Polyester resin production control system

Abstract

The utility model relates to the technical field of polyester resin production, especially relates to a polyester resin production control system, including the reaction kettle, the jacket of setting in the reaction kettle outer wall, set up in the stirring mechanism of reaction kettle and be connected to the temperature control mechanism of jacket, still including on -line viscometer, viscosity converter, current speed controller, temperature controller and central controller, on -line viscometer installs in the reaction kettle, and is connected with viscosity converter communication, current speed controller is connected with stirring mechanism communication, temperature controller is connected with temperature control mechanism communication, central controller is connected with viscosity converter, current speed controller and temperature controller communication respectively, the utility model provides a kind of on -line real -time automatic monitoring material viscosity and stirring current, and polyester resin production control system of automatic control production process.

Description

Technical Field

[0001] This utility model relates to the field of polyester resin production technology, and in particular to a polyester resin production control system. Background Technology

[0002] During the reaction process, as the molecular weight of polyester resin increases, the viscosity of the material increases and the acid value decreases. The two are in a balanced change process. In order to control the viscosity and acid value of the resin, it is necessary to test the viscosity and acid value of the resin to ensure the quality of the final product is stable.

[0003] Currently, existing polyester resin production equipment typically includes a reactor, a jacket, and a stirring mechanism. The viscosity control of materials during the production process mainly relies on manual sampling, followed by offline testing using a cone-plate viscometer. Finally, the reaction endpoint in the reactor is controlled based on the viscosity test results. However, the above-mentioned production equipment and viscosity control have the following defects: (1) It takes a certain amount of time from manual sampling to obtaining the measurement results, which leads to a delay in the control of the reaction endpoint in the reactor, thus affecting the final product quality; (2) Manual sampling requires open operation, which increases the fugitive emission of VOCs (volatile organic compounds) and pollutes the production environment; (3) Manual sampling tests involve sample recovery and disposal issues, which increases processing costs and material losses; (4) The sampling process of manual sampling cannot be precisely controlled, which will affect product quality; (5) Viscosity measurement relies solely on a cone-plate viscometer, making it difficult to guarantee reliability; (6) The stirring mechanism does not have an up-and-down movement function, which cannot guarantee the uniformity of materials in the reactor, thus affecting the reliability of the test results. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a polyester resin production control system that can automatically monitor material viscosity and stirring current in real time and automatically control the production process.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a polyester resin production control system, including a reactor, a jacket disposed on the outer wall of the reactor, a stirring mechanism disposed in the reactor, and a temperature control mechanism connected to the jacket; it also includes an online viscometer, a viscosity converter, a current-speed controller, a temperature controller, and a central controller. The online viscometer is installed in the reactor and is communicatively connected to the viscosity converter; the current-speed controller is communicatively connected to the stirring mechanism; the temperature controller is communicatively connected to the temperature control mechanism; and the central controller is communicatively connected to the viscosity converter, the current-speed controller, and the temperature controller.

[0006] Furthermore, the temperature control mechanism includes a circulating pump, an inlet pipe, an outlet pipe, a thermometer, and a temperature control component. The outlet end of the circulating pump is connected to the inlet of the jacket via the inlet pipe, and the inlet end of the circulating pump is connected to the outlet of the jacket via the temperature control component and the outlet pipe. The thermometer is installed on the inlet pipe and is communicatively connected to the temperature controller. The temperature control component is communicatively connected to the temperature controller.

[0007] Furthermore, the temperature control component includes an insulation pipeline, a heating pipeline, a cooling pipeline, a heater, a condenser, an insulation regulating valve, a heating regulating valve, and a cooling regulating valve. The inlet end of the circulating pump is connected to the outlet pipeline through the insulation pipeline, the heating pipeline, and the cooling pipeline, respectively. The insulation regulating valve is installed on the insulation pipeline. The heating regulating valve and the heater are installed on the heating pipeline. The cooling regulating valve and the condenser are installed on the cooling pipeline. The insulation regulating valve, the heating regulating valve, and the cooling regulating valve are all communicatively connected to the temperature controller.

