A natural gas purification waste heat utilization device

Abstract

The utility model discloses a natural gas purification waste heat utilization device, including the shell, the both sides fixed sleeve of shell inner wall have the pipe plate, two the side of pipe plate near is fixed sleeve and is equipped with the pipe bundle, the surface fixed sleeve of pipe bundle has the baffle, the left side communication of shell bottom near the middle has the cold import, the left side communication of shell top far from the middle has the cold export, the left side communication of shell top near the middle has the hot import, the right side communication of shell bottom near the middle has the hot export, the right side communication of shell top near the middle has the pressure box, the top bolted connection of pressure box inner wall front end and rear end has the fixed block, the middle fixed connection of pressure box inner wall has the clamping slot, the bottom bolted connection of fixed block has spring no.

Description

Technical Field

[0001] This utility model belongs to the field of natural gas liquefaction technology, and specifically relates to a natural gas purification waste heat utilization device. Background Technology

[0002] The existing BOG reheating process in natural gas liquefaction suffers from low energy efficiency and insufficient cold energy recovery. Therefore, it is proposed to upgrade and optimize the existing BOG reheating system to construct an "integrated BOG reheating system utilizing waste heat from the natural gas purification system." The core idea is to use the high-temperature natural gas at the outlet of the natural gas purification unit as a heat source, replacing the original air bath heater (E-705A / B) with a new type of shell-and-tube heat exchanger. This achieves efficient BOG reheating and effective coupling of thermal energy between systems, ultimately achieving the goals of energy saving, consumption reduction, and stable operation.

[0003] However, traditional natural gas purification waste heat utilization devices are unable to respond in real time and release overpressure in a timely manner when the internal pressure of the shell rises abnormally. This can easily lead to continuous pressure accumulation, which not only increases the safety hazards caused by overpressure, but also affects the stability and reliability of the device operation due to insufficient pressure control. At the same time, the inability to collect condensate generated by the heat source natural gas in a timely manner can easily lead to the accumulation of liquid inside the shell, which can not only aggravate the corrosion of the shell and heat exchange components and shorten the service life of the device, but may also cause flow field turbulence and operational failures.

[0004] To address the problems mentioned above, a natural gas purification waste heat utilization device is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a natural gas purification waste heat utilization device, which has the advantages of adaptive pressure control and condensate collection.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a natural gas purification waste heat utilization device includes a shell, tube plates are fixedly sleeved on both sides of the inner wall of the shell, a tube bundle is fixedly sleeved through and on the adjacent side of the two tube plates, a baffle plate is fixedly sleeved on the surface of the tube bundle, a cold inlet is connected to the left side of the bottom of the shell near the middle, a cold outlet is connected to the left side of the top of the shell away from the middle, a hot inlet is connected to the left side of the top of the shell near the middle, a hot outlet is connected to the right side of the bottom of the shell near the middle, a pressure box is connected to the right side of the top of the shell near the middle, a fixing block is bolted to the top of the front and rear ends of the inner wall of the pressure box, a slot is fixedly connected to the middle of the inner wall of the pressure box, a spring is bolted to the bottom of the fixing block, a retaining ball is fixedly sleeved to the bottom of the spring, and the bottom of the retaining ball is engaged with the top of the inner wall of the slot, an exhaust pipe is connected to the top of the pressure box, a collection mechanism is provided at the bottom of the shell, and an adjustment mechanism is provided on the right side of the pressure box.

[0007] The above technical solution involves the following steps: The cold medium enters the tube bundle through the cold inlet, while the hot medium enters the middle of the shell through the hot inlet. Guided by baffles, the hot medium laterally washes over the tube bundle, achieving heat exchange between the cold and hot media through the tube walls. After heat exchange, the cold medium exits through the cold outlet, and the hot medium exits through the hot outlet. When the internal pressure of the device abnormally increases, the pressure pushes the retaining ball to overcome the elastic force of spring one and disengage from the retaining groove. The overpressure gas is discharged through the exhaust pipe one at the top of the pressure box, achieving adaptive pressure relief. Through top adaptive pressure relief, overpressure can be released in a timely manner when the internal pressure of the shell abnormally increases, enabling human intervention under special operating conditions. This effectively avoids safety risks caused by excessive pressure, improves the reliability and safety of system pressure control, and ensures stable operation of the device.

