Propylene gasification device with high-precision temperature control

Abstract

The utility model belongs to propylene gasification technical field especially, it is propylene gasification device of high accuracy temperature control, including gasifier body, liquid phase propylene feed unit, steam heat exchange unit, gas phase propylene output unit and safety protection unit, gas phase propylene output unit includes gas phase propylene export pipeline, gas phase propylene export pipeline with gas phase space intercommunication, the outer surface of gas phase space is equipped with temperature transmitter and pressure transmitter. This propylene gasification device of high accuracy temperature control, through setting liquid level sensor, liquid phase propylene feed regulating valve, pressure transmitter, temperature transmitter, pressure indicating meter, temperature indicating meter and steam import regulating valve, and with PLC controller electricity is connected to adjust the opening of liquid phase propylene feed regulating valve and steam import regulating valve, when liquid level signal that liquid level sensor detects reaches the highest threshold value of prearrangement, then makes the PLC control system close liquid phase propylene feed regulating valve.

Description

Technical Field

[0001] This utility model relates to the field of propylene gasification technology, and in particular to a propylene gasification device with high-precision temperature control. Background Technology

[0002] As a core sealing component in modern centrifugal compressors, high-speed pumps, and other critical rotating equipment, the reliability of dry gas seals directly determines the safe and stable operation of the entire unit. The working principle of a dry gas seal involves injecting a stable, clean, and pressure-higher-than-process-medium-pressure isolation gas between the sealing surfaces, forming a rigid gas film a few micrometers thick between the rotating and stationary rings, thus achieving non-contact, zero-leakage operation. The use of gaseous propylene as a dry gas seal gas presents an extremely critical and demanding technical requirement: the outlet temperature of the vaporized propylene must be controlled with extreme precision and stability.

[0003] Under operating pressure, if the gas temperature is lower than the dew point temperature corresponding to that pressure, the propylene gas will condense into a liquid state. When tiny droplets or droplets enter the high-speed rotating dry gas sealing face with the gas flow, they can cause an imbalance in the force on the face due to instantaneous vaporization and expansion or impact, leading to oscillation, collision, or even dry friction on the sealing surface. This ultimately results in severe damage to the sealing face, seal failure, and significant process medium leakage and safety accidents. Therefore, propylene gas must be maintained at a sufficient temperature to ensure it remains in a stable gaseous state.

[0004] Currently, most commonly used propylene gasification and temperature control schemes employ simple single-loop control feedback. This control method suffers from lag, resulting in poor control accuracy, slow response speed, and difficulty in stabilizing the propylene outlet temperature within a precise range. Furthermore, ordinary shell-and-tube heat exchangers may have insufficient heat exchange area, leading to incomplete gasification. Therefore, this paper proposes a high-precision temperature-controlled propylene gasification device to achieve accurate control of the outlet temperature, ensuring that the propylene supplied to the dry gas seal is a stable, pure gaseous phase with a constant temperature, fundamentally eliminating safety hazards caused by inaccurate temperature control. Utility Model Content

[0005] Based on the aforementioned technical problems, this utility model proposes a propylene gasification device with high-precision temperature control.

[0006] This utility model proposes a high-precision temperature-controlled propylene gasification device, which includes a gasifier body, a liquid phase propylene feeding unit, a steam heat exchange unit, a gas phase propylene output unit, and a safety protection unit.

[0007] The vaporizer body is a vertical tank. The interior of the vaporizer body is divided into a gas phase space, a heat exchange space and a liquid phase space from top to bottom. The heat exchange space is equipped with stainless steel coaxial heat exchange tubes.

[0008] The liquid phase propylene feeding unit includes a liquid phase propylene inlet filter and a liquid phase propylene feed regulating valve. The liquid phase propylene inlet filter is connected to the liquid phase space of the gasifier body through a liquid phase propylene feed pipe, and the liquid phase propylene feed regulating valve is installed on the surface of the liquid phase propylene feed pipe.

[0009] The steam heat exchange unit includes a steam inlet filter, a steam inlet regulating valve, and a steam flow meter. The steam inlet filter is connected to the stainless steel coaxial heat exchange tube through a steam inlet pipe, and the steam inlet regulating valve and the steam flow meter are installed in the steam inlet pipe.

