CN103216826A - Main steam pressure self-adaptive predictor of generator set of circulating fluidized bed boiler - Google Patents

Main steam pressure self-adaptive predictor of generator set of circulating fluidized bed boiler Download PDF

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Publication number
CN103216826A
CN103216826A CN2013101118006A CN201310111800A CN103216826A CN 103216826 A CN103216826 A CN 103216826A CN 2013101118006 A CN2013101118006 A CN 2013101118006A CN 201310111800 A CN201310111800 A CN 201310111800A CN 103216826 A CN103216826 A CN 103216826A
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module
input
output
steam pressure
main steam
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CN103216826B (en
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贾峰生
张缠保
于秀兰
段秋刚
倪子俊
杜艳生
周策
戴光
温武
张志刚
郝丽华
武瀚
赵易彦
白东海
杨琦
张颖
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
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Abstract

The invention discloses a main steam pressure self-adaptive predictor of a generator set of a circulating fluidized bed boiler, which solves the problem that the stable control of the main steam pressure of the generator set of the circulating fluidized bed boiler is difficult to realize. A gain self-adaptive Smith predictor is constructed according to the Smith prediction principle, by utilizing the total coal supply quantity, the actual main steam pressure, and the opening of a control valve of a steam engine of the boiler as three input variables of the Smith predictor, the output of the predictor serves as predicted main steam pressure of the generator set, and a deviation between a predicted main steam pressure value and a main steam pressure set value is calculated and used as an input deviation of a master control PID of the boiler in coordination control. In a steady state, the predicted main steam pressure is equal to the actual main steam pressure, in a dynamic state, the predicted main steam pressure integrates a value of the influence of the total coal supply quantity of the generator set and the opening of the control valve of the steam engine on the main steam pressure, and under variable loads, due to the changes of the total coal supply quantity and the opening of the control valve of the steam engine, the input deviation of the master control PID of the boiler is timely eliminated, so that the master control of the boiler rapidly enters a new stable state.

