Reaction kettle ethylene glycol temperature control unit with safety instrument system
By introducing an independent safety instrument system into the ethylene glycol temperature control unit, the safety risk problem caused by the failure of the PLC control circuit is solved, and the safety control of the reactor is realized.
Patent Information
- Application Number
- CN202422214937.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-10
AI Technical Summary
The ethylene glycol temperature control unit of the existing chemical synthetic raw material reactor lacks independent detection units and actuators in dangerous chemical processes, which leads to safety risks when the PLC control circuit fails.
An independent safety instrument system is installed outside the PLC system of the glycol temperature control unit, including steam and glycol shutdown valves, circulation pumps and temperature transmitters, forming an independent safety function circuit for emergency cooling.
It avoids the reaction out of control caused by PLC control loop failure, reduces safety risks, and ensures the safety of the reactor.
Smart Images
Figure CN223128012U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of fire hydrants, and specifically relates to a reaction kettle ethylene glycol temperature control unit with a safety instrument system. Background Technique
[0002] At present, a complete set of ethylene glycol temperature control units is used for chemical synthesis API reaction kettles, which can achieve precise temperature control inside the kettle. However, when used in key supervised hazardous chemical processes, due to the lack of an independent detection unit and actuator, it does not meet the requirements of safety supervision. When the PLC system of the original ethylene glycol temperature control unit fails, it will lead to a reaction out of control and cause safety risks.
[0003] Therefore, we have proposed a reaction kettle ethylene glycol temperature control unit with a safety instrument system. Outside the PLC system of the ethylene glycol temperature control unit, an independent safety instrument function loop is set up to avoid safety risks caused by the failure of the reaction due to the failure of the PLC control loop. Content of the Utility Model
[0004] The purpose of this utility model is to provide a reaction kettle ethylene glycol temperature control unit with a safety instrument system. Outside the PLC system of the ethylene glycol temperature control unit, an independent safety instrument function loop is set up to avoid safety risks caused by the failure of the reaction due to the failure of the PLC control loop.
[0005] The technical solution adopted by this utility model is specifically as follows:
[0006] A reaction kettle ethylene glycol temperature control unit with a safety instrument system, including a PLC system. The PLC system includes an ethylene glycol temperature control unit PLC system, a safety instrument system, and two temperature transmitters. One temperature transmitter is connected to the inside of the ethylene glycol temperature control unit PLC system, and the other temperature transmitter is connected to the inside of the safety instrument system;
[0007] The safety instrument system includes a steam SIS cut-off valve, an ethylene glycol outlet SIS cut-off valve, an ethylene glycol circulation pump, an SIS inlet cut-off valve, and an SIS outlet cut-off valve. The steam SIS cut-off valve and the ethylene glycol outlet SIS cut-off valve are respectively connected in series to the steam pipeline and the ethylene glycol outlet pipeline of the ethylene glycol temperature control unit PLC system. The SIS outlet cut-off valve is connected in parallel at the ethylene glycol return pipeline. The emergency stop signal of the ethylene glycol circulation pump is sent to the SIS, and the SIS inlet cut-off valve is connected in series in parallel to the bypass of the original ethylene glycol outlet pipeline with a pipeline.
[0008] Further, the PLC system of the ethylene glycol temperature control unit includes a steam heating pipeline and an ethylene glycol cooling pipeline. The steam heating pipeline includes an ethylene glycol outlet regulating valve, a three-way cut-off valve, a steam cut-off valve, a steam regulating valve, a pump body, and a reaction kettle. The ethylene glycol outlet regulating valve and one of the temperature transmitters are connected in series with the water outlet of the reaction kettle. The steam cut-off valve, the steam regulating valve, the three-way cut-off valve, and the other temperature transmitter are connected in series with the water inlet of the reaction kettle.
[0009] Further, the ethylene glycol cooling pipeline includes an ethylene glycol inlet cut-off valve. The ethylene glycol inlet cut-off valve, the pump body, and the three-way cut-off valve are connected in series with the water inlet of the reaction kettle.
[0010] Further, it also includes a heat exchanger and a control valve.
[0011] Further, multiple pump bodies are provided.
[0012] Further, an instrument is provided on the reaction kettle.
