CN103216826B - 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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CN103216826B
CN103216826B CN201310111800.6A CN201310111800A CN103216826B CN 103216826 B CN103216826 B CN 103216826B CN 201310111800 A CN201310111800 A CN 201310111800A CN 103216826 B CN103216826 B CN 103216826B
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input
output
steam pressure
main steam
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CN103216826A (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 predicting method 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 method 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 method of CFBB generating set, is applied to and carries out self_adaptive adjusting to the boiler combustion of CFBB generating set.
Background technology
Along with the raising of expanding economy and people's level of consumption, the proportion of household electricity is gradually in increasing, and wherein have more than 75% in generating equipment installed capacity for thermal power generation, coal is more and more higher as the consumption of primary energy.CFBB is more and more subject to people's attention as a kind of thermal power generation boiler of cleaning, and the use of Circulating Fluidized Bed Boilers also gets more and more.But the combustion system of CFBB is the nonlinear system of a large time delay, close coupling, interact between each variable serious, especially CFBB stress reaction is delayed larger, makes the stability contorting 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 method of CFBB generating set, the stability contorting solving the main vapour pressure of CFBB generating set is difficult to the technical problem realized.
A main vapour pressure auto-adaptive estimate method for CFBB generating set, comprises addition module, subtraction block, multiplier module, dividing module, function module, one order inertia module and time delay module, the input s of subtraction block M4 1with the main vapour pressure of CFBB generating set pt connects, the input s of the first function module M1 1with the steam turbine pitch μ of CFBB generating set tconnect, the output of the first function module M1 respectively with the input s of subtraction block M4 2with the input s of addition module M12 2connect, the output of subtraction block M4 and the input s of dividing module M5 1connect, the input s of the first multiplier module M3 1with the boiler coal feeding amount of CFBB generating set bt connects, the output of ratio module M2 and the input s of the first multiplier module M3 2connect, the output of the first multiplier module M3 and the input s of the second one order inertia module M7 1connect, the input s of the second one order inertia module M7 2be connected with switching signal, the output of the second one order inertia module M7 and the input s of 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 1with the input s of the second multiplier module M11 2connect, the input s of time delay module M9 2be connected with switching signal, the output of time delay module M9 and the input s of the 4th one order inertia module M10 1connect, the input s of the 4th one order inertia module M10 2be connected with switching signal, the output of the 4th one order inertia module M10 and the input s of dividing module M5 2connect, the output of dividing module M5 is connected with the input of the first one order inertia module M6, the output of the first one order inertia module M6 and the input s of the second multiplier module M11 1connect, the output of the second multiplier module M11 and the input s of addition module M12 1connect, the output of addition module M12 p 1with boiler master pressure set points model calling.
Described boiler master pressure set points module is connected with the boiler master PID controller module of CFBB generating set.
The present invention constructs a gain-adaptive prediction device, as the model of simulation loop fluidized-bed combustion boiler combustion characteristics, utilize the total coal-supplying amount of boiler, actual main vapour pressure and steam turbine pitch aperture as prediction device three input variables, the output of this prediction device is unit and estimates main vapour pressure, and this estimates main vapour pressure and main vapour pressure setting value asks deviation as the input deviation of boiler master PID in cooperation control.This estimates pressure and equals actual main vapour pressure in the steady state, estimate the value that the total coal-supplying amount of pressure superposition and steam turbine pitch aperture affect main vapour pressure in a dynamic state, when varying duty due to the change 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, thus realize the steady control of main vapour pressure.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Detailed description of the invention
A main vapour pressure auto-adaptive estimate method for CFBB generating set, comprises addition module, subtraction block, multiplier module, dividing module, function module, one order inertia module and time delay module, the input s of subtraction block M4 1with the main vapour pressure of CFBB generating set pt connects, the input s of the first function module M1 1with the steam turbine pitch μ of CFBB generating set tconnect, the output of the first function module M1 respectively with the input s of subtraction block M4 2with the input s of addition module M12 2connect, the output of subtraction block M4 and the input s of dividing module M5 1connect, the input s of the first multiplier module M3 1with the boiler coal feeding amount of CFBB generating set bt connects, the output of ratio module M2 and the input s of the first multiplier module M3 2connect, the output of the first multiplier module M3 and the input s of the second one order inertia module M7 1connect, the input s of the second one order inertia module M7 2be connected with switching signal, the output of the second one order inertia module M7 and the input s of 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 1with the input s of the second multiplier module M11 2connect, the input s of time delay module M9 2be connected with switching signal, the output of time delay module M9 and the input s of the 4th one order inertia module M10 1connect, the input s of the 4th one order inertia module M10 2be connected with switching signal, the output of the 4th one order inertia module M10 and the input s of dividing module M5 2connect, the output of dividing module M5 is connected with the input of the first one order inertia module M6, the output of the first one order inertia module M6 and the input s of the second multiplier module M11 1connect, the output of the second multiplier module M11 and the input s of addition module M12 1connect, the output of addition module M12 p 1with boiler master pressure set points model calling.
Described boiler master pressure set points module is connected with the boiler master PID controller module of CFBB generating set.
Specific embodiment of the invention process is as follows:
The first step, to test through the actual pressure dynamic response characteristic of 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 form approximate two rank inertial elements series connection, come approximate representation according to pressure response characteristic test obtain from boiler coal feeding amount bt changes to the deferring procedure generated required for corresponding quantity of steam; Adopt time delay module M9 and the 4th one order inertia module M10 approximate representation from generating steam to the time delay caused required for boiler heat storage energy variation;
Second step, according to the parameter under unit different load, according to steam turbine pitch μ tchange the scope on the impact of main vapour pressure and size, and export as steam turbine pitch μ using the first function module M1 tconnect change to the influence value estimating pressure;
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 dividing module M5 output valve divided by the output valve of the 4th one order inertia module M10, then through the first one order inertia module M6, obtains main vapour pressure regulation coefficient;
4th step, the first one order inertia module M6 output valve are multiplied 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, now obtains boiler prediction device and exports and be and estimate pressure p 1;
5th step, p 1deviation is asked to send into boiler master PID arithmetic with boiler master pressure set points.

