Waste heat recovery system for temperature swing adsorption

Abstract

The utility model discloses a waste heat recovery system for temperature swing adsorption, which belongs to the technical field of waste heat recovery and comprises a heating furnace provided with a waste gas outlet. The heat exchanger is provided with a heat exchange inlet and a heat exchange outlet, and the heat exchange inlet communicates with the waste gas outlet; the adsorption tower is provided with a hot air inlet which is communicated with the heat exchange outlet; and the flexible compensation assembly is arranged between the heating furnace and the heat exchanger, the flexible compensation assembly is suitable for communicating the waste gas outlet with the heat exchange inlet, the flexible compensation assembly is suitable for reducing the pressure of airflow entering the heat exchange inlet, and part of the flexible compensation assembly selectively deforms in the axial direction to compensate pressure changes caused by thermal expansion and cold contraction of the airflow. According to the waste heat recovery system designed by the utility model, the impact of airflow on the heat exchanger is reduced, the service life of the heat exchanger is prolonged, meanwhile, the phenomenon of interface leakage caused by metal fatigue under a thermal cycle working condition is reduced, the air tightness of the system is ensured, and the utilization rate of waste heat is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of waste heat recovery, and particularly relates to a waste heat recovery system for temperature swing adsorption. BACKGROUND

[0002] In the related art, a heating furnace and other equipment generate a large amount of high-temperature exhaust gas, which is usually directly discharged into the atmosphere, resulting in a great waste of energy and a negative impact on the environment. In the prior art, a pipeline is used to connect the exhaust gas outlet of the heating furnace with the heat exchange inlet of a heat exchanger, and the heat exchanger is used to realize waste heat utilization. However, in actual application, metal fatigue occurs under heat cycle conditions, causing leakage at the connection between the pipeline and the exhaust gas outlet, and leakage at the connection between the pipeline and the heat exchange inlet. SUMMARY

[0003] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, one object of the utility model is to provide a waste heat recovery system for temperature swing adsorption.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] The utility model provides a waste heat recovery system for temperature swing adsorption, comprising: a heating furnace, wherein the heating furnace is provided with an exhaust gas outlet; a heat exchanger, wherein the heat exchanger is provided with a heat exchange inlet and a heat exchange outlet, and the heat exchange inlet is in communication with the exhaust gas outlet; an adsorption tower, wherein the adsorption tower is provided with a hot gas inlet, and the hot gas inlet is in communication with the heat exchange outlet; and a flexible compensation assembly, wherein the flexible compensation assembly is arranged between the heating furnace and the heat exchanger, the flexible compensation assembly is adapted to connect the exhaust gas outlet and the heat exchange inlet, the flexible compensation assembly is adapted to reduce the air flow pressure entering the heat exchange inlet, and part of the flexible compensation assembly can be selectively deformed in the axial direction to compensate for the pressure change caused by thermal expansion and contraction of the air flow.

[0006] According to the waste heat recovery system for temperature swing adsorption of the utility model, the flexible compensation assembly is arranged to connect the exhaust gas outlet of the heating furnace with the heat exchange inlet of the heat exchanger, which reduces the impact of the air flow on the heat exchanger, thereby prolonging the service life of the heat exchanger, and can reduce the interface leakage phenomenon caused by metal fatigue under heat cycle conditions, ensuring the air tightness of the waste heat recovery system and improving the utilization rate of waste heat.

[0007] Further, the flexible compensation assembly comprises a reducer pipe having a first reducer port and a second reducer port, the first reducer port having a smaller cross-sectional area than the second reducer port, the first reducer port being in communication with the exhaust outlet, and the second reducer port being in communication with the heat exchange inlet; and a baffle plate disposed between the second reducer port and the heat exchange inlet and connected with the reducer pipe, the baffle plate being provided with a plurality of gas holes penetrating in the thickness direction.

[0008] Further, the reducer pipe has a reducer included angle a satisfying 25°≤a≤35°, the plurality of gas holes have a total cross-sectional area s1, and the baffle plate has a cross-sectional area s2 satisfying 0.38≤s1 / s2≤0.44.

