CN117590882A - Temperature grading control method and device of polymerization kettle and electronic equipment - Google Patents
Temperature grading control method and device of polymerization kettle and electronic equipment Download PDFInfo
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- 238000006116 polymerization reaction Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000006243 chemical reaction Methods 0.000 claims abstract description 84
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- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The embodiment of the specification discloses a temperature grading control method and device of a polymerization kettle and electronic equipment. After receiving a temperature control instruction, determining a current reaction object, and inquiring temperature control information of the current reaction object; generating first control information based on the initial cascade control parameters, and sending the first control information to a target controller group; when the current kettle temperature reaches the first target temperature, generating second control information based on the first cascade control parameters, and sending the second control information to the target controller group. According to the embodiment of the specification, more accurate control of temperature is realized through sectional temperature control, so that the heat source/cold source valve is opened or closed according to actual temperature requirements, the influence of temperature lag and overshoot compensation on the reaction process is avoided, and the quality of a final product is ensured.
Description
Technical Field
One or more embodiments of the present disclosure relate to temperature control technology, and in particular, to a method and an apparatus for controlling temperature of a polymerization kettle in a graded manner, and an electronic device.
Background
Batch polymerization is a one-shot process, i.e., all components are fed into a polymerization reactor all at once, and polymerization is completed under specified conditions until the materials are discharged and packaged. The batch polymerization has wider particle size distribution than the emulsion obtained by other emulsion polymerization methods, low production efficiency and unstable product quality, but is easy to operate and control, thus being widely applied to the emulsion polymerization of monomers such as synthetic rubber, vinyl chloride and the like.
At present, the existing batch polymerization kettle temperature control mode mainly comprises the following steps: the reaction system is preheated by fully opening the heat source through a sequential control program, after the temperature of the reaction kettle reaches a certain condition, the heat source is closed, and then cascade control is carried out on the kettle temperature and the water temperature of a jacket sleeved outside the reaction kettle so as to stabilize the polymerization temperature; in the cooling process, the reaction kettle is quickly cooled by fully-opened cold source feeding, after a certain condition is met, the cold source is closed, and then cascade control is carried out on the kettle temperature and the jacket water temperature so as to be stable at a lower temperature. The control mode cannot accurately control the temperature rising and falling process, so that the temperature overshoot is easily caused by the characteristic of hysteresis property of kettle temperature change and the temperature generated by the reaction, the molecular weight distribution of the polymer is influenced, and the product performance is finally influenced.
Disclosure of Invention
In order to solve the above problems, one or more embodiments of the present disclosure describe a temperature grading control method and apparatus for a polymerization kettle, and an electronic device.
According to a first aspect, there is provided a temperature hierarchical control method of a polymerizer, the method comprising:
after receiving a temperature control instruction, responding to the temperature control instruction, determining a current reaction object, and inquiring temperature control information of the current reaction object, wherein the temperature control information comprises an initial cascade control parameter and a first cascade control parameter corresponding to a first target temperature;
generating first control information based on the initial cascade control parameters, and sending the first control information to a target controller group, wherein the first control information is used for indicating the target controller group to control a heat source valve to gradually increase the valve opening, the heating slope of a polymerization kettle is maintained at a first slope, and the target controller group comprises a first target controller corresponding to the polymerization kettle and a second target controller corresponding to a jacket arranged outside the polymerization kettle;
when the current kettle temperature reaches the first target temperature, generating second control information based on the first cascade control parameter, and sending the second control information to the target controller group, wherein the second control information is used for indicating the target controller group to control the heat source valve to gradually reduce the valve opening, the heating slope is maintained at a second slope, and the second slope is smaller than the first slope.
Preferably, the temperature control information further includes a second cascade control parameter corresponding to a second target temperature, where the second target temperature is greater than the first target temperature;
the method further comprises the steps of:
when the current kettle temperature reaches the second target temperature, acquiring the lag time of the polymerization kettle, generating third control information based on the second cascade control parameter, and sending the third control information to the target controller group, wherein the third control information is used for indicating the target controller group to control a cold source valve to increase the valve opening, and maintaining the heating slope to be zero in the lag time.
Preferably, the second target temperature is set based on the target reaction temperature of the current reaction object and the historical average overshoot temperature of the polymerizer.
Preferably, the temperature control information further includes a third cascade control parameter corresponding to the second target temperature;
after the third control information is sent to the target controller group, the method further includes:
and after the hysteresis time length, generating fourth control information based on the third cascade control parameter, and sending the fourth control information to the target controller group, wherein the fourth control information is used for indicating the target controller group to control the cold source valve to close a valve and increasing the current kettle temperature to the target reaction temperature.
