By CENTRAL ELECTRICITY GENERATING BOARD
ISBN-10: 0080160603
ISBN-13: 9780080160603
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Additional resources for Mechanical Boilers, Fuel-, and Ash-Handling Plant
Example text
In order t o S E C O N D A R Y AIR PORTS - j C O A L BURNERS OIL L I G H T I N G UP B U R N E R S / I A N D S E C O N D A R Y AIR PORTS ν jj BURNER TILT M E C H A N I S M COAL BURNERS |p S E C O N D A R Y AIR PORTS — F I G . 3. The I . C . L . f. burner for corner firing 26 MODERN POWER STATION PRACTICE achieve the flame length required, windbox pressures of the order of 3-5 in. are necessary and with larger furnaces up to 4*5 in. may be required. A modern refinement of this burner is the tilting burner by which steam temperature control is obtained by tilting the burners either upwards or downwards.
It is particularly important with corner firing where uniform gas distribution across the furnace is more difficult to achieve. 4. Burner Windbox As burner capacities have increased, windbox dimensions have increased correspondingly to meet secondary air requirements. A difficulty thus arises on the very wide furnaces of ensuring that all burners receive the correct proportion of air at all times. The simple windbox is no longer acceptable; aerodynamic studies are now made of all windbox designs and their supply ducts, the final designs incorporating adequate deflectors or are appropriately shaped to give the required conditions.
This station has been chosen because of the particularly abrasive coals delivered there: thus its resistance to wear can be established. 2. e. the low volatile coals of South Wales) are in use. Low volatile coals burn with a long flame so that mixing of a type provided by the turbulent burner is not required. Thorough mixing of the coal and air is obtained by dividing the secondary air and coal into alternate streams or by admitting the coal in a thin stream surrounded by secondary air (Fig. 2).
Mechanical Boilers, Fuel-, and Ash-Handling Plant by CENTRAL ELECTRICITY GENERATING BOARD
by Ronald
4.3