CN115009801A - Double-rotation-speed measuring method for coal feeder - Google Patents

Double-rotation-speed measuring method for coal feeder Download PDF

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Publication number
CN115009801A
CN115009801A CN202210671051.1A CN202210671051A CN115009801A CN 115009801 A CN115009801 A CN 115009801A CN 202210671051 A CN202210671051 A CN 202210671051A CN 115009801 A CN115009801 A CN 115009801A
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Prior art keywords
rotating speed
probe
value
coal feeder
output
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CN202210671051.1A
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Chinese (zh)
Inventor
张晨
黄俊峰
张利军
刘大伟
杨帆华
马亮
费飞飞
尚昆民
霍金龙
缪鹏程
姚志祥
张保青
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Jiangsu Datang International Lvsigang Power Generation Co ltd
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Jiangsu Datang International Lvsigang Power Generation Co ltd
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Priority to CN202210671051.1A priority Critical patent/CN115009801A/en
Publication of CN115009801A publication Critical patent/CN115009801A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
    • B65G43/02—Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load carriers, e.g. for interrupting the drive in the event of overheating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/30—Belts or like endless load-carriers
    • B65G15/32—Belts or like endless load-carriers made of rubber or plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G35/00—Mechanical conveyors not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/04—Bulk
    • B65G2201/045—Sand, soil and mineral ore
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
    • B65G2203/02—Control or detection
    • B65G2203/0266—Control or detection relating to the load carrier(s)
    • B65G2203/0291—Speed of the load carrier
    • 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]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Conveyors (AREA)

Abstract

The invention discloses a double-rotation-speed measuring method for a coal feeder, which specifically comprises the following steps: step 1, respectively installing a rotating speed probe A and a rotating speed probe B on a motor protective cover of a coal feeder; step 2, carrying out speed and quality judgment on the rotating speed of the coal feeder measured by the rotating speed probe A, and outputting a corresponding rotating speed value V 1 (ii) a Step 3, judging the speed and the quality of the rotating speed measured by the rotating speed probe B, and outputting a corresponding rotating speed value V 2 (ii) a Step 4, calculating the instantaneous coal feeding amount W (t) of the coal feeder according to the rotating speed values output in the step 2 and the step 3; step 5, measuring values V of the A rotating speed probe and the B rotating speed probe 1 And V 2 And judging the bad value and the speed, and sending a tripping command of the coal feeder when the two measured values cannot be measured normally at the same time or the change rate exceeds a specified range at the same time. By adopting the method provided by the inventionThe coal quantity metering precision of the coal feeder can be guaranteed, and meanwhile, the running stability of the coal feeder when the rotating speed probe fails is also guaranteed.