[0010] The gas phase propylene output unit includes a gas phase propylene outlet pipe, which is connected to the gas phase space. The outer surface of the gas phase space is equipped with a temperature transmitter and a pressure transmitter.

[0011] The safety protection unit includes a safety valve, which is disposed on the surface of the vaporizer body.

[0012] Preferably, the surface of the vaporizer body near the gas phase space is provided with a pressure indicator and a temperature indicator, and the pressure indicator and the temperature indicator form a dual monitoring system with the temperature transmitter and the pressure transmitter.

[0013] The above technical solution utilizes pressure and temperature transmitters to control the steam inlet regulating valve. When the outlet pressure or temperature is lower than the set value, the steam inlet regulating valve is opened wider; conversely, when it is higher, the steam inlet regulating valve is closed to bring the pressure to the set value and maintain stable operating conditions.

[0014] Preferably, a liquid level sensor is provided on the surface of the gasifier body, and the liquid level sensor is located at the junction of the liquid phase space and the heat exchange space. The liquid level signal of the liquid level sensor adjusts the opening degree of the liquid phase propylene feed regulating valve.

[0015] Through the above technical solution, the liquid level sensor and the liquid phase propylene feed regulating valve are electrically connected to the PLC controller. The liquid level signal detected by the liquid level sensor in real time is fed back to the PLC controller. The PLC controller dynamically adjusts the opening of the liquid phase propylene feed regulating valve according to the liquid level signal. When the liquid level signal detected by the liquid level sensor reaches the preset maximum threshold, which is 80% of the liquid phase space height, the PLC control system closes the liquid phase propylene feed regulating valve.

[0016] Preferably, the pressure signal from the pressure transmitter and the temperature signal from the temperature transmitter adjust the opening of the steam inlet regulating valve to switch between pressure control mode and temperature control mode.

[0017] Through the above technical solution, the pressure transmitter, temperature transmitter, and steam inlet regulating valve are all electrically connected to the PLC controller. The PLC controller selectively uses the pressure signal generated by the pressure transmitter or the temperature signal generated by the temperature transmitter as the main control variable according to the process requirements, thereby dynamically adjusting the opening of the steam inlet regulating valve. This enables flexible and precise switching between pressure control mode and temperature control mode for gaseous propylene, with the temperature signal being used as the primary control variable and the temperature range controlled within 50-55℃.

[0018] Preferably, the surface of the vaporizer body near the heat exchange space is connected to a condensate outlet pipe, and a condensate outlet pipe is installed on its surface.

[0019] The above technical solution utilizes the design of the condensate outlet pipe to facilitate the smooth and rapid discharge of condensate, and the steam trap is used to automatically and efficiently discharge the condensate generated inside the stainless steel coaxial heat exchange tube.

[0020] Preferably, the surfaces of the liquid propylene feed pipe, the steam inlet pipe, and the condensate outlet pipe are all provided with branch pipes with valves.

[0021] The above technical solution utilizes multiple valve-equipped branch pipelines to facilitate maintenance, while also serving as interfaces for cleaning, drainage, instrument calibration, or as backup, greatly enhancing the flexibility and convenience of operation and maintenance.

[0022] Preferably, the outer surface of the vaporizer body is provided with a support frame, and a ladder is mounted on the surface of the support frame.

[0023] Through the above technical solution, the installation frame provides stable support and positioning for the entire vaporizer body, and the ladder extends to the top platform of the vaporizer body, providing a safe and convenient passage for operators to inspect, maintain and operate the top instruments, valves and safety valves.

[0024] The beneficial effects of this utility model are as follows: 1. By setting stainless steel coaxial heat exchange tubes, the corrosion resistance is strong. At the same time, the coaxial sleeve structure enables efficient indirect heat exchange between steam and liquid propylene, ensuring that liquid propylene has sufficient residence time and heat exchange area in the gasifier, thereby improving heat exchange efficiency.

