Furnaces – Utilizing powdered fuel – Having secondary air mixing means
Patent
1984-05-03
1985-08-20
Yuen, Henry C.
Furnaces
Utilizing powdered fuel
Having secondary air mixing means
122367C, 110256, 110253, F23D 100
Patent
active
045357080
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a hot bulb ignition head for a device for firing rough ceramics, particularly bricks, including a connecting tube for the intermittent delivery of solid fuel by compressed air, a cylindrical tube end portion of greater diameter which is connected fixedly to the connecting tube, and a baffle plate at the outlet end which forms at least two outlet openings.
BACKGROUND OF THE INVENTION
Such a hot bulb ignition head is already known from German Pat. No. 24 41 680 (which corresponds to British Pat. No. 1 516 877). In this conventional hot bulb ignition head, the distribution of the ejected solid fuel in only one specific direction does not exist. Also the danger of the destruction of the hot bulb ignition head by the occurrence of explosions is not entirely excluded and, finally, adapting the fuel distribution to different kiln conditions is not possible.
A basic purpose of the invention is to improve the conventional hot bulb ignition head so that the danger of destruction or damage of the hot bulb ignition head by explosions is avoided, better fuel ejection in the desired directions occurs, and favorable adaptation to different kiln dimensions and firing conditions is possible in a simple manner.
SUMMARY OF THE INVENTION
This purpose is attained by providing a hot ignition head which includes a connecting tube for the intermittent delivery of solid fuel by compressed air, a cylindrical tube end portion of greater diameter which is fixedly connected to the connecting tube, and a baffle plate at the outlet end of the tube end portion which forms at least two outlet openings. Two opposed, flat plates are secured in the tube end portion parallel to the longitudinal axis thereof and are connected to the baffle plate at the end of the tube end portion so as to create back-pressure chambers between the plates and the tube end portion.
Due to the hot bulb ignition head being equipped with back-pressure chambers, relatively strong explosions can be controlled without any danger. The opposed outlet openings with their guide surfaces and guide chambers assure a more accurately aimed ejection of the granulated solid fuel. Finally the insertion pieces permit a simple and quick adapting of the firing process to varying firing conditions, such as oven cross sections and the like. Furthermore, the igniting areas for the fuel are considerably enlarged, so that a more effective explosion can be achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be discussed in greater detail hereinafter in connection with an exemplary embodiment which is illustrated in the drawings, in which:
FIG. 1 is a side view of a hot bulb ignition head for a device for firing rough ceramics, particularly bricks;
FIG. 2 is a top view of the ignition head of FIG. 1;
FIG. 3 is a cross sectional view taken along the line III--III of FIG. 1;
FIG. 4 is a bottom view of the hot ignition head of FIG. 1;
FIG. 5 is a side view of an insertion piece for a baffle plate which is a component of the head of FIG. 1; and
FIG. 6 is a top view of a different insertion piece.
DETAILED DESCRIPTION
The hot bulb ignition head 1 which is illustrated in FIG. 1 has a cylindrical connecting tube or conduit 2 through which the hot bulb ignition head can be connected to a feed device which intermittently supplies the hot ignition head, which is inside of a kiln, with solid fuel for example in the form of granular coal, using compressed air. The amounts of fuel and compressed air delivered are measured so that an explosion occurs in the hot bulb ignition head, by which the solid fuel particles are ejected from the hot bulb ignition head and distributed over the kiln cross section.
An elongate, hollow body member, here a cylindrical tube end portion 3, is fixedly connected to the connecting tube 2, the inside diameter of the tube end portion 3 being larger than the inside diameter of the connecting tube 2. The tube end portion 3 is welded at its upper end to the connecting tube 2, if necessary by inserting a fro
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