Main cooler reaction system of styrene device
By vaporizing and absorbing heat under negative pressure conditions and injecting quench water to reduce the inlet temperature of the styrene main cooler, the problem of high-temperature polymerization and blockage of styrene is solved, and the long-term stable operation of the device is achieved.
Patent Information
- Application Number
- CN202422224011.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-11
AI Technical Summary
The styrene components in the styrene device are prone to polymerization at high temperatures, resulting in clogging of pipelines and equipment. The existing process design temperature is 128°C, which poses a risk of damage to the styrene main cooler.
The process condensate is used to vaporize and absorb heat under negative pressure conditions, and the inlet material temperature of the styrene main cooler is reduced to 59°C to avoid high-temperature polymerization.
It effectively reduces the risk of styrene polymerization and ensures stable operation of the device for a long period of time.
Smart Images
Figure CN223159231U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of styrene operation, and particularly relates to a main condenser reaction system of a styrene plant. Background Art
[0002] The ethylbenzene dehydrogenation reaction liquid in the styrene plant contains 64% styrene. The styrene component is prone to high-temperature polymerization to form polystyrene, resulting in blockage of pipelines and equipment. The existing process design temperature is 128°C before entering the main condenser E-205 of styrene, there is a risk of styrene polymerization, which may damage the main condenser of styrene. Content of the Utility Model
[0003] The utility model provides a main condenser reaction system of a styrene plant, aiming to use the vaporization heat absorption of process condensate under negative pressure conditions to reduce the temperature of the inlet material of the main condenser of styrene, and ensure the long-term stable operation of the plant.
[0004] To achieve this purpose, the utility model adopts the following technical solutions: A main condenser reaction system of a styrene plant includes a second dehydrogenation reactor, a main condenser of styrene, a process condensate pump, a triple heat exchanger, a crude styrene settling tank, a condensate stripping tower condenser and a condensate stripping tower; the outlet pipeline of the second dehydrogenation reactor is connected to the inlet of the triple heat exchanger; the outlet pipeline of the triple heat exchanger is connected to the first inlet of the main condenser of styrene; the outlet pipeline of the main condenser of styrene is connected to the inlet of the crude styrene settling tank; the crude styrene settling tank includes an oil phase chamber and a water phase chamber; the outlet pipeline of the water phase chamber of the crude styrene settling tank is connected to the inlet of the process condensate pump; the first outlet pipeline of the process condensate pump is connected to the first inlet of the condensate stripping tower condenser; the second outlet pipeline of the process condensate pump is connected to the outlet pipeline of the triple heat exchanger; the first outlet pipeline of the condensate stripping tower condenser is connected to the second inlet of the main condenser of styrene; the second outlet pipeline of the condensate stripping tower condenser is connected to the inlet of the condensate stripping tower; the first outlet pipeline of the condensate stripping tower is connected to outside the plant; the second outlet pipeline of the condensate stripping tower is connected to the second inlet of the condensate stripping tower condenser.
[0005] Further, a water phase valve one is arranged at the outlet of the crude styrene settling tank; a water phase valve two and a water phase filter are arranged on the outlet pipeline of the water phase chamber of the crude styrene settling tank; the water phase valve two is arranged in front of the water phase filter.
[0006] Further, a drain one and a drain two are arranged on the first outlet pipeline of the process condensate pump; a feed valve one is arranged at the rear end of the drain one; a check valve is arranged at the outlet of the process condensate pump; a cross line is arranged from the front end to the rear end of the check valve; a cross line valve is arranged on the cross line.
[0007] Further, the second outlet pipeline of the process condensate pump is arranged between the first drain and the second drain.
[0008] Further, a regulating valve group and a flowmeter are arranged on the second outlet pipeline of the process condensate pump; the flowmeter is arranged at the front end of the regulating valve group; a feed filter is arranged at the front end of the flowmeter; a feed valve two is arranged at the outlet of the second outlet pipeline of the process condensate pump.
[0009] Further, a thermometer is arranged at the inlet of the styrene main cooler.
[0010] Further, the thermometer and the flowmeter control the opening degree of the regulating valve group through signal connection.
[0011] Further, a condensate valve one is arranged on the first outlet pipeline of the condensate stripping tower condenser.
[0012] Further, a condensate valve two is arranged on the second outlet pipeline of the condensate stripping tower condenser.
