Combustion – Porous – capillary – particulate or sievelike flame holder,...
Patent
1984-06-05
1986-02-11
Green, Randall L.
Combustion
Porous, capillary, particulate or sievelike flame holder,...
F23D 340
Patent
active
045696578
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plate with a alveolar radiating face for radiant burners.
2. Prior Art
Radiant burner plates generally have rows of through holes serving to channel the mixture of fuel and combustion agent from the rear face of the plate to the radiating face. In order to increase the radiating power of the plate, the prior art has already contemplated in the front face of the plate, cavities or alveoli forming a plurality of holes. A hole which has been truncated before leading out onto the front face of the plate in fact distributes the flame produced by it in such a manner that it heats the surfaces surrounding the cavity or alveolus.
Nevertheless, in known plates the alveoli formed leave between them a certain number of holes which do not increase the radiating power of the plate.
The present invention seeks to obviate the above-mentioned and other disadvantages of known arrangements with the aid of a radiant burner plate having an alveolar front face and made of a ceramic material, in which rows of holes are formed for the passage of the fuel-combustion agent mixture and in which it is possible to provide alveoli regularly disposed in rows and ensuring the participation of all the holes existing in the plate, irrespective of the staggered, squared or offset pattern of the rows of holes.
SUMMARY OF THE INVENTION
Maximum transfer of heat between the flames and the plate is obtained by increasing the wall surface of contact of the material of the plate, with all the combustion products.
This results in raising the temperature of these walls and consequently, for the same power consumption, there is a substantial increase in the radiation power, and therefore of the radiation output.
In addition, a reduction of losses through conduction to the rear of the plate is achieved, since the amount of material existing between two adjacent alveoli is reduced to a minimum and also because emissivity is increased by the particularly pronounced relief of the radiating face of the plate.
For the purpose of solving the problem according to the present invention, the following geometrical considerations are taken as the starting point:
Given a plate comprising a plurality of rows of holes, which may be distributed in any squared, staggered or offset arrangement, as will be made clear later on, it is first necessary to define the distribution of the bases of the alveoli on the front face of the plate in relation to these rows. Any hole in a row is selected, and either four or six holes neighbouring this selected hole are considered; nevertheless, it should be noted that this alternative has no limitative effect on the invention, because it is possible to start with either number of neighbouring holes in order to find a satisfactory arrangement of alveoli.
Starting from the centre of any hole selected, vectors joining this centre to the centres of the neighbouring holes are traced. Four or six vectors characterized by their direction, their sense and their length are thus obtained. The figure formed by segments joining the ends of the said vectors defines what will hereinafter be called the theoretical alveolus base. Depending on the number of vectors, this figure has the shape of a quadrilateral or hexagon. If a given vector is considered, there will always be in this figure, in relation to this vector, a vector placed on the right, a vector placed on the left, and a vector situated opposite, which will be called the "contrary vector" because it does not always coincide with the opposite vector in the mathematical sense of the term, particularly when the figure has the shape of an irregular polygon.
Thus, according to the invention, the radiant burner plate having an alveolar front face, composed of a ceramic material and having rows of holes for the passage of the combustion agent/fuel mixture, is characterized in that the alveoli are arranged in the radiating front face of the plate in accordance with a family of patterns with distribution in
REFERENCES:
patent: 2122132 (1938-06-01), Docking
patent: 4063873 (1977-12-01), Naito
Green Randall L.
Solaronics Vaneecke
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