[0008] Furthermore, it also includes a temperature detector, which is installed inside the reactor and communicates with the temperature controller.

[0009] Furthermore, the stirring mechanism includes a stirring shaft, stirring blades, and a stirring motor. The stirring shaft is disposed inside the reactor and its top end extends out of the reactor. The stirring blades are a plurality of blades, evenly arranged along the axial direction of the stirring shaft. The stirring motor is disposed on the reactor and is communicatively connected to a current and speed controller. The output end of the stirring motor is connected to the top end of the stirring shaft.

[0010] Furthermore, the stirring mechanism also includes a lifting plate, an electric telescopic rod, and a guide rod. The lifting plate is positioned above the reactor, and the stirring motor is installed in the middle of the lifting plate. The electric telescopic rod is installed at the top of the reactor, and its telescopic end is connected to the lifting plate. The guide rod is installed at the top of the reactor and slides through the lifting plate.

[0011] Furthermore, a spiral flow channel is provided inside the jacket, one end of which is connected to the liquid inlet of the jacket, and the other end of which is connected to the liquid outlet of the jacket.

[0012] The beneficial effects of this utility model are:

[0013] (1) This utility model monitors the viscosity of materials in real time through an online viscometer, and simultaneously monitors the stirring current of the stirring mechanism in real time through a current speed controller. The viscosity data and current data are transmitted to the central controller. The central controller automatically controls the stirring mechanism and the temperature control mechanism according to whether the viscosity data and current data reach the preset threshold at the same time. This realizes online real-time monitoring of material viscosity and stirring current, and controls the production process in real time through the monitored material viscosity and stirring current data. The control is delayed, highly reliable, and does not require offline manual sampling, reducing manual intervention and material waste, and avoiding VOC fugitive emissions that pollute the production environment.

[0014] (2) By setting up a lifting plate, an electric telescopic rod and a guide rod, this utility model realizes the up and down movement of the stirring mechanism during the stirring process, thereby realizing the full stirring of the material, ensuring uniformity, and thus improving the reliability of viscosity measurement.

[0015] (3) By setting up a spiral flow channel, this utility model enables the liquid in the jacket to fully exchange heat with the reactor, thereby achieving efficient temperature control. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of Example 1;

[0018] Figure 2 This is a schematic diagram of the stirring mechanism in Example 1;

[0019] Figure 3 This is a schematic diagram of the temperature control mechanism in Example 1;

[0020] Figure 4 This is a schematic diagram of the stirring mechanism in Example 2;

[0021] Figure 5 This is a schematic diagram of the jacket in Example 3.

[0022] In the diagram: 100, Reactor; 200, Jacket; 210, Spiral Flow Channel; 300, Stirring Mechanism; 310, Stirring Shaft; 320, Stirring Blades; 330, Stirring Motor; 340, Lifting Plate; 350, Electric Telescopic Rod; 360, Guide Rod; 400, Temperature Control Mechanism; 410, Circulating Pump; 420, Inlet Pipeline; 430, Outlet Pipeline; 440, Thermometer; 451, Insulation Pipeline; 452, Heating Pipeline; 453, Cooling Pipeline; 454, Heater; 455, Condenser; 456, Insulation Regulating Valve; 457, Heating Regulating Valve; 458, Cooling Regulating Valve; 500, Online Viscometer; 600, Viscosity Converter; 700, Current and Speed ​​Controller; 800, Temperature Controller; 900, Central Controller; 1000, Temperature Detector. Detailed Implementation

[0023] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0024] Example 1

[0025] like Figure 1 As shown, a polyester resin production control system includes a reactor 100, a jacket 200, a stirring mechanism 300, a temperature control mechanism 400, an online viscometer 500, a viscosity converter 600, a current-speed controller 700, a temperature controller 800, and a central controller 900. The jacket 200 is disposed on the outer wall of the reactor 100, the stirring mechanism 300 is disposed inside the reactor 100, and the temperature control mechanism 400 is connected to the jacket 200. The online viscometer 500 is installed inside the reactor 100 and is communicatively connected to the viscosity converter 600. The current-speed controller 700 is communicatively connected to the stirring mechanism 300, the temperature controller 800 is communicatively connected to the temperature control mechanism 400, and the central controller 900 is communicatively connected to the viscosity converter 600, the current-speed controller 700, and the temperature controller 800.

