Propylene composite feeding system
By combining a booster and a feed pump set, supplemented by countercurrent heat exchange and reflux pipelines, the structural complexity, high energy consumption, and safety issues of the propylene feed system have been resolved, achieving stable and safe propylene feed.
Patent Information
- Application Number
- CN202520779298.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-04-23
AI Technical Summary
Existing propylene feeding systems have problems in terms of structural complexity, energy consumption, operational stability and safety. Traditional pumping methods are greatly affected by electrical systems and are prone to vaporization in summer. Pressure conveying consumes a lot of steam and has high equipment requirements. Existing equipment has a complex structure and high operating costs.
By combining a booster and a feed pump set, along with different feed pipelines and valves, countercurrent heat exchange between steam and propylene is achieved. By combining pumping and pressure delivery methods, the steam consumption is regulated by a temperature control device, and a return pipeline is set up to ensure system stability.
It reduces steam consumption, improves the stability of propylene feed pump unit operation, reduces equipment maintenance costs, enhances safety, and avoids feed fluctuations and equipment damage caused by propylene vaporization.
Smart Images
Figure CN223924547U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of propylene conveying technology, specifically relating to a propylene composite feeding system. Background Technology
[0002] Propylene is gaseous at room temperature and pressure, but is usually stored in liquid form. Depending on the storage conditions, it is classified into pressurized storage and cryogenic storage. Traditional propylene tank farm feeding systems mainly use pump delivery and pressure delivery. Propylene feeding pump sets are energy-saving, have low operating costs, and can supply material immediately upon pump start-up. However, pumping is significantly affected by the electrical system, and in high summer temperatures, propylene is prone to vaporization in the pipeline, causing pressure differences and potentially leading to propylene backflow. This not only affects the stability of the supply but may also damage the pumps and other equipment, increasing equipment maintenance costs and safety risks. Pressure delivery mainly relies on propylene boosters. Propylene booster feeding has the advantages of simple operation and stable supply, but it consumes a large amount of steam, resulting in high supply costs. Furthermore, the high pressure in the propylene tanks during supply places higher demands on the tanks' pressure resistance and safety protection measures. Insufficient tank pressure resistance or failure of safety protection devices can lead to serious safety accidents.
[0003] CN217653692U discloses a feeding device for propylene in a tank farm, including an inlet main pipe, two feeding pumps, an inlet branch pipe connected to the pump inlet, an outlet branch pipe connected to the outlet main pipe, an outlet branch pipe with a return pipe connected to the inlet main pipe and equipped with a return valve, a circulation branch pipe, a vent pipe, a drain pipe, and a control device. This device ensures safe pump operation at low flow rates through the vent and circulation branch pipes, improves safety and product quality through the vent and drain design, and achieves automated adjustment through the control device. However, this feeding device has a complex structure and requires pressure detection and flow control throughout the process to achieve stable operation, resulting in high operating costs and a complex operation process. Moreover, the complex structure means more potential failure points, increasing the probability of device failure and reducing the overall reliability of the device.
[0004] In summary, existing propylene feeding systems suffer from varying degrees of problems in terms of structural complexity, energy consumption, operational stability, and safety. Therefore, designing a propylene feeding device that is simple in structure, low in energy consumption, stable in operation, and safe and reliable is of great significance. This will not only help reduce production costs but also improve the safety and reliability of the production process, meeting the growing demand for propylene feeding systems in industrial production. Utility Model Content
[0005] The purpose of this utility model is to overcome the defects of the existing technology and provide a propylene compound feeding system. By combining the booster and the feed pump set, and assisting different feed pipelines and valves, it saves steam consumption, improves the stability of the propylene feed pump set operation under different seasonal temperatures, and has a simple overall structure, saving the construction and maintenance costs of the propylene buffer tank of the production unit.