[0013] The beneficial effects of the present utility model are as follows: Utilize the heat absorption of process condensate under negative pressure conditions to reduce the temperature of the material at the inlet of the styrene main cooler. Inject a stream of 13 t / h of chilled water into the pipeline through a spray head, reduce the initial temperature of 128 °C to 59 °C, reduce the risk of styrene polymerization blocking the heat exchanger, and ensure the long-term stable operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a schematic structural diagram of the present utility model.
[0015] In the figure: 1. Second dehydrogenation reactor, 2. Triple heat exchanger, 3. Styrene main cooler, 4. Crude styrene settling tank, 5. Process condensate pump, 6. Condensate stripping tower condenser, 7. Condensate stripping tower, 8. Outlet pipeline of the second dehydrogenation reactor, 9. Outlet pipeline of the triple heat exchanger, 10. Outlet pipeline of the styrene main cooler, 11. Outlet pipeline of the aqueous phase chamber of the crude styrene settling tank, 12. First outlet pipeline of the process condensate pump, 13. Second outlet pipeline of the process condensate pump, 14. First outlet pipeline of the condensate stripping tower condenser, 15. Second outlet pipeline of the condensate stripping tower condenser, 16. First outlet pipeline of the condensate stripping tower, 17. Second outlet pipeline of the condensate stripping tower, 18. Aqueous phase valve one, 19. Aqueous phase valve two, 20. Aqueous phase filter, 21. Check valve, 22. Cross line, 23. Cross line valve, 24. First drain, 25. Feed valve one, 26. Second drain, 27. Regulating valve group, 28. Flowmeter, 29. Feed filter, 30. Feed valve two, 31. Thermometer, 32. Condensate valve one; 33. Condensate valve two. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0016] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.
[0017] Refer to the attached Figure 1 As shown, a reaction system of a main cooler in a styrene plant includes a second dehydrogenation reactor 1, a styrene main cooler 3, a process condensate pump 5, a triple heat exchanger 2, a crude styrene settling tank 4, a condensate stripping tower condenser 6, and a condensate stripping tower 7; the outlet pipeline 8 of the second dehydrogenation reactor is connected to the inlet of the triple heat exchanger 2; the outlet pipeline 9 of the triple heat exchanger is connected to the first inlet of the styrene main cooler 3; the outlet pipeline 10 of the styrene main cooler is connected to the inlet of the crude styrene settling tank 4; the crude styrene settling tank includes an oil phase chamber and a water phase chamber; the outlet pipeline 11 of the water phase chamber of the crude styrene settling tank is connected to the inlet of the process condensate pump 5; the first outlet pipeline 12 of the process condensate pump is connected to the first inlet of the condensate stripping tower condenser 6; the second outlet pipeline 13 of the process condensate pump is connected to the outlet pipeline 9 of the triple heat exchanger; the first outlet pipeline 14 of the condensate stripping tower condenser is connected to the second inlet of the styrene main cooler 3; the second outlet pipeline 15 of the condensate stripping tower condenser is connected to the inlet of the condensate stripping tower 7; the first outlet pipeline 16 of the condensate stripping tower is connected to outside the plant; the second outlet pipeline 17 of the condensate stripping tower is connected to the second inlet of the condensate stripping tower condenser 6.
[0018] Further, a first water phase valve 18 is provided at the outlet of the crude styrene settling tank 4; a second water phase valve 19 and a water phase filter 20 are provided on the outlet pipeline 11 of the water phase chamber of the crude styrene settling tank; the second water phase valve 19 is provided at the front end of the water phase filter 20.
[0019] Further, a first drain 24 and a second drain 26 are provided on the first outlet pipeline 12 of the process condensate pump; a first feed valve 25 is provided at the rear end of the first drain 24; a check valve 21 is provided at the outlet of the process condensate pump 5; a cross line 22 is provided from the front end to the rear end of the check valve 21; a cross line valve 23 is provided on the cross line 22.
[0020] Further, the second outlet pipeline 13 of the process condensate pump is provided between the first drain 24 and the second drain 26.
[0021] Further, a regulating valve group 27 and a flow meter 28 are provided on the second outlet pipeline 13 of the process condensate pump; the flow meter 28 is provided at the front end of the regulating valve group 27; a feed filter 29 is provided at the front end of the flow meter 28; a second feed valve 30 is provided at the outlet of the second outlet pipeline 13 of the process condensate pump.
[0022] Furthermore, a thermometer 31 is provided at the inlet of the styrene main cooler 3.
[0023] Furthermore, the thermometer 31 and the flowmeter 28 are signal-connected to control the opening degree of the regulating valve group 27.
