240 are insulated to reduce heat loss during gas transmission. Insulation treatments include, for example, covering the outer surface of the pipeline with insulation material, or installing a sleeve on the outer surface of the pipeline and filling it with insulation material.

[0051] In some embodiments, such as Figure 1 As shown, a first temperature sensor is installed in the second gas delivery pipeline 220, a second temperature sensor is installed in the third gas delivery pipeline 240, and a valve 2311 is installed on the steam pipeline 2310. The first temperature sensor, the second temperature sensor, and the valve 2311 are all electrically connected to the controller.

[0052] The first temperature sensor can detect the temperature of the gas in the second gas conveying pipeline 220 in real time, and the second temperature sensor can detect the temperature of the gas in the third gas conveying pipeline 240 in real time. The detection results are sent to the controller. The controller controls the opening and closing degree of the valve 2311 by comparing the real-time temperature and the target temperature, thereby regulating the inlet pressure of the steam, and finally realizing the timely adjustment of the gas temperature in the second gas conveying pipeline 220 and the third gas conveying pipeline 240.

[0053] In some embodiments, as shown in FIG. 4, the heat exchange device 400 is provided with at least one inlet. The gas to be heated enters the heat exchange device 400 through the inlet. That is, the heat exchange device 400 further comprises a third heat exchange flow path. One of the inlets is in communication with the second heat exchange flow path, and the other inlet is in communication with the third heat exchange flow path. Figure 1

[0054] In some embodiments, the second heat exchange flow path and the third heat exchange flow path are provided as pipelines extending in the heat exchange device 400. The pipelines are made of materials with good heat conduction performance, such as metal materials.

[0055] In some embodiments, as shown in FIG. 4, the heat exchange device 400 is provided with at least one inlet. The gas to be heated enters the heat exchange device 400 through the inlet. That is, the heat exchange device 400 further comprises a third heat exchange flow path. One of the inlets is in communication with the second heat exchange flow path, and the other inlet is in communication with the third heat exchange flow path. Figure 1

[0056] In some embodiments, a partition can be provided in the heat exchange device 400. The direction of the partition is perpendicular to the extension direction of the coil 410. The heat exchange device 400 is divided into two non-communicating parts. Two kinds of gas enter the two parts of the heat exchange device 400 through two inlets. In this way, two kinds of gas to be heated can be simultaneously introduced into the heat exchange device 400 for heating.

[0057] The process of using the above-mentioned waste heat recovery system for waste heat recovery is as follows:

[0058] The exhaust gas generated by the high-temperature furnace 120 and the low-temperature furnace 110 during the processing process is conveyed to the exhaust gas treatment device 300 through a first gas conveying pipeline 210. The exhaust gas is treated by the exhaust gas treatment device 300. The heat generated during the treatment process heats the water tank in the exhaust gas treatment device 300. The water vaporizes into steam during the heating process and enters the coil 410 of the heat exchange device 400 through a steam pipeline 2310.

[0059] ​​The substance to be heated is introduced into the second heat exchange flow path of the heat exchange device 400, and exchanges heat with the water vapor in the coil 410, and the water vapor is liquefied into water and flows back to the water tank of the waste gas treatment device 300 through the condensate water pipeline 2320 under the action of the drain valve 2321, and is heated again to be vaporized into water vapor for recycling; and the heated substance is introduced into the first heating device 510 and the second heating device 520 through the second gas conveying pipeline 220, and is conveyed to the low-temperature furnace 110 and the high-temperature furnace 120 for gas sealing after being heated twice. The opening and closing of the through-hole control valve 2311 adjusts the steam pressure in the steam pipeline 2310 to adjust the temperature of the gas in the second gas conveying pipeline 220 and the third gas conveying pipeline 240.