Preferably, the temperature control information further includes a fourth cascade control parameter corresponding to the target reaction temperature;
the method further comprises the steps of:
when the current kettle temperature reaches the target reaction temperature, generating fifth control information based on the fourth cascade control parameter, and sending the fifth control information to the target controller group, wherein the fifth control information is used for indicating the target controller group to control the opening of the cold source valve and the closing of the heat source valve, and after a first preset reaction time period, controlling the cold source valve to gradually reduce the valve opening and controlling the heat source valve to gradually increase the valve opening, so that the current kettle temperature is maintained at the target reaction temperature.
Preferably, the temperature control information further includes a fifth cascade control parameter;
after the fifth control information is sent to the target controller group, the method further includes:
after a second preset reaction time length, generating sixth control information based on the fifth cascade control parameter, and sending the sixth control information to the target controller group, wherein the sixth control information is used for indicating the target controller group to close the heat source valve and controlling the cold source valve to gradually increase the valve opening, so that the cooling slope of the polymerization kettle is maintained at a third slope, and the absolute value of the third slope is larger than that of the first slope.
Preferably, the temperature control information further includes a sixth cascade control parameter corresponding to a third target temperature;
after the sixth control information is sent to the target controller group, the method further includes:
when the current kettle temperature reaches the third target temperature, generating seventh control information based on the sixth cascade control parameter, and sending the seventh control information to the target controller group, wherein the seventh control information is used for indicating the target controller group to control the cold source valve to gradually reduce the valve opening, the cooling slope is maintained at a fourth slope until the current kettle temperature reaches the fourth target temperature, and the absolute value of the fourth slope is smaller than the absolute value of the second slope.
According to a second aspect, there is provided a temperature gradation control apparatus of a polymerizer, the apparatus comprising:
the device comprises a receiving module, a control module and a control module, wherein the receiving module is used for responding to a temperature control instruction after receiving the temperature control instruction, determining a current reaction object, and inquiring temperature control information of the current reaction object, wherein the temperature control information comprises an initial cascade control parameter and a first cascade control parameter corresponding to a first target temperature;
The first control module is used for generating first control information based on the initial cascade control parameters, sending the first control information to a target controller group, wherein the first control information is used for indicating the target controller group to control a heat source valve to gradually increase the valve opening degree and maintaining the heating slope of the polymerization kettle at a first slope;
and the second control module is used for generating second control information based on the first cascade control parameter when the current kettle temperature reaches the first target temperature, sending the second control information to the target controller group, wherein the second control information is used for indicating the target controller group to control the heat source valve to gradually reduce the valve opening degree, and maintaining the heating slope at a second slope which is smaller than the first slope.
According to a third aspect, there is provided an electronic device comprising a processor and a memory;
the processor is connected with the memory;
the memory is used for storing executable program codes;
the processor runs a program corresponding to executable program code stored in the memory by reading the executable program code for performing the steps of the method as provided in the first aspect or any one of the possible implementations of the first aspect.
According to a fourth aspect, there is provided a computer readable storage medium having stored thereon a computer program having instructions stored therein which, when run on a computer or processor, cause the computer or processor to perform a method as provided by any one of the possible implementations of the first aspect or the first aspect.
According to the method and the device provided by the embodiment of the specification, the hysteresis characteristic of kettle temperature change and the heat generated by reaction are considered, a plurality of different temperature control stages are set, different PID parameters are set for the different stages, and the temperature is controlled more accurately through sectional temperature control, so that the heat source/cold source valve is opened or closed according to the actual temperature requirement, the influence of temperature hysteresis and overshoot compensation on the reaction process is avoided, and the quality of a final product is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a temperature grading control method in a polymerization kettle according to one embodiment of the present disclosure.
FIG. 2 is a schematic view showing the structure of a temperature gradation control apparatus in a polymerizer according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
In the following description, the terms "first," "second," and "first," are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The following description provides various embodiments of the present application, and various embodiments may be substituted or combined, so that the present application is also intended to encompass all possible combinations of the same and/or different embodiments described. Thus, if one embodiment includes feature A, B, C and another embodiment includes feature B, D, then the present application should also be considered to include embodiments that include one or more of all other possible combinations including A, B, C, D, although such an embodiment may not be explicitly recited in the following.
The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements described without departing from the scope of the application. Various examples may omit, replace, or add various procedures or components as appropriate. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.