[0013] The technical effects achieved by this utility model are as follows:
[0014] By providing two temperature transmitters on the reaction kettle, one is connected to the PLC system of the ethylene glycol temperature control unit, and the other is connected to the safety instrument system. When the temperatures of the two temperature transmitters on the reaction kettle are too high, the steam SIS cut-off valve, the ethylene glycol outlet SIS cut-off valve, and the ethylene glycol circulation pump are turned off, and the ethylene glycol bypass SIS inlet cut-off valve and the SIS outlet cut-off valve are opened for emergency cooling. Outside the PLC system of the ethylene glycol temperature control unit, this utility model sets up an independent safety instrument function loop to avoid safety risks caused by the failure of the PLC control loop and the resulting reaction failure. Description of the Drawings
[0015] Figure 1 is the overall structural schematic diagram of this utility model;
[0016] In the drawings, the list of components represented by each reference numeral is as follows:
[0017] 1. Temperature transmitter; 12. Steam SIS cut-off valve; 13. Ethylene glycol outlet SIS cut-off valve; 14. Ethylene glycol circulation pump; 16. SIS inlet cut-off valve; 17. SIS outlet cut-off valve; 4. Ethylene glycol outlet regulating valve; 5. Three-way cut-off valve; 6. Steam cut-off valve; 7. Steam regulating valve; 8. Pump body; 9. Reaction kettle; 10. Ethylene glycol inlet cut-off valve. Detailed Embodiments
[0018] In order to make the purpose and advantages of the present utility clearer and more understandable, the following specifically describes the present utility in combination with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present utility, and does not strictly limit the scope of protection of the specific claims of the present utility.
[0019] As Figure 1 shown, the technical solution adopted by the present utility is specifically as follows: A reactor ethylene glycol temperature control unit with a safety instrument system, including a PLC system. The PLC system includes an ethylene glycol temperature control unit PLC system, a safety instrument system, and two temperature transmitters 1. One temperature transmitter 1 is connected to the inside of the ethylene glycol temperature control unit PLC system, and the other temperature transmitter 1 is connected to the inside of the safety instrument system;
[0020] The safety instrument system includes a steam SIS cut-off valve 12, an ethylene glycol outlet SIS cut-off valve 13, an ethylene glycol circulation pump 14, an SIS inlet cut-off valve 16, and an SIS outlet cut-off valve 17. The steam SIS cut-off valve 12 and the ethylene glycol outlet SIS cut-off valve 13 are respectively connected in series to the steam pipeline and the ethylene glycol outlet pipeline of the ethylene glycol temperature control unit PLC system. The SIS outlet cut-off valve 17 is connected in parallel at the ethylene glycol return pipeline. The emergency stop signal of the ethylene glycol circulation pump 14 is sent to the SIS, and the SIS inlet cut-off valve 16 is connected in series to bypass the original ethylene glycol outlet pipeline with a pipeline.
[0021] Its working principle is: When the temperatures of the two temperature transmitters 1 on the reactor 9 are too high, the steam SIS cut-off valve 12, the ethylene glycol outlet SIS cut-off valve 13, and the ethylene glycol circulation pump 14 are opened, and the ethylene glycol bypass SIS inlet cut-off valve 16 and the SIS outlet cut-off valve 17 are opened for emergency cooling.
[0022] The ethylene glycol temperature control unit PLC system includes a steam heating pipeline and an ethylene glycol cooling pipeline. The steam heating pipeline includes an ethylene glycol outlet regulating valve 4, a three-way cut-off valve 5, a steam cut-off valve 6, a steam regulating valve 7, a pump body 8, and a reactor 9. The ethylene glycol outlet regulating valve 4 and one of the temperature transmitters 1 are connected in series to the outlet of the reactor 9. The steam cut-off valve 6, the steam regulating valve 7, the three-way cut-off valve 5, and the other temperature transmitter 1 are connected in series to the inlet of the reactor 9;
[0023] During heating, the ethylene glycol outlet regulating valve 4 is closed, the three-way cut-off valve 5 is connected in the vertical direction, the steam cut-off valve 6 is opened, and the opening degree of the steam regulating valve 7 is controlled to heat the ethylene glycol. The ethylene glycol circulates inside the TCU through the pump body 8 to heat the reactor 9.
[0024] The ethylene glycol cooling pipeline includes an ethylene glycol inlet cut-off valve 10, an ethylene glycol inlet cut-off valve 10, a pump body 8, and a three-way cut-off valve 5 connected in series to the inlet of the reactor 9.
