CN112082172B - Coal pulverizing and feeding control system for boiler of thermal power plant and control method thereof - Google Patents
Coal pulverizing and feeding control system for boiler of thermal power plant and control method thereof Download PDFInfo
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- CN112082172B CN112082172B CN202010771127.9A CN202010771127A CN112082172B CN 112082172 B CN112082172 B CN 112082172B CN 202010771127 A CN202010771127 A CN 202010771127A CN 112082172 B CN112082172 B CN 112082172B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/005—Regulating fuel supply using electrical or electromechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2203/00—Feeding arrangements
- F23K2203/10—Supply line fittings
- F23K2203/104—Metering 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
- 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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Abstract
The invention discloses a coal pulverizing and feeding control system and a control method thereof for a boiler of a thermal power plant, wherein the system comprises the following steps: the power supply unit is used for providing power supply; the sensor detection unit is used for weighing a load and detecting the state of each link of the system; the control unit is responsible for performing algorithm processing according to signals provided by the sensor detection unit, automatically adjusting parameters according to preset requirements, providing optimized control load operation conditions, and simultaneously transmitting main data of operation, equipment state and alarm information to the display unit; the driving unit is responsible for receiving the control unit instruction and driving the load to operate, and feeds back the driving unit state to the control unit, and the display unit is responsible for displaying parameters, equipment state, alarm information, data storage, data query, operation record registration and query in the equipment operation process output by the control unit. The stability of the scheme is improved, the failure rate is reduced, and the personnel maintenance cost and the hardware configuration are also reduced.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a coal pulverizing and feeding control system for a boiler of a thermal power plant.
Background
The coal feeder control system is mainly applied to a coal-fired boiler pulverizing system of a thermal power plant, and has the main functions of adjusting the coal feeding amount according to the load requirements of a coal mill or a boiler and uniformly feeding raw coal into the coal mill to enable the fuel to be more matched with the required air amount. The coal feeder system can continuously feed coal, is accurate in weighing, stable in work, energy-saving and efficient, and is main metering coal feeding equipment matched with a coal mill in a coal-fired boiler pulverizing system. At present, a coal feeder control system of a domestic thermal power plant mainly adopts a mode of a packaging circuit board or an integrating instrument matched with an electric loop and the like, and as the technology is relatively early, a plurality of functions can not meet the actual requirements on site, and the problem is relatively outstanding.
The main problems of the prior art are as follows: 1. the control system is easy to malfunction, trip and shut down, and the fault is difficult to find; 2. the control system adopts a curing mode, cannot modify control according to specific process change, is inflexible and has poor expansibility; 3. the control system has limited alarm information, can not accurately determine the fault reason, and increases the difficulty of elimination. 4. The human-computer interface of the control system is simple, and the state and the parameters of the equipment cannot be accurately indicated.
Disclosure of Invention
Aiming at the situation of the prior art, the invention aims to provide a coal pulverizing and feeding control system of a boiler of a thermal power plant and a control method thereof, which are safe, reliable, flexible to implement and high in efficiency.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
boiler powder process coal feed control system of thermal power plant, it includes:
the power supply unit is used for providing power supply;
the sensor detection unit comprises a weighing sensor, a speed measurement sensor, a positioning sensor, a current sensor and a frequency sensor; the weighing sensors are more than two and are jointly responsible for detecting the effective weight of a weighing object on the belt and transmitting the effective weight to the control unit; the speed measuring sensor is responsible for detecting high-speed pulses sent by the coal feeding motor and outputting a rotating speed signal of the coal feeding motor to the control unit; the scale sensor is responsible for detecting the effective pulse number of the tare weighing span and transmitting the signal to the control unit; the frequency sensor is responsible for detecting the running frequency of a frequency converter driving a load and outputting a rotating speed signal of the frequency converter to the control unit;
the control unit is responsible for performing algorithm processing according to signals provided by the sensor detection unit, automatically adjusting parameters according to preset requirements, providing optimized control load operation conditions, and simultaneously transmitting main data of operation, equipment state and alarm information to the display unit;
the driving unit is responsible for receiving the instruction of the control unit, driving the load to run and feeding back the state of the driving unit to the control unit,
and the display unit is responsible for displaying parameters, equipment states, alarm information, data storage, data query, operation record registration and query in the equipment operation process output by the control unit.
