Do you know the working principle of box pulse bag filter？

When the dust-laden flue gas enters the ash hopper from the air inlet, some coarse dust particles fall into the ash hopper here due to the principles of inertial collision and natural sedimentation, and most of the dust particles rise with the airflow into the bag room and are filtered. After the bag is filtered, the dust particles are blocked outside the filter bag, and the purified flue gas enters the box from the inside of the filter bag, and then is discharged into the atmosphere through the valve plate hole and the air outlet to achieve the purpose of dust collection and purification. As the process continues, the accumulated dust on the outside of the filter bag gradually increases, so that the running resistance of the dust collector also gradually increases. When the resistance increases to the preset value (1245-1470Pa), the dust cleaning controller generates a signal, First control the poppet valve to close the valve plate hole, cut off the filtered flue gas flow to stop the filtering process, then open the electromagnetic pulse valve to spray compressed air with a pressure of 0.5-0.7MPa in a very short time (0.1-0.15S). The box expands rapidly, and when it pours into the inside of the filter bag, the filter bag will be deformed and vibrated, coupled with the effect of reverse airflow, the dust outside the filter bag will be removed and fall into the ash hopper. After the dust is cleaned, the poppet valve will open again , the dust collector enters the filtering state again.

The above-mentioned working principle only shows the situation of one studio. In fact, the air box pulse dust collector is composed of multiple studios. When cleaning the dust, each studio is carried out sequentially. This process is the offline cleaning of the chambers. Its advantage is that the dust-cleaning room and the working room being filtered do not interfere with each other, realizing continuous operation and improving work efficiency. A room from the beginning to the end of the cleaning is called a cleaning process, and the cleaning process generally takes 3-10 seconds, from the cleaning of the first room to the beginning of the second room, called the cleaning interval. The length of the cleaning interval depends on the parameters of the flue gas, the size of the selection, etc., and it can be as short as tens of seconds, or as long as several minutes or even longer. The cleaning interval can be divided into centralized cleaning interval and uniform cleaning interval. two kinds. The so-called concentrated dust cleaning interval refers to the first room cleaning starts to the last room after the cleaning, all the rooms enter the filtering state until the next cleaning starts, and the uniform cleaning interval refers to the last room cleaning After the end, the dust cleaning of the first room is still started at the same interval, so the dust cleaning process of the uniform cleaning interval is continuous. The time interval from the start of the cleaning process in the first room to the start of the next cleaning process in the room is called the cleaning cycle, and the length of the cleaning cycle depends on the length of the cleaning interval.

The above cleaning actions are all automatically controlled by the cleaning controller. There are two kinds of cleaning controllers: timing control and constant pressure control. The structure of the dust collector is simple, and it is suitable for occasions where the working conditions are relatively stable; the constant pressure type is to set a pressure conversion switch inside the controller, and measure the running resistance of the dust collector through the pressure measuring hole on the dust collector. When the ash resistance occurs, the pressure switch will send a signal to start the ash removal controller for ash removal. This kind of ash cleaning controller can achieve the best match between the ash cleaning cycle and running resistance, so it is very suitable for occasions where the working conditions are unstable, but the instrument is more complicated and the price is more expensive.

Notice

1. The net filter area in the table is the filter area when a room is cleaned.

2. The air consumption in the table refers to the centralized air supply of the factory. If a separate air compressor is installed, the air consumption in the table must be multiplied by 1.3.

3. The processing air volume in the table is calculated based on the filtering wind speed of 1.2m/min, and is for user reference only.