Process for the recycling of residues for the production of port

Details Process for the recycling of residues for the production of port Process for the recycling of residues for the production of port

1999-01-29

2000-11-14

Ferensic, Denise L.

Heating

Processes of heating or heater operation

Including passing, treating or conveying gas into or through...

106771, 34135, F27B 1500

Patent

active

061461334

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention describes a new process for the material and thermal utilisation of residual materials containing water, minerals and combustible parts, especially from the paper industry, in cement kilns, for the production of Portland cement clinker.
2. Description of Related Art
In a series of industrial processes, sludges are produced in comparatively large amounts as waste which contain comparatively large amounts of water (30-70%), combustible organic substances (10-30%) and mineral filling materials, especially clay, silicate and lime (10-50%). Typical examples herefor is the waste sludge obtained in the recycling of waste paper or lacquers. Since a further processing of such products is, in most cases, not possible, it is necessary either to dump or burn them, whereby a high portion of ash is again obtained which must be dumped. The high portion of water is extremely disturbing for both processes so that, in the past, these residual materials had to be dried, often with high investment expense. However, the general shortage and expense of dumping possibilities and the dissipation of the residual minerals contained in the sludge wastes and the thermal energy contained in the organic components obliges one to look for a process to utilise such materials in another way.
By way of example, the production of paper is referred to. The clay-containing materials used in the case of paper production as filling material and for the surface coating remain behind in the working up of waste paper, together with fine-fibred cellulose, as residual material. This corresponds to the following average composition:


______________________________________ dry substance about 35-65% water about 65-35% mineral portion about 10-30% combustible portion about 10-35% calorific value about 3000-4000 kJ/kg. ______________________________________
A material and thermal utilisation of worthwhile amounts of such undried and untreated paper residual materials hitherto failed because of suitable processes and devices which make possible an economic and environmentally compatible utilisation. Therefore, the residual materials must be pre-dried, with high investment cost, to a residual water content of 10-30%.
Therefore, the task arises to find a process by means of which one can further work up residual materials containing water, mineral and combustible portions without previous drying and without the production of wastes to be dumped to give a usable end product.


SUMMARY OF THE INVENTION

This task is solved by a process for the production of Portland cement clinker in cement kilns and for the material and thermal utilization of residual materials containing water, minerals and combustible parts. The process includes: introducing, without previous drying, the residual materials into a cement plant with a conveyor into a shaft between a clinker cooler and a kiln head; taking up the residual materials by secondary air having a temperature of about 800-1000.degree. C. air and conveying the residual materials to the kiln; and introducing the taken up residual materials into the kiln, wherein the residual materials have a content of 65-35 parts water, as well as 35-65 parts dry substance consisting of 10-30 parts mineral parts and 10-35 parts of combustible parts.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic drawing of the last section of a rotary tube plant according to one embodiment of the invention.
FIG. 2 is graphical representation showing emissions output over a 24 hour period.


DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

From AT 394 711 B or EP 0 488 989 B1, it is already known, for the production of cement clinker in the case of the so-called secondary calcination, to introduce at the kiln entry low grade fuel, such rubber wastes, carbon-containing waste, oil sludge and the like, in order thereby to cover a part of the combustion energy needed for the calcination in the raw meal pre-heater. As is set out in this literature reference

REFERENCES:
patent: 5199987 (1993-04-01), Ernstbrunner
patent: 5392721 (1995-02-01), Judd
patent: 5456024 (1995-10-01), Klausmann et al.
patent: 5614016 (1997-03-01), Hundebol
patent: 5669969 (1997-09-01), Meade et al.
patent: 5711802 (1998-01-01), Theil

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