High-efficiency energy-saving combined heat exchange device

Abstract

The utility model relates to energy exchange equipment technical field, concretely relates to a kind of high-efficiency energy-saving combined heat exchange device, at least comprising first heat exchanger and second heat exchanger;The heat exchange passage of first heat exchanger is condensed to the matter that is passed in, and the high-temperature matter after condensation enters the heat exchange passage of second heat exchanger after first reducing component, and is condensed again, and the liquid after condensation is collected separately or together again.Can realize heat recovery, reduce resource waste, and carry out multistage cooling to realize the condensation of one gaseous substance or the separation of multiple gaseous substances, enhance the recovery rate of low-boiling-point substance, reduce external discharge amount.For the separation of a small amount of light-boiling substance in waste liquid, fractional cooling has better separation effect.

Description

Technical Field

[0001] This utility model relates to the field of energy exchange equipment technology, specifically to a high-efficiency and energy-saving combined heat exchange device. Background Technology

[0002] Heat exchangers are core components of energy conversion and utilization systems, and are widely used in refrigeration, air conditioning, power generation, chemical industry, metallurgy, electronic equipment cooling, and new energy vehicles. Their basic function is to achieve efficient heat transfer between fluids at different temperatures without directly mixing these fluids.

[0003] Currently, the most common heat exchanger is the plate heat exchanger, a high-efficiency heat exchange device composed of a series of corrugated metal plates. Fluid flows through channels between adjacent plates, exchanging heat through the plates. It is widely used in HVAC, food and beverage, chemical, and power industries. Plate heat exchangers are compact and easy to maintain; however, they have low pressure resistance, large pressure drop, and require numerous gaskets for sealing, making high sealing difficult and prone to leakage. They are particularly unsuitable for gas-to-gas heat exchange. Therefore, existing heat exchange devices require further improvement. Utility Model Content

[0004] The purpose of this utility model is to provide a high-efficiency and energy-saving combined heat exchange device to solve the existing technical problems in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a high-efficiency and energy-saving combined heat exchange device is provided, including at least a first heat exchanger and a second heat exchanger. The first heat exchanger includes a heat exchange channel and a cooling channel. The heat exchange channel is disposed inside the first heat exchanger and allows substances to flow from top to bottom along the heat exchange channel. The cooling channel is sleeved on the outside of the heat exchange channel, and a cooling medium circulates from bottom to top in the cooling channel. The second heat exchanger is connected in series at the end of the first heat exchanger and the two have the same structure. The second heat exchanger and the first heat exchanger are connected by a first diameter reducing assembly.

[0006] Based on the above technical solution, the first variable diameter assembly includes an output pipe, a first connecting pipe, and a second connecting pipe. One end of the output pipe is connected to the outlet of the heat exchange channel of the first heat exchanger, and the other end is connected to the inlet of the first connecting pipe and the inlet of the second connecting pipe. The outlet of the first connecting pipe is connected to the inlet of the heat exchange channel of the second heat exchanger, and the outlet of the second connecting pipe and the outlet of the heat exchange channel of the second heat exchanger are both connected to the first collecting pipe.

[0007] Based on the above technical solution, the diameter of the output tube is smaller than the diameters of the first connecting tube and the second connecting tube.

[0008] Based on the above technical solution, multiple second heat exchangers are provided, and the second heat exchangers are connected in series at the end of the first heat exchanger.

[0009] Based on the above technical solution, a third heat exchanger is also included, which is connected in series at the end of the second heat exchanger and has the same structure. The third heat exchanger and the second heat exchanger are connected by a second diameter-changing assembly, which has the same structure as the first diameter-changing assembly. The outlet of the first connecting pipe of the second diameter-changing assembly is connected to the inlet of the heat exchange channel of the third heat exchanger, the outlet of the second connecting pipe of the second diameter-changing assembly is connected to the first collecting pipe, and the outlet of the heat exchange channel of the third heat exchanger is connected to the second collecting pipe.

[0010] Based on the above technical solutions, the first collection tube and the second collection tube are arranged in parallel and are independent of each other, or the first collection tube and the second collection tube are connected in series and are interconnected.

[0011] Based on the above technical solutions, the circulating cooling media in the first heat exchanger, the second heat exchanger, and the third heat exchanger are different.

[0012] Based on the above technical solution, heat exchange plates are uniformly arranged in the heat exchange channel, and guide vanes are arranged between the heat exchange plates.

[0013] Based on the above technical solution, the heat exchange plates in the first heat exchanger are configured as herringbone corrugated plates, and the heat exchange plates in the second and third heat exchangers are configured as parallel corrugated plates.

