Temperature control system for intermittent reaction kettle

Abstract

The temperature control system for the intermittent reaction kettle comprises the intermittent reaction kettle, a reaction kettle jacket, a heat exchange medium inlet header pipe and a heat exchange medium outlet header pipe, the reaction kettle jacket is arranged on the outer wall of the intermittent reaction kettle, the heat exchange medium inlet header pipe is connected with an inlet in the bottom of the reaction kettle jacket, and the heat exchange medium outlet header pipe is connected with an outlet in the bottom of the reaction kettle jacket. An inner circulating pump is arranged on the heat exchange medium inlet header pipe, the heat exchange medium outlet header pipe is connected with an outlet in the top of the reaction kettle jacket, and the heat exchange medium inlet header pipe, the inner circulating pump, the reaction kettle jacket and the heat exchange medium outlet header pipe form an outer circulating system. The temperature in the reaction kettle and the temperature in the reaction kettle jacket are respectively controlled, so that the application range of the system is wider. The heat exchange media at different temperatures are controlled by opening and closing the switch valve, the opening and closing of the switch valve can be automatically switched according to the temperature control state, and the influence of manual operation and human factors is reduced; the outer circulation and the inner circulation of the heat exchange medium are controlled by changing the opening degree of the adjusting valve, and therefore the control precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial automation process control, in particular to a temperature control system for an intermittent reaction kettle. Background Art

[0002] With the development of science and technology and economy, chemical and fermentation processes have also put forward higher requirements for the product quality of reactants and the automation of production processes. Reactors are a kind of chemical reactors commonly used in food, chemical and pharmaceutical industries. When the reactor is in intermittent reaction, the final quality of the product depends on the precise and stable control of the temperature in the reactor during the reaction process. As a key equipment in the chemical production process, intermittent reactors determine the quality of chemical products. Temperature control is the core link of the reaction process, and the temperature control effect directly affects the quality and production efficiency of the product. Intermittent reactors have the characteristics of time-varying, nonlinear and hysteresis. In actual production, the temperature in the reactor is not only affected by factors such as the external environment temperature and the type of chemical reaction, but also by the changes in the composition of the system in the reactor. During the reaction, there will be a lot of heat absorption and heat release. The temperature in the reactor fluctuates greatly, which makes temperature control difficult. Using a single classic PID control method, it is impossible to perform adaptive control according to the actual situation in actual production, and it is difficult to achieve satisfactory control effects. In addition, parameter debugging takes a lot of time, resulting in high energy consumption and high production costs, which is not conducive to product competition in the market.

[0003] Therefore, it is necessary to provide a temperature control system for intermittent reactors to overcome the problems that the existing reactor temperature control requires a lot of time for parameter debugging, which leads to high energy consumption and high production costs. A temperature control system with excellent accuracy and low energy consumption is provided by using modeling and simulation software for modeling, simulation, debugging and output, and controlling the controlled valve. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a temperature control system for an intermittent reactor, which controls the heat exchange medium of different temperatures by opening and closing a switch valve, improves the temperature control accuracy of the reactor jacket by setting an external circulation system and an internal circulation system, and performs modeling, simulation and debugging through simulation software.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A temperature control system for an intermittent reactor comprises an intermittent reactor, a reactor jacket, a heat exchange medium inlet manifold and a heat exchange medium outlet manifold, wherein the reactor jacket is arranged on the outer wall of the intermittent reactor, the heat exchange medium inlet manifold is connected to the inlet at the bottom of the reactor jacket, an internal circulation pump is arranged on the heat exchange medium inlet manifold, the heat exchange medium outlet manifold is connected to the outlet at the top of the reactor jacket, and the heat exchange medium inlet manifold, the internal circulation pump, the reactor jacket and the heat exchange medium outlet manifold form an external circulation system.

[0007] An internal circulation branch is connected between the heat exchange medium inlet main pipe and the heat exchange medium outlet main pipe, and the internal circulation branch, the internal circulation pump and the reactor jacket form an internal circulation system.

[0008] The inlet of the reactor jacket is provided with a reactor jacket thermometer, the outlet of the reactor jacket is provided with a reactor outlet thermometer, and the batch reactor is provided with an internal thermometer. The internal thermometer is used to measure the temperature data inside the batch reactor; the reactor jacket thermometer is used to measure the temperature data at the inlet of the reactor jacket; and the reactor outlet thermometer is used to measure the temperature data at the outlet of the reactor jacket.

[0009] Preferably, an electromagnetic flowmeter and a medium flow regulating valve are provided on the heat exchange medium inlet main pipe.