[0009] Further, the flexible compensation assembly further comprises a bellows pipe, one end of the bellows pipe being connected with the baffle plate and / or the second reducer port, and the other end of the bellows pipe being connected with the heat exchange inlet; wherein the bellows pipe is adapted to be stretched or compressed in the axial direction, and the bellows pipe has a deformation length L in the axial direction satisfying |L|≤10mm.

[0010] Further, when the waste heat recovery system is shut down, the bellows pipe is in a pre-stretched state, and the pre-stretching amount of the bellows pipe is 2.5mm-3.5mm.

[0011] Further, the flexible compensation assembly further comprises a first thermal insulation layer sleeved on the outer periphery of the reducer pipe and / or the bellows pipe, the first thermal insulation layer being made of aluminum silicate; and a second thermal insulation layer sleeved on the outer periphery of the first thermal insulation layer, the second thermal insulation layer being made of stainless steel.

[0012] Further, the heating furnace, the flexible compensation assembly, and the heat exchanger are arranged in sequence in the height direction, and the heating furnace is located above the flexible compensation assembly.

[0013] Further, the flexible compensation assembly further comprises a first elbow pipe having a first inlet and a first outlet, the first inlet being in communication with the exhaust outlet in the height direction, and the first outlet being in communication with the first reducer port in the horizontal direction; and a second elbow pipe having a second inlet and a second outlet, the second inlet being in communication with the second reducer port in the horizontal direction, and the second outlet being in communication with the heat exchange inlet in the height direction; wherein the bottom of the reducer pipe is provided with a dust cleaning window.

[0014] The other advantages, objects, and features of the present application will become more apparent with knowledge of the present description; some of which will be best understood from the description of the present application and practices of the present application to those skilled in the art in a certain degree. The objects and other advantages of the present application can be realized and obtained by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the objects, technical solutions and advantages of the present application clearer, the present application is described with the following drawings:

[0016] Fig. 1 It is a schematic diagram of the waste heat recovery system for the temperature swing adsorption of the present application.

[0017] Fig. 2 It is a partial sectional view of the flexible compensation assembly of the present application.

[0018] Fig. 3 It is a structural schematic diagram of the variable diameter pipe of the present application.

[0019] The signs in the drawings are as follows:

[0020] 1, waste heat recovery system;

[0021] 10, heating furnace; 20, heat exchanger; 21, heat exchange outlet;

[0022] 30, flexible compensation assembly; 31, variable diameter pipe; 311, dust removal window; 32, baffle; 321, air hole; 33, corrugated pipe; 34, first heat preservation layer; 35, second heat preservation layer; 36, first elbow pipe; 37, second elbow pipe. DETAILED DESCRIPTION

[0023] In order to make the objects, technical solutions and advantages of the present application clearer, the present application is described with the following drawings:

[0024] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without these specific details. In other instances, well-known structures, circuits, materials or methods are not specifically described in order not to obscure the present application.

[0025] Reference throughout this specification to "one embodiment", "an embodiment", "one example", or "an example", means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the application. Thus, appearances of the phrases "in one embodiment", "in an embodiment", "in one example", or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics can be combined in any suitable

[0026] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to 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 scope of protection of the present application.

[0027] Embodiment one:

[0028] As shown in Figs. 1-3 The present application provides a waste heat recovery system 1 for temperature swing adsorption, comprising: a heating furnace 10, a heat exchanger 20, an adsorption tower and a flexible compensation assembly 30, the heating furnace 10 is provided with a waste gas outlet, the heat exchanger 20 is provided with a heat exchange inlet and a heat exchange outlet 21, the heat exchange inlet is communicated with the waste gas outlet, the adsorption tower is provided with a hot gas inlet, the hot gas inlet is communicated with the heat exchange outlet 21, the flexible compensation assembly 30 is arranged between the heating furnace 10 and the heat exchanger 20, the flexible compensation assembly 30 is adapted to communicate the waste gas outlet and the heat exchange inlet, the flexible compensation assembly 30 is adapted to reduce the air flow pressure entering the heat exchange inlet, and part of the flexible compensation assembly 30 can be optionally deformed in the axial direction to compensate for the pressure change caused by the thermal expansion and contraction of the air flow.

