Hot mix asphalt plant with catalytic reactor

Details Hot mix asphalt plant with catalytic reactor Hot mix asphalt plant with catalytic reactor

1994-09-22

1995-12-26

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

208 39, 422177, 422187, 4232391, 4232453, B01J 802, B01D 5000, B01D 5356, B01D 5386

Patent

active

054785308

ABSTRACT:
An HMA plant has a catalytic reactor which can effectively and reliably reduce VOC and NO.sub.x emissions produced during plant operation. The reactor effectiveness is enhanced by exhausting the gas stream from a primary dryer of the plant at a sufficiently high temperature for effective catalytic reaction. Since withdrawal of gases from the dryer at these elevated temperatures necessarily reduces the effectiveness of the dryer, overall plant efficiency is maintained by using the treated gas stream from the catalytic reactor to heat further the aggregate in a secondary dryer, which is preferably a finishing dryer/mixer such as a fixed sleeve dryer drum coater. Poisoning of the catalyst is avoided by removing at least a large portion of the dust in the gas stream via a high efficiency cyclone prior to introducing the gas stream into the catalytic reactor. Ammonia or urea may if desired also be injected into the gas stream prior to its introduction into the catalytic reactor.

REFERENCES:
patent: 4600379 (1986-07-01), Elliott
patent: 4867572 (1989-09-01), Brock et al.
patent: 4875436 (1989-10-01), Smith et al.
patent: 5322367 (1994-06-01), Nath et al.

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