[0008] The present invention is further configured such that the collection mechanism includes a guide pipe, the guide pipe is located in the middle of the bottom of the outer shell, one end of the guide pipe is connected to a collection box, the top of the inside of the collection box is bolted to a spring two, the bottom of the spring two is fixedly connected to a float, the bottom of the collection box has an opening, and the top of the inner wall of the opening is engaged with the bottom of the float, and the bottom of the opening is connected to a drain pipe.

[0009] The above technical solution employs a collection mechanism. When the heat medium flows inside the shell, the condensate generated by its contact with the outer wall of the tube bundle collects along the bottom of the shell and flows into the collection box through a guide pipe. As the condensate gradually accumulates in the collection box, the rising liquid level causes the float to overcome the elastic force of spring two and move upwards, disengaging the float from the snap-fit ​​position at the bottom opening of the collection box. The condensate then flows through the opening into the drain pipe and is discharged. After the condensate is discharged, the liquid level drops, and the float resets under the elastic force of spring two, re-snagging the opening to prevent gas leakage. The collection box between each section of the guide plate prevents heat medium crossflow from affecting heat exchange efficiency, promptly collects condensate generated by the heat source natural gas, preventing its accumulation inside the shell and extending the device's service life. It also effectively prevents heat source leakage, orderly collects and discharges condensate, reduces the risk of operational failures caused by liquid accumulation, and ensures long-term continuous operation of the device, thereby guaranteeing the continuity and stability of the heat exchange process and improving the device's heat exchange efficiency.

[0010] The present invention is further configured such that the adjusting mechanism includes an adjusting box, the adjusting box is bolted to the right side of the pressure box, an electric telescopic rod is embedded in the top of the adjusting box, a sealing plug is bolted to the bottom of the electric telescopic rod, a through pipe connects the bottom of the right side of the pressure box to the bottom of the left side of the adjusting box, an exhaust pipe two is connected to the right side of the adjusting box, and the end of the exhaust pipe two away from the adjusting box is connected to the right side of the bottom of the exhaust pipe one.

[0011] The above technical solution is adopted: by setting an adjustment mechanism, when auxiliary pressure relief is required, the electric telescopic rod retracts and drives the sealing plug to move upward, opening the passage between the pressure box and the adjustment box. The overpressure gas in the device enters the adjustment box through the passage, and then flows into the exhaust pipe one through the exhaust pipe two to be discharged. After the pressure relief is completed, the electric telescopic rod extends and retracts and drives the sealing plug to reset, closing the passage to block gas leakage, thus realizing controllable pressure relief adjustment.

[0012] The present invention is further configured such that a damper is sleeved inside the first spring and a damper is sleeved inside the second spring.

[0013] By adopting the above technical solution, damper one and damper two can be set to limit spring one and spring two, preventing continuous rebound.

[0014] The present invention is further configured such that a telescopic sleeve is fitted onto the outside of the first spring and the second spring.

[0015] The above technical solution involves setting up a telescopic sleeve to seal spring one and spring two, preventing the gas inside the outer casing from affecting the working performance of spring one and spring two.

[0016] The present invention is further configured such that a pressure sensor is provided on the right side of the top of the outer casing away from the middle.

[0017] The above technical solution involves installing a pressure sensor, which allows for real-time monitoring of the internal air pressure and enables the electric telescopic rod to open the pipe and release pressure at any time.

[0018] The present invention is further configured such that the middle of the bottom of the inner shell is provided as a slope.

[0019] The above technical solution allows for easy drainage of condensate from the bottom of the casing by setting it as a ramp.

[0020] The present invention is further configured such that bases are bolted to the two sides of the bottom of the outer shell away from the middle.

[0021] The above technical solution uses a base to stabilize the device.

[0022] In summary, this utility model has the following beneficial effects: 1. This utility model, through top adaptive pressure relief, can release overpressure in a timely manner when the internal pressure of the shell rises abnormally, enabling human intervention under special working conditions, effectively avoiding safety risks caused by excessive pressure, improving the reliability and safety of system pressure control, and ensuring stable operation of the device; 2. This utility model can collect condensate generated by the heat source natural gas in a timely manner, preventing it from accumulating inside the shell and extending the service life of the device. At the same time, it can effectively prevent heat source leakage, collect and discharge condensate in an orderly manner, reduce the risk of operational failure caused by liquid accumulation, and ensure long-term continuous operation of the device, thereby ensuring the continuity and stability of the heat exchange process and improving the heat exchange efficiency of the device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a front sectional view of the overall structure of this utility model; Figure 3 This is a utility model Figure 2 Enlarged schematic diagram of the structure at point A; Figure 4 This is a utility model Figure 2 Enlarged schematic diagram of the structure at point B; Figure 5 This is a partial structural left-side sectional view of the present invention; Figure 6 This is a side view of the baffle structure of this utility model.

