A device and method for controlling wind pressure of exhaust pipe of aluminum electrolytic cell

Abstract

The present invention discloses a wind pressure control device and method for exhaust pipe of aluminum electrolytic cell, including a control center, a detection module, a control device, a display module and a remote terminal, wherein the detection module, the control device, the operation indication module and the display module are connected to the control center, the control center is connected to the remote terminal through a communication module, the detection module is connected to the control device, the detection module is used to detect the valve opening and the exhaust pipe temperature and pipeline pressure after the valve, and the display module is used to display the valve opening, pipeline pressure and pipeline temperature. The present invention automatically controls the valve opening value by automatically detecting the temperature and pressure of the exhaust branch pipe and the opening size of the valve, which can improve the flue gas collection efficiency of the electrolytic cell, reduce the heat loss risk of the electrolytic cell and the negative pressure of the air compressor station system, reduce energy loss, greatly improve detection efficiency, reduce labor intensity, and provide timely data, thereby reducing the heat loss risk of the electrolytic cell.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum oxide unloading equipment for an aluminum electrolytic cell, and relates to a device and method for controlling the wind pressure of a smoke exhaust pipe of an aluminum electrolytic cell. Background Art

[0002] As an electrochemical reaction, aluminum electrolysis will produce a large amount of flue gas emissions during the reaction process, such as CO, CO2, HF and other gases. Among them, HF, as a harmful gas, will seriously endanger the health of employees. Therefore, when collecting and purifying the flue gas of the electrolytic cell, the quality of the gas collection efficiency will be directly related to the success or failure of the flue gas purification system and the environmental benefits. During the production operation, the flue gas recovery is collected and purified by a unified air compressor station. Due to the difference in the distribution position of the air compressor station and the exhaust branch pipes of each electrolytic cell, the negative pressure distribution of each exhaust branch pipe is extremely uneven (the branch pipe close to the main pipe of the air compressor station has a large negative pressure, that is, the flue gas flow rate is large). This imbalance will cause some of the flue gas in the electrolytic cell to not be completely collected, and escape from the cell cover, thereby polluting the environment and endangering the health of personnel. In addition, if the flue gas flow rate of the electrolytic cell exhaust pipe is too large, it will also cause excessive heat loss in the upper part of the electrolytic cell, increase the working voltage of the cell, and have an obvious cold trend. The long voltage swing time seriously affects the stable operation of the electrolytic cell.

[0003] At present, the factory relies on manual timing adjustment to control the opening of each exhaust branch valve. Workers use handheld pressure measuring instruments to detect the pressure of each exhaust branch, and then manually adjust the opening of the corresponding exhaust branch valve according to the pressure value. This method has the disadvantages of long time consumption, high labor intensity, large errors, and delayed detection data, which increases the risk of heat loss in the electrolyzer. In order to solve this series of problems, a safe, timely, accurate and convenient measurement and control method is urgently needed. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the technical defects in flow measurement and valve body control of the exhaust pipe of the electrolytic cell in the existing aluminum electrolysis workshop, a wind pressure control device and method for the exhaust pipe of the aluminum electrolysis cell is provided to overcome the many defects of the above-mentioned manual control, improve the fume collection efficiency of the electrolytic cell, reduce the heat loss risk of the electrolytic cell and the negative pressure of the air compression station system, and reduce energy loss.

[0005] The technical solution adopted by the present invention is: a wind pressure control device for an aluminum electrolytic cell exhaust pipe, including a control center, a detection module, a control device, a display module and a remote terminal. The detection module, the control device, the operation indication module and the display module are connected to the control center, the control center is connected to the remote terminal through a communication module, the detection module is connected to the control device, the detection module is used to detect the valve opening and the exhaust pipe temperature and pipeline pressure after the valve, and the display module is used to display the valve opening, pipeline pressure and pipeline temperature.

[0006] Preferably, the above-mentioned aluminum electrolysis cell exhaust pipe wind pressure control device also includes an operation prompt module, and the operation indication module is used to indicate the operation status of the pressure sensor, valve body driver, and temperature sensor connected to the control center.

[0007] Preferably, the pressure sensor and the temperature sensor are both provided with dustproof protective covers to prevent dust in the exhaust pipe from affecting the sensors and causing the sensors to malfunction.

[0008] Preferably, the communication module includes a serial port, an Ethernet module and a WiFi module.

[0009] Preferably, the above-mentioned remote center includes a PC, a data center server and a portable terminal, and the remote terminal is connected to the data center server.

