Furnaces – Crematory
Patent
1992-11-16
1994-06-07
Favors, Edward G.
Furnaces
Crematory
110211, 110212, 110214, F23G 100
Patent
active
053179781
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an arrangement in incinerating furnaces of a specific kind, viz. cremation furnaces and furnaces for similar purposes adapted to be charged in batches.
BACKGROUND OF THE INVENTION
Present furnaces for cremation and like purposes are, with extremely few exceptions, based on old technology, hardly meeting the functional demands of today, especially concerning smoke emission. Apart from older constructions having electrical heating, in some instances supplemented with wood-firing, which are passed over here, cremation furnaces normally have a supporting source of heat in the form of an oil or gas burner which sees to that necessary combustion temperature is reached in the furnace chamber.
On incinerating biological material including cremation, as well as on incinerating other materials temporarily generating large smoke volumes, an efficient final burn-out of the fumes before any flue gas cleaning takes place is necessary. However, such efficient final burn-out is not achievable in existing constructions. On the contrary and as a result of the dimensioning of the combustion chamber and flue chamber for an average combustion value, heavy smoke emission through the funnel may occur on charging the furnace and on the disintegration of the burning material.
The supporting heating mentioned above is necessary as the material to be burned and especially the biological material has a low combustion supporting energy content.
One problem with incineration of the present kind is that the combustion has a very un-even progress with a high load during the initial phase and and a progressively subsiding load towards the end with corresponding gas generation.
The un-even progress of combustion and the associated un-even energy demand/consumption of present constructions result in varying temperatures of the fume or combustion gases, which in turn, have a tendency for forming streaks of streams resulting in un-allowable emissions of non burned out gases and of un-desired materials, e.g. toxic combines, mercury vapours and the like.
The main problem, technically seen, at cremation furnaces resulting in an un-even combustion load, is the batchwise charging of the furnace--cremations are executed one after the other--and this amplies that one can not, as in furnaces for continuous and even charging of material to be burned, keep up a continuous and essentially invariable progress of combustion.
OBJECT OF THE INVENTION
A principal object of this invention is to make it possible to reach an efficient final burnout of the combustion fumes in spite of the fact that they, because of the un-even combustion progress, vary both in volume and contents. An additional object is to secure such a final burning out of the fumes that they cause no environmental disadvantages, as well as no aesthetic disadvantages and above all a final burning out which neutralizes environmentally hazardous hydrocarbons, toxic compounds and the like, which have had to be endured with conventional technology.
SUMMARY OF THE INVENTION
The invention is based on the understanding that in order to reach the desired efficient final burning out it must be arranged for the fumes to be collected in an after-burning chamber where a necessary high and constant temperature level can be secured, and further seen to that secondary and tertiary air necessary for the combustion is added and simultaneously a mixing of the gases in order to eliminate the risk for the forming of streaks of non burned hydrocarbons and the like is achieved. The foregoing is accomplished in accordance with the invention by arranging, after the combustion chamber proper, a first collecting or balancing chamber, which--seen in the direction of the flow--further away is restricted by a passage or gate having an area adapted to a pre-determined volume and velocity of gas, and inside such chamber operates--essentially in the direction of flow of the gases--an oil or gas burner facilitating the final burning out. Inside a furt
REFERENCES:
patent: 1742868 (1930-01-01), Mann
patent: 4321878 (1982-03-01), Segrest
patent: 5014630 (1991-05-01), Looker
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