Furnaces – Process – Incinerating refuse
Patent
1991-12-05
1993-11-30
Favors, Edward G.
Furnaces
Process
Incinerating refuse
110219, 110222, 110223, 110246, F23G 500
Patent
active
052655458
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus methods of waste treatment.
This invention has particular but not exclusive application to apparatus and methods for the incinerative processing of waste with organic content, and for illustrative purposes reference will be made to such application However, it is to be understood that this invention could be used in other applications, such as the incinerative processing of waste other than organic material containing waste.
The exercise of industry has, as its inevitable consequence, the ongoing problem of disposal of the often toxic wastes produced thereby. Such waste may take any form from sub-micron particulates to liquids and gases and may contain substances of extreme human or environmental toxicity such as toxic metals, synthetic organic compounds and unnatural concentrations of normally innocuous substances such as hydrocarbons, refuse and sewage. Where the actual toxicity of industrial waste is not a significant factor in its disposal, treatment methods used in the past have presented a treated product that is of itself difficult to dispose of, either from an aesthetic point of view or from the point of view of the mass of treated material to be disposed of.
Highly toxic wastes of the organic type such as poly chlorinated aromatic hydrocarbons such as PCB's are presently disposed of by high temperature incineration Often, the waste must be transported overseas to be destroyed either at foreign specialized facilities or at sea. Foreign treatment is extremely expensive, a cost which is added to the cost of manufactures at home The establishment of cost effective facilities is only economic where very large quantities are to be treated since economic operation of such a high energy consumption process are only obtainable with scale. Disposal at sea, unrestrained by but nominally subject to International Laws, has resulted in dumping when economically expedient. Where incineration actually takes place, it is at reduced standards of emission control in terms of both the flue gases generated and the residue dumped.
Other less toxic wastes are disposed of by less intensive and more cost effective treatments such as by cementation and burial or dumping of the solid waste product. This method of disposal presents the problem of the disposal of the liquid supernatant of the cementation process as well as the disposal of an increased volume of often leachable solid material. Sewage waste solids are generally even more simply disposed of by settling and evaporation of primary treatment slurries followed by open-site dumping of the partially dewatered sludge. Although the level of toxicity of the bulk waste is generally low, such treatment may concentrate toxic elements and substances in the solids dumped, resulting in the potential of leaching of toxic liquors into aquifers and watercourses.
Where hydrocarbon based waste such as condemned fuel and waste lubricants is to be destroyed, this has generally been by incineration. However, the energy values of such waste are generally wasted since water contamination of the waste prevents its use as incinerator fuel for treatment of other high-solids waste as the contaminating water normally causes blockage of standard burner jets
Accordingly it is an object of the present invention to provide an apparatus and method for treating a broad variety of waste, which apparatus and which will alleviate the deficiencies of the prior art and are reliable, economical and efficient in use. Other objects and advantages of this invention will hereinafter become apparent
With the foregoing and other objects in view, this invention in one aspect resides broadly in a method of waste treatment including mixing waste material with binder, pelletizing the mixture and firing the mixture in a furnace at a temperature above 1300 degrees celsius.
It has been found that heating the waste pellets to a temperature above 1300 degrees celsius, provides a product clinker having reduced leachability and increased chemical and physical stability. The flue gases
REFERENCES:
patent: 4133273 (1979-01-01), Glennon
patent: 4640203 (1987-02-01), Wolter et al.
patent: 4870912 (1989-10-01), Lee
patent: 4890563 (1990-01-01), White et al.
Favors Edward G.
Miltox Holdings Pte, Limited
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