[0014] Based on the above technical solution, temperature sensors are provided at the ends of both the first and second collection tubes.

[0015] The beneficial effects of the technical solution provided by this utility model are as follows: This invention provides a high-efficiency and energy-saving combined heat exchange device that can recover heat, reduce resource waste, and perform multi-stage cooling to condense one gaseous substance or separate multiple gaseous substances, enhancing the recovery rate of low-boiling-point substances and reducing external emissions. For the separation of waste liquid containing small amounts of light-boiling substances, staged cooling has a better separation effect. Specifically, the introduced substance is condensed through the heat exchange channel of the first heat exchanger. The condensed high-temperature substance then enters the heat exchange channel of the second heat exchanger after passing through the first diameter-reducing component, where it undergoes another step of condensation. The condensed liquid is collected separately or together, resulting in better separation and recovery. Attached Figure Description

[0016] Figure 1This is a schematic diagram of one possible structure of the heat exchange device of this utility model; Figure 2 This is another structural schematic diagram of the heat exchange device of this utility model; Detailed Implementation The present invention will be further described below with reference to the accompanying drawings and embodiments: In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0017] In the description of this utility model, it should be understood that the terms "left", "right", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] like Figures 1 to 2 As shown, a high-efficiency and energy-saving combined heat exchange device includes at least a first heat exchanger 1 and a second heat exchanger 2. The first heat exchanger 1 includes a heat exchange channel 11 and a cooling channel 12. The heat exchange channel 11 is disposed inside the first heat exchanger 1 and allows substances to flow from top to bottom along the heat exchange channel 11. The cooling channel 12 is sleeved on the outside of the heat exchange channel 11, and a cooling medium circulates from bottom to top in the cooling channel 12. The second heat exchanger 2 is connected in series at the end of the first heat exchanger 1 and the two have the same structure. The second heat exchanger 2 and the first heat exchanger 1 are connected by a first diameter reducing assembly 3.

[0019] This invention provides a high-efficiency and energy-saving combined heat exchange device that can recover heat, reduce resource waste, and perform multi-stage cooling to condense one gaseous substance or separate multiple gaseous substances, enhancing the recovery rate of low-boiling-point substances and reducing external emissions. For the separation of waste liquids containing small amounts of light-boiling substances, staged cooling has a better separation effect.

[0020] Specifically, the introduced substance is condensed through the heat exchange channel 11 of the first heat exchanger 1. The condensed high-temperature substance then enters the heat exchange channel of the second heat exchanger 2 after passing through the first diameter-reducing component, where it undergoes another condensation step. The condensed liquid is collected separately or together with the condensed liquid. More preferably, the number of second heat exchangers can be selected according to actual separation requirements to achieve better condensation or separation effects, while simultaneously achieving efficient heat recovery.

[0021] Based on the above technical solution, the first variable diameter assembly 3 includes an output pipe 31, a first connecting pipe 32, and a second connecting pipe 33. One end of the output pipe 31 is connected to the outlet of the heat exchange channel of the first heat exchanger 1, and the other end is connected to the inlet of the first connecting pipe 32 and the inlet of the second connecting pipe 33. The outlet of the first connecting pipe 32 is connected to the inlet of the heat exchange channel of the second heat exchanger 2. The outlet of the second connecting pipe 33 and the outlet of the heat exchange channel of the second heat exchanger 2 are both connected to the first collecting pipe 4.

[0022] Based on the above technical solution, the diameter of the output tube 31 is smaller than the diameters of the first connecting tube 32 and the second connecting tube 33.

[0023] By setting the diameters of the first connecting pipe 32 and the second connecting pipe 33 to be smaller than the diameter of the output pipe 31, the material flow rate will decrease after it is output from the output pipe and enters a pipe with a larger diameter during the material flow process, thereby increasing the heat exchange time and improving the heat exchange efficiency.

[0024] Based on the above technical solution, multiple second heat exchangers 2 are provided, and the second heat exchangers 2 are connected in series at the end of the first heat exchanger 1.

[0025] Preferably, multiple second heat exchangers 2 are provided, with multiple second heat exchangers 2 connected in series at the end of the first heat exchanger 1. The raw liquid (i.e., the liquid to be treated) is used for cooling and simultaneously preheated, thus recovering more than 50% of the heat. Multi-stage cooling is then achieved using ice water at 7-9°C and ethylene glycol as a refrigerant, with a temperature difference of more than 20°C below -15°C. This allows for the condensation of one gaseous substance and the separation of two gaseous substances or two mixed gases, enhancing the recovery rate of low-boiling-point substances and reducing emissions. Staged cooling is particularly practical for separating waste liquids containing small amounts of light-boiling substances.