[0026] The viscosity of the material is monitored in real time by an online viscometer 500, while the stirring current of the stirring mechanism 300 is monitored synchronously in real time by a current-speed controller 700. The viscosity and current data are transmitted to a central controller 900. The central controller 900 automatically controls the stirring mechanism 300 and the temperature control mechanism 400 based on whether the viscosity and current data simultaneously reach preset thresholds. This achieves real-time online monitoring of material viscosity and stirring current, and real-time control of the production process using these two data points. The control is lag-free, highly reliable, and eliminates the need for manual sampling, reducing human intervention and material waste, and preventing fugitive VOC emissions that pollute the production environment. Furthermore, the online viscometer 500's real-time tracking of material viscosity changes effectively monitors molecular weight, allowing production personnel to detect anomalies or deviations from specifications at an early stage and ensure necessary corrective measures are taken, thereby improving product quality.

[0027] Specifically, the online viscometer 500 uses a torque-type vibration viscometer with a probe measurement accuracy of ±1% and a measurement range of 0-400 Pa·s. It has temperature and pressure compensation functions and four 4-20mA output signals, representing the temperature and pressure signals before and after compensation, respectively. The central controller 900 has preset thresholds including viscosity threshold and current threshold.

[0028] like Figure 2 As shown, the stirring mechanism 300 includes a stirring shaft 310, stirring blades 320, and a stirring motor 330. The stirring shaft 310 is disposed inside the reactor 100, and its top end extends out of the reactor 100. The stirring blades 320 consist of several blades, which are evenly arranged along the axial direction of the stirring shaft 310. The stirring motor 330 is disposed on the reactor 100 and is communicatively connected to the current and speed controller 700. The output end of the stirring motor 330 is connected to the top end of the stirring shaft 310.

[0029] During production, the current and speed controller 700 monitors the operating current (i.e., stirring current) of the stirring motor 330 in real time and can control the speed of the stirring motor 330. The viscosity of the material in the reactor 100 is related to the operating current of the stirring motor 330: when the viscosity of the material in the reactor 100 increases, the load on the stirring mechanism 300 at the end of the reaction will increase, and therefore the operating current of the stirring motor 330 will increase.

[0030] like Figure 3As shown, the temperature control mechanism 400 includes a circulating pump 410, an inlet pipe 420, an outlet pipe 430, a thermometer 440, and a temperature control component. The outlet of the circulating pump 410 is connected to the inlet of the jacket 200 via the inlet pipe 420. The inlet of the circulating pump 410 is connected to the outlet of the jacket 200 via the temperature control component and the outlet pipe 430. The thermometer 440 is installed on the inlet pipe 420 and is communicatively connected to the temperature controller 800 to monitor the liquid temperature in the inlet pipe 420 in real time. The temperature control component is communicatively connected to the temperature controller 800. Specifically, control valves are installed on the inlet pipe 420 and the outlet pipe 430, respectively.

[0031] The temperature of the reactor 100 is controlled by adjusting the temperature of the liquid flowing inside the jacket 200 using a temperature control component.

[0032] like Figure 3 As shown, the temperature control assembly includes an insulation pipe 451, a heating pipe 452, a cooling pipe 453, a heater 454, a condenser 455, an insulation regulating valve 456, a heating regulating valve 457, and a cooling regulating valve 458. The inlet of the circulating pump 410 is connected to the outlet pipe 430 through the insulation pipe 451, the heating pipe 452, and the cooling pipe 453, respectively. The insulation regulating valve 456 is installed on the insulation pipe 451, the heating regulating valve 457 and the heater 454 are installed on the heating pipe 452, and the cooling regulating valve 458 and the condenser 455 are installed on the cooling pipe 453. The insulation regulating valve 456, the heating regulating valve 457, and the cooling regulating valve 458 are all communicatively connected to the temperature controller 800.

