774 THE COLLIERY GUARDIAN. October 15, 1915. * Range of Colliery Boilers Generating Steam from Coke-oven Gas. ••Ma1 ' ... TT ’■■ ."’.v L e ’ ■ / • • •*>; • .JLv • ‘..J twHIf Preliminary Gas Coolers with Gas-Conducting Main, Gas Holder, Separating and Tar and Ammonia Liquor Storage Tank, Breeze Recovery Elevator, and Coal Washery. B" ■ ::< ■ 'W»l if " w ' ■ ■■'■ ■ .■. ■W'L'' 3' 1 View of Ovens from Pusher Side with Chimney and Coke-Pushing and Coal-Levelling Machine. scrubbers in series filled with boards in counter-current to the gas. After passing through a gas holder the gas is returned to heat the ovens. The rich oil after benzol extraction flows to a tank, from whence it is pumped to the benzol house, where the benzol is recovered by dis- tillation. The oil, after passing through a heat exchanger — where it extracts heat from the benzol vapours —• enters a superheater, where its temperature is raised to 185 degs. Cent, by means of steam. From the superheater it flows to the still, and the distillation is then completed by means of live steam. After passing through a baffle plate cooler and three Woolf’s coolers, it enters a storage tank, and is then circulated once again through the scrubbers. Two other tanks are provided for the storage of the crude benzol. The creosote oil storage tank is divided into two portions, one for the storage of the de-benzolised oil, and the other for the storage of fresh oil. A cooling frame is also provided for the cooling of the water used around the plant, and this is capable of treating 35,000 gals, in 24 hours, and of reducing the temperature to that of the atmosphere. This battery of 60 by-product coke ovens is equal to dealing with 160,000 tons of coal per annum. The coke produced is about 70 per cent, by MOT GAS FROM OVENS CAS REHEATED BY EXHAUST- STEAM TAR EXTRACTOR AMMONIA CONVEYOR RE-HEATER SATURATOR CENTRIFUGAL DRYER TAR TANK AMMONIACAL LIQUOR TANK1 SEPARATING ’: tank t , li'.i ■ Hchiji EXHAUSTER .cj COOLER B ! Diagram Showing Recovery Process. to liberate the ammonia or to re-heat the gas after cooling and tar extracting. For both these purposes the exhaust steam from the engines driving the exhausters is more than sufficient. The gas passes out of the saturator by the main K, by which it is conducted back again to the ovens and to other points where required. In those instances where benzol is required to be recovered from the gas, it is necessary for the gas to be cooled down after leaving the saturator, after which it is subjected to the usual scrubbing operations. The liquor condensed earlier in this process is distilled with milk of lime, and the ammonia evolved is led into the gas main, and so passes with the gas into the saturator. The gas then passes to the final coolers, where the temperature is reduced to that required for the efficient extraction of benzol, namely, 15 to 20 degs. Cent. The benzol is extracted by means of creosote oil, which passes down three tower weight of the coal used, and it is claimed to be low in phosphorus, sulphur, and ash, besides being of excellent quality, and of good mechanical condition. The average yields are stated to be 70 per cent, coke, 5 per cent, tar, 1’3 per cent, sulphate of ammonia, and 22 gals, of benzol. There is approxi- mately 50 per cent, of surplus gas, or 6,000 cu. ft. per ton of coal, of a calorific value of 500 British thermal units, after extraction of the benzol. The gas at Shotton is used under a battery of boilers and burners of the Altenhein and Wilson design. The illustrations are sufficiently self-explanatory as to render unnecessary anything further in the way of description, and the write1- expresses his indebtedness to Mr. J. J. Brest, mining engineer, of Hardwick Hall, Castle Eden, the agent for the Horden Company’s group of collieries, for facilities to visit the works during con- struction, and also after completion, and also for per- mission to publish the foregoing particulars, and the accompanying drawings and photographs.