Description

Double-rotation-speed measuring method for coal feeder
Technical Field
The invention belongs to the technical field of rotating speed measurement of coal feeders of power plants, and relates to a double-rotating-speed measurement method for a coal feeder.
Background
The measurement of feeder motor speed at present is single rotational speed measurement system, because the coal quality that present thermal power factory generally adopted is relatively poor, often can cause the motor to block, and motor speed is unstable this moment, and the motor speed error that single rotational speed measured is great. And what the coal feeder rotational speed measurement generally adopted at present is the magnetoelectric tachometer sensor, this sensor ubiquitous following problem when testing the speed: measurement errors are caused by the reduction of a magnetic field of the magnetoelectric sensor used for a long time, so that the vibration of a unit fuel adjusting loop is caused by the fluctuation of coal measurement; during normal work, motor vibration causes measurement faults caused by the fluctuation of the distance between the magnetoelectric sensor and the rotating gear, coal quantity of the coal feeder is lost, and the unit is forced to stop running the fault coal feeder. The problems not only cause large belt speed error at the calculation position and influence the metering precision of coal feeding quantity, but also can cause the severe consequences that a coal feeder is forced to stop operation and a unit is limited in load in severe cases.
Disclosure of Invention
The invention aims to provide a double-rotation-speed measuring method for a coal feeder, which can ensure the coal quantity measuring precision of the coal feeder and also ensure the running stability of the coal feeder when a rotation speed probe fails.
The technical scheme adopted by the invention is that the double-rotation-speed measuring method for the coal feeder specifically comprises the following steps:
step 1, respectively installing a rotating speed probe A and a rotating speed probe B on a motor protective cover of a coal feeder;
step 2, carrying out speed and quality judgment on the rotating speed of the coal feeder measured by the rotating speed probe A so as to judge whether the rotating speed probe A works normally or not and output a corresponding rotating speed value V 1 ；
Step 3, judging the speed and the quality of the rotating speed measured by the B rotating speed probe, thereby judging whether the B rotating speed probe works normally or not, and outputting a corresponding rotating speed value V 2 ；
Step 4, calculating the instantaneous coal feeding amount W (t) of the coal feeder according to the rotating speed values output in the step 2 and the step 3;
step 5, measuring values V of the A rotating speed probe and the B rotating speed probe 1 And V 2 And judging the bad value and the speed, and sending a tripping command of the coal feeder when the two measured values cannot be measured normally at the same time or the change rate exceeds a specified range at the same time.
The invention is also characterized in that:
in step 2, when the A rotating speed probe outputs the measured value and the change rate of the measured value is in the set range, the output value V is output 1 Is the measured value of A rotating speed probe, otherwise, the value V is output 1 The measured value of the probe of the B rotating speed is obtained; and confirming whether the A rotating speed probe has pulse rotating speed output or not through the Quality judging module Quality so as to confirm whether the A rotating speed probe normally works or not.
In step 3, when the probe of the B rotating speed outputs the measured value and the change rate of the measured value is in the set range, the probe of the B rotating speed outputs a value V 2 Is the measured value of the probe of the B rotating speed, otherwise, the value V is output 2 Is the measured value of the probe with the A rotating speed; confirming B rotating speed detection through a Quality judging module QualityWhether the probe outputs the pulse rotating speed or not is judged, so that whether the probe with the rotating speed B works normally or not is judged.
The specific process of the step 4 is as follows:
v output in step 1 is averaged by an averaging module AVG 1 And V output from step 2 2 Averaging to obtain an instantaneous belt speed V (t), and calculating an instantaneous coal feeding amount W (t) according to the instantaneous belt speed V (t) as shown in the following formula (1) and shown in the following formula (2):
V(t)＝(v 1 +v 2 )/2 (1)；
W(t)＝Q(t)×V(t) (2)；
in equation (2), Q (t) represents the weight of coal on the belt per instantaneous unit length.