[0060] The waste heat recovery system provided in the application sets the waste gas treatment device 300 in communication with the processing device through the first gas conveying pipeline 210, processes the waste gas generated in the processing process of the processing device, and conveys the heat generated in the processing process to the first heat exchange flow path of the heat exchange device 400 through the heat exchange pipeline 230, while the second heat exchange flow path of the heat exchange device 400 includes the substance to be heated, exchanges heat through the first heat exchange flow path and the second heat exchange flow path, and conveys the heated substance to the processing device through the second gas conveying pipeline 220 for use, thereby avoiding the waste of energy caused by heating the substance in the processing device, saving the processing cost, and ensuring the safety and stability of the system.

[0061] The above-described content can be implemented alone or in various combinations, and these variants are within the protection scope of the application.

[0062] It should be noted that in the description of the application, the terms "upper", "lower", "front", "back", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0063] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0064] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0065] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in the present specification and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0066] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A waste heat recovery system, characterized in that, include: A processing device for processing raw materials; An exhaust gas treatment device, wherein the exhaust gas treatment device is connected to the processing device via at least one first gas conveying pipeline, the first gas conveying pipeline being used to convey the exhaust gas generated by the processing device to the exhaust gas treatment device. A heat exchange device, comprising a first heat exchange flow path and a second heat exchange flow path, wherein the first heat exchange flow path exchanges heat with the waste gas treatment device through a heat exchange pipe, and the second heat exchange flow path is connected to the processing device through a second gas conveying pipe.

2. The waste heat recovery system according to claim 1, characterized in that, The gas in the second gas delivery pipeline is nitrogen or an inert gas, and the second gas delivery pipeline is used to deliver the nitrogen or inert gas heated by the heat exchange device to the processing device.

3. The waste heat recovery system according to claim 1, characterized in that, The processing device includes a low-temperature furnace and a high-temperature furnace. The low-temperature furnace and the high-temperature furnace are respectively connected to the waste gas treatment device through a first gas conveying pipeline. The first gas conveying pipeline is used to convey the waste gas generated by the low-temperature furnace and the high-temperature furnace to the waste gas treatment device.

4. The waste heat recovery system according to claim 3, characterized in that, The waste heat recovery system also includes a first heating device and a second heating device. The low-temperature furnace is connected to the second gas conveying pipeline through a first branch pipeline, and the first heating device is installed on the first branch pipeline. The high-temperature furnace is connected to the second gas conveying pipeline through a second branch pipeline, and the second heating device is installed on the second branch pipeline.

5. The waste heat recovery system according to claim 1, characterized in that, The heat exchange pipeline includes a steam pipeline and a condensate pipeline, and a steam trap is installed on the condensate pipeline. The first heat exchange flow path includes a coil, which is disposed inside the heat exchange device. The inlet of the coil is connected to the steam pipe, and the outlet of the coil is connected to the condensate pipe. The waste gas treatment device introduces water vapor into the coil through the steam pipe. The water vapor liquefies into condensate in the coil and then flows back to the waste gas treatment device through the condensate pipe.

6. The waste heat recovery system according to claim 5, characterized in that, In the vertical direction, the condensate pipe is located below the steam pipe, and the outlet of the coil is located below the inlet of the coil.

7. The waste heat recovery system according to claim 5, characterized in that, The waste heat recovery system also includes an oxidation furnace, which is connected to the heat exchange device via a third gas delivery pipeline. The third gas delivery pipeline is used to deliver the air heated by the heat exchange device to the oxidation furnace.

8. The waste heat recovery system according to claim 7, characterized in that, A first temperature sensor is installed in the second gas delivery pipeline, a second temperature sensor is installed in the third gas delivery pipeline, and a valve is installed on the steam pipeline. The first temperature sensor, the second temperature sensor, and the valve are all electrically connected to the controller.

9. The waste heat recovery system according to any one of claims 1-8, characterized in that, The heat exchange device has at least one inlet, through which the gas to be heated enters the heat exchange device.

10. The waste heat recovery system according to any one of claims 1-8, characterized in that, The waste heat recovery system also includes a natural gas storage device, which is connected to the waste gas treatment device via a fourth gas transmission pipeline.

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