A precise temperature control device for kettle reactor with prediction function

Abstract

A precise temperature control device for a kettle reactor with a prediction function belongs to the technical field of fine chemical temperature control. It includes an integrated controller, a feed control module, a main temperature control loop, a correction temperature control loop, a safety interlock module and a reaction system. The integrated controller can input basic data such as the optimal temperature rise curve of the reaction, the heat of reaction, and perform data interaction processing to control the feed rate and the temperature control loop. In view of the problem that the traditional temperature control system controls the temperature in the kettle based on the temperature change in the kettle, thus producing a lag effect and resulting in low temperature control accuracy; by adopting a main temperature control loop based on a large amount of experimental data and an anti-disturbance correction temperature control loop, precise control of the temperature of the kettle reactor with a prediction function is achieved. After adopting the utility model, the temperature control accuracy of the kettle reactor is greatly improved, thereby reducing the side reactions of the reaction system, reducing the reaction time, improving the utilization rate of raw materials and energy, and enhancing safety.

Description

Technical Field

[0001] The utility model belongs to the technical field of fine chemical temperature control, and in particular relates to a precise temperature control device for a kettle reactor with a prediction function. Background Art

[0002] Chemical reaction is the core process of the chemical industry, and reaction temperature is an important process parameter that directly affects technical and economic indicators such as chemical reaction conversion rate, reaction speed, reaction yield, and product quality. Reaction temperature is affected by many factors such as material type, reaction type, drip acceleration rate, stirring conditions, equipment heat exchange capacity, etc. The accuracy and stability of reactor temperature control are crucial to industrial production.

[0003] The principle of reactor temperature control is to adjust the temperature inside the reactor by controlling the reactor's cold and hot medium system. The temperature sensor inside the reactor measures the temperature inside the reactor, and the measured value is transmitted to the controller; the controller instructs the actuator to control the cold and hot medium system according to the difference between the preset temperature value and the measured result to achieve the purpose of temperature control.

[0004] At present, the commonly used temperature control method for kettle reactors is as follows: for systems with small heat release or heat absorption, actuators such as regulating valves or switch valves are generally set on the cold and hot medium system, and the temperature in the kettle is measured by the temperature sensor in the kettle and compared with the preset temperature through the controller, and the opening of the regulating valve of the cold and hot medium system is adjusted or the opening and closing of the switch valve is controlled to achieve the purpose of stabilizing the temperature in the kettle; for systems with relatively large heat release or heat absorption, such as chemical reaction systems with relatively high reaction heat, the cold and hot medium system is fully open during the reaction process, and regulating valves and other actuators are set on the reactant feed dripping pipeline, and the temperature in the kettle is measured by the temperature sensor in the kettle and compared with the preset temperature through the controller, and the opening of the dripping regulating valve is adjusted to control the dripping rate and then control the reaction rate and the heat release (absorption) of the reaction, so as to achieve the purpose of stabilizing the temperature in the kettle.

[0005] The final instruction source of the temperature control main loop of these two temperature control methods is the temperature measurement value inside the reactor. Although the temperature fluctuation inside the reactor can be kept within a certain range, the temperature adjustment has a certain lag because the variable to be controlled is also the input parameter of its control loop, and the temperature control accuracy is not high. For chemical reaction systems with relatively high reaction heat, constantly adjusting the dripping rate of materials will also make the reaction process unstable, resulting in uncontrollable reaction progress and obstacles to precise temperature control.

[0006] The stabilization of the temperature of the reaction system can not only reduce the side reactions in the chemical reaction process and improve the utilization rate of raw materials, but also improve the safety of the process and the overall energy utilization rate, which is of positive significance to the improvement of chemical technology. Utility Model Content

[0007] In view of the problems existing in the prior art, the variables to be adjusted are used as input parameters, and are passively adjusted according to their changes, which makes the temperature control in the kettle lag and the temperature control accuracy is not high; and the feed rate changes from time to time according to the temperature conditions in the kettle, making the reaction process uncontrollable. The purpose of this utility model is to provide a precise temperature control device for a kettle reactor with a prediction function, which improves the initiative of temperature control, facilitates the control of the reaction process, increases the reaction rate, reduces side reactions, improves the utilization rate of raw materials, and increases process safety.