The specific process of the step 5 is as follows: when the wiring of the A rotating speed probe is loosened or broken, no normal numerical value is output, the data channel Quality of the A rotating speed probe is considered to be a dead point, and the Quality output value is V 1 ；
If the B rotating speed probe has no output value, the Quality of the channel numerical value of the B rotating speed probe is proved to be a dead point, and the Quality output value is V 1 。
The double-rotating-speed measurement method for the coal feeder has the advantages that the coal quantity measurement precision of the coal feeder of the power plant is doubled, and the precision of automatic adjustment of boiler fuel is improved; after the double-rotating-speed measurement of the coal feeder is adopted, redundant rotating speed measurement is increased, the rotating speed which is inaccurate in measurement can be automatically eliminated, and the adverse consequences of forced shutdown of the coal feeder and limited load of a unit caused by inaccurate rotating speed measurement of the coal feeder are thoroughly avoided.
Drawings
FIG. 1 is a flow chart of the algorithm for the dual revolution measurement method of the coal feeder of the present invention;
FIG. 2 is a flow chart of the rotational speed and mass determination of the rotational speed probe A in the dual rotational speed measurement method for the coal feeder of the present invention;
FIG. 3 is a flow chart of the rotation speed and mass judgment of the B rotation speed probe in the double rotation speed measuring method for the coal feeder of the invention;
FIG. 4 is a flow chart of the continuous jump to the coal feeder during the measurement of the A rotating speed probe and the B rotating speed probe in the double rotating speed measurement method for the coal feeder of the invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a double-rotation-speed measuring method for a coal feeder, which specifically comprises the following steps of:
1. and (3) removing the single speed measuring probe installed on the protective housing of the motor of the existing coal feeder, and punching and installing two new speed measuring probes on the motor housing again. The stability of the probe can be improved by replacing the original cooling housing at the mounting position of the original measuring probe to the motor housing.
2. The internal measurement principle logic of the coal feeder is modified, the average of the measured values of the double speed measurement sensors is adopted during normal operation of the coal feeder, the average is then used for coal quantity calculation of the coal feeder, when the deviation of the measured values of the two speed measurement probes is large, the measured value with the large change rate of the measured value is automatically rejected to ensure the stability of the coal quantity, and an alarm is sent to inform a maintainer to timely overhaul the coal feeder.
The invention is used in the double-rotating-speed measuring method of the coal feeder, the logical algorithm adopted is shown as figure 1, in figure 1, V// H represents the rate judging module, when the change rate of the input number exceeds the set value, its output value is true; quality is a Quality judgment module, and when an input signal is lost due to various reasons, the output value is true; the AGV is an averaging module, and averages input values of the AGV; the T is a selection module, when an arrow point to T is true, the output value is a Y-path input value, and when the arrow point to T is false, the output value is an N-path input value;
the invention relates to a double-rotation-speed measuring method for a coal feeder, which mainly aims at measuring the rotation speed of a belt after an original single speed measuring probe of the coal feeder is changed into double speed measuring probes (an A rotation speed probe and a B rotation speed probe respectively), and specifically comprises the following steps:
step 1, as shown in fig. 2, the speed and quality of the rotation speed measured by the probe of the rotation speed a are judged, that is, when the probe of the rotation speed a has an output measurement value and the change rate of the measurement value is within a specified range, the output value V is 1 Is the measured value of A rotating speed probe, otherwise, the value V is output 1 The measured value of the probe of the B rotating speed is obtained; whether the A rotating speed probe outputs the pulse rotating speed or not is confirmed through the Quality judging module Quality, so that whether the A rotating speed probe normally works or not is confirmed, and when the Quality judging module Quality detects that the A rotating speed probe outputs the pulse rotating speed, the A rotating speed probe is considered to normally work;
