CN111396919A - Unit unit control system and method based on real-time online analysis of coal quality - Google Patents
Unit unit control system and method based on real-time online analysis of coal quality Download PDFInfo
- Publication number
- CN111396919A CN111396919A CN202010312610.0A CN202010312610A CN111396919A CN 111396919 A CN111396919 A CN 111396919A CN 202010312610 A CN202010312610 A CN 202010312610A CN 111396919 A CN111396919 A CN 111396919A
- Authority
- CN
- China
- Prior art keywords
- coal
- air
- real
- feeder
- calorific value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 296
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012937 correction Methods 0.000 claims description 61
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 33
- 238000002485 combustion reaction Methods 0.000 claims description 33
- 239000001301 oxygen Substances 0.000 claims description 33
- 229910052760 oxygen Inorganic materials 0.000 claims description 33
- 238000012544 monitoring process Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 20
- 238000005303 weighing Methods 0.000 claims description 20
- 238000004364 calculation method Methods 0.000 claims description 15
- 230000004044 response Effects 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract description 14
- 230000003111 delayed effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a unit control system and a unit control method based on real-time online analysis of coal quality. According to the method, accurate fuel and air distribution of the thermal power generating unit are realized on the basis of the available on-line data of the coal as fired, which meet the real-time operation control requirements, and the practical value is obvious.
Description
Technical Field
The invention belongs to the technical field of automatic control of thermal power stations, and particularly relates to a unit control system and method based on real-time on-line analysis of coal quality.
Background
At present, the condition that the coal quality and even the coal type frequently and greatly change commonly exists in thermal power generating units in China, and the process control of the thermal power generating units, particularly the setting of key parameters of fuel and air distribution systems, is seriously influenced by the lag of coal quality measurement.
In the existing coordinated control of thermal power unit units, a simple closed-loop control is generally adopted for thermal value correction of a fuel system, the actual total coal quantity is multiplied by a thermal value correction coefficient to obtain a corrected coal quantity which is used as a regulated quantity, a standard coal quantity corresponding to a unit load is used as a set value, the corrected coal quantity and the standard coal quantity are sent to a PID (proportion integration differentiation) controller, the corrected coal quantity is made to approach the standard coal quantity corresponding to the load through deviation adjustment, and in the process, the thermal value correction coefficient is gradually corrected to meet the fuel requirements under each load, as shown in figure 1.
In traditional combustion control, also adopt similar control thinking to the oxygen volume correction of air distribution link, the corresponding economizer export flue gas oxygen content that adopts of transferred volume through the PID controller, tracks the different oxygen volume setting values under each load to try to make up an oxygen volume correction coefficient that accords with actual oxygen volume demand, as shown in fig. 2.
The above control process has the following problems:
1. the correction instantaneity is poor. In the heat value correction, because the fuel is fully combusted in the hearth and enters the steam turbine to do work, the process is delayed greatly, and the fuel quantity as the adjusted quantity is delayed to the load of the unit, and the real-time deviation is an unavoidable problem when the adjustment is carried out based on the fuel quantity and the adjusted quantity. In the oxygen amount correction, the oxygen content of the flue gas at the outlet of the economizer is used as the adjusted amount, the combustion process generating the obtained oxygen amount value is ended early at the measuring moment, and the combustion process is a serious lagging control process for the air distribution of the boiler.
2. The correction matching is poor. The condition that the correction real-time performance is poor is that a correction parameter obtained at one moment is corrected in the operation process at the other moment, so that the coal feeding and air distribution matching degree of a control system is not good, and the actual operation deviates from the optimal fuel requirement and air-coal ratio. This, in addition to the hysteresis and inaccuracy of oxygen measurement, also compromises the effectiveness of the oxygen correction.
3. The continuous fluctuation is corrected. The fuel and air distribution ratio in the real-time operation process is not proper, so that the vicious expansion of deviation in the actual process can be possibly caused, the correction coefficient can fluctuate along with the fuel and air distribution ratio for a long time, and the rapid stability is difficult.
