Efficient heat exchange device for valve and LNG low-temperature valve
By designing efficient heat exchange devices and multiple sealing structures in LNG low-temperature valves, the problems of material embrittlement, seal failure and leakage are solved, and higher heat transfer efficiency and safety are achieved.
Patent Information
- Application Number
- CN202421926292.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-08-09
AI Technical Summary
LNG low-temperature valves have problems such as material embrittlement, seal failure and operation difficulties in extremely low temperature environments, and traditional shut-off valves have a large number of sealing surfaces that are prone to LNG leakage.
An efficient heat exchange device is designed, including corrugated cooling fins and heat homogenizers, combined with a heat conducting medium, installed in the valve body and on the valve stem, forming a cavity to improve heat transfer efficiency, and reducing leakage risk through multiple sealing structures and flange connections.
It significantly improves the heat transfer efficiency of low-temperature valves, shortens the valve stem length, makes the valve smaller, has higher safety, lower processing costs, and effectively prevents LNG leakage.
Smart Images
Figure CN222798260U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of valves, and in particular to a high-efficiency heat exchange device for valves and an LNG low-temperature valve. Background Art
[0002] LNG is a clean and efficient energy source. During transportation and storage, it needs to remain in liquid state at extremely low temperatures. In order to ensure the safe and reliable operation of LNG under low temperature conditions, the valves used in the LNG system must have the characteristics of adapting to extremely low temperature environments. Such valves are called LNG cryogenic valves. In the -162℃ LNG cryogenic field, there are many types of complete process control valves, such as cryogenic ball valves, cryogenic stop valves, cryogenic butterfly valves, etc. Since LNG is in an extremely low temperature environment, ordinary valves will have problems such as material embrittlement, sealing failure and difficulty in operation under such conditions. Therefore, LNG cryogenic valves must have the following characteristics: Cryogenic valves must use materials with good low temperature toughness, such as stainless steel, aluminum alloy, nickel-based alloy, etc. These materials can still maintain good mechanical properties at low temperatures and will not rupture due to embrittlement. In order to prevent LNG leakage, cryogenic valves need to have excellent sealing performance. Sealing materials must also be resistant to low temperatures, such as polytetrafluoroethylene (PTFE), polyimide (PI), etc. Cryogenic stop valves are the main on-off valves of LNG pipelines. As an indispensable main equipment in a complete set of process equipment, they are generally connected to LNG pipelines by flanges. Since there is a temperature difference of about 200℃ between LNG and the outside world, the LNG in the cryogenic stop valve will often vaporize into NG, the main component of which is CH 4 However, traditional stop valves have a large number of sealing surfaces, which can easily cause LNG leakage. Utility Model Content
[0003] In order to overcome the above shortcomings, the present application provides a high-efficiency heat exchange device for a valve and an LNG cryogenic valve.
[0004] In a first aspect, a high-efficiency heat exchange device for a valve is provided, wherein the valve comprises a valve body and a valve stem, wherein the high-efficiency heat exchange device is arranged within the valve body, wherein the high-efficiency heat exchange device comprises corrugated cooling fins and a heat spreader, wherein the heat spreader is sleeved on the valve stem and forms a cavity with the inner wall of the valve body, wherein the cavity is filled with a heat-conducting medium, wherein the outer end of the corrugated cooling fin is fixed to the inner wall of the valve body, and the inner end is fixed to the heat spreader.
[0005] Optionally, the valve is a stop valve or a ball valve.
[0006] Optionally, the corrugated cooling fins are made of copper sheets or aluminum sheets.
[0007] In a second aspect, an LNG cryogenic valve is provided, which includes a valve stem and a lower valve body, an upper valve body and a valve opening and closing structure that are fixedly connected in sequence, the valve stem is inserted into the lower valve body and the upper valve body, and the extension and retraction of the valve stem is controlled by the valve opening and closing structure. A cavity is opened in the middle of the upper valve body, and a high-efficiency heat exchange device is installed in the cavity. The high-efficiency heat exchange device includes a corrugated cooling fin and a heat spreader. The heat spreader is sleeved on the valve stem and forms the cavity with the inner wall of the valve body. The cavity is filled with a heat-conducting medium. The outer end of the corrugated cooling fin is fixed to the inner wall of the cavity, and the inner end is fixed to the heat spreader.
[0008] Optionally, a sealing structure is installed between the valve stem and the lower valve body, and the sealing structure includes a plurality of layers of sealing rings, and a stuffing box is arranged between two adjacent layers of sealing rings.
[0009] Optionally, the lower end of the valve stem is a valve disc, and the conical sealing surface of the valve disc and the conical sealing surface in the middle of the lower valve body form the main sealing surface of the valve.
[0010] Optionally, the upper valve body and the lower valve body are connected by flange bolts to form a sealing surface.
[0011] Optionally, the corrugated cooling fins are made of copper sheets or aluminum sheets.
[0012] Optionally, a stuffing box sleeve is installed in the middle of the top of the lower valve body to press against the topmost sealing ring.
[0013] Optionally, the valve opening and closing structure includes: a bracket, a handwheel, a nut, a screw, a docking sleeve device, bolts, packing, a packing gland, and a pressure plate. One end of the bracket is fixed to the upper valve body, and the end is provided with a through hole for the valve stem to pass through. The nut is fixed to the other end of the bracket, and the screw is screwed on the nut. The handwheel is fixed to the outer end of the screw, and the inner end of the screw is connected to the valve stem through the docking sleeve device. The valve stem and the bracket paper are filled with packing, one end of the packing gland is against the packing, and the other end is against the pressure plate. The pressure plate is sleeved on the valve stem and fixed to the bracket by bolts.
[0014] The beneficial effects of this application are as follows:
[0015] According to the characteristic that the coldness of LNG cryogenic valve is transferred upward from the valve body, the utility model opens a cavity on the inner surface of the valve body and the middle part of the valve stem, and installs corrugated fins with large heat transfer coefficient and heat spreader with high diffusion capacity inside. The effective combination of the two significantly improves the heat transfer efficiency of the cryogenic valve. At the same time, a heat-conducting medium is added to the contact surface between the outer end of the corrugated fin and the wall surface to prevent the coldness from continuing to transfer upward and damaging the components and the sealing surface, thereby effectively shortening the length of the valve stem, making the LNG stop valve smaller in size, safer, and lower in processing and manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A 3D cross-sectional view of a high-efficiency heat exchange device for a valve provided in this embodiment.
[0017] Figure 2 A cross-sectional view of an LNG cryogenic valve provided in this embodiment.
[0018] The reference numerals in the figures are:
[0019] 1. Valve body; 2. Valve stem; 3. Corrugated cooling fins; 4. Heat spreader; 5. Cavity; 6. Lower valve body; 7. Upper valve body; 8. Inlet; 9. Outlet; 10. Sealing ring; 11. Stuffing box; 12. Valve disc; 13. Sealing surface; 14. Stuffing box sleeve; 15. Bracket; 16. Handwheel; 17. Nut; 18. Screw; 19. Docking ferrule device; 20. Bolt; 21. Stuffing; 22. Stuffing gland; 23. Pressure plate. DETAILED DESCRIPTION
[0020] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.
[0021] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.
[0022] Embodiment 1:
[0023] refer to Figure 1The present embodiment provides a high-efficiency heat exchange device for a valve, the valve comprising a valve body 1 and a valve stem 2, characterized in that the high-efficiency heat exchange device is arranged in the valve body 1, the high-efficiency heat exchange device comprises a corrugated cooling fin 3 and a heat spreader 4, the heat spreader 4 is sleeved on the valve stem 2, and forms a cavity 5 with the inner wall of the valve body 1, the cavity 5 is filled with a heat-conducting medium, the outer end of the corrugated cooling fin 3 is fixed to the inner wall of the valve body 1, and the inner end is fixed to the heat spreader 4.
[0024] In one embodiment, the corrugated cooling fins 3 are in a circular ring shape and can be installed in multiple layers, with gaps between the multiple layers for the heat-conducting medium to fill in.
[0025] In one embodiment, the heat spreader 4 is designed to be a hollow cylinder and is sleeved on the valve stem 2 .
[0026] In one embodiment, the corrugated cooling fins 3 are made of copper or aluminum sheets with good thermal conductivity.
[0027] The heat conducting medium here is thermal conductive glue.
[0028] This high-efficiency heat exchange device is not only suitable for various stop valves, but also for ball valves.
[0029] Embodiment 2:
[0030] refer to Figure 2 The present embodiment provides an LNG cryogenic valve, which includes a valve stem 2 and a lower valve body 6, an upper valve body 7 and a valve opening and closing structure that are fixedly connected in sequence. The valve stem 2 is inserted into the lower valve body 6 and the upper valve body 7, and the valve opening and closing structure controls the extension and contraction of the valve stem 2. A cavity 5 is provided in the middle of the upper valve body 7, and a high-efficiency heat exchange device is installed in the cavity 5. The high-efficiency heat exchange device includes a corrugated cooling fin 3 and a heat spreader 4. The heat spreader 4 is sleeved on the valve stem 2 and forms the cavity 5 with the inner wall of the valve body 1. The cavity 5 is filled with a heat-conducting medium. The outer end of the corrugated cooling fin 3 is fixed to the inner wall of the cavity 5, and the inner end is fixed to the heat spreader 4.