[0024] It should be noted that the thermometer 31 and the flowmeter 28 transmit the size of the regulating valve position through signals.
[0025] Furthermore, a first condensation valve 32 is provided on the first outlet pipeline 14 of the condensate stripping tower condenser.
[0026] Furthermore, a second condensation valve 33 is provided on the second outlet pipeline 15 of the condensate stripping tower condenser.
[0027] It should be noted that during the actual operation of the styrene plant, it is found that the tube side of the styrene main cooler (E-205) is seriously blocked, and the blockage is mainly styrene high-temperature polymer. It is planned to add a quench cooler process flow at the inlet of the main cooler (E-205) in the dehydrogenation unit to achieve the purpose of reducing the inlet temperature of the styrene main cooler (E-205). The inlet temperature of the styrene main cooler (E-205) is reduced from 128 °C to 59 °C to avoid blockage of the pipeline by styrene high-temperature polymerization in the E-205 tube bundle.
[0028] Using the process condensate produced by the plant, a new pipeline and nozzle are added from the outlet of the condensate stripping tower 7 feed pump (P-203) and injected into the inlet of the styrene main cooler (E-205). The process condensate vaporizes and absorbs heat under negative pressure conditions to reduce the temperature of the inlet material of the styrene main cooler (E-205).
Claims
1. A main cooler reaction system for a styrene unit, characterized in that: It includes a second dehydrogenation reactor, a styrene main cooler, a process condensate pump, a triple heat exchanger, a crude styrene settling tank, a condensate stripping tower condenser and a condensate stripping tower; the outlet pipeline of the second dehydrogenation reactor is connected to the inlet of the triple heat exchanger; the outlet pipeline of the triple heat exchanger is connected to the first inlet of the styrene main cooler; the outlet pipeline of the styrene main cooler is connected to the inlet of the crude styrene settling tank; the crude styrene settling tank includes an oil phase chamber and a water phase chamber; the outlet pipeline of the water phase chamber of the crude styrene settling tank is connected to the inlet of the process condensate pump; the first outlet pipeline of the process condensate pump is connected to the first inlet of the condensate stripping tower condenser; the second outlet pipeline of the process condensate pump is connected to the outlet pipeline of the triple heat exchanger; the first outlet pipeline of the condensate stripping tower condenser is connected to the second inlet of the styrene main cooler; the second outlet pipeline of the condensate stripping tower condenser is connected to the inlet of the condensate stripping tower; the first outlet pipeline of the condensate stripping tower is connected to outside the plant; the second outlet pipeline of the condensate stripping tower is connected to the second inlet of the condensate stripping tower condenser.
2. The main cooler reaction system of a styrene plant according to claim 1, wherein: A water phase valve one is arranged at the outlet of the crude styrene settling tank; a water phase valve two and a water phase filter are arranged on the outlet pipeline of the water phase chamber of the crude styrene settling tank; the water phase valve two is arranged in front of the water phase filter.
3. The main cooler reaction system of a styrene plant according to claim 2, characterized in that: A drain one and a drain two are arranged on the first outlet pipeline of the process condensate pump; a feed valve one is arranged at the rear end of the drain one; a check valve is arranged at the outlet of the process condensate pump; a cross line is arranged from the front end to the rear end of the check valve; a cross line valve is arranged on the cross line.
4. The main cooler reaction system of a styrene plant according to claim 3, characterized in that: The second outlet pipeline of the process condensate pump is arranged between the drain one and the drain two.
5. A main cooler reaction system of a styrene plant according to any one of claims 1-4, characterized in that: A regulating valve group and a flowmeter are arranged on the second outlet pipeline of the process condensate pump; the flowmeter is arranged at the front end of the regulating valve group; a feed filter is arranged at the front end of the flowmeter; a feed valve two is arranged at the outlet of the second outlet pipeline of the process condensate pump.
6. The main cooler reaction system of a styrene plant according to claim 5, characterized in that: A thermometer is arranged at the inlet of the styrene main cooler.
7. The main cooler reaction system of a styrene plant according to claim 6, characterized in that: The thermometer and the flowmeter are connected by signals to control the opening degree of the regulating valve group.
8. The main cooler reaction system of a styrene plant according to claim 1, characterized in that: A condensation valve one is arranged on the first outlet pipeline of the condensate stripping tower condenser.
9. The reaction system of the main cooler of a styrene unit according to claim 1, wherein: A condensation valve two is arranged on the second outlet pipeline of the condensate stripping tower condenser.