[0024] Reference numerals: 1. Outer shell; 2. Tube sheet; 3. Tube bundle; 4. Baffle plate; 5. Cold inlet; 6. Cold outlet; 7. Hot inlet; 8. Hot outlet; 9. Pressure box; 10. Fixing block; 11. Slot; 12. Spring 1; 13. Spring 2; 14. Ball retainer; 15. Exhaust pipe 1; 16. Exhaust pipe 2; 17. Guide pipe; 18. Collection box; 19. Float; 20. Opening; 21. Drain pipe; 22. Adjustment box; 23. Electric telescopic rod; 24. Sealing plug; 25. Through pipe; 26. Damper 1; 27. Damper 2; 28. Telescopic sleeve; 29. ​​Pressure sensor; 30. Base. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings. Example 1

[0026] refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6A natural gas purification waste heat utilization device includes an outer shell 1, which is made of corrosion-resistant low-temperature steel. Tube sheets 2, also made of corrosion-resistant low-temperature steel, are fixedly sleeved on both sides of the inner wall of the outer shell 1. A tube bundle 3, made of bimetallic composite tube, is passed through and fixedly sleeved on the adjacent side of the two tube sheets 2. A baffle plate 4, made of 09MnNiDR steel with a PTFE anti-frost coating, is fixedly sleeved on the surface of the tube bundle 3. A cold inlet 5 is connected to the left side of the bottom of the outer shell 1 near the middle, and a cold outlet 6 is connected to the left side of the top of the outer shell 1 away from the middle. A hot inlet 7 is connected to the left side of the top of the outer shell 1 near the middle, and a hot outlet 8 is connected to the right side of the bottom of the outer shell 1 near the middle. A pressure box 9 is connected to the right side of the top of the outer shell 1 near the middle. Fixing blocks 10 are bolted to the top of the front and rear ends of the inner wall of the pressure box 9. A slot 11 is fixedly connected to the middle of the inner wall of the pressure box 9. The bottom of the fixing block 10... A spring 12 is bolted to the pressure box 9. The spring force of the spring 12 is set to 0.8-1.2 N / mm. A retaining ball 14 is fixedly sleeved at the bottom of the spring 12, and the bottom of the retaining ball 14 is engaged with the top of the inner wall of the retaining groove 11. An exhaust pipe 15 is connected to the top of the pressure box 9. A collection mechanism is provided at the bottom of the outer shell 1. An adjustment mechanism is provided on the right side of the pressure box 9. The cold medium enters the tube bundle 3 from the cold inlet 5, and the hot medium enters the middle of the inner shell 1 from the hot inlet 7. After being guided by the baffle 4, the hot medium laterally washes the tube bundle 3. The heat exchange between the cold and hot medium is achieved through the tube wall of the tube bundle 3. After heat exchange, the cold medium is discharged from the cold outlet 6, and the hot medium is discharged from the hot outlet 8. When the internal pressure of the device rises abnormally, the pressure pushes the retaining ball 14 to overcome the spring force of the spring 12 and disengage from the retaining groove 11. The overpressure gas is discharged through the exhaust pipe 15 at the top of the pressure box 9, realizing adaptive pressure relief.

[0027] refer to Figure 1 , Figure 2 , Figure 3 The regulating mechanism includes an regulating box 22, which is bolted to the right side of the pressure box 9. An electric telescopic rod 23 is embedded in the top of the regulating box 22, and a sealing plug 24 is bolted to the bottom of the electric telescopic rod 23. The sealing plug 24 is covered with FKM fluororubber. A connecting pipe 25 connects the bottom right side of the pressure box 9 to the bottom left side of the regulating box 22. An exhaust pipe 26 is connected to the right side of the regulating box 22, and the end of the exhaust pipe 26 away from the regulating box 22 is connected to the right side of the bottom of the exhaust pipe 15. By setting up the regulating mechanism, when auxiliary pressure relief is required, the electric telescopic rod 23 extends and retracts, causing the sealing plug 24 to move upward, opening the channel 25 between the pressure box 9 and the regulating box 22. The overpressure gas in the device enters the regulating box 22 through the connecting pipe 25, and then flows into the exhaust pipe 15 through the exhaust pipe 26 to be discharged. After the pressure relief is completed, the electric telescopic rod 23 extends and retracts, causing the sealing plug 24 to reset, closing the connecting pipe 25 to block gas leakage, thus realizing controllable pressure relief regulation.

