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A type of furnace developed to burn lower grade coals, it is water cooled and insulated to maintain a high furnace temperature. Crushed coal enters with the primary air in the furnace tangentially, while the secondary air is supplied to the furnace chamber.



Related Terms

TERTIARY AIR

Air for combustion supplied to the furnace to supplement the primary and secondary air.

POLAR AIR

A type of air whose characteristics are developed over high latitudes, especially Within the subpolar highs. Continental polar air has low surface temperature, low moisture content, and especially in its source regions, has great stability in the lower layers. It is shallow in comparison with arctic air. Maritime polar air initially possesses similar properties to those of continental polar air, but in passing over warmer water it becomes unstable with a higher moisture content.

FURNACE DRAFT

The negative air pressure generated by buoyancy of hot gases inside a furnace. The temperature difference between gases within the furnace and in the atmosphere along with furnace and stack height basically determine the amount of draft generated by the furnace. Draft is generally measured in negative inches of water column. ('-w.c.'; 27.7 inches w.c. = 1 psig)

AIR-WATER JET

A jet of mixed air and water which leaves a nozzle at high velocity.

BURNER WINDBOX

A plenum chamber around a burner in which an air pressure is maintained to ensure proper distribution and discharge of secondary air.

DURATION OF RISE

Duration of rise is the interval from low water to high water, and duration of fall is the interval from high water to low water. Together they cover, on an average, a period of 12.4 2 hours for

REVERSING FALLS

Falls which flow alternately in opposite directions in a narrow channel in the St. John River, New Brunswick, Canada, due to the large range of tide and a constriction in the river. The direction of flow is upstream or downstream according to whether it is high or low water on the outside, the falls disappearing at the half- tide level.

FORCED AIR TYPE FURNACE

A furnace that uses a fan to circulate the air in the system.

GREAT TROPIC RANGE

The difference in height between tropic higher high water and tropic lower low water. Often shortened to TROPIC RANGE.

NONHARMONIC CONSTANTS

Tidal constants such as lunitidal intervals, ranges, and inequalities which may be derived directly from high and low water observations without regard to the harmonic constituents of the tide. Also applicable to tidal currents.

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