As a preferred implementation mode, further, the number of the weighing sensors is two, and weighing carrier rollers for bearing the belt are hung on the two weighing sensors, so that the effective weight of a weighing object on the belt is jointly detected.
As a preferred embodiment, further, the sensor detection unit further includes:
the coal sensor is responsible for detecting the state of the belt coal and transmitting a state signal to the control unit;
the coal blockage sensor is responsible for detecting the state of coal at the conveying outlet of the equipment and transmitting a state signal to the control unit;
and the current sensor is responsible for detecting the operating current of the load and transmitting the operating current to the control unit.
As a preferred embodiment, further, the control unit algorithm process comprises:
the main program is responsible for starting and stopping the equipment control load and judging the operating conditions;
the screen key processing program is responsible for the personnel with different authorities and has control modes with different authorities;
a speed and weight processing program for calculating the instantaneous speed and filtering the weighing signal;
the instantaneous weight and real-time flow calculation program is responsible for calculating the instantaneous weight and calculating the real-time flow according to the instantaneous speed;
the constant flow program is responsible for automatically adjusting the load speed according to the operation requirement so as to meet the constant flow requirement;
a coal quantity accumulation program responsible for calculating the total coal weight accumulated during the operation of the equipment;
the alarm system program is responsible for fault alarm and fault pre-alarm in the system operation process;
and the checking program is responsible for automatically calculating the tare weight of the belt and the linear relation between the weight and the weighing signal.
As a preferred embodiment, further, the driving unit adopts a three-phase frequency converter, and the power is configured according to the actual load.
The control method of the coal pulverizing and feeding control system of the boiler of the thermal power plant comprises the following steps:
step 2, obtaining the tare weight and the measuring range corresponding to each weighing sensor according to the checking process, and calculating the instantaneous weight of each weighing sensor;
step 3, judging whether the weighing signals of all the weighing sensors are effective or not; if so, accumulating the instantaneous weights of all the weighing sensors as the current effective weight G, and storing the effective weight G as a buffer weight G0; otherwise, taking the buffer memory weight G0 as the current effective weight G, wherein G0 is the buffer memory weight data before 30 seconds;
step 4, acquiring the coal feeding motor rotating speed V1 sensed by a speed measuring sensor and a frequency converter rotating speed signal V2 sensed by a frequency sensor; and only when the motor rotating speed V1 is 0, the frequency converter rotating speed signal V2 is taken as the effective speed V; otherwise, taking the rotating speed V1 of the coal feeding motor as an effective speed;
step 5, calculating the instantaneous coal feeding rate F = G V according to the effective weight G and the effective speed V,
step 6, obtaining the coal feeding rate F requested by the superior system 0 And automatically adjusting the load speed according to the actual coal feed rate to output an adjustment signal, AO n ＝AO n-1 +Kp*(F 0 -F)/F 0 Wherein AO n Indicating the load speed regulation output, AO, at this moment n-1 Representing the load speed regulation output at the previous time, kp representing a proportional parameter, F 0 Representing the coal feeding rate requested by the superior system, and F representing the current instantaneous coal feeding rate;
step 7, the driving unit obtains the automatic adjusting signal and carries out speed and frequency regulation by the frequency converter, and simultaneously feeds back a rotating speed signal V2 of the frequency converter to the control unit,
and 8, driving the field load coal feeding motor to act by the frequency converter after speed regulation and frequency conversion, and simultaneously feeding back a rotating speed signal V1 of the load coal feeding motor to the control unit.
As a preferred embodiment, further, in step 1, the weighing signals of the two weighing sensors are acquired and obtained, which are respectively a weighing signal P1 and a weighing signal P2.
