Novel efficient heat transfer condenser

Abstract

The utility model discloses a novel efficient heat transfer condenser which comprises a condenser body, the condenser body comprises a cylinder body fixed on a support, and two sides of the top of the cylinder body are respectively connected with a liquid inlet pipe and a liquid outlet pipe. The heat exchanger comprises a barrel, two tube nest groups are obliquely arranged in the barrel in a crossed manner, each tube nest group comprises a plurality of tubes which are obliquely arranged, heat-conducting fins are spirally fixed on the outer side walls of the tubes, and the heat-conducting fins of the adjacent tubes are spirally arranged in a staggered manner, so that the two tube nest groups are obliquely arranged in a crossed manner, the flowing path of a refrigerant in the tubes is more complicated, and the heat exchange efficiency of the heat exchanger is improved. According to the condenser, fluid disturbance is increased, a flowing dead zone is reduced, so that the heat transfer coefficient of a refrigerant and the inner walls of the tube nests is increased, meanwhile, the contact area of condensate and the heat conducting fins is greatly increased through the heat conducting fins which are spirally fixed to the outer side walls of the tube nests and are adjacent and staggered, heat can be more effectively transferred between the refrigerant and the condensate, and compared with a traditional condenser, the heat transfer efficiency is improved. And the heat transfer efficiency is greatly improved.

Description

Technical fields:

[0001] This utility model relates to the field of condenser technology, specifically to a novel high-efficiency heat transfer condenser. Background technology:

[0002] In air separation equipment, the extraction process of liquid nitrogen relies on efficient heat exchange equipment, and the condenser, as a key component, directly affects the energy consumption, efficiency, and quality of the entire air separation system.

[0003] In traditional air separation liquid nitrogen extraction systems, the condensers typically employ a conventional tube-and-shell structure. The tubes are usually arranged in parallel or simple staggered configurations within the cylinder, and the heat-conducting fins on the outside of the tubes are also relatively simple, generally evenly distributed with no misalignment between adjacent tubes. This structure results in a limited contact area between the refrigerant (such as nitrogen) and the condensate (the medium that needs to be condensed during air separation), leading to low heat exchange efficiency. Utility Model Content:

[0004] Therefore, this utility model provides a novel high-efficiency heat transfer condenser to overcome the problems of the prior art.

[0005] This utility model is implemented by the following technical solution:

[0006] A novel high-efficiency heat transfer condenser includes a condenser body, which comprises a cylinder fixed on a support. An inlet pipe and an outlet pipe are connected to the top two sides of the cylinder, respectively. Two sets of tube arrays are arranged obliquely and crosswise within the cylinder. Each set of tube arrays includes multiple obliquely arranged tubes. Heat-conducting fins are spirally fixed to the outer wall of each tube array, with the heat-conducting fins of adjacent tubes spirally staggered. End-face pipes are connected to both ends of the cylinder via flanges, and refrigerant inlets and outlets are respectively provided on the end-face pipes. The two sets of tube arrays are fixedly connected to end plates at both ends and pass through the end plates to communicate with the end-face pipes. The end plates are fixed to both sides of the cylinder. The inner diameter of the tube arrays gradually decreases from the inlet end to the outlet end.

[0007] Preferably, the inclination angle of the tubes is 30°-60° with the axis of the cylinder.

[0008] Preferably, the heat-conducting sheet is welded and fixed to the outer wall of the tube by spiral winding, the heat-conducting sheets of adjacent tubes are staggered in the circumferential position, and the spiral pitch is 1.2-1.5 times the outer diameter of the tube.

[0009] Preferably, the end face pipe is fixedly connected to the cylinder by flanges and bolts, the refrigerant inlet is provided at the top of the left end face pipe, and the refrigerant outlet is provided at the bottom of the right end face pipe.

[0010] Preferably, the sealing plate is made by integral forging and is subjected to helium mass spectrometry leak detection after being welded to the cylinder to ensure airtightness.

[0011] Preferably, the inner diameter of the inlet end of the tube is larger than the inner diameter of the outlet end, forming a reduced diameter structure. The reduction ratio is optimized according to the refrigerant flow rate and pressure drop requirements, so that the refrigerant forms a velocity gradient in the tube.