4. Influence on other indices. The fuel and the air distribution are important factors in the coordination of the unit and the combustion process of the boiler, the accuracy and the stability of the fuel and the air distribution have obvious influence on key parameters of the unit, such as main steam pressure, main steam temperature and the like, and important indexes, such as variable load capacity of the unit and the like, and the influence on denitration environmental protection indexes is inevitable.
In summary, under the actual conditions of coal quality fluctuation and coal quality measurement lag of the thermal power generating unit in China, the control logic of the traditional coordination system and the combustion system cannot fundamentally realize real-time optimal correction of fuel and air distribution, so that a more accurate coordination and combustion control effect cannot be obtained, and the key difficult problem to be solved urgently at present is formed.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a unit control system and a unit control method based on real-time on-line analysis of coal quality, which realize accurate fuel and air distribution of a thermal power unit through available on-line data of coal quality of fired coal meeting the real-time operation control requirement, and have obvious practical value.
The invention is realized by adopting the following technical scheme:
a unit control system based on real-time online analysis of coal quality comprises a coal feeder belt, a weighing instrument, a coal feeder variable speed motor, a coal feeder outlet pipeline, a coal mill inlet primary air pipeline, a primary air quantity measuring element, a boiler hearth, a coal quality online monitoring module, a coal feeder controller, an air feeder variable output element, an air feeding pipeline, a secondary air quantity measuring element and a secondary air controller; wherein,
a weighing instrument is arranged below the coal feeder belt, a coal feeder variable speed motor is connected with the coal feeder belt, a coal feeder outlet pipeline at the tail end of the coal feeder belt and a coal mill inlet primary air pipeline are communicated to a coal mill, a primary air quantity measuring element is arranged on the coal mill inlet primary air pipeline, a blower is communicated to a boiler hearth through an air supply pipeline, a secondary air quantity measuring element is arranged on the air supply pipeline, and a blower variable output element is connected to the blower;
the output end of the coal quality on-line monitoring module and the output end of a weighing instrument of a coal feeder belt are both connected to the input end of a coal feeding controller, the output end of the coal feeding controller is connected to the control end of a variable speed motor of the coal feeder, and the variable speed motor of the coal feeder is used for driving the belt of the coal feeder to transmit;
the output end of the coal quality on-line monitoring module is also connected to the input end of the secondary air controller together with the output ends of the primary air quantity measuring element and the secondary air quantity measuring element, the output end of the secondary air controller is connected to the control end of the variable output element of the air feeder, and the variable output element of the air feeder is used for changing the air output of the air feeder.
A unit set control method based on real-time online analysis of coal quality is based on the unit set control system based on real-time online analysis of coal quality, and comprises the following steps:
the coal feeder variable speed motor changes the rotating speed of the coal feeder variable speed motor according to the requirements of the unit set, drives a coal feeder belt to rotate, and sends the coal on the coal feeder belt to the coal mill, in the process, a weighing instrument on the coal feeder belt carries out real-time weighing, the actual coal feeding amount of the unit set is recorded, the coal quality on-line monitoring module outputs the coal feeding calorific value, the coal feeding calorific value is compared with the calorific value of standard coal, real-time and accurate coal feeding correction parameters are output, the coal feeding correction parameters and the actual coal feeding amount are sent to a coal feeding controller together for correcting the coal feeding amount, the coal feeding controller obtains a corrected coal feeder control instruction, the coal feeder variable speed motor is guided to operate, and the real-time control of the coal feeding according;
the variable output element of the air feeder changes the air output according to the demand of the unit set, and sends the air to the boiler hearth to provide proper combustion-supporting air for combustion, the primary air quantity measuring element on the primary air pipeline at the inlet of the coal mill monitors the primary air quantity entering the coal mill in real time, the coal quality on-line monitoring module outputs and inputs the calorific value of the coal in the boiler, and the primary air quantity and the secondary air quantity are used as known parameters to perform the following calculation:
comparing the calorific value of the coal as fired with the calorific value of the standard coal, and correcting the coal as fired amount to the standard coal amount; the air quantity required by unit standard coal combustion is calculated by dividing the total air quantity required by combustion by the corrected standard coal quantity, wherein the total air quantity required by combustion is obtained by subtracting the air quantity at the outlet of the economizer from the total air quantity of primary air and secondary air, and the air quantity at the outlet of the economizer is obtained by back-deducing the concentration of the oxygen quantity at the outlet; calculating to obtain the excess air quantity by using the rule that the oxygen content of the excess air before and after combustion is equal to the oxygen content of the smoke outlet device and listing an equation according to the target oxygen content concentration; forming secondary air quantity control feedforward according to the corrected coal quantity of the standard coal, the air quantity and the excess air quantity required by unit standard coal combustion, and the primary air quantity and the secondary air quantity measured by the air quantity measuring element; the calculated secondary air quantity control feedforward is sent to a secondary air controller, meanwhile, the secondary air controller receives the primary air quantity and the secondary air quantity sent by a primary air quantity measuring element and a secondary air quantity measuring element, the secondary air controller outputs a blower control instruction subjected to feedforward correction to guide a blower to operate according to variable output, and accurate control of air distribution according to the calorific value of coal as fired is achieved.
