Combustion – Flame holder having protective flame enclosing or flame...
Patent
1987-08-20
1990-04-10
Price, Carl D.
Combustion
Flame holder having protective flame enclosing or flame...
431 2, 431347, 431326, F23D 1312
Patent
active
049156217
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a gas-heated heat exchanger with a pipe feeding heating gas, where the wall of the pipe is interspersed by at least a longitudinally running bundle of gas exit nozzles.
2. Description of the Related Art including information disclosed under 37 CRF .sctn..sctn. 1.97-1.99
It is known that the nitrogen oxide (NO.sub.x) contents of exhaust gases can be influenced by changing three essential parameters, that is, of temperature, partial pressure of oxygen, and time.
It is further known that the height and distribution of the temperature can be controlled by cooling of the burner chamber walls or the burner plate.
However, if one considers the temperatures within the individual flame, then it can be recognized that the maximum temperature is located neither at the base of the flame nor, in case of multi-flame burners, at the edge of a flame zone, but is located in each case within the upper third of each individual flame.
Rods made of a refractory or thermally stable material can be positioned such at the burner next to the burner flames that they deflect the heat for a temperature balancing from the hot zones into cooler regions.
In fact, this achieves a decrease in the nitrogen oxide (NO.sub.x) content of the exhaust gases, but in case of cramped space situations, the flames are disturbed such that the carbon monoxide (CO) emission increases. The rods should be provided at a larger distance from the flames, whereby, in fact, the carbon monoxide content would be reduced but the nitrogen oxide content would increase.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a heat exchanger of the kind initially designated such that a distribution of the heat as uniformly as possible can be achieved and, in fact, by cooling in that region of the burner flames which is the hottest, i.e. about the upper third of the flames.
According to the invention, this problem is resolved by arranging in a heat exchanger of this kind the bundles or longitudinal sequences of gas exit openings on two sides of a pipe line, in each case, which serves for conducting a heat-storing medium, which pipe line is disposed parallel to the pipe carrying the heat-carrying gas.
This structure is associated in particular with the advantage that such pipe lines, serving for cooling purposes, can be attached at an advantageously selectable optimum distance from the outside of the heating gas-carrying pipe with solid supports at the wall of the heating gas-carrying pipe. The pipe line, serving for cooling purposes, can be brought into an optimum position relative to the flames forming at these nozzles, that is, to about the level of the upper third of these flames.
Further advantages resulting from this structure include a decrease of the gas volume of heating gas and primary air or, respectively, secondary air, a decrease of the flow resistance and a more compact structure of the flames. Furthermore, there is provided a decrease of the dwelling time, a better mixture of the exhaust gases, a better burn-out, a high flame stability and, finally, a decrease both of the nitrogen oxide (NO.sub.x) contents as well as of the carbon monoxide (CO) contents of the exhaust gases.
BRIEF DESCRIPTION OF THE DRAWING
In detail, there is shown in
FIG. 1, the heat exchanger in cross-section
FIG. 2, a plan view of the heat-exchanger,
FIG. 3, there is illustrated the invention solution in principle, and
FIG. 4, there is illustrated an enlarged view of the burner pipe.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The heat exchanger comprises at least one heating gas-conducting pipe 1. The wall of the heating gas-conducting pipe 1 is interspersed by several bundles of gas exit openings 2 or, respectively, 3. The nozzles of so-called maintaining flames are designated with 2, and the nozzles of the main flames are designated with 3. Fixed points 4 at the front ends of the pipe connections facilitate the exact connection to a pipe strand.
Conduction pipes for conducting the h
REFERENCES:
patent: 1003180 (1911-09-01), Hall
patent: 1315993 (1919-09-01), Shepardson
patent: 1532612 (1925-04-01), Taylor
patent: 2612890 (1952-10-01), Harsh
patent: 2807257 (1957-09-01), Collins
patent: 4050877 (1977-09-01), Craig et al.
patent: 4323343 (1982-04-01), Reed et al.
patent: 4525141 (1985-06-01), Dewerth
patent: 4616994 (1986-10-01), Tomlinson
patent: 4652236 (1987-03-01), Viessmann
Pieper Thomas
Schilling Jurgen
Joh. Vaillant GmbH und Co.
Kasper Horst M.
Price Carl D.
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