A multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device

Abstract

The present application relates to heat exchange, more particularly to the technical field of waste heat utilization, and discloses a multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device, which comprises a heat exchange cavity one and a base, a heat exchange one part is arranged on the heat exchange cavity one, a heat exchange two part is connected to the heat exchange one part, a conveying part is connected to the heat exchange two part, a heat exchange three part is arranged on the conveying part, a regulating part is arranged in alignment on the heat exchange three part, a main machine box is installed on the base, an equipment mounting rack is installed on the base, the heat exchange one part comprises a centrifugal fan, the multi-stage heat exchange and waste heat backflow closed-loop structure is adopted, and the waste heat gas generated in the industrial pre-process is captured, so that the complete heat recovery and regeneration utilization path is formed in cooperation with the multi-cavity, the waste heat is avoided from being directly dissipated, the heat value of the high-temperature gas is maximized, and the effect that the waste heat is efficiently recovered and recycled and meets the green and energy-saving industrial development trend is achieved.

Description

Technical Field

[0001] This invention relates to heat exchange, and more specifically to the field of waste heat utilization technology, specifically a multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device. Background Technology

[0002] In industrial production, the drying of gaseous media is a crucial step in ensuring the stability of production processes, product quality, and the service life of subsequent equipment. It is widely used in industries such as chemical, steel, pharmaceutical, lithium battery manufacturing, and semiconductors. To achieve deep drying of gaseous media, heat exchange devices are required in relevant production systems. Through heat transfer and recycling, these devices provide energy support for processes such as gas drying and adsorbent regeneration. The heat exchange efficiency and waste heat recovery capacity directly affect the energy consumption level and operating costs of the entire production system.

[0003] Currently, most heat exchange devices used in the industrial field are designed with the core objective of meeting basic heat exchange needs. Although they can achieve basic heat transfer functions, in terms of waste heat recovery and recycling, a large amount of waste heat is generated in the gas during the pre-processing of compression, drying and other processes. Traditional heat exchange devices generally have defects such as weak waste heat capture capacity, single recovery path, large heat transfer loss and uneven airflow distribution. A large amount of waste heat is directly cooled and lost, resulting in low energy utilization and failing to meet the requirements of green energy saving.

[0004] On the other hand, conventional heat exchangers are mostly fixed heat exchange structures, and high-temperature airflow is prone to unidirectional segregation, resulting in uneven heating of the heat exchange surface and insufficient regeneration.

[0005] When the temperature and flow rate of the waste heat generated by the upstream process fluctuate, the device cannot adaptively adjust, which can easily lead to insufficient or excessive heat supply, making it difficult to guarantee system stability and heat exchange efficiency. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device, which solves the problems of low waste heat recovery and utilization rate, large heat transfer loss, uneven airflow distribution, poor adaptive adjustment capability for operating condition fluctuations, and insufficient waste heat regeneration in traditional heat exchange devices.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device, comprising a heat exchange chamber and a base, wherein a heat exchange unit is provided on the heat exchange chamber, a heat exchange unit is connected to the heat exchange unit, a conveying unit is connected to the heat exchange unit, a heat exchange unit is provided on the conveying unit, and a control unit is aligned on the heat exchange unit, a main unit is mounted on the base, and an equipment mounting bracket is mounted on the base.

[0008] Preferably, the heat exchange unit includes a centrifugal fan, the outlet of which is connected to a heat exchange tube, the outer wall of which is fixedly connected to a heat exchange chamber, the heat exchange tube being located inside the heat exchange chamber and fixedly extending to the outside of the heat exchange chamber, a spiral blade being fixedly connected to the inner wall of the heat exchange chamber, the spiral blade being fixedly sleeved on the outer wall of the heat exchange tube, a connecting pipe being connected to the heat exchange chamber, a one-way valve being installed on the connecting pipe, an air inlet pipe being connected to the air inlet of the centrifugal fan, and a filter port being installed at the end of the air inlet pipe.

