The plant's main emission control, a housing full of fabric filter bags that catch the dust carried out of the drum by exhaust gases before they reach the stack. Pulses of compressed air knock the dust cake off the bags into hoppers, and the collected fines are usually metered back into the mix or wasted. Baghouse temperature has to stay above the dew point to keep bags dry and below the fabric's limit, and returned fines affect VMA and dust ratio directly.
Baghouse temp's sitting at 230, if the RAP gets any wetter we'll be blinding bags by lunch.
Also heard as
- bag house
- dust collector
Related terms
Fines
The dust-sized part of the aggregate passing the No. 200 sieve, which stiffens the binder into a mastic.
Drum plant
A continuous asphalt plant that dries the aggregate and mixes it with binder in one rotating drum.
VMA
Voids in mineral aggregate: the space between aggregate particles available for binder and air.