Referring to fig. 1, fig. 1 is a schematic flow chart of a temperature grading control method of a polymerization kettle according to an embodiment of the present application. In an embodiment of the present application, the method includes:
s101, after a temperature control instruction is received, responding to the temperature control instruction, determining a current reaction object, and inquiring temperature control information of the current reaction object.
The temperature control information comprises an initial cascade control parameter and a first cascade control parameter corresponding to a first target temperature.
The execution subject of the present application may be a cloud server.
In the embodiment of the specification, when the feeding is completed in the polymerizer according to the operation procedure, and the stirrer continuously stirs to uniformly mix the materials, the cloud server will receive the temperature control instruction. The cloud server responds to the temperature control instruction, and determines a current reaction object to be reacted in the polymerization kettle according to additional information in the temperature control instruction or according to a production arrangement table of the polymerization kettle. Then, the cloud server queries the current reaction object in a preset database to determine temperature control information corresponding to the current reaction object. The temperature control instruction can be generated by corresponding staff through terminal operation, or can be generated automatically by a controller corresponding to the polymerization kettle after detecting the stirring end instruction of the stirrer.
Different reaction objects, the temperature required by the reaction, the temperature generated by the reaction, the reaction time length and the like are different, so that different temperature control information is required to be set. The staff will carry out polymerization process for several times for different reaction objects in advance to detect and record different temperature change nodes of the polymerization kettle, set different temperature control information for different reaction objects by combining temperature hysteresis change condition of the polymerization kettle and manual experience, construct mapping relation of the two, and store the mapping relation in a database. The specific numerical value of the cascade control parameter in the temperature control information can be set by taking the ratio of the actual jacket water temperature to the polymerization kettle temperature as an influence factor according to the gain calculated by the test data and combining with the manual experience.
In addition, the jacket is sleeved outside the polymerization kettle, cold sources such as chilled water and cold air can be introduced into the jacket, heat sources such as hot water and steam can also be introduced into the jacket, the polymerization kettle and the jacket are respectively and correspondingly provided with a target controller, and the target controllers can monitor the temperature of the jacket and the polymerization kettle so as to control and adjust the size of a heat source valve and/or a cold source valve, so that cascade control of heat source/cold source feeding, jacket temperature and polymerization kettle temperature is realized, and the temperature control is more accurate. The target controller may be a PID controller, and the cascade control parameters may be parameters of three control items corresponding to the PID controller, including Proportional (pro), integral (Integral) and Derivative (Derivative), where after the PID controller sets the corresponding control item parameters, the PID controller may adaptively adjust the specific opening and closing size and opening and closing rate of the heat source/cold source valve according to the current error, the accumulation of the error and the change rate of the error, so as to regulate and control the temperature.
S102, generating first control information based on the initial cascade control parameters, and sending the first control information to a target controller group.
The first control information is used for indicating the target controller group to control the heat source valve to gradually increase the opening of the valve, the heating slope of the polymerization kettle is maintained at a first slope, and the target controller group comprises a first target controller corresponding to the polymerization kettle and a second target controller corresponding to a jacket arranged outside the polymerization kettle.
In the embodiment of the present disclosure, a plurality of temperature control stages are divided according to the test data of each reaction object and the characteristics thereof, and obviously, in order to perform different temperature control on different stages, the cascade control parameters preset for different stages are also different. At the beginning of sectional control, the cloud server regulates and controls the target controller group according to the initial cascade control parameters, in this stage, the target controller group gradually increases the opening of the valve to control the heat source valve under the setting of the initial cascade control parameters so as to perform cascade temperature rise on the polymerization kettle, and meanwhile, the PID controller dynamically regulates and controls the real-time opening rate of the heat source valve based on the initial cascade control parameters so as to maintain the temperature rising slope of the polymerization kettle at a first slope. Because the kettle temperature of the polymerization kettle has the characteristic of larger hysteresis change, the temperature rising process of the kettle temperature has the trend of being slow at first and fast at second, so in the initial heating stage, the cloud server increases the opening of the valve by the control target sensor group to quickly heat the polymerization kettle at first, and the temperature rising slope at the stage can be set larger.
And S103, when the current kettle temperature reaches the first target temperature, generating second control information based on the first cascade control parameter, and sending the second control information to the target controller group.
The second control information is used for indicating the target controller group to control the heat source valve to gradually reduce the valve opening, the heating slope is maintained at a second slope, and the second slope is smaller than the first slope.