[0009] Preferably, the second heat exchange section includes a second heat exchange chamber, which is connected to the first heat exchange chamber via a connecting pipe. A dividing plate is fixedly connected to the inner wall of the second heat exchange chamber, and a sliding cavity is fixedly connected to one side of the dividing plate. A sliding plate is slidably connected to the inner wall of the sliding cavity, and a spring is elastically connected between the sliding plate and the inner wall of the sliding cavity. Air holes are circumferentially opened on the sliding cavity.

[0010] Preferably, the conveying unit includes a heat exchange chamber three, in which a fuel pipe is installed. The fuel pipe has a three-fold structure, and a first bend, a second bend, and a third bend are sequentially arranged on the fuel pipe. The angles of the first bend, the second bend, and the third bend are all 90 degrees. The through end of the heat exchange tube one is connected to the heat exchange chamber three.

[0011] Preferably, the first bend point is located inside the heat exchange chamber three, the heat exchange chamber three is installed between the second bend point and the third bend point, one end of the fuel pipe is fixedly extended to the outside of the heat exchange chamber three, the other end of the fuel pipe is fixedly fitted with the heat exchange chamber four, and the other end of the fuel pipe continues to be fixedly extended to the outside of the heat exchange chamber four.

[0012] Preferably, a pressure relief valve is installed on the heat exchange chamber four, and a circulation pipe is installed between both ends of the heat exchange chamber four and both ends of the heat exchange chamber two. A one-way valve two and a one-way valve three are respectively installed on the two circulation pipes.

[0013] Preferably, the heat exchange chamber includes a cylindrical cavity that is slidably fitted onto the outer wall of the fuel pipe. A sliding hole is provided on one side of the cylindrical cavity. A bent pipe is fixedly connected to one end of the heat exchange chamber and is slidably connected to the sliding hole. A tension spring is elastically connected between the cylindrical cavity and the heat exchange chamber and is movably fitted onto the bent pipe. A gasket is fixedly fitted to the end of the bent pipe and is located inside the cylindrical cavity. The cylindrical cavity is connected to the heat exchange chamber through the bent pipe.

[0014] Preferably, a pressure relief valve two is installed on the cylindrical cavity, a pipe joint is connected to one side of the heat exchange cavity one, and an expansion joint is connected between the pressure relief valve two and the pipe joint.

[0015] Preferably, the control unit includes a bracket, on which an electric actuator is mounted. The movable end of the electric actuator is fixedly connected to an arc-shaped disk, which is slidably sleeved on the outer wall of the fuel pipe. A push-button switch is mounted on the arc-shaped disk.

[0016] Preferably, the bracket is fixedly connected to the outer wall of the main unit box, and a processor is provided inside the main unit box. The processor is electrically connected to the centrifugal fan, one-way valve one, one-way valve two, one-way valve three, pressure relief valve one, pressure relief valve two, electric actuator and push button switch respectively. The heat exchange chamber one, heat exchange chamber two, heat exchange chamber three and heat exchange chamber four are all installed on the equipment mounting frame.

[0017] (III) Beneficial Effects Compared with the prior art, the present invention provides a multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device, which has the following beneficial effects: 1. By adopting a multi-stage heat exchange and waste heat recirculation closed-loop structure and specifically capturing the waste heat gas generated by the industrial pre-process, and coordinating with multiple chambers to form a complete heat recovery and regeneration path, the direct loss of waste heat is avoided and the heat value of high-temperature gas is maximized. This achieves efficient waste heat recovery and recycling, and is in line with the trend of green and energy-saving industrial development.

[0018] 2. By setting a spiral flow guide structure in the heat exchange cavity to optimize the flow state of high-temperature airflow and eliminate the phenomenon of unidirectional airflow segregation, and by constructing a closed circulation loop in combination with the circulation pipeline to extend the residence time of waste heat in the cavity, and by combining multiple cavities to form a stable heat exchange environment, the effects of reducing heat transfer loss and improving heat exchange uniformity are achieved.