[0031] In one embodiment, the LNG cryogenic valve is a -162°C LNG stop valve, whose inlet 8 and outlet 9 are at a 90° angle. According to the characteristics of LNG cryogenic leakage, a multiple sealing method is adopted, and multiple sealing rings 10 and stuffing boxes 11 are arranged in the middle of the lower valve body 6 to resist LNG from directly penetrating upward and contacting the sealing surface 13 of the upper and lower valve bodies 6, so as to avoid freezing the sealing surface 13, thereby extending the service life of the sealing surface 13. And the main problem of LNG cryogenic valves is the diffusion of cold energy. Otherwise, the cold energy will diffuse to various parts of the valve along the valve stem 2, which will easily cause frost on the sealing parts, causing them to become brittle and hard, seriously affecting the sealing performance of the valve. In order to cope with this problem, the valve stem 2 of the traditional cryogenic valve is designed to be longer, but the cost of the mechanical manufacturing process becomes higher.
[0032] The main components of the high-efficiency heat exchange device are the combined application of corrugated cooling fins 3 and heat spreaders 4, wherein the heat spreader has high-efficiency heat diffusion capability, and the corrugated fins effectively increase the heat exchange area. At the same time, a heat-conducting medium (heat-conducting glue) is added to the contact surface between the outer end of the corrugated cooling fin 3 and the wall surface to prevent the cold from continuing to transfer upward and damaging the components and the sealing surface 13, thereby effectively shortening the length of the valve stem 2, making the LNG stop valve body 1 smaller, safer, and lower in processing and manufacturing costs.
[0033] In one embodiment, a sealing structure is installed between the valve stem 2 and the lower valve body 6 , and the sealing structure includes a plurality of sealing rings 10 , and a stuffing box 11 is arranged between two adjacent layers of sealing rings 10 .
[0034] The use of multiple sealing technologies can effectively prevent leakage caused by temperature differences, further effectively reduce the height of the valve stem 2, and reduce the overall size of the LNG cryogenic valve. The cryogenic valve is smaller in size, has lower processing and manufacturing costs, and is safer.
[0035] In one embodiment, the lower end of the valve stem 2 is a valve flap 12, and the conical sealing surface 13 of the valve flap 12 and the conical sealing surface 13 in the middle of the lower valve body 6 form the main sealing surface 13 of the valve. The upper valve body 7 and the lower valve body 6 are connected by flange bolts 20 to form the sealing surface 13.
[0036] In one embodiment, a stuffing box sleeve 14 is installed at the middle of the top of the lower valve body 6 to abut against the uppermost sealing ring 10 .
[0037] In one embodiment, the valve opening and closing structure includes: a bracket 15, a handwheel 16, a nut 17, a screw 18, a docking sleeve device 19, a bolt 20, a packing 21, a packing gland 22, and a pressure plate 23. One end of the bracket 15 is fixed to the upper valve body 7, and the end is provided with a through hole for the valve stem 2 to pass through. The nut 17 is fixed to the other end of the bracket 15, and the screw 18 is screwed on the nut 17. The handwheel 16 is fixed to the outer end of the screw 18, and the inner end of the screw 18 is connected to the valve stem 2 through the docking sleeve device 19. The valve stem 2 and the bracket 15 are filled with packing 21. One end of the packing gland 22 abuts against the packing 21, and the other end abuts against the pressure plate 23. The pressure plate 23 is sleeved on the valve stem 2 and fixed to the bracket 15 by bolts 20.
[0038] The docking sleeve device 19 includes a docking sleeve, a connecting nut, and a sealing gasket. The docking sleeve is fixed to the screw 18 and the valve stem 2 by using the connecting nut, and a sealing gasket is installed inside the docking sleeve to ensure the sealing of the connection part. According to specific working requirements, the hand wheel 16 is turned to drive the screw 18 to rotate, and at the same time, the rotation is transmitted to the valve stem 2 through the docking sleeve device 19 to drive the valve disc 12 to move up and down, completing the entire working process.
[0039] Under -162℃ working conditions, install the valve stem 2 according to specific requirements, adjust the prestress of the valve stem 2 so that the prestress is greater than the working pressure in the LNG pipeline. Then, install the main components. After installation, use flanges to connect the upper valve body 7 and the lower valve body 6. Finally, use flanges to connect the two ends of the lower valve body 6 to the LNG pipeline using bellows seals, and add insulation layers.
