A nitrogen pressurized expansion tank control system

Abstract

The utility model provides a kind of nitrogen pressurized expansion tank control system, including pressure expansion tank module and heat exchange circulation module;Heat exchange circulation module includes primary side and secondary side, and the side end upper end of hot oil exchanger is connected customer hot oil inlet and customer hot oil outlet by pneumatic tee regulating valve, and the side end lower end of hot oil exchanger is connected customer hot oil outlet by stop valve;The lower end of hot oil exchanger is connected with heat conduction oil inlet pipeline by magnetic pump, and heat conduction oil inlet and heat conduction oil outlet are communicated to form heat conduction oil circulation loop;Pressure expansion tank module includes expansion tank, and nitrogen outlet, safety valve discharge port and nitrogen inlet are equipped above expansion tank;Expansion tank's bottom is equipped with oil supplementing port, and expansion tank's oil inlet and user end's heat conduction oil barrel pipeline are communicated.By modular design and intelligent control, the stability and reliability of heat conduction oil circulation system are significantly improved, and the stringent requirements of chemical industry and pharmaceutical industry on wide temperature range control can be met.

Description

Technical Field

[0001] This utility model belongs to the field of industrial fluid control system technology, specifically, it relates to a nitrogen pressurized expansion tank control system. Background Technology

[0002] In the production processes of industries such as chemicals and pharmaceuticals, precise control of reaction temperature is a key factor in ensuring product quality. Currently, commonly used heat transfer media in industrial production include ethylene glycol aqueous solutions and high- and low-temperature silicone oils, but their physical properties have inherent defects: they are prone to solidification at low temperatures and vaporization at high temperatures. To solve this problem, the industry typically uses external pressurization to maintain the liquid flow state of the heat transfer media, with nitrogen-pressurized sealed expansion tanks being one of the mainstream solutions. Existing expansion tank control systems have the following shortcomings: they employ mechanical single-point control, which cannot dynamically adjust the pressure according to system operating conditions, leading to an increased risk of media vaporization at high temperatures and the absorption of moisture from the air at low temperatures, diluting the heat transfer media or causing water to be carried into the silicone oil, affecting heat transfer efficiency; the pressure control module and heat exchange circulation module are independently set up, resulting in complex pipeline connections, a high risk of leakage, and a lack of effective venting, sewage discharge, and liquid level monitoring mechanisms, resulting in poor system integration; system oil replenishment and venting operations rely on manual intervention, resulting in slow response speeds and an inability to monitor the system's operating status in real time.

[0003] Therefore, developing an integrated and intelligent nitrogen pressurization expansion tank control system to solve the problems of low pressure control accuracy, poor system integration and inconvenient maintenance in the existing technology has become an urgent technical need in this field. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, the purpose of this utility model is to provide a nitrogen pressurized expansion tank control system. Through modular design and dynamic pressure regulation, it achieves stable operation of the heat transfer medium within a wide temperature range, while improving the system's integration and ease of maintenance, thereby solving the problems of low pressure control accuracy, poor system integration, and inconvenient maintenance in the existing technology.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows: a nitrogen pressurized expansion tank control system, including a pressure expansion tank module and a heat exchange circulation module; the heat exchange circulation module includes a primary side and a secondary side, the primary side includes a customer hot oil inlet and a customer hot oil outlet, the secondary side includes a heat oil exchanger, a heat transfer oil outlet, a heat transfer oil inlet, and a magnetic pump; wherein, the upper end of one side of the heat oil exchanger is connected to the customer hot oil inlet and the customer hot oil outlet through a pneumatic three-way regulating valve, and the lower end of one side of the heat oil exchanger is connected to the customer hot oil outlet through a shut-off valve; the oil outlet of the heat oil exchanger is connected to the heat transfer oil outlet through a pipeline, and the lower end of the heat oil exchanger is connected to the heat transfer oil inlet pipeline through a magnetic pump, and the heat transfer oil inlet and the heat transfer oil outlet are connected to form a heat transfer oil circulation loop; The pressure expansion tank module includes an expansion tank. The expansion tank is provided with a nitrogen outlet for releasing excess nitrogen, a safety valve outlet for relieving pressure, and a nitrogen inlet for replenishing nitrogen source at the top. The bottom of the expansion tank is provided with an oil replenishment port, which is connected to the pipeline where the oil outlet of the heat oil exchanger is located. The oil filling port of the expansion tank is connected to the heat transfer oil tank pipeline at the user end.

