Ternary precursor synthesis control system and ternary precursor synthesis control method

Abstract

Disclosed is a ternary precursor synthesis control system, comprising a skid-mounted electric control system unit (1) and a skid-mounted pump-valve system unit (2), wherein the skid-mounted electric control system unit (1) comprises a human-machine interface (101), a controller (102), and an AC servo (103), and the skid-mounted pump-valve system unit (2) comprises a first ball valve (201), a filter (203), a magnetic gear pump (204), a first needle valve (205), an accumulator (206), a second needle valve (207), a pressure transmitter (208), and a Coriolis flowmeter. The present disclosure solves the drawbacks of the traditional working mode and adopts a proportional control mode to achieve precise flow control of saline-alkali ammonia.

Description

Technical Field

[0001] The present invention relates to the field of new energy lithium battery manufacturing equipment, and specifically to a ternary precursor synthesis control system and a ternary precursor synthesis control method. Background Art

[0002] At present, the precursor synthesis process is mainly regulated by pH control: the flow control system fixes the saline flow and ammonia flow, and uses the pH electrode signal as feedback input to perform PID control on the alkali solution flow to stabilize the system pH value.

[0003] The same set of process parameters has different physical and chemical indicators for the synthetic precursor products. Due to insufficient control precision, the repeatability of products with the same process parameters is poor, and manual adjustment of parameters is required to meet the synthesis target requirements.

[0004] The ternary precursor synthesis control system and the ternary precursor synthesis control method involved in the present invention solve the drawbacks of the above-mentioned traditional working mode, and adopt a proportional control mode to achieve precise flow control of saline-alkali ammonia. Summary of the invention

[0005] In order to solve the deficiencies of the above-mentioned prior art, the present invention provides a ternary precursor synthesis control system and a ternary precursor synthesis control method, which realize unmanned process equipment, reduce the number of manual interventions, unified collection, unified monitoring, protective shutdown, remote monitoring, and fault warning. The ternary precursor synthesis control system and the ternary precursor synthesis control method have high control accuracy, safe and reliable operation, and improve work efficiency and management level.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a ternary precursor synthesis control system, the ternary precursor synthesis control system includes a skid-mounted electric control system unit 1 and a skid-mounted pump-valve system unit 2, the skid-mounted electric control system unit 1 includes a human-machine interface 101, a controller 102, and an AC servo 103, and the skid-mounted pump-valve system unit 2 includes a first ball valve 201, a filter 203, a magnetic gear pump 204, a first needle valve 205, an accumulator 206, a second needle valve 207, a pressure transmitter 208, and a Coriolis flowmeter 210;

[0007] The human-machine interface 101 is connected to the controller 102, and the user inputs the corresponding process parameters of the medium through the human-machine interface 101;

[0008] The controller 102 is connected to the AC servo 103 and is used to control the rotation speed of the AC servo 103 according to the process parameters, and the AC servo 103 controls the inflow of the medium;

[0009] The first ball valve 201 is connected to the filter 203, the filter 203 is connected to the magnetic gear pump 204, the magnetic gear pump 204 is connected to the first needle valve 205 and the accumulator 206, the accumulator is connected to the second needle valve 207 and the pressure transmitter 208, the pressure transmitter 208 is connected to the Coriolis flowmeter 210, so that the medium flows from the first ball valve 201 into the filter 203, the filtered medium enters the magnetic gear pump 204 for pressure increase, and then passes through the fully opened first needle valve 205, enters the energy storage tube 206 for pressure stabilization and energy storage, eliminates hydraulic fluctuations, and then passes through the fully opened second needle valve 207, enters the pressure transmitter 208 for real-time pressure detection, and enters the Coriolis flowmeter 210 after the pressure detection;

[0010] The output end of the Coriolis flowmeter 210 is connected to the input end of the controller, so as to send the calculated medium measurement parameters to the controller.