[0033] During the production process, the temperature controller 800 controls the opening and closing of the heat preservation regulating valve 456, the heating regulating valve 457, and the cooling regulating valve 458 according to the temperature control requirements, so that the liquid entering the jacket 200 has different temperatures.

[0034] like Figure 1 As shown, the polyester resin production control system also includes a temperature detector 1000, which is installed inside the reactor 100 to monitor the material temperature in real time. The temperature detector 1000 is communicatively connected to the temperature controller 800.

[0035] The combination of temperature detector 1000 and thermometer 440 also facilitates the observation and control of the temperature regulation effect of reactor 100.

[0036] During the final reaction stage, the central controller 900 compares and calculates the material viscosity sent by the viscosity converter 600 and the stirring current sent by the current-speed controller 700 with preset thresholds. When both the material viscosity and the stirring current reach the preset thresholds, the central controller 900 outputs a control feedback signal. Upon receiving the feedback signal, the temperature controller 800 automatically adjusts and closes the heat preservation regulating valve 456 and the heating regulating valve 457, and opens the cooling regulating valve 458 to enter the reaction endpoint cooling mode. Simultaneously, upon receiving the control feedback signal, the current-speed controller 700 automatically adjusts the speed of the stirring motor 330 to enter the reaction endpoint mode, thereby achieving continuous monitoring and prediction of the reaction state and automatic control of the reaction endpoint. It should be noted that this application can also use material viscosity as the main adjustment parameter and stirring current as the secondary adjustment parameter to form a cascade control system.

[0037] To address the impact of varying operating conditions, such as different temperatures and pressures, on sampling accuracy, the central controller 900 employs an adaptive control algorithm. This algorithm adjusts sampling parameters (material viscosity and stirring current) based on real-time data. The data acquisition and analysis module within the central controller 900 utilizes statistical process control (SPC) to ensure the stability of the sampling results. Specifically, the adaptive control algorithm uses existing algorithms, and the statistical process control method is a current technology.

[0038] Example 2

[0039] This embodiment further optimizes the stirring mechanism 300 based on Embodiment 1, such as... Figure 4 As shown, the stirring mechanism 300 also includes a lifting plate 340, an electric telescopic rod 350, and a guide rod 360. The lifting plate 340 is positioned above the reactor 100, and the stirring motor 330 is installed in the middle of the lifting plate 340. The electric telescopic rod 350 is installed at the top of the reactor 100, and its telescopic end is connected to the lifting plate 340. The guide rod 360 is installed at the top of the reactor 100 and slides through the lifting plate 340 to guide the lifting of the lifting plate 340 and ensure stability.

[0040] By setting up the lifting plate 340, the electric telescopic rod 350 and the guide rod 360, the stirring mechanism 300 can move up and down during the stirring process, thereby achieving full mixing of the material, ensuring uniformity, and improving the reliability of viscosity measurement.

[0041] Specifically, the electric telescopic rod 350 can also be replaced by a cylinder; the guide rods 360 are respectively set at the four corners of the lifting plate 340; a sliding sleeve is provided at the top center of the reactor 100, and the stirring shaft 310 passes through the sliding sleeve, so that the stirring shaft 310 can move axially and rotate circumferentially, while ensuring sealing.

[0042] Example 3

[0043] This embodiment further optimizes the jacket 200 based on Embodiment 1 or Embodiment 2, such as... Figure 5 As shown, a spiral flow channel 210 is provided inside the jacket 200. One end of the spiral flow channel 210 is connected to the liquid inlet of the jacket 200, and the other end is connected to the liquid outlet of the jacket 200.

[0044] By setting the spiral flow channel 210, the liquid in the jacket 200 and the reactor 100 can fully exchange heat, thereby achieving efficient temperature control of the reactor 100.

