CN115445753A - One-key automatic warm grinding control method for coal-fired unit - Google Patents
One-key automatic warm grinding control method for coal-fired unit Download PDFInfo
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- CN115445753A CN115445753A CN202211108462.6A CN202211108462A CN115445753A CN 115445753 A CN115445753 A CN 115445753A CN 202211108462 A CN202211108462 A CN 202211108462A CN 115445753 A CN115445753 A CN 115445753A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
- F25D31/005—Combined cooling and heating devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses a one-key automatic warm grinding control method for a coal-fired unit. The problem that small-flow measurement is inaccurate exists in the primary air flow of most coal mills during warm mill of coal-fired unit of configuration medium speed direct-fired pulverizing system, leads to mill to organize the unable automatic closed-loop control of cold, the hot-blast accent door of coal mill during warm mill, seriously restricts the degree of automation that warm mill was organized to the mill. The method comprises the steps of calculating to obtain the average coal quantity of a mill group according to the real-time operation parameters of the current pulverizing system of the unit, calculating to obtain the residual load capacity of the current mill group by combining a dynamic coal quantity estimated value and the upper limit of the coal quantity of the mill group, predicting the warm grinding time of the mill group by taking a sliding time window generated by a mill group warm grinding starting time sequence based on statistics as a boundary condition, optimally sequencing the warm grinding starting sequence of the mill group by combining the arrangement of the mill group, the operation switching rule of the mill group, the overhaul or fault of the mill group and the like, automatically sending a mill group warm grinding starting instruction, calling a warm grinding starting sequential control function group and automatically finishing the warm grinding of the mill group.
Description
Technical Field
The invention belongs to the field of automatic control and intelligent control, and particularly relates to a one-key automatic warm grinding control method for a coal-fired unit suitable for configuring a medium-speed direct-fired pulverizing system.
Background
The coal pulverizing system is an important auxiliary machine system of a combustion control system of the coal-fired unit, the coal pulverizing system of the large ultra-supercritical unit is generally provided with 6 sets of grinding groups, and main equipment of each set of grinding group of the coal-fired unit provided with the medium-speed direct-fired coal pulverizing system comprises a coal-grinding oil pump, a coal feeder, a coal mill, related air doors and the like. The running number and the output of the mill groups in the pulverizing system are synchronous with the load of the mill group in real time, and the mill groups are started and stopped in time according to the increase and decrease of the load of the mill group. With the rapid transformation of energy structures in China, the peak shaving capacity of basic energy power mainly based on coal-fired power generation directly determines the development space of renewable energy sources such as wind power generation and solar power generation, a large amount of intermittent energy power grid connection inevitably forces a coal-fired power generating set to participate in deep peak shaving comprehensively and deeply, the deep peak shaving of the coal-fired power generating set is normalized, and the starting and stopping frequency of a mill set is increased continuously. As an important direction of intelligent development of a thermal power generating set, an automatic power plant start-up and shut-down system (APS) of the set is developed and practiced for many years, the design concept and the operation mode of the APS are gradually accepted by the power generation industry and are gradually applied to a control system of a large-scale power plant, and the APS as a system with relatively independent functions can completely design the functions of the APS of the powder making system to complete one-key automatic start-stop control of the powder making system.
Whether the warm grinding of the coal mill can be safely, quickly and flexibly finished in the starting process of the grinding unit or not is a key technical problem which restricts whether the starting function unit of the powder preparation system can be practical or not all the time, so that the outlet temperature of the coal mill meets the requirement. Every time the powder process system starts, all need warm mill to the coal pulverizer, warm mill in-process need according to the relevant air door of sequential operation, adjust mill cold, hot-blast accent door aperture in real time, still need to maintain parameters such as coal pulverizer exit temperature, primary air flow, entry wind pressure at the certain limit simultaneously, at present domestic coal-fired unit adopts operating personnel manually operation's control strategy in the face of complicated and repeated warm mill operation mostly, not only wastes time, has still aggravated operating personnel's operation burden greatly. In addition, in the running process of the unit, due to lack of accurate prediction of the unit load, the running personnel can only manually determine the warm grinding time of the coal mill according to the unit states such as the output of the coal pulverizing system, the target load change trend and the like, the selection of the warm grinding time is not proper, the starting of the coal pulverizing system is directly influenced, and the load capacity and the plant power consumption rate index of the unit are further related.
