CHAIRMAN'S ADDRESS - Coke Oven Managers Association

72 THE COKE OVEN MANAGERS’ASSOCIATIONBrit. Pat. 19,104 of 1910. Improvements in horizontal or inclined cokeovens in which the direction of draught is constant. In a heating system withthe same gas distribution arrangement to the vertical flues as in Brit. Pat. 6,813[above], recuperative and air-distributing flues run parallel on each side of thebattery, with the latter flues alongside a central waste gas flue. The air passesfirst into a hairpin flue at each end of the heating wall, in which it is furtherpreheated; this hairpin flue is closed off from the top horizontal flue.Brit. Pat. 23,562 of 1911. Improvements in horizontal or inclinedregenerative ovens. The principle of fractional combustion as in Brit. Pat.21,593 of 1907 [a horizontal-flue heating wall: see main text] is applied to theheating of regenerative ovens with vertical flues, using a four-divided heatingwall with gas burners at the top. Preheated air enters at one end of the heatingwall and flows up and down each set of flues successively. Fuel gas is shut offonly briefly during the reversal operation. In each set of flues, flow is upwardin some flues and downward (to a sole flue) in others.Brit. Pat. 29 of 1914; Fr. Pat. 476,912 of 1914. Process for purifying coalgas. After tar removal, the gas is washed with e.g. K 2 CO 3 + NH 4 OH solutionto absorb all free CO 2 and all free H 2 S, so that acid impurities remaining are nomore than sufficient to neutralise the NH 3 in the gas and are thus removed inscrubbing to recover ammonia. The solution is regenerated by partialdistillation (preferably in the type of still described in Brit. Pat. 337 of 1914[see main text]). Noxious still-head gases are mixed with vapour from anordinary ammonia still and passed through a saturator.Brit. Pat. 220,556 of 1924. Coke oven heating flues. In a heating wall of thekind described in Brit. Pat. 105,047 of 1916 [see main text], the vertical fluesare arranged in pairs. One flue of each pair is provided with air and fuel gasinlets at the bottom and an outlet to a top horizontal flue; the other is connectedto it by large ports at bottom and top and serves to recirculate the combustionproducts. Combustion takes place in one half-wall and then the other inalternate reversal periods. [Abstract taken from Gas World, Coking Sect., 4Oct. 1924, 20.]Brit. Pat. 254,652 of 1926. Improved construction of regenerative cokeoven flues. In a heating system with flues as in Brit. Pat. 105,047 of 1916 [seemain text] and Brit. Pat. 220,556 of 1924 [above], the regenerator inlets/outletsare arranged under each alternate flue so as to direct the flue gas to the fluesreceiving air from the regenerators; there is a single fuel gas supply to eachpair of flues, positioned beneath the mid-feather. The aim is fastercarbonisation.