Non recovery coke ovens battery May12

Non recovery coke ovens battery...

Non recovery coke ovens battery The manufacture of coke by heating coal in absence of air has its origins at the start of industrial revolution when Abraham Darby used in the smelting of iron ores in 1709 in England. The method of coke production was initially the same as for the production of charcoal, stockpiling coal in round heaps, igniting the piles, and then covering sides with clay. This laid the foundation for beehive coke making. Gradual advances led to the development of beehive, reverberatory and byproducts ovens, culminating into regenerative coke ovens with recovery of the byproducts around a century ago. There are three proven processes for the manufacture of metallurgical coke. These are Beehive coke ovens Byproduct coke ovens Non recovery coke ovens. When the heat energy of flue gases is recovered in the form of steam then these ovens are known as heat recovery coke ovens or energy recovery coke ovens. The first non recovery oven was built in Jewell in 1960s and the first non recovery coke plant with heat recovery was commissioned at Indiana USA in March 1998. The plant had 268 ovens with a capacity of 1.3 Mtpa and a heat recovery power plant rated at 100 MW. Coke making process in non recovery ovens In the process of coke making in the non recovery ovens (Fig 1), volatiles evolved during coal carbonization are not recovered as byproducts but are combusted in the oven itself in the presence of controlled quantity of air and the heat of the volatiles of evolving gases is utilized for coking of the coal mass into coke and thus no external heating is required. The higher level of heat importantly is used to break up the potentially polluting hydrocarbons into the constituent combustible...