The problem that small-flow measurement is inaccurate exists in the primary air flow of most coal mills during warm mill of coal-fired unit of configuration medium speed direct-fired pulverizing system, leads to mill to organize the unable automatic closed-loop control of cold, the hot-blast accent door of coal mill during warm mill, seriously restricts the degree of automation that warm mill was organized to the mill.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a one-key automatic warm grinding control method of a coal-fired unit suitable for configuring a medium-speed direct-fired pulverizing system.
Therefore, the technical scheme adopted by the invention is as follows: a coal-fired unit one-key automatic warm grinding control method comprises the following steps:
step 1, judging whether a one-key automatic warm grinding function of a grinding set is put into use, if so, performing step 2, and if not, waiting in step 1;
step 2, calling a warm mill starting time model of the mill group;
step 3, calling a mill group warm mill starting sequence model according to the mill group warm mill starting opportunity model;
step 4, outputting a mill set warm mill starting instruction according to the mill set warm mill starting time model and the mill set warm mill starting sequence model;
and 5, calling a warm grinding starting sequential control function group according to the warm grinding starting instruction of the grinding unit.
Further, the specific content of step 2 is as follows:
firstly, calculating to obtain the average coal quantity of the running mill groups according to the current total coal quantity of the unit, the number of the running mill groups and the coal supply offset, and meanwhile, calculating to obtain the boiler variable load feedforward when the unit carries out load increase of 10 MW-20 MW through the unit AGC rate, and estimating the dynamic coal quantity; then, combining the upper limit of the coal quantity of the mill group to obtain the residual loading capacity of the unit under the current mill group; and finally, predicting the warm grinding starting time of the grinding set by taking a sliding time window generated by the warm grinding starting time sequence of the grinding set based on statistics as a boundary condition.
Further, the specific content of step 3 is as follows: and generating a mill running switching rule through arrangement of mill groups of the unit, comprehensively considering the running state of the mill groups, and optimally sequencing the warm mill starting sequence of the mill groups.
Further, step 5, the detailed steps of the coal-fired unit warm grinding start sequence control function group configured with the medium-speed direct-fired pulverizing system are as follows:
5.1, opening an electric plug board door at the outlet of the coal feeder, closing a pneumatic valve at the outlet of the coal pulverizer pebble coal tank and opening a pneumatic valve at the inlet of the coal pulverizer pebble coal tank;
5.2, opening an electric inserting plate door at the inlet of the coal feeder and a sealing wind electric baffle of the coal mill;
5.3, opening a pneumatic inserting plate door at the outlet of the coal mill;
5.4, opening a cold and hot primary air pneumatic inserting plate door of the coal mill;
5.5, call coal pulverizer cold, hot-blast warm mill whole control module of adjusting a door: the control of cold and hot air adjusting doors of the coal mill is divided into a cold air door positioning valve position mode, a cold air door climbing and boosting mode, a hot air door positioning valve position mode and a hot air door climbing and warming mode, 4 modes of flexible scheduling under cold and hot working conditions of a mill group are achieved, and rate self-adaptive warm mill control is automatically completed.