The invention has the further improvement that the heat value correction calculation method comprises the following steps: receiving the actual coal feeding calorific value sent by the coal quality on-line monitoring module, namely simply calculating the coal feeding calorific value at the outlet of the coal feeder and the standard coal calorific value to generate a calorific value correction coefficient C as follows:
and (3) sending the heat value correction coefficient C and the actual coal feeding amount obtained by weighing of a weighing instrument of a belt of the coal feeder into a coal feeding controller together to form an optimized coal feeder instruction, and controlling a variable speed motor of the coal feeder so as to finish the targeted correction of the coal feeding amount according to the real-time coal feeding calorific value.
The invention has the further improvement that the air volume correction calculation method comprises the following steps: receiving the calorific value of the coal as fired sent by the coal quality on-line monitoring module, comparing the calorific value with the calorific value of standard coal, and correcting the actual coal as the standard coal F, as follows:
calculating the air quantity K required by unit standard coal combustion as follows:
the excess air amount X is calculated as follows:
x × 21% (amount of coal calibrated by K × + X) × target oxygen amount
And introducing a preset value of target oxygen amount in the calculation process of the excess air amount X, and calculating to obtain the excess air amount X meeting the oxygen demand of the unit by taking the preset value as a guide.
The invention is further improved in that a secondary air volume control feedforward FF is calculated by the air volume K required by the combustion of unit standard coal, the excessive air volume X, the corrected standard coal volume and the measured primary air volume signal, and the method comprises the following steps:
FF (K × F + X) -primary air volume
And sending the secondary air volume control feedforward FF into a secondary air controller, adding the secondary air volume control feedforward FF to a total air volume set value, performing real-time and accurate air volume correction on the ongoing combustion process to obtain an optimized air supply instruction, and guiding a variable output element of the air feeder to perform output response according to the real-time requirement of the unit to form the optimal air-coal ratio.
The invention has at least the following beneficial technical effects:
1. the invention designs a calorific value correction calculation method based on the coal feeding calorific value, and provides better and accurate calorific value correction parameters when the coal feeding calorific value parameters provided by the coal quality online detection module are changed.
2. The traditional heat value correction mode is to generate a correction coefficient by using the deviation of standard coal feeding amount and real-time coal feeding amount obtained by converting unit power provided by coal feeding in a large delay process of combustion, and is to correct the finished process and delay based on the current time parameter. In the invention, the correction coefficient is obtained by comparing the real-time coal feeding calorific value with the standard coal calorific value, and is a parameter pair on-going process and real-time correction based on the current moment.
3. The invention designs an air quantity correction calculation method based on the heat productivity of the coal as fired, and provides more accurate air quantity correction parameters when the heat productivity parameters of the coal as fired provided by the coal quality on-line detection module are changed.
