CN102588939B - Main boiler control system for large thermal power generating unit - Google Patents
Main boiler control system for large thermal power generating unit Download PDFInfo
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- 239000003245 coal Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 9
- 239000000446 fuel Substances 0.000 claims description 8
- 238000010304 firing Methods 0.000 claims description 4
- 230000004069 differentiation Effects 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000007664 blowing Methods 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 238000010298 pulverizing process Methods 0.000 abstract 1
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Abstract
The invention discloses a main boiler control system for a large thermal power generating unit, which belongs to automatic circuit control systems for power station boilers, and achieves rapid load response and stable control of a main boiler control system for a large thermal power generating unit. The main boiler control system comprises a PID (proportion integration differentiation) module, the boiler, a steam turbine, a generator, an A/D (analog-to-digital) converter, steam turbine speed regulating pressure, drum pressure, main steam pressure and a generator power sensor; and a function module, a simulation manipulator, a division module, a multiplication module, an addition module, a constant value module, a switching module, a regulating module, an 'AND' gate module and a 'NOT' gate module in a distributed control system are used for constructing a real-time online optimizing circuit, so that the independent main boiler control system is formed. Thermal efficiency indexes and technical parameter indexes of the unit can be improved, and energy conservation and emission reduction are achieved. The main boiler control system is suitable for the large unit of a peak shaving and direct blowing double-inlet and double-outlet coal mill coal pulverizing system.
Description
Technical field
The present invention relates to a kind of automatic control system, particularly a kind of PID automatic control system of large-sized station boiler.
Background technology
Fast development along with national economy, high parameter, large capacity unit shared ratio in electrical network is more and more large, because power structure changes, and the peak of electrical network daily load curve and the increase of the difference of low ebb, some regional peak-valley difference reaches more than 50%, and also has the trend that continues increase.Therefore, require at present monoblock all to there is the ability that participates in peak load regulation network, frequency modulation, thereby boiler main is controlled system has just become the complete important part of automatic control task of coordinating of large electric power plant unit.Increase along with the large-scale thermal power machine pool-size, the variation of boiler load, confluent, main steam temperature, burning and main vapour pressure etc. and the impact of other disturbing factor, the operations staff adopts manual adjustments to be difficult to meet Production requirement, even do not reach the requirement of controlling index, thereby directly affect safety and the economical operation of unit.
Summary of the invention
The boiler main control For Solutions of Systems of a kind of large electric power plant unit provided by the invention has been determined prior art can not be to the system quick load response processed of large-scale unit boiler master and the stable technical problem of controlling.
The present invention overcomes the above problems by following scheme:
A kind of boiler main of large electric power plant unit is controlled system, comprise PID module adjuster, boiler, steam turbine, generator, A/D converter, simulating manipulator, main vapour pressure sensor and generator power sensor, total fuel quantity instruction of described boiler place unit is connected with the tracking input of simulating manipulator, the boiler load instruction of described boiler place unit is connected with the tracking input of the 2nd PID module adjuster with the tracking input of a PID module adjuster respectively, the boiler master of described boiler place unit is cut manual command and is connected with the MI input of simulating manipulator, all fuel of described boiler place unit are controlled manual command and are connected with the TS input of simulating manipulator, the output of the steam turbine speed control stage pressure sensor of described unit is connected with the input of described the first A/D converter, the output of the main vapour pressure sensor of described unit is connected with the input of described the second A/D converter, the output of the drum pressure sensor of described unit is connected with the input of described the 3rd A/D converter, the output of the generator power sensor of described unit is connected with the input of described the 4th A/D converter, the output of described the first A/D converter is connected with an input of division module, the output of described the second A/D converter is connected with another input of division module, the output of described division module is connected with an input of the first multiplier module, the output of described the first multiplier module is connected with an input of the first addition module, the output of described the first multiplier module is connected with the input of the first function module, the output of described the first multiplier module is connected with an input of the 3rd addition module, the output of described the first multiplier module is connected with an input of the second multiplier module, the output of described the first function module is connected with another input of the 3rd addition module, the output of described the second multiplier module is connected with another input of the first addition module, the output