Further, the formation process of the mill group warm mill starting time sequence based on statistics is as follows:
the method comprises the steps of establishing a sliding time window when the running number of a plurality of mill groups is increased by utilizing a historical data set of a unit milling system, taking the time when a coal mill outlet pneumatic plugboard door and a coal mill cold and hot primary air pneumatic plugboard door are in an opening state as a starting representation of the sliding time window and the time when the coal mill is started as an ending representation of the sliding time window, calculating a time difference delta t of the time window according to the starting time and the ending time of the sliding time window, taking the warm mill starting time recorded by the sliding time window as an effective warm mill opportunity when the delta t is smaller than a time threshold required by warm milling, generating a boundary condition of the warm mill opportunity when the running number of the current mill group is increased by using the starting time of the sliding time window, further taking the boundary condition as a constraint condition of a mill group warm mill opportunity prediction model when the running number of the same mill group is increased, and excavating the relation between the rising load and the mill group warm mill time.
Further, the mill group operation switching rule is as follows:
according to the arrangement condition of 6 sets of grinding groups configured by a unit pulverizing system, carrying out block coding, respectively coding a lower layer, a middle layer and an upper layer of a front wall into a (1), a (2) and a (3), respectively coding a lower layer, a middle layer and an upper layer of a rear wall into a b (1), a b (2) and a b (3), wherein the running number of the front wall grinding groups is n, the running number of the rear wall grinding groups is m, carrying out condition constraint on the starting priority of the grinding groups, and generating a grinding group running switching rule.
Further, mill group start priority constraints are as follows:
(1)a(1)>a(2)>a(3)；
(2)b(1)>b(2)>b(3)；
(3)a(1)>b(1)；
(4)a(2)>b(2)；
(5)a(3)>b(3)；
(6)|n-m|<2。
further, in step 5.5, during the warm grinding period of the mill group, according to the real-time operation data of the mill group, the cold and hot air adjusting doors of the coal mill are divided into a cold air door positioning valve position mode, a cold air door climbing and boosting mode, a hot air door positioning valve position mode and a hot air door climbing and warming mode, and meanwhile, a rate-up PID controller, a hot air door warm grinding PID controller and a cold air door warm grinding PID controller are introduced.
Furthermore, when the automatic warm grinding instruction of the grinding group is triggered, the calling of the warm grinding full-control module of the cold and hot air regulating door of the coal mill is completed according to the following steps:
1) Entering a cold air door positioning mode, and setting a cold air adjusting door of the coal mill at a certain opening degree to perform cold air through flow of the coal mill;
2) Entering a cold air door climbing and boosting mode, generating a coal mill cold air door-regulating warm grinding instruction by a cold air door warm grinding PID controller, and automatically regulating the outlet pressure of the coal mill;
3) Entering a hot air door fixed valve position mode, dividing a mill group warm grinding state into a cold state warm grinding state and a hot state warm grinding state according to the primary air temperature at the outlet of the unit air preheater, and then adjusting the hot air door of the coal mill to different opening degrees according to the mill group warm grinding state to pre-warm the mill group warm grinding;
4) Entering a hot air door climbing warming mode, wherein the rate-of-rise PID controller and the hot air door warm grinding PID controller simultaneously play a role in the mode, firstly calculating the temperature rise rate of the outlet temperature of the coal mill, limiting the actual temperature rise rate by utilizing an upper limit module and a lower limit module of the temperature rise rate, then automatically generating an outlet temperature set value when the coal mill is warm ground by utilizing the rate-of-rise PID controller, and finally generating a hot air door warm grinding instruction of the coal mill by utilizing the hot air door warm grinding PID controller to automatically adjust the outlet temperature of the coal mill.