4. The traditional air volume correction mode is characterized in that the oxygen quantity of an economizer outlet after the combustion process is finished is made to approach the oxygen quantity of the economizer outlet through a PID algorithm on the basis of the oxygen quantity required by unit load conversion, so that a correction coefficient is formed, and the correction is obviously delayed. In the invention, according to the real-time heat productivity of the coal as fired, and in combination with the heat productivity of the standard coal, the actual coal feeding quantity, the total air quantity and the target oxygen quantity signal, the appropriate secondary air quantity control feedforward is calculated and obtained, and the air distribution condition in the combustion process is corrected in real time.
5. The real-time characteristics of heat value correction and air quantity correction in the invention ensure that the correction parameters of the heat value correction and the air quantity correction are matched with the combustion process which is in the process of generating, so that the deterioration effect on the process deviating from the optimal operation working condition of the system can not be generated, and the steady-state and dynamic characteristics of the main steam temperature and the main steam pressure and the environmental protection index of the denitration system can be effectively improved.
Drawings
FIG. 1 is a schematic diagram of a conventional heat value correction control;
FIG. 2 is a schematic view of a conventional oxygen correction control;
FIG. 3 is a block diagram of a unit set control system based on real-time on-line analysis of coal quality according to the present invention.
Description of reference numerals:
1. the system comprises a raw coal hopper, 2, a raw coal hopper outlet pipeline, 3, a coal feeder belt, 4, a weighing instrument, 5, a coal feeder variable speed motor, 6, a coal feeder outlet pipeline, 7, a coal mill, 8, a coal mill inlet primary air pipeline, 9, a primary air quantity measuring element, 10, a boiler hearth, 11, a coal quality online monitoring module, 12, a coal feeder controller, 13, a blower, 14, a blower variable output element, 15, an air feeding pipeline, 16, a secondary air quantity measuring element, 17 and a secondary air controller.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 3, the unit set control system based on real-time online analysis of coal quality provided by the invention comprises a raw coal hopper 1, a raw coal hopper outlet pipeline 2, a coal feeder belt 3, a weighing instrument 4, a coal feeder variable speed motor 5, a coal feeder outlet pipeline 6, a coal mill 7, a coal mill inlet primary air pipeline 8, a primary air volume measuring element 9, a boiler furnace 10, an online coal quality monitoring module 11, a coal feeder controller 12, a blower 13, a blower variable output element 14, an air supply pipeline 15, a secondary air volume measuring element 16 and a secondary air controller 17.
The coal in the raw coal hopper 1 falls on a coal feeder belt 3 through a raw coal hopper outlet pipeline 2, a coal feeder variable speed motor 5 changes the motor rotating speed according to the requirement of a unit set to drive the coal feeder belt 3, the coal on the coal feeder belt 3 is sent to a coal mill 7, in the process, a weighing instrument 4 on the coal feeder belt 3 carries out real-time weighing, the actual coal feeding quantity of the unit set is recorded, a coal quality online monitoring module 11 outputs the coal feeding calorific value, compares the coal feeding calorific value with the calorific value of standard coal, outputs real-time and accurate coal feeding correction parameters, and sends the coal feeding correction parameters and the actual coal feeding quantity to a coal feeding controller 12 to carry out correction of a coal feeding quantity instruction, and the coal feeding controller 12 obtains a corrected coal feeding machine control instruction to guide the operation of the coal feeder variable speed motor 5 to realize real-time control of the coal feeding according to the coal feeding calorific;
the variable output element 14 of the blower changes the air output according to the demand of the unit set, and sends the air to the boiler furnace 10 to provide proper combustion-supporting air for combustion, the primary air quantity measuring element 9 on the primary air pipeline 8 at the inlet of the coal mill monitors the primary air quantity entering the coal mill 7 in real time, the coal quality on-line monitoring module 11 outputs the calorific value of the coal as fired, the calorific value of the coal as fired and the primary air quantity and the secondary air quantity are used as input together, the secondary air quantity control feedforward is obtained through calculation, the secondary air controller 17 outputs the blower control instruction corrected by the feedforward, the blower 13 is guided to operate according to the variable output, and the accurate control of air distribution according to.
