Nippon Kokan (Japan) developed one of the first industrial systems for automatic coke-battery heating [1]. The control system of coking includes automatic temperature monitoring of the furnace walls, the heating channels, and the heating panels [2, 3]. In coke shops, the temperature of the coke mass is measured to determine its readiness; this is complicated by the extreme operating conditions of the measuring system. In this context, an indirect method of determining coke readiness from the temperature variation of the exhaust gas in the smokestack has been developed [4]. The measurement results are used to determine the cooking time, from loading to the attainment of maximum gas temperature in the smokestack. The total coking time is the sum of the cooking time and the coke delay during which the formation of coke structure is completed [5]. It is found that the coke delay time in the coking chamber prior to discharge cannot be less than 1 hr. The optimal delay time for each product depends on the state of the furnace, the batch quality, and the coking conditions. Basically, it is 2 hr from the time to reach maximum waste-gas temperature in the smokestack [6].
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