[0019] 3. By adopting a processor and control unit linkage control mode, the system pressure and position signals are collected in real time and the fan operation status, valve on / off status and heat exchange component position are adaptively adjusted to effectively cope with waste heat temperature and flow fluctuations, and the heat exchange process is stabilized and controllable with significantly enhanced adaptability to operating conditions.

[0020] 4. By using a single fan to provide the system's circulating power and having the processor coordinate the operating parameters of each component, along with pressure relief protection, air intake filtration, and multiple safety protection structures, the system's safe operation is ensured and the occurrence of failures is reduced, achieving the effects of reduced energy consumption and extended service life.

[0021] 5. By using a sliding cylindrical cavity to form a dynamic heat exchange interface and combining it with a three-fold pipeline to extend the heat exchange path, the heated medium can absorb heat evenly throughout the entire area, avoiding insufficient or overheating in certain areas. This achieves a balanced and stable heat exchange effect and improves the quality of subsequent process treatment. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the overall front structure of the present invention; Figure 2 This is a schematic diagram of the overall rear structure of the present invention; Figure 3 This is an internal sectional view of heat exchange cavity one and heat exchange cavity two of the present invention; Figure 4 This is a cross-sectional view of the sliding cavity of the present invention; Figure 5 This is a diagram showing the assembly of the conveying unit and the control unit of the present invention; Figure 6 This is a schematic diagram of the structure of the bend in this invention; Figure 7 This is a schematic diagram of the expansion joint of the present invention; Figure 8 This is a connection diagram of heat exchange cavity four and heat exchange cavity two of the present invention.

[0023] In the diagram: 1. Heat exchange chamber one; 2. Heat exchange section one; 21. Centrifugal fan; 22. Heat exchange tube one; 23. Spiral blade; 24. Connecting pipe; 25. One-way valve one; 26. Inlet pipe; 27. Filter port; 3. Heat exchange section two; 31. Heat exchange chamber two; 32. Dividing plate; 33. Sliding cavity; 34. Sliding plate; 35. Spring; 36. Air hole; 4. Conveying section; 41. Heat exchange chamber three; 42. Fuel pipe; 43. First bend point; 44. ... 45. Second bend point; 46. Third bend point; 47. Heat exchange chamber four; 48. Pressure relief valve one; 59. Circulation pipe; 50. Heat exchange section three; 51. Cylindrical cavity; 52. Sliding hole; 53. Bend; 54. Tension spring; 55. Gasket; 56. Pressure relief valve two; 57. Expansion joint; 58. Pipe joint; 69. Control section; 60. Bracket; 61. Electric actuator; 62. Arc-shaped disc; 63. Push button switch; 7. Main unit box; 8. Base; 9. Equipment mounting bracket. Detailed Implementation

[0024] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1-8This invention provides a multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device, including a heat exchange chamber 1 and a base 8. A heat exchange unit 2 is provided on the heat exchange chamber 1. A heat exchange unit 3 is connected to the heat exchange unit 2. A conveying unit 4 is connected to the heat exchange unit 3. A heat exchange unit 5 is provided on the conveying unit 4. A control unit 6 is aligned on the heat exchange unit 5. A main unit 7 (containing signal acquisition elements, drive elements and protection elements) is installed on the base 8. An equipment mounting bracket 9 is installed on the base 8.

