The extraction thimbles is a surface filter element. It uses the tiny air-permeable tissue formed on the surface of the filter material to block the particulate matter in the gas.
Hawach extraction thimbles are a commonly used dust catching device, which has the characteristics of high capture rate, low resistance and easy sampling in the flue. According to the material that can be divided into two kinds of glass fiber filter cartridges and corundum filter cartridges, the most widely used daily is glass fiber filter cartridges. The glass fiber filter cartridge is made of ultra-fine glass fiber, and the collection rate of dust particles above 0.5 μm can reach more than 99.9%.
The automatic dust cleaning methods commonly used in extraction thimbles include high-pressure gas pulse backflush and mechanical vibration. Pulse backflushing uses a preset parameter of the controller to give a signal to the solenoid valve, instantly opens and closes the solenoid valve diaphragm, so that the high-pressure gas enters the blowing pipe, and uses the rapid expansion force of the gas to shake off the dust on the surface of the filter cartridge. General gas pressure We set it to about 6 kg. Mechanical vibration dust removal is often used in small single-machine extraction thimbles dust collectors. It uses the shaking force generated by the eccentric device on the dust collector flower plate to remove dust. This action requires operation after shutdown.
Extraction Thimbles dust collectors have appeared in Japan and some European and American countries as early as the 1970s. They have the advantages of small size, high efficiency, low investment, and easy maintenance. However, due to their small equipment capacity, it is difficult to combine them into large air volume equipment. The filtering wind speed is relatively low and the application range is narrow.
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