Stoves and furnaces – Fireplaces or accessories – Grate structure
Patent
1987-08-07
1989-11-21
Green, Randall L.
Stoves and furnaces
Fireplaces or accessories
Grate structure
126513, 126163R, 126152R, F24B 700
Patent
active
048815225
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for activating combustion in the hearth of a heating apparatus for burning solid fuel, especially wood, wherein the fuel is arranged together to form flowing embers in the hearth of the heating apparatus.
The invention also relates to a hearth fitting for carrying out this method as well as a fireplace comprising such a hearth fitting.
The combustion of solid fuels, especially wood, leads to the generation of gaseous products of which some are combustible, but necessitate a very high temperature for ignition. The same applies to certain solid particles which are carried along with the fumes. In conventional heating equipment, the temperature of the gaseous medium situated above the fuel is often not sufficiently high to cause ignition of these products, which then constitute a fuel that is lost to the atmosphere, harms the environment and represents a loss of energy efficiency of the heating apparatus. From this point of view, known fireplaces are particularly unfavorable, even if they are equipped with means for heat recovery. Such means do not effectively increase the temperature within the fireplace; they on the contrary generally contribute to reducing it by withdrawing heat from the flowing embers.
To avoid this drawback, patent application FR-A-2,515,792 provides for a wood-fired boiler, a fuel support comprising a solid central part in the form of a roof with a slight slope, and two lateral grates with inclined bars allowing the arrival of combustion air along two sides of the glowing embers. However, in spite of this arrangement, air nevertheless penetrates into the glowing embers, over their entire length and it cools them especially as that the fuel tends to spread over the lateral grates. Patent application FR-A-2,473,156 describes another way of introducing combustion air into the hearth of a fireplace. This hearth comprises a non-perforated and elevated metallic bottom which forms a part of a heat recuperator carrying a separate air or water circuit. The combustion air passes underneath this bottom, then in front of it, for introduction into the hearth in the form of a stream rising between the front edge of the bottom and the front opening of the hearth of the fireplace, to prevent the aspiration of air from the room in which the fireplace is located. This hearth moreover does not allow hotter glowing embers to be obtained than in a conventional fireplace with a non-perforated bottom, especially because the air enters into contact with the glowing embers substantially in the same manner. In addition, the bottom of the hearth is cooled by the hear recuperator.
The present invention thus has the object of providing a process and a device allowing activation of the combustion of solid fuel and/or the products which are generated therefrom, by means of an increase of the temperature in a part or the totality of the glowing embers, in order to thus obtain as complete combustion as possible.
To this end, the process according to the invention is characterized in that the air supplied to the combustion is introduced into the hearth in the form of a continuous stream on the entire periphery of the glowing embers to form a continuous ascendant air curtain which laterally surounds the entire glowing embers. The air is preferably introduced into the fireplace by natural draft after having been preheated.
Tests carried out by the inventor show that by introducing the air necessary for combustion in this manner, and not into the heart of the glowing embers, as is conventionally done for example through a fireplace grate, one may obtain in the glowing embers temperatures of the order of 1000.degree. C. This result may be explained by the fact that the ascending air curtain protects the glowing embers against any parasitic air circulation which could cool them, and that the ascending movement of the air curtain determines a certain depression in the glowing embers, which tends to contract the air curtain upwards and to bring air progressively into contact with the c
REFERENCES:
patent: 207362 (1878-08-01), Lester
patent: 376575 (1888-01-01), Bradford
patent: 411393 (1889-09-01), Peck
patent: 1465490 (1923-08-01), Seitz
patent: 1977651 (1934-10-01), Simeral
patent: 3289667 (1966-12-01), Nelson
patent: 4043313 (1977-08-01), Sherman
patent: 4136666 (1979-01-01), Haas
patent: 4159801 (1979-07-01), Roland
patent: 4177793 (1979-12-01), Johnson
patent: 4213445 (1980-07-01), Mayo
LandOfFree
Method for activating the combustion in a heating apparatus usin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for activating the combustion in a heating apparatus usin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for activating the combustion in a heating apparatus usin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1420659