Novel helium water cooler for high-temperature gas cooled reactor driving motor

Abstract

The invention discloses a novel helium water cooler for a high-temperature gas cooled reactor driving motor, which relates to the field of high-temperature cooling, and comprises transverse cooling pipes and longitudinal cooling pipes which are arranged in a shell in an alternate array offset manner, and the outer walls of the transverse cooling pipes and the longitudinal cooling pipes are circular; longitudinal fins are symmetrically arranged on the circular outer wall in an array mode in the clockwise direction, porous baffles are further arranged in the shell, and the porous baffles are symmetrically and alternately arranged on the two sides of the helium inlet and the two sides of the helium outlet. According to the cooler, water flows in the cooling pipes and exchanges heat with helium through the longitudinal finned tubes, the outflow temperature and the inflow temperature of the water are within the range of three DEG C through finite element analysis analogue simulation, it is ensured that the cooling water can be reused, the heat exchange rate of the helium can reach 98% under a certain condition, and the high efficiency shows that the cooler is excellent in the heat exchange process.

Description

Technical Field

[0001] The present invention relates to the field of high-temperature cooling, and in particular to a novel helium-water cooler for a high-temperature gas-cooled reactor driving motor. Background Art

[0002] As the only temperature control unit for the working space of the high-temperature gas-cooled reactor working medium driving motor, accurately identifying its operating state and timely regulating it is an important guarantee for maintaining the stability of the working chamber environment temperature. Due to the structural requirements of the high-temperature gas-cooled reactor driving motor, the helium-water heat exchanger can only be designed in a limited space. The direct cycle of the helium turbine relies on an efficient heat exchanger, and its heat transfer efficiency. Therefore, the helium recuperator is an important technical difficulty, and at present, plate-fin recuperators are mostly used. However, the disadvantages of the plate-fin recuperator are as follows: 1. The manufacturing process requirements of the plate-fin heat exchanger are strict, and the process is complex. This is mainly because its structure is compact and requires high-precision processing and welding technologies to ensure the performance and reliability of the heat exchanger; 2. Due to the small fin pitch and small flow channels of the plate-fin heat exchanger, it is easy to be blocked. Once blocked, it is very difficult to clean and maintain, which will cause serious consequences. 3. Due to its flow channel design, its pressure drop is large, which to a certain extent affects the fluid flow efficiency. Therefore, a novel helium-water cooler for a high-temperature gas-cooled reactor driving motor is provided to solve the above problems. Summary of the Invention

[0003] To solve the above problems, the present invention provides a novel helium-water cooler for a high-temperature gas-cooled reactor driving motor. By symmetrically arranging 8 longitudinal fins in an array on the outer wall of the tube, the heat transfer area is significantly increased. The longitudinal fins and the cooling tube are of an integral structure, there is no problem of fin welding, and there is no need to worry about phenomena such as fin corrosion and cracking, and its heat transfer efficiency will not be reduced due to this. From the perspective of the helium flow characteristics, due to the guiding effect of the longitudinal fins, the helium can maintain a relatively uniform flow velocity distribution on the tube, which helps to avoid the problem of uneven heat transfer caused by too high or too low local flow velocity, thereby improving the overall heat transfer efficiency; the presence of the longitudinal fins will increase the turbulence degree of the fluid, destroy the boundary layer, and enhance the convective heat transfer. When the helium flows between the fins, due to the local resistance of the fins, the pressure of the fluid decreases and energy is lost, but at the same time, the heat transfer is promoted; the compact design of the longitudinal fin tube makes the volume of the heat exchanger smaller, and higher heat transfer performance can be achieved in a limited space.

[0004] To achieve the above object, the present invention provides a novel helium-water cooler for a high-temperature gas-cooled reactor driving motor, which includes transverse cooling tubes and longitudinal cooling tubes arranged alternately and offset in an array inside the housing. The outer walls of the transverse cooling tubes and the longitudinal cooling tubes are both circular, and longitudinal fins are symmetrically arranged in an array along the clockwise direction on the circular outer walls. A porous baffle is also arranged inside the housing, and the porous baffles are symmetrically and alternately arranged on both sides of the helium inlet and the helium outlet.