Still further, the cold air door warm mill PID controller be: automatically adjusting without deviation according to the deviation of the outlet pressure of the coal mill and the set value of the hot milling air pressure of the coal mill to generate a cold air door adjusting and warm milling instruction of the coal mill;
the hot air door warm grinding PID controller is as follows: automatically adjusting without deviation according to the deviation between the outlet temperature of the coal mill and the set value of the outlet temperature of the coal mill to generate a hot air door-adjusting warm-grinding instruction of the coal mill;
the rising rate PID controller is as follows: setting a parameter proportional action coefficient in the rate-increasing PID controller to be 0, setting the integral time to be 60s, changing the rate-increasing PID controller into an incremental PID with pure integral action, inputting the deviation to the temperature rise rate of the outlet of the coal mill limited by the upper limit module and the lower limit module of the temperature rise rate, when the actual temperature rise rate is in the limit range, setting the temperature of the outlet of the coal mill output by the rate-increasing PID controller to be the actual temperature of the outlet of the coal mill, and keeping the hot air door-adjusting warm grinding instruction of the coal mill unchanged at the moment, when the actual temperature rise rate exceeds the upper limit of the temperature rise rate, the set value of the outlet temperature of the coal mill output by the rising rate PID controller is smaller than the actual temperature of the outlet of the coal mill, at the moment, the hot air door adjusting warm grinding instruction of the coal mill becomes smaller, so that the temperature rise rate of the outlet temperature of the coal mill is reduced, when the actual temperature rise rate is smaller than the lower limit of the temperature rise rate, the set value of the outlet temperature of the coal mill output by the rising rate PID controller is larger than the actual temperature of the outlet of the coal mill, at the moment, the hot air door adjusting warm grinding instruction of the coal mill becomes larger, and the temperature rise rate of the outlet temperature of the coal mill is improved.
Compared with the prior art, the invention has the following beneficial effects: the method comprises the steps of calculating to obtain the average coal quantity of a mill group according to the real-time operation parameters of the current pulverizing system of the unit, calculating to obtain the residual load capacity of the current mill group by combining a dynamic coal quantity estimated value and the upper limit of the coal quantity of the mill group, predicting the warm grinding time of the mill group by taking a sliding time window generated by a mill group warm grinding starting time sequence based on statistics as a boundary condition, optimally sequencing the warm grinding starting sequence of the mill group by combining the arrangement of the mill group, the operation switching rule of the mill group, the overhaul or fault of the mill group and the like, automatically sending a mill group warm grinding starting instruction, calling a warm grinding starting sequential control function group and automatically finishing the warm grinding of the mill group.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of an automatic control method for a one-key automatic warm grinding control of a coal-fired unit according to the present invention;
FIG. 2 is a schematic control logic diagram of a cold air and hot air door adjusting warm grinding whole-process control module of the coal mill.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention with reference to the specific embodiments of the present specification and the accompanying drawings. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to be exhaustive or exhaustive. All other embodiments, which can be derived by a person skilled in the art from the embodiments given in the description without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a control flow chart of a one-key automatic warm grinding control method for a coal-fired unit according to an embodiment of the present invention.
A coal-fired unit one-key automatic warm grinding control method comprises the following steps:
step 1, judging whether a one-key automatic warm grinding function of a grinding set is put into use, if so, performing step 2, and if not, waiting in step 1;
step 2, calling a warm mill starting time model of the mill group;
step 3, calling a mill set warm mill starting sequence model according to the mill set warm mill starting time model;
step 4, outputting a mill set warm mill starting instruction according to the mill set warm mill starting time model and the mill set warm mill starting sequence model;
and 5, calling a warm mill starting sequential control function group according to the warm mill starting instruction of the mill group.
Specifically, the specific content of step 2 is as follows:
firstly, calculating to obtain the average coal quantity of the running mill groups according to the current total coal quantity of the unit, the number of the running mill groups and the coal supply offset, and meanwhile, calculating to obtain the boiler variable load feedforward when the unit carries out load increase of 10 MW-20 MW through the unit AGC rate, and estimating the dynamic coal quantity; then, combining the upper limit of the coal quantity of the mill group to obtain the residual loading capacity of the unit under the current mill group; and finally, predicting the warm grinding starting time of the grinding set by taking a sliding time window generated by the warm grinding starting time sequence of the grinding set based on statistics as a boundary condition.
Specifically, the specific content of step 3 is as follows: the mill group operation switching rules are generated through the arrangement of the mill groups of the unit, the operation states of the mill groups are comprehensively considered, and the warm mill starting sequence of the mill groups is optimally sequenced.