As a preferred embodiment, further, in step 2, the instantaneous weight G1= (P1-P01) = K1 corresponding to the weighing signal P1 and the instantaneous weight G2= (P2-P02) × K2 corresponding to the weighing signal P2 are calculated according to the tare P01 and the range K1 corresponding to the weighing signal P1 and the tare P02 and the range K2 corresponding to the weighing signal P2 obtained in the verification process. As a preferred embodiment, the validity of the weighing signal 1 (P1) and the weighing signal 2 (P2) is further determined in step 3, and when P1> P1max or P1< P1min or | P1-P2| >200 is considered invalid, otherwise it is valid, P1max represents the maximum value of the range parameter corresponding to the weighing signal P1, and P1min represents the minimum value of the range parameter corresponding to the weighing signal P1. The judgment of P2 is similar to P1, and is considered as invalid when P2> P2max or P2< P2min or | P1-P2| is >200, otherwise, the result is valid, P2max represents the maximum value of the range parameter corresponding to the weighing signal P2, and P2min represents the minimum value of the range parameter corresponding to the weighing signal P2. When both weighing signal P1 and weighing signal P2 are active, the active weight G = G1+ G2, while the buffer weight G0= G; if both of the weighing signals P1 and P2 are invalid, the effective weight G = G0, and G0 is data 30 seconds ago. Pmax represents the maximum value of the range parameter setting, and Pmin represents the minimum value of the range parameter setting.
By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: 1. the system stability is improved, and the times of unknown trip are reduced; 2. the universal component is adopted, the control logic is allowed to be modified, the flexibility is good, and the universality expansibility is strong; 3. by adopting various Chinese alarm information, the fault cause can be accurately determined, and the maintenance difficulty is reduced; 4. and the large screen display is adopted, so that the equipment parameter detection is more visual, and the equipment monitoring and maintenance are facilitated.
The system of the invention provides a plurality of fault pre-judging algorithms, is convenient for fault finding, has simple fault prompt and is provided with a fault solution. The system adopts standard electrical components, the maintainability of the components is good, one component is damaged, because the components are standard products, corresponding replacement is enough, and the maintenance personnel can operate without influencing the whole system. The system stability is increased, the failure rate is reduced, and the personnel maintenance cost and the hardware configuration are also reduced.
Drawings
The scheme of the invention is further explained by combining the attached drawings and the detailed embodiment:
FIG. 1 is a schematic diagram of the connections of a control system in accordance with aspects of the present invention;
fig. 2 is a flow chart illustrating a control method according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the coal pulverizing and feeding control system of the boiler of the thermal power plant of the present invention comprises:
the power supply unit is used for providing power supply;
the sensor detection unit comprises a weighing sensor, a speed measurement sensor, a positioning sensor, a current sensor and a frequency sensor; the weighing sensors are more than two and are jointly responsible for detecting the effective weight of a weighing object on the belt and transmitting the effective weight to the control unit; the speed measuring sensor is responsible for detecting high-speed pulses sent by the coal feeding motor and outputting a rotating speed signal of the coal feeding motor to the control unit; the scale sensor is responsible for detecting the effective pulse number of the tare weighing span and transmitting the signal to the control unit; the frequency sensor is responsible for detecting the running frequency of a frequency converter driving a load and outputting a rotating speed signal of the frequency converter to the control unit;
the control unit is responsible for performing algorithm processing according to signals provided by the sensor detection unit, automatically adjusting parameters according to preset requirements, providing optimized control load operation conditions, and simultaneously transmitting main data of operation, equipment state and alarm information to the display unit;
the driving unit is responsible for receiving the instruction of the control unit, driving the load to run and feeding back the state of the driving unit to the control unit,
and the display unit is responsible for displaying parameters, equipment states, alarm information, data storage, data inquiry, operation record registration and inquiry in the equipment operation process output by the control unit.
As a preferred implementation mode, further, the number of the weighing sensors is two, and weighing carrier rollers for bearing the belt are hung on the two weighing sensors, so that the effective weight of a weighing object on the belt is jointly detected.
As a preferred embodiment, further, the sensor detection unit further includes:
the coal sensor is responsible for detecting the state of the belt coal and transmitting a state signal to the control unit;
the coal blockage sensor is responsible for detecting the state of coal at the conveying outlet of the equipment and transmitting a state signal to the control unit;
and the current sensor is responsible for detecting the operating current of the load and transmitting the operating current to the control unit.
As a preferred embodiment, further, the control unit algorithm process comprises:
the main program is responsible for starting and stopping the equipment control load and judging the operating conditions;
the screen key processing program is responsible for the personnel with different authorities and has control modes with different authorities;
a speed and weight processing program for calculating the instantaneous speed and filtering the weighing signal;
the instantaneous weight and real-time flow calculation program is responsible for calculating the instantaneous weight and calculating the real-time flow according to the instantaneous speed;
the constant flow program is responsible for automatically adjusting the load speed according to the operation requirement so as to meet the constant flow requirement;
a coal quantity accumulation program for calculating the total coal weight accumulated during the operation period of the equipment;
the alarm system program is responsible for fault alarm and fault pre-alarm in the system operation process;
and the checking program is responsible for automatically calculating the tare weight of the belt and the linear relation between the weight and the weighing signal.
As a preferred embodiment, further, the driving unit adopts a three-phase frequency converter, and the power is configured according to the actual load.
As shown in fig. 2, the invention also discloses a control method of the coal pulverizing and feeding control system of the boiler of the thermal power plant, which comprises the following steps:
step 2, obtaining the tare weight and the measuring range corresponding to each weighing sensor according to the checking process, and calculating the instantaneous weight of each weighing sensor;
step 3, judging whether the weighing signals of all the weighing sensors are effective or not; if so, accumulating the instantaneous weights of all the weighing sensors as the current effective weight G, and storing the effective weight G as a buffer weight G0; otherwise, taking the buffer memory weight G0 as the current effective weight G, wherein G0 is the buffer memory weight data before 30 seconds;
step 4, acquiring the coal feeding motor rotating speed V1 sensed by a speed measuring sensor and a frequency converter rotating speed signal V2 sensed by a frequency sensor; and only when the motor rotating speed V1 is 0, the frequency converter rotating speed signal V2 is taken as the effective speed V; otherwise, taking the rotating speed V1 of the coal feeding motor as an effective speed;
step 5, calculating the instantaneous coal feeding rate F = G V according to the effective weight G and the effective speed V,
step 6, obtaining the coal feeding rate F requested by the superior system 0 And automatically adjusting the load speed according to the actual coal feed rate to output an adjustment signal, AO n ＝AO n-1 +Kp*(F 0 -F)/F 0 Wherein AO n Indicating the load speed regulation output, AO, at this moment n-1 Representing the load speed regulation output at the previous moment, kp representing a proportional parameter, F 0 Representing the coal feeding rate requested by the superior system, and F representing the current instantaneous coal feeding rate;
step 7, the driving unit obtains the automatic adjusting signal and carries out speed and frequency regulation by the frequency converter, and simultaneously feeds back a rotating speed signal V2 of the frequency converter to the control unit,
and 8, driving the field load coal feeding motor to act by the frequency converter after speed regulation and frequency conversion, and simultaneously feeding back a rotating speed signal V1 of the load coal feeding motor to the control unit.
As a preferred embodiment, further, in step 1, the weighing signals of the two weighing sensors are acquired and obtained, which are respectively a weighing signal P1 and a weighing signal P2.
As a preferred embodiment, in step 2, the instantaneous weight G1= (P1-P01) × K1 corresponding to the weighing signal P1 and the instantaneous weight G2= (P2-P02) × K2 corresponding to the weighing signal P2 are calculated according to the tare weight P01 and the measuring range K1 corresponding to the weighing signal P1 and the tare weight P02 and the measuring range K2 corresponding to the weighing signal P2 obtained in the verification process. As a preferred embodiment, the validity of the weighing signal 1 (P1) and the weighing signal 2 (P2) is further determined in step 3, and when P1> P1max or P1< P1min or | P1-P2| >200 is considered invalid, otherwise it is valid, P1max represents the maximum value of the range parameter corresponding to the weighing signal P1, and P1min represents the minimum value of the range parameter corresponding to the weighing signal P1. The judgment of P2 is similar to P1, and is considered as invalid when P2> P2max or P2< P2min or | P1-P2| >200, otherwise, is valid, P2max represents the maximum value of the range parameter corresponding to the weighing signal P2, and P2min represents the minimum value of the range parameter corresponding to the weighing signal P2. When both weighing signal P1 and weighing signal P2 are active, the active weight G = G1+ G2, while the buffer weight G0= G; if both of the weighing signals P1 and P2 are invalid, the effective weight G = G0, and G0 is data 30 seconds ago. Pmax represents the maximum value of the range parameter setting, and Pmin represents the minimum value of the range parameter setting.