[0005] Preferably, 63 cooling tubes are arranged inside the housing. Among them, the horizontal cooling tubes are arranged in an alternating array offset pattern of 5 horizontal tubes and 4 horizontal tubes, and the vertical cooling tubes are arranged in 14 groups. 8 longitudinal fins are arranged on the outer walls of the horizontal cooling tubes and the vertical cooling tubes, and liquid water is filled inside. The water flow direction is from left to right.

[0006] Preferably, helium inlets are arranged at both the left and right ends of the bottom of the housing, 6 porous baffles are provided, and a helium outlet is arranged in the middle of the housing.

[0007] Preferably, the longitudinal fins and the horizontal cooling tubes and the vertical cooling tubes are of an integrally formed structure.

[0008] Preferably, the 6 porous baffles are symmetrically distributed around the helium inlets, with 2 above the helium inlets and 4 below the helium inlets.

[0009] Therefore, the present invention adopts the above-mentioned novel helium-water cooler for a high-temperature gas-cooled reactor drive motor, and has the following beneficial effects:

[0010] (1) By symmetrically arranging 8 longitudinal fins on the outer wall of the tube in an array pattern, the present invention significantly increases the heat transfer area. The longitudinal fins and the cooling tubes are of an integral structure, there is no problem of fin welding, and there is no need to worry about phenomena such as fin corrosion and cracking, and its heat transfer efficiency will not be reduced due to this.

[0011] (2) From the perspective of the helium flow characteristics, due to the guiding effect of the longitudinal fins, the helium can maintain a relatively uniform flow velocity distribution on the tube, which helps to avoid the problem of uneven heat transfer caused by too high or too low local flow velocity, thereby improving the overall heat transfer efficiency; the presence of the longitudinal fins will increase the turbulence degree of the fluid, break the boundary layer, and enhance the convective heat transfer. When the helium flows between the fins, due to the local resistance of the fins, the pressure of the fluid decreases and energy is lost, but at the same time, it also promotes the heat transfer; the compact design of the longitudinal fin tube makes the heat exchanger smaller in volume and can achieve higher heat transfer performance in a limited space.

[0012] (3) In the present invention, the porous baffles can effectively guide the flow direction of the helium, form a relatively stable flow path in the heat exchanger, evenly distribute the fluid throughout the heat exchanger, and avoid the problem of uneven heat transfer caused by too high or too low local flow velocity; the multi-baffle design can also enhance the turbulence degree of the fluid, break the boundary layer, and further improve the heat transfer efficiency; the presence of the baffles can also prevent fluid short-circuiting, reduce the pressure drop, ensure that the fluid is fully heat-exchanged in the cooler; at the same time, the baffles also have the advantage of supporting the longitudinal fin tubes, providing structural support, enhancing the mechanical stability of the cooler, preventing the heat exchange tubes from deforming or being damaged in a high-temperature and high-pressure environment, and facilitating subsequent cleaning and maintenance; the multi-baffle design can enhance the anti-vibration performance and can effectively reduce the vibration caused by fluid flow.

[0013] (4) In the present invention, the multi-baffle design and the structure of the longitudinal finned tubes are relatively simple, which are easy to manufacture and process. The longitudinal fins and the cooling tubes can be manufactured through processes such as stamping and welding, and the porous baffles can be processed through processes such as cutting and bending, which simplifies the manufacturing process and reduces the manufacturing cost.

[0014] (5) The porous baffle design in the present invention can effectively reduce the vibration caused by fluid flow and improve the anti-vibration performance of the cooler. The structural design between the longitudinal fins and the cooling tubes makes them more stable during the fluid flow process, reducing the impact of vibration on the cooler. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a novel helium-water cooler for a high-temperature gas-cooled reactor drive motor according to the present invention.

[0016] Figure 2 It is a schematic diagram of the internal structure of the helium-water cooler housing.

[0017] Figure 3 It is a schematic diagram of the arrangement of the cooling tubes of the helium-water cooler.

[0018] Figure 4 It is a schematic diagram of the single-tube structure of the cooling tube.

[0019] Figure 5 It is a schematic diagram of the arrangement of the longitudinal fins of the single cooling tube.

