Furnaces – Process
Patent
1991-01-31
1992-10-13
Yuen, Henry C.
Furnaces
Process
110222, 110346, F23B 700
Patent
active
051541289
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process for thermal salvage of waste materials containing organic components as well as a device for the thermal preparation of such waste.
The removal of waste materials containing organic components, such as domestic waste, industrial waste, etc., is at the present time as a rule performed by transport to waste dumps or through burning. The dumping of unsorted waste is very complex and may create new environmental burdens which may e.g. endanger ground water if the dumping grounds are not prepared properly. The establishment of new dumping grounds is also becoming more and more difficult because of permit laws. The dumping of trash or waste is also to a certain degree contrary to the legal stipulation of salvaging waste materials.
One possibility to avoid or reduce dumping problems is the thermal salvaging of waste materials to generate steam and electricity. In this context we already know of grate furnaces in which the waste materials are burned in the state they arrived in. In order to ensure continuous operation of these plants a larger-scale intermediate storage is inevitable if the waste is delivered discontinuously. This results in fermentation and decay processes and thus in odor developments offensive to the surrounding area.
In addition, because of e.g. the sometimes great fluctuations of the waste thermal value the combustion in such grate furnaces is as a rule rather inhomogeneous. This results in relatively high non-burned shares in the slag and fly-ash. This incomplete combustion results in odor problems even in the ash and such ash is in comparison with the ash of e.g. a hard coal power plant much harder to dispose of. Sometimes these ashes must be transported to removed special dumping grounds at high costs. Because of the incomplete combustion it can also not be excluded that highly toxic dioxines, e.g. polychlorinated dibenzodioxine or even polychlorinated dibenzofuranes may be generated if the waste materials contain organic or also inorganic chlorine compounds, e.g. polychlorinated biphenyls (PCB).
SUMMARY OF THE INVENTION
The invention has the task of providing a simple, economical and environmentally harmless process for the thermal salvaging of waste containing organic components. Another aspect is a device for the thermal processing of such waste.
The first task is solved according to the invention in that the waste is dried in direct heat exchange with hot exhaust gas of a coal-burning plant and that both the gas mixture resulting during the drying and the dry material from the waste are fed to the coal-burning plant.
The second task is solved according to the invention by a device which is characterized by a drier which contains a drying chamber and has chamber; the combustion zone of the power plant; and obtained in the drying chamber to the combustion zone of the power plant.
With the help of the invented measures it is possible to exploit the advantages of a coal-burning plant with an extraordinarily high combustion rate and correspondingly high combustion efficiency, such as they exist e.g. in steam generators of hard coal power plants with dry or liquid ash removal, also for the combustion of inhomogeneous waste. With the high combustion temperatures of a coal-burning plant which far exceed 1000.degree. C., environmentally compatible reaction products are even produced when relatively problematic wastes, such as plastics of all types as well as PCB-containing components, etc. are burned. The production of toxic dioxines or furanes is avoided from the start, or such compounds which are possibly produced as intermediate reaction products are safely broken down again at the high combustion temperatures.
The two fractions which are created because of the drying of the waste proposed here, i.e. the dry material and the gas mixture which contains combustible components may in contrast to untreated waste be burned without problems in a high-efficiency coal-burning plant with dry or liquid ash removal, e.g. in a hard coal p
REFERENCES:
patent: 2026366 (1935-12-01), Stehli
patent: 2213668 (1940-09-01), Dundas et al.
patent: 3670669 (1972-06-01), Hoad
patent: 4121524 (1978-10-01), Voelskow et al.
patent: 4133273 (1979-01-01), Glennon
patent: 4750437 (1988-06-01), Rouse
Strobach, "Energie aus Abfall", Organ Der Osterreichischen Gesellschaft Fur Natur-Und Umweltschutz, pp. 87-88 (Germany 1981).
Schlotmann, "Erste Erfahrungen mit der gemeinsamen . . . ", VGB Kraftwerkstechnik 57, pp. 552-558 (Germany 1977).
Wisely et al., "Use of Refuse as Fuel in an Existing Utility Boiler", 44:4, 38-41 (U.S.A. 1972).
Petzel Hans-Karl
Scholl Gerhard
Stadie Lothar
Creighton Wray James
Saarbergwerke Aktiengesellschaft
Siemens Aktiengesellschaft
Yuen Henry C.
LandOfFree
Process for salvaging waste and device for preparing said waste does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for salvaging waste and device for preparing said waste, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for salvaging waste and device for preparing said waste will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1293866