Description

The main vapour pressure auto-adaptive estimate device of CFBB generating set
Technical field
The present invention relates to a kind of automaton, particularly a kind of main vapour pressure auto-adaptive estimate device of CFBB generating set is applied to that self adaptation is carried out in the boiler combustion of CFBB generating set and regulates control.
Background technology
Along with the raising of expanding economy and people's level of consumption, the proportion of household electricity is strengthening gradually, wherein has in the generating equipment installed capacity to be thermal power generation more than 75%, and coal is more and more higher as the consumption of primary energy.CFBB more and more is subject to people's attention as a kind of thermal power generation boiler of cleaning, and the use of Circulating Fluidized Bed Boilers is also more and more.But the combustion system of CFBB is the nonlinear system of a large time delay, close coupling, and it is serious to interact between each variable, and especially the hysteresis of CFBB stress reaction is bigger, makes the stable control of unit main vapour pressure be difficult to realize.
Summary of the invention
The invention provides a kind of main vapour pressure auto-adaptive estimate device of CFBB generating set, solved the technical problem that the stable control of the main vapour pressure of CFBB generating set is difficult to realize.
A kind of main vapour pressure auto-adaptive estimate device of CFBB generating set comprises addition module, subtraction block, multiplier module, division module, function module, one order inertia module and time delay module, the input s of subtraction block M4 1Main vapour pressure with the CFBB generating set PT connects, the input s of the first function module M1 1Steam turbine pitch μ with the CFBB generating set tConnect, the output of the first function module M1 respectively with the input s of subtraction block M4 2Input s with addition module M12 2Connect the input s of the output of subtraction block M4 and division module M5 1Connect the input s of the first multiplier module M3 1Guo Lu Give coal amount with the CFBB generating set BT connects, the input s of the output of ratio module M2 and the first multiplier module M3 2Connect the input s of the output of the first multiplier module M3 and the second one order inertia module M7 1Connect the input s of the second one order inertia module M7 2Be connected the input s of the output of the second one order inertia module M7 and the 3rd one order inertia module M8 with switching signal 1Connect the input s of the 3rd one order inertia module M8 2Be connected with switching signal, the output of the 3rd one order inertia module M8 respectively with the input s of time delay module M9 1Input s with the second multiplier module M11 2Connect the input s of time delay module M9 2Be connected the input s of the output of time delay module M9 and the 4th one order inertia module M10 with switching signal 1Connect the input s of the 4th one order inertia module M10 2Be connected the input s of the output of the 4th one order inertia module M10 and division module M5 with switching signal 2Connect, the output of division module M5 is connected with the input of the first one order inertia module M6, the input s of the output of the first one order inertia module M6 and the second multiplier module M11 1Connect the input s of the output of the second multiplier module M11 and addition module M12 1Connect the output of addition module M12 P 1Be connected with boiler master pressure set points module.
Be connected with the boiler master PID controller module of CFBB generating set on the described boiler master pressure set points module.
The present invention constructs a gain-adaptive prediction device, model as simulation loop fluidized-bed combustion boiler combustion characteristics, utilize boiler Zong Give coal amount, actual main vapour pressure and steam turbine pitch aperture as three input variables of prediction device, this prediction device output is unit and estimates main vapour pressure, and this estimates main vapour pressure and the main vapour pressure setting value asks deviation as the input deviation of coordinating boiler master PID in the control.This estimates pressure and equals actual main vapour pressure under stable state, dynamically estimating pressure superposition Zong Give coal amount and steam turbine pitch aperture value down to the main vapour pressure influence, when varying duty because the variation of total coal-supplying amount and steam turbine pitch aperture, the input deviation of boiler master PID is changed timely, make boiler master enter new stable state very soon, thereby realize the steady control of main vapour pressure.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
The specific embodiment
A kind of main vapour pressure auto-adaptive estimate device of CFBB generating set comprises addition module, subtraction block, multiplier module, division module, function module, one order inertia module and time delay module, the input s of subtraction block M4 1Main vapour pressure with the CFBB generating set PT connects, the input s of the first function module M1 1Steam turbine pitch μ with the CFBB generating set tConnect, the output of the first function module M1 respectively with the input s of subtraction block M4 2Input s with addition module M12 2Connect the input s of the output of subtraction block M4 and division module M5 1Connect the input s of the first multiplier module M3 1Guo Lu Give coal amount with the CFBB generating set BT connects, the input s of the output of ratio module M2 and the first multiplier module M3 2Connect the input s of the output of the first multiplier module M3 and the second one order inertia module M7 1Connect the input s of the second one order inertia module M7 2 withSwitching signal connects, the input s of the output of the second one order inertia module M7 and the 3rd one order inertia module M8 1Connect the input s of the 3rd one order inertia module M8 2Be connected with switching signal, the output of the 3rd one order inertia module M8 respectively with the input s of time delay module M9 1Input s with the second multiplier module M11 2Connect the input s of time delay module M9 2Be connected the input s of the output of time delay module M9 and the 4th one order inertia module M10 with switching signal 1Connect the input s of the 4th one order inertia module M10 2Be connected the input s of the output of the 4th one order inertia module M10 and division module M5 with switching signal 2Connect, the output of division module M5 is connected with the input of the first one order inertia module M6, the input s of the output of the first one order inertia module M6 and the second multiplier module M11 1Connect the input s of the output of the second multiplier module M11 and addition module M12 1Connect the output of addition module M12 P 1Be connected with boiler master pressure set points module.
Be connected with the boiler master PID controller module of CFBB generating set on the described boiler master pressure set points module.
Specific implementation process of the present invention is as follows:
The actual pressure dynamic response characteristic test of the first step, process unit, adopt a ratio module M2, the first multiplier module M3, the second one order inertia module M7 and the 3rd one order inertia module M8 to constitute approximate two rank inertial elements series connection, come approximate representation test obtain according to pressure response characteristic from pot stove Give coal amount BT changes to and generates the needed deferring procedure of corresponding quantity of steam; Adopt time delay module M9 and the 4th one order inertia module M10 approximate representation from generating steam to causing boiler heat storage energy variation needed time delay;
Second the step, according to the parameter under the unit different load, according to steam turbine pitch μ tVariation is to the scope and the size of the influence of main vapour pressure, and with first function module M1 output as steam turbine pitch μ tVariation is to estimating the influence value of pressure;
The 3rd step, main vapour pressure PThe output valve that t deducts the first function module M1 obtains the output valve of subtraction block M4, and then obtains division module M5 output valve divided by the output valve of the 4th one order inertia module M10, again through the first one order inertia module M6, obtains main vapour pressure and adjusts coefficient;
The 4th step, the first one order inertia module M6 output valve multiply by the output valve that the 3rd one order inertia module M8 output valve obtains the second multiplier module M11, the output valve of adding the first function module M1 obtains addition module M12 output valve, obtains boiler prediction device output this moment and is and estimates pressure P 1;
The 5th step, P 1Ask deviation to send into boiler master PID computing with the boiler master pressure set points.