of described the 3rd addition module is connected with another input of the second multiplier module, the output of described the first addition module is connected with an input of the second addition module, the output of described the second addition module is connected with the SP input of a PID module adjuster, the output O1 of described the first A/D converter is connected with another input U21 of the 6th addition module B6, the output of main vapour pressure setting value P0 is connected with another input of the first multiplier module, described main vapour pressure setting value is connected with an input of the 4th addition module, the main vapour pressure setting value is connected with the input of the second function module, the output of described the second function module is connected with another input of the 4th addition module, the output of described the 4th addition module is connected with another input of the second addition module, the output of described the 3rd A/D converter is connected with an input of slender acanthopanax method module, the output of described slender acanthopanax method module is connected with an input of the 6th addition module, the output of described the 6th addition module is connected with the PV input of simulating manipulator, the output of the 6th addition module is connected with the PV input of a PID module adjuster, the output of described the 3rd A/D converter is connected with the input of the 3rd function module, the output of described the 3rd function module is connected with another input of slender acanthopanax method module, the output of described the 4th A/D converter is connected with the PV input of the 2nd PID module adjuster, main vapour pressure setting value P0 is connected with an input of the 7th addition module, main vapour pressure setting value P0 is connected with the SP input of the 2nd PID module adjuster, main vapour pressure setting value P0 is connected with the input of the 4th function module, the output of described the 4th function module is connected with another input of the 7th addition module, the output of described the 7th addition module is connected with the second input of the second handover module, the output of definite value module is connected with the first input end of the second handover module, described CCS2 mode instruction V6 is connected with the 3rd input of the second handover module, the output of described the second handover module is connected with the FF input of the 2nd PID module adjuster, the output X19 of described the 2nd PID module adjuster is connected with the second input of the first handover module, the output of described the first handover module is connected with the A input of simulating manipulator, the output of a described PID module adjuster is connected with the first input end of the first handover module, described CCS2 mode instruction V6 is connected with the 3rd input of the first handover module, described CCS2 mode instruction V6 is connected with an input of door module with second, the output of described boiler master automatic command V5 is connected with an input of door module with first, described boiler master automatic command is connected with another input of door module with second, the input of described CCS2 mode instruction V6 NAND gate module is connected, the output of described not gate module is connected with another input of door module with first, described first is connected with the TF input of a PID module adjuster with the output of door module, the output of described the second addition module is connected with the SP input of analog regulator, described second is connected with the TF input of the 2nd PID module adjuster with the output of door module, the O output of described analog regulator is connected with the boiler load instruction, the A output of described analog regulator is connected with the boiler master automatic command.
Described boiler is the large-scale pulverized coal firing boiler of direct-firing double inlet and outlet coal mill.
The invention solves to large-scale Coordinated Control Systems dynamically with combining and the stable technical problem of controlling, can improve thermal efficiency indices and the performance indications of unit and reach the purpose of energy-saving and emission-reduction.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Dotted line in figure is switching value, and solid line is analog quantity.
Specific embodiment
A kind of boiler main of large electric power plant unit is controlled system, comprise PID module adjuster, boiler, steam turbine, generator, A/D converter, simulating manipulator CZ, main vapour pressure sensor and generator power sensor, total fuel quantity instruction V1 of described boiler place unit is connected with the tracking input TR of simulating manipulator CZ, the boiler load instruction V2 of described boiler place unit is connected with the tracking input TR of the 2nd PID module adjuster PID-2 with the tracking input TR of a PID module adjuster PID-1 respectively, the boiler master of described boiler place unit is cut manual command V3 and is connected with the MI input of simulating manipulator CZ, all fuel of described boiler place unit are controlled manual command V4 and are connected with the TS input of simulating manipulator CZ, the output P1 of the steam turbine speed control stage pressure sensor of described unit is connected with the input of described the first A/D converter M1, the output PT of the main vapour pressure sensor of described unit is connected with the input of described the second A/D converter M2, the output Pb of the drum pressure sensor of described unit is connected with the input of described the 3rd A/D converter M3, the output PE of the generator power sensor of described unit is connected with the input of described the 4th A/D converter M4, the output O1 of described the first A/D converter M1 is connected