[0008] The utility model provides the following technical solutions: a precise temperature control device for a kettle reactor with a prediction function, comprising an integrated controller for performing data interaction processing, controlling a feed rate and a temperature control loop, a feed control module for receiving an instruction from the integrated controller to control the instantaneous flow of materials in a feed pipeline to meet setting requirements, providing heat exchange for temperature control of a reaction process, a control data source being related to reaction data input to the integrated controller, a main temperature control loop for temperature control with a prediction function being implemented according to the input data, a control input data coming from the measured temperature in a reaction system, a correction temperature control loop for anti-disturbance, a safety interlock module for preventing overflow of materials in the reaction system, providing cooling capacity, and preventing explosion of the reaction system, and a reaction system; the reaction system comprises a reactor.

[0009] Furthermore, the integrated controller includes functional modules corresponding to data input storage, feed control, main temperature control, correction temperature control, safety interlock and data interaction processing.

[0010] Furthermore, the feed control module includes a feed pipeline for adding reactants into the reactor, and a feed flow meter FIQC102 and a feed regulating valve FV102 are provided on the feed pipeline.

[0011] Furthermore, the main temperature control circuit includes a main circuit cold and hot medium inlet pipe and a main circuit cold and hot medium outlet pipe connected to the reactor; the main circuit cold and hot medium inlet pipe is provided with an inlet pipe thermometer TIS102, a main circuit temperature control flowmeter FIQC101 and a main circuit temperature control regulating valve FV101; the main circuit cold and hot medium outlet pipe is provided with an outlet pipe thermometer TIS103.

[0012] Furthermore, the reaction system includes a solvent feed pipe, other reactant feed pipes, a product discharge pipe and a gas phase pipeline connected to the reactor.

[0013] Furthermore, the correction temperature control loop includes a correction loop cold and hot medium inlet pipe connected to the reactor, a correction loop cold and hot medium outlet pipe, a reaction system thermometer TIASC101 arranged on the reactor pipe mouth, and a correction loop temperature control regulating valve TV101 arranged on the correction loop cold and hot medium inlet pipe.

[0014] Furthermore, the safety interlock module includes a drip feed cut-off valve XV101 arranged on the feed pipe, a solvent feed cut-off valve XV102 arranged on the solvent feed pipe, an other reactant feed cut-off valve XV103 arranged on the other reactant feed pipes, a reaction system liquid level switch LAS101 arranged on the reactor pipe mouth, a reaction system pressure transmitter PIAS101 arranged on the reactor pipe mouth or on the gas phase pipeline, a refrigerant inlet bypass switch valve XV105, a refrigerant inlet cut-off valve XV104 and a heat medium inlet cut-off valve XV106 arranged on the main circuit cold and hot medium inlet pipes, and a refrigerant outlet cut-off valve XV107 and a heat medium outlet cut-off valve XV108 arranged on the main circuit cold and hot medium outlet pipes.

[0015] Furthermore, the reactor adopts two independent public engineering medium channels.

[0016] Furthermore, the heat medium flowing through the main circuit cold and hot medium inlet pipe and the main circuit cold and hot medium outlet pipe is one of heat transfer oil, steam or hot water; the refrigerant is one of circulating water, 7-degree water, refrigerated ethylene glycol aqueous solution or refrigerated calcium chloride aqueous solution; the correction circuit cold and hot medium inlet pipe and the correction circuit cold and hot medium outlet pipe are provided with switch valves for switching cold and hot medium.