Specifically, step 5, the detailed steps of the coal-fired unit warm-grinding start sequence control function group configured with the medium-speed direct-fired pulverizing system are as follows:
5.1, opening an electric inserting plate door at an outlet of the coal feeder, closing a pneumatic valve at an outlet of a pebble coal box of the coal mill, and opening a pneumatic valve at an inlet of the pebble coal box of the coal mill;
5.2, opening an electric inserting plate door at the inlet of the coal feeder and a sealing wind electric baffle of the coal mill;
5.3, opening a pneumatic inserting plate door at the outlet of the coal mill;
5.4, opening a cold and hot primary air pneumatic inserting plate door of the coal mill;
5.5, call cold, hot-blast warm whole control module that grinds of coal pulverizer: the control of cold and hot air adjusting doors of the coal mill is divided into a cold air door positioning valve position mode, a cold air door climbing pressure boosting mode, a hot air door positioning valve position mode and a hot air door climbing temperature rising mode, 4 modes of the mill group are flexibly scheduled under cold and hot working conditions, and the rate self-adaptive warm mill control is automatically completed.
Specifically, the formation process of the mill group warm mill starting time sequence based on statistics is as follows:
the method comprises the steps of establishing a sliding time window when the running number of a plurality of mill groups is increased by utilizing a historical data set of a unit milling system, taking the time when a coal mill outlet pneumatic plugboard door and a coal mill cold and hot primary air pneumatic plugboard door are in an opening state as a starting representation of the sliding time window and the time when the coal mill is started as an ending representation of the sliding time window, calculating a time difference delta t of the time window according to the starting time and the ending time of the sliding time window, taking the warm mill starting time recorded by the sliding time window as an effective warm mill opportunity when the delta t is smaller than a time threshold required by warm milling, generating a boundary condition of the warm mill opportunity when the running number of the current mill group is increased by using the starting time of the sliding time window, further taking the boundary condition as a constraint condition of a mill group warm mill opportunity prediction model when the running number of the same mill group is increased, and excavating the relation between the rising load and the mill group warm mill time.
Specifically, the mill group operation switching rule is as follows: according to the arrangement condition of 6 sets of grinding groups configured by a unit pulverizing system, carrying out block coding, respectively coding a (1), a (2) and a (3) on the lower layer, the middle layer and the upper layer of a front wall, respectively coding b (1), b (2) and b (3) on the lower layer, the middle layer and the upper layer of a rear wall, carrying out condition constraint on the starting priority of the grinding groups to generate a grinding group operation switching rule, wherein the running number of the front wall grinding groups is n, and the running number of the rear wall grinding groups is m. The mill group start priority constraints are as follows:
(1)a(1)>a(2)>a(3)；
(2)b(1)>b(2)>b(3)；
(3)a(1)>b(1)；
(4)a(2)>b(2)；
(5)a(3)>b(3)；
(6)|n-m|<2。
and 5.5, during the warm grinding period of the mill group, dividing cold and hot air adjusting doors of the coal mill into a cold air door positioning valve position mode, a cold air door climbing boosting mode, a hot air door positioning valve position mode and a hot air door climbing warming mode according to real-time operation data of the mill group, and simultaneously introducing a rising rate PID controller, a hot air door warm grinding PID controller and a cold air door warm grinding PID controller.
