Furnaces – Combined – With boiler
Patent
1986-05-19
1987-06-16
Favors, Edward G.
Furnaces
Combined
With boiler
110110, 110229, 110258, F23B 700
Patent
active
046728996
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a pre-furnace heating plant for the combustion of solid combustible material of high ash content, in particular of bark and wood chips, which comprises a furnace chamber confined at its bottom by a grate and receiving the combustible material from above via a storage compartment, said furnace chamber being surrounded by a mantle of refractory material, a combustion channel connecting the furnace chamber with a succeeding boiler and extending through the mantle and having an opening for supplying secondary air, in the mantle there being provided a further opening for supplying primary air below the grate, this further opening being preferably closeable by means of a control flap being controlled by the boiler.
It is known that various combustible materials of high ash content, in particular wood bark, wood chips from sawmills and from agriculture, and also wet garbage, can not be burned in normal boilers for central heatings, because due to the permanent cooling effect of the heat carrier fluid (water) flowing through the mantle of the boiler, the furnace chamber can not be brought to the temperature required for the combustion of such a combustible material. Thus, a prefurnace burning equipment of the initially described type has become known for burning such a combustible material, which equipment is connected with its combustion channel to the furnace chamber of the central-heating boiler which acts as a heat exchanger. It is a drawback of the known equipment that frequently the combustible material forms an arch within the storage compartment and that the equipment can only be maintained operative for a short time interval of approximately one hour, whereupon the whole equipment must be cleaned on account of the highcontent in ash and in noxious matter of the combustible material, in particular wood bark. This operation is laboursome and troublesome and, in addition, no heat is supplied to the central-heating boiler during the cleaning period.
It is an object of the present invention to avoid the mentioned drawbacks and to improve a pre-furnace heating equipment of the initially described type such that arching within the storage compartment and thus also disturbances of the combustion process are avoided, and that also the efficiency of the equipment and the utilization of the combustible constituents of the combustible material are substantially improved. The invention solves this task by the fact that a gasifier ring is provided within the mantle and at a distance above the grate, which gasifier ring has an upright axis and has its top surface inclined in direction towards its central opening, and a worm member extending in direction towards this opening, said gasifier ring being rotatable around its axis by a drive means, so that the worm member conveys the combustible material through the opening of the gasifier ring. By this relative movement between gasifier ring and worm, the combustible material resting on the gasifier ring over a relatively large area is reliably taken along for rotation and is conveyed by the worm into the furnace chamber so that the combustible material located within the storage compartment and above the gasifier ring is loosened up and any arching of this material is destroyed, so that the combustible material is reliably fed into the furnace chamber. Thus it is ensured that always a sufficient amount of combustible material is present within the furnace chamber and that the combustion proceeds to the desired extent. It is thus not only avoided that the first within the furnace chamber is extinguished, but the furnace chamber or its wall, respectively, are always maintained at the temperature most favourable for the combustion process, which is just of importance for the combustion of problematic combustible material, in particular wood bark. Preferably, the worm member extends through the opening of the gasifier ring, whereby also an arching or bridging of the combustion material within the gasifier ring can be reliably avoided. The worm member can
REFERENCES:
patent: 3865053 (1975-02-01), Kulze et al.
patent: 4312278 (1982-01-01), Smith et al.
patent: 4559882 (1985-12-01), Dobson
patent: 4562777 (1986-01-01), van der Voort
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