[0012] The advantages of this invention are: the two sets of tubes are arranged at an angle and cross each other, which makes the flow path of the refrigerant in the tubes more complex, increases the turbulence of the fluid, reduces the dead zone of the flow, and thus improves the heat transfer coefficient between the refrigerant and the inner wall of the tubes. At the same time, the spirally fixed and adjacently staggered heat-conducting fins on the outer wall of the tubes greatly increase the contact area between the condensate and the heat-conducting fins, so that heat can be transferred more effectively between the refrigerant and the condensate. Compared with traditional condensers, the heat transfer efficiency is greatly improved. Attached image description:

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure described in this utility model;

[0015] Figure 2 This is a partial structural diagram of the present invention.

[0016] In the diagram: 1. End face pipe, 2. Refrigerant inlet, 3. Refrigerant outlet, 4. Cylinder, 5. Liquid inlet pipe, 6. Liquid outlet pipe, 7. Tubes, 8. Heat-conducting fins. Detailed implementation method:

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1 , Figure 2As shown, the high-efficiency heat transfer condenser includes a condenser body, the core component of which is a cylinder 4 fixed on a support. An inlet pipe 5 and an outlet pipe 6 are connected to the top two sides of the cylinder 4 by welding or other fixing methods. The inlet pipe 5 is used to input condensate into the cylinder 4, while the outlet pipe 6 is responsible for discharging the condensate after heat transfer.

[0019] Inside the cylinder 4, two sets of tube groups are arranged at an angle and cross each other. Each set of tube groups contains multiple tubes 7 arranged at an angle. The angle of the tubes 7 can be optimized according to the actual fluid flow and heat transfer requirements. For example, it can form a certain angle with the axis of the cylinder 4 (such as 30°-60°) to ensure that the refrigerant can generate good turbulence when flowing in the tubes and enhance the heat transfer effect.

[0020] Heat-conducting plates 8 are fixed on the outer wall of the tube 7 by spiral winding and welding. The heat-conducting plates 8 are tightly attached to the outer wall of the tube 7 to ensure good thermal conductivity.

[0021] The heat-conducting plates 8 of adjacent tubes 7 are arranged in a spiral staggered manner. That is, when viewed along the axial direction of the tubes, the heat-conducting plates on adjacent tubes are staggered in the circumferential position, which avoids the overlap of the heat-conducting plates and increases the contact area and contact opportunity between the condensate and the heat-conducting plates.

[0022] The cylinder 4 is fixedly connected to the end face pipe 1 at both ends by flanges and bolts. The end face pipe 1 is connected by flanges for easy disassembly and maintenance. The top of the left end face pipe 1 is fixedly connected to the refrigerant inlet 2, and the bottom of the right end face pipe 1 is fixedly connected to the refrigerant outlet 3. Nitrogen can be introduced into the left end face pipe 1 through the refrigerant inlet 2 and distributed through the two sets of tube groups connected on the sealing plate. During the flow of the two sets of tube groups, heat is transferred with the condensate. Finally, it enters the right end face pipe 1 and is discharged from the refrigerant outlet 3.

[0023] The two sets of tubes are fixedly connected to the end plates at both ends and are connected to the end face pipe 1 through the end plates. The end plates are fixed on both sides of the cylinder 4. The end plates are made by integral forging process and are welded to the cylinder 1 and then leak-tested by helium mass spectrometry to ensure airtightness.

[0024] The inner diameter of tube 7 adopts a gradual design, with the inner diameter of its inlet end (the end connected to pipe 1 on the left end face) being larger than that of its outlet end (the end connected to pipe 1 on the right end face), forming a tapered structure that gradually decreases in diameter from the inlet end to the outlet end. The specific tapering ratio can be optimized according to the refrigerant flow rate and pressure drop requirements to create a velocity gradient for the refrigerant within the tube.

[0025] Actual work process:

[0026] When the air separation system is running, nitrogen, as the refrigerant, enters the left end face pipe 1 from the refrigerant inlet 2 on the left. Since the two sets of tube bundles connected to the end face pipe 1 are in communication with each other on the sealing plate, the nitrogen is distributed into the two sets of inclined and cross-shaped tube bundles under pressure.

[0027] Nitrogen flows in an inclined direction inside tube 7. Since the tube assembly is arranged at an inclined and cross angle, the flow direction of nitrogen will change continuously during the flow process, thereby increasing the flow path and the degree of disturbance in the tube, which is beneficial to improving the heat exchange efficiency with the condensate outside the tube.