[0011] Preferably, the ternary precursor synthesis control system also includes a back pressure valve 209, a solenoid valve 213, a one-way valve 214, and a third ball valve 215, the Coriolis flowmeter 210 is connected to the back pressure valve 209, and the back pressure valve 209, the first solenoid valve 213, the one-way valve 214, and the third ball valve 215 are connected in sequence.

[0012] A ternary precursor synthesis control method is applied to a ternary precursor synthesis control system, wherein the ternary precursor synthesis control system comprises a skid-mounted electric control system unit 1 and a skid-mounted pump-valve system unit 2, wherein the skid-mounted electric control system unit 1 comprises a human-machine interface 101, a controller 102, and an AC servo 103, and the skid-mounted pump-valve system unit 2 comprises a first ball valve 201, a filter 203, a magnetic gear pump 204, a first needle valve 205, an accumulator 206, a second needle valve 207, a pressure transmitter 208, and a Coriolis flowmeter 210;

[0013] The user inputs corresponding process parameters of the medium through the human-machine interface 101;

[0014] The controller 102 calculates a flow setting parameter of the medium according to the process parameter, and determines a first speed control parameter of the AC servo 103 according to the flow setting parameter;

[0015] The AC servo 103 controls the medium to enter the filter 203 from the first ball valve 201 according to the first speed control parameter. The filtered medium enters the magnetic gear pump 204 for pressure boosting, passes through the fully opened first needle valve 205, enters the energy storage tube 206 for pressure stabilization and energy storage, and eliminates hydraulic fluctuations, and then passes through the fully opened second needle valve 207 to enter the pressure transmitter 208 for real-time pressure detection. After the pressure detection, the medium enters the Coriolis flowmeter 210, and the Coriolis flowmeter 210 calculates the medium measurement parameters;

[0016] The controller 102 calculates the deviation between the medium measurement parameter and the flow setting parameter, and calculates a second speed control parameter according to the difference;

[0017] The AC servo 103 controls the medium to enter according to the second speed control parameter.

[0018] Preferably, the ternary precursor synthesis control system also includes a back pressure valve 209, a solenoid valve 213, a one-way valve 214, and a third ball valve 215, the Coriolis flowmeter 210 is connected to the back pressure valve 209, and the back pressure valve 209, the first solenoid valve 213, the one-way valve 214, and the third ball valve 215 are connected in sequence.

[0019] Preferably, the corresponding process parameters of the medium include: metal ratio, acid radical molecular weight, alkali-salt ratio, ammonia-salt ratio, reactor volume, salt flow setting, and mass concentration.

[0020] Preferably, the flow setting parameters of the medium include: set flow rate, molar mass, mass molar concentration, volume molar concentration, volume flow rate, and residence time.

[0021] Preferably, the medium measurement parameters include: instantaneous flow, density, and temperature parameters.

[0022] Compared with the prior art, the advantages of the present invention are as follows: Compared with the traditional pH value control mode, this solution has unified collection, unified monitoring, emergency shutdown, remote monitoring, and fault warning, which can realize unmanned process equipment, reduce the number of personnel interventions, and greatly improve control accuracy. In addition, this solution has stable performance, safe and reliable operation, and improves work efficiency and management level. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a control logic diagram. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] like Figure 1 As shown:

[0026] A ternary precursor synthesis control system includes 1. a skid-mounted electronic control system unit, 2. a skid-mounted pump-valve system unit. The ternary precursor includes three media: salt, alkali, and ammonia. Each medium has a set of skid-mounted pump-valve systems as shown in the attached figure, for a total of three sets with exactly the same structure. The three media are finally mixed to form a ternary precursor synthesis material.

[0027] The skid-mounted electric control system unit 1 includes a human-machine interface 101, a controller 102, and an AC servo 103. The human-machine interface 101 is connected to the controller 102. The user inputs the corresponding process parameters of the three media of salt, alkali, and ammonia through the human-machine interface 101: metal ratio, acid radical molecular weight, alkali-salt ratio, ammonia-salt ratio, reactor volume, salt flow setting, and mass concentration. The controller unit 102 automatically calculates the flow setting parameters of each medium: set flow, molar mass, mass molar concentration, volume molar concentration, volume flow, and residence time. The controller and the human-machine interface are connected by Ethernet, and the communication protocol adopts the Modbus TCP / IP protocol.