[0029] In some embodiments, the heating furnace 10 has a waste gas outlet for discharging high-temperature waste gas generated in the combustion process, the heat exchanger 20 comprises a heat exchange inlet and a heat exchange outlet 21, the high-temperature waste gas is received through the heat exchange inlet connected to the waste gas outlet of the heating furnace 10, and heat is transferred to other media (such as air or water) through the heat exchange process, and then the cooled waste gas is discharged through the heat exchange outlet 21, the adsorption tower is provided with a hot gas inlet directly connected to the heat exchange outlet 21 of the heat exchanger 20, the adsorption tower utilizes the heat obtained from the heat exchanger 20 to carry out a temperature swing adsorption process, and the flexible compensation assembly 30 is arranged between the heating furnace 10 and the heat exchanger 20.

[0030] The flexible compensation assembly 30 mainly functions to connect the waste gas outlet of the heating furnace 10 and the heat exchange inlet of the heat exchanger 20, and can reduce the pressure of the gas flow entering the heat exchange inlet, thereby reducing the impact of the gas flow on the heat exchanger 20, and further prolonging the service life of the heat exchanger 20, while part of the flexible compensation assembly 30 can adapt to the change in the volume of the gas in the pipeline due to temperature change, thereby reducing the pressure fluctuation of the gas flow entering the heat exchanger 20, further reducing the impact on the heat exchanger 20, and avoiding the interface leakage caused by metal fatigue under thermal cycle working conditions (if the heat exchanger is directly connected to the waste gas outlet, the interface between the waste gas outlet and the heat exchanger will leak under the action of metal fatigue under thermal cycle working conditions).

[0031] According to the waste heat recovery system 1 for temperature swing adsorption, the flexible compensation assembly is arranged to connect the waste gas outlet of the heating furnace 10 and the heat exchange inlet of the heat exchanger 20, thereby reducing the impact of the gas flow on the heat exchanger 20, prolonging the service life of the heat exchanger 20, and further reducing the interface leakage caused by metal fatigue under thermal cycle working conditions, ensuring the air tightness of the waste heat recovery system 1, and improving the utilization rate of waste heat.

[0032] In some embodiments, the heat exchanger 20 of the present application is a plate heat exchanger 20, the temperature of the waste gas when discharged from the waste gas outlet is 180℃, and the temperature of the waste gas when entering the hot gas inlet is 80℃, so that the waste heat recovery system 1 of the present application can recover 70% of the waste heat of the regenerated waste gas, thereby realizing the effective utilization of waste heat.

[0033] Embodiment two:

[0034] In this embodiment, based on the embodiment one, the flexible compensation assembly 30 comprises a variable-diameter pipe 31 and a baffle 32, the variable-diameter pipe 31 has a first variable-diameter opening and a second variable-diameter opening, the cross-sectional area of the first variable-diameter opening is smaller than that of the second variable-diameter opening, the first variable-diameter opening is in communication with the waste gas outlet, the second variable-diameter opening is in communication with the heat exchange inlet, the baffle 32 is arranged between the second variable-diameter opening and the heat exchange inlet and connected to the variable-diameter pipe 31, and the baffle 32 is provided with a plurality of gas holes 321 penetrating in the thickness direction.

[0035] In some embodiments, the flow path of the exhaust gas generated by the heating furnace 10 is: exhaust gas outlet-first reducing port-second reducing port-a plurality of air holes 321-heat exchange inlet. During the flow of the exhaust gas from the first reducing port to the second reducing port, the cross-sectional area of the reducing pipe 31 gradually increases, so that the pressure and flow rate of the exhaust gas gradually decrease when the exhaust gas flows in the reducing pipe 31, thereby buffering the pressure of the exhaust gas flow to the heat exchanger 20, and optimizing the heat transfer efficiency.

[0036] Of course, the baffle 32 also blocks the exhaust gas once to further reduce the flow rate of the exhaust gas, and adjusts and disperses the exhaust gas to a certain extent, so that the exhaust gas entering the heat exchanger 20 is more uniform, thereby improving the heat exchange efficiency. In addition, the presence of the baffle 32 can also reduce the mechanical wear caused by the direct impact of the exhaust gas on the heat exchanger 20, thereby prolonging the service life of the heat exchanger 20.

[0037] According to some embodiments of the present application, the reducing angle of the reducing pipe 31 is α, which satisfies: 25°≤α≤35°, and α is preferably 30°. The total cross-sectional area of the plurality of air holes 321 is s1, and the cross-sectional area of the baffle 32 is s2, which satisfies: 0.38≤s1 / s2≤0.44, and s1 / s2 is preferably 0.4.

