Counter-flow asphalt plant method

Details Counter-flow asphalt plant method Counter-flow asphalt plant method

2006-05-16

2006-05-16

Sorkin, David (Department: 1723)

Agitating

Mortar mixer type

Methods

C366S025000, C034S137000, C432S111000

Reexamination Certificate

active

07044630

ABSTRACT:
A method for operating a counter-flow aggregate dryer for an asphalt plant in which primary aggregate materials are introduced into a first end of a horizontally rotating cylinder and travel to the second, discharge end of the cylinder through drying and combustion zones. Hot gases are generated in the combustion zone to flow in counter-current heat exchange relationship with the aggregate materials for discharge from the first end of the cylinder to air pollution control equipment. Secondary materials like RAP or virgin aggregates are fed directly into the combustion zone. The discharge gas stream is heated above its dew point prior to delivery to air pollution control equipment.

REFERENCES:
patent: 4481039 (1984-11-01), Mendenhall
patent: 4787938 (1988-11-01), Hawkins
patent: 4955722 (1990-09-01), Marconnet
patent: 5470146 (1995-11-01), Hawkins
patent: 5664881 (1997-09-01), Hawkins et al.
patent: 5664882 (1997-09-01), Green et al.
patent: 6672751 (2004-01-01), Hawkins

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