[0006] Furthermore, on the nitrogen inlet pipeline of the expansion tank, a check valve, a self-regulating pressure regulating valve, and a shut-off valve are sequentially connected in series along the nitrogen inlet direction; the nitrogen outlet is connected to the nitrogen / safety valve vent through the self-regulating pressure regulating valve and the shut-off valve, and the safety valve vent is connected to the nitrogen / safety valve vent through the shut-off valve.

[0007] Furthermore, one side of the expansion tank is connected to a magnetic level gauge interface via a ball valve, and the magnetic level gauge interface is connected to the magnetic level gauge via a flange.

[0008] Furthermore, the upper oil outlet of the heat exchanger is connected to the heat transfer oil outlet pipe through a shut-off valve, and the oil outlet of the heat exchanger is also connected to an external test port through a pipeline, forming a dual-path diversion structure.

[0009] Furthermore, on the pipeline connecting the heat transfer oil inlet and the magnetic pump, a shut-off valve, a temperature transmitter, and a gas collection cylinder are sequentially connected in series along the flow direction of the heat transfer oil.

[0010] Furthermore, the expansion tank is provided with an exhaust port and a drain port on the other side. The exhaust port is connected to the gas collecting cylinder. A pressure transmitter interface is also provided on the top of the expansion tank. This interface is connected to the pressure transmitter signal. A thermometer is provided at the bottom of the expansion tank. This thermometer is connected to the temperature transmitter signal.

[0011] Furthermore, the signal output terminals of the magnetic level gauge, pressure transmitter, and temperature transmitter are electrically connected to the remote monitoring system, and the range of the magnetic level gauge is matched with the height of the expansion tank.

[0012] Furthermore, the control terminal of the pneumatic three-way regulating valve is electrically connected to the temperature transmitter, and the temperature transmitter has a measurement range of -50℃ to 300℃.

[0013] Furthermore, a filter is provided at the customer's hot oil inlet.

[0014] Furthermore, a hand-cranked pump is installed between the filling port of the expansion tank and the external heat transfer oil tank pipeline, and the outlet of the hand-cranked pump is connected to the filling port pipeline through a one-way valve.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Through the design of nitrogen outlet, nitrogen inlet and safety valve discharge port, a self-regulating pressure regulating valve is adopted to achieve dynamic pressure regulation, automatically maintain the stable nitrogen pressure in the expansion tank and avoid the risk of overpressure; 2. The pressure regulation module and heat exchange circulation module are integrated into one design, with a compact pipeline layout and fewer leakage points; it integrates exhaust, sewage discharge and liquid level monitoring functions, simplifies the system structure and has a high degree of system integration.

[0016] 3. The hand pump is linked with the oil replenishment port to achieve rapid oil replenishment to adapt to emergency scenarios; the magnetic level gauge, pressure and temperature signals are integrated into the remote monitoring system to reduce labor costs.