In the present embodiment, the first target temperature has not reached a temperature required for the current reaction object in the polymerization vessel to perform a sufficient reaction, but at this temperature, the polymerization in the vessel has started while releasing the heat of polymerization. Meanwhile, under the characteristic of temperature hysteresis change of the polymerization kettle, the temperature change of the polymerization kettle becomes fast. Therefore, after the current kettle temperature of the polymerization kettle reaches the first target temperature, the temperature of the next stage should be controlled, so that the temperature of the polymerization kettle does not rise as fast, but gradually rises at a relatively gentle rate, so as to slow down the temperature influence of hysteresis and polymerization heat on the kettle temperature and avoid temperature overshoot caused by too fast temperature change. Specifically, as the hysteresis change of the temperature and the polymerization heat generated by the reaction are started, the cloud server adjusts the parameters of the target controller group into the first cascade control parameters through the second control information, the target controller group can control the heat source valve to gradually reduce the valve opening so as to balance the hysteresis change and the temperature influence caused by the polymerization heat, and meanwhile, the rate of reducing the opening of the valve is adjusted in real time through the adaptive dynamic adjustment process of cascade control, so that the heating slope of the polymerization kettle is maintained at the second slope. To avoid temperature overshoot, the second slope should be smaller than the first slope, and be set relatively small so that the kettle temperature rises relatively gently to the standard temperature required for the reaction. Through such sectional control mode, can agree with the reaction characteristics and cauldron temperature change characteristic of current reaction object more, to the regulation and control of temperature more accurate, and the temperature is difficult to overshoot, even overshoot also can not overshoot too much temperature.
In one embodiment, the temperature control information further includes a second cascade control parameter corresponding to a second target temperature, the second target temperature being greater than the first target temperature;
the method further comprises the steps of:
when the current kettle temperature reaches the second target temperature, acquiring the lag time of the polymerization kettle, generating third control information based on the second cascade control parameter, and sending the third control information to the target controller group, wherein the third control information is used for indicating the target controller group to control a cold source valve to increase the valve opening, and maintaining the heating slope to be zero in the lag time.
In the embodiment of the specification, once the temperature reaches the temperature required by the reaction, the temperature overshoot is caused by the hysteresis characteristic of the kettle temperature, based on the premise, the kettle temperature can be kept at a second target temperature which is one to two degrees celsius lower than the target value required by the reaction for a period of time, and after the kettle temperature rises to the highest point and returns, the temperature is slowly increased by one to two degrees celsius to reach the target reaction temperature, so that the excessive temperature overshoot can be better avoided, and the temperature drop amplitude can be counteracted, thereby reducing the temperature fluctuation range. Specifically, the cloud server sets parameters of the target controller group through the second cascade control parameters, so that the target controller group can control the cold source valve to increase the valve opening, balance the hysteresis heat and the reaction heat, and dynamically maintain the temperature rising slope of the current kettle temperature to be zero. The specific value of the second target temperature can be selected and set through the temperature overshoot measured in the test stage, or can be set according to a fixed temperature difference value with the target reaction temperature, and the like. The hysteresis time length can be selected and set according to the hysteresis time length of the kettle temperature change measured in the test stage, or can be set according to the model of the polymerization kettle and the like.
In one embodiment, the second target temperature is set based on a target reaction temperature of the current reaction object and a historical average overshoot temperature of the polymerization kettle.
In this embodiment of the present disclosure, the cloud server determines a target reaction temperature required for the current reaction object to perform a sufficient reaction, determines a historical average overshoot temperature of the polymerization kettle from the historical test data of the test stage, and subtracts the historical average overshoot temperature from the target reaction temperature to obtain a temperature that may be the second target temperature.
In one embodiment, the temperature control information further includes a third cascade control parameter corresponding to the second target temperature;
after the third control information is sent to the target controller group, the method further includes:
and after the hysteresis time length, generating fourth control information based on the third cascade control parameter, and sending the fourth control information to the target controller group, wherein the fourth control information is used for indicating the target controller group to control the cold source valve to close a valve and increasing the current kettle temperature to the target reaction temperature.
In this embodiment of the present disclosure, after the current tank temperature maintains the lag time at the second target temperature, the cloud server considers that the temperature influence caused by the lag has been eliminated, and at this time, fourth control information is generated according to the third cascade control parameter, so as to set and control the parameter of the target controller group. The target controller group will control the cold source valve to close the valve so that the heat of polymerization and the heat brought by the heat source valve which is not completely closed act on the polymerization kettle, and slowly raise the current kettle temperature to the target reaction temperature. In the process, the target controller group can also control the heating slope of the polymerization kettle in a dynamic regulation mode, if the heating slope needs to be maintained, the heating slope at the moment should be smaller than the second slope so as to ensure that the current kettle temperature can slowly rise to the target reaction temperature, and the temperature overshoot can not be caused by the overhigh heating rate.