with the input U1 of division module E, the output O2 of described the second A/D converter M2 is connected with another input U2 of division module E, the output X1 of described division module E is connected with the input U3 of the first multiplier module A1, the output X2 of described the first multiplier module A1 is connected with the input U10 of the first addition module B1, the output X2 of described the first multiplier module A1 is connected with the input U5 of the first function module D1, the output X2 of described the first multiplier module A1 is connected with the input U6 of the 3rd addition module B3, the output X2 of described the first multiplier module A1 is connected with the input U8 of the second multiplier module A2, the output X9 of described the first function module D1 is connected with another input U7 of the 3rd addition module B3, the output X11 of described the second multiplier module A2 is connected with another input U11 of the first addition module B1, the output X10 of described the 3rd addition module B3 is connected with another input U9 of the second multiplier module A2, the output X3 of described the first addition module B1 is connected with the input U12 of the second addition module B2, the output X4 of described the second addition module B2 is connected with the SP input of a PID module adjuster, the output O1 of described the first A/D converter M1 is connected with another input U21 of the 6th addition module B6, the output of main vapour pressure setting value P0 is connected with another input of the first multiplier module A1, described main vapour pressure setting value P0 is connected with the input U15 of the 4th addition module B4, main vapour pressure setting value P0 is connected with the input U14 of the second function module D2, the output X6 of described the second function module D2 is connected with another input U16 of the 4th addition module B4, the output X7 of described the 4th addition module B4 is connected with another input U13 of the second addition module B2, the output O3 of described the 3rd A/D converter M3 is connected with the input U18 of slender acanthopanax method module B5, the output X8 of described slender acanthopanax method module B5 is connected with the input (U20) of the 6th addition module B6, the output X12 of described the 6th addition module B6 is connected with the PV input of simulating manipulator CZ, the output X12 of the 6th addition module B6 is connected with the PV input of a PID module adjuster PID-1, the output O3 of described the 3rd A/D converter M3 is connected with the input U17 of the 3rd function module D3, the output X13 of described the 3rd function module D3 is connected with another input U19 of slender acanthopanax method module B5, the output O4 of described the 4th A/D converter M4 is connected with the PV input of the 2nd PID module adjuster PID-2, main vapour pressure setting value P0 is connected with the input U23 of the 7th addition module B7, main vapour pressure setting value P0 is connected with the SP input of the 2nd PID module adjuster PID-2, main vapour pressure setting value P0 is connected with the input U22 of the 4th function module D4, the output X14 of described the 4th function module D4 is connected with another input U24 of the 7th addition module B7, the output X16 of described the 7th addition module B7 is connected with the second input U32 of the second handover module T2, the output X24 of definite value module H is connected with the first input end U31 of the second handover module T2, described CCS2 mode instruction V6 is connected with the 3rd input U33 of the second handover module T2, the output X17 of described the second handover module T2 is connected with the FF input of the 2nd PID module adjuster PID-2, the output X19 of described the 2nd PID module adjuster PID-2 is connected with the second input U29 of the first handover module T1, the output X22 of described the first handover module T1 is connected with the A input of simulating manipulator CZ, the output X5 of a described PID module adjuster PID-1 is connected with the first input end U28 of the first handover module T1, described CCS2 mode instruction V6 is connected with the 3rd input U30 of the first handover module T1, described CCS2 mode instruction V6 is connected with the input U34 of door module F2 with second, the output of described boiler master automatic command V5 is connected with the input U26 of door module F1 with first, described boiler master automatic command V5 is connected with another input U35 of door module F2 with second, the input U25 of described CCS2 mode instruction V6 NAND gate module N is connected, the output X15 of described not gate module N is connected with another input U27 of door module F1 with first, described first is connected with the TF input of a PID module adjuster PID-1 with the output X20 of door module F1, the output X4 of described the second addition module B2 is connected with the SP input of analog regulator CZ, described second is connected with the TF input of the 2nd PID module adjuster PID-2 with the output X18 of door module F2, the O output of described analog regulator CZ is connected with boiler load instruction X21, the A output of described analog regulator CZ is connected with boiler master automatic command X23.
A kind of boiler main of large electric power plant unit is controlled system, comprise PID module, boiler, steam turbine, generator, A/D converter, steam turbine speed control stage pressure, drum pressure, main vapour pressure and generator power sensor, adopt function module, simulating manipulator, division module, multiplier module, addition module, definite value module, handover module, adjustment module, AND gate module, inverter module in scattered control system to be built into the real-time online optimized circuit, form independently quick load response and a stable automatic control system of controlling.