[0038] In some embodiments, the reducing angle α refers to the expansion angle of the reducing pipe 31 between the first reducing port and the second reducing port, which satisfies: 25°≤α≤35°. This ensures that the exhaust gas can smoothly transition while effectively balancing the flow rate and pressure distribution, thereby avoiding unnecessary energy loss and improving the uniformity of the exhaust gas entering the heat exchanger 20, thereby improving the heat exchange efficiency. At the same time, it can avoid mechanical vibration caused by exhaust gas separation or turbulent flow, thereby prolonging the service life of the heat exchanger 20.

[0039] It is worth mentioning that when α<25°, the flow rate of the exhaust gas is too high, which increases the pressure loss and is not conducive to uniform gas distribution. When α>35°, it can cause gas separation or vortex phenomenon, reduce the heat exchange efficiency, and increase the mechanical vibration and noise in the waste heat recovery system.

[0040] Of course, the total cross-sectional area of the plurality of air holes 321 is s1, and the cross-sectional area of the baffle 32 is s2, which satisfies: 0.38≤s1 / s2≤0.44, so as to ensure that the flow rate of the exhaust gas is moderate, while maintaining the uniformity of the gas flow distribution, avoiding gas separation or turbulent flow phenomenon, thereby reducing the impact on the heat exchanger 20, and improving the heat exchange efficiency.

[0041] It is worth mentioning that when s1 / s2<0.38, the gas hole area is insufficient, which can cause the exhaust gas flow rate to be too high, increase the pressure loss, and impact the subsequent heat exchanger; when s1 / s2>0.44, the gas hole area is too much, which can weaken the regulation effect of the baffle on the airflow, cause uneven airflow distribution, and reduce the heat exchange efficiency.

[0042] Embodiment three:

[0043] In this embodiment, the flexible compensation assembly 30 further comprises a bellows 33, one end of the bellows 33 being connected with the baffle 32 and / or the second variable diameter port, and the other end of the bellows 33 being connected with the heat exchange inlet; wherein the bellows 33 is suitable for stretching or compressing in the axial direction, and the deformation length of the bellows 33 in the axial direction is L, which satisfies: |L|≤10mm.

[0044] In some embodiments, one end of the bellows 33 is connected with the baffle 32 and / or the second variable diameter port, and the other end of the bellows 33 is connected with the heat exchange inlet of the heat exchanger 20. The bellows 33 can effectively absorb the stress caused by temperature changes through its own elastic deformation (stretching or compression), reduce the mechanical vibration caused by thermal expansion and contraction, thereby avoiding excessive mechanical load on other components (heat exchanger 20) of the waste heat recovery system 1, and reducing the pressure fluctuation caused by thermal expansion and contraction, so that the exhaust gas can enter the heat exchanger 20 more smoothly.

[0045] It is worth mentioning that the axial deformation of the bellows 33 is limited within ±10mm, which can not only ensure the sufficient compensation capacity of the bellows 33, but also avoid the failure or damage of the bellows 33 caused by excessive deformation.

[0046] According to some embodiments of the present application, when the waste heat recovery system 1 is stopped, the bellows 33 is in a pre-stretched state, and the pre-stretching amount of the bellows 33 is 2.5mm-3.5mm.

[0047] It can be understood that the pre-stretched state means that when the waste heat recovery system 1 is not running (i.e. in a stopped state), the bellows 33 is not in a natural relaxed state, but a certain tension is applied in advance, so that the bellows 33 has an initial axial stretching. By applying a certain pre-stretching to the bellows 33, a buffer space can be provided when the waste heat recovery system 1 cools and shrinks, reducing the stress concentration problem caused by material cooling and shrinking, so as to effectively avoid mechanical damage of the waste heat recovery system 1 during startup and shutdown, reduce the need for maintenance and replacement of components, and help to prolong the service life of the waste heat recovery system 1.

[0048] It is worth mentioning that the pre-stretching amount of the bellows 33 is 2.5mm-3.5mm, preferably 3mm, so that the bellows 33 can effectively relieve the stress caused by temperature changes, and will not be damaged or failed due to excessive stretching.

