US4705404A
Expired / Lapsed
US
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Method and apparatus for processing mixed asphalt material utilizing broken-up used asphalt
Assignee: Deutsche Asphalt GmbH
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Filing: 1985-10-31
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Granted: 1987-11-10
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Expires: 2005-10-31
Abstract
Abstract A method as well as an apparatus for processing asphalt mixtures is provided in which broken-up used asphalt is employed and new material is added, utilizing a plurality of burner-heated drum devices, with the used asphalt component and the new material for the asphalt mixture to be processed or produced being processed, i.e. heated in particular, in respectively differently configured drum devices. The used asphalt component is heated separately in a drum mixer operated with parallel flow and the new material component is heated in a drying drum operated with counterflow. After leaving their respective drum devices, the components are conducted into at least one further connected mixer and are further treated there with fresh bitumen and possibly with filler material being added in the mixer. Furthermore, the exhaust gases of the drum mixer are introduced directly into the drying drum and are further heated there, thus combusting the CH x and CO component contained therein. In this process, the exhaust gases of the drum mixer are introduced into the interior of the drying drum in the immediate vicinity of the burner flame through flow channels in the form of nozzles via a feed device formed at the frontal face of the drying drum in which the burner is disposed, with the direction of the nozzles being adjustable as a function of the size of the burner flame.
Inventors
- 👤 Horst Bruggemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:55
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/02; E01C19/10; E01C19/1004; E01C19/1013; E01C19/1027; E01C19/1036; E01C19/105; E01C19/1059; E01C19/1063; E01C2019/1081; E01C2019/109; E01C2019/1095
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
150 words
In a method for processing mixed asphalt material utilizing broken-up used asphalt and new material utilizing a plurality of burner-heated drums, comprising heating used asphalt in a parallel-flow drum mixer under conditions substantially avoiding damage to the used asphalt, and heating the new material to a temperature higher than the temperature of the asphalt in a counter-flow drying drum, mixing the used asphalt and the new material in a connected mixer while adding bitumen and filler to obtain an asphalt mixture, the improvement comprising introducing exhaust gases comprising CH x and CO from the parallel-flow drum mixer directly into the drying drum; heating the gases to a temperature sufficient to allow the combustion or decomposition of CH x and CO in the drying drum; and allowing for the heating gases to further heat the new material in the drying drum to a temperature higher than that of the used asphalt.
Claim 2
Dependent Claim
150 words
In a method for processing mixed asphalt material utilizing broken-up used asphalt and new material utilizing a plurality of burner-heated drums, comprising heating used asphalt in a parallel-flow drum mixer under conditions substantially avoiding damage to the used asphalt, and heating the new material to a temperature higher than the temperature of the asphalt in a counter-flow drying drum, mixing the used asphalt and the new material in a connected mixer while adding bitumen and filler to obtain an asphalt mixture, the improvement comprising introducing exhaust gases comprising CH x and CO from the parallel-flow drum mixer directly into the drying drum; heating the gases to a temperature sufficient to allow the combustion or decomposition of CH x and CO in the drying drum; and allowing for the heating gases to further heat the new material in the drying drum to a temperature higher than that of the used asphalt.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the gases in the drying drum are heated with a flame.
Claim 4
Dependent Claim
30 words
The method of claim 2, wherein the exhaust gases exiting from the parallel-flow drum are fed into the interior of the drying drum in the immediate vicinity of the flame.
Claim 5
Dependent Claim
20 words
The method of claim 3, where the exhaust gases exiting from the parallel-flow drum are conducted directly into the flame.
Claim 6
Dependent Claim
20 words
The method of claim 3, wherein the exhaust gases exiting from the parallel-flow drum are passed directly by the flame.
Claim 7
Dependent Claim
29 words
The method of claim 3, wherein the exhaust gases exiting from the parallel-flow drum are conducted around the flame in the form of at least a partial jacket stream.
Claim 8
Dependent Claim
40 words
The method of claim 1, wherein the used asphalt is heating in the parallel-flow drum up to about 170° C.; and the new material is heated in the drying drum to a temperature between about 180° C. and 350° C.
Claim 9
Dependent Claim
20 words
The method of claim 1, wherein the mixing ratio of the used asphalt to the new material is adjustabley regulatable.
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein the amount of used asphalt component is in a considerable majority of the asphalt mixture.
Claim 11
Dependent Claim
20 words
The method of claim 1, further comprising heating the asphalt mixture in the connected mixer to maintain a desired temperature.
Claim 12
Dependent Claim
19 words
The method of claim 1, wherein the ratio of bitumen and filler added into the mixer is adjustaby regulatable.
Claim 13
Dependent Claim
26 words
The method of claim 1, further comprising mixing the asphalt mixture exiting from the connected mixer in a further mixer in communication with said connected mixer.
Claim 14
Dependent Claim
160 words
In an apparatus for processing asphalt material utilizing broken-up used asphalt and adding new material, comprising first and second parallel drum devices, wherein said first device is a parallel-flow mixer for processing the used asphalt, and said second device is a counter-current drying drum for processing the new material; said first and second devices having material discharge points and said second device having a frontal face provided with apertures and a burner; at least one mixer; means for transferring exhaust gas containing CH x and CO connected said first and said second devices; means connecting the material discharge points of said first and second devices with said at least one mixer; the improvement wherein said means for transferring is connected to said first device at the material discharge point and ends in the form of a feed channel in the frontal face of the second device, said channel being connected through the apertures to the inside of the second device.
Claim 15
Dependent Claim
160 words
In an apparatus for processing asphalt material utilizing broken-up used asphalt and adding new material, comprising first and second parallel drum devices, wherein said first device is a parallel-flow mixer for processing the used asphalt, and said second device is a counter-current drying drum for processing the new material; said first and second devices having material discharge points and said second device having a frontal face provided with apertures and a burner; at least one mixer; means for transferring exhaust gas containing CH x and CO connected said first and said second devices; means connecting the material discharge points of said first and second devices with said at least one mixer; the improvement wherein said means for transferring is connected to said first device at the material discharge point and ends in the form of a feed channel in the frontal face of the second device, said channel being connected through the apertures to the inside of the second device.
Claim 16
Dependent Claim
15 words
The apparatus of claim 13, wherein the at least one mixer is a heatable mixer.
Claim 17
Dependent Claim
15 words
The apparatus of claim 13, wherein the apertures of the second devices are flow channels.
Claim 18
Dependent Claim
11 words
The apparatus of claim 15, wherein the flow channels are nozzles.
Claim 19
Dependent Claim
16 words
The apparatus of claim 15, wherein the flow channels concentrically surround the aperture of the burner.
Claim 20
Dependent Claim
28 words
The apparatus of claim 15, wherein the direction of flow of the channels can be varied as a function of the direction of a flame in the burner.
Claim 21
Dependent Claim
14 words
The apparatus of claim 18, wherein all flow channels are coupled with one another.
Claim 22
Dependent Claim
13 words
The apparatus of claim 19, wherein all flow channels are controlled in synchronism.
Claim 23
Dependent Claim
18 words
The apparatus of claim 20, wherein the flow channels can be adjusted as a function of flame size.
Claim 24
Dependent Claim
30 words
The apparatus of claim 13, further comprising one other mixer connected to said at least one mixer, said one mixer and said one other mixer being double-shaft positive-flow flow-through mixers.
Claim 25
Dependent Claim
14 words
The apparatus of claim 22, wherein the one other mixer is a heatable mixer.
Claim 26
Dependent Claim
22 words
The apparatus of claim 22, further comprising means for feeding bitumen and filler to said one mixer and said one other mixer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |