Research And Design Of Monitoring System For Flue Gas Temperature And Gas Recovery Of Converter Dry Dedusting

In the process of converter steelmaking,a large amount of polluting gas will be generated,and the random emission will seriously pollute the atmospheric environment.The discharged flue gas contains a large amount of combustible gas.If the discharged flue gas can be dust-recovered and processed,a good Social and economic benefits.The converter's dry dust removal technology has been widely used in the steelmaking industry because of its high gas recovery calorific value,low environmental pollution,and no secondary pollution.But on the other hand,the process of the converter dry dust removal system is more complicated,and it is necessary to adopt corresponding control strategies to improve the purification and recovery quality of flue gas.In the converter dry dust removal system,the temperature of the flue gas at the outlet of the evaporative cooler needs to be reasonably controlled to ensure the subsequent normal operation of the electrostatic precipitator.If the temperature of the flue gas is too low,the flue gas will easily collect after the flue gas enters the electrostatic precipitator At the two poles of the dust removal electric field,the pole distance becomes smaller,resulting in frequent discharges,which may ignite the combustible gas in the flue gas and cause explosion.If the temperature of the flue gas is too high,the dust specific resistance of the dust will be increased,which is not in line with the electrostatic precipitator.Therefore,the corresponding flue gas temperature control strategy needs to be set to ensure the normal operation of the system.This article describes the research background and development overview of the converter dry dust removal system,introduces the process flow of the dry dust removal system,and the function and composition of each part,focusing on the principle of evaporative cooler cooling and dust removal of flue gas,and Control requirements for evaporative coolers.In the converter blowing stage,an automatic control strategy is adopted to establish a control model that takes the cooling water valve opening as input and the evaporative cooler outlet flue gas temperature as output.Based on the obtained model,the relevant controllers are designed.After analyzing the control characteristics of ordinary PID controllers and fuzzy controllers,a fuzzy adaptive PID controller with both advantages of PID control and fuzzy control is designed to improve smoke control.Control quality of gas.Adjust the rotation speed of the induced draft fan to ensure that the pressure at the furnace mouth is always at a slightly positive pressure during the blowing stage,to ensure the smooth recovery of gas and the normal operation of the system.According to the theoretical analysis and laboratory equipment,some hardware is selected and configured,and the control network structure diagram is designed.Perform hardware configuration on the software,set up a control network,configure the communication of the control network,establish a connection between the host computer WinCC and the device,and design part of the monitoring screen.The PLC program of fuzzy adaptive PID control part is written.