Air Pollution Control for a Hot Mix Asphalt Plant

the emission collection system (Hot Mix Asphalt Plants, 2000). In a counter-flow drum mixer, counter-flow means the material flows into the drum from the opposite direction as the exhaust gases. The mixing process is also different. The liquid asphalt cement mixing zone is located behind the burner flame zone.

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Tight asphalt market | Roads & Bridges

Feb 05, 2001 · The Triple-Drum counter flow asphalt production plant from CMI Corp., Oklahoma City, Okla., combines three distinct drying and heating zones in a single drum, resulting in higher production capacities for virgin and high-ratio RAP mixes. The variable-length combustion zone permits easy switching from one mix or production rate to another.

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The UF Series Drum Mixer — ALmix - Asphalt Equipment Company

The ALmix UF-Series Counter Flow Drum Mixer | Overview. The UF-Series Counterflow Drum Mixer is the flagship product from ALmix. Designed for asphalt producers seeking the most efficient, mechanically sound, aesthetically pleasing and adaptable asphalt plant the market has to offer.

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Construction of Quality Hot Mix Asphalt Pavements - 1 Day

Feed Hot Mix Asphalt Mixing Counter-Flow Drum-mixer Zones Air AC Hot Mix Asphalt Aggregate Mixing Combustion Heating Drying Captures)Dust)From)Plant)&)Silo) Evacuates Gases&Steam Provides)Air) forCombuson) Exhaust)Fan) Emission Control Equipment Insufficient Drying • Trapped moisture • Poor asphalt - aggregate bond • Tender mixes

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Parallel-Flow Drum-Mix Plants

parallel-flow. First, many plants are equipped with a burner that requires from 30 to 45 percent of the air needed for combustion to be forced through the burner by a blower on the burner itself. The remaining 70 to 55 percent of the combustion air is pulled by the exhaust fan on the plant into the combustion zone around the burner.

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Patents Assigned to Maxam Equipment, Inc. - Justia Patents

Feb 28, 2015 · Counter-flow asphalt plant with multi-stage combustion zone overlapping the mixing zone Patent number: 5664881 Abstract: A drum mixer is provided with a rotatable cylinder in which aggregates, reclaimed asphalt pavement and liquid asphalt are …

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| AsphaltPro Magazine | 9 Tips for Asphalt Plant Maintenance

The shell temperature of an uninsulated counter-flow dryer will range anywhere from less than 300⁰F at the ends (virgin aggregate feed breeching, and mix discharge to the finished product, or slat, conveyor) to perhaps more than 600⁰F in proximity to the combustion zone.

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CFM Series Counterflow Dryer / Drum Mixer - Aesco Madsen

Mixing Zone. Lastly, the virgin material travels behind the burner flame into the mixing zone where liquid asphalt, RAP (recycled asphalt pavement), fines, and additives are blended into the mix via mixing flights. It is in this mixing chamber that the benefits of counterflow technology are truly realized.

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Counter-flow asphalt plant with multi-stage combustion

The above noted counter-flow systems, that are able to combine RAP, liquid asphalt, fines and aggregate, use mixing, combustion, and heating/drying zones arranged end-to-end along the length of the drum mixer, thereby requiring an extremely long and specially designed drum cylinder.

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New Tech, Services Keep up with Asphalt Production Trends

Even with low combustion in today's modern asphalt plants, companies offer lo-NOx burners to drive scant emissions down further. Even though those burners aren't mandatory in all areas, thus lo-NOx burners are usually an option when you're looking at new equipment, OEMs make them available to anyone who is interested.

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Hot Mix Asphalt Mixing Facilities

combustion zone . as . possible, but with enough drum length remaining to adequately . dry . and heat the material prior to reaching the coating zone. The amount of . virgin . aggregates and virgin asphalt cement fed to the process are adjusted according to the amount of . RAP . used and the condition of . the . asphalt cement in the . RAP

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CFM Series Counterflow Dryer / Drum Mixer - Aesco Madsen

Mixing Zone. Lastly, the virgin material travels behind the burner flame into the mixing zone where liquid asphalt, RAP (recycled asphalt pavement), fines, and additives are blended into the mix via mixing flights. It is in this mixing chamber that the benefits of counterflow technology are truly realized.

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the ultraplant - Gencor

The material process flow starts at the virgin aggregate feed end of the Ultradrum where aggregates are quickly heated to temperature as they approach the burner. While the aggregates approach the combustion zone, the recycled asphalt (having previously been reduced in size) is introduced into the combustion zone, behind the

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US7044630B1 - Counter-flow asphalt plant method - Google

More specifically, this invention relates to a counter-flow asphalt plant having a recycle asphalt (RAP) feed to the combustion zone to produce high percentage RAP mixes without generating excessive blue smoke and having an exhaust gas heater to improve production rates with greater economy and efficiency of plant design and operation.

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Emission Estimation Technique Manual

Figure 2 - Basic Process Steps for Drum Mix Asphalt Plants Source: Queensland Department of Environment and Heritage, 1998. 2.3 Counter Flow Drum Mixing Process In the counter flow drum mixing process, the aggregate is proportioned through a cold feed system prior to introduction to the drying process. As opposed to the parallel flow

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USE OF HYDROGEN FROM RENEWABLE ENERGY SOURCE …

Mar 20, 2012 · the counter-flow design (Fig. 4). In parallel-flow drum mix plants, the sized aggregate enter the dryer drum at the burner end, the aggregate and air flow move in the same direction (along with the combustion products) and the HMA is discharged at the opposite end. In the counter-flow drum, the burner is located near the HMA

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Batch Mix Plants — ALmix - Asphalt Equipment Company

ALmix's Travel Pack range of fully mobile asphalt mixing plants feature a production capcity ranging from 50 - 250 TPH. It is ideal for job sites requiring 2,000 - 200,000 tons of hot mix asphalt. The Travel Pack comprises of essential equipment that may be configured into Mobile Batch Mix Plants or Mobile Continuous Mix Plants as per the

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US20020131321A1 - Counter-flow asphalt plant with

Further, none of the conventional counter-flow systems are readily incorporated into existing counter-flow batch-plant dryers. Briefly, a batch-plant dryer includes a cylindrical mixer drum receiving aggregate at an inlet end and producing a hot gas stream at a discharge end.

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Plants & Plant Equipment: Terex E225P | For Construction Pros

Oct 01, 2005 · The base plant includes the necessary electronic connections to accept recycled asphalt, and its counter-flow technology enables the E225P drum to run higher percentages of RAP than parallel-flow

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Counter-flow asphalt plant with combustion zone feed and

US6672751B2 - Counter-flow asphalt plant with combustion zone feed and exhaust gas heater - Google Patents. A counter-flow aggregate dryer for an asphalt plant is equipped with a secondary feeder

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