Pulverizer monitoring

摘要

A system for detecting a combustion-related condition in a pulverizer includes a pulverizer configured to receive coal chunks via an inlet, to grind the coal chunks into coal powder and to output the coal powder via an outlet. The system includes sensors configured to detect heat input characteristics supplied to the pulverizer and heat output characteristics emitted from the pulverizer. The system also includes a controller configured to determine, based on signals from the sensors, whether a combustion-related condition exists in the pulverizer based on a heat balance function including the heat input characteristics and the heat output characteristics.

主权项

1. A method for detecting a combustion-related condition in a pulverizer, the method comprising:
measuring, with sensors, input heat characteristics of a pulverizer and output heat characteristics of the pulverizer; and detecting a combustion-related condition in the pulverizer by performing a heat balance operation including the input heat characteristics and the output heat characteristics; wherein the heat balance function is:∑i=1outn⁢m.i⁢hi+∑j=1ink⁢m.j⁢hj=∑Q., wherein mj is mass flow of air into the pulverizer, mj is mass flow of air out from the pulverizer, hj is enthalpy input to the pulverizer hj is enthalpy output from the pulverizer and Q is a change in energy, and wherein the detecting the combustion-related condition includes determining that Q is greater than a predetermined threshold.