When the automatic warm grinding instruction of the grinding group is triggered, the calling of the cold and hot air door adjusting warm grinding full-control module of the coal mill is completed according to the following steps:
1) Entering a cold air valve positioning mode, and setting a cold air valve of the coal mill to a certain opening degree to perform cold air through flow of the coal mill;
2) Entering a cold air door climbing and boosting mode, generating a coal mill cold air door adjusting warm grinding instruction by a cold air door warm grinding PID controller, and automatically adjusting the outlet pressure of the coal mill;
3) Entering a hot air door fixed valve position mode, dividing a mill group warm grinding state into a cold state warm grinding state and a hot state warm grinding state according to the primary air temperature at the outlet of the unit air preheater, and then adjusting the hot air door of the coal mill to different opening degrees according to the mill group warm grinding state to pre-warm the mill group warm grinding;
4) Entering a hot air door climbing warming mode, wherein the rate-of-rise PID controller and the hot air door warm grinding PID controller simultaneously play a role in the mode, firstly calculating the temperature rise rate of the outlet temperature of the coal mill, limiting the actual temperature rise rate by utilizing an upper limit module and a lower limit module of the temperature rise rate, then automatically generating an outlet temperature set value when the coal mill is warm ground by utilizing the rate-of-rise PID controller, and finally generating a hot air door warm grinding instruction of the coal mill by utilizing the hot air door warm grinding PID controller to automatically adjust the outlet temperature of the coal mill.
The cold air door warm grinding PID controller is as follows: automatically adjusting without deviation according to the deviation of the outlet pressure of the coal mill and the set value of the hot milling air pressure of the coal mill to generate a cold air door adjusting and warm milling instruction of the coal mill;
the hot air door warm grinding PID controller is as follows: automatically adjusting without deviation according to the deviation between the outlet temperature of the coal mill and the set value of the outlet temperature of the coal mill to generate a hot air door-adjusting warm-grinding instruction of the coal mill;
the rising rate PID controller is as follows: the parameter proportion action coefficient in the rising rate PID controller is set to be 0, the integral time is set to be 60s, the rising rate PID controller is changed into an incremental PID with a pure integral effect, the input deviation is the temperature rise rate of the outlet of the coal mill after being limited by the upper limit and the lower limit of the temperature rise rate, when the actual temperature rise rate is in the limit range, the set value of the outlet temperature of the coal mill output by the rising rate PID controller is the actual temperature of the outlet of the coal mill, at the moment, the hot air door-regulating warm-grinding instruction of the coal mill is kept unchanged, when the actual temperature rise rate exceeds the upper limit of the temperature rise rate, the set value of the outlet temperature of the coal mill output by the rising rate PID controller is smaller than the actual temperature of the outlet of the coal mill, at the moment, the hot air door-regulating warm-grinding instruction of the coal mill is reduced, the temperature rise rate of the outlet temperature of the coal mill is reduced, when the actual temperature rise rate is smaller than the lower limit of the temperature rise rate, the set value of the outlet temperature of the coal mill output by the rising rate PID controller is larger than the actual temperature of the outlet of the coal mill, at the hot air door-regulating warm-grinding instruction of the coal mill is increased, and the outlet temperature rise rate is increased, and the outlet temperature rate of the coal mill is further increased.
The invention designs a speed-adaptive coal mill cold and hot air gate-regulating warm grinding full control module, which divides the control of the cold and hot air gates of a coal mill into a cold air gate positioning valve position mode, a cold air gate climbing and boosting mode, a hot air gate positioning valve position mode and a hot air gate climbing and warming mode, flexibly schedules 4 modes under cold and hot working conditions of a mill group, and automatically completes the mill group multi-working condition warm grinding control under wide load.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A one-key automatic warm grinding control method for a coal-fired unit is characterized by comprising the following steps:
step 1, judging whether a one-key automatic warm grinding function of a grinding set is put into use, if so, performing step 2, and if not, waiting in step 1;
step 2, calling a mill group warm mill starting time model;
step 3, calling a mill set warm mill starting sequence model according to the mill set warm mill starting time model;
step 4, outputting a mill set warm mill starting instruction according to the mill set warm mill starting time model and the mill set warm mill starting sequence model;
and 5, calling a warm mill starting sequential control function group according to the warm mill starting instruction of the mill group.