By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: 1. the system stability is improved, and the times of unknown trip are reduced; 2. the universal component is adopted, the control logic is allowed to be modified, the flexibility is good, and the universality expansibility is strong; 3. by adopting various Chinese alarm information, the fault cause can be accurately determined, and the maintenance difficulty is reduced; 4. and the large screen display is adopted, so that the equipment parameter detection is more visual, and the equipment monitoring and maintenance are facilitated.
The system of the invention provides a plurality of fault pre-judging algorithms, is convenient for fault finding, has simple fault prompt and is provided with a fault solution. The system adopts standard electrical components, the maintainability of the components is good, one component is damaged, because the components are standard products, corresponding replacement is enough, and the maintenance personnel can operate without influencing the whole system. The system stability is increased, the failure rate is reduced, and the personnel maintenance cost and the hardware configuration are also reduced.
The foregoing is directed to embodiments of the present invention, and equivalents, modifications, substitutions and variations such as will occur to those skilled in the art, which fall within the scope and spirit of the appended claims.
Claims (8)
1. The control method of the coal pulverizing and feeding control system of the boiler of the thermal power plant adopts the coal pulverizing and feeding control system of the boiler of the thermal power plant, and is characterized in that: the coal supply control system for coal pulverizing of the boiler of the thermal power plant comprises:
the power supply unit is used for providing power supply;
the sensor detection unit comprises a weighing sensor, a speed measurement sensor, a fixed-degree sensor, a current sensor and a frequency sensor; the weighing sensors are more than two and are jointly responsible for detecting the effective weight of a weighing object on the belt and transmitting the effective weight to the control unit; the speed measuring sensor is responsible for detecting high-speed pulses sent by the coal feeding motor and outputting a rotating speed signal of the coal feeding motor to the control unit; the scale sensor is responsible for detecting the effective pulse number of the tare weighing span and transmitting the signal to the control unit; the frequency sensor is responsible for detecting the running frequency of a frequency converter driving a load and outputting a rotating speed signal of the frequency converter to the control unit;
the control unit is responsible for performing algorithm processing according to signals provided by the sensor detection unit, automatically adjusting parameters according to preset requirements, providing optimized control load operation conditions, and simultaneously transmitting main data of operation, equipment state and alarm information to the display unit;
the driving unit is responsible for receiving the instruction of the control unit, driving the load to run and feeding back the state of the driving unit to the control unit, and the display unit is responsible for displaying parameters, equipment state, alarm information, data storage, data query, operation record registration and query in the equipment running process output by the control unit;
the method comprises the following steps:
step 1, respectively acquiring weighing signals of two weighing sensors;
step 2, obtaining the tare weight and the measuring range corresponding to each weighing sensor according to the checking process, and calculating the instantaneous weight of each weighing sensor;
step 3, judging whether the weighing signals of all the weighing sensors are effective or not; if so, accumulating the instantaneous weights of all the weighing sensors as the current effective weight G, and storing the effective weight G as a buffer weight G0; otherwise, taking the buffer memory weight G0 as the current effective weight G, wherein G0 is the buffer memory weight data before 30 seconds;
step 4, acquiring the coal feeding motor rotating speed V1 sensed by a speed measuring sensor and a frequency converter rotating speed signal V2 sensed by a frequency sensor; and only when the rotating speed V1 of the motor is 0, the rotating speed signal V2 of the frequency converter is taken as the effective speed V; otherwise, taking the rotating speed V1 of the coal feeding motor as an effective speed;
step 5, calculating the instantaneous coal feeding rate F = G V according to the effective weight G and the effective speed V,
step 6, acquiring a coal feeding rate F0 requested by a superior system, automatically adjusting the load speed according to the actual coal feeding rate and outputting an adjusting signal, wherein AOn = AOn-1+ Kp (F0-F)/F0, AOn represents the load speed adjusting output at the moment, AOn-1 represents the load speed adjusting output at the last moment, kp represents a proportional parameter, F0 represents the coal feeding rate requested by the superior system, and F represents the current instantaneous coal feeding rate;
step 7, the driving unit obtains the automatic adjusting signal and carries out speed and frequency regulation by the frequency converter, and simultaneously feeds back a rotating speed signal V2 of the frequency converter to the control unit,
and 8, driving the field load coal feeding motor to act by the frequency converter after speed regulation and frequency conversion, and simultaneously feeding back a rotating speed signal V1 of the load coal feeding motor to the control unit.
2. The control method of the coal pulverizing and feeding control system of the boiler of the thermal power plant according to claim 1, characterized in that: the weighing sensors are two, and weighing carrier rollers for bearing the belt are hung on the two weighing sensors, so that the effective weight of a weighing object on the belt is jointly detected.
3. The control method of the coal pulverizing and feeding control system of the boiler of the thermal power plant according to claim 1, characterized in that: the sensor detection unit further includes:
the coal sensor is responsible for detecting the state of the belt coal and transmitting a state signal to the control unit;
the coal blockage sensor is responsible for detecting the state of coal at the conveying outlet of the equipment and transmitting a state signal to the control unit;
and the current sensor is used for detecting the operating current of the load and transmitting the operating current to the control unit.
4. The control method of the coal pulverizing and feeding control system of the boiler of the thermal power plant according to claim 1, characterized in that: the control unit algorithm processing comprises the following steps:
the main program is responsible for starting and stopping the equipment control load and judging the operating conditions;
the screen key processing program is responsible for the personnel with different authorities and has control modes with different authorities;
a speed and weight processing program for calculating the instantaneous speed and filtering the weighing signal;
the instantaneous weight and real-time flow calculation program is responsible for calculating the instantaneous weight and calculating the real-time flow according to the instantaneous speed;
the constant flow program is responsible for automatically adjusting the load speed according to the operation requirement so as to meet the constant flow requirement;
a coal quantity accumulation program for calculating the total coal weight accumulated during the operation period of the equipment;
the alarm system program is responsible for fault alarm and fault pre-alarm in the system operation process;
and the checking program is responsible for automatically calculating the tare weight of the belt and the linear relation between the weight and the weighing signal.
5. The control method of the coal pulverizing and feeding control system of the boiler of the thermal power plant according to claim 1, characterized in that: the driving unit adopts a three-phase frequency converter, and the power is configured according to the actual load.
6. The control method of the coal pulverizing and feeding control system of the boiler of the thermal power plant according to claim 1, characterized in that: in the step 1, weighing signals of two weighing sensors are acquired and obtained, namely a weighing signal P1 and a weighing signal P2.
7. The control method of the coal pulverizing and feeding control system of the boiler of the thermal power plant according to claim 6, characterized in that: in step 2, according to the tare weight P01 and the range K1 corresponding to the weighing signal P1 and the tare weight P02 and the range K2 corresponding to the weighing signal P2 obtained in the verification process, the instantaneous weight G1= (P1-P01) × K1 corresponding to the weighing signal P1 and the instantaneous weight G2= (P2-P02) × K2 corresponding to the weighing signal P2 are calculated.
8. The control method of the coal pulverizing and feeding control system of the boiler of the thermal power plant according to claim 7, characterized in that: step 3, respectively judging whether the weighing signal P1 and the weighing signal P2 are both effective or not;
when P1 is greater than P1max or P1< P1min or | P1-P2| is greater than 200, the weighing signal is regarded as invalid, otherwise the weighing signal is valid, P1max represents the maximum value of the range parameter corresponding to the weighing signal P1, and P1min represents the minimum value of the range parameter corresponding to the weighing signal P1;
when P2> P2max or P2< P2min or | P1-P2| is >200, the weighing signal is regarded as invalid, otherwise the weighing signal is valid, P2max represents the maximum value of the range parameter corresponding to the weighing signal P2, and P2min represents the minimum value of the range parameter corresponding to the weighing signal P2;
when both weighing signal P1 and weighing signal P2 are active, the active weight G = G1+ G2, while the buffer weight G0= G; if both of the weighing signals P1 and P2 are invalid, the effective weight G = G0, and G0 is data 30 seconds ago.
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| 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 |
| CN206387492U (en) * | 2016-08-26 | 2017-08-08 | 华润电力（菏泽）有限公司 | A kind of weighing-up wave Transmission system of feeder |
| CN109959438A (en) * | 2017-12-14 | 2019-07-02 | 湖南中联重科混凝土机械站类设备有限公司 | Weighing control method, apparatus and material weighing system |
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