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MODERN GASWORKS PRACTICE
The retorts are lieated in a series of superimposed chambers and the heats can. be readily controlled. The chambers of the setting are divided into three, the top or waste-gas circulating chambers, the middle or heating chambers, and the bottom or regenerator chambers.
The Glover-West system of heating the retorts readily conforms to the require-ments for the continuous production of water-gas by passing steam through the charge during the process of carbonization within the retort; the mixture of coal-gas and water-gas being of suitable proportions to produce the required calorific
Fig. 81.—Glover-West System. Bottom Discharging Chambers and Extractok Gear.
value of the gas. This combination increases the yield of thermal units of the gas-per ton of coal carbonized, with an increase of tar and ammoniacal liquor. Economy is efEected by the utilization in some cases of the water-gases for the generation of the steam required for the water-gas manufacture.
THE INTERMITTENT SYSTEM
This system was introduced in 1902, and in its earliest form apertures were introduced for taking off the gas from the side of the retort. Two years later these