Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 67
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146 Collected fumes are normally vented to an electrostatic precipitator or high
energy wet scrubber.
Pre-Startup Operations
Pre-startup operations of a BOPF include:
•
conditioning of refractory lining and tap hole
•
testing of mechanical controls
•
instrument checks
•
checking raw material, process gas and coating water distribution lines
The refractory lining, including the tap hole. must be preheated before
the furnace is put in operation to prolong the life of the lining and to pre-
vent sudden thermal stresses when the furnace is initially charged.
The con-
dit:1.oning period, which varies with furnace size and type of· refractory, typic-
ally lasts up to several
weeks~
Instruments and mechanical equipment are checked to ensure proper opera-
tion and to correct any defects in installation.
The usual time period re-
quired to check equipment varies from 1 to several weeks.
Start-up Operations
The start-up period (ranging from initial heat until attainment of maximum
production) will vary in length from 2 days to a year, depending on the type
of furnace, and production demands.
Even though melt cycles will remain
lengthy at first, each steel heat will be produced at the rated furnace
capacity_
Once the furnace and ancillary equipment has been thoroughly checked out
it will take approximately 8 hours to bring the vessel on-line.
The cyclical
nature of the process suggests startup should be defined as the time the furnace
is put into operation for the first steel production
cy~le.
55
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