Automatic control system for mixed liquid separation device in lithium battery separator production

Abstract

This invention relates to the field of automated control technology for the separation process of dichloromethane-white oil mixtures, and discloses an automated control system for a mixture separation device in lithium battery separator production. The system includes: a human-machine interface module controlled by a first microcontroller and a data acquisition and processing module controlled by a second microcontroller. The human-machine interface module and the data acquisition and processing module communicate via a serial port between the microcontrollers. The automated control system utilizes a human-machine collaborative approach to control instruments and / or pumps for real-time, manually assisted monitoring of the entire dichloromethane-white oil mixture separation process, and allows for real-time modification of process parameters based on on-site requirements. Based on a human-machine interface design and implementation method, this invention achieves the technical effect of human-machine collaborative control of instruments and / or pumps in the process of separating dichloromethane-white oil mixtures.

Description

Technical Field

[0001] The invention relates to the technical field of automated control of a dichloromethane-white oil mixed liquid separation process, in particular to an automated control system for a mixed liquid separation device in lithium battery diaphragm production. Background Art

[0002] The lithium battery diaphragm industry usually uses white oil as a porogen in the wet film making process and uses dichloromethane as an extractant for white oil. The white oil content in the mixed liquid discharged from the diaphragm production line is generally below 5wt%, and the dichloromethane content is above 95wt%. At present, the separation and recovery of the dichloromethane-white oil mixture is mainly carried out by distillation. The specific process flow is as follows: the dichloromethane-white oil mixture is pumped into the stripping tower, and the feed is controlled by a flow meter; the top of the stripping tower is operated at normal pressure to produce dichloromethane and water; the gas phase components at the top of the tower are condensed in the condenser and sent to the dichloromethane and water separation tank; the bottom of the tower is directly heated by water vapor, and the material is extracted by liquid level control, and is pumped into the heat exchanger for heat exchange and then sent to the white oil-water separation tank; in the oil and water In the layer tank, the water layer is at the bottom and the oil layer is at the top. The upper white oil is controlled by a differential pressure level gauge, extracted by a pump and sent to a heat exchanger for heating and sent to a vacuum drying tower; the gas phase coming out of the top of the tower is condensed to obtain the white oil product; in the dichloromethane and water layer tank, the upper layer is the water phase and the lower layer is the dichloromethane phase; the dichloromethane phase is controlled by a differential pressure level gauge and is pumped to a dichloromethane distillation tower. The tower is operated at normal pressure, and the tower kettle is heated by steam to obtain dichloromethane that meets the requirements, and the product is sent to the dichloromethane product tank. Summary of the invention

[0003] The present invention provides an automated control system for a mixed liquid separation device in the production of lithium battery diaphragms. The automated control system is based on a human-machine interactive design and implementation method, and achieves the technical goal of human-machine collaborative control of instruments and / or pump groups in the process of separating a dichloromethane-white oil mixed liquid.

[0004] The present invention provides the following technical solutions:

[0005] An automated control system for a mixed liquid separation device in the production of lithium battery separators, comprising: a human-machine interaction function module controlled by a first single-chip microcomputer, and a data acquisition and processing module controlled by a second single-chip microcomputer, wherein the human-machine interaction function module and the data acquisition and processing module communicate via a serial port between the single-chip microcomputers;

[0006] The automated control system utilizes human-machine collaboration to control instruments and / or pump groups to conduct manual-assisted real-time monitoring of the entire process of separating the dichloromethane-white oil mixture, and to modify process parameters in real time based on on-site needs.

[0007] Preferably, the human-computer interaction function module receives data from the data acquisition and processing module, displays it after processing, and receives setting parameters of the instruments and / or pump groups included in the entire process of separating the dichloromethane-white oil mixture from the user through the human-computer interaction interface, and then sends the parameters to the original data acquisition and processing module to control the operation of the instruments.

[0008] Preferably, the data acquisition and processing module includes a pump control unit and an instrument control unit.

[0009] Preferably, the pump control unit controls the start-up, operation stop indication, fault detection and interlock alarm stop functions of the variable frequency pump group included in the entire process for separating the dichloromethane-white oil mixture.

[0010] Preferably, the instrument control unit performs acquisition and processing operations based on the system's on-site flow, liquid level, pressure and temperature signals for the entire process of separating the dichloromethane-white oil mixture, and determines the opening of the instrument.

