Furnaces – Process – Burning pulverized fuel
Patent
1984-07-19
1986-02-18
Favors, Edward G.
Furnaces
Process
Burning pulverized fuel
110101CC, 110101CD, 110101CF, 110104R, 406197, F23D 100
Patent
active
045705526
ABSTRACT:
A process and apparatus for delivering carbon i.e., coal dust, to be combusted in a furnace is presented. The furnace is of the type having plural combustion points and may include a shaft furnace such as, for example, a blast or cupola furnace. The carbon dust is delivered in dosed quantities to each of the individual combustion points in a separate air stream which is under a predetermined pressure. The carbon (coal dust)/carrier gas (air) is delivered to each combustion point in the furnace at super critical speed, i.e., the speed of sound, the carrier gas having a relatively high proportion of solid material therein. The actual quantity of carbon material delivered to each combustion point is directly detected and monitored as a consequence of volumetric measurement and is appropriately corrected by means of a secondary air supply when the carbon quantity either exceeds or falls below a predetermined nominal value. The apparatus of the present invention includes plural conveyor lines being connected at one end thereof to a particular combustion point. The end of the conveyor line which is connected to the combustion point comprises a nozzle which delivers the carbon/carrier gas stream at a super critical outflow speed. The diameter of the nozzle and the predetermined pressure prevailing in the conveyor line is a function of the preselected nominal quantity of carbon which is to be delivered to the furnace.
REFERENCES:
patent: 4257334 (1981-03-01), Mueller
patent: 4373451 (1983-02-01), Gardner et al.
patent: 4389949 (1983-06-01), Heep
patent: 4441434 (1984-04-01), Howard
Boiting Hans-Herrmann
Rachner Hans-Gunther
Favors Edward G.
Paul Wurth S.A.
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