CN104132367A - Method for controlling amount of coal conveyed into furnace of thermal generator set on basis of virtual fuel quantity - Google Patents
Method for controlling amount of coal conveyed into furnace of thermal generator set on basis of virtual fuel quantity Download PDFInfo
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- CN104132367A CN104132367A CN201410369765.2A CN201410369765A CN104132367A CN 104132367 A CN104132367 A CN 104132367A CN 201410369765 A CN201410369765 A CN 201410369765A CN 104132367 A CN104132367 A CN 104132367A
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Abstract
The invention discloses a method for controlling the amount of coal conveyed into a furnace of a thermal generator set on the basis of virtual fuel quantity. The method includes the steps that (1) a fuel quantity instruction signal is formed through a unit load instruction and a boiler main steam pressure deviation signal, (2) virtual fuel quantity represented by capacity air door openness and coal mill inlet primary air pressure is obtained through coal mill capacity air door openness and a coal mill inlet primary air pressure signal, (3) by means of a PID arithmetic device, deviation signals of a fuel quantity instruction and a virtual fuel quantity are dynamically modified, the capacity air door openness is adjusted, and the quantity of fuel entering a hearth is adjusted. The virtual quantity of the fuel entering the hearth is obtained by means of the coal mill capacity air door openness and the coal mill inlet primary air pressure through functional operation and multiplication, the problems that a coordination system of a double-inlet double-outlet powder grinding system thermal generator set is poor in capacity air amount measurement reliability, and accordingly fluctuation of set operation parameters is large and even the coordination system can not be put into operation are solved, and stability and safety of operation of the set are improved.
Description
Technical field
The invention belongs to Control Engineering technical field.Relate to a kind of thermal power generation unit furnace coal weight control method based on virtual fuel amount.
Background technology
Along with the raising of boiler of power plant unit parameter and capacity, thermal technology's automatic control level is also proposed to requirements at the higher level.The task of thermal power plant pulverized coal preparation system is exactly some, quality to be provided and to meet the coal dust of burden requirement for boiler.Double inlet and outlet coal mill pulverized coal preparation system is used widely because of advantages such as coal is adaptable, boiler load fast response times.Go with each other all the time in powder-grinding system, raw coal is delivered to coal pulverizer through feeder, is become coal dust by the steel ball impacting in coal pulverizer.The coal dust that fineness is qualified is carried and enters hearth combustion by capacity wind.The underproof coal dust of fineness continues to grind in coal pulverizer.Some coal dust of coal pulverizer cylindrical shell internal memory, the coal amount that therefore enters burner hearth can not directly be reflected by the coal-supplying amount of feeder, but indirectly characterize by coal pulverizer capacity air quantity.But be subject to installation, the calibration mass of on-the-spot capacity wind measurement mechanism, and the impact such as equipment operating environment is severe, measured hole obstruction, level gauging, exist capacity wind to measure poor reliability, calculate the problems such as furnace coal weight and actual furnace coal weight deviation are large, easily cause boiler/turbine coordination control system regulation quality poor, the main operational factor fluctuation of unit is large, and boiler combustion is unstable, affects stability and the security of unit operation.
Summary of the invention
The technical problem to be solved in the present invention is, for the defect of prior art, to provide a kind of thermal power generation unit furnace coal weight control method based on virtual fuel amount.In powder-grinding system thermal power generation unit boiler/turbine coordination control system, use the method going with each other all the time, can solve because coal pulverizer capacity air measuring poor reliability, calculating furnace coal weight and actual furnace coal weight deviation cause greatly unit operation parameter fluctuation large, the problem that even coherent system cannot put into operation, can improve coordinated control system regulation quality, improve stability and the security of unit operation.
