Stoves and furnaces – Melting furnaces
Patent
1984-03-05
1987-02-24
Favors, Edward G.
Stoves and furnaces
Melting furnaces
208 39, 432 98, E01C 1945, F24H 100
Patent
active
046449329
DESCRIPTION:
BRIEF SUMMARY
The invention is a method and a device for energy recovery during manufacture of asphalt in bulk.
Today smoke gasses from the manufacturing of asphalt in bulk normally are cleaned by scrubbers or bag filters. Both systems have disadvantages which negatively influence the processes, both operationally and economically.
In known scrubbers the pollutants of the gases are absorbed by a liquid, usually water. This process includes a high energy consumption and also is dependent on water supply. A high amount of condensation from the oil products creates problems with clogging of jets which in turn causes disturbances in the system. In addition, sulphur deposits also create difficulties. For these reasons, use of scrubbers demands a considerable amount of energy and maintenance work.
Bag filters, on the other hand, have a considerable limitation in that the cloth is destroyed at temperatures exceeding about 230.degree. C. Furthermore the compositions of bitumen will condense and pack the clock in the bag filters.
By means of the features mentioned in the characterizing clause of the claims, these unfortunate results of the prior art are overcome. In addition, a considerable energy recovery is achieved in that the heat energy of the smoke gases is used for preheating the bulk before it is supplied to the drying and mixing process.
In the drawing,
FIG. 1 discloses schematically a total plant for manufacturing asphalt in bulk and
FIG. 2 discloses a vertical section through the device according to the invention.
FIG. 1 discloses a total plant for manufacturing asphalt in bulk according to the invention. Two bulk fractions are supplied through feeding pockets 24, whereas filler is supplied from a silo 25 to a conveyor 28 which transports the bulk to the device according to the invention. The drawing discloses also bitumen tanks 22, an oil tank 23, doser device 27 for recirculation and a conveyor 26 for withdrawal of the end product.
The waste gases from the mixing drum 29 are directed by channels 30 to the device 21. After treatment in the device, the bulk is transported by a transport means 31 to the input of the mixing drum 29.
The device 21 is disclosed in vertical section on FIG. 2. The conveyor 28 transports the bulk to the elongated funnel 6 where the bulk is distributed equally along the length of the funnel by a scraper conveyor 8. In the lowest part of the funnel 6 a packing of bulk, generally denoted 11, is created. This packing or plug prevents air in the environment from penetrating into the device 21. A cam 12 divides the bulk in the funnel into branches for treatment in symmetrically arranged sets of inclined planes.
Each inclined plane comprises a lower inclined wall 1 and an upper inclined wall plan 5 being arranged in parallel and at a distance from each other. In one embodiment, the free distance between the walls is 200 mm and the sloping angle is 14.degree. to the vertical. Each inclined wall 1, 5 comprises a grating 3, 13 to which horizontally fixed ribs 2, 4 are arranged. The ribs 2 in the first wall 1 are arranged sloping downwards against the second wall 5, the ribs thereby partly overlapping each other. The ribs 4 in the wall inclined plane 5 are arranged vertically.
The combustion gasses supplied to the device from the mixing drum 29 by channels 30, are supplied to the lower side of the first inclined wall 1 and pressed through the ribs 2 against the bulk masses sliding down the inclined plane from the funnel 6. The gasses disperse a substantial part of their heat energy to the bulk masses and simultaneously are cleaned of pollutants. The gasses are then sucked up through the ribs 4 in the second inclined wall 5 and further directed to the environment.
To cause the bulk masses to move downwards between the inclined walls, vibrator devices 14 are used to vibrate the inclined planes. Further, to prevent the bulk masses from packing or compressing, the lower edge of the ribs 2 are provided with teeth comprising alternating recesses and webs, the webs in a rib being arranged above the recesses i
REFERENCES:
patent: 3144864 (1964-08-01), Heijnis
patent: 3554449 (1971-01-01), Currie
patent: 3577976 (1971-05-01), Heller
patent: 3604693 (1971-09-01), Groepler et al.
patent: 4161391 (1979-07-01), Parker
patent: 4477250 (1984-10-01), Brashears et al.
Ameco A/S
Favors Edward G.
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