. The street railway review . volatile matter,as well as the fixed carbon, will be completely burned in order todevelop the full heating value of the fuel. The following conditions are necessary to insure the completecombustion of tlic fuel: 1. A sufficient supply of air. 2. Thorough mixture of air and fuel. 3. A sufficiently high temperature of the air and the combustiblegases to insure their ignition and perfect combustion before theycome in contact with the cooling surfaces of the boiler. The principal source of loss is due to imperfect combustion ofthe volatile gases, which are distilled v
. The street railway review . volatile matter,as well as the fixed carbon, will be completely burned in order todevelop the full heating value of the fuel. The following conditions are necessary to insure the completecombustion of tlic fuel: 1. A sufficient supply of air. 2. Thorough mixture of air and fuel. 3. A sufficiently high temperature of the air and the combustiblegases to insure their ignition and perfect combustion before theycome in contact with the cooling surfaces of the boiler. The principal source of loss is due to imperfect combustion ofthe volatile gases, which are distilled very rapidly after fresh coalis placed upon the fire, and not being mixed with air at a temperaturesufficient to cause ignition, pass off unconsumed; or the air supplyand the temperature being sufficient, they are allowed to come incontact with the comparatively cool surfaces of the boiler, and th irtemperature reduced below the ignition point before combustion iscompleted, so tliat they escape when only partially burned. The. FIG. 3—BOILER ROOM MANCHESTER ST. STATION. greater part of their energies to perfecting the arrangement of en-gines, generators and switching apparatus, frequently neglecting themore important, though less showy, boilers and their recent years they have come to realize that a larger percentage ofsaving can be made by a proper attention to the design and manage-ment of the boiler room than in any other department, as it is herethat the greater number of preventable losses in a power station,occur. The designs of the standard types of steam boilers which arenow generally used have been perfected to such a degree that effi-ciencies as high as 70 to 75, and even 80 per cent, have been attainedunder favorable conditions, and there are very few improvementswhich the power station engineer can suggest which will produceany considerable saving in fuel. The design of the furnace, as distinguished from the boiler, onthe contrary, is one requiring ca
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