Dust removal principle bag filter
The working principle of the dust collector is: the dusty gas enters the filter chamber through the lower opening flange, and the coarse particles directly fall into the ash bin; the dusty gas is filtered by the filter bag, and the dust remains on the bag surface; the clean gas passes through the bag mouth to the clean room and is discharged into the atmosphere by the fan. When the dust on the surface of the filter bag is increasing, the programmable controller starts to work, and the pulse valves are opened one by one, so that compressed air is blown to the filter bag through the nozzle to clean the dust, and the filter bag suddenly expands. Under the action of reverse airflow, the dust given to the bag surface quickly leaves the filter bag and falls into the ash bin, and the dust is discharged by the ash discharge valve.
pulse dust collector
The dust collector is mainly composed of an upper box, a middle box, an ash hopper, an air inlet equalizing pipe, a supporting filter bag, a blowing device and an ash discharging device. Dust-containing gas enters the ash hopper of each room from the air inlet equalizing pipe of the dust collector. Under the shunt of the ash hopper shunt device, large particles of dust are separated and directly fall into the ash hopper, while finer dust evenly enters the middle box and is adsorbed on the outer surface of the filter bag. Clean gas enters the upper box through the filter bag and is discharged into the atmosphere through various off-line valves and exhaust pipes. With the progress of filtration, the dust on the filter bag accumulates more and more. When the equipment resistance reaches the limit resistance value (generally set to 1500Pa), the dust removal control device will automatically close the off-line valve of one room according to the set value of pressure difference or the set value of dust removal time, then open the electric pulse valve according to the set procedure to stop blowing, and use compressed air to blow instantly to increase the pressure in the filter bag, so that the dust on the filter bag can be shaken off (even if there is fine dust).
cyclone scrubber
The working principle of cyclone dust collector with bypass is that dust-containing gas enters tangentially from the inlet, and at the same time, the airflow gets rotary motion, and the airflow is separated up and down to form double spiral volute motion. Dust has a strong separation effect at the boundary of double spiral volute, and coarse dust particles are separated to the outer wall with the downward spiral volute airflow, some of which are led out from the hole in the middle of the bypass separation chamber, and the rest are brought to the ash hopper by the downward airflow. The upward spiral vortex airflow can gather fine dust, thus improving the dust removal efficiency. This part of fine dust particles is carried upward by the rising spiral vortex airflow, forming a strongly rotating upper dust ring under the top cover, entering the upper hole of the bypass separation chamber together with the rising spiral vortex airflow, and being introduced into the cone through the air return port to join with the internal airflow. The purified gas is discharged from the exhaust pipe, and the separated dust enters the hopper.
Electrostatic precipitator
After the dust-containing gas enters the equipment from the air inlet at the top of the equipment, it passes through the cyclone separator at high speed, so that the dust-containing gas rotates downward along the axial adjusting screw, and the coarse particles of dust are removed by centrifugal force, effectively controlling the initial dust concentration entering the electric field. Then, the gas enters the electric field through the lower ash hopper to do work. Because the cross-sectional area of the lower ash hopper is several times larger than that of the inner pipe, according to the principle of constant rotating torque, the radial wind speed and axial wind speed drop sharply to produce a zero-speed interface, which makes the heavy particle dust in the inner pipe settle in the lower ash hopper, thus reducing the dust concentration entering the electric field. Low-concentration dust-containing gas condenses on the anode plate and cathode plate by electrostatic precipitation, and the collected dust is transported away by dust locking device through dust cleaning and vibration. In order to prevent the secondary dust from being generated in the lower ash hopper after the cyclone of the inner tube and the vibration of the electric field plate, an isolation cone is specially set in the lower ash hopper.
Scope of use: various mills in cement, fertilizer and other industries, feed inlets of crushing points, packaging machines and dryers, and various similar dispersed sources.
Filter cartridge dust collector
Under the action of the main fan of the system, the dusty gas enters the gas box at the bottom of the dust collector from the air inlet at the lower part of the dust collector for pretreatment, and then enters each dust removal chamber of the upper box from the bottom; Dust is adsorbed on the outer surface of the filter cartridge, and the filtered clean gas enters the clean air cavity of the upper box through the filter cartridge and is collected and discharged at the air outlet.
With the continuous filtration conditions, the dust accumulated on the outer surface of the filter cartridge will accumulate more and more, which will increase the running resistance of the equipment accordingly. In order to ensure the normal operation of the system, the upper resistance limit of the dust collector should be maintained in the range of 1400 ~ 1600 Pa. When it exceeds this limited range, the PLC pulse automatic controller will issue instructions through constant resistance or timing to carry out three-state dust removal.
The cleaning process of the filter cartridge dust collector is to cut off the clean gas outlet channel of a room, so that the room is in a static state of airflow, then carry out compressed air pulse back blowing to clean the dust, and then open the clean gas outlet channel of the room after a few seconds of natural sedimentation, which not only thoroughly cleans the dust, but also avoids the secondary adsorption of the dust generated by blowing the dust, so that the dust can be recycled from one room to another.
Single dust collector
Dust-containing gas enters the box and is filtered by flat bag filter, and dust remains on the outer surface of the filter bag. The purified gas enters the fan through the filter bag and is directly discharged by the fan. With the increase of filtration time, the dust attached to the outside of the filter bag increases, and the resistance of the filter bag also increases accordingly, thus affecting the dust removal efficiency. At this time, the vibration mechanism is started to shake off the dust attached to the surface of the filter bag, and the dust falling in the drawer is removed by manual pulling.
Working principle of a single dust collector:
Dust-containing gas enters the box from the air inlet and is filtered by the filter bag, and the dust remains on the outer surface of the filter bag. The purified gas is discharged from the box body through the air outlet by the fan and directly discharged indoors (or discharged outdoors through the air duct).
With the continuous operation of the main engine, more and more dust is attached to the outside of the filter bag, which makes the resistance of the equipment rise continuously. Therefore, it is necessary to clean the dust, so that the dust attached to the outside of the filter bag can be shaken off, and then fall into the dust collector (drawer) through the ash hopper and be removed manually.