[0049] According to some embodiments of the present application, the flexible compensation assembly 30 further comprises: a first heat preservation layer 34 and a second heat preservation layer 35, the first heat preservation layer 34 is sleeved on the outer periphery of the variable diameter pipe 31 and / or the bellows 33, the first heat preservation layer 34 is made of aluminum silicate, and the second heat preservation layer 35 is sleeved on the outer periphery of the first heat preservation layer 34, the second heat preservation layer 35 is made of stainless steel.

[0050] It is worth mentioning that the first heat preservation layer 34 is made of aluminum silicate fiber felt multi-layer staggered winding (each layer overlaps ≥50mm) to avoid the heat bridge effect; the thickness of the second heat preservation layer 35 is 0.5mm.

[0051] In some embodiments, aluminum silicate is a high-efficiency thermal insulation material with low thermal conductivity, which can effectively reduce the heat loss through the pipe wall, thereby keeping as much heat as possible in the exhaust gas to be transferred to the heat exchanger 20, and the aluminum silicate material also has good high-temperature resistance, ensuring that it can maintain its thermal insulation performance under extreme temperatures. Therefore, by using high-efficiency aluminum silicate as the inner heat preservation material, the heat loss is minimized, and the overall energy utilization rate of the waste heat recovery system 1 is improved.

[0052] Stainless steel as an external protective layer can provide physical protection for the internal aluminum silicate heat preservation layer (first heat preservation layer 34) to prevent damage to the first heat preservation layer 34 due to external impact, wear and tear, etc. Moreover, stainless steel has excellent corrosion resistance and can be used for a long time even in humid or chemical-containing environments, increasing the durability and reliability of the entire flexible compensation assembly 30. At the same time, the smooth surface of stainless steel is easy to clean and maintain, improving the overall appearance quality of the waste heat recovery system 1.

[0053] Embodiment four:

[0054] This embodiment is based on embodiment two, the heating furnace 10, the flexible compensation assembly 30 and the heat exchanger 20 are arranged in the height direction in turn, and the heating furnace 10 is located above the flexible compensation assembly.

[0055] In some embodiments, the exhaust gas flows from the heating furnace 10 to the heat exchanger 20 below, which can use the weight of the exhaust gas itself to assist its downward flow, reducing the need for additional power, helping to save energy, and helping to maintain a more uniform pressure distribution of the airflow within the entire waste heat recovery system 1, avoiding local high or low pressure areas that may be caused by horizontal arrangement, thereby improving the overall operating efficiency.

[0056] According to some embodiments of the present application, the flexible compensation assembly 30 further comprises: a first elbow pipe 36 and a second elbow pipe 37, the first elbow pipe 36 has a first inlet and a first outlet, the first inlet is communicated with the exhaust outlet in the height direction, the first outlet is communicated with the first variable-diameter port in the horizontal direction, the second elbow pipe 37 has a second inlet and a second outlet, the second inlet is communicated with the second variable-diameter port in the horizontal direction, and the second outlet is communicated with the heat exchange inlet in the height direction; wherein the bottom of the variable-diameter pipe 31 is provided with a dust cleaning window 311.

[0057] In some embodiments, the first elbow pipe 36 and the second elbow pipe 37 change the flow direction of the exhaust gas, so that the flow direction of the exhaust gas is vertical-horizontal-vertical. After passing through the first elbow pipe 36, the flow direction of the exhaust gas is horizontal, at this time, the exhaust gas will pass through the variable-diameter pipe 31 and the baffle 32 in the horizontal direction, at this time, the baffle 32 will block the dust mixed in the exhaust gas, and under the action of gravity, the dust will stay in the variable-diameter pipe 31. When the dust accumulates to a certain extent (or when the user regularly checks and cleans), the user can clean the dust through the dust cleaning window 311, of course, the user can also clean the air holes 321 on the baffle 32 through the dust cleaning window 311.

