It is difficult to treat a gas containing tar mist. However, if the oil mist in the gas is not large and the amount of dust is quite large, it can be directly filtered. For example, in an asphalt concrete plant, the flue gas of the stone dryer is mainly used, and the dust in the conveyor and other exhaust gases enters the equipment. The tar mist generated by the heated asphalt concrete also enters the equipment. In this case, the amount of dust accumulated on the filter cloth far exceeds the amount of oil mist, which prevents oil mist from sticking and ensures stable operation.
In the production of an electrode, a molded carbon product, or the like, a tar mist is also generated in the step of mixing the powder into the thermal binder. At this time, if dust is generated during the process of crushing and transportation, only a part of the tar mist can be used. However, if there is more tar in the coke drum flue gas on the tail tar furnace, an appropriate amount of coke powder should be added before the flue gas enters to absorb the coke, and satisfactory results can be obtained.
If the gas contains only a small amount of oil mist, it can be treated separately. That is, it is possible to use an appropriate amount of powder as a filter aid on the pipe. After the added dust absorbs the tar mist, it should be returned to the manufacturing process as much as possible.