[0026] In this invention, the heat exchange unit 2 includes a centrifugal fan 21 (4-72-5A variable frequency), and a heat exchange tube 22 is connected to the outlet of the centrifugal fan 21. The outer wall of the centrifugal fan 21 is fixedly connected to the heat exchange chamber 1. The heat exchange tube 22 is located inside the heat exchange chamber 1 and fixedly extends to the outside of the heat exchange chamber 1. A spiral blade 23 is fixedly connected to the inner wall of the heat exchange chamber 1. The spiral structure not only increases the contact area between the heat exchange tube 22 and the gas inside the heat exchange chamber 1, but also guides the gas to form a spiral flow, avoiding uneven heat distribution caused by unidirectional flow segregation. The spiral blades 23 are fixedly sleeved on the outer wall of the heat exchange tube 22. A connecting pipe 24 is installed on the heat exchange chamber 1. A one-way valve 25 (ZCT-15 electromagnetic) is installed on the connecting pipe 24. An air inlet pipe 26 is installed at the air inlet of the centrifugal fan 21. A filter port 27 is installed at the end of the air inlet pipe 26. The gas is drawn, compressed and heated by the centrifugal fan 21 and transported to the subsequent chamber through the heat exchange tube 22. At the same time, the spiral blades 23 are used to optimize the gas flow, realize preliminary heat exchange and gas pretreatment, and provide a clean and high-temperature waste heat source for the entire system.

[0027] Furthermore, the second heat exchange unit 3 includes a second heat exchange chamber 31, which is connected to the first heat exchange chamber 1 via a connecting pipe 24. A dividing plate 32 is fixedly connected to the inner wall of the second heat exchange chamber 31, and a sliding cavity 33 is fixedly connected to one side of the dividing plate 32. A sliding plate 34 is slidably connected to the inner wall of the sliding cavity 33, and a spring 35 is elastically connected between the sliding plate 34 and the inner wall of the sliding cavity 33. Air holes 36 are opened around the sliding cavity 33. Gas diversion is achieved through the structure of the dividing plate 32 and the sliding cavity 33. A gas circulation loop is constructed with the circulation pipe 48 to extend the residual heat residence time, complete the third heat exchange, and reduce heat loss.

[0028] In this embodiment, the conveying unit 4 includes a heat exchange chamber 3 41, in which a fuel pipe 42 is installed. The fuel pipe 42 has a three-fold structure, with a first bend point 43, a second bend point 44, and a third bend point 45 sequentially arranged on it. The angles of the first bend point 43, the second bend point 44, and the third bend point 45 are all 90 degrees. The through end of the heat exchange pipe 22 is connected to the heat exchange chamber 3 41. The first bend point 43 is located inside the heat exchange chamber 3 41. The heat exchange unit 5 is installed between the second bend point 44 and the third bend point 45. One end of the fuel pipe 42 is fixedly extended to the outside of the heat exchange chamber 3 41, and the other end of the fuel pipe 42 is fixedly fitted with a heat exchange chamber 46. The other end of the fuel pipe 42 is further fixed. The gas flows through to the outside of heat exchange chamber 46. A pressure relief valve 47 (Y42X-16C electromagnetic) is installed on heat exchange chamber 46. Both ends of heat exchange chamber 46 are connected to both ends of heat exchange chamber 2 31 by circulation pipes 48. One-way valves 2 and 3 (both using ZCT-20 electromagnetic) are installed on the two circulation pipes 48 respectively. One-way valve 2 controls the gas to flow from heat exchange chamber 2 31 to heat exchange chamber 46, and one-way valve 3 controls the gas to flow back from heat exchange chamber 46 to heat exchange chamber 2 31. The heat exchange path is extended through the fuel pipe 42 with a three-fold structure. The first and third heat exchanges are achieved with the help of heat exchange chamber 3 41 and heat exchange chamber 46 respectively. At the same time, the gas circulation and system pressure safety are ensured through circulation pipes 48 and pressure relief valve 47.