step 2, as shown in fig. 3, performing speed and Quality judgment on the rotation speed measured by the B rotation speed probe (i.e. determining whether the B rotation speed probe has normal pulse rotation speed output by the Quality judgment module Quality, thereby determining whether the B rotation speed probe normally works, and when the Quality judgment module Quality detects that the B rotation speed probe has pulse rotation speed output, determining that the B rotation speed probe normally works), that is, when the B rotation speed side head has output measurement value and the change rate of the measurement value is within a specified range, outputting a value V 2 Is the measured value of the probe of B rotating speed, otherwise, the value V is output 2 Is the measured value of the probe with the A rotating speed;
step 3, the V output in the step 1 is processed by an averaging module AVG 1 And V output from step 2 2 Averaging to obtain an instantaneous belt speed V (t), and calculating an instantaneous coal feeding amount W (t) according to the instantaneous belt speed V (t) as shown in the following formula (1) and shown in the following formula (2):
V(t)＝(v 1 +v 2 )/2 (1)；
W(t)＝Q(t)×V(t) (2)。
in equation (2), Q (t) represents the weight of coal on the belt per instantaneous unit length.
Step 4, measuring values V of the A rotating speed probe and the B rotating speed probe 1 And V 2 Judging bad value and speed, when two measurement values can not be measured normally at the same time (namely, the output values of Quality modules behind the A rotating speed probe and the B rotating speed probe are both V 1 ) Or when the change rate exceeds the specified range, the coal feeder is jumped continuously (in figure 4, when two input values on the left side of AND are both V) 1 When the output value on the right side is V 1 (ii) a When the two input values to the left of OR are arbitrarily V 1 When the output value on the right side is V 1 (ii) a When the digital quantity module of the unit detects that the output value of OR is V 1 When in fact, directlyIssuing a feeder trip command).
Referring to fig. 4, when the connection of the a-speed probe is loose or broken, and there is no normal numerical output, the data channel Quality of the a-speed probe is considered to be a bad point, and the right side of the Quality module in fig. 4 outputs V 1 )
B, the rotating speed value measured by the speed measuring probe enters V// H for speed judgment, and if the changing speed of the rotating speed exceeds 30 r/m, the output value of the module is V 1 Similarly, if the B-speed probe has no output value, it is proved that the channel Quality of the B-speed probe is a bad point, and the Quality output value of fig. 4 is V 1 ；
In the steps 1 to 4, the specified range of the change rate of the measurement value is as follows: because the maximum load change rate of the unit is 1.5% Pe/min, namely the change rate of the rotating speed of each coal feeder does not exceed 1.5% theoretically, the maximum rotating speed of each coal feeder belt driving motor is 1500RPM, the change rate of the coal feeder is within a normal range of +/-1500 × 1.5% +/-22.5 r/min, and the limit value of the change rate is set to be 2% in consideration of the limit working condition, namely the change rate of the rotating speed of the coal feeder belt motor does not exceed 30 r/min).
The algorithm provided by the invention mainly aims to ensure the accuracy of coal quantity measurement of the coal feeder as far as possible on the premise of ensuring the operation stability of the coal feeder. When two rotating speed probes of the coal feeder are normally measured, the average value of the two speed measuring probes is adopted for measuring the belt speed in the coal quantity measurement, when one path of rotating side measurement value has a problem, the other path of non-fault rotating speed measurement data is automatically adopted for calculating the coal quantity of the coal feeder, and when two paths of rotating speed measurement values of the coal feeder simultaneously have a fault, the coal feeder is tripped.
The invention relates to a double-rotating-speed measuring method for a coal feeder, which adopts double probes to ensure that the rotating speed used for coal quantity calculation of the coal feeder has redundant data, adopts the average of the measured values of the double speed measuring sensors to participate in the coal quantity calculation of the coal feeder when the coal feeder operates normally, automatically rejects the measured value with high change rate of the measured values to ensure the stability of the coal quantity when the measured values of the two rotating speed probes have large deviation, and sends an alarm to inform a maintainer to overhaul the coal feeder in time. The accuracy of the rotation speed measurement of the coal feeder is improved, and meanwhile, the coal feeder can be stably operated instead of being stopped when one probe fails.