[0017] Furthermore, the temperature at the heat medium inlet is 50°C to 230°C, and the temperature at the cold medium inlet is -35°C to 32°C.

[0018] By adopting the above technology, compared with the prior art, the beneficial effects of the utility model are as follows:

[0019] 1) The utility model abandons the traditional temperature control method that uses the temperature in the kettle as the data source, and instead uses the reaction heat data obtained from the experiment as the original control parameter. The relationship between the cumulative amount of feed added and the amount of heat transfer required by the system is preset in advance in the integrated controller. The required instantaneous flow of cold and hot media is calculated in real time according to the heat transfer and the inlet and outlet temperature difference of the cold and hot media pipelines in the main circuit, and the opening of the regulating valve of the cold and hot media system in the main circuit is controlled to maintain the required flow, so as to achieve the effect that the heat exchange provided by the cold and hot media system in the main circuit matches the heat transfer required under the current reaction process, thereby realizing true temperature control with prediction function;

[0020] 2) The dripping acceleration rate of the reactants of the utility model is no longer related to the operating conditions in the kettle, but is actively adjusted according to production needs, which can better control the process and facilitate actual production scheduling; at the same time, the integrated controller includes a function of automatically judging whether the maximum heat exchange capacity of the device can meet the heat exchange requirements under the most unfavorable conditions of the process, so that the actively set dripping acceleration rate will not exceed the standard, ensuring the process safety under normal working conditions;

[0021] 3) The utility model is provided with a temperature control correction loop, which provides a small heat exchange capacity, effectively prevents disturbances caused by accidental factors without affecting the prediction function of the main temperature control loop, and further improves the temperature control accuracy of the device;

[0022] 4) The utility model systematically integrates various control pipelines and instrument valves to achieve modularization and standardization, which greatly reduces the footprint of the entire device. Different cold and hot media can be connected to different reaction systems to meet the requirements of different reaction temperatures and heat exchange capacities. The equipment has a high degree of integration and provides a standardized, modular, precise temperature control device for kettle reactors. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments of the specification. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] On the contrary, the present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention. Those skilled in the art can fully understand the present invention without the description of these details.

[0026] See also Figure 1 A precise temperature control device for a kettle reactor with a prediction function comprises an integrated controller a, a feed control module b, a main temperature control loop c, a correction temperature control loop d, a safety interlock module e and a reaction system.

[0027] Specifically, the integrated controller a includes functional blocks such as data input storage, feed control, main temperature control, correction temperature control, safety interlock and data interaction processing; the data that can be input include the maximum heat exchange area that can be provided by the heat exchange area of ​​the device itself and the diameter of the public engineering pipe, the instantaneous heat exchange data required under different cumulative drop amounts of the reaction process to be carried out, and the optimal temperature rise curve of the reaction process to be carried out, and it can automatically determine whether the maximum heat exchange capacity of the device can meet the heat exchange requirements under the most unfavorable conditions of the process based on the input basic reaction data.

[0028] When using the device of this embodiment, the reaction heat data obtained from the experiment can be input into the integrated controller a as the original control parameter. Based on the relationship between the cumulative amount of feed added and the amount of heat transfer required by the system, the required instantaneous flow rate of the cold and hot medium can be calculated in real time according to the heat transfer and the inlet and outlet temperature difference of the cold and hot medium pipelines of the main circuit, and the opening of the regulating valve of the cold and hot medium system of the main circuit can be controlled to maintain the required flow rate, so as to achieve the effect of matching the heat exchange provided by the cold and hot medium system of the main circuit with the heat transfer required under the current reaction process, thereby realizing temperature control with prediction function.

[0029] The device of this embodiment can adjust the dripping acceleration rate according to actual production needs to better control the process progress; the integrated controller a also includes a function of automatically determining whether the maximum heat exchange capacity of the device can meet the heat exchange requirements under the most unfavorable conditions of the process, so that the actively set dripping acceleration rate will not exceed the standard, ensuring the process safety under normal working conditions.

