Method for controlling the pulverization and dryness of flammable materials passing through a pulverizer, and method of controlling the pulverizing rate of the pulverizer

Claim 1

A method for controlling a system of pulverizing and drying a flammable material, said method comprising: supplying said flammable material to a pulverizer operated by a pulverizer motor; mixing a main dry gas and a temperature regulating gas to form a mixed gas; using a push blower to feed said mixed gas into said pulverizer, so as to dry said material; using a pull blower having a suction damper to discharge a mixture of said mixed gas and pulverized material to a separator; performing a pressure control step of measuring the pressure of said mixed gas to one on an inlet or an outlet of said pulverizer and adjusting one of said blowers in response to said measured pressure so as to maintain the average pressure in said pulverizer substantially at atmospheric pressure; performing a flow rate control step of measuring the flow rate of said mixed gas through said pulverizer and adjusting the forced flow rate of another of said blowers in response to said flow rate measurement so as to maintain the flow rate of said mixed gas at a constant value; performing a temperature control step of measuring the temperature of said mixed gas at said outlet portion of said pulverizer and adjusting the mixing ration of said temperature regulating gas to said main dry gas in response to said measured temperature so as to maintain said measured temperature at a constant value.

Claim 2

A method for controlling a system of pulverizing and drying a flammable material, said method comprising: supplying said flammable material to a pulverizer operated by a pulverizer motor; mixing a main dry gas and a temperature regulating gas to form a mixed gas; using a push blower to feed said mixed gas into said pulverizer, so as to dry said material; using a pull blower having a suction damper to discharge a mixture of said mixed gas and pulverized material to a separator; performing a pressure control step of measuring the pressure of said mixed gas to one on an inlet or an outlet of said pulverizer and adjusting one of said blowers in response to said measured pressure so as to maintain the average pressure in said pulverizer substantially at atmospheric pressure; performing a flow rate control step of measuring the flow rate of said mixed gas through said pulverizer and adjusting the forced flow rate of another of said blowers in response to said flow rate measurement so as to maintain the flow rate of said mixed gas at a constant value; performing a temperature control step of measuring the temperature of said mixed gas at said outlet portion of said pulverizer and adjusting the mixing ration of said temperature regulating gas to said main dry gas in response to said measured temperature so as to maintain said measured temperature at a constant value.

Claim 6

A method of controlling the pulverizing rate of a pulverizer, comprising: supplying a flammable material to said pulverizer; using a pulverizer motor to operate said pulverizer; supplying a gas to one end of said pulverizer; discharging said gas and pulverized material from a second end of said pulverizer; using a pressure difference controller to detect a differential pressure between said ends of said pulverizer; emitting a signal from said pressure difference controller, said signal being proportional to a deviation of said detected differential pressure from a preset differential pressure; varying the rate of one of said flammable material supply and said pulverizing motor while maintaining said preset differential pressure at a constant value; and feeding said signal corresponding to a resulting differential pressure deviation to the other of said flammable material supply and said pulverizer motor, until said deviation becomes zero.

Claim 7

A method of controlling the pulverizing rate of a pulverizer, comprising: supplying a flammable material to said pulverizer; using a pulverizer motor to operate said pulverizer; supplying a gas to one end of said pulverizer; discharging said gas and pulverized material from a second end of said pulverizer; using a pressure difference controller to detect a differential pressure between said ends of said pulverizer; emitting a signal from said pressure difference controller, said signal being proportional to a deviation of said detected differential pressure from a preset differential pressure; varying the rate of one of said flammable material supply and said pulverizing motor while maintaining said preset differential pressure at a constant value; and feeding said signal corresponding to a resulting differential pressure deviation to the other of said flammable material supply and said pulverizer motor, until said deviation becomes zero.