Coke Ovens & Coal Chemical Plant

Coal is converted into coke by heating the prepared coal blend charge in the coke ovens in the absence of air at a temperature of 1000oC-1050oC for a period of 16/19 hours. The volatile matter of coal liberated during carbonization is collected in gas collecting mains in the form of raw coke oven gas passing through stand pipes and direct contact cooling with ammonia liquor spray. The gas cooled from 800oC to 80oC is drawn to Coal Chemical Plant by Exhauster. The residual coke is pushed out of the oven by pusher car through a guide into coke bucket. The red-hot coke is taken to coke dry cooling plant for cooling.

The main by-product in the process of coke making is crude coke oven gas and this has a lot of valuable chemicals. Coal Chemical Plant recovers Ammonia (NH3), Tar and Benzol from CO-Gas. The primary by-products from Crude CO Gas are Ammonium Sulphate (NH4)2SO4, Crude Tar, Crude Benzol and cleaned coke oven gas. The cooled coke from CDCP (Coke Dry Cooling Plant) is separated into 3 fractions, BF Coke i.e. +25-70 mm, which is sent to Blast Furnaces, Coke Breeze i.e. +0-15 mm, which is sent to Sinter making and nut coke i.e., +15-25 mm, which is also used in the Blast Furnaces.


  • There are 5 batteries, each having 67 ovens. .
  • The volumetric capacity of each oven is 41.6 m3.
  • Dry Coal charge /Oven is 32 tons.

Salient Features

  • Largest and technologically unique Coke Oven Batteries in the country at the time of commissioning
  • 7 meter tall coke ovens batteries.
  • 100% Dry Quenching of coke using Nitrogen gas.
  • Power generation, from the waste heat recovered, at BPTS (Back Pressure Turbine Station).


  • Production capacity (for 5 Batteries) – 3.700 Mt of BF coke per annum

Commissioning Dates

  • Battery No. 1 - 1st Pushing - 06.09.1989.
  • Battery No. 2 - 1st Pushing - 31.10.1991.
  • Battery No. 3 - 1st Pushing - 30.07.1992.
  • Battery No. 4 - 1st Pushing - 12.04.2009.
  • Battery No. 5 - 1st Pushing - 22.12.2020.