[0028] refer to Figure 1 , Figure 2 A pressure sensor 29 is installed on the right side of the top of the outer casing 1, away from the middle. By installing the pressure sensor 29, the internal air pressure of the outer casing 1 can be monitored in real time, and the electric telescopic rod 23 can be controlled to open the pipe 25 at any time to control the pressure relief.

[0029] refer to Figure 1 , Figure 2 The bottom of the outer casing 1 is bolted to the two sides away from the middle, and the device can be stabilized by setting the base 30. Example 2

[0030] refer to Figure 1 , Figure 2 , Figure 4 A natural gas purification waste heat utilization device includes a collection mechanism comprising a guide pipe 17, which is located at the middle of the bottom of the outer casing 1. One end of the guide pipe 17 is connected to a collection box 18. A spring 13 is bolted to the top of the inside of the collection box 18, and the spring force of the spring 13 is 0.05~0.075. N / mm, a float 19 is fixedly connected to the bottom of spring 13. An opening 20 is provided at the bottom of the collection box 18, and the top of the inner wall of the opening 20 is engaged with the bottom of the float 19. The bottom of the opening 20 is connected to a drain pipe 21. When the heat medium flows inside the shell 1, the condensate generated by contacting the outer wall of the tube bundle 3 collects along the bottom of the shell 1 and flows into the collection box 18 through the guide pipe 17. As the condensate gradually accumulates in the collection box 18, the liquid level rises and drives the float 19 to move upward against the elastic force of spring 13, so that the float 19 is disengaged from the engaged position of the opening 20 at the bottom of the collection box 18. The condensate flows into the drain pipe 21 through the opening 20 and is discharged. When the condensate is discharged, the liquid level drops, and the float 19 is reset under the elastic force of spring 13 and re-engages with the opening 20 to block gas leakage. The collection box 18 is set between each section of the guide plate to prevent the heat medium from flowing through and affecting the heat exchange efficiency.

[0031] refer to Figure 2 , Figure 3 , Figure 4 The spring 12 has a damper 26 inside, and the spring 23 has a damper 27 inside. By setting the damper 26 and the damper 27, the spring 12 and the spring 23 can be limited to prevent continuous rebound. The damping coefficient is 0.6-1.0 N·s / mm.

[0032] refer to Figure 2 , Figure 3 , Figure 4The outer sleeves of spring 12 and spring 23 are fitted with telescopic sleeves 28. By setting the telescopic sleeves 28, spring 12 and spring 23 can be sealed to prevent the gas inside the outer shell 1 from affecting the working performance of spring 12 and spring 23. The material is polytetrafluoroethylene reinforced nylon.

[0033] refer to Figure 2 The bottom of the inner shell 1 is set as a slope in the middle. By setting it as a slope, the condensate at the bottom of the shell 1 can be easily guided.

[0034] The pressure sensor model 29 is the MPM3801GRF from MicroSensing, with a range of 0-1.6MPa, an accuracy of ±0.25%FS, a temperature resistance of -40℃ to 125℃, a 316L stainless steel diaphragm, ExdIICT6 explosion-proof design, an all-stainless steel laser-welded structure, a compact size, and is suitable for gas medium measurement. It also supports linkage control with pressure relief systems.