Claims (2)

1. the main vapour pressure auto-adaptive estimate method of a CFBB generating set, comprise addition module, subtraction block, multiplier module, dividing module, function module, one order inertia module and time delay module, it is characterized in that, the input s of subtraction block (M4) 1with the main vapour pressure of CFBB generating set pt connects, the input s of the first function module (M1) 1with the steam turbine pitch μ of CFBB generating set tconnect, the output of the first function module (M1) respectively with the input s of subtraction block (M4) 2with the input s of addition module (M12) 2connect, the output of subtraction block (M4) and the input s of dividing module (M5) 1connect, the input s of the first multiplier module (M3) 1with the boiler coal feeding amount of CFBB generating set bt connects, the output of ratio module (M2) and the input s of the first multiplier module (M3) 2connect, the output of the first multiplier module (M3) and the input s of the second one order inertia module (M7) 1connect, the input s of the second one order inertia module (M7) 2be connected with switching signal, the output of the second one order inertia module (M7) and the input s of 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) 1with the input s of the second multiplier module (M11) 2connect, the input s of time delay module (M9) 2be connected with switching signal, the output of time delay module (M9) and the input s of the 4th one order inertia module (M10) 1connect, the input s of the 4th one order inertia module (M10) 2be connected with switching signal, the output of the 4th one order inertia module (M10) and the input s of dividing module (M5) 2connect, the output of dividing module (M5) is connected with the input of the first one order inertia module (M6), the output of the first one order inertia module (M6) and the input s of the second multiplier module (M11) 1connect, the output of the second multiplier module (M11) and the input s of addition module (M12) 1connect, the output of addition module (M12) p 1with boiler master pressure set points model calling.
2. the main vapour pressure auto-adaptive estimate method of a kind of CFBB generating set according to claim 1, it is characterized in that, described boiler master pressure set points module is connected with the boiler master PID controller module of CFBB generating set.
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CN103411213B (en) * 2013-08-05 2015-09-30 浙江大学 Fan for Circulating Fluidized Bed Boiler power consumption prognoses system and method
CN103616913B (en) * 2013-08-05 2015-04-29 浙江大学 Circulating fluidized bed boiler induced-draft fan current prediction system and method
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
CN106123005B (en) * 2016-06-23 2017-12-22 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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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

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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

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