[0010] A control method for an aluminum electrolysis cell exhaust pipe wind pressure control device, the method comprising the following steps:

[0011] Step 1: Equipment self-check, that is, determine whether the valve body driver, temperature sensor, and pressure sensor are operating normally. If the pressure sensor operation indicator, valve body driver operation indicator, and temperature sensor operation indicator are always on, the branch pipe smoke exhaust is normal, and step 2 is performed; if the pressure sensor operation indicator, valve body driver operation indicator, and temperature sensor operation indicator are flashing, the branch pipe smoke exhaust is abnormal, and step 3 is performed;

[0012] Step 2: Detect the temperature value, pressure value and valve opening value in the exhaust pipe, transmit the temperature value, pressure value and valve opening value to the data center server through the communication module, and execute step 4;

[0013] Step 3: Push the abnormal exhaust branch pipe number to the maintenance personnel and administrator, and execute step 6;

[0014] Step 4: Determine whether the detected pressure value, temperature value, and valve opening value match the established thermal balance and air volume control model. If not, execute step 5; if matched, execute step 1;

[0015] Step 5: Adaptively control the valve opening according to the detection data and the established control model;

[0016] Step 6: Wait for maintenance personnel to repair the abnormal point;

[0017] Step 7: After the maintenance personnel have completed the inspection and the equipment is running normally, proceed to step 1.

[0018] The matching method of the thermal balance and air volume control model in step 4 is: when the detected pressure value, temperature value and valve opening are within the set numerical range, they are considered to be matched. If they exceed the set numerical range, the valve needs to be controlled to adjust the valve opening.

[0019] The method for adaptively controlling the valve opening in step five is: according to the valve opening value level corresponding to the temperature value and pressure value range set in the thermal balance and air volume control model, when the temperature value and pressure value detected in real time no longer correspond to the valve opening value level, the system automatically gives instructions to control the valve drive module to adjust the valve opening so that the temperature and pressure values ​​return to the normal range.

[0020] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention automatically detects the temperature and pressure of the smoke exhaust branch pipe and the opening size of the valve, and automatically controls the valve opening value, which can improve the smoke collection efficiency of the electrolytic cell, reduce the heat loss risk of the electrolytic cell and the negative pressure of the air compression station system, reduce energy loss, greatly improve detection efficiency, reduce labor intensity, and provide timely data, thereby reducing the heat loss risk of the electrolytic cell. It effectively solves the defects of manual detection in the prior art, such as long time consumption, high labor intensity, large errors, and delayed detection data, thereby increasing the heat loss risk of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the control principle connection structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the on-site installation connection structure of the present invention;

[0023] Figure 3 The figure is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Example 1: Figure 1As shown, a wind pressure control device for exhaust pipe of aluminum electrolytic cell includes a field end and a back-end end. The field end mainly includes a control center, a detection module, a control device, a display module, an operation indication module, a communication module, etc.; the back-end mainly includes a data center server, a PC, a portable terminal, etc. The detection module, the control device, the operation indication module, the operation prompt module and the display module are connected to the control center, the control center is connected to the remote terminal through the communication module, the detection module is connected to the control device, the detection module is used to detect the valve opening and the exhaust pipe temperature and pipeline pressure after the valve, the display module is used to display the valve opening, pipeline pressure and pipeline temperature; the operation indication module is used to indicate the operation of the pressure sensor, the valve body driver and the temperature sensor. The communication module includes a serial port, an Ethernet module and a WiFi module; the remote center includes a PC end, a data center server and a portable terminal, and the remote terminal is connected to the data center server; the pressure sensor and the temperature sensor are both provided with dustproof protective covers to prevent the dust in the exhaust pipe from affecting the sensor and causing the sensor to fail to work properly.

[0026] The wind pressure control device of the exhaust pipe of the aluminum electrolytic cell is installed on site according to the structure as follows Figure 2 As shown, the display module 4 is used to display the pressure value, valve opening value and temperature value in the exhaust pipe; the operation indication module 5 is used to indicate the operation status of the pressure sensor, the valve driver and the temperature sensor; the control center 6 is used to instruct the detection module to collect the temperature, pressure and valve opening value in the exhaust pipe, and transmit the detected values ​​to the data center server through the communication module, and realize adaptive control of the valve opening according to the detection data and the established control model; the control cabinet 7 is used to place the display module 4, the operation indication module 5, the control center 6, the communication module 12, etc., and is installed near the slot control machine under the exhaust pipe; the detection module includes a temperature sensor 8 and a negative pressure flowmeter 9 and the valve opening collected by the valve driver; the temperature sensor 8 is used to detect the temperature value in the exhaust pipe to provide a control basis for the valve adjustment; the negative pressure flowmeter 9 is used to detect the pressure value in the exhaust pipe to provide a control basis for the valve adjustment; the valve driver 10 is used to perform the valve opening adjustment in the exhaust pipe; the valve 11 is used to control the flue gas flow in the exhaust pipe to avoid heat loss in the electrolytic cell. The temperature sensor 8 and the negative pressure flow meter 9 are installed after the valve 11.

[0027] Backend: Data center server 1 is arranged in the central computer room of the enterprise, and is used to establish a data center to store monitoring data and PC-side programs; PC terminal 2 is a PC used by all enterprises, and is used to monitor the exhaust pipe monitoring data, including the temperature value, pressure value, valve opening value, etc. in the exhaust pipe. It also realizes the directional push function of abnormal information of abnormal exhaust branch pipes.