The invention provides a unit set control method based on real-time on-line analysis of coal quality, which comprises the following steps:
the coal quality on-line monitoring module 11 outputs the coal feeding calorific value, compares the coal feeding calorific value with the calorific value of the standard coal, outputs real-time and accurate coal feeding correction parameters, sends the parameters and the actual coal feeding amount to the coal feeding controller 12 to correct the coal feeding amount, and the coal feeding controller 12 obtains a corrected coal feeding machine control instruction to guide the operation of the coal feeding machine variable speed motor 5. The specific calculation process is as follows:
the actual coal feeding calorific value sent by the coal quality online monitoring module 11, namely the coal feeding machine outlet coal calorific value is compared with the standard coal calorific value to generate a calorific value correction coefficient C as follows:
and (3) sending the calorific value correction coefficient C and the actual coal feeding amount obtained by weighing by the weighing instrument 4 of the coal feeder belt 3 into the coal feeding controller 12 together to form an optimized coal feeder instruction, and controlling the variable speed motor 5 of the coal feeder so as to finish the targeted correction of the coal feeding amount according to the real-time coal feeding calorific value. Compared with the traditional heat value correction, the method corrects the coal feeding amount deviation from the self heating characteristic of the fire coal, and the correction result is more accurate.
The coal quality on-line monitoring module 11 outputs the heating value of the coal as fired, the heating value and the primary air quantity and the secondary air quantity are used as input, secondary air quantity control feedforward is obtained through calculation, and the secondary air controller 17 outputs a blower control instruction corrected through feedforward so as to guide the blower to operate according to the variable output. The specific calculation process is as follows:
the calorific value of the coal as fired sent from the coal quality on-line monitoring module 11 is compared with the calorific value of the standard coal, and the actual coal as fired amount is corrected to the standard coal amount F as follows:
calculating the air quantity K required by unit standard coal combustion as follows:
the excess air amount X is calculated as follows:
x × 21% (amount of coal calibrated by K × + X) × target oxygen amount
And introducing a preset value of target oxygen amount in the calculation process of the excess air amount X, and calculating to obtain the excess air amount X meeting the oxygen demand of the unit by taking the preset value as a guide. Compared with the traditional method that only the actual oxygen amount is introduced for air volume correction, the method has stronger instantaneity and higher accuracy.
Calculating a secondary air volume control feedforward FF according to the air volume K required by unit standard coal combustion, the excessive air volume X, the corrected standard coal volume and the measured primary air volume signal, wherein the secondary air volume control feedforward FF is as follows:
FF (K × F + X) -primary air volume
And a secondary air volume control feedforward FF is sent into a secondary air controller 17 and added with a total air volume set value, real-time and accurate air volume correction is carried out on the ongoing combustion process, an optimized air supply instruction is obtained, an air feeder variable output element 14 is guided to carry out output response according to the actual requirement of the unit, the optimal air-coal ratio is formed, and the combustion efficiency is obviously improved.
Claims (6)
1. A unit control system based on real-time on-line analysis of coal quality is characterized by comprising a coal feeder belt (3), a weighing instrument (4), a coal feeder variable speed motor (5), a coal feeder outlet pipeline (6), a coal mill (7), a coal mill inlet primary air pipeline (8), a primary air quantity measuring element (9), a boiler furnace (10), a coal quality on-line monitoring module (11), a coal feeder controller (12), a blower (13), a blower variable output element (14), an air supply pipeline (15), a secondary air quantity measuring element (16) and a secondary air controller (17); wherein,
a weighing instrument (4) is installed below a coal feeder belt (3), a coal feeder variable speed motor (5) is connected with the coal feeder belt (3), a coal feeder outlet pipeline (6) at the tail end of the coal feeder belt (3) and a coal mill inlet primary air pipeline (8) are communicated to a coal mill (7), a primary air quantity measuring element (9) is arranged on the coal mill inlet primary air pipeline (8), a blower (13) is communicated to a boiler furnace (10) through an air supply pipeline (15), a secondary air quantity measuring element (16) is arranged on the air supply pipeline (15), and a blower variable output element (14) is connected to the blower (13);
the output end of the coal quality online monitoring module (11) and the output end of a weighing instrument (4) of the coal feeder belt (3) are both connected to the input end of a coal feeder controller (12), the output end of the coal feeder controller (12) is connected to the control end of a coal feeder variable speed motor (5), and the coal feeder variable speed motor (5) is used for driving the coal feeder belt (3) to transmit;
the output end of the coal quality online monitoring module (11) is also connected to the input end of a secondary air controller (17) together with the output ends of the primary air quantity measuring element (9) and the secondary air quantity measuring element (16), the output end of the secondary air controller (17) is connected to the control end of an air feeder variable output element (14), and the air feeder variable output element (14) is used for changing the air supply quantity of an air feeder (13).
