Control device of coal pulverizer
View Patent ↗There is provided a control device of a coal pulverizer which enables estimation of a coal output with a precision suited for a purpose. In a control device of a coal pulverizer which pulverizes coal by the coal pulverizer and estimates coal output by which the pulverized coal is output to a boiler, the control device includes a main operation circuit which calculates a command signal associated with a coal feed rate on the basis of detection data from a boiler or a power generator connected to the boiler, and an additional control unit which calculates the deviation between a standard coal output pattern preset in the coal pulverizer, and a current coal output pattern, and adds a calculation result by the additional control unit to the main operation circuit as a correction signal.
1. A control device of a coal pulverizer which pulverizes coal by the coal pulverizer and estimates coal output by which the pulverized coal is output to a boiler, the control device comprising:
a main operation circuit configured to calculate a command signal associated with a coal feed rate on the basis of detection data from a boiler or a power generator connected to the boiler; and
an additional control unit configured to calculate a deviation between a standard coal output pattern preset in the coal pulverizer and a current coal output pattern of the coal pulverizing operation, and to generate a correction signal based on the deviation, the correction signal being used to correct the command signal, wherein
the additional control unit is configured to send the correction signal to the main operation circuit during the coal pulverizing operation,
wherein the correction signal is added to the command signal so as to correct the command signal, and
wherein the additional control unit comprises a coal output estimation unit configured to estimate the coal output of pulverized coal by using at least any of detection data from the coal pulverizer, detection data from the boiler, and detection data from the power generator.
2. The control device of a coal pulverizer according to claim 1 ,
wherein in the coal output estimation unit, any one of during settlement or during change of the coal pulverizer is selected, and the correction signal is calculated in the additional control unit on the basis of a coal output estimate on the selected side.
3. The control device of a coal pulverizer according to claim 1 ,
wherein the detection data input to the main operation circuit is a power generator output command value and a main steam pressure deviation or a main steam temperature deviation, and the command signal associated with the coal feed rate is a coal feed rate command value.
4. The control device of a coal pulverizer according to claim 1 ,
wherein the detection data input to the main operation circuit is a coal feed rate command value and a coal pulverizer current value, and the command signal associated with the coal feed rate is a rotation frequency command value of the coal pulverizer.
5. The control device of a coal pulverizer according to claim 1 ,
wherein the detection data input to the main operation circuit is a coal feed rate command value and a roll lift pressure value, and the command signal associated with the coal feed rate is a pressure setting value of an oil pressure load device provided in the coal pulverizer.
6. The control device of a coal pulverizer according to claim 1 , further comprising a correction circuit adapted to correct the preset standard coal output pattern based on a coal property.
7. The control device of a coal pulverizer according to claim 6 , wherein said coal property is a coal calorific power.
8. The control device of a coal pulverizer according to claim 6 , wherein said coal property is a coal moisture percentage.
9. The control device of a coal pulverizer according to claim 1 , wherein the coal output estimation unit is configured to calculate a coal output estimate based on a mill furnace differential pressure and a flow rate of pulverized coal carrying air.
10. The control device of a coal pulverizer according to claim 9 , wherein the coal output estimation unit is configured to correct the coal output estimate based on a deviation between the coal output estimate and the coal feed rate during settlement of the coal pulverizer.