Claims (5)

1. The double-rotation-speed measuring method for the coal feeder is characterized in that: the method specifically comprises the following steps:
step 1, respectively mounting a rotating speed probe A and a rotating speed probe B on a motor protective cover of a coal feeder;
step 2, carrying out speed and quality judgment on the rotating speed of the coal feeder measured by the rotating speed probe A so as to judge whether the rotating speed probe A works normally or not and output a corresponding rotating speed value V 1 ；
Step 3, judging the speed and the quality of the rotating speed measured by the B rotating speed probe, thereby judging whether the B rotating speed probe works normally or not, and outputting a corresponding rotating speed value V 2 ；
Step 4, calculating the instantaneous coal feeding amount W (t) of the coal feeder according to the rotating speed values output in the step 2 and the step 3;
step 5, measuring values V of the A rotating speed probe and the B rotating speed probe 1 And V 2 And judging the bad value and the speed, and sending a tripping command of the coal feeder when the two measured values cannot be measured normally at the same time or the change rate exceeds a specified range at the same time.
2. The dual rotation rate measurement method for a coal feeder of claim 1, wherein: in the step 2, when the A rotating speed probe outputs the measured value and the change rate of the measured value is in the set range, the output value V is output 1 Is the measured value of A rotating speed probe, otherwise, the value V is output 1 The measured value of the probe of the B rotating speed is obtained; and confirming whether the A rotating speed probe outputs the pulse rotating speed or not through a Quality judging module Quality so as to confirm whether the A rotating speed probe works normally or not.
3. The dual rotation rate measurement method for a coal feeder of claim 2, wherein: in the step 3, when the probe of the B rotating speed outputs the measured value and the change rate of the measured value is in the set range, the output value is outputV 2 Is the measured value of the probe of the B rotating speed, otherwise, the value V is output 2 Is the measured value of the probe with the A rotating speed; and confirming whether the B rotating speed probe has pulse rotating speed output or not through the Quality judging module Quality so as to confirm whether the B rotating speed probe normally works or not.
4. The dual rotation rate measurement method for a coal feeder of claim 3, wherein: the specific process of the step 4 is as follows:
v output in step 1 is averaged by AVG 1 And V output from step 2 2 Averaging to obtain an instantaneous belt speed V (t), and calculating an instantaneous coal feeding amount W (t) according to the instantaneous belt speed V (t) as shown in the following formula (1) and shown in the following formula (2):
V(t)＝(v 1 +v 2 )/2 (1)；
W(t)＝Q(t)×V(t) (2)；
in equation (2), Q (t) represents the weight of coal on the belt per instantaneous unit length.
5. The dual rotation rate measurement method for a coal feeder of claim 3, wherein: the specific process of the step 5 is as follows: when the connection of the A rotating speed probe is loose or broken, no normal numerical value is output, the data channel Quality of the A rotating speed probe is considered to be a dead point, and the Quality output value is V 1 ；
If the probe of the B rotating speed has no output value, the Quality of the channel numerical value of the probe of the B rotating speed is proved to be a dead point, and the Quality output value is V 1 。
CN202210671051.1A 2022-06-14 2022-06-14 Double-rotation-speed measuring method for coal feeder Pending CN115009801A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203079306U (en) * 2013-03-04 2013-07-24 新乡市中鑫机械设备有限公司 Special double-push-rod device for reciprocating coal feeder
CN104444256A (en) * 2014-10-27 2015-03-25 中国神华能源股份有限公司 Control method and system used for weighing-type belt coal feeder
CN112255975A (en) * 2020-09-17 2021-01-22 无锡利信能源科技有限公司 Coal feeding rate control method of coal feeder based on DCS platform
CN113086553A (en) * 2021-02-22 2021-07-09 大唐七台河发电有限责任公司 Coal amount calculating and controlling system for coal feeder of thermal power plant
CN215931927U (en) * 2021-08-05 2022-03-01 华能国际电力股份有限公司丹东电厂 Speed measuring device for coal feeder
CN114229385A (en) * 2022-01-18 2022-03-25 华能铜川照金煤电有限公司 Method and device for outputting rotating speed of coal feeder of thermal power plant based on double rotating speed sensors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203079306U (en) * 2013-03-04 2013-07-24 新乡市中鑫机械设备有限公司 Special double-push-rod device for reciprocating coal feeder
CN104444256A (en) * 2014-10-27 2015-03-25 中国神华能源股份有限公司 Control method and system used for weighing-type belt coal feeder
CN112255975A (en) * 2020-09-17 2021-01-22 无锡利信能源科技有限公司 Coal feeding rate control method of coal feeder based on DCS platform
CN113086553A (en) * 2021-02-22 2021-07-09 大唐七台河发电有限责任公司 Coal amount calculating and controlling system for coal feeder of thermal power plant
CN215931927U (en) * 2021-08-05 2022-03-01 华能国际电力股份有限公司丹东电厂 Speed measuring device for coal feeder
CN114229385A (en) * 2022-01-18 2022-03-25 华能铜川照金煤电有限公司 Method and device for outputting rotating speed of coal feeder of thermal power plant based on double rotating speed sensors

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