[0010] Preferably, an internal circulation switch valve and a check valve are provided on the internal circulation branch, which can prevent the heat exchange medium from flowing in series.

[0011] Preferably, the heat exchange medium inlet main pipe is connected in parallel with a high temperature medium inlet and a low temperature medium inlet. After the high temperature medium inlet and the low temperature medium inlet are collected in the heat exchange medium inlet main pipe, they are connected to the inlet of the reactor jacket through an internal circulation pump.

[0012] Preferably, the heat exchange medium outlet main pipe is connected in parallel with a high temperature medium reflux outlet and a low temperature medium reflux outlet. The outlet of the reactor jacket is connected to the high temperature medium reflux outlet and the low temperature medium reflux outlet respectively through the heat exchange medium outlet main pipe.

[0013] Preferably, a high-temperature heat exchange medium inlet switch valve is provided on the high-temperature medium inlet pipeline, and a low-temperature heat exchange medium inlet switch valve is provided on the low-temperature medium inlet pipeline. The high-temperature heat exchange medium inlet switch valve and the low-temperature heat exchange medium inlet switch valve are used to control the connection or cutoff of the high-temperature medium inlet and the low-temperature medium inlet respectively.

[0014] Preferably, a high-temperature heat exchange medium outlet switch valve is provided on the high-temperature medium return outlet pipeline, and a low-temperature heat exchange medium outlet switch valve is provided on the low-temperature medium return outlet pipeline. The on or off of the media at the high-temperature medium return outlet and the low-temperature medium return outlet is controlled by the high-temperature heat exchange medium outlet switch valve and the low-temperature heat exchange medium outlet switch valve respectively.

[0015] The temperature control method for the batch reactor is as follows:

[0016] Step 1: First, obtain the model structure of the controlled object through the mechanism analysis method. Then, obtain the heating and cooling data of the batch reactor through experiments. Use the system identification toolbox in the simulation software to identify the model parameters for the obtained data, and obtain the mathematical model of the specific batch reactor. Debug the heating and cooling of the obtained mathematical model in the simulation software using different control algorithm controllers. During the control process, connect the simulation software and the configuration control software through the communication protocol for data communication.

[0017] During the control process, the simulation software uses the real-time read temperature value as the input of the debugged control algorithm controller, and its output value is used as the opening value of the controlled valve regulating valve, or the PID parameter value output by it is sent to the PID encapsulation module of the configuration control software through the communication protocol for automatic control to achieve the adaptive control process.

[0018] Step 2: In the specific control method, set the expected temperature T of the batch reactor, and calculate the set value T1 (T1>T) of the temperature at the inlet of the reactor jacket through the corresponding algorithm. During the heating stage of the batch reactor, at this time, it is necessary to control the opening of the high-temperature heat exchange medium inlet switch valve and the high-temperature heat exchange medium outlet switch valve. The control algorithm controller outputs the opening value of the controlled valve. This control loop adjusts the opening of the controlled valve through the controller with the in-reactor temperature T2 (T2<T) collected in real time for the entire heating control process. At this time, the heat exchange medium is in the external circulation system. Or the control algorithm controller outputs the PID parameter value and sends it to the PID encapsulation module of the configuration control software. This control loop outputs the corresponding control parameters through the controller with the in-reactor temperature T2 (T2<T) collected in real time for the entire heating automatic control process. At this time, the heat exchange medium is in the external circulation system.

[0019] Step 3: When the temperature of the batch reactor 1 reaches T3 (T2 < T3 < T), control the cooling of the inlet temperature T4 of the reactor jacket (T4 > T1). Control the high-temperature heat exchange medium inlet switch valve and the high-temperature heat exchange medium outlet switch valve to close, control the low-temperature heat exchange medium inlet switch valve and the low-temperature heat exchange medium outlet switch valve to open, control the output upper limit of the controlled valve, and at the same time switch to the control algorithm controller 2 to output the opening value of the controlled valve. This control loop adjusts the opening of the controlled valve through the controller based on the jacket inlet temperature T3 collected in real time. At this time, the heat exchange medium is in the external circulation system. Or at the same time switch to the control algorithm controller 2 to output the PID parameter value and send it to the PID encapsulation module of the configuration control software. This control loop performs automatic control by outputting corresponding control parameters through the controller based on the jacket inlet temperature T3 collected in real time. At this time, the heat exchange medium is in the external circulation system.