A kind of boiler main of large electric power plant unit is controlled system, controls step as follows: at first with steam turbine speed control stage pressure P1, divided by main vapour pressure PT, obtain the X1 value.The X1 value is multiplied by main vapour pressure setting value P0 and obtains energy balance value X2 value.The output X11 value that energy balance value X2 value is added to multiplier module A2 obtains the X3 value.The X3 value is added to the output X7 value of addition module B4 obtains X4 value (function module D2 and addition module B4 form differentiation element).Heat signal value X12 sends into the measurement input PV of adjustment module PID-1, the output valve X4 of addition module sends into the given input SP of adjustment module PID-1, boiler load instruction V2 sends into the tracking input TR of adjustment module PID-1, and the output X20 of AND gate module F1 sends into the switching input TF of adjustment module PID-1.Energy balance value X2 value obtains the X9 value after changing by function module D1, and X9 adds energy balance value X2 value and obtains the X10 value, and the X10 value is added energy balance value X2 value and obtained the X11 value.Main vapour pressure setting value P0 obtains the X6 value after changing by function module D2, and the negative value of X6 value is added main vapour pressure setting value P0 and obtained the X7 value.Drum pressure Pb value is obtained to the X13 value after function module D3 conversion, drum pressure Pb value adds that the output negative value of function module D3 obtains X8 value (function module D3 and addition module B5 form differentiation element), and the X8 value is added steam turbine speed control stage pressure P1 value and obtained heat signal X12 value.Main vapour pressure setting value P0 obtains the X14 value after changing by function module D4, the negative value of X14 value is added main vapour pressure setting value P0 and is obtained X16 value (function module D4 and addition module B7 form differentiation element), the output X24 of X16 value and definite value module H is as two inputs of handover module T2, and the control mode of handover module T2 selects U32 to be controlled by CCS2 mode instruction (switching value).Generator power PE value is sent into the measurement input PV of adjustment module PID-2, main vapour pressure setting value P0 sends into the given input SP of adjustment module PID-2, boiler load instruction V2 sends into the tracking input TR of adjustment module PID-2, the output X18 of AND gate module F2 sends into the switching input TF of adjustment module PID-2, and the output X17 of handover module T2 sends into the feedforward input FF of adjustment module PID-2.The output X19 of adjustment module PID-2 sends into the input U29 of handover module T1, and the output X5 of adjustment module PID-1 sends into the input U28 of handover module T1, and the control mode of handover module T1 selects U30 to be controlled by CCS2 mode instruction (switching value).Boiler master automatic command V5 sends into the input U26 of AND gate module F1, and CCS2 mode instruction (switching value) V6 sends into the input U27 of AND gate module F1 after the output of inverter module.All fuel is controlled to the input TS end that manual command V4 sends into simulating manipulator CZ.Boiler master is cut to the input MI end that manual command V3 sends into simulating manipulator CZ.Heat signal X12 is sent into to the measurement input PV end of simulating manipulator CZ.The output X4 of addition module B2 is sent into to the given input SP end of simulating manipulator CZ.The output of handover module T1 is sent into to the input A end of simulating manipulator CZ.Total fuel value is sent into to the tracking input TR end of simulating manipulator CZ.The output O of simulating manipulator CZ as boiler load instruction send into next system.The output A of simulating manipulator CZ sends into next system as the boiler master automatic command.
Claims (2)
1. the boiler main of a large electric power plant unit is controlled system, comprise PID module adjuster, boiler, steam turbine, generator, A/D converter, simulating manipulator (CZ), main vapour pressure sensor and generator power sensor, it is characterized in that, total fuel quantity instruction (V1) of described boiler place unit is connected with the tracking input (TR) of simulating manipulator (CZ), the boiler load instruction (V2) of described boiler place unit is connected with the tracking input (TR) of the 2nd PID module adjuster (PID-2) with the tracking input (TR) of a PID module adjuster (PID-1) respectively, the boiler master of described boiler place unit is cut manual command (V3) and is connected with the MI input of simulating manipulator (CZ), all fuel of described boiler place unit are controlled manual command (V4) and are connected with the TS input of simulating manipulator (CZ), the output (P1) of the steam turbine speed control stage pressure sensor of described unit is connected with the input of the first A/D converter (M1), the output (PT) of the main vapour pressure sensor of described unit is connected with the input of the second A/D converter (M2), the output (Pb) of the drum pressure sensor of described unit is connected with the input of the 3rd A/D converter (M3), the output (PE) of the generator power sensor of described unit is connected with the input of the 4th A/D converter (M4), the output (O1) of described the first A/D converter (M1) is connected with an input (U1) of division module (E), the output (O2) of described the second A/D converter (M2) is connected with another input (U2) of division module (E), the output (X1) of described division module (E) is connected with an input (U3) of the first multiplier module (A1), the output (X2) of described the first multiplier module (A1) is connected with an input (U10) of the first addition module (B1), the output (X2) of