[0030] Specifically, the feed control module b includes a feed pipeline b1, a feed flow meter FIQC102 and a feed regulating valve FV102. The feed flow meter FIQC102 receives instructions from the integrated controller and adjusts the opening of the feed regulating valve to make the instantaneous flow of the material in the feed pipeline meet the setting requirements.

[0031] Specifically, the main temperature control loop c includes the main loop cold and hot medium inlet pipe c1, the main loop cold and hot medium outlet pipe c2, the inlet pipe thermometer TIS102, the outlet pipe thermometer TIS103, the main loop temperature control flowmeter FIQC101 and the main loop temperature control regulating valve FV101. The heat medium in the main loop cold and hot medium inlet pipe c1 and the main loop cold and hot medium outlet pipe c2 can be heat transfer oil, steam, hot water, and the cold medium can be circulating water, 7-degree water, refrigerated ethylene glycol aqueous solution, and refrigerated calcium chloride aqueous solution.

[0032] The inlet tube thermometer TIS102 and the outlet tube thermometer TIS103 send the real-time monitored temperature data back to the integrated controller. The integrated controller a calculates the current required cold and hot medium flow rate through the inlet and outlet temperature difference of the main loop cold and hot medium system, and then instructs the main loop temperature control flowmeter FIQC101 to adjust the opening of the main loop temperature control valve FV101 to provide the reaction system with the heat exchange required at the moment. The main temperature control loop provides most of the heat exchange for temperature control in the reaction process. The control data source has nothing to do with the measured temperature in the reaction system, but only with the reaction data input to the integrated controller a. Temperature control with prediction function is realized based on the input data.

[0033] Specifically, the correction temperature control loop d includes a correction loop cold and hot medium inlet pipe d1, a correction loop cold and hot medium outlet pipe d2, a reaction system thermometer TIASC101, and a correction loop temperature control valve TV101. Switch valves for switching cold and hot medium are also provided on the correction loop cold and hot medium inlet pipe d1 and the correction loop cold and hot medium outlet pipe d2.

[0034] The reaction system thermometer TIASC101 transmits the real-time monitored temperature data back to the integrated controller a, which compares the difference between the actual temperature value and the preset value, and controls the opening of the correction loop temperature control valve TV101 if necessary, and provides appropriate supplementary heat exchange to ensure the temperature stability in the reaction system. The control input data of the correction temperature control loop comes from the measured temperature in the reaction system, but only a small part of the heat exchange for temperature control of the reaction process is provided for anti-disturbance.

[0035] Specifically, the safety interlock module e includes a drop feed cut-off valve XV101, a solvent feed cut-off valve XV102, other reactant feed cut-off valve XV103, a reaction system liquid level switch LAS101, a reaction system pressure transmitter PIAS101, a refrigerant inlet bypass switch valve XV105, cold and hot medium inlet cut-off valves XV104 / XV106 and cold and hot medium outlet cut-off valves XV107 / XV108.

[0036] When the liquid level of the reaction system exceeds the upper limit of the liquid level switch, the drop feed cut-off valve XV101, the solvent feed cut-off valve XV102, and the other reactant feed cut-off valve XV103 are automatically closed to prevent material overflow; when the reaction system is over-temperature and over-pressure, the drop feed cut-off valve XV101, the heat medium inlet cut-off valve XV106 / heat medium outlet cut-off valve XV108 are automatically closed, and the refrigerant inlet bypass switch valve XV105 and the refrigerant inlet cut-off valve XV104 / refrigerant outlet cut-off valve XV107 are automatically opened to end the reaction, provide cooling, prevent system explosion, and ensure the safety of the device.

[0037] Specifically, the reaction system includes a reaction kettle f1, a solvent feed pipe f2, other reactant feed pipes f3, a product discharge pipe f4 and a gas phase pipeline f5.