[0029] It is worth noting that the heat exchange section 5 includes a cylindrical cavity 51, which is slidably sleeved on the outer wall of the fuel pipe 42. A sliding hole 52 is provided on one side of the cylindrical cavity 51. A bent pipe 53 is fixedly connected to one end of the heat exchange section 41, and the bent pipe 53 is slidably connected to the sliding hole 52. A tension spring 54 is elastically connected between the cylindrical cavity 51 and the heat exchange section 41. The tension spring 54 is movably sleeved on the bent pipe 53. A gasket 55 is fixedly sleeved at the end of the bent pipe 53. The gasket 55 is located inside the cylindrical cavity 51 and serves as a limiting device to prevent the cylindrical cavity 51 from moving. Excessive sliding detaches from the bend 53. The cylindrical cavity 51 is connected to the heat exchange cavity 3 41 through the bend 53. A pressure relief valve 2 56 (Y42X-16C electromagnetic) is installed on the cylindrical cavity 51. A pipe joint 58 is connected to one side of the heat exchange cavity 1. An expansion joint 57 is installed between the pressure relief valve 2 56 and the pipe joint 58. A dynamic heat exchange interface is formed by the sliding structure of the cylindrical cavity 51. After extracting the waste heat, the underutilized waste heat is returned to the heat exchange cavity 1 through the pressure relief valve 2 56 and the expansion joint 57 to realize waste heat regeneration.

[0030] Furthermore, the control unit 6 includes a bracket 61, on which an electric actuator 62 (DTZ300 DC electric actuator) is mounted. The movable end of the electric actuator 62 is fixedly connected to an arc-shaped disk 63, which is slidably sleeved on the outer wall of the fuel pipe 42. A push-button switch 64 (LXW5-11Q2 travel-type micro switch) is mounted on the arc-shaped disk 63. The electric actuator 62 drives the arc-shaped disk 63 to reciprocate, adjusting the heat exchange position and frequency of the cylindrical cavity 51. This, in conjunction with the processor, enables adaptive adjustment of operating conditions, ensuring heat exchange stability.

[0031] It is worth noting that the bracket 61 is fixedly connected to the outer wall of the main unit 7. The main unit 7 is equipped with a processor (STM32H743VIT6). The processor is electrically connected to the centrifugal fan 21, one-way valve 25, one-way valve 2, one-way valve 3, pressure relief valve 47, pressure relief valve 56, electric actuator 62 and push button switch 64, respectively, to realize centralized control and coordinated scheduling of all system components. Heat exchange chamber 1, heat exchange chamber 2 31, heat exchange chamber 3 41 and heat exchange chamber 4 46 are all installed on the equipment mounting bracket 9.

[0032] Signal acquisition components used in this device can include pressure sensors, position sensors, etc. The driving components used in this device can be such as relay modules (HH52P), MOSFET driver boards (IRF540), DC-DC power supply modules, etc. Protective components used in this device can include fuses (2A / 250V), TVS transient suppression diodes, electromagnetic interference filters, etc. The processor integrates all sensor signals through the CAN bus and realizes multi-device collaboration based on a preset algorithm (PID control algorithm).

[0033] Working principle: After the centrifugal fan 21 is started, it actively extracts the gas or air containing residual heat generated in the industrial preprocess through the air inlet pipe 26 connected to its air inlet. The filter port 27 installed at the end of the air inlet pipe 26 pre-treats the gas, filtering out impurities such as dust and particulate matter, so as to avoid impurities affecting the heat exchange efficiency or damaging the equipment, and to ensure that the gas medium entering the system is clean.

[0034] After the gas enters the centrifugal fan 21, the molecular kinetic energy increases under the compression action of the fan, and the temperature rises further, forming a high-temperature and high-pressure gas, realizing the initial enhancement of waste heat and providing a sufficient heat source for subsequent heat exchange. The high-temperature and high-pressure gas is continuously transported to the heat exchange chamber 41 of the conveying section 4 through the heat exchange pipe 22 connected to the outlet of the centrifugal fan 21, completing the initial capture and transport of waste heat.

[0035] The fuel pipe 42 of the conveying unit 4 begins to convey gaseous fuel. The fuel pipe 42 adopts a three-fold structure, with a first bend point 43, a second bend point 44, and a third bend point 45 set in sequence. The first bend point 43 is located inside the heat exchange chamber 3 41. This bend structure extends the path length of the fuel pipe 42 in the heat exchange chamber 3 41. When the high-temperature waste heat gas conveyed by the heat exchange pipe 1 22 enters the heat exchange chamber 3 41, it forms the first heat exchange with the low-temperature fuel flowing in the fuel pipe 42. The heat of the high-temperature gas is conducted to the fuel inside the pipe through the pipe wall of the fuel pipe 42, which raises the fuel temperature and provides preheating energy for subsequent processes.