[0035] Brief description of operation: The cold medium enters the tube bundle 3 through the cold inlet 5, and the hot medium enters the middle of the inner shell 1 through the hot inlet 7. After being guided by the baffle 4, the hot medium laterally washes over the tube bundle 3, achieving heat exchange between the cold and hot media through the tube wall. After heat exchange, the cold medium is discharged from the cold outlet 6, and the hot medium is discharged from the hot outlet 8. When the internal pressure of the device rises abnormally, the pressure pushes the retaining ball 14 to overcome the elastic force of the spring-12 and disengage from the retaining groove 11. The overpressure gas is discharged through the exhaust pipe-15 at the top of the pressure box 9, achieving adaptive pressure relief. When the hot medium flows inside the outer shell 1, it contacts the outer wall of the tube bundle 3. The generated condensate collects at the bottom of the outer shell 1 and flows into the collection box 18 through the guide pipe 17. As the condensate gradually accumulates in the collection box 18, the liquid level rises, causing the float 19 to move upward against the elastic force of the second spring 13. This causes the float 19 to disengage from the snap-fit ​​position of the bottom opening 20 of the collection box 18. The condensate flows into the drain pipe 21 through the opening 20 and is discharged. After the condensate is discharged, the liquid level drops, and the float 19 resets under the elastic force of the second spring 13, re-snap the opening 20 to block gas leakage. The collection box 18 is set between each section of the guide plate to prevent the heat medium from flowing across and affecting the heat exchange efficiency.

[0036] It should be noted that parts have a lifespan and can be replaced during regular maintenance when they no longer meet performance requirements. Deterioration in performance due to prolonged use of parts is not a design defect of this application.

[0037] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A natural gas purification waste heat utilization device, comprising a shell (1), characterized in that: Tube sheets (2) are fixedly sleeved on both sides of the inner wall of the outer shell (1). A tube bundle (3) is fixedly sleeved through and on the adjacent side of the two tube sheets (2). A baffle plate (4) is fixedly sleeved on the surface of the tube bundle (3). A cold inlet (5) is connected to the left side of the bottom of the outer shell (1) near the middle. A cold outlet (6) is connected to the left side of the top of the outer shell (1) away from the middle. A hot inlet (7) is connected to the left side of the top of the outer shell (1) near the middle. A hot outlet (8) is connected to the right side of the bottom of the outer shell (1) near the middle. A hot outlet (8) is connected to the right side of the top of the outer shell (1) near the middle. The pressure box (9) has a fixing block (10) bolted to the top of the front and rear ends of the inner wall of the pressure box (9). A slot (11) is fixedly connected to the middle of the inner wall of the pressure box (9). A spring (12) is bolted to the bottom of the fixing block (10). A ball (14) is fixedly sleeved at the bottom of the spring (12), and the bottom of the ball (14) is engaged with the top of the inner wall of the slot (11). An exhaust pipe (15) is connected to the top of the pressure box (9). A collection mechanism is provided at the bottom of the outer shell (1). An adjustment mechanism is provided on the right side of the pressure box (9).

2. The natural gas purification waste heat utilization device according to claim 1, characterized in that: The collection mechanism includes a guide tube (17), which is located in the middle of the bottom of the outer shell (1). One end of the guide tube (17) is connected to a collection box (18). The top of the inside of the collection box (18) is bolted with a spring (13). The bottom of the spring (13) is fixedly connected with a float (19). The bottom of the collection box (18) has an opening (20), and the top of the inner wall of the opening (20) is engaged with the bottom of the float (19). The bottom of the opening (20) is connected to a drain pipe (21).

3. The natural gas purification waste heat utilization device according to claim 1, characterized in that: The adjustment mechanism includes an adjustment box (22), which is bolted to the right side of the pressure box (9). An electric telescopic rod (23) is embedded in the top of the adjustment box (22), and a sealing plug (24) is bolted to the bottom of the electric telescopic rod (23). A through pipe (25) is connected between the bottom right side of the pressure box (9) and the bottom left side of the adjustment box (22). An exhaust pipe (16) is connected to the right side of the adjustment box (22), and the end of the exhaust pipe (16) away from the adjustment box (22) is connected to the right side of the bottom of the exhaust pipe (15).

4. The natural gas purification waste heat utilization device according to claim 2, characterized in that: The first spring (12) has a damper (26) inside it, and the second spring (13) has a damper (27) inside it.

5. A natural gas purification waste heat utilization device according to claim 2, characterized in that: The spring one (12) and spring two (13) are fitted with telescopic sleeves (28).

6. The natural gas purification waste heat utilization device according to claim 1, characterized in that: A pressure sensor (29) is provided on the right side of the top of the housing (1), away from the middle.

7. The natural gas purification waste heat utilization device according to claim 1, characterized in that: The bottom of the inner part of the outer shell (1) is set as a slope.

8. The natural gas purification waste heat utilization device according to claim 1, characterized in that: The bottom of the outer casing (1) is bolted to the two sides away from the middle, with bases (30) attached.

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