[0006] The propylene compound feeding system of this utility model includes a propylene spherical tank, a propylene booster, and a propylene feed pump set. The bottom of the propylene spherical tank is connected to the bottom of the propylene booster, and the top of the propylene booster is connected to a return pipeline to the propylene spherical tank. The propylene booster consists of a tube side and a shell side. The tube side is used to transport propylene, and its top and bottom are connected to the propylene spherical tank via pipelines. The shell side is used for steam transport. Propylene and steam flow counter-currently to achieve heat exchange between the steam and propylene. The bottom of the propylene spherical tank is connected to the propylene feed pump set. The propylene feed pump set consists of feed pump A and feed pump B connected in parallel. The outlet pipes of feed pump A and feed pump B are connected to the propylene conveying pipeline, which is used to transport liquid propylene to downstream units. A branch line is set at the bottom of the propylene spherical tank directly connected to the propylene conveying pipeline, which is used to directly transport the propylene in the propylene spherical tank to the downstream units. The propylene conveying pipeline is equipped with a branch line for return to the propylene spherical tank, and a control valve is set on the branch line to realize the return of liquid propylene, thereby quickly regulating the propylene pressure during system operation.
[0007] Preferably, the propylene spherical tank is equipped with a radar level gauge, a pressure gauge, and a temperature control device.
[0008] Preferably, the upper shell-side inlet of the propylene booster is connected to a steam delivery pipeline, and the lower shell-side outlet of the propylene booster is connected to a steam output pipeline. A steam control valve is installed on the steam delivery pipeline. The steam control valve and the temperature control device on the propylene spherical tank form a control loop, which is used to adjust the amount of steam used during system operation in real time according to the temperature of the propylene spherical tank.
[0009] Preferably, the bottom of the propylene spherical tank is connected to the propylene water separator, the top of the propylene water separator is provided with a pipeline connected to the propylene spherical tank, and the bottom of the propylene water separator is connected to the sewage pipeline.
[0010] Preferably, a stop valve for feed pump A is installed on the outlet pipe of feed pump A, and a pressure gauge for feed pump A is installed after the stop valve for feed pump A; a stop valve for feed pump B is installed on the outlet pipe of feed pump B, and a pressure gauge for feed pump B is installed after the stop valve for feed pump B. Furthermore, the stop valves for feed pump A and feed pump B are used to prevent propylene backflow into the pumps during the single-pump operation of feed pump A and feed pump B.
[0011] Preferably, a regulating valve is provided on the propylene conveying pipeline, and further, the regulating valve is located on the main confluence of the outlet pipelines of feed pumps A and B.
[0012] Specifically, the workflow of the propylene compound feeding system is as follows: During system operation, affected by external temperature, the state of propylene inside the propylene tank can be determined by the radar level gauge, pressure gauge, and temperature control device on the propylene tank. When the external temperature is low and the saturated vapor pressure of propylene is low, a feed pump is used to transport liquid propylene. Feed pump A and feed pump B operate in pairs, one on and one on standby. When the pressure in the downstream unit is slightly higher than the outlet pressure of the feed pump, the pipeline connecting the propylene booster and the propylene tank is connected, and the steam control valve on the steam conveying pipeline is opened to heat the propylene. The heated propylene is returned to the propylene tank to pressurize it. The steam consumption is controlled by the temperature control device on the propylene tank. When the temperature exceeds the set process temperature, the steam consumption is reduced to prevent abnormal system pressure and ensure propylene delivery. During feed pump delivery, the outlet pressure of the feed pump must be maintained at 1.0-1.2 MPa. When overpressure occurs, the opening of the control valve is adjusted to return part of the propylene to the propylene tank, achieving rapid pressure reduction and ensuring system stability.
[0013] Due to high summer temperatures, the propylene tank experiences high temperatures and pressures. To ensure the propylene supply pressure remains above saturated vapor pressure, the propylene booster is activated. The temperature control device on the propylene tank regulates the steam control valve opening, achieving overall control of the booster. The heated propylene returns to the propylene tank, increasing its pressure and maintaining the feed pump outlet pressure at 1.3-1.5 MPa. This prevents supply fluctuations caused by propylene vaporization due to summer temperatures. During extended operation, when the propylene feed pump unit is under maintenance, the booster can be activated for pressure delivery to ensure uninterrupted production. Furthermore, the propylene delivery pipeline includes a branch returning to the propylene tank. This allows for rapid disconnection of the propylene supply from downstream units in case of emergencies, ensuring the propylene flows back to the tank and maintaining the stability of the propylene compound feeding system. Additionally, the return pipeline's control valve opening can be adjusted based on the feed pump outlet pressure during operation to ensure stable outlet pressure.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: The propylene composite feeding system of this utility model, by combining a booster and a feeding pump set, and assisting with different feeding pipelines and valves, saves steam consumption compared with pressure conveying methods, improves the stability of the propylene feeding pump set operation under different seasonal temperatures, and saves the construction and maintenance costs of the propylene buffer tank of the production unit; compared with pump conveying methods, it reduces the impact of propylene vaporization on system stability, avoids the propylene backflow problem caused by propylene vaporization, and achieves stable operation of the unit; at the same time, the separate pressure conveying and pump backflow pipelines improve the safety of subsequent units. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the propylene composite feeding system described in this utility model.
