Pulverizer mill protection system

摘要

A system for suppressing and inhibiting fires in coal pulverizer mills can include a fire suppression solution storage tank, a flow control cabinet, an equipment control/pumping enclosure, an air distribution system, and injection piping and nozzles installed at various positions in one or more pulverizer mills. A first set of nozzle assemblies in communication with the fire suppression solution can be positioned in the mill to disperse the suppression solution within the classifier zone of the mill. A second set of nozzle assemblies in communication with the suppression solution can be positioned within the mill to disperse the suppression solution within the grinding zone. A third set of nozzle assemblies can be positioned within the primary air duct of the mill.

主权项

1. A pulverizer mill protection system comprising:
(a) at least one pulverizer mill comprising:
(i) a housing comprising an upper wall, a base, and a sidewall extending between the upper wall and the base,(ii) an inlet opening formed in the upper wall for receiving solid fuel therethrough,(ii) a classifying element positioned within the housing for classifying the solid fuel, wherein a classifier zone is defined by an area between the classifying element and the upper wall of the mill,(iii) a grinding element positioned within the housing downstream the classifying element for grinding the solid fuel, wherein a grinding zone is defined by an area outside of the classifying element, and(iv) a plenum chamber located within the housing below the grinding element; (b) a fire suppression solution; (c) classifier zone nozzle assemblies in communication with the fire suppression solution, and positioned within the housing to disperse the suppression solution within the classifier zone; (d) grinding zone nozzle assemblies in communication with the suppression solution, and positioned within the housing to disperse the suppression solution within the grinding zone; (e) plenum chamber nozzle assemblies in communication with the suppression solution, and positioned within the housing to disperse the suppression solution within the plenum chamber; and (f) a programmable logic controller operatively connected to the plurality of nozzle assemblies, wherein the programmable logic controller is programmed with a plurality of control algorithms instructing each of the nozzle assemblies to disperse suppressant solution at a selected interval, spray pattern and flow range in response to conditions in the pulverizer mill.