[특허]Low emission energy efficient 100 percent RAP capable asphalt plant

Terex USA, LLC

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특허 상세정보

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Low emission energy efficient 100 percent RAP capable asphalt plant

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B28C-005/46
미국특허분류(USC)	366/004; 366/007; 366/023
출원번호	US-0138204 (2008-06-12)
등록번호	US-8157431 (2012-04-17)
발명자 / 주소	Musil, Joseph E.
출원인 / 주소	Terex USA, LLC
대리인 / 주소	Simmons Perrine Moyer Bergman PLC
인용정보	피인용 횟수 : 1 인용 특허 : 12

초록

An HMA plant which uses combination direct exhaust heated and indirectly steam heated pre-heating drum in combination with a sealed indirect hot oil heated rotary shaft mixer, where the steam given off from the heated HMA is maintained, separated from the sulfur containing exhaust of a hot oil heater, so as to minimize the production of acid in liquid form.

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1. A method of mixing HMA comprising the steps of: providing a rotary drum pre-heater configured to move RAP in a first direction and to preheat said RAP to a temperature approaching, but not more than the boiling point of water inside of said rotary pre-heater;directing such pre-heated RAP to a rotary shaft mixer;using said rotary shaft mixer for providing direct heating of said pre-heated RAP to a temperature of approximately 600 degrees F.;providing an oil heater to heat oil and to provide the heated oil to movable portions of said rotary shaft mixer, so as to heat such movable portions and thereby indirectly heat HMA disposed within rotary shaft mixer;providing exhaust from an oil heater to an open central counter-flow heated gas passage within the rotary pre-heater;providing steam from the rotary shaft mixer to a steam void in the rotary pre-heater;maintaining separation of the steam and the exhaust of the oil heater until such time as the water vapor has condensed from the steam to a liquid state; andregulating the temperature and the amount of exhaust and steam provided to the rotary drum pre-heater, so that the steam in the steam void does cool sufficiently to condense to a liquid before being exhausted separate from the air exiting the rotary pre-heater. 2. The method of claim 1 wherein said rotary drum pre-heater is a counter flow rotary drum where hot gases flow in a second direction over said RAP as it moves through said rotary drum pre-heater in said first direction; and wherein said first direction is substantially opposite said second direction. 3. The method of claim 2 wherein said rotary drum pre-heater has a material input end and a material output end; and receives said steam from said rotary shaft mixer and said exhaust from oil heater both at said material output end. 4. The method of claim 3 wherein said rotary drum pre-heater is inclined upward from said material output end to said material input end. 5. The method of claim 1 further comprising a weighing cold feed conveyor and wherein said oil heater heats said oil to approximately 750 degrees F. 6. The method of claim 1 wherein said rotary drum pre-heater is constructed with a material and exhaust gas zone through which said RAP and said exhaust move in substantially opposite directions and a separate steam zone which receives said steam and allows said steam to indirectly pre-heat said RAP flowing from said material input end to said material output end and thereby allow for pre-heating of said RAP without introducing moisture therein from said steam. 7. The method of claim 6 wherein said rotary drum pre-heater is regulated with a weighing cold feed conveyor providing information for regulation which relates to the weight of the RAP and the rate of RAP entering said rotary drum pre-heater. 8. The method of claim 7 wherein said rotary drum pre-heater is coupled to a cyclone separator. 9. The method of claim 8 wherein said rotary drum pre-heater is coupled to a filter house. 10. The method of claim 9 wherein said rotary drum pre-heater is insulated exterior of an outside wall of said steam zone. 11. A system for mixing HMA comprising: a rotary drum pre-heater configured to move RAP in a first direction and to preheat said RAP to a temperature approaching, but not more than the boiling point of water inside of said rotary pre-heater; said rotary drum pre-heater configured for directing such pre-heated RAP to a rotary shaft mixer; rotary shaft mixer configured for providing direct heating of said pre-heated RAP to a temperature of approximately 600 degrees F.;an oil heater configured to heat oil to approximately 750 degrees F. and to provide the heated oil to movable portions of said rotary shaft mixer, so as to heat such movable portions and thereby indirectly heat HMA disposed within rotary shaft mixer;an exhaust pipe configured for providing exhaust from an oil heater to an open central counter-flow heated gas passage within the rotary pre-heater;a steam pipe configured for carrying steam from the rotary shaft mixer to a steam void in the rotary pre-heater;said rotary drum pre-heater configured for maintaining separation of the steam and the exhaust of the oil heater until such time as the water vapor has condensed from the steam to a liquid state; anda regulator for regulating the temperature and the amount of exhaust and steam provided to the rotary drum pre-heater, so that the steam in the steam void does cool sufficiently to condense to a liquid before being exhausted separate from the air exiting the rotary pre-heater. 12. The system of claim 11 wherein said rotary drum pre-heater is a counter flow rotary drum where hot gases flow in a second direction over said RAP as it moves through said rotary drum pre-heater in said first direction; and wherein said first direction is substantially opposite said second direction. 13. The system of claim 12 wherein said rotary drum pre-heater has a material input end and a material output end; and receives said steam from said rotary shaft mixer and said exhaust from oil heater both at said material output end. 14. The system of claim 13 wherein said rotary drum pre-heater is inclined upward from said material output end to said material input end. 15. The system of claim 11 further comprising a weighing cold feed conveyor. 16. The system of claim 11 wherein said rotary drum pre-heater is constructed with a material and exhaust gas zone through which said RAP and said exhaust move in substantially opposite directions and a separate steam zone which receives said steam and allows said steam to indirectly pre-heat said RAP flowing from said material input end to said material output end and thereby allow for pre-heating of said RAP without introducing moisture therein from said steam. 17. A system comprising; means for providing a rotary drum pre-heater configured to move RAP in a first direction and to preheat said RAP to a temperature approaching, but not more than the boiling point of water inside of said rotary pre-heater; directing such pre-heated RAP to a rotary shaft mixer;means for providing direct heating of said pre-heated RAP to a temperature of approximately 600 degrees F.;means for heating oil to approximately 750 degrees F. and to provide the heated oil to movable portions of said rotary shaft mixer, so as to heat such movable portions and thereby indirectly heat HMA disposed within rotary shaft mixer;means for providing exhaust from an oil heater to an open central counter-flow heated gas passage within the rotary pre-heater;means for providing steam from the rotary shaft mixer to a steam void in the rotary pre-heater;means for maintaining separation of the steam and the exhaust of the oil heater until such time as the water vapor has condensed from the steam to a liquid state; andmeans for regulating the temperature and the amount of exhaust and steam provided to the rotary drum pre-heater, so that the steam in the steam void does cool sufficiently to condense to a liquid before being exhausted separate from the air exiting the rotary pre-heater. 18. The system of claim 17 wherein said means for regulating the temperature and the amount of exhaust and steam comprises a weighing cold conveyor.

이 특허에 인용된 특허 (12)

이 특허를 인용한 특허 피인용횟수: 1

Musil, Joseph E.. Low emission energy efficient 100 percent RAP capable asphalt plant. USP2013118591092.

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Low emission energy efficient 100 percent RAP capable asphalt plant

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Low emission energy efficient 100 percent RAP capable asphalt plant

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