described the first multiplier module (A1) is connected with the input (U5) of the first function module (D1), the output (X2) of described the first multiplier module (A1) is connected with an input (U6) of the 3rd addition module (B3), the output (X2) of described the first multiplier module (A1) is connected with an input (U8) of the second multiplier module (A2), the output (X9) of described the first function module (D1) is connected with another input (U7) of the 3rd addition module (B3), the output (X11) of described the second multiplier module (A2) is connected with another input (U11) of the first addition module (B1), the output (X10) of described the 3rd addition module (B3) is connected with another input (U9) of the second multiplier module (A2), the output (X3) of described the first addition module (B1) is connected with an input (U12) of the second addition module (B2), the output (X4) of described the second addition module (B2) is connected with the SP input of a PID module adjuster (PID-1)The output (O1) of described the first A/D converter (M1) is connected with another input (U21) of the 6th addition module (B6), the output of main vapour pressure setting value (P0) is connected with another input (U4) of the first multiplier module (A1), described main vapour pressure setting value (P0) is connected with an input (U15) of the 4th addition module (B4), main vapour pressure setting value (P0) is connected with the input (U14) of the second function module (D2), the output (X6) of described the second function module (D2) is connected with another input (U16) of the 4th addition module (B4), the output (X7) of described the 4th addition module (B4) is connected with another input (U13) of the second addition module (B2), the output (O3) of described the 3rd A/D converter (M3) is connected with an input (U18) of slender acanthopanax method module (B5), the output (X8) of described slender acanthopanax method module (B5) is connected with an input (U20) of the 6th addition module (B6), the output (X12) of described the 6th addition module (B6) is connected with the PV input of simulating manipulator (CZ), the output (X12) of the 6th addition module (B6) is connected with the PV input of a PID module adjuster (PID-1), the output (O3) of described the 3rd A/D converter (M3) is connected with the input (U17) of the 3rd function module (D3), the output (X13) of described the 3rd function module (D3) is connected with another input (U19) of slender acanthopanax method module (B5), the output (O4) of described the 4th A/D converter (M4) is connected with the PV input of the 2nd PID module adjuster (PID-2), main vapour pressure setting value (P0) is connected with an input (U23) of the 7th addition module (B7), main vapour pressure setting value (P0) is connected with the SP input of the 2nd PID module adjuster (PID-2), main vapour pressure setting value (P0) is connected with the input (U22) of the 4th function module (D4), the output (X14) of described the 4th function module (D4) is connected with another input (U24) of the 7th addition module (B7), the output (X16) of described the 7th addition module (B7) is connected with second input (U32) of the second handover module (T2), the output (X24) of definite value module (H) is connected with the first input end (U31) of the second handover module (T2), CCS2 mode instruction (V6) is connected with the 3rd input (U33) of the second handover module (T2), the output (X17) of described the second handover module (T2) is connected with the FF input of the 2nd PID module adjuster (PID-2), the output (X19) of described the 2nd PID module adjuster (PID-2) is connected with second input (U29) of the first handover module (T1), the output (X22) of described the first handover module (T1) is connected with the A input of simulating manipulator (CZ)The output (X5) of a described PID module adjuster (PID-1) is connected with the first input end (U28) of the first handover module (T1), described CCS2 mode instruction (V6) is connected with the 3rd input (U30) of the first handover module (T1), described CCS2 mode instruction (V6) is connected with an input (U34) of door module (F2) with second, the output of boiler master automatic command (V5) is connected with an input (U26) of door module (F1) with first, described boiler master automatic command (V5) is connected with another input (U35) of door module (F2) with second, the input (U25) of described CCS2 mode instruction (V6) NAND gate module (N) is connected, the output (X15) of described not gate module (N) is connected with another input (U27) of door module (F1) with first, described first is connected with the TF input of a PID module adjuster (PID-1) with the output (X20) of door module (F1), the output (X4) of described the second addition module (B2) is connected with the SP input of analog regulator (CZ), described second is connected with the TF input of the 2nd PID module adjuster (PID-2) with the output (X18) of door module (F2), the O output of described analog regulator (CZ) is connected with boiler load instruction (X21), the A output of described analog regulator (CZ) is connected with boiler master automatic command (X23).
2. the boiler main of a kind of large electric power plant unit as described as right 1 is controlled system, it is characterized in that, described boiler is the large-scale pulverized coal firing boiler of direct-firing double inlet and outlet coal mill.
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| CN101718427B (en) * | 2009-12-09 | 2011-05-04 | 山西省电力公司电力科学研究院 | Control system of main steam pressure of large boiler |
| CN202132926U (en) * | 2011-04-29 | 2012-02-01 | 山西省电力公司电力科学研究院 | Control system for temperature of main steam of large-scale boiler |
| CN202486521U (en) * | 2012-03-06 | 2012-10-10 | 山西省电力公司电力科学研究院 | Boiler master control system of large fossil power generation unit |
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