In one embodiment, the temperature control information further includes a fourth cascade control parameter corresponding to the target reaction temperature;
the method further comprises the steps of:
when the current kettle temperature reaches the target reaction temperature, generating fifth control information based on the fourth cascade control parameter, and sending the fifth control information to the target controller group, wherein the fifth control information is used for indicating the target controller group to control the opening of the cold source valve and the closing of the heat source valve, and after a first preset reaction time period, controlling the cold source valve to gradually reduce the valve opening and controlling the heat source valve to gradually increase the valve opening, so that the current kettle temperature is maintained at the target reaction temperature.
In the present embodiment, after the current pot temperature reaches the target reaction temperature, the current pot temperature should be maintained at that temperature for a long period of time so that the polymerization reaction is sufficiently performed in the pot. The cloud server adjusts the parameters of the target controller group into fourth cascade control parameters through the fifth control information, so that the target controller group opens a cold source valve and closes a heat source valve to balance the polymerization heat generated by the reaction, and the current kettle temperature is dynamically maintained at the target reaction temperature through cascade control. Depending on the type and number of reactants in the polymerizer, this process may last for tens of hours. In the later stage of the reaction, polymerization heat generation is reduced, so that a worker can set a first preset reaction time according to the test data, and the fifth control information also indicates the target controller group to control the cold source valve to be gradually reduced and the heat source valve to be gradually increased after the first preset reaction time so as to maintain the current kettle temperature at the target reaction temperature.
In one embodiment, the temperature control information further includes a fifth cascade control parameter;
after the fifth control information is sent to the target controller group, the method further includes:
after a second preset reaction time length, generating sixth control information based on the fifth cascade control parameter, and sending the sixth control information to the target controller group, wherein the sixth control information is used for indicating the target controller group to close the heat source valve and controlling the cold source valve to gradually increase the valve opening, so that the cooling slope of the polymerization kettle is maintained at a third slope, and the absolute value of the third slope is larger than that of the first slope.
In this embodiment of the present disclosure, the worker may set a second preset reaction duration according to the test data, where the second preset reaction duration may be regarded as a duration required for the polymerization reactor to complete the reaction after the first preset reaction duration. After the second preset reaction time length is elapsed, the cloud server considers that the reaction process of the polymerization kettle is finished, and the polymerization kettle needs to be cooled. The temperature reduction control process of the polymerization kettle is similar to the temperature rise control process of the polymerization kettle, but because the polymerization material has certain viscosity, the temperature hysteresis of the polymerization kettle is larger in the temperature reduction process, so the target controller group gradually increases the valve opening degree in the control of the cold source valve, the absolute value of the third slope maintained by the temperature reduction slope is larger than the absolute value of the first slope in the temperature reduction process of the polymerization kettle, and the temperature of the polymerization kettle can be quickly reduced under the condition of larger hysteresis.
In one embodiment, the temperature control information further includes a sixth cascade control parameter corresponding to a third target temperature;
after the sixth control information is sent to the target controller group, the method further includes:
when the current kettle temperature reaches the third target temperature, generating seventh control information based on the sixth cascade control parameter, and sending the seventh control information to the target controller group, wherein the seventh control information is used for indicating the target controller group to control the cold source valve to gradually reduce the valve opening, the cooling slope is maintained at a fourth slope until the current kettle temperature reaches the fourth target temperature, and the absolute value of the fourth slope is smaller than the absolute value of the second slope.
In the embodiment of the present disclosure, the same as the sectional heating process, the cloud server is also provided with a third target temperature according to the test data in advance. After the current kettle temperature reaches the third target temperature, the current kettle temperature is considered to be reduced to a certain extent, and the final temperature difference from the expected temperature is not set, at this time, in order to eliminate the influence caused by hysteresis, the cloud server controls the target controller group through seventh control information so as to perform the next sectional temperature control process. Because the temperature hysteresis of the polymerization kettle is larger in the cooling process, the influence caused by the change of the temperature hysteresis of the kettle is larger in the control process of the stage, therefore, the target controller group can control the cold source valve to reduce the valve opening and dynamically control the cooling slope, so that the absolute value of the fourth slope can be smaller than the absolute value of the second slope when the cooling slope is dynamically maintained at the fourth slope, and the kettle temperature can be stably and smoothly reduced to the expected temperature, namely the fourth target temperature.