[0040] When the valve needs to be closed, the hand wheel 16 is rotated to move the valve stem 2 downward, driving the valve disc 12 to move downward and form a seal with the lower valve body 6. When LNG passes through the valve, due to LNG flash evaporation and other reasons, the valve mainly transfers cold energy upward through the lower valve body 6. The cold energy passes through the inner surface of the upper valve body 7, the cooling fins and the heat spreader 4 in the cavity 5 in the middle to disperse the cold energy, so as to ensure that the upper end of the valve is not frosted.
[0041] When the valve needs to be opened, the hand wheel 16 is rotated to move the valve stem 2 upward, driving the valve disc 12 upward and disengaging from the sealing surface 13 of the lower valve body 6. LNG flows to the right along the middle sealing surface 13 through the lower inlet 8 of the lower valve body 6. At this time, the right valve cavity is filled with LNG, and a small part of the LNG penetrates upward along the outer surface of the valve stem through the sealing structure and reaches the upper valve body 7.
[0042] At this time, the valve mainly transfers cold energy upward through the LNG in the upper valve body 7. The main part of the cold energy passes through the cooling fins and heat spreader 4 in the cavity 5 in the middle of the upper valve body 7, and the cold energy is dispersed into the atmosphere. A small amount of cold energy is transferred upward through the valve stem 2, and then transferred to the top of the valve after being sealed by the packing 21 in the upper part. At this time, the cold energy transferred to the top of the valve by the valve stem 2 is very small.
[0043] Those skilled in the art will readily appreciate other embodiments of the present application after considering the description and practicing the contents disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The description and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims.
[0044] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.
Claims
1. A high-efficiency heat exchange device for a valve, the valve comprising a valve body and a valve stem, characterized in that: The high-efficiency heat exchange device is arranged in the valve body, and the high-efficiency heat exchange device includes corrugated cooling fins and a heat spreader. The heat spreader is sleeved on the valve stem and forms a cavity with the inner wall of the valve body. The cavity is filled with a heat-conducting medium. The outer end of the corrugated cooling fin is fixed to the inner wall of the valve body, and the inner end is fixed to the heat spreader.
2. A high-efficiency heat exchange device for a valve according to claim 1, characterized in that: The valve is a stop valve or a ball valve.
3. The high-efficiency heat exchange device for a valve according to claim 1, characterized in that: The material of the corrugated cooling fins is copper sheet or aluminum sheet.
4. An LNG cryogenic valve, characterized in that: The LNG cryogenic valve includes a valve stem and a lower valve body, an upper valve body and a valve opening and closing structure that are fixedly connected in sequence. The valve stem is inserted into the lower valve body and the upper valve body, and the valve opening and closing structure controls the extension and contraction of the valve stem. A cavity is opened in the middle of the upper valve body, and a high-efficiency heat exchange device is installed in the cavity. The high-efficiency heat exchange device includes a corrugated cooling fin and a heat spreader. The heat spreader is sleeved on the valve stem and forms the cavity with the inner wall of the valve body. The cavity is filled with a heat-conducting medium. The outer end of the corrugated cooling fin is fixed to the inner wall of the cavity, and the inner end is fixed to the heat spreader.
5. The LNG cryogenic valve according to claim 4, characterized in that: A sealing structure is also installed between the valve stem and the lower valve body. The sealing structure includes several layers of sealing rings, and a stuffing box is arranged between two adjacent layers of sealing rings.
6. The LNG cryogenic valve according to claim 4, characterized in that: The lower end of the valve stem is a valve disc, and the conical sealing surface of the valve disc and the conical sealing surface in the middle of the lower valve body form the main sealing surface of the valve.
7. The LNG cryogenic valve according to claim 4, characterized in that: The upper valve body and the lower valve body are connected by flange bolts to form a sealing surface.
8. The LNG cryogenic valve according to claim 4, characterized in that: The material of the corrugated cooling fins is copper sheet or aluminum sheet.
9. The LNG cryogenic valve according to claim 4, characterized in that: A stuffing box compression sleeve is installed in the middle of the top of the lower valve body to resist the uppermost sealing ring.
10. The LNG cryogenic valve according to claim 4, characterized in that: The valve opening and closing structure includes: a bracket, a handwheel, a nut, a screw, a docking sleeve device, bolts, packing, a packing gland, and a pressure plate. One end of the bracket is fixed to the upper valve body, and the end is provided with a through hole for the valve stem to pass through. The nut is fixed to the other end of the bracket, and the screw is screwed on the nut. The handwheel is fixed to the outer end of the screw, and the inner end of the screw is connected to the valve stem through the docking sleeve device. The valve stem and the bracket paper are filled with packing. One end of the packing gland abuts against the packing, and the other end abuts against the pressure plate. The pressure plate is sleeved on the valve stem and fixed to the bracket by bolts.