Furnaces – With control means responsive to a sensed condition – Feed control
Patent
1994-09-12
1996-05-21
Bennett, Henry A.
Furnaces
With control means responsive to a sensed condition
Feed control
110227, 110222, 110293, F23N 502
Patent
active
055179290
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for thermal treating loose materials, such as, for example, earth, sand, sewage sludge, gravel and the like.
Such a device can be used in the horticulture industry, for example, for sterilising plant earth. The earth used for growing plants is contaminated after use due to microorganisms, fungus, etc. This contamination impairs the growth of the plants and, therefore, must be removed before the earth can be used again.
Against this problem, the horticulture industry normally uses a steaming apparatus having a sealable steaming chamber with a capacity for, for example, 2 m.sup.3 earth. Hot steam, generated by a separate steam producer, is introduced into this steam chamber in which the earth is heated up and the microorganisms, etc, are killed. The steaming operation requires around two hours.
This known apparatus has the disadvantage that in order to work reasonably economically, a large steaming chamber is necessary which means a large and heavy construction. Furthermore, despite its large dimension, the possible throughput is relatively low.
It has, therefore, been suggested in DE-OS-2,349,878, to replace the steaming chamber of the above described apparatus with a conveyor belt comprising plate-like conveyor shovels extending in the transverse direction which together with the conveyor belt and a covering, forms respective individual steaming chambers. Steam is produced by a separate steam generator which is introduced into these steam chambers.
This apparatus has, however, the disadvantage that the time period remaining for the steaming process is relatively short so that the danger arises that the earth does not reach the necessary temperature for sterilisation. Furthermore, should the earth become damp from the steam, due to which it has a tendancy to stick together, then this can complicate obtaining a sufficient yield of earth and the further processing thereof.
A further application of the apparatus first described above, is the thermal decontamination of grounds of soil, which, for example, are loaded with highly evaporating or heavy decomposing organic harmful substances.
Such an apparatus has become known from DE-OS-3,543,845. With this known apparatus, a rotating drum is filled up with the material to be thermally treated and is here treated by a direct firing. Fuel and oxygen or an oxygen containing gas is fed into the rotating drum for the firing process. This apparatus also has the disadvantage that it is very time consuming and expensive.
Thus, the task of the present invention is to provide a device and a method for thermally treating loose materials, such as earth, sand, sewage sludge, gravel and the like, which has a simple construction and enables an economic thermal treatment of this type of materials.
According to the invention, this task is satisfied by the subject-matter of claim 1.
Preferred embodiments of the device according to the invention is the subject-matter of the dependent claims.
The device of the present invention is provided with a reception device formed as a surface arrangement having at least one surface section inclined with respect to the horizontal. The reception device in total or the horizontal inclined surface section is displaced into vibration by a vibration producing device, preferrably a magnetic vibrator or an unbalance motor. The device according to the invention further comprises a supply arrangement which supplies to the reception device and the at least one inclined surface section, the materials to be treated. Due to the inclination of the surface section and the vibrating movement, the loose materials slide along in the direction of the inclination of the surface section. A burner arrangement is provided above this surface section whose flame is directed directly onto the materials to be treated. This arrangement causes the materials which are to be treated to be heated up.
Within the term "loose materials", here it is to be understood that all types of materials which are capable of being shaken or having a
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patent: 4385567 (1983-05-01), Voss
patent: 4563959 (1986-01-01), Fujiwara
patent: 5161326 (1992-11-01), Weirich et al.
Astor Werner
Repnik Hermann
Bennett Henry A.
Rauchfuss, Jr. George W.
Tinker Susanne C.
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