2. The unit set control system based on real-time on-line coal quality analysis is characterized by comprising a reduction coal hopper (1), wherein the raw coal hopper (1) is communicated to a coal feeder belt (3) through a raw coal hopper outlet pipeline (2).
3. A unit set control method based on real-time on-line analysis of coal quality, which is based on the unit set control system based on real-time on-line analysis of coal quality as claimed in claim 1 or 2, and comprises:
the coal feeder variable speed motor (5) changes the rotating speed of the coal feeder variable speed motor (5) according to the requirements of the unit set, drives a coal feeder belt (3) to rotate, and sends the coal on the coal feeder belt (3) to a coal mill (7), in the process, a weighing instrument (4) on the coal feeder belt (3) carries out real-time weighing, the actual coal feeding quantity of the unit set is recorded, a coal quality online monitoring module (11) outputs the coal feeding calorific value, the coal feeding calorific value is compared with the calorific value of standard coal to obtain real-time and accurate coal feeding correction parameters, the coal feeding quantity and the actual coal feeding quantity are sent to a coal feeding controller (12) together to carry out coal feeding quantity correction, the corrected coal feeding controller (12) outputs a coal feeding machine control instruction to guide the operation of the coal feeder variable speed motor (5), and the real-time control of the coal feeding according to the coal;
the variable output element of the blower (13) changes the air output according to the demand of the unit set, and sends the air output to the boiler furnace (10) to provide proper combustion-supporting air quantity for combustion, the primary air quantity measuring element (9) on the primary air pipeline (8) at the inlet of the coal mill monitors the primary air quantity entering the coal mill (7) in real time, the coal quality on-line monitoring module (11) outputs and inputs the calorific value of the coal in the furnace, and the calorific value, the primary air quantity and the secondary air quantity are taken as known parameters together to perform the following calculation:
comparing the calorific value of the coal as fired with the calorific value of the standard coal, and correcting the coal as fired amount to the standard coal amount; the air quantity required by unit standard coal combustion is calculated by dividing the total air quantity required by combustion by the corrected standard coal quantity, wherein the total air quantity required by combustion is obtained by subtracting the air quantity at the outlet of the economizer from the total air quantity of primary air and secondary air, and the air quantity at the outlet of the economizer is obtained by back-deducing the concentration of the oxygen quantity at the outlet; calculating to obtain the excess air quantity by using the rule that the oxygen content of the excess air before and after combustion is equal to the oxygen content of the smoke outlet device and listing an equation according to the target oxygen content concentration; and (3) calculating to obtain secondary air volume control feedforward according to the corrected standard coal quantity, the air volume and the excess air volume required by unit standard coal combustion, and the primary air volume and the secondary air volume measured by the air volume measuring element, sending the secondary air volume control feedforward to a secondary air controller (17), meanwhile, receiving the primary air volume and the secondary air volume sent by the primary air volume measuring element (9) and the secondary air volume measuring element (16) by the secondary air controller (17), outputting a blower control instruction subjected to feedforward correction by the secondary air controller (17), guiding a blower (13) to operate with variable output, and realizing accurate control of air distribution according to the calorific value of the coal as fired.