[0028] Example 2: Figure 3As shown, a control method of a wind pressure control device for an aluminum electrolytic cell exhaust pipe comprises the following steps:

[0029] S0: Start the system;

[0030] S1: Equipment self-check, that is, to determine whether the valve body driver, temperature sensor, and pressure sensor are operating normally, and set the normal exhaust branch pipe pressure sensor operating indicator, valve body driver operating indicator, and temperature sensor operating indicator to a constant light state; and execute S2. Set the abnormal exhaust branch pipe pressure sensor operating indicator, valve body driver operating indicator, and temperature sensor operating indicator to a flashing state; and execute S3;

[0031] S2: Detect the temperature, pressure and valve opening value in the exhaust pipe, and transmit the detected values ​​to the data center server through the communication module, and execute S4;

[0032] S3: Push the abnormal exhaust branch pipe number to the maintenance personnel and administrator, and execute S6;

[0033] S4: Determine whether the detected pressure value, temperature value, and valve opening value match the established thermal balance and air volume control model. If not, execute S5; if matched, execute S1;

[0034] Among them, the matching method of thermal balance and air volume control model is: when the detected pressure value, temperature value and valve opening are within the set value range, it is considered to be matched; if it exceeds the set value range, the valve needs to be controlled to adjust the valve opening.

[0035] S5: Adaptive control of the valve opening is achieved based on the detection data and the established control model;

[0036] The valve body opening adaptive control method is: according to the valve opening value level corresponding to the temperature value and pressure value range set in the heat balance and air volume control model, when the temperature value and pressure value detected in real time no longer correspond to the valve opening value level, the system automatically gives instructions to control the valve drive module to adjust the valve opening so that the temperature and pressure values ​​return to the normal range;

[0037] S6: Wait for maintenance personnel to repair the abnormal point;

[0038] S7: After the maintenance personnel complete the inspection and the equipment runs normally, execute S1.

[0039] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A control method for an air pressure control device of an aluminum electrolytic cell exhaust pipe, characterized in that: The wind pressure control device of the exhaust pipe of an aluminum electrolytic cell comprises a control center, a detection module, a control device, a display module and a remote terminal. The detection module, the control device, the operation indication module and the display module are connected to the control center. The control center is connected to the remote terminal through a communication module. The detection module is connected to the control device. The detection module is used to detect the valve opening, the exhaust pipe temperature and the pipe pressure. The display module is used to display the valve opening value, the pipe pressure and the pipe temperature value. The control method comprises the following steps: Step 1: Equipment self-check, that is, determine whether the valve body driver, temperature sensor, and pressure sensor are operating normally. If the pressure sensor operation indicator, valve body driver operation indicator, and temperature sensor operation indicator are always on, the branch pipe smoke exhaust is normal, and step 2 is performed; if the pressure sensor operation indicator, valve body driver operation indicator, and temperature sensor operation indicator are flashing, the branch pipe smoke exhaust is abnormal, and step 3 is performed; Step 2: Detect the temperature value, pressure value and valve opening value in the exhaust pipe, transmit the temperature value, pressure value and valve opening value to the data center server through the communication module, and execute step 4; Step 3: Push the abnormal exhaust branch pipe number to the maintenance personnel and administrator, and execute step 6; Step 4: Determine whether the detected pressure value, temperature value, and valve opening value match the established thermal balance and air volume control model. If not, execute step 5; if matched, execute step 1; Step 5: Adaptively control the valve opening according to the detection data and the established control model; Step 6: Wait for maintenance personnel to repair the abnormal point; Step 7: After the maintenance personnel have completed the inspection and the equipment is running normally, proceed to step 1; The matching method of the heat balance and air volume control model in step 4 is: when the detected pressure value, temperature value and valve opening value are within the set value range, it is considered to be matched; if they are beyond the set value range, the valve needs to be controlled to adjust the valve opening; The method for adaptively controlling the valve opening in step five is: according to the valve opening value level corresponding to the temperature value and pressure value range set in the thermal balance and air volume control model, when the temperature value and pressure value detected in real time no longer correspond to the valve opening value level, the system automatically gives instructions to control the valve body driver to adjust the valve opening so that the temperature value and pressure value return to the normal range.

2. The control method of the wind pressure control device of the exhaust pipe of an aluminum electrolysis cell according to claim 1, characterized in that: It also includes an operation indication module connected to the control center, and the operation indication module is used to indicate the operation status of the pressure sensor, the valve body driver, and the temperature sensor.

3. The control method of the wind pressure control device of the exhaust pipe of an aluminum electrolytic cell according to claim 2, characterized in that: The pressure sensor and the temperature sensor are both provided with dustproof protective covers.

4. The control method of the wind pressure control device of the exhaust pipe of an aluminum electrolytic cell according to claim 1, characterized in that: The communication module includes a serial port, an Ethernet module and a WiFi module.

5. The control method of the wind pressure control device of the exhaust pipe of an aluminum electrolytic cell according to claim 3, characterized in that: The remote terminal includes a PC, a data center server and a portable terminal, and the PC is connected to the data center server.

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