2. The coal-fired unit one-key automatic warm grinding control method according to claim 1, characterized in that the specific contents of step 2 are as follows:
firstly, calculating to obtain the average coal amount of the running mill groups according to the current total coal amount of the unit, the number of the running mill groups and the coal feeding offset, and meanwhile, calculating to obtain the boiler variable load feedforward when the unit carries out load increase of 10 MW-20 MW through the AGC rate of the unit, and estimating the dynamic coal amount; then, combining the upper limit of the coal quantity of the mill group to obtain the residual loading capacity of the unit under the current mill group; and finally, predicting the warm grinding starting time of the mill group by taking a sliding time window generated by the mill group warm grinding starting time sequence based on statistics as a boundary condition.
3. The coal-fired unit one-key automatic warm grinding control method according to claim 1 or 2, characterized in that the specific content of step 3 is as follows: the mill group operation switching rules are generated through the arrangement of the mill groups of the unit, the operation states of the mill groups are comprehensively considered, and the warm mill starting sequence of the mill groups is optimally sequenced.
4. The coal-fired unit one-key automatic warm grinding control method according to claim 1 or 2, characterized in that, in the step 5, the detailed steps for the coal-fired unit warm grinding start sequence control function group configured with the medium-speed direct-fired pulverizing system are as follows:
5.1, opening an electric inserting plate door at an outlet of the coal feeder, closing a pneumatic valve at an outlet of a pebble coal box of the coal mill, and opening a pneumatic valve at an inlet of the pebble coal box of the coal mill;
5.2, opening an electric inserting plate door at the inlet of the coal feeder and a sealing wind electric baffle of the coal mill;
5.3, opening a pneumatic inserting plate door at the outlet of the coal mill;
5.4, opening a cold and hot primary air pneumatic inserting plate door of the coal mill;
5.5, call coal pulverizer cold, hot-blast warm mill whole control module of adjusting a door: the control of cold and hot air adjusting doors of the coal mill is divided into a cold air door positioning valve position mode, a cold air door climbing pressure boosting mode, a hot air door positioning valve position mode and a hot air door climbing temperature rising mode, 4 modes of the mill group are flexibly scheduled under cold and hot working conditions, and the rate self-adaptive warm mill control is automatically completed.
5. The coal-fired unit one-key automatic warm grinding control method according to claim 2, characterized in that the formation process of the mill group warm grinding starting time sequence based on statistics is as follows:
the method comprises the steps of establishing a sliding time window when the running number of a plurality of mill groups is increased by utilizing a historical data set of a unit milling system, taking the time when a coal mill outlet pneumatic plugboard door and a coal mill cold and hot primary air pneumatic plugboard door are in an opening state as a starting representation of the sliding time window and the time when the coal mill is started as an ending representation of the sliding time window, calculating a time difference delta t of the time window according to the starting time and the ending time of the sliding time window, taking the warm mill starting time recorded by the sliding time window as an effective warm mill opportunity when the delta t is smaller than a time threshold required by warm milling, generating a boundary condition of the warm mill opportunity when the running number of the current mill group is increased by using the starting time of the sliding time window, further taking the boundary condition as a constraint condition of a mill group warm mill opportunity prediction model when the running number of the same mill group is increased, and excavating the relation between the rising load and the mill group warm mill time.
6. The coal-fired unit one-key automatic warm grinding control method as claimed in claim 3, wherein the grinding unit operation switching rule is as follows:
according to the arrangement condition of 6 sets of grinding groups configured by a unit pulverizing system, carrying out block coding, respectively coding a lower layer, a middle layer and an upper layer of a front wall into a (1), a (2) and a (3), respectively coding a lower layer, a middle layer and an upper layer of a rear wall into a b (1), a b (2) and a b (3), wherein the running number of the front wall grinding groups is n, the running number of the rear wall grinding groups is m, carrying out condition constraint on the starting priority of the grinding groups, and generating a grinding group running switching rule.
