bs sponge private limited - India Environment Portal

B.S. SPONGE PRIVATE LIMITED
Village: Taraimal, Tehsil: Gharghoda, District: Raigarh, (C.G.)
REIA Report for the Proposed Mini Integrated Steel Plant
Chapter – 4
Hence a stack of 72 m height will be provided to the AFBC boiler stack for effective
dispersion of emissions into the atmosphere.
4.1.3.3 STACK HEIGHT CALCULATION (ROLLING MILL)
FO Consumption per Rolling mill : 11.9 TPD
Sulphur content in FO : 4.5 % (by mass, Max.)
SO2 emission : 11.9 X 1000 X 4.5 X 2/24x100
: 44.625 Kg/hr
Stack Height H, : 14 (Q) 0.3
: 14 (44.625) 0.3 = 43.75 m or say 45 m
Hence stack of 45 m height will be provided for effective dispersion of emissions into
the atmosphere.
Sources of Air Emissions :
The main sources of fugitive emissions are raw material unloading, raw material handling,
crushers of coal, material transfer points, storage bins, etc. Dust generated from raw
material unloading areas is controlled by providing dust suppression system. In other
areas specified above dust extraction system with bag filters will be provided to control
the particulate emission.
The waste flue gases from kilns will be allowed to pass through a Waste Heat Recovery
Boiler (WHRB) and then after heat recovery the gases will pass through an Electrostatic
Precipitator (ESP) to bring down the particulate matter to less than 50 mg/Nm 3 and will be
let out into the atmosphere through two nos. of combined stacks (each with twin flues)
each of 60 m height for effective dispersion of emissions into the atmosphere.
Fumes will be evacuated directly from both the Induction Furnaces through a swiveling
type of hoods with an air-cooled ducting. The duct carrying fumes from the Induction
furnace and CCM will join a mixing chamber from where the gases will be led to the Bag
House by means of an ID fan. Clean gases having less than 50 mg/Nm 3 of particulates will
be let out through two common stacks (with two flues) each of 30 m height.
In Reheating Furnace the fuel proposed to be used is FO. Stack of 45 m height will be
provided for effective dispersion of SO2 emissions into the atmosphere.
The primary & secondary fugitive emissions from submerged Electric arc furnaces from
Ferro alloys unit will be treated in Fume extraction & cleaning system comprising of
PIONEER ENVIRO 4 - 8 Environmental Impact Assessment Report
Laboratories & Consultants Pvt. Ltd.