[0020] Step 4: When the inlet temperature T4 of the reactor jacket drops to T1, control the low-temperature heat exchange medium inlet switch valve and the low-temperature heat exchange medium outlet switch valve to close, and control the internal circulation switch valve to open. At this time, the heat exchange medium is in the internal circulation system. When the temperature of the batch reactor reaches T, perform constant temperature control. Since the exothermic reaction causes the temperature in the batch reactor to rise, it is necessary to control the low-temperature heat exchange medium inlet switch valve and the low-temperature heat exchange medium outlet switch valve to open, and at the same time switch to the control algorithm controller 2 to output the opening value of the controlled valve. At the same time, it is necessary to control the opening upper limit of the controlled valve to control the temperature in the reactor to be T ± 0.5°C. Or at the same time switch to the control algorithm controller 2 to output the PID parameter value and send it to the PID encapsulation module of the configuration control software for automatic control. At the same time, it is necessary to control the output upper limit of the controlled valve to control the temperature in the reactor to be T ± 0.5°C.

[0021] Based on the communication between the simulation modeling software and the configuration control software, perform modeling, simulation, and debugging output, and perform precision control or adaptive control methods and corresponding control strategies on the controlled valve, overcoming the problems of large production consumption and high cost caused by the unsatisfactory control effect of a single control method and the long time spent on parameter tuning.

[0022] The beneficial effects of the present utility model are as follows:

[0023] The utility model is a temperature control system for an intermittent reactor. Due to the adoption of the above technical solution, the utility model adopts the temperature control inside the reactor and the reactor jacket respectively, and the application range of the system is wider. By adopting the opening and closing of the switch valve to control the heat exchange medium of different temperatures, the opening and closing of the switch valve can be automatically switched according to the state of temperature control, reducing the influence of human factors in manual operation; by changing the opening of the regulating valve to control the external circulation and internal circulation of the heat exchange medium, the control accuracy is improved. Modeling simulation debugging or adaptive PID control method can also be performed through simulation software, avoiding the problems of high energy consumption and high production cost caused by continuous debugging in actual production; the simulation output PID parameters are used for automatic control of the configuration software, which effectively improves the robustness of the control system.

[0024] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, and at the same time to make the above and other purposes, technical features and advantages of the utility model easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0026] Figure 1 The utility model shows a schematic structural diagram of a temperature control system for an intermittent reactor.

[0027] Figure 2 A data communication flow chart from simulation to application of a temperature control system for an intermittent reactor according to the present invention is shown.

[0028] Figure 3 A flow chart from simulation to application of a temperature control system for an intermittent reactor according to the utility model is shown.

[0029] Figure 4 The utility model shows a real-time data transmission flow chart of a control method controller for a temperature control system of an intermittent reactor.

[0030] Description of main reference numerals:

[0031] 1-intermittent reactor, 2-reactor jacket, 3-thermometer inside reactor, 4-reactor jacket thermometer, 5-reactor outlet thermometer, 6-internal circulation pump, 7-internal circulation switch valve, 8-check valve, 9-electromagnetic flowmeter, 10-medium flow regulating valve, 11-high-temperature heat exchange medium outlet switch valve, 12-low-temperature heat exchange medium outlet switch valve, 13-high-temperature heat exchange medium inlet switch valve, 14-low-temperature heat exchange medium inlet switch valve, 15-high-temperature medium reflux outlet, 16-low-temperature medium reflux outlet, 17-high-temperature medium inlet, 18-low-temperature medium inlet. DETAILED DESCRIPTION

[0032] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0033] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0034] In this document, for the convenience of description, spatial relative terms such as "below", "below", "down", "above", "above", "upper", etc. may be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to include different orientations of the object in use or operation in addition to the orientation depicted in the figure. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used in this document should be interpreted accordingly.

[0035] like Figure 1 As shown, a temperature control system for an intermittent reactor comprises an intermittent reactor 1, a reactor jacket 2, a heat exchange medium inlet manifold and a heat exchange medium outlet manifold, wherein the reactor jacket 2 is arranged on the outer wall of the intermittent reactor 1, the heat exchange medium inlet manifold is connected to the inlet at the bottom of the reactor jacket 2, an internal circulation pump 6 is arranged on the heat exchange medium inlet manifold, and the heat exchange medium outlet manifold is connected to the outlet at the top of the reactor jacket 2, and the heat exchange medium inlet manifold, the internal circulation pump 6, the reactor jacket 2 and the heat exchange medium outlet manifold form an external circulation system. An electromagnetic flowmeter 9 and a medium flow regulating valve 10 are arranged on the heat exchange medium inlet manifold.