[0020] Reference Numerals: 1, single cooling tube with longitudinal fins; 2, upper porous baffle 2-1, lower porous baffle 2-2; 3, left helium gas inlet 3-1, right helium gas inlet 3-2; 4, helium gas outlet. Detailed Description of the Invention

[0021] The present invention will be described in detail below with reference to the accompanying drawings.

[0022] Unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs.

[0023] In the present invention, words such as "including" or "comprising" mean that the elements before this word cover the elements listed after this word, and do not exclude the possibility of also covering other elements. The orientation or positional relationship indicated by terms such as "inside", "outside", "above", "below", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. In the present invention, unless otherwise clearly specified and limited, terms such as "attachment" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The structure of the helium-water cooler for the novel high-temperature gas-cooled reactor drive motor is as Figure 1 shown, including transverse cooling tubes and longitudinal cooling tubes arranged alternately and offset in an array inside the housing. The outer walls of the transverse cooling tubes and the longitudinal cooling tubes are both circular. Longitudinal fins are symmetrically arranged in an array along the clockwise direction on the circular outer walls. A porous baffle is also arranged inside the housing, and the porous baffles are symmetrically and alternately arranged on both sides of the helium inlet and the helium outlet. From the perspective of the helium flow characteristics, due to the guiding effect of the longitudinal fins, the helium can maintain a relatively uniform flow velocity distribution on the tubes, which helps to avoid the problem of uneven heat transfer caused by too high or too low local flow velocity, thereby improving the overall heat transfer efficiency; the presence of the longitudinal fins will increase the turbulence degree of the fluid, break the boundary layer, and enhance the convective heat transfer. When the helium flows between the fins, due to the local resistance of the fins, the pressure of the fluid decreases and energy is lost, but at the same time, the heat transfer is promoted; the compact design of the longitudinal fin tubes makes the heat exchanger smaller in volume and can achieve higher heat transfer performance in a limited space.

[0025] The internal structure of the housing is as Figure 2 shown. In this embodiment, 63 cooling tubes are arranged inside the housing. Among them, the transverse cooling tubes are arranged alternately and offset with 5 in the transverse direction and 4 in the transverse direction. The longitudinal cooling tubes are arranged in 14 groups. 8 longitudinal fins are arranged on the outer walls of the transverse cooling tubes and the longitudinal cooling tubes. Liquid water is filled inside, and the water flow direction is from left to right. The tube structure is as Figure 4 shown, and the distribution of the longitudinal fins on the tube body is as Figure 5As shown. In this embodiment, it is ensured that the outflow temperature of water is within 3 degrees of the inflow temperature. The cooling water can be reused, reducing the demand for fresh water resources, lowering the operating cost, and having a positive significance for environmental protection. The longitudinal fins and the transverse cooling tubes and the longitudinal cooling tubes are of an integrally formed structure, manufactured by processes such as stamping and welding. There is no problem with the welding of the fins, and there is no need to worry about phenomena such as fin corrosion and cracking, and its heat transfer efficiency will not be reduced due to this.

[0026] In this embodiment, helium inlets are provided at both the left and right ends of the bottom of the shell. There are 6 porous baffles, and a helium outlet is provided in the middle of the shell. The 6 porous baffles are symmetrically distributed around the helium inlet, with 2 above the helium inlet and 4 below the helium inlet. The porous baffles can effectively guide the flow direction of helium, form a relatively stable flow path in the heat exchanger, evenly distribute the fluid throughout the heat exchanger, and avoid problems of uneven heat transfer caused by too high or too low local flow velocity; the multi-baffle design can also enhance the turbulence degree of the fluid, break the boundary layer, and further improve the heat transfer efficiency; the presence of the baffles can also prevent fluid short-circuiting, reduce the pressure drop, and ensure that the fluid is fully heat-exchanged in the cooler; at the same time, the baffles also have the advantage of supporting the longitudinal fin tubes, providing structural support, enhancing the mechanical stability of the cooler, preventing the heat exchange tubes from deforming or being damaged in a high-temperature and high-pressure environment, and facilitating subsequent cleaning and maintenance; the multi-baffle design can enhance the anti-vibration performance and effectively reduce the vibration caused by fluid flow.