[0058] It is worth mentioning that the first heat preservation layer 34 is also sleeved on the outer periphery of the first elbow pipe 36 and the second elbow pipe 37. The outer peripheral wall of the end of the second elbow pipe 37 connected with the corrugated pipe 33 is provided with a first connecting lug protruding radially outward, the end of the variable-diameter pipe 31 connected with the corrugated pipe 33 (the end of the variable-diameter pipe 31 close to the second variable-diameter port) is provided with a second connecting lug extending in the radial direction, the first connecting lug is provided with a plurality of sliding rods, the plurality of sliding rods are arranged at intervals in the circumferential direction, the second connecting lug is provided with a plurality of sliding holes, the plurality of sliding holes are respectively arranged in one-to-one correspondence with the plurality of sliding rods, and the plurality of sliding rods respectively extend in the axial direction towards the second connecting lug and are respectively slidably arranged in the corresponding sliding holes.

[0059] Finally, it should be pointed out that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application.

Claims

1. A waste heat recovery system for use in temperature swing adsorption, characterized by, The waste heat recovery system comprises: a heating furnace provided with a waste gas outlet; a heat exchanger provided with a heat exchange inlet and a heat exchange outlet, the heat exchange inlet being in communication with the waste gas outlet; an adsorption tower provided with a hot gas inlet, the hot gas inlet being in communication with the heat exchange outlet; a flexible compensation assembly arranged between the heating furnace and the heat exchanger, the flexible compensation assembly being adapted to communicate the waste gas outlet and the heat exchange inlet, the flexible compensation assembly being adapted to reduce the pressure of the gas flow entering the heat exchange inlet, and part of the flexible compensation assembly being selectively deformed in the axial direction to compensate for the pressure change caused by thermal expansion and contraction of the gas flow.

2. The waste heat recovery system for temperature swing adsorption according to claim 1, characterized by, The flexible compensation assembly comprises: a variable-diameter pipe having a first variable-diameter opening and a second variable-diameter opening, the cross-sectional area of the first variable-diameter opening being smaller than that of the second variable-diameter opening, the first variable-diameter opening being in communication with the waste gas outlet, and the second variable-diameter opening being in communication with the heat exchange inlet; a baffle plate arranged between the second variable-diameter opening and the heat exchange inlet and connected with the variable-diameter pipe, the baffle plate being provided with a plurality of gas holes penetrating in the thickness direction.

3. The waste heat recovery system for temperature swing adsorption according to claim 2, characterized by, The variable-diameter angle of the variable-diameter pipe is α, and satisfies 25°≤α≤35°, the total cross-sectional area of the plurality of gas holes is s1, and the cross-sectional area of the baffle plate is s2, and satisfies 0.38≤s1 / s2≤0.

44.

4. The waste heat recovery system for temperature swing adsorption according to claim 3, characterized by, The flexible compensation assembly further comprises: a bellows, one end of the bellows being connected with the baffle plate and / or the second variable-diameter opening, and the other end of the bellows being connected with the heat exchange inlet; wherein the bellows is adapted to be stretched or compressed in the axial direction, and the deformation length of the bellows in the axial direction is L, and satisfies |L|≤10mm.

5. The waste heat recovery system for temperature swing adsorption according to claim 4, characterized by, When the waste heat recovery system is shut down, the bellows is in a pre-stretched state, and the pre-stretching amount of the bellows is 2.5mm-3.5mm.

6. The waste heat recovery system for temperature swing adsorption according to claim 5, characterized by The flexible compensation assembly further comprises: a first heat preservation layer, the first heat preservation layer being sleeved on the outer periphery of the variable-diameter pipe and / or the bellows, the first heat preservation layer being made of aluminum silicate; a second heat preservation layer, the second heat preservation layer being sleeved on the outer periphery of the first heat preservation layer, the second heat preservation layer being made of stainless steel.

7. The waste heat recovery system for temperature swing adsorption according to claim 2, characterized by, The heating furnace, the flexible compensation assembly, and the heat exchanger are arranged in sequence in the height direction, and the heating furnace is located above the flexible compensation assembly.

8. The waste heat recovery system for temperature swing adsorption according to claim 7, characterized by, The flexible compensation assembly further comprises: a first elbow pipe having a first inlet and a first outlet, the first inlet being in communication with the waste gas outlet in the height direction, and the first outlet being in communication with the first variable-diameter opening in the horizontal direction; a second elbow pipe having a second inlet and a second outlet, the second inlet being in communication with the second variable-diameter opening in the horizontal direction, and the second outlet being in communication with the heat exchange inlet in the height direction; wherein the bottom of the variable-diameter pipe is provided with a dust cleaning window.

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