The temperature grading control device of the polymerizer according to the embodiment of the present application will be described in detail with reference to fig. 2. It should be noted that, the temperature grading control device of the polymerizer shown in fig. 2 is used for executing the method of the embodiment shown in fig. 1 of the present application, and for convenience of explanation, only the portion relevant to the embodiment of the present application is shown, and specific technical details are not disclosed, please refer to the embodiment shown in fig. 1 of the present application.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a temperature grading control device of a polymerization kettle according to an embodiment of the present application. As shown in fig. 2, the apparatus includes:
the receiving module 201 is configured to determine a current reaction object in response to a temperature control instruction after receiving the temperature control instruction, and query temperature control information of the current reaction object, where the temperature control information includes an initial cascade control parameter and a first cascade control parameter corresponding to a first target temperature;
a first control module 202, configured to generate first control information based on the initial cascade control parameter, and send the first control information to a target controller group, where the first control information is used to instruct the target controller group to control a heat source valve to gradually increase a valve opening, and maintain a heating slope of a polymerization kettle at a first slope;
And the second control module 203 is configured to generate second control information based on the first cascade control parameter when the current kettle temperature reaches the first target temperature, and send the second control information to the target controller group, where the second control information is used to instruct the target controller group to control the heat source valve to gradually reduce the valve opening, and maintain the heating slope at a second slope, and the second slope is smaller than the first slope.
In one embodiment, the temperature control information further includes a second cascade control parameter corresponding to a second target temperature, the second target temperature being greater than the first target temperature;
the apparatus further comprises:
and the third control module is used for obtaining the lag time of the polymerization kettle when the current kettle temperature reaches the second target temperature, generating third control information based on the second cascade control parameter, sending the third control information to the target controller group, wherein the third control information is used for indicating the target controller group to control a cold source valve to increase the valve opening, and maintaining the heating slope to be zero in the lag time.
In one embodiment, the second target temperature is set based on a target reaction temperature of the current reaction object and a historical average overshoot temperature of the polymerization kettle.
In one embodiment, the temperature control information further includes a third cascade control parameter corresponding to the second target temperature;
the apparatus further comprises:
and the fourth control module is used for generating fourth control information based on the third cascade control parameter after the hysteresis time length, sending the fourth control information to the target controller group, wherein the fourth control information is used for indicating the target controller group to control the cold source valve to close the valve and increasing the current kettle temperature to the target reaction temperature.
In one embodiment, the temperature control information further includes a fourth cascade control parameter corresponding to the target reaction temperature;
the apparatus further comprises:
and the fifth control module is used for generating fifth control information based on the fourth cascade control parameter when the current kettle temperature reaches the target reaction temperature, sending the fifth control information to the target controller group, wherein the fifth control information is used for indicating the target controller group to control the opening of the cold source valve and the closing of the heat source valve, and controlling the cold source valve to gradually reduce the valve opening and the heat source valve to gradually increase the valve opening after a first preset reaction time length so as to maintain the current kettle temperature at the target reaction temperature.
In one embodiment, the temperature control information further includes a fifth cascade control parameter;
the apparatus further comprises:
and the sixth control module is used for generating sixth control information based on the fifth cascade control parameter after the second preset reaction time length, sending the sixth control information to the target controller group, wherein the sixth control information is used for indicating the target controller group to close the heat source valve and controlling the cold source valve to gradually increase the valve opening degree, the cooling slope of the polymerization kettle is maintained at a third slope, and the absolute value of the third slope is larger than that of the first slope.
In one embodiment, the temperature control information further includes a sixth cascade control parameter corresponding to a third target temperature;
the apparatus further comprises:
and a seventh control module, configured to generate seventh control information based on the sixth cascade control parameter when the current kettle temperature reaches the third target temperature, and send the seventh control information to the target controller group, where the seventh control information is used to instruct the target controller group to control the cold source valve to gradually reduce the valve opening, and maintain the cooling slope at a fourth slope until the current kettle temperature reaches the fourth target temperature, where an absolute value of the fourth slope is smaller than an absolute value of the second slope.
It will be apparent to those skilled in the art that the embodiments of the present application may be implemented in software and/or hardware. "Unit" and "module" in this specification refer to software and/or hardware capable of performing a specific function, either alone or in combination with other components, such as Field programmable gate arrays (Field-Programmable Gate Array, FPGAs), integrated circuits (Integrated Circuit, ICs), etc.
The processing units and/or modules of the embodiments of the present application may be implemented by an analog circuit that implements the functions described in the embodiments of the present application, or may be implemented by software that executes the functions described in the embodiments of the present application.