7. The coal-fired unit one-key automatic warm grinding control method as claimed in claim 6, characterized in that the grinding set start priority constraint conditions are as follows:
(1)a(1)>a(2)>a(3)；
(2)b(1)>b(2)>b(3)；
(3)a(1)>b(1)；
(4)a(2)>b(2)；
(5)a(3)>b(3)；
(6)|n-m|<2。
8. the one-key automatic warm-grinding control method for the coal-fired unit according to claim 4, characterized in that in step 5.5, during the warm-grinding period of the mill group, cold and hot air adjusting doors of the coal mill are divided into a cold air door positioning valve position mode, a cold air door climbing boosting mode, a hot air door positioning valve position mode and a hot air door climbing warming mode according to real-time operation data of the mill group, and a rising rate PID controller, a hot air door warm-grinding PID controller and a cold air door warm-grinding PID controller are introduced at the same time.
9. The coal-fired unit one-key automatic warm grinding control method according to claim 8, characterized in that when the mill group automatic warm grinding instruction is triggered, the calling of the coal mill cold and hot air door adjusting warm grinding full control module is completed according to the following steps:
1) Entering a cold air valve positioning mode, and setting a cold air valve of the coal mill to a certain opening degree to perform cold air through flow of the coal mill;
2) Entering a cold air door climbing and boosting mode, generating a coal mill cold air door adjusting warm grinding instruction by a cold air door warm grinding PID controller, and automatically adjusting the outlet pressure of the coal mill;
3) Entering a hot air door fixed valve position mode, dividing a mill group warm grinding state into a cold state warm grinding state and a hot state warm grinding state according to the primary air temperature at the outlet of the unit air preheater, and then adjusting the hot air door of the coal mill to different opening degrees according to the mill group warm grinding state to pre-warm the mill group warm grinding;
4) And entering a hot air door climbing temperature rising mode, wherein the speed rising rate PID controller and the hot air door warm grinding PID controller simultaneously play a role in the mode, firstly calculating the temperature rising rate of the outlet temperature of the coal mill, limiting the actual temperature rising rate by utilizing an upper temperature rising rate limit module and a lower temperature rising rate limit module, then automatically generating a set value of the outlet temperature of the coal mill during warm grinding by utilizing the speed rising rate PID controller, and finally generating a hot air door warm grinding instruction of the coal mill by utilizing the hot air door warm grinding PID controller to automatically adjust the outlet temperature of the coal mill.
10. The coal-fired unit one-key automatic warm grinding control method according to claim 9, characterized in that the cold air door warm grinding PID controller is: automatically adjusting without deviation according to the deviation of the outlet pressure of the coal mill and the set value of the hot milling air pressure of the coal mill to generate a cold air door adjusting and warm milling instruction of the coal mill;
the hot air door warm grinding PID controller is as follows: automatically adjusting without deviation according to the deviation between the outlet temperature of the coal mill and the set value of the outlet temperature of the coal mill to generate a hot air door-adjusting warm-grinding instruction of the coal mill;
the rising rate PID controller is as follows: the parameter proportion action coefficient in the rising rate PID controller is set to be 0, the integral time is set to be 60s, the rising rate PID controller is changed into an incremental PID with a pure integral effect, the input deviation is the temperature rise rate of the outlet of the coal mill after being limited by the upper limit and the lower limit of the temperature rise rate, when the actual temperature rise rate is in the limit range, the set value of the outlet temperature of the coal mill output by the rising rate PID controller is the actual temperature of the outlet of the coal mill, at the moment, the hot air door-regulating warm-grinding instruction of the coal mill is kept unchanged, when the actual temperature rise rate exceeds the upper limit of the temperature rise rate, the set value of the outlet temperature of the coal mill output by the rising rate PID controller is smaller than the actual temperature of the outlet of the coal mill, at the moment, the hot air door-regulating warm-grinding instruction of the coal mill is reduced, the temperature rise rate of the outlet temperature of the coal mill is reduced, when the actual temperature rise rate is smaller than the lower limit of the temperature rise rate, the set value of the outlet temperature of the coal mill output by the rising rate PID controller is larger than the actual temperature of the outlet of the coal mill, at the hot air door-regulating warm-grinding instruction of the coal mill is increased, and the outlet temperature rise rate is increased, and the outlet temperature rate of the coal mill is further increased.
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