[0036] The waste heat gas after the first heat exchange in heat exchange chamber 3 41 enters the cylindrical cavity 51 of heat exchange section 5 through the bent pipe 53 fixedly connected to one end of heat exchange chamber 3 41. The bent pipe 53 is hollow inside, forming a gas flow channel. The cylindrical cavity 51 is kept in communication with heat exchange chamber 3 41 through the bent pipe 53. The high temperature waste heat gas expands in volume in the cylindrical cavity 51 and gradually accumulates pressure.

[0037] The cylindrical cavity 51 is slidably sleeved between the second bend point 44 and the third bend point 45 of the fuel pipe 42. The sliding hole 52 on one side of the cylindrical cavity 51 forms a sliding fit with the bend pipe 53. The cylindrical cavity 51 and the heat exchange cavity 41 are elastically connected by a tension spring 54 movably sleeved on the bend pipe 53. When the gas pressure in the cylindrical cavity 51 is greater than the elastic tension of the tension spring 54, the gas expands and pushes the cylindrical cavity 51 to slide along the axial direction of the fuel pipe 42, stretching the tension spring 54 and storing elastic potential energy.

[0038] During the sliding process of the cylindrical cavity 51, its inner wall is always in close contact with the outer wall of the fuel pipe 42, forming a dynamic heat exchange interface. The high-temperature gas in the cylindrical cavity 51 exchanges heat with the fuel in the fuel pipe 42 through the cavity wall, further extracting waste heat and realizing the deep utilization of waste heat.

[0039] When the cylindrical cavity 51 slides, it presses the button switch 64 of the control section 6. The button switch 64 activates the electric push rod 62. The movable end of the electric push rod 62 pushes the arc-shaped disk 63 to slide along the fuel pipe 42, pushing the cylindrical cavity 51 back. Since the gas in the cylindrical cavity 51 continues to enter, the pressure is always present and will continue to press against the button switch 64, causing the electric push rod 62 to reciprocate. This causes the cylindrical cavity 51 to slide back and forth between the second bend point 44 and the third bend point 45, continuously exchanging heat at the node of the fuel pipe 42, improving the heat exchange uniformity and efficiency.

[0040] When the pressure inside the cylindrical cavity 51 exceeds the set threshold of the pressure relief valve 56, the pressure relief valve 56 automatically opens. The high-temperature gas flows through the expansion joint 57 connected to the pressure relief valve 56 to the pipe joint 58 connected to the side of the heat exchange chamber 1, and finally re-enters the heat exchange chamber 1. The returning high-temperature gas exchanges heat with the gas in the heat exchange tube 22 again, realizing the regeneration and utilization of waste heat.

[0041] The hot gas, after being uniformly heated by the spiral blades 23 in the heat exchange chamber 1, flows along the end of the spiral blades 23 to the connecting pipe 24 connected to the heat exchange chamber 1. The one-way valve 25 installed on the connecting pipe 24 ensures that the gas flows in one direction and prevents backflow. The hot gas enters the heat exchange chamber 31 through the one-way valve 25.

[0042] Hot gas gradually accumulates in heat exchange chamber 2 31, and the pressure continues to rise. The dividing plate 32, which is fixedly connected to the inner wall of heat exchange chamber 2 31, divides the interior of the chamber into two areas. When the pressure in heat exchange chamber 2 31 pushes the sliding plate 34 to slide along the sliding cavity 33, compressing the spring 35, when the sliding plate 34 slides to the position of the air hole 36 opened around the sliding cavity 33, the hot gas overflows from the air hole 36 to the other side of the dividing plate 32 and continues to remain in heat exchange chamber 2 31, avoiding heat loss caused by rapid gas loss.

