Document kDVdR70OQ7g4rGpXG9pLDV2yE

release oven gases to the atmosphere through bypass stacks when the heat recovery steam generators are not available due to maintenance or repair. The redlined versions of the Proposed Rule's changes includes the following new term and definition: distillation under negative pressure to produce coke. and lAlliCh is desitmed for the combustion of the coke oven gas from which by-products are not recovered. For nonrccovery plants (i.e., no chemical recovery) with heat recovery, the flue o`-en gases are sent to a heat recovery steam generator that produces steam. For nonrccovery coke oven batteries (i.e., no chemical recovery) without heat recovery, flue oven gases are treated in the common tunnel afterburner and then released to the atmosphere through waste heat stacks. Heat recovery coke oven batteries also may release flue oven gases that have been treated in the common tunnel afterburner to the atmosphere through bypass stacks when the heat recovery steam generators arc not available due to maintenance, or repair, or malfunction. The proposed changes provide an inaccurate description of the equipment and the process. SunCokc requests revising this definition as follows: Heat recovery steam generator is a process unit that recovers heat from coke oven gas in order to produce steam. The redlined versions of the Proposed Rule's changes includes the following new term and definition: Heat recovery steam generator is a process unit that cools the gas by recoN ering heat and producing steam, so that flue gas can he treated by pollution control equipment recovers heat from coke oven gas in order to produce steam. The proposed changes provide an inaccurate description of the equipment and the process. SunCokc requests revising this definition as follows: Heal recovery steam generator hypassAvasie heat stack means a stack that exhausts coke oven gas into the atmosphere without passing through a IIRSG. A IIRSG bypass/waste heat stack exhausts coke oven gas directly from the oven batteries to the atmosphere. Heal recovery steam generator hypassAvasie heat stack means a stack that exhausts flue gas treated by the common tunnel afterburner coke oven gas into the atmosphere to maintain negative pressure within the oven w, hen the HRSCis are not ailable due to maintenance, repair. or malfunction without passing through a I IRSG. A I IRSG bypass, waste heat stack exhausts coke oven gas directly from the oven batteries to the atmosphere. 53 Sierra Club FOIA 2025-EPA-04883 ED_018388_00000109-00054 SC_EVERSPLIT0005728