Page 28 - Critical Control flipbook_Neat

CRITICAL CONTROLS

Coal Mill Explosion

Inertization

Automatic initiation of the inertization sequence at the coal mill system upon

detection of trip limits in temperature and/or CO level.

Manual valves are locked Operator aware of auto Inertization system is
open and inert medium and manual inertization always active when mill

(CO or N ) tank is full. and related hazards. firing system is in operation.
2 2

Alarm and
Trips

N /CO tank
2 2

Inputs
o C

Pulverized coal
silo
CO Bar

Control system

Manual isolation valves

Actuated valve

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