[0038] The reaction system includes two completely independent public engineering medium channels. The main circuit hot and cold medium inlet pipe c1 of the main temperature control circuit c and the correction temperature control circuit d, the main circuit hot and cold medium outlet pipe c2 and the correction circuit hot and cold medium inlet pipe d1 and the correction circuit hot and cold medium outlet pipe d2 are connected to different channels respectively without interfering with each other, and jointly realize precise temperature control with prediction function.

[0039] The specific process is as follows:

[0040] Input the optimal temperature rise curve of the reaction process, the instantaneous heat exchange data required under different cumulative drop amounts in the reaction process and other basic reaction parameters into the integrated controller a. Add a certain amount of solvent to the reactor f1 through the solvent feed pipe f2, and add a certain amount of reactants to the reactor f1 through the other reactant feed pipe f3, and start the reaction after preparation.

[0041] At this time, the reactants are added to the reactor f1 through the feed control module b according to the preset feeding rate, and the main temperature control loop c adjusts the flow of cold and hot media according to the preset temperature rise curve, reaction heat and other data, so that the reaction system can obtain heat or cold as required during operation. At the same time, the correction temperature control loop d continues to work. When it is found that the temperature in the reaction system deviates from the preset temperature rise curve, the heat exchange amount is supplemented in time for correction.

[0042] After the addition of the reactants is completed, the reaction is continued by keeping the temperature or cooling the material for discharge as needed, and the reaction process is completed.

[0043] After adopting the temperature control device of this embodiment, the temperature control is based on a large amount of preliminary experimental data, and is no longer adjusted by lagging the temperature change in the reaction system, and truly realizes accurate temperature control with prediction function. At the same time, the correction loop also further enhances the anti-disturbance ability of the system, greatly improving the temperature control accuracy of the entire system. With the improvement of temperature control accuracy, the side reactions of the reaction process are reduced, the utilization rate of raw materials is improved, the safety of the process is strengthened, and the overall energy utilization rate is improved.

[0044] Specifically, the device of this embodiment is used to carry out the polymerization reaction of a new type of plastic, the optimal reaction temperature is 80°C, the heating medium is 120°C low-pressure steam, and the cooling medium is 32°C circulating water; the main temperature control loop goes through the companion pipe 1, and the correction temperature control loop goes through the companion pipe 2. The temperature control accuracy of the entire reaction process is ±0.8°C.

[0045] Specifically, the device of this embodiment is used to carry out the condensation reaction of a certain pharmaceutical intermediate, the optimal reaction temperature is 150°C, the heating medium is 230°C thermal oil, and the cooling medium is 32°C circulating water; the main temperature control circuit is jacketed, and the correction temperature control circuit is inner coil. The temperature control accuracy of the entire reaction process is ±0.5°C.

[0046] Specifically, the device of this embodiment is used to carry out the alkylation reaction of a pesticide intermediate, the optimal reaction temperature is -10°C, the heating medium is 50°C hot water, the cooling medium is -35°C frozen calcium chloride aqueous solution; the main temperature control circuit uses the companion pipe, and the correction temperature control circuit uses the inner coil. The temperature control accuracy of the entire reaction process is ±0.3°C.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A precise temperature control device for a kettle reactor with a prediction function, characterized in that: The invention comprises an integrated controller (a) for performing data interaction processing, controlling a feed rate and a temperature control loop, a feed control module (b) for receiving instructions from the integrated controller (a) to control the instantaneous flow of materials in a feed pipeline to meet setting requirements, a main temperature control loop (c) with a prediction function for providing heat exchange for temperature control of a reaction process, wherein the control data source is related to the reaction data input to the integrated controller (a), and the control input data is related to the actual temperature measured in the reaction system, and the correction temperature control loop (d) for anti-disturbance, and a safety interlock module (e) for preventing the material in the reaction system from overflowing, providing cooling capacity, and preventing the reaction system from exploding, and a reaction system; the reaction system comprises a reactor (f1).

