Furnaces – With fuel treatment means – Means for liberating gas from solid fuel
Patent
1996-04-29
1997-10-21
Bennett, Henry A.
Furnaces
With fuel treatment means
Means for liberating gas from solid fuel
110224, 110263, F23G 512
Patent
active
056784953
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a device for the combustion of solid fuels, a so called solid-fuel stove, which is usable for the heating of, for instance, water for heat exchangers/radiators located in houses and flats and/or for a water work system with tapping points for hot water. A solid-fuel stove of the above-mentioned type may be provided as an insert for a fireplace or the like or may be provided as a free-standing and separate unit.
2. Prior Art
On burning/combustion of solid fuels containing moisture, combustion must be preceded by drying/evaporation of the moisture content of the fuel at a temperature of around 100.degree. C. and thereafter degasification of the fuel within a temperature range of 300.degree.-500.degree. C. Combustion should then take place at an ideal temperature of 1100.degree. C. In modern boilers, stoves or the like, which often have, for instance, ceramic inserts in their combustion chambers so as for these in the heated condition to reflect and maintain combustion, a visible and imperfect combustion during the temperature raising period may go on for an hour or longer depending on the amount of ceramics and other material in the combustion chamber.
DESCRIPTION OF THE INVENTION
In order to quickly achieve complete combustion of solid fuels after ignition in a solid-fuel stove, meaning that complete combustion is achieved already on ignition/start, thereby to reduce environmental influence and generation of carcinogens, there has been developed a device for the combustion of solid fuels, a so called solid-fuel stove, comprising two chambers interconnected by a ceramic filter or the like. One chamber is adapted for drying and degasification of the fuel. The other chamber, which may be located under the first chamber, is adapted for combustion of the gas generated on degasification. One or more heat sources are connected with the solid-fuel stove to act at an initial stage for drying and degasification of the fuel and for giving the ceramic filter an operating temperature of 1100.degree. C. until combustion can take place in a normal way unsupported by the heat sources and provide an effective bed of embers, part of the heat generated being used for continued drying and degasification of fresh fuel.
BRIEF DESCRIPTION OF THE FIGURE
The FIGURE shows a schematic cross section of a preferred embodiment of a solid-fuel stove according to the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As indicated in the FIGURE, an upper chamber 2 in a solid-fuel stove 1 is provided for drying and degasification of the fuel at 100.degree. C. and 300.degree.-500.degree. C., respectively. The upper chamber 2 may essentially be surrounded by a reflective material 3 such as ceramics. Between the upper chamber 2 and a lower chamber 4 for combustion of the gas generated on degasification there is provided a partition 5 having a ceramic filter 6 or the like with an operating temperature of 1100.degree. C. In the partition 5, there may be disposed one or more heating sources 7 to provide a temperature of, for example, not more than 500.degree. C. for drying and degasification. In the filter 6 there may be disposed one or more heat sources to give the filter an operating temperature of around 1100.degree. C. Drying and degasification of the fuel and combustion of the gas generated on degasification are initiated by external energy supplied. The heat sources are thus provided to work at an initial stage but also thereafter to promptly secure complete combustion, such as on starting and on, for instance, a possible decrease in temperature in the stove depending on fuel being supplied or ashes being discharged. By means of the heat sources, such as electric current, gas or other kind of energy, the fuel is thus first dried and immediately thereafter energy supplied is recovered by permitting condensation of the gas generated, whereby it is possible to utilize the heat by, among others, returning it to the combustion air. After evaporation of the moistur
REFERENCES:
patent: 4213947 (1980-07-01), Fremont et al.
patent: 4676175 (1987-06-01), Ledebrink et al.
patent: 5460511 (1995-10-01), Grahn
WO 87/00909 to John E.M.B. Millns et al. entitled "Method and Apparatus for Buring Solid Fuel, " published 12 Feb. 1987.
Patent Abstracts of Japan, vol. 13, No. 206, M-826 of JP-A-1-28409, dated Jan. 31, 1989 to Fujioka et al.
Engwall Sten
Johansson Ulf
Bennett Henry A.
O'Connor Pamela A.
System Teeg AB
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