Brief introduction： Bag filter is a dry dust filter device. After using the filter media for a period of time, due to the effect of sieving, collision, retention, bag filter diffusion and electrostatic, a layer of dust accumulates on the surface of the filter bag, this layer of dust is called the primary layer, in the process of movement thereafter, the primary layer becomes the main filter layer of the filter media, relying on the role of the primary layer, the filter media with larger mesh can also obtain a higher filtration efficiency. With the accumulation of dust on the surface of the filter media, the efficiency and resistance of the dust collector increase accordingly. When the pressure difference between the two sides of the filter media is large, some fine dust particles that have been attached to the filter media will be squeezed over, so that the efficiency of the dust collector decreases. In addition, the high resistance of the dust collector will make the air volume of the dust removal system drop significantly. Therefore, after the resistance of the dust collector reaches a certain value, it should be cleared in time. When cleaning ash, the initial layer should not be destroyed, so that the efficiency will not drop. Process flow： The soot generated in the electrostatic furnace passes through the duct under the wind pressure of the fan and enters the dust collector. The dust collector is mainly composed of N dust removal chambers. The purification of the flue gas is achieved by sequentially controlling the N dust chamber inlet valve and the back-suction valve off \ break as well as the mechanical shock beating. The purified flue gas is discharged into the atmosphere through the chimney, while the dust is adsorbed by the filter bag and collected in the ash discharge bin, which is discharged to the ash discharge pipe through the control of the discharger, and then the ash is sent to the encryption bin by the fan, or the dust is sent to the encryption bin by manual or mechanical means. Eventually the dust inside the bin is collected manually from the lower end of the encrypted bin with a cloth bag and transported to the treatment plant. High temperature flue gas purification is carried out on site using bag filter. Considering the actual performance of the equipment, the allowable temperature of the filter bag is about 100℃, which is very different from the high temperature flue gas temperature (generally up to 300℃), so the high temperature flue gas must first be cooled down and the cooling process must be monitored in real time. The specific method is: a temperature sensor is installed at the front and rear of the suction pipe to detect the flue gas temperature at the suction port and at the entrance of the bag filter respectively; an electric butterfly valve is installed in the middle of the pipe, when the temperature detected by the two temperature sensors exceeds the set value, the electric butterfly valve opens to mix in a certain...