[0017] In summary, this utility model significantly improves the stability and reliability of the heat transfer oil circulation system through modular design and intelligent control, and can meet the stringent requirements of the chemical and pharmaceutical industries for wide temperature range control. Attached Figure Description

[0018] Figure 1 This is a system structure block diagram of the all-in-one machine of this utility model; In the diagram: 1. Customer hot oil inlet; 2. Customer hot oil outlet; 3. Heat oil exchanger; 4. Heat transfer oil inlet; 5. Heat transfer oil outlet; 6. Magnetic pump; 7. Pneumatic three-way regulating valve; 8. Shut-off valve; 9. Expansion tank; 10. Nitrogen outlet; 11. Safety valve discharge port; 12. Nitrogen inlet; 13. Oil replenishment port; 14. Oil filling port; 15. Heat transfer oil tank; 16. Check valve; 17. Self-regulating pressure regulating valve; 18. Nitrogen / safety valve vent; 19. Magnetic level gauge; 20. Gas collection cylinder; 21. Temperature transmitter; 22. Exhaust port; 23. Sewage outlet; 24. Pressure transmitter; 25. Thermometer; 26. Filter; 27. Hand pump. Detailed Implementation

[0019] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0020] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0021] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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.

[0022] The present invention will be further described below with reference to specific embodiments.

[0023] This utility model provides a nitrogen-pressurized expansion tank control system, including a pressure expansion tank module and a heat exchange circulation module. The heat exchange circulation module includes a primary side and a secondary side. The primary side includes a customer hot oil inlet 1 and a customer hot oil outlet 2. The secondary side includes a heat oil exchanger 3, a heat transfer oil outlet 5, a heat transfer oil inlet 4, and a magnetic pump 6. The upper end of one side of the heat oil exchanger 3 is connected to the customer hot oil inlet 1 and the customer hot oil outlet 2 via a pneumatic three-way regulating valve 7, and the lower end of one side of the heat oil exchanger 3 is connected to the customer hot oil outlet 2 via a shut-off valve 8. The oil outlet of the heat oil exchanger 3 is connected to... The heat transfer oil outlet 5 is connected, and the lower end of the heat exchanger 3 is connected to the heat transfer oil inlet 4 via a magnetic pump 6. The heat transfer oil inlet 4 and the heat transfer oil outlet 5 are connected to form a heat transfer oil circulation loop. The pressure expansion tank module includes an expansion tank 9. The expansion tank 9 is provided with a nitrogen outlet 10 for releasing excess nitrogen, a safety valve discharge port 11 for releasing pressure, and a nitrogen inlet 12 for replenishing nitrogen source. The bottom of the expansion tank 9 is provided with an oil replenishment port 13. The oil replenishment port 13 is connected to the pipeline where the oil outlet of the heat exchanger 3 is located. The oil filling port 14 of the expansion tank 9 is connected to the heat transfer oil tank 15 at the user end via a pipeline.

[0024] During operation, when the heat transfer oil in the secondary side circulation pipeline is insufficient, the medium is automatically replenished to the system through the oil replenishment port 13 to maintain a stable circulation flow. The key function of the pneumatic three-way regulating valve 7 is to dynamically allocate the flow direction and flow rate of the customer's hot oil according to the actual needs of the secondary side heat transfer oil: when the secondary side needs heating, the valve guides the customer's hot oil (high-temperature heat source) into the heat oil exchanger 3 to exchange heat with the secondary side heat transfer oil, ensuring that the temperature of the heat transfer oil reaches the set value; if the temperature of the customer's hot oil itself already meets the requirements (no additional heat exchange is required), or if the temperature of the secondary side heat transfer oil exceeds the target threshold, the valve will automatically switch the flow direction, so that the customer's hot oil does not pass through the heat oil exchanger 3 and flows directly out from the customer's hot oil outlet 2 through the bypass path, avoiding energy waste or overheating risks caused by ineffective heat exchange.

[0025] Preferably, a check valve 16, a self-regulating pressure regulating valve 17, and a shut-off valve 8 are sequentially connected in series along the nitrogen inlet 12 pipeline of the expansion tank 9; the nitrogen outlet 10 is connected to the nitrogen / safety valve vent 18 through the self-regulating pressure regulating valve 17 and the shut-off valve 8, and the safety valve discharge port 11 is connected to the nitrogen / safety valve vent 18 through the shut-off valve 8.