[0025] 2. By setting up a liquid level sensor, a liquid propylene feed regulating valve, a pressure transmitter, a temperature transmitter, a pressure indicator, a temperature indicator, and a steam inlet regulating valve, and electrically connecting them to the PLC controller, the opening degree of the liquid propylene feed regulating valve and the steam inlet regulating valve can be adjusted. When the liquid level signal detected by the liquid level sensor reaches the preset maximum threshold, the PLC control system will close the liquid propylene feed regulating valve to facilitate sufficient heat exchange between steam and liquid propylene in the gasifier body. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a high-precision temperature-controlled propylene gasification device proposed in this utility model. Figure 2 A three-dimensional view of the gas phase propylene outlet pipeline structure of a high-precision temperature-controlled propylene gasification device proposed in this utility model. Figure 3 A three-dimensional view of the steam inlet pipe structure of a high-precision temperature-controlled propylene gasification device proposed in this utility model; Figure 4 This is a three-dimensional view of the condensate outlet pipe structure of a high-precision temperature-controlled propylene gasification device proposed in this utility model. Figure 5 This is a three-dimensional view of the stainless steel coaxial heat exchange tube structure of a high-precision temperature-controlled propylene gasification device proposed in this utility model.

[0027] In the diagram: 1. Vaporizer body; 101. Stainless steel coaxial heat exchange tube; 2. Liquid phase propylene inlet filter; 21. Liquid phase propylene feed regulating valve; 22. Liquid phase propylene feed pipe; 3. Steam inlet filter; 31. Steam inlet regulating valve; 32. Steam flow meter; 33. Steam inlet pipe; 4. Gas phase propylene outlet pipe; 41. Temperature transmitter; 42. Pressure transmitter; 5. Safety valve; 6. Pressure gauge; 7. Temperature gauge; 8. Liquid level sensor; 9. Condensate outlet pipe; 10. Steam trap; 11. Branch pipe with valve; 12. Mounting frame; 13. Ladder. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] Reference Figures 1-5 A high-precision temperature-controlled propylene gasification device includes a gasifier body 1, a liquid propylene feeding unit, a steam heat exchange unit, a gas propylene output unit, and a safety protection unit.

[0030] The vaporizer body 1 is a vertical tank. The interior of the vaporizer body 1 is divided into a gas phase space, a heat exchange space and a liquid phase space from top to bottom. The heat exchange space is equipped with a stainless steel coaxial heat exchange tube 101.

[0031] By setting up a stainless steel coaxial heat exchange tube 101, which is made of 304 stainless steel, it has strong corrosion resistance. At the same time, by utilizing the coaxial sleeve structure, the steam and liquid propylene can carry out efficient indirect heat exchange, ensuring that the liquid propylene has sufficient residence time and heat exchange area in the vaporizer, thereby improving heat exchange efficiency.

[0032] The liquid phase propylene feeding unit includes a liquid phase propylene inlet filter 2 and a liquid phase propylene feeding regulating valve 21. The liquid phase propylene inlet filter 2 is connected to the liquid phase space of the gasifier body 1 through a liquid phase propylene feeding pipe 22, and the liquid phase propylene feeding regulating valve 21 is installed on the surface of the liquid phase propylene feeding pipe 22.

[0033] The steam heat exchange unit includes a steam inlet filter 3, a steam inlet regulating valve 31, and a steam flow meter 32. The steam inlet filter 3 is connected to the stainless steel coaxial heat exchange tube 101 through a steam inlet pipe 33. The steam inlet regulating valve 31 and the steam flow meter 32 are installed in the steam inlet pipe 33.

[0034] The gas phase propylene output unit includes a gas phase propylene outlet pipe 4, which is connected to the gas phase space. A temperature transmitter 41 and a pressure transmitter 42 are provided on the outer surface of the gas phase space.

[0035] The safety protection unit includes a safety valve 5, which is disposed on the surface of the vaporizer body 1.

[0036] To enable monitoring, a pressure indicator 6 and a temperature indicator 7 are respectively installed on the surface of the vaporizer body 1 near the gas phase space. The pressure indicator 6 and the temperature indicator 7, together with the temperature transmitter 41 and the pressure transmitter 42, form a dual monitoring system. The pressure transmitter 42 and the temperature transmitter 41 are used to control the steam inlet regulating valve. When the outlet pressure or temperature is lower than the set value, the steam inlet regulating valve is opened wider; conversely, when it is higher, the steam inlet regulating valve is closed to bring the pressure to the set value and maintain stable operating conditions.