[0036] The heat exchange medium inlet main pipe is connected in parallel with a high temperature medium inlet 17 and a low temperature medium inlet 18. After the high temperature medium inlet 17 and the low temperature medium inlet 18 are collected in the heat exchange medium inlet main pipe, they are connected to the inlet of the reactor jacket 2 through the internal circulation pump 6. A high temperature heat exchange medium inlet switch valve 13 is provided on the high temperature medium inlet 17 pipeline, and a low temperature heat exchange medium inlet switch valve 14 is provided on the low temperature medium inlet 18 pipeline. The high temperature heat exchange medium inlet switch valve 13 and the low temperature heat exchange medium inlet switch valve 14 are used to control the connection or cutoff of the medium in the high temperature medium inlet 17 and the low temperature medium inlet 18, respectively.

[0037] The heat exchange medium outlet main pipe is connected in parallel with a high temperature medium reflux outlet 15 and a low temperature medium reflux outlet 16. The outlet of the reactor jacket 2 is connected to the high temperature medium reflux outlet 15 and the low temperature medium reflux outlet 16 respectively through the heat exchange medium outlet main pipe. A high temperature heat exchange medium outlet switch valve 11 is provided on the high temperature medium reflux outlet 15 pipeline, and a low temperature heat exchange medium outlet switch valve 12 is provided on the low temperature medium reflux outlet 16 pipeline. The high temperature heat exchange medium outlet switch valve 11 and the low temperature heat exchange medium outlet switch valve 12 are used to control the connection or cutoff of the medium at the high temperature medium reflux outlet 15 and the low temperature medium reflux outlet 16 respectively.

[0038] An internal circulation branch is connected between the heat exchange medium inlet main pipe and the heat exchange medium outlet main pipe, and an internal circulation pump 6 is provided on the heat exchange medium inlet main pipe. The internal circulation branch, the internal circulation pump 6 and the reactor jacket 2 form an internal circulation system. An internal circulation switch valve 7 and a check valve 8 are provided on the internal circulation branch.

[0039] A reactor jacket thermometer 4 is provided at the inlet of the reactor jacket 2, a reactor outlet thermometer 5 is provided at the outlet of the reactor jacket 2, and an internal thermometer 3 is provided in the batch reactor 1. The internal thermometer 3 is used to measure the temperature data inside the batch reactor 1; the reactor jacket thermometer 4 is used to measure the temperature data at the inlet of the reactor jacket 2; and the reactor outlet thermometer 5 is used to measure the temperature data at the outlet of the reactor jacket 2.

[0040] like Figure 2-Figure 4 As shown, the temperature control method of the intermittent reactor 1 has the following steps:

[0041] Step 1, first obtain the model structure of the controlled object through the mechanism analysis method, then obtain the heating and cooling data of the batch reactor 1 through experiments, use the obtained data to identify the model parameters using the system identification toolbox in the simulation software, and obtain the specific mathematical model of the batch reactor 1. The obtained mathematical model is used in the simulation software to perform heating and cooling debugging using different control algorithm controllers. During the control process, the simulation software and the configuration control software are connected through the communication protocol for data communication.

[0042] During the control process, the simulation software uses the temperature value read in real time as the input of the controller with the debugged control algorithm, and its output value is used as the opening value of the controlled valve regulating valve, or the PID parameter value it outputs is sent to the PID encapsulation module of the configuration control software through the communication protocol for automatic control to achieve the adaptive control process.

[0043] Step 2: In terms of the specific control method, set the expected temperature T of the batch reactor 1, and calculate the set value T1 (T1 > T) of the inlet temperature of the reactor jacket 2 through the corresponding algorithm. During the heating stage of the batch reactor 1, at this time, it is necessary to control the opening of the high-temperature heat exchange medium inlet switch valve 13 and the high-temperature heat exchange medium outlet switch valve 11. The control algorithm controller outputs the opening value of the controlled valve. This control loop adjusts the opening of the controlled valve through the controller with the in-reactor temperature T2 (T2 < T) collected in real time for the entire heating control process. At this time, the heat exchange medium is in the external circulation system. Or the control algorithm controller outputs the PID parameter value and sends it to the PID encapsulation module of the configuration control software. This control loop outputs the corresponding control parameters through the controller with the in-reactor temperature T2 (T2 < T) collected in real time for the entire heating automatic control process. At this time, the heat exchange medium is in the external circulation system.