[0016] In the diagram: 1. Propylene spherical tank; 2. Propylene booster; 3. Propylene separator; 4. Feed pump A; 5. Feed pump B; 6. Radar level gauge; 7. Pressure gauge; 8. Temperature control device; 9. Steam delivery pipeline; 10. Steam control valve; 11. Steam output pipeline; 12. Wastewater pipeline; 13. Feed pump A shut-off valve; 14. Feed pump A pressure gauge; 15. Feed pump B shut-off valve; 16. Feed pump B pressure gauge; 17. Regulating valve; 18. Propylene delivery pipeline; 19. Control valve. Detailed Implementation
[0017] The specific technical solution of this utility model will be further described below with reference to the accompanying drawings.
[0018] like Figure 1 As shown, the propylene compound feeding system includes a propylene spherical tank 1, a propylene booster 2, and a propylene feed pump set. The bottom of the propylene spherical tank 1 is provided with a pipeline connected to the bottom of the propylene booster 2, and the top of the propylene booster 2 is provided with a pipeline returning to the propylene spherical tank 1. The bottom of the propylene spherical tank 1 is provided with a pipeline connected to the propylene feed pump set.
[0019] The propylene feed pump set consists of feed pump A4 and feed pump B5 connected in parallel. The outlet pipes of feed pump A4 and feed pump B5 are connected to the propylene conveying pipeline 18, which is used to transport liquid propylene to downstream devices. A branch line is provided at the bottom of the propylene spherical tank 1 directly connected to the propylene conveying pipeline 18. The propylene conveying pipeline 18 is provided with a branch line returning to the propylene spherical tank 1, and a control valve 19 is provided on the branch line.
[0020] The propylene spherical tank 1 is equipped with a radar level gauge 6, a pressure gauge 7, and a temperature control device 8.
[0021] The propylene booster 2 consists of two parts: a tube side and a shell side. The tube side is used to transport propylene, and the shell side is used to transport steam. The propylene and steam flow in countercurrent.
[0022] The upper shell inlet of the propylene booster 2 is connected to the steam conveying pipeline 9, and the lower shell outlet of the propylene booster 2 is connected to the steam output pipeline 11. A steam control valve 10 is installed on the steam conveying pipeline 9, and the steam control valve 10 and the temperature control device 8 form a control loop.
[0023] The bottom of the propylene spherical tank 1 is connected to the propylene water separator 3, the top of the propylene water separator 3 is provided with a pipeline connected to the propylene spherical tank 1, and the bottom of the propylene water separator 3 is connected to the sewage pipeline 12.
[0024] A feed pump A shut-off valve 13 is installed on the outlet pipe of feed pump A4, and a feed pump A pressure gauge 14 is installed after feed pump A shut-off valve 13; a feed pump B shut-off valve 15 is installed on the outlet pipe of feed pump B5, and a feed pump B pressure gauge 16 is installed after feed pump B shut-off valve 15.
[0025] A regulating valve 17 is installed on the propylene delivery pipeline 18.
