Coal pulverizing apparatus, control device and control method for same, and coal-fired power plant

A control device for a coal pulverizing apparatus, the coal pulverizing apparatus including a rotatable table, a roller configured to pulverize a coal supplied from the table, a rotary classifier configured to classify a pulverized coal obtained by pulverizing the coal with the roller, and an air supply part configured to generate an air flow for guiding the pulverized coal toward the rotary classifier, the control device comprising:

• a first command value generation part configured to generate a command value of a first parameter including a rotational speed of the table;
• and
• a second command value generation part configured to generate a command value of a second parameter including at least a rotational speed of the rotary classifier,
• the first command value generation part being configured to determine the command value of the first parameter, based on a sum of
• a first basic command value determined in accordance with at least a coal supply amount command to the coal pulverizing apparatus, and
• a first preceding signal determined in accordance with at least a load change rate of load information of a combustion device which burns the pulverized coal from the coal pulverizing apparatus,
• the second command value generation part being configured to determine the command value of the second parameter, based on a sum of
• a second basic command value determined in accordance with at least the coal supply amount command, and
• a second preceding signal determined in accordance with at least the load change rate,
• the first command value generation part being configured to generate the first preceding signal having a positive or negative sign identical to that of the load change rate,
• the second command value generation part being configured to generate the second preceding signal having a positive or negative sign opposite to that of the load change rate.

A control device for a coal pulverizing apparatus, the coal pulverizing apparatus including a rotatable table, a roller configured to pulverize a coal supplied from the table, a rotary classifier configured to classify a pulverized coal obtained by pulverizing the coal with the roller, and an air supply part configured to generate an air flow for guiding the pulverized coal toward the rotary classifier, the control device comprising:

• a first command value generation part configured to generate a command value of a first parameter including a rotational speed of the table;
• and
• a second command value generation part configured to generate a command value of a second parameter including at least a rotational speed of the rotary classifier,
• the first command value generation part being configured to determine the command value of the first parameter, based on a sum of
• a first basic command value determined in accordance with at least a coal supply amount command to the coal pulverizing apparatus, and
• a first preceding signal determined in accordance with at least load information of a combustion device which burns the pulverized coal from the coal pulverizing apparatus,
• the second command value generation part being configured to determine the command value of the second parameter, based on a sum of
• a second basic command value determined in accordance with at least the coal supply amount command to the coal pulverizing apparatus, and
• a second preceding signal determined in accordance with at least the load information,
• wherein the first command value generation part is configured to determine the first preceding signal, based on a change rate of the command value of the second parameter.

A control device for a coal pulverizing apparatus, the coal pulverizing apparatus including a rotatable table, a roller configured to pulverize a coal supplied from the table, a rotary classifier configured to classify a pulverized coal obtained by pulverizing the coal with the roller, and an air supply part configured to generate an air flow for guiding the pulverized coal toward the rotary classifier, the control device comprising:

• a first command value generation part configured to generate a command value of a first parameter including a rotational speed of the table;
• and
• a second command value generation part configured to generate a command value of a second parameter including at least a rotational speed of the rotary classifier,
• the first command value generation part being configured to determine the command value of the first parameter, based on a sum of
• a first basic command value determined in accordance with at least a coal supply amount command to the coal pulverizing apparatus, and
• a first preceding signal determined in accordance with at least load information of a combustion device which burns the pulverized coal from the coal pulverizing apparatus,
• the second command value generation part being configured to determine the command value of the second parameter, based on a sum of
• a second basic command value determined in accordance with at least the coal supply amount command to the coal pulverizing apparatus, and
• a second preceding signal determined in accordance with at least the load information,
• wherein the second command value generation part is configured to determine the second preceding signal, based on a change rate of the command value of the first parameter.

A control method for a coal pulverizing apparatus including a rotatable table, a roller configured to pulverize a coal supplied from the table, a rotary classifier configured to classify a pulverized coal obtained by pulverizing the coal with the roller, and an air supply part configured to generate an air flow for guiding the pulverized coal toward the rotary classifier, the control method comprising:

• a first command value generation step of generating a command value of a first parameter including a rotational speed of the table;
• a second command value generation step of generating a command value of a second parameter including at least a rotational speed of the rotary classifier,
• the first command value generation step including determining the command value of the first parameter, based on a sum of
• a first basic command value determined in accordance with at least a coal supply amount command to the coal pulverizing apparatus, and
• a first preceding signal determined in accordance with at least a load change rate of load information of a combustion device which burns the pulverized coal from the coal pulverizing apparatus,
• the second command value generation step including determining the command value of the second parameter, based on a sum of
• a second basic command value determined in accordance with at least the coal supply amount command to the coal pulverizing apparatus, and
• a second preceding signal determined in accordance with at least the load change rate,
• the first preceding signal having a positive or negative sign identical to that of the load change rate,
• the second preceding signal having a positive or genitive sign opposite to that of the load change rate.