[0045] As a further optimization, several baffles are arranged at intervals along the liquid flow direction inside the spiral channel 210. The baffles are provided with through holes, and the through holes on adjacent baffles are staggered, so as to further enable the liquid in the jacket 200 to fully exchange heat with the reactor 100.

[0046] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A polyester resin production control system, comprising a reactor (100), a jacket (200) disposed on the outer wall of the reactor (100), a stirring mechanism (300) disposed within the reactor (100), and a temperature control mechanism (400) connected to the jacket (200); characterized in that: It also includes an online viscometer (500), a viscosity converter (600), a current-speed controller (700), a temperature controller (800), and a central controller (900). The online viscometer (500) is installed inside the reactor (100) and is communicatively connected to the viscosity converter (600). The current-speed controller (700) is communicatively connected to the stirring mechanism (300). The temperature controller (800) is communicatively connected to the temperature control mechanism (400). The central controller (900) is communicatively connected to the viscosity converter (600), the current-speed controller (700), and the temperature controller (800), respectively.

2. The polyester resin production control system according to claim 1, characterized in that: The temperature control mechanism (400) includes a circulating pump (410), an inlet pipe (420), an outlet pipe (430), a thermometer (440), and a temperature control component. The outlet end of the circulating pump (410) is connected to the inlet of the jacket (200) through the inlet pipe (420). The inlet end of the circulating pump (410) is connected to the outlet of the jacket (200) in sequence through the temperature control component and the outlet pipe (430). The thermometer (440) is installed on the inlet pipe (420) and is communicatively connected to the temperature controller (800). The temperature control component is communicatively connected to the temperature controller (800).

3. The polyester resin production control system according to claim 2, characterized in that: The temperature control assembly includes an insulated pipe (451), a heating pipe (452), a cooling pipe (453), a heater (454), a condenser (455), an insulated regulating valve (456), a heating regulating valve (457), and a cooling regulating valve (458). The inlet of the circulating pump (410) is connected to the outlet pipe (430) through the insulated pipe (451), the heating pipe (452), and the cooling pipe (453), respectively. The heat preservation regulating valve (456) is installed on the heat preservation pipeline (451), the heating regulating valve (457) and the heater (454) are installed on the heating pipeline (452), and the cooling regulating valve (458) and the condenser (455) are installed on the cooling pipeline (453). The heat preservation regulating valve (456), the heating regulating valve (457) and the cooling regulating valve (458) are respectively connected to the temperature controller (800) in communication.

4. The polyester resin production control system according to claim 1, characterized in that: It also includes a temperature detector (1000), which is installed inside the reactor (100) and is communicatively connected to the temperature controller (800).

5. The polyester resin production control system according to claim 1, characterized in that: The stirring mechanism (300) includes a stirring shaft (310), stirring blades (320), and a stirring motor (330). The stirring shaft (310) is disposed inside the reactor (100), and its top end extends out of the reactor (100). The stirring blades (320) consist of several blades, which are evenly arranged along the axial direction of the stirring shaft (310). The stirring motor (330) is disposed on the reactor (100) and is communicatively connected to the current and speed controller (700). The output end of the stirring motor (330) is connected to the top end of the stirring shaft (310).

6. The polyester resin production control system according to claim 5, characterized in that: The stirring mechanism (300) further includes a lifting plate (340), an electric telescopic rod (350), and a guide rod (360). The lifting plate (340) is located above the reactor (100), and the stirring motor (330) is installed in the middle of the lifting plate (340). The electric telescopic rod (350) is installed at the top of the reactor (100), and its telescopic end is connected to the lifting plate (340). The guide rod (360) is installed at the top of the reactor (100) and slides through the lifting plate (340).

7. The polyester resin production control system according to claim 1, characterized in that: The jacket (200) is provided with a spiral flow channel (210), one end of which is connected to the liquid inlet of the jacket (200) and the other end of which is connected to the liquid outlet of the jacket (200).

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