[0026] Preferably, one side of the expansion tank 9 is connected to a magnetic level gauge interface via a ball valve, and the magnetic level gauge interface is connected to the magnetic level gauge 19 via a flange. The expansion tank 9 serves as a buffer storage unit for the heat transfer oil. The magnetic level gauge 19 connected to the magnetic level gauge interface monitors the liquid level in real time and transmits the signal to a remote monitoring system, enabling visualized management of the liquid level.

[0027] Preferably, the upper oil outlet of the heat exchanger 3 is connected to the heat transfer oil outlet 5 via a shut-off valve 8, and the oil outlet of the heat exchanger 3 is also connected to an external test port via a pipeline, forming a dual-flow structure. The heat transfer oil, after absorbing heat, flows out from the oil outlet of the heat exchanger 3; part of it enters the secondary side main circulation pipeline through the heat transfer oil outlet 5, and the other part is used for user-side testing via the external test port. Preferably, on the pipeline connecting the heat transfer oil inlet 4 and the magnetic pump 6, a shut-off valve 8, a temperature transmitter 21, and a gas collecting cylinder 20 are sequentially connected in series along the flow direction of the heat transfer oil.

[0028] Preferably, the other end of the expansion tank 9 is provided with an exhaust port 22 and a drain port 23. The exhaust port 22 is connected to the gas collecting cylinder 20. A system manual exhaust valve is also provided on the pipeline where the exhaust port 22 and the gas collecting cylinder 20 are located. A pressure transmitter interface is also provided on the top of the expansion tank 9. This interface is connected to the pressure transmitter 24 for signal transmission. A thermometer 25 is provided at the bottom of the expansion tank 9. The thermometer 25 is connected to the temperature transmitter 21 for signal transmission. Both the pressure transmitter 24 and the temperature transmitter are electrically connected to the remote monitoring system to realize the measurement, indication and process regulation of system pressure and temperature.

[0029] Preferably, the signal output terminals of the magnetic level gauge 19, pressure transmitter 24, and temperature transmitter 21 are electrically connected to the remote monitoring system, and the range of the magnetic level gauge 19 is matched with the height of the expansion tank 9; the pressure, temperature, and level signals are integrated into the remote monitoring system to reduce manual maintenance costs.

[0030] Preferably, the control terminal of the pneumatic three-way regulating valve 7 is electrically connected to the temperature transmitter 21, and the temperature transmitter 21 has a measurement range of -50℃ to 300℃. When the temperature transmitter 21 detects that the temperature of the customer's hot oil outlet 2 is lower than the set value, the valve increases the flow rate into the hot oil exchanger 3 to improve the heat exchange efficiency. When the temperature of the customer's hot oil outlet 2 is detected to exceed the set value, the valve decreases the flow rate into the exchanger and increases the bypass flow rate. Through this dynamic adjustment mode, the real-time distribution and control of the customer's hot oil flow rate is achieved, ensuring that the secondary side heat oil temperature remains stable within the target range.

[0031] Preferably, a filter 26 is provided at the customer hot oil inlet 1 to prevent impurities from clogging the valve.

[0032] Preferably, a hand-cranked pump 27 is provided between the filling port 14 of the expansion tank 9 and the external heat transfer oil tank 15. The outlet of the hand-cranked pump 27 is connected to the filling port 14 via a one-way valve. If the liquid level in the expansion tank 9 is too low, heat transfer oil is replenished into the tank through the filling port 14 via the hand-cranked pump 27 connected to the user-end heat transfer oil tank 15. The one-way valve at the outlet of the hand-cranked pump 27 prevents backflow of the medium.

[0033] The working principle of this utility model is as follows: The nitrogen-pressurized expansion tank control system mainly works in conjunction with the heat exchange cycle and pressure regulation module to achieve stable circulation of heat transfer oil and control of system pressure.