[0037] To regulate the liquid propylene feed regulating valve 21, a liquid level sensor 8 is provided on the surface of the gasifier body 1. The liquid level sensor 8 is located at the junction of the liquid phase space and the heat exchange space. The liquid level signal of the liquid level sensor 8 regulates the opening of the liquid propylene feed regulating valve 21. The liquid level sensor 8 and the liquid propylene feed regulating valve 21 are electrically connected to the PLC controller. The liquid level signal detected by the liquid level sensor 8 in real time is fed back to the PLC controller. The PLC controller dynamically adjusts the opening of the liquid propylene feed regulating valve 21 according to the liquid level signal. When the liquid level signal detected by the liquid level sensor 8 reaches the preset maximum threshold, the PLC control system closes the liquid propylene feed regulating valve 21.

[0038] To regulate the steam inlet regulating valve 31, the pressure signal from the pressure transmitter 42 and the temperature signal from the temperature transmitter 41 are used to adjust the opening of the steam inlet regulating valve 31, thereby switching between pressure control mode and temperature control mode. The pressure transmitter 42, temperature transmitter 41, and steam inlet regulating valve 31 are all electrically connected to the PLC controller. The PLC controller selectively uses the pressure signal generated by the pressure transmitter 42 or the temperature signal generated by the temperature transmitter 41 as the main control variable according to process requirements, thereby dynamically adjusting the opening of the steam inlet regulating valve 31. This achieves flexible and precise switching between pressure control mode and temperature control mode for gaseous propylene, with the temperature signal being the primary control variable, and the temperature range controlled within 50-55℃.

[0039] By setting up a liquid level sensor 8, a liquid propylene feed regulating valve 21, a pressure transmitter 42, a temperature transmitter 41, a pressure indicator 6, a temperature indicator 7, and a steam inlet regulating valve 31, and electrically connecting them to a PLC controller, the opening of the liquid propylene feed regulating valve 21 and the steam inlet regulating valve 31 can be adjusted. When the liquid level signal detected by the liquid level sensor 8 reaches the preset maximum threshold, the PLC control system will close the liquid propylene feed regulating valve 21 to facilitate sufficient heat exchange between steam and liquid propylene in the gasifier body 1.

[0040] In order to quickly discharge condensate, a condensate outlet pipe 9 is connected to the surface of the vaporizer body 1 near the heat exchange space. A steam trap 10 is installed on the surface of the condensate outlet pipe 9. The design of the condensate outlet pipe 9 facilitates the smooth and rapid discharge of condensate. The steam trap 10 is used to automatically and efficiently discharge the condensate generated in the stainless steel coaxial heat exchange tube 101.

[0041] To facilitate maintenance and use, valved branch pipes 11 are installed on the surfaces of the liquid phase propylene feed pipe 22, steam inlet pipe 33, and condensate outlet pipe 9. The multiple valved branch pipes 11 facilitate maintenance and can also serve as cleaning, drainage, instrument calibration, or backup interfaces, greatly enhancing the flexibility and convenience of operation and maintenance.

[0042] To improve support and maintenance, a mounting frame 12 for support is provided on the outer surface of the vaporizer body 1. A ladder 13 is installed on the surface of the mounting frame 12. The mounting frame 12 provides stable support and positioning for the entire vaporizer body 1. The ladder 13 extends to the top platform of the vaporizer body 1, providing a safe and convenient passage for operators to inspect, maintain and operate the top instruments, valves and safety valve 5.