[0025] During cooling, the three-way cut-off valve 5 is connected horizontally, the ethylene glycol inlet cut-off valve 10 is opened, and the opening degree of the ethylene glycol outlet regulating valve 4 is adjusted to control the amount of low-temperature ethylene glycol entering the unit, and the reaction kettle 9 is cooled by circulating through the pump body 8.
[0026] It also includes a heat exchanger and a control valve. The function of the heat exchanger is to exchange heat, so as to cool down and heat up. The control valve is an electric control valve to control the flow of ethylene glycol.
[0027] There are multiple pump bodies 8, and each pump body 8 controls a system. For example, the ethylene glycol circulation pump 14 in the present utility model controls the flow of ethylene glycol, and there is also a steam circulation pump to control the flow of steam.
[0028] Instruments are provided on the reaction kettle 9. Here, the instruments are specifically pressure gauges, thermometers, etc., which can detect the pressure, temperature and other values of the reaction kettle 9.
[0029] The working principle of the present utility model is as follows: when the temperatures of the two temperature transmitters 1 on the reaction kettle 9 are too high, the steam SIS cut-off valve 12, the ethylene glycol outlet SIS cut-off valve 13, and the ethylene glycol circulation pump 14 are closed, and the ethylene glycol bypass SIS inlet cut-off valve 16 and the SIS outlet cut-off valve 17 are opened for emergency cooling. Outside the PLC system of the ethylene glycol temperature control unit of the present utility model, an independent safety instrument function loop is set up to avoid safety risks caused by the failure of the PLC control loop and the resulting reaction failure.
[0030] The above is only the preferred implementation mode of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model. The structures, devices and operation methods not specifically described and explained in the present utility model are implemented according to the conventional means in this field without special instructions and limitations.
Claims
1. A reactor ethylene glycol temperature control unit with a safety instrument system, including a PLC system, characterized in that: The PLC system includes an ethylene glycol temperature control unit PLC system, a safety instrument system, and two temperature transmitters (1). One of the temperature transmitters (1) is connected to the inside of the ethylene glycol temperature control unit PLC system, and the other temperature transmitter (1) is connected to the inside of the safety instrument system; The safety instrument system includes a steam SIS cut-off valve (12), an ethylene glycol outlet SIS cut-off valve (13), an ethylene glycol circulation pump (14), an SIS inlet cut-off valve (16), and an SIS outlet cut-off valve (17). The steam SIS cut-off valve (12) and the ethylene glycol outlet SIS cut-off valve (13) are respectively connected in series to the steam pipeline and the ethylene glycol outlet pipeline of the ethylene glycol temperature control unit PLC system. The SIS outlet cut-off valve (17) is connected in parallel at the ethylene glycol return pipeline. The emergency stop signal of the ethylene glycol circulation pump (14) is sent to the SIS, and the SIS inlet cut-off valve (16) is connected in series in bypass to the original ethylene glycol outlet pipeline with a pipeline.
2. The reactor ethylene glycol temperature control unit with a safety instrument system according to claim 1, characterized in that: The ethylene glycol temperature control unit PLC system includes a steam heating pipeline and an ethylene glycol cooling pipeline. The steam heating pipeline includes an ethylene glycol outlet regulating valve (4), a three-way cut-off valve (5), a steam cut-off valve (6), a steam regulating valve (7), a pump body (8), and a reaction kettle (9). The ethylene glycol outlet regulating valve (4) and one of the temperature transmitters (1) are connected in series to the water outlet of the reaction kettle (9). The steam cut-off valve (6), the steam regulating valve (7), the three-way cut-off valve (5), and the other temperature transmitter (1) are connected in series to the water inlet of the reaction kettle (9).
3. The reactor ethylene glycol temperature control unit with a safety instrument system according to claim 2, characterized in that: The ethylene glycol cooling pipeline includes an ethylene glycol inlet cut-off valve (10). The ethylene glycol inlet cut-off valve (10), the pump body (8), and the three-way cut-off valve (5) are connected in series to the water inlet of the reaction kettle (9).
4. The reactor ethylene glycol temperature control unit with a safety instrument system according to claim 1, characterized in that: It also includes a heat exchanger and a control valve.
5. The reactor ethylene glycol temperature control unit with a safety instrument system according to claim 2, characterized in that: Multiple pump bodies (8) are provided.
6. The reactor ethylene glycol temperature control unit with a safety instrument system according to claim 2, characterized in that: An instrument is provided on the reaction kettle (9).