[0034] In the heat exchange circulation module, customer hot oil enters the system through customer hot oil inlet 1, first passing through filter 26 to filter impurities, and then flows into pneumatic three-way regulating valve 7. This valve dynamically adjusts the flow rate according to the temperature signal at customer hot oil outlet 2, allowing the hot oil to enter the heat exchanger 3 for heat exchange. After heat exchange, the customer hot oil flows back from the oil outlet at the lower end of the heat exchanger 3 to customer hot oil outlet 2, returning to the customer hot oil inlet 1 at the user end, completing the primary side circulation. For the heat transfer oil that has absorbed heat on the secondary side, it flows out from the oil outlet of the heat exchanger 3. Part of it enters the secondary side main circulation pipeline through heat transfer oil outlet 5, and the other part is used for user end testing through the external test port. The heat transfer oil in the secondary side main circulation pipeline is driven by magnetic pump 6, and flows sequentially through shut-off valve 8, temperature transmitter 21 (real-time monitoring of oil temperature) and gas collector 20 (separating dissolved gases in the heat transfer oil to avoid gas blockage), and finally circulates back to heat transfer oil inlet 4, forming a secondary side closed loop circulation.

[0035] When the pressure inside the expansion tank 9 is lower than the set value, the self-regulating pressure regulating valve 17 automatically opens, and an external nitrogen source enters the expansion tank 9 through the pipeline to maintain stable pressure inside the tank. When the system temperature rises and causes the pressure inside the heat transfer oil expansion tank to exceed the threshold, the self-regulating pressure regulating valve 17 connected to the nitrogen outlet 10 opens, and excess nitrogen is discharged through the nitrogen / safety valve vent 18. If the pressure rises abnormally to the safety limit, the safety valve vent 11 acts as a safety valve to quickly release pressure and prevent equipment damage due to overpressure. The oil replenishment port 13 at the bottom of the expansion tank 9 is connected to the oil outlet of the heat exchanger 3. This serves two purposes: firstly, it facilitates the automatic replenishment of medium to the system when the heat transfer oil in the secondary circulation pipeline is insufficient, maintaining stable circulation flow; secondly, when the temperature of the heat transfer oil increases after heat exchange and expands, the high-temperature heat transfer oil flows back into the expansion tank 9 to stabilize the system pressure. The oil filling port 14 is connected to the external heat transfer oil tank 15 through the hand pump 27, supporting manual oil replenishment.

[0036] The system also integrates multiple monitoring and control components: a magnetic level gauge 19 monitors the oil level in the expansion tank 9 in real time; a pressure transmitter 24 and a temperature transmitter 21 collect the tank pressure and heat transfer oil temperature, respectively; and all signals are transmitted to a remote monitoring system for visualized management. A pneumatic three-way regulating valve 7 is linked to the temperature transmitter 21 to automatically adjust the primary side hot oil flow rate based on the secondary side oil temperature, ensuring stable heat exchange efficiency. Furthermore, the filter 26 at the customer's hot oil inlet 1, the exhaust function of the air collector 20, and the design of the drain port 23 further ensure the safety and reliability of the system operation.