[0026] Based on the above technical solution, a third heat exchanger 5 is also included, which is connected in series at the end of the second heat exchanger 2 and has the same structure. The third heat exchanger 5 and the second heat exchanger 2 are connected by a second diameter-changing assembly 6, which has the same structure as the first diameter-changing assembly 3. The outlet of the first connecting pipe of the second diameter-changing assembly 6 is connected to the inlet of the heat exchange channel of the third heat exchanger 5, the outlet of the second connecting pipe of the second diameter-changing assembly 6 is connected to the first collecting pipe 4, and the outlet of the heat exchange channel of the third heat exchanger 5 is connected to the second collecting pipe 7.

[0027] Based on the above technical solution, the first collection tube 4 and the second collection tube 7 are arranged in parallel and are independent of each other, or the first collection tube 4 and the second collection tube 7 are connected in series and are interconnected.

[0028] In a more preferred embodiment, a third heat exchanger 5 is connected in series at the end of the last second heat exchanger 2, which can achieve condensation and separation between two gaseous substances or gas mixtures in addition to multi-stage cooling.

[0029] Based on the above technical solution, the circulating cooling media in the first heat exchanger 1, the second heat exchanger 2, and the third heat exchanger 5 are different.

[0030] Preferably, the circulating cooling media in the first heat exchanger 1, the second heat exchanger 2, and the third heat exchanger 5 are different to achieve optimal heat collection and cooling effects. Specifically, the first heat exchanger 1, due to its higher temperature, is generally cooled by the raw liquid (the liquid being treated, at room temperature) to recover heat and increase the temperature of the raw liquid. The second heat exchanger 2 uses ice water (7-9°C), and the third heat exchanger 5 uses a refrigerant (such as ethylene glycol, -15°C) to achieve optimal collection effects.

[0031] The heat exchange device in this application has two specific implementations, corresponding to the separation and condensation of different substances. Taking a device containing three heat exchangers as an example, the specific implementations are described below: In one preferred embodiment, when condensing and separating a gaseous substance, if the condensation temperature difference between the two solvents is greater than 10 degrees Celsius, the two gaseous solvents are separated by precisely controlling the flow rate and temperature of the coolant. The heat exchange device includes a first heat exchanger 1, a second heat exchanger 2, and a third heat exchanger 5. The gaseous substance enters from the inlet of the heat exchange channel 31 of the first heat exchanger 1, and then flows out from the outlet of the heat exchange channel, passing through the reducing assembly and flowing backward. Specifically, the gaseous substance that has undergone one condensation and becomes liquid flows into the second connecting pipe 33 and flows backward, through the first collecting pipe 4 and into the collecting tank. The gaseous portion flows into the heat exchange channel of the second heat exchanger 2 through the first connecting pipe 4 for further condensation. This process continues, and the substance flowing out of the second heat exchanger 2 flows into the third heat exchanger 5. Finally, the liquids after condensation, along with the liquids condensed by the first and second heat exchangers 1 and 2, flow into the collecting tank.

[0032] In another preferred embodiment, when condensing and separating two different gaseous substances or two mixed gases, the heat exchange device 3 includes a first heat exchanger 1 (cooled by ambient temperature raw liquid), a second heat exchanger 2 (cooled by ice water), and a third heat exchanger 5 (cooled by refrigerant such as ethylene glycol). Due to the large temperature difference among the three refrigerants, the mixed substance enters from the inlet of the heat exchange channel of the first heat exchanger 1 and then flows out from the outlet of the heat exchange channel, passing through the first diameter-reducing component 3. Specifically, the gaseous substance that has undergone one condensation and becomes liquid flows into the second connecting pipe 33 and then into the first collecting pipe 4. The gaseous part flows into the heat exchange channel of the second heat exchanger 2 through the first connecting pipe 32 for further condensation. The liquid flowing out from the outlet of the second connecting pipe of the second diameter-reducing component 6 enters the first collecting pipe and flows out, thus realizing the condensation of one gaseous or gaseous substance. The other substance then enters the heat exchange channel of the third heat exchanger, flows out from the outlet of the heat exchange channel of the third heat exchanger, and enters the second collecting pipe. That is, the first collecting pipe and the second collecting pipe collect the two liquids that have achieved condensation and separation. More preferably, if the second substance requires further cooling, an additional heat exchanger can be connected in series at the end of the third heat exchanger to achieve a better condensation effect.

[0033] Based on the above technical solution, heat exchange plates are uniformly arranged in the heat exchange channel, and guide vanes are arranged between the heat exchange plates.

[0034] Preferably, guide vanes are provided between the heat exchange plates to guide the fluid to flow along a spiral path, thereby extending the heat exchange time.

