In October, the Ministry of Automation of Handan Iron and Steel completed the development of the automatic control system for the No. 7 blast furnace hot blast stove and realized the fully automatic control of the furnace. After the system was put into operation, the wind temperature output was more constant and the gas consumption was reduced by 3%.
The No. 7 blast furnace hot stove was put into production in 2000. Manual manual control was adopted. The staff indicated the value of the oxygen content in the exhaust gas and how fast the dome temperature rose. The artificially set the gas control valve and the opening of the air control valve to control the furnace. However, due to the large number of gas users, frequent fluctuations in gas pressure, manual adjustment is difficult to keep up with the frequency of pressure fluctuations. Post operators must observe gas quality and exhaust gas oxygen content 24 hours a day, not only labor intensity, but also artificial control lags behind, manual The stove effect is not ideal.
In response to this situation, the technical staff of the automation department carefully analyzed the production process and, in accordance with the technical requirements, cooperated with related technology companies to prepare the control program. No.7 blast furnace hot blast stove adopts Modicon PLC control system. The system supports OPC communication protocol and undisturbed downloading function. However, due to the full CPU memory space, the download of the program is limited. In order to solve this problem, technicians try repeatedly to set up a rack and finally realize the expansion of CPU memory. At the same time, in order to ensure the manual and automatic switching of the furnace control, the technicians develop a heartbeat communication monitoring program to monitor the communication status between the manual furnace and the automatic furnace control module. If the automatic burning program fails, the system will switch without disturbance. For the manual furnace state.
During the automatic control of the stove in the hot blast stove, the technical staff of the automation department re-checked all the dome thermocouples, air and gas flow meters, and solved the problem of too large fluctuations in the temperature of the flue and dome during the control process. After the manual switching, the data search and parameter adjustment functions are optimized. The gas pressure is low and the fluctuation is large and the fuzzy control parameters are frequently improved and modified. At the same time, the existing flue temperature control speed does not match the burning time and is transferred. The problem of large drop in the temperature of the vault during small firing was solved one by one.
At present, the automatic firing system has been officially put into use. The system intelligence simulates the manual operation process. According to the change of the gas calorific value, the best air-fuel ratio is calculated automatically and the stability of the air temperature is improved. Under the condition of no mixed air, the temperature difference between the beginning and the end of the air supply is obviously reduced, and the same sending is ensured. Under the premise of wind temperature, it can save more than 3% of gas, greatly reduce the labor intensity of workers, reduce environmental pollution, and achieve optimal control and operation of hot blast stoves.
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