[0043] The two ends of heat exchange chamber 2 31 and the two ends of heat exchange chamber 46 are connected by two circulation pipes 48. The high-temperature gas overflowing from the vent 36 flows into heat exchange chamber 46 through the circulation pipe 48 with one-way valve 2 installed. Heat exchange chamber 46 is fixedly sleeved on the other end of fuel pipe 42. At this time, the fuel in fuel pipe 42 has been significantly heated after the first two heat exchanges. After entering the area of ​​heat exchange chamber 46, it forms a third heat exchange with the high-temperature circulating gas in the chamber, further absorbing the residual heat and making the fuel temperature meet the requirements of subsequent processes.

[0044] After the third heat exchange, the gas forms a certain pressure in heat exchange chamber 46. When the pressure meets the reflux conditions, it flows back to heat exchange chamber 31 through circulation pipe 48 with one-way valve 3, and mixes with the high-temperature gas newly entering from connecting pipe 24. This circulation mixing mode ensures that heat exchange chamber 31 and heat exchange chamber 46 always have sufficient high-temperature gas, forming a stable heat preservation and heat exchange environment, avoiding rapid heat loss, and ensuring that the fuel in fuel pipe 42 continuously absorbs residual heat.

[0045] The pressure relief valve 47 installed on heat exchange chamber 46 plays a safe pressure relief role. When the gas pressure in heat exchange chamber 46 exceeds the set threshold, the pressure relief valve 47 automatically opens to release some gas, reduce the pressure in the chamber, avoid damage to the equipment due to excessive pressure, and ensure the safe operation of the system.

[0046] Throughout the entire operation, only one centrifugal fan 21 is needed to provide the gas flow power, which can drive the hot gas to circulate in heat exchange chamber 1, heat exchange chamber 2 31, cylindrical chamber 51, heat exchange chamber 3 41, and heat exchange chamber 46 to complete multiple heat exchanges. The processor optimizes the operating parameters of each component to minimize energy consumption and achieve energy-saving operation while meeting the heat exchange requirements.

[0047] After multiple heat exchanges, the high-temperature fuel is discharged from one end of the fuel pipe 42 through the heat exchange chamber 46 and transported to subsequent industrial processes (such as gas drying, adsorbent regeneration, etc.) to provide energy support for the production process. The waste heat gas that is not fully utilized in the system is continuously returned through the circulation pipe 48 and repeatedly participates in the heat exchange process until the heat is fully utilized. Then it is discharged through the pressure relief valve 47. This solves the problems of low waste heat recovery efficiency, large heat loss and insufficient adaptability to operating conditions in traditional devices, and realizes the maximum recovery and energy-saving utilization of industrial waste heat.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device, comprising a heat exchange chamber (1) and a base (8), characterized in that: The heat exchange chamber 1 (1) is provided with a heat exchange part 1 (2) for initial heat exchange, the heat exchange part 1 (2) is connected to a heat exchange part 2 (3), the heat exchange part 2 (3) is connected to a conveying part (4) for fuel conveying and heat exchange, the conveying part (4) is provided with a heat exchange part 3 (5) for waste heat secondary heat exchange and regeneration return, the heat exchange part 3 (5) is provided with an adjustment part (6) for adaptive adjustment of heat exchange position, the base (8) is provided with a main unit box (7), and the base (8) is provided with an equipment mounting bracket (9). The heat exchange unit (2) includes a centrifugal fan (21), the outlet of the centrifugal fan (21) is connected to a heat exchange tube (22), the outer wall of the centrifugal fan (21) is fixedly connected to the heat exchange chamber (1), the heat exchange tube (22) is located inside the heat exchange chamber (1) and fixedly extends to the outside of the heat exchange chamber (1), the inner wall of the heat exchange chamber (1) is fixedly connected to a spiral blade (23), the spiral blade (23) is also fixedly sleeved on the outer wall of the heat exchange tube (22), a connecting pipe (24) is connected to the heat exchange chamber (1), a one-way valve (25) is installed on the connecting pipe (24), an air inlet pipe (26) is connected to the air inlet of the centrifugal fan (21), and a filter port (27) is installed at the end of the air inlet pipe (26).