[0035] Based on the above technical solution, the heat exchange plates in the first heat exchanger 1 are configured as herringbone corrugated plates, and the heat exchange plates in the second heat exchanger 2 and the third heat exchanger 5 are configured as parallel corrugated plates.

[0036] More preferably, the first heat exchanger 1 uses herringbone corrugated plates to enhance turbulence intensity and improve heat exchange efficiency; the second heat exchanger 2 and the third heat exchanger 5 use parallel corrugated plates to reduce secondary pressure drop.

[0037] Based on the above technical solution, temperature sensors are provided at the ends of the first collection tube 4 and the second collection tube 7.

[0038] Preferably, a temperature sensor is installed to detect the temperature of the condensate outlet, which facilitates the control of the coolant flow rate, thereby reducing the overcooling and overheating of the condensate and achieving an efficient and stable heat exchange process.

[0039] The foregoing has shown and described the basic principles and main features of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments. Therefore, the embodiments should be regarded as exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this utility model.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-efficiency and energy-saving combined heat exchange device, characterized in that, The system includes at least a first heat exchanger (1) and a second heat exchanger (2). The first heat exchanger (1) includes a heat exchange channel (11) and a cooling channel (12). The heat exchange channel (11) is located inside the first heat exchanger (1) and allows substances to flow from top to bottom along the heat exchange channel (11). The cooling channel (12) is sleeved on the outside of the heat exchange channel (11), and a cooling medium circulates from bottom to top in the cooling channel (12). The second heat exchanger (2) is connected in series at the end of the first heat exchanger (1) and the two have the same structure. The second heat exchanger (2) and the first heat exchanger (1) are connected in series. The heat exchangers (1) are connected by a first variable diameter assembly (3); the first variable diameter assembly (3) includes an output pipe (31), a first connecting pipe (32) and a second connecting pipe (33). One end of the output pipe (31) is connected to the heat exchange channel outlet of the first heat exchanger (1), and the other end is connected to the inlet of the first connecting pipe (32) and the second connecting pipe (33) respectively. The outlet of the first connecting pipe (32) is connected to the heat exchange channel inlet of the second heat exchanger (2), and the outlet of the second connecting pipe (33) and the outlet of the heat exchange channel of the second heat exchanger (2) are both connected to the first collecting pipe (4).

2. The high-efficiency energy-saving combined heat exchange device according to claim 1, characterized in that, The diameter of the output tube (31) is smaller than the diameters of the first connecting tube (32) and the second connecting tube (33).

3. The high-efficiency energy-saving combined heat exchange device according to claim 1, characterized in that, Multiple second heat exchangers (2) are provided, and the second heat exchangers (2) are connected in series at the end of the first heat exchanger (1).

4. The high-efficiency energy-saving combined heat exchange device according to claim 1, characterized in that, It also includes a third heat exchanger (5) connected in series at the end of the second heat exchanger (2) and having the same structure. The third heat exchanger (5) and the second heat exchanger (2) are connected by a second diameter-changing assembly (6). The second diameter-changing assembly (6) has the same structure as the first diameter-changing assembly (3). The outlet of the first connecting pipe of the second diameter-changing assembly (6) is connected to the inlet of the heat exchange channel of the third heat exchanger (5). The outlet of the second connecting pipe of the second diameter-changing assembly (6) is connected to the first collecting pipe (4). The outlet of the heat exchange channel of the third heat exchanger (5) is connected to the second collecting pipe (7).

5. The high-efficiency energy-saving combined heat exchange device according to claim 4, characterized in that, The first collection tube (4) and the second collection tube (7) are arranged in parallel and are independent of each other, or the first collection tube (4) and the second collection tube (7) are connected in series and are interconnected.

6. The high-efficiency energy-saving combined heat exchange device according to claim 4, characterized in that, The circulating cooling media in the first heat exchanger (1), the second heat exchanger (2), and the third heat exchanger (5) are different.

7. The high-efficiency energy-saving combined heat exchange device according to claim 4, characterized in that, The heat exchange channel is uniformly provided with heat exchange plates, and guide vanes are provided between the heat exchange plates.

8. The high-efficiency energy-saving combined heat exchange device according to claim 7, characterized in that, The heat exchange plates in the first heat exchanger (1) are herringbone corrugated plates, and the heat exchange plates in the second heat exchanger (2) and the third heat exchanger (5) are parallel corrugated plates.

9. The high-efficiency energy-saving combined heat exchange device according to claim 4, characterized in that, Temperature sensors are provided at the ends of the first collecting tube (4) and the second collecting tube (7).

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