[0028] The controller 102 is connected to the AC servo 103. The controller 102 determines the first speed control parameter of the AC servo (103) according to the flow setting parameter, and outputs the first speed control parameter to the AC servo unit 103 through serial communication. The AC servo includes an AC drive power circuit for a metal salt medium, an AC drive circuit for an alkali solution, an AC drive power circuit for an ammonia solution, and may also include an AC drive power circuit for an additive medium.

[0029] Controller 102 is a special controller with a special process calculation package for ternary precursors. It is connected to the AC servo through a 485 serial communication connection, and can read and write the speed frequency of the AC servo. A 24VDC switch signal is sent to the AC servo through the controller as a start and stop command signal. The controller acts as a ModbusRTU master station and the AC servo acts as a ModbusRTU slave station. The master station and each slave station communicate in a polling manner, and the AC servo feeds back alarm and operating status signals to the controller.

[0030] The first ball valve 201 is connected to the filter 203 , the filter 203 is connected to the magnetic gear pump 204 , the magnetic gear pump 204 is connected to the first needle valve 205 and the accumulator 206 , the accumulator is connected to the second needle valve 207 and the pressure transmitter 208 , and the pressure transmitter 208 is connected to the Coriolis flowmeter 210 . According to the first speed control parameter, the AC servo 103 controls the medium to first enter the filter 203 from the ball valve 201. The ball valve 202 is a cleaning pipeline channel and is closed under normal circumstances. The filtered medium enters the magnetic gear pump 204 for pressure increase, passes through the fully opened needle valve 205, enters the energy storage tube 206 for pressure stabilization and energy storage, eliminates hydraulic fluctuations, and then passes through the fully opened needle valve 207 to enter the pressure transmitter 208 for real-time pressure detection. When the detected pressure is too high, protection is automatically stopped to avoid damage to the pipeline or equipment after overpressure. When the detected pressure is too low, it is not enough to overcome the pressure loss of the downstream pipeline, and it works normally within the pressure working range. The functions of the needle valves 205 and 207 are to open and close slowly and temporarily cut off the medium.

[0031] Then the medium enters the Coriolis flowmeter 210, which measures the instantaneous flow, density, and temperature parameters of the medium. The instantaneous flow is used to calculate the deviation between the flow measurement value and the flow setting value, the density is used for flow compensation, and the temperature is a monitoring parameter and does not participate in the calculation. Then the medium passes through the back pressure valve 209. The function of the back pressure valve 209 is to limit the pressure in front of the back pressure valve to the mechanical setting value of the back pressure valve in advance, so that there is pressure in front of the back pressure valve and it is stable, which can prevent the magnetic gear pump from generating siphoning. The Coriolis flowmeter 210 feeds back the measured parameters to the controller unit 102 through the 485 serial communication method. The controller unit 102 calculates the deviation between the alkali flow measurement value and the flow setting value, the deviation between the ammonia flow measurement value and the flow setting value, and the deviation between the salt flow measurement value and the flow setting value. The optimized PID algorithm is used to calculate and output the second speed control parameter as the input of the AC servo 103, and finally a control closed loop is formed. The control accuracy of the optimized PID algorithm itself is one thousandth. The AC servo unit 103 increases or decreases the speed so that the cumulative deviation value of the entire system in 10 minutes is less than three thousandths, that is, the high-precision control target of instantaneous flow control is achieved. The Coriolis flowmeter and the controller are connected by 485 serial communication, and the communication protocol adopts the Modbus RTU protocol, which can read the instantaneous flow, density, temperature, and cumulative flow of the Coriolis flowmeter.

