. The steam-engine and other heat-motors. st-steam may passthrough a feed-water heater. Steam-boiler (Fig. 3).—The furnace, the heat-transmitting sur-face and the chimney must be designed so that a certain amountof coal can be regularly burned and the resulting heat utilized inthe formation of steam with the greatest practical economy. Thefurnace-grate must be placed in such position that the fireman isable not only to distribute the coal properly but also can keepthe incandescent fuel properly levelled, free from holes and clearof clinkers Great economy of combustion is only secured by theadm
. The steam-engine and other heat-motors. st-steam may passthrough a feed-water heater. Steam-boiler (Fig. 3).—The furnace, the heat-transmitting sur-face and the chimney must be designed so that a certain amountof coal can be regularly burned and the resulting heat utilized inthe formation of steam with the greatest practical economy. Thefurnace-grate must be placed in such position that the fireman isable not only to distribute the coal properly but also can keepthe incandescent fuel properly levelled, free from holes and clearof clinkers Great economy of combustion is only secured by theadmission of the proper amount of air at the right time. Whenbituminous coal is thrown on the front of the grate it needs verylittle air as long as it is only drying out and heating up. When ELEMENTARY PRINCIPLES. 11 the coal commences to give off combustible gases the air-supplyshould be proportionally increased. The heating-surface of the boiler is that surface (above thecenter of gravity of the fire) which has water on one side and hot. gases on the other. It should be so arranged that repairs maybe easily made, the cleaning of either the inside or outside of theheating-surface should not be difficult, and its position should besuch that the steam-bubbles forming on it should free themselvesand rise easily. 12 THE STEAM-ENGINE AND OTHER HEAT-MOTORS The draft, whether produced by a chimney or by means offans, should be ample at all times. Chimney-draft is called nat-
Size: 1386px × 1802px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisheretcetc, booksubject