2. The precise temperature control device for a tank reactor with a prediction function according to claim 1, characterized in that: The integrated controller (a) includes functional modules corresponding to data input storage, feed control, main temperature control, correction temperature control, safety interlock and data interaction processing.

3. The precise temperature control device for a tank reactor with a prediction function according to claim 2, characterized in that: The feed control module (b) comprises a feed pipeline (b1) for adding reactants into the reactor (f1), and a feed flow meter FIQC102 and a feed regulating valve FV102 are arranged on the feed pipeline (b1).

4. The precise temperature control device for a tank reactor with a prediction function according to claim 3, characterized in that: The main temperature control circuit (c) comprises a main circuit cold and hot medium inlet pipe (c1) and a main circuit cold and hot medium outlet pipe (c2) connected to the reaction kettle (f1); the main circuit cold and hot medium inlet pipe (c1) is provided with an inlet pipe thermometer TIS102, a main circuit temperature control flowmeter FIQC101 and a main circuit temperature control regulating valve FV101; the main circuit cold and hot medium outlet pipe (c2) is provided with an outlet pipe thermometer TIS103.

5. The precise temperature control device for a tank reactor with a prediction function according to claim 4, characterized in that: The reaction system comprises a solvent feed pipe (f2) connected to the reaction kettle (f1), other reactant feed pipes (f3), a product discharge pipe (f4) and a gas phase pipeline (f5).

6. The precise temperature control device for a tank reactor with a prediction function according to claim 5, characterized in that: The correction temperature control loop (d) comprises a correction loop cold and hot medium inlet pipe (d1) connected to the reaction kettle (f1), a correction loop cold and hot medium outlet pipe (d2), a reaction system thermometer TIASC101 arranged on the pipe mouth of the reaction kettle (f1), and a correction loop temperature control regulating valve TV101 arranged on the correction loop cold and hot medium inlet pipe (d1).

7. The precise temperature control device for a tank reactor with a prediction function according to claim 6, characterized in that: The safety interlock module (e) includes a drop feed cut-off valve XV101 arranged on the feed pipe (b1), a solvent feed cut-off valve XV102 arranged on the solvent feed pipe (f2), an other reactant feed cut-off valve XV103 arranged on the other reactant feed pipe (f3), a reaction system liquid level switch LAS101 arranged on the pipe mouth of the reactor (f1), a reaction system pressure transmitter PIAS101 arranged on the pipe mouth of the reactor (f1) or on the gas phase pipe (f5), a refrigerant inlet bypass switch valve XV105, a refrigerant inlet cut-off valve XV104 and a heat medium inlet cut-off valve XV106 arranged on the main circuit cold and hot medium inlet pipe (c1), and a refrigerant outlet cut-off valve XV107 and a heat medium outlet cut-off valve XV108 arranged on the main circuit cold and hot medium outlet pipe c2.

8. The precise temperature control device for a tank reactor with a prediction function according to claim 1, characterized in that: The reactor (f1) uses two independent public engineering medium channels.

9. The precise temperature control device for a tank reactor with a prediction function according to claim 6, characterized in that: The heat medium flowing through the main circuit cold and hot medium inlet pipe (c1) and the main circuit cold and hot medium outlet pipe (c2) is one of heat transfer oil, steam or hot water; the cold medium is one of circulating water, 7-degree water, refrigerated ethylene glycol aqueous solution or refrigerated calcium chloride aqueous solution; the correction circuit cold and hot medium inlet pipe (d1) and the correction circuit cold and hot medium outlet pipe (d2) are provided with switch valves for switching the cold and hot medium.

10. The precise temperature control device for a tank reactor with a prediction function according to claim 7, characterized in that: The temperature at the heat medium inlet is 50℃~230℃, and the temperature at the refrigerant inlet is -35℃~32℃.

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