# US 2019/0168234 A1 · Coal pulverizing apparatus, control device and control method for same, and coal-fired power plant > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0168234 A1 - Document ID: US20190168234A1 - Status: Published application - Kind: A1 - Application number: 16/095,823 - Filed: 2017-02-07 - Published: 2019-06-06 - Earliest claimed: 2016-05-13 - Assignees: Mitsubishi Hitachi Power Systems, Ltd. - Applicants: Mitsubishi Hitachi Power Systems, Ltd. - Inventors: Rikio Inoue - Web page: https://patentgrep.com/patent/US20190168234A1 ## CPC - B02C 25/00: Control arrangements specially adapted for crushing or disintegrating - F23K 1/00: Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus - B02C 15/00: Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs {(high-speed drum mills B02C19/11)} - B02C 15/001: {Air flow directing means positioned on the periphery of the horizontally rotating milling surface} - B02C 15/007: {Mills with rollers pressed against a rotary horizontal disc (with pendularly mounted rollers B02C15/04)} - B02C 15/04: Mills with pressed pendularly-mounted rollers, e.g. spring pressed - F23K 1/04: Heating fuel prior to delivery to combustion apparatus - F23K 3/02: Pneumatic feeding arrangements, i.e. by air blast - B02C 2015/002: {combined with a classifier} - F23K 2201/00: Pretreatment of solid fuel - F23K 2201/10: Pulverizing - B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02}) - F23K: FEEDING FUEL TO COMBUSTION APPARATUS (fuel feeders specially adapted for fluidised bed combustion apparatus F23C10/22) ## Abstract A control device for the coal pulverizing apparatus includes a first command value generation part for generating a command value of a first parameter including at least one of rotational speed of the table, pressing force of the roller to the table, or air supply amount in the air supply part, and a second command value generation part for generating a command value of a second parameter including a rotational speed of the rotary classifier. The first command value generation part is configured to determine the command value of the first parameter, based on 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 determines the command value of the second parameter, based on a second preceding signal determined in accordance with at least the load information. ## Claims ### Claim at position 1 1-12. (canceled) ### Claim 13 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. ### Claim 14 (depends on 13) The control device for a coal pulverizing apparatus according to claim 13, wherein the first command value generation part is configured to, when a load of the combustion device increases, increase the first basic command value with an increase in the coal supply amount command and generate the first preceding signal having a positive sign, and wherein the second command value generation part is configured to, when the load of the combustion device increases, increase the second basic command value with an increase in the coal supply amount command and generate the second preceding signal having a negative sign. ### Claim 15 (depends on 13) The control device for a coal pulverizing apparatus according to claim 13, wherein the first command value generation part is configured to generate the first preceding signal, based on a product of a first reference preceding signal which increases with an increase in the coal supply amount command, an operation coefficient determined based on at least one of a magnitude of a load of the combustion device or a load change range of the combustion device, and an operation coefficient having a sign identical to that of the load change rate, and wherein the second command value generation part is configured to generate the second preceding signal, based on a product of a second reference preceding signal which increases with the increase in the coal supply amount command, an operation coefficient determined based on at least one of the magnitude of the load of the combustion device or the load change range of the combustion device, and an operation coefficient having a sign opposite to that of the load change rate. ### Claim 16 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. ### Claim 17 (depends on 16) The control device for a coal pulverizing apparatus according to claim 16, wherein the first command value generation part is configured to determine the first preceding signal so that a change rate of the first preceding signal is equal to or below a first rate limit determined based on the change rate of the command value of the second parameter. ### Claim 18 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. ### Claim 19 (depends on 18) The control device for a coal pulverizing apparatus according to claim 18, wherein the second command value generation part is configured to determine the second preceding signal so that a change rate of the second preceding signal is equal to or below a second rate limit determined based on the change rate of the command value of the first parameter. ### Claim 20 (depends on 13) The control device for a coal pulverizing apparatus according to claim 13, wherein the first command value generation part is configured to determine the first preceding signal in accordance with the load information and raw-material-coal characteristic information related to a characteristic of a raw material coal. ### Claim 21 (depends on 13) The control device for a coal pulverizing apparatus according to claim 13, wherein the second command value generation part is configured to determine the second preceding signal in accordance with the load information and raw-material-coal characteristic information related to a characteristic of a raw material coal. ### Claim 22 (depends on 20) The control device for a coal pulverizing apparatus according to claim 20, wherein the raw-material-coal characteristic information includes a water content of the raw material coal. ### Claim 23 (depends on 13) A coal pulverizing apparatus comprising: rotatable table; a roller configured to pulverize a coal supplied from the table; an actuator configured to press the roller to the table; a rotary classifier configured to classify a pulverized coal obtained by pulverizing the coal with the roller; an air supply part configured to generate an air flow for guiding the pulverized coal toward the rotary classifier; and the control device according to claim 13 configured to control the rotary classifier and at least one of the table, the actuator, or the air supply part. ### Claim 24 (depends on 23) A coal-fired power plant comprising: the coal pulverizing apparatus according to claim 23; a boiler configured to burn the pulverized coal from the coal pulverizing apparatus to generate steam; a steam turbine configured to be driven by the steam generated from the boiler; and a generator configured to be driven by the steam turbine. ### Claim 25 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. ### Claim 26 (depends on 21) The control device for a coal pulverizing apparatus according to claim 21, wherein the raw-material-coal characteristic information includes a water content of the raw material coal.