Central dust collection system maintenance precautions is a dry dedusting device, which is suitable for collecting fine, dry and non fibrous dust. It not only has the characteristics of strong dust removal capacity, high dedusting efficiency, low emission concentration, but also has the characteristics of stability and reliability, low gas consumption, and small floor area, especially suitable for handling smoke with large air volume The working mechanism of central dust collection system maintenance precautions is that the dust laden flue gas passes through the filter materials, and the dust particles are filtered. The filter materials capture coarse dust mainly by inertial collision, and the filter materials capture fine dust mainly by diffusion and screening. The dust layer of the filter material also has a certain filtering effect.

The dedusting effect of central dust collection system maintenance precautions is related to many factors, but mainly depends on the filter material. The filter material of central dust collection system maintenance precautions is cloth or felt woven from synthetic fiber, natural fiber or glass fiber. The cloth or felt shall be sewn into cylindrical or flat filter bags as required. According to the nature of flue gas, select the filter material suitable for the application conditions. Generally, when the flue gas temperature is lower than 120 ℃ and the filter material is required to have acid resistance and durability, polyester flannelette and polyester needle felt are often selected; Graphite glass fiber cloth is mainly used to treat high-temperature flue gas (250 ℃); In some special cases, carbon fiber filter materials are selected.

With the continuous increase of dust on the filter bag surface, the pressure difference between the inlet and outlet of the precipitator also rises. When the resistance of the dust remover reaches the set value, the control system sends out the ash cleaning command, and the ash cleaning system starts to work. Firstly, the solenoid valve is opened immediately after receiving the signal, so that the compressed air in the upper air chamber of the small diaphragm is discharged. Due to the change of the force on both ends of the small diaphragm, the exhaust channel closed by the small diaphragm is opened, and the compressed air in the upper air chamber of the large diaphragm is discharged from this channel. The force on both ends of the large diaphragm changes, so that the large diaphragm acts. The closed output port is opened, and the compressed air in the air bag is sprayed into the bag through the output pipe and the blowing pipe, so as to achieve ash removal. When the control signal stops, the solenoid valve is closed, the small diaphragm and the large diaphragm are reset successively, and the injection stops.

It is very important to control the speed of flue gas passing through the filter material (called filtering speed) during the operation of central dust collection system maintenance precautions. Generally, the filtration rate is 0.5-2m/min, and the filtration rate is higher than 0.1 μ The particle efficiency of m can reach more than 99%, and the resistance loss of equipment is about 980-I470Pa.

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