Suction gas plants . ry in the air until it reaches aconstant weight; a laboratory sample is then taken and theresidual moisture determined. The amount of incombustiblematerial must be accurately determined, and in this way thegrate efficiency of the producer is found. The method of samp-ling the coal has been already explained. In sizing the sampleit should be crushed to pass through a S-in. mesh and thenair-dried for twenty-four hours or more, long enough to ensurethat the quantity of moisture remaining will vary less than1 per cent. For the determination of water-vapour, tar, and soot in th
Suction gas plants . ry in the air until it reaches aconstant weight; a laboratory sample is then taken and theresidual moisture determined. The amount of incombustiblematerial must be accurately determined, and in this way thegrate efficiency of the producer is found. The method of samp-ling the coal has been already explained. In sizing the sampleit should be crushed to pass through a S-in. mesh and thenair-dried for twenty-four hours or more, long enough to ensurethat the quantity of moisture remaining will vary less than1 per cent. For the determination of water-vapour, tar, and soot in the gas,the use of the following apparatus, designed by Professor Lord, isadvised. Referring to fig. 16, B is the sampling tube made of•5-in. iron pipe which is placed in the gas flue. This is 44 SUCTION GAS PLANTS. surrounded by a jacket A, through which live steam is passed bymeans of the pipe connections C and D. The object of this is to r^t^J I I I I I ? ^ K ! il!!ili!iM!ihhh!ii!i!i il ^llililljiililijilililiil. keep the temperature of B below the point at which the ironwould act on the COg, but above that at which the moisture of DETAILS OF CONSTRUCTION. 45 the gas would be condensed. After leaving this pipe, the gaspasses through a condenser E, through which cold water iscirculated, into a flask F, which is filled with ignited asbestos fibre,and contains a thermometer G. The water tank J is connectedto F through a valve I, by means of a rubber tube H. This tankis also fitted with a small tube in which there is a thermometerQ. The object of the valve R is to allow the thermometer to beremoved when gas is in the tank J. There is another water tankL, connected to J by means of the tube K. On the top of thewater in L is a float M which is connected by the glass tube N(acting as a syphon) to the nozzle 0, which has a pinchcock P,on the rubber connection. The object of the float and glass tubeis to keep a constant head above the nozzle and thus ensure aconstant flow through it.
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