[0043] Working principle: During startup, first open the steam inlet pipe valve 33. After passing through the inlet filter, flow meter and regulating valve, the steam enters the stainless steel coaxial heat exchange tube 101 in the heat exchange space inside the gasifier body 1. After the stainless steel coaxial heat exchange tube 101 is preheated to 40°C, slowly open the liquid phase propylene feed regulating valve 21. After being filtered by the inlet filter, the liquid phase propylene enters the liquid phase space inside the gasifier body 1 through the liquid phase propylene feed pipe 22, where it exchanges heat with the liquid phase propylene, promoting the vaporization of the liquid phase propylene. The vaporized gaseous propylene is output through the gaseous propylene outlet pipe 4. The top safety valve 5 is activated to release pressure when the pressure is abnormal, ensuring the safety of the equipment and process throughout the process. Meanwhile, the level sensor 8 provides real-time feedback signals to dynamically adjust the opening of the feed regulating valve, controlling the liquid propylene level to be between 60% and 80% of the liquid phase space height; Temperature transmitter 41, pressure transmitter 42, pressure indicator 6, and temperature indicator 7 form a dual monitoring system. The signals are fed back to the PLC controller, which adjusts the opening of the steam inlet regulating valve 31 to switch between pressure and temperature control modes and maintain stable outlet parameters. First, the temperature signal is used as the main control variable. When the temperature transmitter 41 detects that the outlet temperature is below 50℃, it triggers the temperature control mode. The PLC controller outputs a signal to open the steam inlet regulating valve 31. When the pressure transmitter 42 detects that the outlet pressure is below 0.3MPa and the temperature is within the acceptable range, i.e., the temperature range is 50-55℃, it switches to the pressure control mode. The PLC controller dynamically adjusts the steam inlet regulating valve 31 according to the pressure difference. When shutting down, first close the liquid phase propylene feed regulating valve 21. After the liquid phase propylene in the gasifier body 1 is completely vaporized, close the steam inlet pipe valve 33. Finally, open the condensate outlet pipe valve 9 so that the condensate generated by heat exchange is discharged from the gasifier body 1 through the condensate outlet pipe 9 and the steam trap 10. Operators use ladder 13 to inspect, maintain, and operate the instruments, valves, and safety valve 5 on the top of the vaporizer body 1.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A propylene gasification device with high-precision temperature control, characterized in that: It includes the vaporizer body (1), liquid phase propylene feed unit, steam heat exchange unit, gas phase propylene output unit and safety protection unit; The vaporizer body (1) is a vertical tank. The interior of the vaporizer body (1) is divided into a gas phase space, a heat exchange space and a liquid phase space from top to bottom. The heat exchange space is equipped with a stainless steel coaxial heat exchange tube (101). The liquid phase propylene feeding unit includes a liquid phase propylene inlet filter (2) and a liquid phase propylene feeding regulating valve (21). The liquid phase propylene inlet filter (2) is connected to the liquid phase space through a liquid phase propylene feeding pipe (22). The liquid phase propylene feeding regulating valve (21) is installed on the surface of the liquid phase propylene feeding pipe (22). The steam heat exchange unit includes a steam inlet filter (3), a steam inlet regulating valve (31), and a steam flow meter (32). The steam inlet filter (3) is connected to the stainless steel coaxial heat exchange tube (101) through a steam inlet pipe (33). The steam inlet regulating valve (31) and the steam flow meter (32) are installed in the steam inlet pipe (33). The gas phase propylene output unit includes a gas phase propylene outlet pipe (4), which is connected to the gas phase space. The outer surface of the gas phase space is provided with a temperature transmitter (41) and a pressure transmitter (42). The safety protection unit includes a safety valve (5), which is disposed on the surface of the vaporizer body (1).

2. The propylene gasification device with high-precision temperature control according to claim 1, characterized in that: The vaporizer body (1) is provided with a pressure indicator (6) and a temperature indicator (7) on the surface near the gas phase space. The pressure indicator (6) and the temperature indicator (7) form a dual monitoring system with the temperature transmitter (41) and the pressure transmitter (42).

3. The propylene gasification device with high-precision temperature control according to claim 1, characterized in that: The surface of the gasifier body (1) is provided with a liquid level sensor (8), which is located at the junction of the liquid phase space and the heat exchange space. The liquid level signal of the liquid level sensor (8) adjusts the opening of the liquid phase propylene feed regulating valve (21).

4. The propylene gasification device with high-precision temperature control according to claim 1, characterized in that: The pressure signal from the pressure transmitter (42) and the temperature signal from the temperature transmitter (41) adjust the opening of the steam inlet regulating valve (31) to achieve the switching between pressure control mode and temperature control mode.

5. The propylene gasification device with high-precision temperature control according to claim 1, characterized in that: The surface of the vaporizer body (1) near the heat exchange space is connected to a condensate outlet pipe (9), and a condensate drain (10) is installed on the surface of the condensate outlet pipe (9).

6. The propylene gasification device with high-precision temperature control according to claim 5, characterized in that: The surfaces of the liquid propylene feed pipe (22), the steam inlet pipe (33), and the condensate outlet pipe (9) are all provided with valved branch pipes (11), and the valved branch pipes (11) are equipped with shut-off valves.

7. The propylene gasification device with high-precision temperature control according to claim 1, characterized in that: The outer surface of the vaporizer body (1) is provided with a support frame (12), and a ladder (13) is installed on the surface of the support frame (12).

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