As an alternative to electric filters are used in industrial applications, bag filter. These are filters, which stabilized with a variety of wire baskets by individual filter bags are fitted. The filter bags hang down vertically, on its cylindrical outer surface of the dust accumulates and forms a filter cake. These filters (pressure controlled by monitoring the pressure difference, that is) either according to their degree of contamination or after a certain time (scheduled) are cleaned by a short pulse of compressed air is introduced against the flow direction in the filter bags (“pulse-jet cleaning) or under the direction of flow in the filter system is reversed (“reverse air cleaning). This causes the filter cake is discharged from the tubes and the filter material permeable again for a long time. The filter bags are subject to wear, their life is sufficient, depending on the process and the used filter material from a few days to more than ten years. In general, the filter bags during this period, tens-cleaned to a hundred thousand times. The falling of the filter bags dust is collected in hoppers and disposed of tube feeders or screw conveyors, and then removed from the system or the following processes (eg combustion, cement production) are added. Other kind is car air filter provided by car id.
The so-called STEAG-stones, with a similar appearance to the sand-lime bricks are too high proportions caked with cement fly ash from power plants and heating plants. Manufacturer of very large industrial bag filter systems of this type include intensive Filter GmbH & Co. in Velbert or Standard Filter Corporation, Carlsbad, California.
The trunk can be used in addition to the transportation of luggage for many other purposes such as to accommodate a spare wheel, an auxiliary or gas tanks with gas-powered vehicles, car stereo, or it can be mounted another row of seats (for vans).