Technical scheme of the present invention is that a kind of thermal power generation unit furnace coal weight control method based on virtual fuel amount, comprises the steps:
Step 1: by the analog input channel of DCS, get unit load command signal, by the computing of fuel quantity instruction feedforward function, form fuel quantity instruction feed-forward signal; Get the measuring-signal of main steam pressure, and carry out subtraction with main steam pressure setting value, obtain main steam pressure deviation signal, then main steam pressure deviation signal is carried out to the computing of pressure divergence feedforward function, mineralization pressure deviation feed-forward signal; Main steam pressure deviation signal is carried out to PID computing, form the dynamic corrected signal of fuel quantity instruction; Utilize conventional add operation, dynamic to fuel quantity instruction feed-forward signal, pressure divergence feed-forward signal and fuel quantity instruction corrected signal is added, form fuel quantity command signal;
Step 2: by the analog input channel of DCS, get coal pulverizer capacity throttle opening, carry out computing by the corresponding virtual fuel flow function of throttle opening, obtain the fuel quantity that capacity throttle opening characterizes; Get coal pulverizer inlet primary air pressure force signal by the analog input channel of DCS equally, the virtual fuel quantity correction coefficient function corresponding by coal pulverizer inlet primary air pressure carries out computing, obtains fuel quantity correction factor; Utilize conventional multiplying, the fuel quantity that capacity throttle opening is characterized is multiplied by the correction factor that coal pulverizer inlet primary air pressure forms, and obtains the virtual fuel amount that enters boiler furnace;
Step 3: utilize conventional subtraction, fuel quantity instruction and the actual virtual fuel amount that enters burner hearth are subtracted each other, obtain fuel quantity deviation signal; Fuel quantity deviation signal is carried out to PID computing, form fuel quantity drift correction signal;
Step 4: utilize conventional add operation, by fuel quantity drift correction signal, add the offset signal that operations staff arranges according to unit operation situation, as the instruction of capacity throttle opening, adjust capacity throttle opening, regulate the fuel quantity that enters burner hearth.
Technological core of the present invention is: utilize coal pulverizer capacity throttle opening and coal pulverizer inlet primary air pressure to carry out function f (x) computing and multiplying, formation enters the virtual fuel amount of burner hearth, overcome because capacity air measuring poor reliability, calculating furnace coal weight and actual furnace coal weight deviation are large, cause boiler/turbine coordination control system regulation quality poor, unit operation parameter fluctuation is large, the problem that even coherent system cannot put into operation, the stability and the security that have improved unit operation.
The invention has the beneficial effects as follows:
1), solved due to capacity air measuring poor reliability, calculate furnace coal weight and actual furnace coal weight deviation large, cause boiler/turbine coordination control system regulation quality poor, unit operation parameter fluctuation is large, the problem that even coherent system cannot put into operation, improve coordinated control system regulation quality, improved stability and the security of unit operation.
2), by DCS (English full name is the abbreviation of Distributed Control System, and Chinese translation is scattered control system) engineering software calculate, do not need increase investment.
3), be applicable to various thermal power generation unit DCS control systems, configuration convenience.
Brief description of the drawings
Fig. 1 is that virtual fuel amount of the present invention is calculated SAMA figure.
Detailed description of the invention
(1), fuel quantity command calculations.1. by the analog input channel of DCS, get unit load command signal, unit load instruction is through the computing of fuel quantity instruction feedforward function, obtain the feed-forward signal of unit load to fuel quantity, fuel quantity instruction feedforward function corresponding relation is as shown in table 1, and concrete functional form is to measure according to data unit operation.2. get the measuring-signal of main steam pressure, utilize conventional subtraction, main steam pressure and its setting value are subtracted each other, obtain main steam pressure deviation signal; Then, utilize main steam pressure deviation signal to carry out the computing of pressure divergence feedforward function, mineralization pressure deviation feed-forward signal, pressure divergence feedforward function corresponding relation is as shown in table 2, and concrete functional form is to measure according to data unit operation.3. pressure divergence signal is carried out to PID (ratio, integration, differential) computing, form the dynamic corrected signal of fuel quantity instruction.Utilize conventional add operation, by above-mentioned three additions, form fuel quantity command signal.
The feedforward function of table 1 unit load instruction to fuel
| Load instruction (MW) | 0 | 150 | 330 | 400 | 500 | 660 |
| Fuel command feedforward (t) | 0 | 73 | 160 | 194 | 242 | 320 |
The feedforward function of table 2 pressure divergence to fuel
| Pressure divergence (MPa) | -2 | -1 | -0.3 | 0.3 | 1 | 2 |
| Fuel command feedforward (t) | -20 | -8 | 0 | 0 | 8 | 20 |
(2), virtual fuel amount is calculated.By the analog input channel of DCS, get coal pulverizer capacity throttle opening, coal pulverizer capacity throttle opening, through the computing of virtual fuel flow function, obtains the virtual fuel amount that it characterizes, virtual fuel flow function corresponding relation is as shown in table 3, and concrete functional form is to measure according to data unit operation.Get coal pulverizer inlet primary air pressure force signal by the analog input channel of DCS equally, by virtual fuel quantity correction coefficient functional operation corresponding to coal pulverizer inlet primary air pressure, obtain fuel quantity correction factor, function corresponding relation is as shown in table 4, and concrete functional form is to measure according to data unit operation.Utilize conventional multiplying, the fuel quantity that capacity throttle opening is characterized is multiplied by the correction factor that coal pulverizer inlet primary air pressure forms, and obtains the virtual fuel amount that enters boiler furnace.
The virtual fuel amount that table 3 capacity throttle opening is corresponding
| Throttle opening (%) | 0 | 15 | 40 | 55 | 100 | 105 |
| Virtual fuel amount (t) | 0 | 5 | 30 | 37.5 | 45 | 45 |
The virtual fuel quantity correction coefficient that table 4 coal pulverizer inlet primary air pressure is corresponding
| Primary air pressure (kPa) | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 15 |
| Fuel quantity correction factor (%) | 0 | 0.447 | 0.632 | 0.775 | 0.894 | 1.0 | 1.095 | 1.225 |
(3), fuel quantity drift correction.Utilize conventional subtraction, fuel quantity instruction and the actual virtual fuel amount that enters burner hearth are subtracted each other, obtain fuel quantity deviation signal.Fuel quantity deviation signal is carried out to PID computing, form fuel quantity drift correction signal, the parameter of PID controller is measured by fuel upset test.
(4), fuel quantity regulates.Utilize conventional add operation, by fuel quantity drift correction signal, add the offset signal that operations staff arranges according to unit operation situation, as the instruction of capacity throttle opening, adjust capacity throttle opening, regulate the fuel quantity that enters boiler furnace.
Claims (1)
1. the thermal power generation unit furnace coal weight control method based on virtual fuel amount, is characterized in that, comprises the steps:
Step 1: by the analog input channel of DCS, get unit load command signal, by the computing of fuel quantity instruction feedforward function, form fuel quantity instruction feed-forward signal; Get the measuring-signal of main steam pressure, and carry out subtraction with main steam pressure setting value, obtain main steam pressure deviation signal, then main steam pressure deviation signal is carried out to the computing of pressure divergence feedforward function, mineralization pressure deviation feed-forward signal; Main steam pressure deviation signal is carried out to PID computing, form the dynamic corrected signal of fuel quantity instruction; Utilize conventional add operation, dynamic to fuel quantity instruction feed-forward signal, pressure divergence feed-forward signal and fuel quantity instruction corrected signal is added, form fuel quantity command signal;
Step 2: by the analog input channel of DCS, get coal pulverizer capacity throttle opening, carry out computing by the corresponding virtual fuel flow function of throttle opening, obtain the fuel quantity that capacity throttle opening characterizes; Get coal pulverizer inlet primary air pressure force signal by the analog input channel of DCS equally, the virtual fuel quantity correction coefficient function corresponding by coal pulverizer inlet primary air pressure carries out computing, obtains fuel quantity correction factor; Utilize conventional multiplying, the fuel quantity that capacity throttle opening is characterized is multiplied by the correction factor that coal pulverizer inlet primary air pressure forms, and obtains the virtual fuel amount that enters boiler furnace;
