Dust Cleaning Principle of Extraction Thimble

Usually, the extraction thimble is cleaned by air-artery flushing and back-blowing system, which consists of the airbag, electromagnetic pulse valve, PLC controller, and compressed air. One end of the pulse valve is connected to a compressed air storage tank, and the other end is connected to the injection device.

An exhaust valve is installed on the valve cover, and the exhaust valve is controlled by a PLC pulse controller. When no signal is sent out by the PLC controller, the movable baffle of the exhaust valve is in the position of the closed exhaust hole.

When the program controller sends out the signal, the movable baffle opens and the compressed air of the storage tank quickly relieves pressure, so the corrugated film inside the exhaust valve is pressed in the opposite direction, the jet opens, and the compressed air enters the filter through the pulse valve. The cylinder is sprayed to clean the ash.

Every time the soot cleaning is completed at about 0.1-0.3S, it is the high-pressure air ejected at this instant that has a good effect on soot cleaning. Pulse injection pressure is 0.4-0.6 MPa, and a constant gas supply must be maintained in operation.