2. The multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device according to claim 1, characterized in that: The second heat exchange unit (3) includes a second heat exchange chamber (31), which is connected to the first heat exchange chamber (1) via a connecting pipe (24). A dividing plate (32) is fixedly connected to the inner wall of the second heat exchange chamber (31). A sliding cavity (33) is fixedly connected to one side of the dividing plate (32). A sliding plate (34) is slidably connected to the inner wall of the sliding cavity (33). A spring (35) is elastically connected between the sliding plate (34) and the inner wall of the sliding cavity (33). An air hole (36) is opened around the sliding cavity (33).

3. The multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device according to claim 2, characterized in that: The conveying unit (4) includes a heat exchange chamber three (41), in which a fuel pipe (42) is installed. The fuel pipe (42) has a three-fold structure and is provided with a first bend point (43), a second bend point (44) and a third bend point (45) in sequence. The angles of the first bend point (43), the second bend point (44) and the third bend point (45) are all ninety degrees. The through end of the heat exchange tube one (22) is connected to the heat exchange chamber three (41).

4. The multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device according to claim 3, characterized in that: The first bend point (43) is located inside the heat exchange chamber three (41). The heat exchange three parts (5) are installed between the second bend point (44) and the third bend point (45). One end of the fuel pipe (42) is fixedly inserted through the outside of the heat exchange chamber three (41). The other end of the fuel pipe (42) is fixedly fitted with the heat exchange chamber four (46). The other end of the fuel pipe (42) continues to be fixedly inserted through the outside of the heat exchange chamber four (46).

5. The multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device according to claim 4, characterized in that: A pressure relief valve (47) is installed on the heat exchange chamber four (46). A circulation pipe (48) is installed between the two ends of the heat exchange chamber four (46) and the two ends of the heat exchange chamber two (31). A one-way valve two and a one-way valve three are respectively installed on the two circulation pipes (48).

6. The multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device according to claim 5, characterized in that: The heat exchange section (5) includes a cylindrical cavity (51), which is slidably sleeved on the outer wall of the fuel pipe (42). A sliding hole (52) is provided on one side of the cylindrical cavity (51). A bent pipe (53) is fixedly connected to one end of the heat exchange section (41). The bent pipe (53) is slidably connected to the sliding hole (52). A tension spring (54) is elastically connected between the cylindrical cavity (51) and the heat exchange section (41). The tension spring (54) is movably sleeved on the bent pipe (53). A gasket (55) is fixedly sleeved at the end of the bent pipe (53). The gasket (55) is located inside the cylindrical cavity (51). The cylindrical cavity (51) is connected to the heat exchange section (41) through the bent pipe (53).

7. The multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device according to claim 6, characterized in that: A pressure relief valve (56) is installed on the cylindrical cavity (51), and a pipe joint (58) is connected to one side of the heat exchange cavity (1). An expansion joint (57) is connected between the pressure relief valve (56) and the pipe joint (58).

8. The multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device according to claim 7, characterized in that: The control unit (6) includes a bracket (61), on which an electric push rod (62) is mounted. The movable end of the electric push rod (62) is fixedly connected to an arc-shaped disk (63). The arc-shaped disk (63) is slidably sleeved on the outer wall of the fuel pipe (42). A push button switch (64) is mounted on the arc-shaped disk (63).

9. A multi-stage heat exchange and waste heat regeneration closed-loop heat exchange device according to claim 8, characterized in that: The bracket (61) is fixedly connected to the outer wall of the main unit box (7). The main unit box (7) is equipped with a processor. The processor is electrically connected to the centrifugal fan (21), one-way valve one (25), one-way valve two, one-way valve three, pressure relief valve one (47), pressure relief valve two (56), electric push rod (62) and push button switch (64). The heat exchange chamber one (1), heat exchange chamber two (31), heat exchange chamber three (41) and heat exchange chamber four (46) are all installed on the equipment mounting bracket (9).

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