Referring to fig. 3, a schematic structural diagram of an electronic device according to an embodiment of the present application is shown, where the electronic device may be used to implement the method in the embodiment shown in fig. 1. As shown in fig. 3, the electronic device 300 may include: at least one central processor 301, at least one network interface 304, a user interface 303, a memory 305, at least one communication bus 302.
Wherein the communication bus 302 is used to enable connected communication between these components.
The user interface 303 may include a Display screen (Display), a Camera (Camera), and the optional user interface 303 may further include a standard wired interface, and a wireless interface.
The network interface 304 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface), among others.
Wherein the central processor 301 may comprise one or more processing cores. The central processor 301 connects the various parts within the overall electronic device 300 using various interfaces and lines, performs various functions of the terminal 300 and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 305, and invoking data stored in the memory 305. Alternatively, the central processor 301 may be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (Programmable Logic Array, PLA). The central processor 301 may integrate one or a combination of several of a central processor (Central Processing Unit, CPU), an image central processor (Graphics Processing Unit, GPU), and a modem, etc. The CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing the content required to be displayed by the display screen; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the cpu 301 and may be implemented by a single chip.
The memory 305 may include a random access memory (Random Access Memory, RAM) or a Read-only memory (Read-only memory). Optionally, the memory 305 includes a non-transitory computer readable medium (non-transitory computer-readable storage medium). Memory 305 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 305 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the above-described respective method embodiments, etc.; the storage data area may store data or the like referred to in the above respective method embodiments. The memory 305 may also optionally be at least one storage device located remotely from the aforementioned central processor 301. As shown in fig. 3, an operating system, a network communication module, a user interface module, and program instructions may be included in the memory 305, which is a type of computer storage medium.
In the electronic device 300 shown in fig. 3, the user interface 303 is mainly used for providing an input interface for a user, and acquiring data input by the user; and the central processor 301 may be used to invoke the temperature hierarchical control application of the polymerizer stored in the memory 305, and specifically perform the following operations:
After receiving a temperature control instruction, responding to the temperature control instruction, determining a current reaction object, and inquiring temperature control information of the current reaction object, wherein the temperature control information comprises an initial cascade control parameter and a first cascade control parameter corresponding to a first target temperature;
generating first control information based on the initial cascade control parameters, and sending the first control information to a target controller group, wherein the first control information is used for indicating the target controller group to control a heat source valve to gradually increase the valve opening, the heating slope of a polymerization kettle is maintained at a first slope, and the target controller group comprises a first target controller corresponding to the polymerization kettle and a second target controller corresponding to a jacket arranged outside the polymerization kettle;
when the current kettle temperature reaches the first target temperature, generating second control information based on the first cascade control parameter, and sending the second control information to the target controller group, wherein the second control information is used for indicating the target controller group to control the heat source valve to gradually reduce the valve opening, the heating slope is maintained at a second slope, and the second slope is smaller than the first slope.
The present application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above method. The computer readable storage medium may include, among other things, any type of disk including floppy disks, optical disks, DVDs, CD-ROMs, micro-drives, and magneto-optical disks, ROM, RAM, EPROM, EEPROM, DRAM, VRAM, flash memory devices, magnetic or optical cards, nanosystems (including molecular memory ICs), or any type of media or device suitable for storing instructions and/or data.
It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, such as the division of the units, merely a logical function division, and there may be additional manners of dividing the actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some service interface, device or unit indirect coupling or communication connection, electrical or otherwise.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a memory, including several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. And the aforementioned memory includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be performed by hardware associated with a program that is stored in a computer readable memory, which may include: flash disk, read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), magnetic or optical disk, and the like.
The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.
Claims (10)
1. A method for controlling the temperature of a polymerization kettle in a grading manner, which is characterized by comprising the following steps:
after receiving a temperature control instruction, responding to the temperature control instruction, determining a current reaction object, and inquiring temperature control information of the current reaction object, wherein the temperature control information comprises an initial cascade control parameter and a first cascade control parameter corresponding to a first target temperature;
generating first control information based on the initial cascade control parameters, and sending the first control information to a target controller group, wherein the first control information is used for indicating the target controller group to control a heat source valve to gradually increase the valve opening, the heating slope of a polymerization kettle is maintained at a first slope, and the target controller group comprises a first target controller corresponding to the polymerization kettle and a second target controller corresponding to a jacket arranged outside the polymerization kettle;
When the current kettle temperature reaches the first target temperature, generating second control information based on the first cascade control parameter, and sending the second control information to the target controller group, wherein the second control information is used for indicating the target controller group to control the heat source valve to gradually reduce the valve opening, the heating slope is maintained at a second slope, and the second slope is smaller than the first slope.
