Introduction to pressure loss of pulse bag dust removal equipment: The pressure loss of the dust collector refers to the pressure drop or resistance of the gas from the inlet to the outlet of the boiler pulse dust collector. The pressure loss of bag dust removal depends on the following three factors: 1. Pressure loss of equipment structure. 2. Pressure loss of filter material. Related to the properties of the filter material (such as porosity, etc.). 3. The pressure loss of the dust layer accumulated on the filter material. Introduction to the outlet dust concentration of pulse bag dust removal equipment: The outlet dust concentration refers to the emission concentration of the dust collector, expressed in the same way as the dust concentration. The size of the outlet dust concentration should be based on local environmental requirements or user requirements. The emission concentration of bag filters can generally reach below 50g/Nm3. Take warming measures for gases below the dew point temperature. There are many PPS filter materials used now. The temperature is at 170 degrees. For bag filters, the relationship between operating temperature and dust removal efficiency is not significant, which is different from electrostatic precipitators. For electrostatic precipitators, temperature changes can affect the specific resistance of dust and other factors that affect dust removal efficiency. Introduction to the working process of pulse bag filter: The pulse bag filter consists of an ash hopper, an upper box, a middle box, a lower box, and other parts. The upper, middle, and lower boxes are divided into compartments. During operation, dusty gas enters the ash hopper through the air inlet duct. Coarse dust particles directly fall into the bottom of the ash hopper, while fine dust particles enter the middle and lower boxes upwards with the turning of the airflow. Dust accumulates on the outer surface of the filter bag, and the filtered gas enters the upper box to the clean gas collection pipe exhaust duct, and is discharged to the atmosphere through the exhaust fan. The dust cleaning process involves first cutting off the clean air outlet duct of the room, so that the dust removal bag in the room is in a state of no airflow passing through. Then, the pulse valve is opened and compressed air is used for pulse blowing to clean the dust. The shut-off valve is closed for a sufficient time for the dust peeled off from the filter bag to settle in the ash hopper after spraying, avoiding the phenomenon of dust adhering to the adjacent filter bag surface with the airflow after leaving the filter bag surface. The filter bag is cleaned, and the exhaust valve, pulse valve, and ash discharge valve are fully automatically controlled by a programmable controller. The pulse bag dust collector adopts the technology of segmented air stop pulse jet cleaning, which overcomes the shortcomings of conventional pulse bag dust collectors and segmented back blowing dust collectors. It has low emission concentration, low air leakage rate, low energy consumption, low steel consumption, small footprint, stable operation, and good economic benefits. The pulse bag filter body is divided into several box areas, with 32, 64, 96, 128 bags in each box. And there is a cylinder operated lift valve on the side outlet pipe of each box. When the dust collector filters the dusty gas (or the resistance reaches the preset value), the dust cleaning controller declares a signal. The lift valve of each compartment is initially closed to block the filtered airflow. Then the pulse valve of this box is opened, and compressed air greater than 5kg/cm2 is injected into the clean air chamber to remove dust from the filter bag. After this action is completed (approximately 6-15 seconds), the lift valve is opened from the beginning, allowing the chamber to filter from the beginning, and each step is carried out according to the above requirements to complete all dust cleaning. Pulse dust collector is a device that, when dusty gas enters the dust collector through the air inlet, it first encounters the inclined plate and baffle in the middle of the air inlet and outlet, and the airflow turns to flow into the ash hopper. At the same time, the airflow speed slows down, and due to inertia, coarse particles of dust in the gas directly flow into the ash hopper. Playing the role of pre dust collection, the airflow entering the ash hopper is then deflected upwards and captured on the outer surface of the dust removal filter bag with a metal skeleton inside. The purified gas enters the upper cleaning room of the filter bag chamber and is collected at the air outlet for discharge. During the process of purifying the dusty gas through the filter bag, more and more dust accumulates on the filter bag over time, increasing the resistance of the filter bag and gradually reducing the processing air volume. To work normally, the resistance should be controlled within a range (140-170 mm water column), and the filter bag should be cleaned. During cleaning, the pulse controller sequentially triggers each control valve to open the pulse valve. The compressed air in the air bag is sprayed into the corresponding filter bag through each hole of the spray pipe through the Venturi tube. The dust removal filter bag instantly expands rapidly, causing the dust accumulated on the surface of the filter bag to fall off. The dust falls into the ash hopper and is discharged from the machine through the ash discharge system. As a result, the dust accumulated on the filter bag is periodically pulse blown to clean the dust, allowing the purified gas to pass through normally and the dust removal system to operate.