[0026] The working process of the propylene composite feeding system is as follows: During the operation of the system, the state of propylene in the propylene spherical tank 1 can be determined by the radar level gauge 6, pressure gauge 7 and temperature control device 8 on the propylene spherical tank 1, which are affected by the external temperature. When the ambient temperature is low and the saturated vapor pressure of propylene is low, a feed pump group is used for transportation. Feed pump A4 and feed pump B5 operate with one running and the other on standby. When the pressure in the downstream unit is slightly higher than the outlet pressure of the feed pump, the pipeline connecting the propylene booster 2 and the propylene spherical tank 1 is in a connected state, and the steam control valve 10 on the steam transportation pipeline 9 is opened to heat the propylene. The heated propylene is returned to the propylene spherical tank 1 to pressurize it. The steam consumption is controlled by the temperature control device 8 on the propylene spherical tank 1. When the temperature exceeds the set process temperature, the steam consumption is reduced to prevent abnormal system pressure and affect propylene transportation. When the feed pump is in operation, the outlet pressure of the feed pump must be maintained at 1.0-1.2 MPa. When overpressure occurs, the opening of the control valve 19 is adjusted to return part of the propylene to the propylene spherical tank 1 to achieve rapid pressure reduction and ensure system stability.
[0027] Due to high summer temperatures, propylene tank 1 experiences high temperatures and pressures. To ensure the propylene supply pressure remains above saturated vapor pressure, propylene booster 2 is opened. The temperature control device 8 on propylene tank 1 is used to regulate the opening of steam control valve 10, achieving overall control of propylene booster 2. This ensures the feed pump outlet pressure is maintained at 1.3-1.5 MPa, preventing supply fluctuations caused by propylene vaporization due to high summer temperatures. When the feed pump unit is under maintenance after prolonged operation, propylene booster 2 can be opened to directly deliver propylene via pressure transport, ensuring uninterrupted production. Furthermore, propylene delivery pipeline 18 is equipped with a branch returning to propylene tank 1. This allows for rapid disconnection of propylene from downstream units in case of emergencies, with propylene flowing back to propylene tank 1, ensuring the stability of the propylene compound feeding system. Simultaneously, during unit operation, the opening of control valve 19 can be adjusted according to the feed pump outlet pressure to ensure stable feed pump outlet pressure.
Claims
1. A propylene composite feeding system, characterized in that, The propylene spherical tank (1), propylene booster (2), and propylene feed pump set are provided. The bottom of the propylene spherical tank (1) is provided with a pipeline connected to the bottom of the propylene booster (2) tube side, and the top of the propylene booster (2) tube side is provided with a pipeline for return flow to the propylene spherical tank (1). The bottom of the propylene spherical tank (1) is provided with a pipeline connected to the propylene feed pump set. The propylene feed pump set consists of feed pump A (4) and feed pump B (5) connected in parallel. The outlet pipes of feed pump A (4) and feed pump B (5) are connected to the propylene conveying pipeline (18). The bottom of the propylene spherical tank (1) is provided with a branch directly connected to the propylene conveying pipeline (18). The propylene conveying pipeline (18) is provided with a branch that returns to the propylene spherical tank (1), and a control valve (19) is provided on the branch.
2. The propylene composite feeding system according to claim 1, characterized in that, The propylene spherical tank (1) is equipped with a radar level gauge (6), a pressure gauge (7), and a temperature control device (8).
3. The propylene composite feeding system according to claim 2, characterized in that, The upper shell-side inlet of the propylene booster (2) is connected to the steam conveying pipeline (9), and the lower shell-side outlet of the propylene booster (2) is connected to the steam output pipeline (11). A steam control valve (10) is installed on the steam conveying pipeline (9).
4. The propylene composite feeding system according to claim 3, characterized in that, The steam control valve (10) and the temperature control device (8) form a control loop.
5. The propylene composite feeding system according to claim 1, characterized in that, The bottom of the propylene spherical tank (1) is connected to the propylene water separator (3), the top of the propylene water separator (3) is provided with a pipeline connected to the propylene spherical tank (1), and the bottom of the propylene water separator (3) is connected to the sewage pipeline (12).
6. The propylene compound feeding system according to claim 1, characterized in that, A feed pump A shut-off valve (13) is installed on the outlet pipe of the feed pump A (4), and a feed pump A pressure gauge (14) is installed after the feed pump A shut-off valve (13); a feed pump B shut-off valve (15) is installed on the outlet pipe of the feed pump B (5), and a feed pump B pressure gauge (16) is installed after the feed pump B shut-off valve (15).
7. The propylene composite feeding system according to claim 1, characterized in that, A regulating valve (17) is installed on the propylene delivery pipeline (18).