PRODUCER-GAS TESTS. 
By Robert II. Fernald. 
INTRODUCTION. 
Iii presenting this brief prelim inary report of the producer-gas tests 
10 attempt is made to give detailed information, as the complete 
eport, to be published later, will deal at length with the methods 
mployed in conducting the tests, details of apparatus used, and meth- 
ds of working up the results from the data obtained. 
EQUIPMENT. 
The plant installed is a Taylor pressure gas producer, furnished by 
. D. Wood & Co., of Philadelphia. The producer of !250-horsepower 
ipacity is known as a No. 7 gas producer. It is 8i feet external 
iameter and 15 feet high and is connected through an economizer 3 
iet in external diameter and 10 feet high to a scrubber, whose exter- 
%\ dimensions are 8 feet in diameter by 20 feet in height. The 
irubber is filled with gas-house coke, which is constantly flushed with 
ater during the operation of the plant. From the scrubber the gas 
asses to the tar extractor, a piece of apparatus whose detailed con- 
action is carefully guarded by the manufacturers of the producer, 
it which resembles in outward appearance a centrifugal pump. The 
taed of rotation of this device is of vital importance in tar extraction. 
fter passing through the tar extractor the gas goes directly to the 
irifier, an iron box 8 feet square and 3 feet 3 inches in height. This 
>x is filled with oxidized iron tilings and shavings that remove the 
lphur from the gas, which next passes to the holder, a receiver a 
tie over 20 feet in diameter and 13 feet high, of 4,000 cubic feet 
parity. From the holder the gas is conducted through a meter of 
100,000,000 cubic feet capacity to a 3-cylinder vertical Westing 
[use gas engine with cylinders of 19-inch diameter and 22-inch si roke, 
ted at ^35 brake horsepower. The engine is in turn belted to a six 
jle 175-kilowatt Westinghouse direct-current generator. The load 
the generator is controlled by and the energy developed dissipated 
rough water rheostats especially constructed for the purpose. 
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