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 are 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 are positioned within the mill to disperse the suppression solution within the grinding zone. A third set of nozzle assemblies are 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) an inlet opening formed in an upper wall of the mill for receiving solid fuel therethrough,(ii) a classifying element positioned within the mill 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 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 primary air duct, wherein a primary air duct zone is defined by an area within the primary air duct; (b) a fire suppression solution; (c) a first set of nozzle assemblies in communication with the fire suppression solution, and positioned within the mill to disperse the suppression solution within the classifier zone; (d) a second set of nozzle assemblies in communication with the suppression solution, and positioned within the mill to disperse the suppression solution within the grinding zone; and (e) a third set of nozzle assemblies in communication with the fire suppression solution and positioned within the primary air duct to disperse the suppression solution within the primary air duct, wherein each of the third set of nozzle assemblies comprise:
(i) a first inlet for receiving the suppression solution,(ii) a second inlet for receiving pressurized air from an air distribution system,(iii) an elongate wand in communication with the first and second inlets and positioned within the primary air duct, and(iv) a plurality of fine mist nozzles connected to the wand for dispersing the suppression solution and the pressurized air.