4. The unit set control method based on real-time on-line coal quality analysis according to claim 3, wherein the heat value correction calculation method comprises the following steps:
the actual coal feeding calorific value sent by the coal quality online monitoring module (11), namely the coal feeding machine outlet coal-fired calorific value is compared with the standard coal calorific value to generate a calorific value correction coefficient C as follows:
and (3) sending the heat value correction coefficient C and the actual coal feeding amount obtained by weighing the weighing instrument (4) of the coal feeding machine belt (3) into a coal feeding controller (12) together to form an optimized coal feeding machine instruction, and controlling a variable speed motor (5) of the coal feeding machine, so that the targeted correction of the coal feeding amount is completed according to the real-time coal feeding calorific value.
5. The unit set control method based on real-time on-line coal quality analysis according to claim 3, wherein the air volume correction calculation method comprises the following steps:
the calorific value of the coal as fired sent by the coal quality on-line monitoring module (11) is compared with the calorific value of standard coal, and the actual coal as fired amount is corrected to be the standard coal amount F as follows:
calculating the air quantity K required by unit standard coal combustion as follows:
the excess air amount X is calculated as follows:
x × 21% (amount of coal calibrated by K × + X) × target oxygen amount
And introducing a preset value of target oxygen amount in the calculation process of the excess air amount X, and calculating to obtain the excess air amount X meeting the oxygen demand of the unit by taking the preset value as a guide.
6. The unit set control method based on real-time on-line coal quality analysis according to claim 5, wherein a secondary air volume control feedforward FF is calculated from an air volume K required by unit standard coal combustion, an excess air volume X, a corrected standard coal volume and a measured primary air volume signal, and is as follows:
FF (K × F + X) -primary air volume
And a secondary air volume control feedforward FF is sent to a secondary air controller (17) and is added with a total air volume set value, real-time and accurate air volume correction is carried out on the ongoing combustion process, an optimized air supply instruction is obtained, and an air feeder variable output element (14) is guided to carry out output response according to the real-time requirement of a unit, so that the optimal air-coal ratio is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010312610.0A CN111396919A (en) | 2020-04-20 | 2020-04-20 | Unit unit control system and method based on real-time online analysis of coal quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010312610.0A CN111396919A (en) | 2020-04-20 | 2020-04-20 | Unit unit control system and method based on real-time online analysis of coal quality |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111396919A true CN111396919A (en) | 2020-07-10 |
Family
ID=71435355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010312610.0A Pending CN111396919A (en) | 2020-04-20 | 2020-04-20 | Unit unit control system and method based on real-time online analysis of coal quality |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111396919A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462597A (en) * | 2020-11-26 | 2021-03-09 | 淮浙煤电有限责任公司凤台发电分公司 | Coal quantity logic calculation method for coal feeder by adopting SAMA (sampling and analysis) diagram |
| CN112781032A (en) * | 2021-02-05 | 2021-05-11 | 神华神东电力有限责任公司 | Control method and control device for secondary air of circulating fluidized bed boiler |
| CN113283091A (en) * | 2021-05-31 | 2021-08-20 | 苏州西热节能环保技术有限公司 | Real-time combustion-supporting dry air amount and wet flue gas amount calculating method |
| CN113359428A (en) * | 2021-05-24 | 2021-09-07 | 大唐东北电力试验研究院有限公司 | Supercritical unit fuel calorific value correction control method based on dynamic work coal ratio |
| CN113515040A (en) * | 2021-04-24 | 2021-10-19 | 西安热工研究院有限公司 | Thermal power generation unit set self-adaptive coal type change coordination control system and method |
| CN114704828A (en) * | 2022-05-09 | 2022-07-05 | 北京和隆优化科技股份有限公司 | CFB boiler load control method and system for mixed combustion of coal slime |
-
2020