[0028] As the inner diameter of tube 7 gradually decreases from the inlet to the outlet, the refrigerant nitrogen gas generates a gradually narrowing flow channel effect during flow: as the cross-sectional area of ​​the flow channel decreases, the nitrogen gas velocity gradually increases, forming a flow state with a higher degree of turbulence. This velocity change not only enhances the convective heat transfer between the refrigerant and the inner wall of the tube, but also causes the condensate on the outside of the tube to form more intense disturbances on the surface of the heat-conducting plate 8 through the change of fluid shear force, further enhancing the interphase heat transfer.

[0029] The condensate enters the interior of the cylinder 4 through the inlet pipe 5 at the top of the cylinder 4, and flows downward along the inner wall of the cylinder 4 and around the tube assembly under the action of gravity and fluid flow.

[0030] Because the heat-conducting plates 8, which are spirally fixed on the outer wall of the tube 7, are in direct contact with the condensate, and the heat-conducting plates 8 of adjacent tubes 7 are spirally staggered, the condensate can fully contact the heat-conducting plates 8 during the flow process, increasing the area and time of heat exchange.

[0031] When nitrogen flows inside tube 7, the heat (or cooling capacity, depending on the specific requirements of the air separation process) it carries is transferred through the tube wall of tube 7 to the heat-conducting plate 8, and then transferred by the heat-conducting plate 8 to the surrounding condensate, or vice versa (depending on the direction of heat transfer), thereby realizing the heat exchange between the refrigerant and the condensate.

[0032] After sufficient heat exchange, the nitrogen gas changes temperature and flows out of tube 7 into the right-side end pipe 1, and is discharged from the refrigerant outlet 3 at the bottom of the right-side end pipe 1, entering the subsequent air separation process. The condensate, after completing heat transfer, also changes temperature accordingly and is discharged from the liquid outlet pipe 6 at the bottom of the cylinder 4 for subsequent processing or utilization.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel high-efficiency heat transfer condenser, comprising a condenser body, characterized in that: The condenser body includes a cylinder (4) fixed on a support. The top two sides of the cylinder (4) are respectively connected to an inlet pipe (5) and an outlet pipe (6). Two sets of tube groups are arranged obliquely and crosswise inside the cylinder (4). Each set of tube groups includes multiple obliquely arranged tubes (7). Heat-conducting plates (8) are spirally fixed on the outer wall of the tubes (7). The heat-conducting plates (8) of adjacent tubes (7) are spirally staggered. The two ends of the cylinder (4) are connected to end face pipes (1) through flanges. The end face pipes (1) are respectively provided with a refrigerant inlet (2) and a refrigerant outlet (3). The two sets of tube groups are fixedly connected to the end face pipes (1) through the end face pipes (1). The end face pipes (1) are fixed on both sides of the cylinder (4). The inner diameter of the tubes (7) gradually decreases from the input end to the output end.

2. The high-efficiency heat transfer condenser according to claim 1, characterized in that: The inclination angle of the tube (7) is 30°-60° with the axis of the cylinder (4).

3. The high-efficiency heat transfer condenser according to claim 1, characterized in that: The heat-conducting plate (8) is welded and fixed to the outer wall of the tube (7) by spiral winding. The heat-conducting plates (8) of adjacent tubes (7) are staggered in the circumferential position, and the spiral pitch is 1.2-1.5 times the outer diameter of the tube.

4. The high-efficiency heat transfer condenser according to claim 1, characterized in that: The end face pipe (1) is fixedly connected to the cylinder (4) by flanges and bolts. The refrigerant inlet (2) is provided at the top of the end face pipe (1) on the left side, and the refrigerant outlet (3) is provided at the bottom of the end face pipe (1) on the right side.

5. The high-efficiency heat transfer condenser according to claim 1, characterized in that: The sealing plate is made by integral forging process and is welded to the cylinder (4) and then subjected to helium mass spectrometry leak detection to ensure airtightness.

6. The high-efficiency heat transfer condenser according to claim 1, characterized in that: The inner diameter of the inlet end of the tube (7) is larger than the inner diameter of the outlet end, forming a reduced diameter structure. The reduction ratio is optimized according to the refrigerant flow rate and pressure drop requirements, so that the refrigerant forms a velocity gradient in the tube.

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