2. The method of claim 1, wherein the temperature control information further comprises a second cascade control parameter corresponding to a second target temperature, the second target temperature being greater than the first target temperature;
the method further comprises the steps of:
when the current kettle temperature reaches the second target temperature, acquiring the lag time of the polymerization kettle, generating third control information based on the second cascade control parameter, and sending the third control information to the target controller group, wherein the third control information is used for indicating the target controller group to control a cold source valve to increase the valve opening, and maintaining the heating slope to be zero in the lag time.
3. The method of claim 2, wherein the second target temperature is set based on a target reaction temperature of the current reaction object and a historical average overshoot temperature of the polymerization kettle.
4. The method of claim 3, wherein the temperature control information further comprises a third cascade control parameter corresponding to the second target temperature;
after the third control information is sent to the target controller group, the method further includes:
and after the hysteresis time length, generating fourth control information based on the third cascade control parameter, and sending the fourth control information to the target controller group, wherein the fourth control information is used for indicating the target controller group to control the cold source valve to close a valve and increasing the current kettle temperature to the target reaction temperature.
5. The method of claim 3, wherein the temperature control information further comprises a fourth cascade control parameter corresponding to the target reaction temperature;
the method further comprises the steps of:
when the current kettle temperature reaches the target reaction temperature, generating fifth control information based on the fourth cascade control parameter, and sending the fifth control information to the target controller group, wherein the fifth control information is used for indicating the target controller group to control the opening of the cold source valve and the closing of the heat source valve, and after a first preset reaction time period, controlling the cold source valve to gradually reduce the valve opening and controlling the heat source valve to gradually increase the valve opening, so that the current kettle temperature is maintained at the target reaction temperature.
6. The method of claim 5, wherein the temperature control information further comprises a fifth cascade control parameter;
after the fifth control information is sent to the target controller group, the method further includes:
after a second preset reaction time length, generating sixth control information based on the fifth cascade control parameter, and sending the sixth control information to the target controller group, wherein the sixth control information is used for indicating the target controller group to close the heat source valve and controlling the cold source valve to gradually increase the valve opening, so that the cooling slope of the polymerization kettle is maintained at a third slope, and the absolute value of the third slope is larger than that of the first slope.
7. The method of claim 6, wherein the temperature control information further comprises a sixth cascade control parameter corresponding to a third target temperature;
after the sixth control information is sent to the target controller group, the method further includes:
when the current kettle temperature reaches the third target temperature, generating seventh control information based on the sixth cascade control parameter, and sending the seventh control information to the target controller group, wherein the seventh control information is used for indicating the target controller group to control the cold source valve to gradually reduce the valve opening, the cooling slope is maintained at a fourth slope until the current kettle temperature reaches the fourth target temperature, and the absolute value of the fourth slope is smaller than the absolute value of the second slope.
8. A temperature grading control device for a polymerizer, the device comprising:
the device comprises a receiving module, a control module and a control module, wherein the receiving module is used for responding to a temperature control instruction after receiving the temperature control instruction, determining a current reaction object, and inquiring temperature control information of the current reaction object, wherein the temperature control information comprises an initial cascade control parameter and a first cascade control parameter corresponding to a first target temperature;
the first control module is used for generating first control information based on the initial cascade control parameters, sending the first control information to a target controller group, wherein the first control information is used for indicating the target controller group to control a heat source valve to gradually increase the valve opening degree and maintaining the heating slope of the polymerization kettle at a first slope;
and the second control module is used for generating second control information based on the first cascade control parameter when the current kettle temperature reaches the first target temperature, sending the second control information to the target controller group, wherein the second control information is used for indicating the target controller group to control the heat source valve to gradually reduce the valve opening degree, and maintaining the heating slope at a second slope which is smaller than the first slope.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1-7 when the computer program is executed.
10. A computer readable storage medium having stored thereon a computer program having instructions stored therein, which when run on a computer or processor, cause the computer or processor to perform the steps of the method according to any of claims 1-7.
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|---|---|---|---|
| CN202311709830.7A CN117590882A (en) | 2023-12-13 | 2023-12-13 | Temperature grading control method and device of polymerization kettle and electronic equipment |
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| CN202311709830.7A CN117590882A (en) | 2023-12-13 | 2023-12-13 | Temperature grading control method and device of polymerization kettle and electronic equipment |
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