[0027] Working principle:

[0028] The cooler includes 63 cooling tubes arranged inside the shell. The cooling tubes specifically include 5 and 4 alternately arrayed and offset transverse cooling tubes and 14 groups of longitudinal cooling tubes. There are 8 longitudinal fins symmetrically arrayed in a clockwise direction on the outer wall of each tube. The cooling fluid, liquid water, flows in from the left and out from the right. There are also 6 porous baffles arranged inside the shell, symmetrically and alternately arranged on both sides of the helium inlet and the helium outlet. Helium enters from the helium inlets at both the left and right ends of the bottom, and after being guided by the porous baffles, is evenly distributed inside the shell and finally flows out from the helium outlet in the middle. The water flows in the fin tubes and exchanges heat with the helium through the longitudinal fin tubes. Through finite element analysis and simulation, it is obtained that the outflow temperature of water is within three degrees Celsius of the inflow temperature, ensuring that the cooling water can be reused. At the same time, the heat exchange efficiency of helium can reach 98% under certain conditions. The structure of the cooler is designed compactly, with a small volume, and the weight of the entire heat exchanger is relatively light, facilitating installation and maintenance. High-efficiency heat exchange performance is achieved in a limited space, with a compact structure, high reliability, energy conservation and environmental protection.

[0029] Therefore, the present invention adopts the above-mentioned novel helium-water cooler for the drive motor of a high-temperature gas-cooled reactor. By symmetrically arranging 8 longitudinal fins in an array on the outer wall of the tube, the heat transfer area is significantly increased. The longitudinal fins and the cooling tube are of an integral structure, eliminating the problem of fin welding. There is no need to worry about phenomena such as fin corrosion and cracking, and the heat transfer efficiency will not be reduced due to this. From the perspective of the helium flow characteristics, due to the guiding effect of the longitudinal fins, the helium can maintain a relatively uniform flow velocity distribution on the tube, which helps to avoid the problem of uneven heat transfer caused by too high or too low local flow velocity, thereby improving the overall heat transfer efficiency. The presence of the longitudinal fins will increase the turbulence degree of the fluid, break the boundary layer, and enhance the convective heat transfer. When the helium flows between the fins, due to the local resistance of the fins, the pressure of the fluid decreases and energy is lost, but at the same time, the heat transfer is promoted. The compact design of the longitudinal fin tube makes the heat exchanger smaller in volume and enables higher heat transfer performance in a limited space.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A new type of helium water cooler for high temperature gas-cooled reactor drive motor, characterized by: The invention comprises transverse cooling tubes and longitudinal cooling tubes which are arranged in an alternating array and offset inside the shell. The outer walls of the transverse cooling tubes and the longitudinal cooling tubes are both circular. The longitudinal fins are arranged in a symmetrical array in a clockwise direction on the circular outer walls. A porous baffle is also arranged inside the shell. The porous baffle is symmetrically and alternately arranged on both sides of the helium inlet and the helium outlet.

2. A novel helium-water cooler for a high temperature gas-cooled reactor drive motor according to claim 1, characterized in that: There are 63 cooling tubes inside the shell, among which the transverse cooling tubes are arranged in an alternating array of 5 transverse tubes and 4 transverse tubes, and the longitudinal cooling tubes are arranged in 14 groups. Eight longitudinal fins are arranged on the outer walls of the transverse cooling tubes and the longitudinal cooling tubes. The inside is filled with liquid water, and the water flows from left to right.

3. According to the novel helium-water cooler for high temperature gas-cooled reactor drive motor as described in claim 1, it is characterized by: Helium inlets are arranged at both left and right ends of the bottom of the shell, 6 porous baffles are arranged, and a helium outlet is arranged in the middle of the shell.

4. According to the novel helium-water cooler for high temperature gas-cooled reactor drive motor as described in claim 1, it is characterized by: The longitudinal fins, the transverse cooling pipes and the longitudinal cooling pipes are formed as an integral structure.

5. According to the novel helium-water cooler for high temperature gas-cooled reactor drive motor as described in claim 3, it is characterized by: The six porous baffles are symmetrically distributed around the helium inlet, with two above and four below the helium inlet.

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