[0032] The control system also includes a ball valve 211 and a solenoid valve 212 connected in series to form a reflux loop. When the solenoid valve 212 fails and leaks, the reflux loop can be closed by the ball valve 211. The function of the reflux loop is not to transport the medium to the downstream when the flow rate is not adjusted to meet the standard. When the flow rate is adjusted to meet the standard, the solenoid valve 213 is opened to transport the medium to the downstream through the one-way valve 214 and the ball valve 215. The function of the one-way valve 214 is to prevent the medium from flowing back, and the function of the ball valve 215 is to cut off the medium when shutting down.

[0033] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A ternary precursor synthesis control system, characterized in that: The ternary precursor synthesis control system comprises a skid-mounted electric control system unit (1) and a skid-mounted pump-valve system unit (2), wherein the skid-mounted electric control system unit (1) comprises a human-machine interface (101), a controller (102), and an AC servo (103), and the skid-mounted pump-valve system unit (2) comprises a first ball valve (201), a filter (203), a magnetic gear pump (204), a first needle valve (205), an accumulator (206), a second needle valve (207), a pressure transmitter (208), and a Coriolis flowmeter (210); The human-machine interface (101) is connected to the controller (102), and a user inputs corresponding process parameters of a medium through the human-machine interface (101); The controller (102) is connected to the AC servo (103) and is used to control the rotation speed of the AC servo (103) according to the process parameters, and the AC servo (103) controls the inflow of the medium; The first ball valve (201) is connected to the filter (203), the filter (203) is connected to the magnetic gear pump (204), the magnetic gear pump (204) is connected to the first needle valve (205) and the energy accumulator (206), the energy accumulator is connected to the second needle valve (207) and the pressure transmitter (208), and the pressure transmitter (208) is connected to the Coriolis flowmeter (210), so that the medium flows from the first ball valve (201) into the filter (203), the filtered medium enters the magnetic gear pump (204) for pressure increase, then passes through the fully opened first needle valve (205), enters the energy storage tube (206) for pressure stabilization and energy storage, and eliminates hydraulic fluctuations, then passes through the fully opened second needle valve (207), enters the pressure transmitter (208) for real-time pressure detection, and enters the Coriolis flowmeter (210) after the pressure detection; The output end of the Coriolis flowmeter (210) is connected to the input end of the controller, and is used to send the calculated medium measurement parameters to the controller; The ternary precursor synthesis control system also includes a back pressure valve (209), a solenoid valve (213), a one-way valve (214), and a third ball valve (215); the Coriolis flowmeter (210) is connected to the back pressure valve (209); and the back pressure valve (209), the first solenoid valve (213), the one-way valve (214), and the third ball valve (215) are connected in sequence.

2. A ternary precursor synthesis control method, applied to the ternary precursor synthesis control system according to claim 1, wherein: The controller (102) calculates a flow setting parameter of the medium according to the process parameter, and determines a first speed control parameter of the AC servo (103) according to the flow setting parameter; The AC servo (103) controls the medium to enter the filter (203) from the first ball valve (201) according to the first speed control parameter, and the filtered medium enters the magnetic gear pump (204) to increase the pressure, passes through the fully opened first needle valve (205), enters the energy storage tube (206) to stabilize the pressure and store energy to eliminate water fluctuations, and then passes through the fully opened second needle valve (207) to enter the pressure transmitter (208) for real-time pressure detection, and after the pressure detection, enters the Coriolis flowmeter (210), and the Coriolis flowmeter (210) calculates the medium measurement parameters; The controller (102) calculates a deviation between the medium measurement parameter and the flow setting parameter, and calculates a second speed control parameter according to the difference; The AC servo (103) controls the medium to enter according to the second speed control parameter.

3. The ternary precursor synthesis control method according to claim 2, characterized in that: The corresponding process parameters of the medium include: metal ratio, acid radical molecular weight, alkali-salt ratio, ammonia-salt ratio, reactor volume, salt flow setting, and mass concentration.

4. The ternary precursor synthesis control method according to claim 2, characterized in that: The flow setting parameters of the medium include: set flow rate, molar mass, mass molar concentration, volume molar concentration, volume flow rate, and residence time.

5. The ternary precursor synthesis control method according to claim 2, characterized in that: The medium measurement parameters include: instantaneous flow, density, and temperature parameters.

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