- 2020-04-20 CN CN202010312610.0A patent/CN111396919A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462597A (en) * | 2020-11-26 | 2021-03-09 | 淮浙煤电有限责任公司凤台发电分公司 | Coal quantity logic calculation method for coal feeder by adopting SAMA (sampling and analysis) diagram |
| CN112781032A (en) * | 2021-02-05 | 2021-05-11 | 神华神东电力有限责任公司 | Control method and control device for secondary air of circulating fluidized bed boiler |
| CN113515040A (en) * | 2021-04-24 | 2021-10-19 | 西安热工研究院有限公司 | Thermal power generation unit set self-adaptive coal type change coordination control system and method |
| CN113515040B (en) * | 2021-04-24 | 2022-06-17 | 西安热工研究院有限公司 | Thermal power generation unit set self-adaptive coal type change coordination control system and method |
| CN113359428A (en) * | 2021-05-24 | 2021-09-07 | 大唐东北电力试验研究院有限公司 | Supercritical unit fuel calorific value correction control method based on dynamic work coal ratio |
| CN113359428B (en) * | 2021-05-24 | 2022-07-26 | 大唐东北电力试验研究院有限公司 | Supercritical unit fuel calorific value correction control method based on dynamic work coal ratio |
| CN113283091A (en) * | 2021-05-31 | 2021-08-20 | 苏州西热节能环保技术有限公司 | Real-time combustion-supporting dry air amount and wet flue gas amount calculating method |
| CN113283091B (en) * | 2021-05-31 | 2023-11-17 | 苏州西热节能环保技术有限公司 | Real-time calculation method for combustion-supporting dry air quantity and wet smoke quantity |
| CN114704828A (en) * | 2022-05-09 | 2022-07-05 | 北京和隆优化科技股份有限公司 | CFB boiler load control method and system for mixed combustion of coal slime |
| CN114704828B (en) * | 2022-05-09 | 2023-09-19 | 北京和隆优化科技股份有限公司 | CFB boiler load control method and system for blending coal slime |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111396919A (en) | Unit unit control system and method based on real-time online analysis of coal quality | |
| CN110848733B (en) | Combustion optimization method based on coal quality on-line monitoring | |
| US6622645B2 (en) | Combustion optimization with inferential sensor | |
| CN109307437B (en) | Optimized combustion control system and method for heat accumulating type industrial heating furnace | |
| CN109882833B (en) | Steam temperature control method for load-variable process of secondary reheating thermal power generating unit | |
| CN112650169B (en) | Generator set main parameter control system based on enthalpy value and fuel online heat value calculation | |
| CN101892338A (en) | Constant wind temperature control system for hot blast stove | |
| CN112664975B (en) | Air volume control method suitable for pulverized coal fired boiler | |
| CN108679592B (en) | A kind of the boiler load control system and control method of biomass boiler | |
| CN107368049A (en) | The control method of coal-supplying amount under unit varying duty based on Power Plant DCS System | |
| CN102853419A (en) | Intelligent optimization control system of pulverized coal furnace | |
| WO2022252414A1 (en) | Coal-air synchronous dynamic coordinated control method for coal-fired unit | |
| CN113390099B (en) | Coordination control method under coal-fired cogeneration unit self-adaptive BTU | |
| CN112784474A (en) | Boiler coal-fired relative heat value calculation method based on unit coal powder oxygen consumption | |
| CN112178683A (en) | Optimal control method for water-coal ratio of coal-fired unit under condition of coal quality change | |
| US4054408A (en) | Method for optimizing the position of a furnace damper without flue gas analyzers | |
| CN106705034B (en) | A kind of supercritical circulating fluidized bed boiler unit quick load change control method | |
| CN112781032A (en) | Control method and control device for secondary air of circulating fluidized bed boiler | |
| CN212132513U (en) | Unit unit control system based on real-time online analysis of coal quality | |
| CN113485499B (en) | Coal feeding regulation and control method for coal quality working condition change | |
| CN112363554B (en) | Thermal power generating unit air volume and air pressure decoupling control method | |
| CN115981154A (en) | Low-carbon optimization test method suitable for power plant unit coordination control system | |
| CN109579044B (en) | Air-fuel ratio dynamic feedforward combustion control method for walking beam furnace | |
| CN107831656A (en) | A kind of fired power generating unit coordinated control system energy saving optimizing technology | |
| CN108361731B (en) | Hot-water boiler air and flue system automation control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |