[특허]Counter-flow drum mixer asphalt plant method for two stage mixing

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특허 상세정보

MyON담기

내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Counter-flow drum mixer asphalt plant method for two stage mixing

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B28C-005/46 B28C-005/00
미국특허분류(USC)	366/007; 366/023
출원번호	UP-0764727 (2007-06-18)
등록번호	US-7581871 (2009-09-16)
발명자 / 주소	Hawkins, Michael R
인용정보	피인용 횟수 : 2 인용 특허 : 34

초록
▼

A counter-flow drum mixer asphalt plant equipped with a secondary feeder for introducing RAP to direct radiant heat of the combustion zone. Heated virgin aggregate and RAP in the combustion zone are delivered through a transition piece to a first stage of the mixing zone where liquid asphalt is combined with the materials and secondary combustion air flows through the first stage to evacuate blue smoke and steam back to the combustion zone. The second stage of the mixing zone is substantially isolated from secondary combustion air flow where dust and mineral fines are introduced and mixed to complete the asphalt product discharged from the mixing zone. Alternative constructions of the mixing zone are disclosed to provide the first and second stages having such characteristics, as well as options for both the passive and active control of the secondary combustion air. An optional secondary burner in the exhaust housing elevates the temperature of the exhaust gas above its dew point temperature before delivery to the baghouse.

대표
청구항
▼

Having thus described my invention, I claim: 1. A method for producing asphaltic product from aggregate, RAP, and liquid asphalt, said method comprising the steps of: introducing aggregate material interiorly of a first end of an inclined, horizontal rotating drum to flow generally from said first end to the second end of said drum and to successively pass through drying, combustion and first and second stage mixing zones of said drum; generating a hot gas stream within the combustion zone of said drum to flow through the drying zone of said drum to said first end in countercurrent relation to said aggregate material; adding RAP material directly to the combustion zone of said rotating drum to combine therein with said aggregate material; delivering said heated and dried aggregate and RAP material to the first stage mixing zone of said rotating drum; mixing said aggregate and RAP material with liquid asphalt within the first stage mixing zone to form an asphaltic composition. 2. The method as in claim 1 further including: supplying an air flow to said first stage mixing zone to evacuate vapors therein to said combustion zone; isolating said second stage mixing zone substantially from said air flow; combining said asphaltic composition with fine additives in said second stage mixing zone to form a finished asphaltic product; and discharging said asphaltic product from said rotating drum. 3. The method as set forth in claim 2, said supplying step comprising supplying ambient, secondary combustion air flow to said first stage mixing zone to evacuate vapors therein to said combustion zone, and said isolating step comprising isolating said second stage mixing zone substantially from said secondary combustion air flow. 4. The method as set forth in claim 3, including the step of regulating said secondary combustion air flow to said first stage mixing zone to evacuate vapors therein to said combustion zone. 5. The method as set forth in claim 4, including the step of forcibly blowing a regulated flow of secondary combustion air to said first stage mixing zone. 6. The method as set forth in claim 1, including the step of heating said hot gas stream discharged from the first end of said cylinder to elevate the temperature of said discharged hot gas stream prior to delivery to air pollution control equipment. 7. The method as set forth in claim 6, including the steps of sensing the temperature of said discharged hot gas stream prior to delivery to air pollution control equipment and controlling said heating step to maintain said discharged hot gas stream prior to delivery to air pollution control equipment above its dew point temperature. 8. A method for producing asphaltic product from aggregate and liquid asphalt, said method comprising the steps of: introducing aggregate material interiorly of a first end of an inclined, horizontal rotating drum to flow generally from said first end to the second end of said drum and to successively pass through drying, combustion and first and second stage mixing zones of said drum; generating a hot gas stream within the combustion zone of said drum to flow through the drying zone of said drum to said first end in countercurrent relation to said aggregate material; delivering said heated and dried aggregate material to the first stage mixing zone of said rotating drum; mixing said aggregate material with liquid asphalt within the first stage mixing zone to form an asphaltic composition; supplying an air flow to said first stage mixing zone to evacuate vapors therein to said combustion zone; isolating said second stage mixing zone substantially from said air flow; combining said asphaltic composition with fine additives in said second stage mixing zone to form a finished asphaltic product; and discharging said asphaltic product from said rotating drum. 9. The method as set forth in claim 8, said supplying step comprising supplying ambient, secondary combustion air flow to said first stage mixing zone to evacuate vapors therein to said combustion zone, and said isolating step comprising isolating said second stage mixing zone substantially from said secondary combustion air flow. 10. The method as set forth in claim 9, including the step of regulating said secondary combustion air flow to said first stage mixing zone to evacuate vapors therein to said combustion zone. 11. The method as set forth in claim 10, including the step of forcibly blowing a regulated flow of secondary combustion air to said first stage mixing zone. 12. The method as set forth in claim 8, including the step of heating said hot gas stream discharged from the first end of said cylinder to elevate the temperature of said discharged hot gas stream prior to delivery to air pollution control equipment. 13. The method as set forth in claim 8, including the steps of sensing the temperature of said discharged hot gas stream prior to delivery to air pollution control equipment and controlling said heating step to maintain said discharged hot gas stream prior to delivery to air pollution control equipment above its dew point temperature.

이 특허에 인용된 특허 (34)

이 특허를 인용한 특허 (2)

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특허 상세정보

Counter-flow drum mixer asphalt plant method for two stage mixing

초록
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대표
청구항
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이 특허에 인용된 특허 (34)

이 특허를 인용한 특허 (2)

IPC 상위 출원인

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특허 상세정보

Counter-flow drum mixer asphalt plant method for two stage mixing

초록 ▼

대표청구항 ▼

이 특허에 인용된 특허 (34)

이 특허를 인용한 특허 (2)

IPC 상위 출원인

과제정보

상세정보조회

원문조회

IPC 상세정보(version : 201201)

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