Furnaces – Process – Incinerating refuse
Patent
1996-12-20
1998-06-09
Bennett, Henry A.
Furnaces
Process
Incinerating refuse
110224, 110229, 110238, 432 27, 432 28, 432215, F23G 500
Patent
active
057620105
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method for processing waste having a calorific value and any degree of humidity.
2. Discussion of Technology
The general process involved in this invention comprises a thermal treatment, wherein waste is put in a flow of hot, heat-resistant, heat-exchanging material which is warmer than 100.degree. C. The material cools due to heat exchange, the waste dries and the non-evaporated waste components are heated. The cooled, heat-exchanging material is subsequently separated from the dried waste material, and at least a part of the separated dried waste material is mixed with a percentage of the separated heat-exchanging material. The dried waste material and heat-exchanging material mixture is subsequently heated, and the dried waste material is pyrolyzed, resulting in its final burning. The heat-exchanging material is thus heated before further use in the thermal treatment.
More particularly, the invention relates to the processing of somewhat viscous waste containing organic material, including solids and/or liquids. For example, waste of animal origin, waste from slaughterhouses, sludge from the cellulose and paper industry, rancid oils, etc. or waste containing combustible mineral components may be processed using the method. The largest size of the solid waste particles is preferably smaller than 5 mm.
A method of the above-mentioned type is described in U.S. Pat. No. 4,248,164. According to this method, the fresh waste is dried using hot sand. The dried waste and the cooled sand are removed together from the drying installation and are separated. The separated dried waste is subjected to a pyrolysis, usually with the help of burners, in a combustion chamber. The separated sand is heated by the gases of the pyrolysis before being supplied to the drying installation. All of the sand which is used for the drying is recycled and supplied back to said drying installation at a temperature between 427.degree. and 649.degree. C. (800.degree.-1200.degree. F.).
When the hot sand makes contact with fresh, cold waste, the very great thermal shock causes the sand grains to burst. Because sand is used, the heat-exchange capability is limited. The high temperature in the drying installation limits the life of the drying installation unless it is made of special materials, which makes this process expensive.
GB-A-160,422 describes a method for drying material which needs to be ground in a revolving drum. The grinding elements (balls) from the drum are collected and are carried back into the drum via a tube in which they are heated by a furnace. However, the material is not waste and is not pyrolyzed after the drying.
The present invention aims to remedy said disadvantages and to provide a method for processing waste having a calorific value which has a high thermal efficiency and a maximum utilization of the processed waste. The present invention also aims to provide a method which is ecologically sound and can be realized with a relatively inexpensive device having a long life.
SUMMARY OF THE INVENTION
In reaching this aim according to the invention, a granulated material used as heat-exchanging material is heated. Fresh waste material is introduced into the flow of the heated granulated material, thereby drying the waste material. The dried waste material and granulated material are then separated. The dried waste material separated from the granulated material is mixed with only a part of the separated, cooled granulated material. This first mixture is pyrolyzed. The remaining part of the separated, cooled granulated material is mixed with the granulated material heated by the pyrolysis. This second mixture is used to dry fresh waste.
Preferably, the dried waste material and the granulated material are substantially separated from one another by collecting them separately after the drying.
Preferably, all the separated dried waste material is mixed with only a part of the separated granulated material.
In order to further diminish th
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Bennett Henry A.
Druwel Norbert
Groep Danis, naamloze vennootschap
Tinker Susanne C.
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