Step 3: utilize conventional subtraction, fuel quantity instruction and the actual virtual fuel amount that enters burner hearth are subtracted each other, obtain fuel quantity deviation signal; Fuel quantity deviation signal is carried out to PID computing, form fuel quantity drift correction signal;
Step 4: utilize conventional add operation, by fuel quantity drift correction signal, add the offset signal that operations staff arranges according to unit operation situation, as the instruction of capacity throttle opening, adjust capacity throttle opening, regulate the fuel quantity that enters burner hearth.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104932566A (en) * | 2015-06-05 | 2015-09-23 | 国网山东省电力公司电力科学研究院 | Control system and method for improving the rapid boiler adjusting capability of unit generating set |
| CN105182925A (en) * | 2015-08-12 | 2015-12-23 | 国家电网公司 | Energy-saving coordination control method for coal-fired power units |
| CN105402713A (en) * | 2015-12-29 | 2016-03-16 | 神华集团有限责任公司 | Control method, equipment and system for boiler-turbine coordinated system |
| CN110832251A (en) * | 2017-06-09 | 2020-02-21 | 出光兴产株式会社 | Fuel reduction rate output system, fuel reduction rate output method, and fuel reduction rate output program |
| CN110989708A (en) * | 2019-10-30 | 2020-04-10 | 华电电力科学研究院有限公司 | Pressure feedforward control method based on decision function |
| CN111351020A (en) * | 2020-03-12 | 2020-06-30 | 华电漯河发电有限公司 | Control method for accelerating response speed of coal-fired boiler of thermal power plant |
| CN111649313A (en) * | 2020-06-16 | 2020-09-11 | 上海明华电力科技有限公司 | Control method for inhibiting heat transfer deterioration of water-cooled wall of vertical tube coil of supercritical boiler |
| 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 |
| CN114178036A (en) * | 2021-10-15 | 2022-03-15 | 广东红海湾发电有限公司 | Inlet primary air volume and primary air pressure control method of coal mill |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104932566B (en) * | 2015-06-05 | 2017-09-29 | 国网山东省电力公司电力科学研究院 | A kind of control system and method for improving the quick adjustment capability of elementary generator group boiler |
| CN104932566A (en) * | 2015-06-05 | 2015-09-23 | 国网山东省电力公司电力科学研究院 | Control system and method for improving the rapid boiler adjusting capability of unit generating set |
| CN105182925A (en) * | 2015-08-12 | 2015-12-23 | 国家电网公司 | Energy-saving coordination control method for coal-fired power units |
| CN105182925B (en) * | 2015-08-12 | 2016-08-17 | 国家电网公司 | A kind of energy-saving control method for coordinating of thermal power generation unit |
| CN105402713A (en) * | 2015-12-29 | 2016-03-16 | 神华集团有限责任公司 | Control method, equipment and system for boiler-turbine coordinated system |
| CN110832251B (en) * | 2017-06-09 | 2021-08-31 | 出光兴产株式会社 | Fuel reduction rate output system, fuel reduction rate output method, and storage medium |
| CN110832251A (en) * | 2017-06-09 | 2020-02-21 | 出光兴产株式会社 | Fuel reduction rate output system, fuel reduction rate output method, and fuel reduction rate output program |
| CN110989708A (en) * | 2019-10-30 | 2020-04-10 | 华电电力科学研究院有限公司 | Pressure feedforward control method based on decision function |
| CN110989708B (en) * | 2019-10-30 | 2023-02-28 | 华电电力科学研究院有限公司 | Pressure feedforward control method based on decision function |
| CN111351020B (en) * | 2020-03-12 | 2021-08-31 | 华电漯河发电有限公司 | Control method for accelerating response speed of coal-fired boiler of thermal power plant |
| CN111351020A (en) * | 2020-03-12 | 2020-06-30 | 华电漯河发电有限公司 | Control method for accelerating response speed of coal-fired boiler of thermal power plant |
| CN111649313A (en) * | 2020-06-16 | 2020-09-11 | 上海明华电力科技有限公司 | Control method for inhibiting heat transfer deterioration of water-cooled wall of vertical tube coil of supercritical boiler |
| 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 |
| CN114178036A (en) * | 2021-10-15 | 2022-03-15 | 广东红海湾发电有限公司 | Inlet primary air volume and primary air pressure control method of coal mill |
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