[0011] Preferably, the automation control system further comprises a first control master station, a second control master station and a communication protocol management master station;

[0012] The communication protocol management master station defines a protocol for communication between the first control master station and the second control master station, and has data interaction with the first control master station and the second control master station;

[0013] The first control main station, the second control main station and the human-computer interaction function module cooperate to implement logical judgment on the auxiliary collaboration authority of users participating in the human-computer collaboration.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] The present invention independently constructs a method for implementing logical judgment on the auxiliary collaboration authority of users participating in human-machine collaboration in the process of separating a dichloromethane-white oil mixture. This method can effectively ensure that users participating in the human-machine collaboration control instrument and / or pump group are legally authorized.

[0016] The method of human-machine collaborative control of instruments and / or pump groups provided by the present invention can perform human-assisted real-time monitoring of the entire process of separating the dichloromethane-white oil mixture, and can modify the process parameters in real time based on on-site requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a mixed liquid separation device in the production of lithium battery separators;

[0018] Figure 2This is the architecture diagram of the automated control system for the mixed liquid separation device in the production of lithium battery separators. DETAILED DESCRIPTION

[0019] Embodiment 1:

[0020] A mixed liquid separation device in the production of lithium battery diaphragms, such as Figure 1 As shown, the mixed liquid separation device is used to separate the dichloromethane-white oil mixed liquid, and the automatic control components included are as follows:

[0021] A first variable frequency pump for delivering the dichloromethane-white oil mixture into the stripping tower;

[0022] A flow controller for controlling the feed amount of the dichloromethane-white oil mixture;

[0023] A first pressure controller for controlling the working pressure parameters in the stripping tower;

[0024] A first temperature controller for controlling the operating temperature parameters in the stripping tower;

[0025] A second variable frequency pump for extracting the lower layer of dichloromethane in the first stratification tank (the gas phase component at the top of the stripping tower is sent to the first stratification tank) and sending it to the distillation tower;

[0026] A first liquid level controller for controlling the production flow rate of the lower dichloromethane phase in the first stratification tank;

[0027] A third variable frequency pump for extracting materials from the kettle in the stripping tower and sending them to the second stratification tank;

[0028] A fourth variable frequency pump for extracting the upper layer of white oil in the second stratification tank and sending it to the vacuum drying tower;

[0029] A second liquid level controller for controlling the production flow of the upper layer of white oil in the second stratification tank;

[0030] A second pressure controller for controlling the working pressure parameters in the vacuum drying tower;

[0031] The second temperature controller is used to control the working temperature parameters in the vacuum drying tower.

[0032] Embodiment 2:

[0033] An automated control system for a mixed liquid separation device in the production of lithium battery separators, such as Figure 2 As shown, it includes: a human-computer interaction function module controlled by a first single-chip microcomputer, a data acquisition and processing module controlled by a second single-chip microcomputer, and the human-computer interaction function module and the data acquisition and processing module communicate through the serial port between the single-chip microcomputers;

[0034] Human-computer interaction function module: on the one hand, it receives data from the data acquisition and processing module, processes it and displays it on the touch screen; on the other hand, it receives the user's setting parameters for the instrument and pump group through the human-computer interaction interface, and sends the parameters to the original data acquisition and processing module to control the operation of the instrument;

[0035] The data acquisition and processing module includes a pump control unit and an instrument control unit. The pump control unit mainly controls the start-up, operation stop indication, fault detection, and interlock alarm stop functions of the variable frequency pump group. The instrument control unit collects and processes the on-site flow, liquid level, pressure, and temperature signals according to the system to obtain the results, determine the opening of the instrument, and ensure that the above variables are maintained within the appropriate range that meets the process requirements;

[0036] The automated control system for the mixed liquid separation device in the production of lithium battery diaphragms also includes a first control master station, a second control master station and a communication protocol management master station.

[0037] Embodiment 3:

[0038] The workflow for users to set the parameters of the instrument and / or pump group through the human-machine interaction interface on the human-machine interaction function module is as follows:

[0039] The communication protocol management master station defines the protocol for communication between the first control master station and the second control master station. The specific protocol is as follows:

[0040] Define two groups of order q (G1, +) and (G T , ·), where q≥2 l And l is a system security parameter;

[0041] Define a bilinear pair e: G1×G1→G T , P is the generator of group G1;

[0042] Define two collision-resistant hash functions:

[0043] H1: {0,1} ∞ →G1;

[0044] H2: {0,1} ∞ →Z q * ;

[0045] Then, the following operations are performed according to the above communication protocol:

[0046] Construct a communication management authority credential pair {first communication management authority credential C1∈Z q * , the second communication management authority certificate C2 = C1 × P};

[0047] According to the device information ID of the first control master stationMS1 ∈{0,1} ∞ , construct the communication authority certificate pair {first communication authority certificate C MS1-1 =H1(ID MS1 ), second communication authorization certificate C MS1-2 =C1×C MS1-1 ;

[0048] According to the device information ID of the second control master station MS2 ∈{0,1} ∞ , construct the communication authority certificate pair {first communication authority certificate C MS2-1 =H1(ID MS2 ), second communication authorization certificate C MS2-2 =C1×C MS2-1 ;

[0049] When user Ui requests to set the parameters of the instrument or / and pump group, user Ui will send his work permission credential C Ui Submit to the human-computer interaction function module through the touch screen;

[0050] The human-computer interaction function module will work permission certificate C Ui Submit to the first control master station, the first control master station retrieves the user work authority certificate table, and searches for the work authority certificate C from the user work authority certificate table Ui ;

[0051] If the work permission certificate C is found in the user work permission certificate table Ui , it means that user Ui is an authorized user, and the first control master station executes the following procedures:

[0052] Generate a success status code μ∈{0,1} ∞ ;

[0053] The first communication authority certificate C belonging to the second control master station is retrieved from the communication protocol management master station MS2-1 and the second communication authorization certificate C belonging to the first control master station MS1-2 ;

[0054] According to the communication protocol rules, the permission number k=H2(μ∥e(C MS2-1 ,C MS1-2 ));

[0055] The first control master station returns the success status code μ and the authority number k to the human-computer interaction function module;

[0056] If the work authorization certificate C is not found in the user work authorization certificate table Ui, it means that user Ui is not an authorized user. At this time, the first control master station generates and returns a failure status code to the human-computer interaction function module. At this time, user Ui cannot obtain the authority to set the parameters of the instrument or / and the pump group through the human-computer interaction interface;

[0057] The human-machine interaction function module carries the success status code μ and the authority number k to request the second control master station to set the parameters of the instrument and / or pump group. At this time, the second control master station executes the following procedure:

[0058] The first communication permission certificate C belonging to the first control master station is retrieved from the communication protocol management master station MS1-1 and the second communication authorization certificate C belonging to the second control master station MS2-2 ;

[0059] Based on the first communication authorization certificate C MS21-1 , Second communication authority certificate C MS2-2 and the success status code μ, calculate the permission number k'=H2(μ∥e(C MS1-1 ,C MS2-2 ));

[0060] When the directly received authority number k is equal to the calculated authority number k', the second control master station grants the operation authority to the human-computer interaction function module. At this time, the user Ui obtains the authority to execute the setting of the parameters of the instrument and / or the pump group through the human-computer interaction interface; otherwise, the user Ui cannot obtain the authority to execute the setting of the parameters of the instrument and / or the pump group through the human-computer interaction interface.

Claims

1. The automatic control system of the mixed liquid separation device in the production of lithium battery diaphragm is characterized by: include: A human-computer interaction function module controlled by the first single-chip microcomputer and a data acquisition and processing module controlled by the second single-chip microcomputer, wherein the human-computer interaction function module and the data acquisition and processing module communicate with each other through the serial port between the single-chip microcomputers; The automated control system uses human-machine collaboration to control instruments and / or pump groups to conduct manual-assisted real-time monitoring of the entire process of separating the dichloromethane-white oil mixture, and to modify the process parameters in real time based on on-site needs; The automation control system also includes a first control master station, a second control master station and a communication protocol management master station; The communication protocol management master station defines a protocol for communication between the first control master station and the second control master station, and has data interaction with the first control master station and the second control master station; The first control main station, the second control main station and the human-machine interaction function module cooperate to implement logical judgment on the auxiliary collaboration authority of users participating in human-machine collaboration; The workflow for users to set the parameters of the instrument and / or pump group through the human-machine interaction interface on the human-machine interaction function module is as follows: The communication protocol management master station defines the protocol for communication between the first control master station and the second control master station. The specific protocol is as follows: Define two groups of order q (G1, +) and (G T , ·), where q≥2 l and l is a system safety parameter; Define a bilinear pairing e :G1×G1→G T , P is the generator of group G1; Define two collision-resistant hash functions: H1: {0,1} ∞ →G1; H2:{0,1} ∞ →Z q * ; Then, the following operations are performed according to the above communication protocol: Construct a communication management authority credential pair {first communication management authority credential C1∈Z q * , the second communication management authority certificate C2=C1×P}; According to the device information ID of the first control master station MS1 ∈{0,1} ∞ , construct the communication authority certificate pair {first communication authority certificate C MS1-1 =H1(ID MS1 ), second communication authorization certificate C MS1-2 =C1×C MS1-1 ; According to the device information ID of the second control master station MS2 ∈{0,1} ∞ , construct the communication authority certificate pair {first communication authority certificate C MS2-1 =H1(ID MS2 ), second communication authorization certificate C MS2-2 =C1×C MS2-1 ; When user Ui requests to set the parameters of the instrument or / and pump group, user Ui will send his work permission credential C Ui Submit to the human-computer interaction function module through the touch screen; The human-computer interaction function module will work permission certificate C Ui Submit to the first control master station, the first control master station retrieves the user work authority certificate table, and searches for the work authority certificate C from the user work authority certificate table Ui ; If the work permission certificate C is found in the user work permission certificate table Ui , it means that user Ui is an authorized user, and the first control master station executes the following procedures: Generate a success status code μ∈{0,1} ∞ ; The first communication authority certificate C belonging to the second control master station is retrieved from the communication protocol management master station MS2-1 and the second communication authorization certificate C belonging to the first control master station MS1-2 ; According to the communication protocol rules, the permission number k=H2(μǁ e (C MS2-1 ,C MS1-2 )); The first control master station returns the success status code μ and the authority number k to the human-computer interaction function module; If the work authorization certificate C is not found in the user work authorization certificate table Ui , it means that user Ui is not an authorized user. At this time, the first control master station generates and returns a failure status code to the human-computer interaction function module. At this time, user Ui cannot obtain the authority to set the parameters of the instrument or / and the pump group through the human-computer interaction interface; The human-machine interaction function module carries the success status code μ and the authority number k to request the second control master station to set the parameters of the instrument and / or pump group. At this time, the second control master station executes the following procedure: The first communication permission certificate C belonging to the first control master station is retrieved from the communication protocol management master station MS1-1 and the second communication authorization certificate C belonging to the second control master station MS2-2 ; Based on the first communication authorization certificate C MS21-1 , Second communication authority certificate C MS2-2 and success status code μ, calculate the permission number k'=H2(μǁ according to the communication protocol rules e (C MS1-1 ,C MS2-2 )); When the directly received permission number k is equal to the calculated permission number k', the second control master station grants the operation permission to the human-computer interaction function module. At this time, the user Ui obtains the permission to set the parameters of the instrument or / and the pump group through the human-computer interaction interface; On the contrary, user Ui cannot obtain the authority to set the parameters of the instrument or / and pump group through the human-machine interaction interface.

2. The automatic control system for the mixed liquid separation device in the production of lithium battery separators according to claim 1, characterized in that: The human-computer interaction function module receives data from the data acquisition and processing module, displays it after processing, and receives the setting parameters of the instruments and / or pump groups included in the entire process of separating the dichloromethane-white oil mixture from the user through the human-computer interaction interface, and then sends the parameters to the original data acquisition and processing module to control the operation of the instruments.

3. The automatic control system for the mixed liquid separation device in the production of lithium battery separators according to claim 1, characterized in that: The data acquisition and processing module includes a pump control unit and an instrument control unit.

4. The automatic control system for the mixed liquid separation device in the production of lithium battery separators according to claim 3, characterized in that: The pump control unit is used to control the start-up, operation stop indication, fault detection and interlock alarm stop functions of the variable frequency pump group included in the entire process of separating the dichloromethane-white oil mixed liquid.

5. The automatic control system for the mixed liquid separation device in the production of lithium battery separators according to claim 3, characterized in that: The instrument control unit performs acquisition and processing operations according to the on-site flow, liquid level, pressure and temperature signals of the entire process of separating the dichloromethane-white oil mixed liquid, and determines the opening of the instrument.

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