[0044] Step 3: When the temperature of the batch reactor 1 reaches T3 (T2 < T3 < T), perform the cooling control of the inlet temperature T4 of the reactor jacket 2 (T4 > T1). Control the high-temperature heat exchange medium inlet switch valve 13 and the high-temperature heat exchange medium outlet switch valve 11 to close, control the low-temperature heat exchange medium inlet switch valve 14 and the low-temperature heat exchange medium outlet switch valve 12 to open, control the output upper limit of the controlled valve, and at the same time switch to the control algorithm controller 2 to output the opening value of the controlled valve. This control loop adjusts the opening of the controlled valve through the controller with the jacket inlet temperature T3 collected in real time. At this time, the heat exchange medium is in the external circulation system. Or at the same time switch to the control algorithm controller 2 to output the PID parameter value and send it to the PID encapsulation module of the configuration control software. This control loop outputs the corresponding control parameters through the controller with the jacket inlet temperature T3 collected in real time for automatic control. At this time, the heat exchange medium is in the external circulation system.

[0045] Step 4, when the inlet temperature T4 of the reactor jacket 2 drops to T1, the low-temperature heat exchange medium inlet switch valve 14 and the low-temperature heat exchange medium outlet switch valve 12 are controlled to be closed, and the internal circulation switch valve 7 is controlled to be opened, and the heat exchange medium is in the internal circulation system. When the temperature of the intermittent reactor 1 reaches T, constant temperature control is performed. The exothermic reaction causes the temperature in the intermittent reactor 1 to rise, and it is necessary to control the low-temperature heat exchange medium inlet switch valve 14 and the low-temperature heat exchange medium outlet switch valve 12 to be opened, and at the same time switch to the control algorithm controller 2 to output the controlled valve opening value, and at the same time, it is necessary to control the opening upper limit of the controlled valve, and control the temperature in the reactor to T±0.5℃. Or switch to the control algorithm controller 2 to output the PID parameter value and send it to the PID encapsulation module of the configuration control software for self-control, and at the same time, it is necessary to control the output upper limit of the controlled valve, and control the temperature in the reactor to T±0.5℃.

[0046] Based on the communication between the simulation modeling software and the configuration control software, modeling simulation debugging output is carried out, and the controlled valve is precision controlled, or adaptive control methods and corresponding control strategies are used, which overcomes the problems of high production consumption and high costs caused by the unsatisfactory control effect of a single control method and the long time spent on parameter setting.

[0047] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments should fall within the scope of protection of the utility model.

Claims

1. A temperature control system for an intermittent reactor, characterized in that: The invention comprises an intermittent reactor (1), a reactor jacket (2), a heat exchange medium inlet main pipe and a heat exchange medium outlet main pipe, wherein the reactor jacket (2) is arranged on the outer wall of the intermittent reactor (1), the heat exchange medium inlet main pipe is connected to the inlet at the bottom of the reactor jacket (2), an internal circulation pump (6) is arranged on the heat exchange medium inlet main pipe, and the heat exchange medium outlet main pipe is connected to the outlet at the top of the reactor jacket (2), and the heat exchange medium inlet main pipe, the internal circulation pump (6), the reactor jacket (2) and the heat exchange medium outlet main pipe form an external circulation system; The heat exchange medium inlet main pipe is provided with an electromagnetic flowmeter (9) and a medium flow regulating valve (10); the heat exchange medium inlet main pipe is connected in parallel with a high-temperature medium inlet (17) and a low-temperature medium inlet (18); the heat exchange medium outlet main pipe is connected in parallel with a high-temperature medium return outlet (15) and a low-temperature medium return outlet (16); An internal circulation branch is connected between the heat exchange medium inlet main pipe and the heat exchange medium outlet main pipe, the internal circulation branch, the internal circulation pump (6) and the reactor jacket (2) form an internal circulation system, and the internal circulation branch is provided with an internal circulation switch valve (7) and a check valve (8); A reactor jacket thermometer (4) is provided at the inlet of the reactor jacket (2), a reactor outlet thermometer (5) is provided at the outlet of the reactor jacket (2), and an in-reactor thermometer (3) is provided in the intermittent reactor (1).

2. A temperature control system for an intermittent reactor according to claim 1, characterized in that: A high-temperature heat exchange medium inlet switch valve (13) is provided on the high-temperature medium inlet (17) pipeline, and a low-temperature heat exchange medium inlet switch valve (14) is provided on the low-temperature medium inlet (18) pipeline.

3. A temperature control system for a batch reactor according to claim 1, characterized in that: A high-temperature heat exchange medium outlet switch valve (11) is provided on the high-temperature medium return outlet (15) pipeline, and a low-temperature heat exchange medium outlet switch valve (12) is provided on the low-temperature medium return outlet (16) pipeline.

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