Claims (2)

1. the main vapour pressure auto-adaptive estimate device of a CFBB generating set, comprise addition module, subtraction block, multiplier module, division module, function module, one order inertia module and time delay module, it is characterized in that the input s of subtraction block (M4) 1Main vapour pressure with the CFBB generating set PT connects, the input s of first function module (M1) 1Steam turbine pitch μ with the CFBB generating set tConnect, the output of first function module (M1) respectively with the input s of subtraction block (M4) 2And the input s of addition module (M12) 2Connect the input s of the output of subtraction block (M4) and division module (M5) 1Connect the input s of first multiplier module (M3) 1Guo Lu Give coal amount with the CFBB generating set BT connects, the input s of the output of ratio module (M2) and first multiplier module (M3) 2Connect the input s of the output of first multiplier module (M3) and the second one order inertia module (M7) 1Connect the input s of the second one order inertia module (M7) 2Be connected the input s of the output of the second one order inertia module (M7) and the 3rd one order inertia module (M8) with switching signal 1Connect the input s of the 3rd one order inertia module (M8) 2Be connected with switching signal, the output of the 3rd one order inertia module (M8) respectively with the input s of time delay module (M9) 1Input s with second multiplier module (M11) 2Connect the input s of time delay module (M9) 2Be connected the input s of the output of time delay module (M9) and the 4th one order inertia module (M10) with switching signal 1Connect the input s of the 4th one order inertia module (M10) 2Be connected the input s of the output of the 4th one order inertia module (M10) and division module (M5) with switching signal 2Connect, the output of division module (M5) is connected with the input of the first one order inertia module (M6), the input s of the output of the first one order inertia module (M6) and second multiplier module (M11) 1Connect the input s of the output of second multiplier module (M11) and addition module (M12) 1Connect the output of addition module (M12) P 1Be connected with boiler master pressure set points module.
2. the main vapour pressure auto-adaptive estimate device of a kind of CFBB generating set according to claim 1, it is characterized in that, be connected with the boiler master PID controller module of CFBB generating set on the described boiler master pressure set points module.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103411213A (en) * 2013-08-05 2013-11-27 浙江大学 Power consumption prediction system and method for fans of circulating fluidized bed boiler
CN103574598A (en) * 2013-11-09 2014-02-12 国家电网公司 Coordinative feed-forward control system of circulating fluidized bed unit
CN103616913A (en) * 2013-08-05 2014-03-05 浙江大学 Circulating fluidized bed boiler induced-draft fan current prediction system and method
CN106123005A (en) * 2016-06-23 2016-11-16 国网新疆电力公司电力科学研究院 The coal-supplying amount pre-control method of coal unit boiler feed-forward

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07210208A (en) * 1994-01-12 1995-08-11 Hitachi Ltd Autotuning method for thermal power plant and thermal power plant controller utilizing the same
JP2001041403A (en) * 1999-07-30 2001-02-13 Babcock Hitachi Kk Boiler controller
US20040081549A1 (en) * 2002-10-28 2004-04-29 Vadim Shapiro Method and apparatus for improving steam turbine control
CN102588011A (en) * 2012-03-06 2012-07-18 山西省电力公司电力科学研究院 Steam engine main control system of large fossil power unit
CN102607053A (en) * 2012-02-29 2012-07-25 东南大学 Intermittent control method for eliminating static deviation of main steam pressure of fossil fuel fired power unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07210208A (en) * 1994-01-12 1995-08-11 Hitachi Ltd Autotuning method for thermal power plant and thermal power plant controller utilizing the same
JP2001041403A (en) * 1999-07-30 2001-02-13 Babcock Hitachi Kk Boiler controller
US20040081549A1 (en) * 2002-10-28 2004-04-29 Vadim Shapiro Method and apparatus for improving steam turbine control
CN102607053A (en) * 2012-02-29 2012-07-25 东南大学 Intermittent control method for eliminating static deviation of main steam pressure of fossil fuel fired power unit
CN102588011A (en) * 2012-03-06 2012-07-18 山西省电力公司电力科学研究院 Steam engine main control system of large fossil power unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103411213A (en) * 2013-08-05 2013-11-27 浙江大学 Power consumption prediction system and method for fans of circulating fluidized bed boiler
CN103616913A (en) * 2013-08-05 2014-03-05 浙江大学 Circulating fluidized bed boiler induced-draft fan current prediction system and method
CN103574598A (en) * 2013-11-09 2014-02-12 国家电网公司 Coordinative feed-forward control system of circulating fluidized bed unit
CN103574598B (en) * 2013-11-09 2015-11-04 国家电网公司 A kind of circulating fluidized bed unit cooperative feedforward control system
CN106123005A (en) * 2016-06-23 2016-11-16 国网新疆电力公司电力科学研究院 The coal-supplying amount pre-control method of coal unit boiler feed-forward

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