[0037] In summary, this utility model significantly improves the stability and reliability of the heat transfer oil circulation system through modular design and intelligent control, and can meet the stringent requirements of the chemical and pharmaceutical industries for wide temperature range control.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A nitrogen-pressurized expansion tank control system, characterized in that, It includes a pressure expansion tank module and a heat exchange circulation module; the heat exchange circulation module includes a primary side and a secondary side, the primary side includes a customer hot oil inlet (1) and a customer hot oil outlet (2), and the secondary side includes a heat oil exchanger (3), a heat transfer oil outlet (5), a heat transfer oil inlet (4), and a magnetic pump (6); wherein, The upper end of one side of the heat exchanger (3) is connected to the customer's hot oil inlet (1) and the customer's hot oil outlet (2) through a pneumatic three-way regulating valve (7), and the lower end of one side of the heat exchanger (3) is connected to the customer's hot oil outlet (2) through a shut-off valve (8); the oil outlet of the heat exchanger (3) is connected to the heat transfer oil outlet (5) through a pipeline, and the lower end of the heat exchanger (3) is connected to the heat transfer oil inlet (4) through a magnetic pump (6), and the heat transfer oil inlet (4) and the heat transfer oil outlet (5) are connected to form a heat transfer oil circulation loop; The pressure expansion tank module includes an expansion tank (9), which has a nitrogen outlet (10) for releasing excess nitrogen, a pressure relief valve outlet (11) and a nitrogen inlet (12) for replenishing nitrogen source. The expansion tank (9) has an oil replenishment port (13) at the bottom, which is connected to the pipeline where the oil outlet of the heat exchanger (3) is located. The oil filling port (14) of the expansion tank (9) is connected to the pipeline of the heat transfer oil tank (15) at the user end.

2. The nitrogen pressurized expansion tank control system according to claim 1, characterized in that, On the nitrogen inlet (12) pipeline of the expansion tank (9), a check valve (16), a self-regulating pressure regulating valve (17) and a shut-off valve (8) are connected in series along the nitrogen inlet direction; the nitrogen outlet (10) is connected to the nitrogen / safety valve vent (18) through the self-regulating pressure regulating valve (17) and the shut-off valve (8), and the safety valve discharge port (11) is connected to the nitrogen / safety valve vent (18) through the shut-off valve (8).

3. The nitrogen pressurized expansion tank control system according to claim 1, characterized in that, One side of the expansion tank (9) is connected to a magnetic level gauge interface via a ball valve, and the magnetic level gauge interface is connected to the magnetic level gauge (19) via a flange.

4. The nitrogen pressurized expansion tank control system according to claim 1, characterized in that, The upper oil outlet of the heat exchanger (3) is connected to the heat transfer oil outlet (5) via a shut-off valve (8), and the oil outlet of the heat exchanger (3) is also connected to an external test port via a pipeline, forming a dual-path diversion structure.

5. The nitrogen pressurized expansion tank control system according to claim 4, characterized in that, On the pipeline connecting the heat transfer oil inlet (4) and the magnetic pump (6), a shut-off valve (8), a temperature transmitter (21) and a gas collector (20) are connected in series along the flow direction of the heat transfer oil.

6. The nitrogen pressurized expansion tank control system according to claim 5, characterized in that, The expansion tank (9) is provided with an exhaust port (22) and a drain port (23) on the other side. The exhaust port (22) is connected to the gas collection cylinder (20). A pressure transmitter interface is also provided on the top of the expansion tank (9). The interface is connected to the pressure transmitter (24) via signal. A thermometer (25) is provided at the bottom of the expansion tank (9). The thermometer (25) is connected to the temperature transmitter (21) via signal.

7. The nitrogen pressurized expansion tank control system according to claim 6, characterized in that, The signal output terminals of the magnetic level gauge (19), pressure transmitter (24) and temperature transmitter (21) are electrically connected to the remote monitoring system. The range of the magnetic level gauge (19) is matched with the height of the expansion tank (9).

8. The nitrogen pressurized expansion tank control system according to claim 7, characterized in that, The control terminal of the pneumatic three-way regulating valve (7) is electrically connected to the temperature transmitter (21), and the temperature transmitter (21) has a measurement range of -50℃ to 300℃.

9. The nitrogen pressurized expansion tank control system according to claim 1, characterized in that, A filter (26) is provided at the customer hot oil inlet (1).

10. The nitrogen pressurized expansion tank control system according to claim 1, characterized in that, A hand pump (27) is provided between the oil filling port (14) of the expansion tank (9) and the external heat transfer oil tank (15) pipeline. The outlet of the hand pump (27) is connected to the oil filling port (14) pipeline through a one-way valve.

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