| 摘要 |
<p>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.</p> |
