CN108561875A - The control method of boiler drum level in the case of paired running water pump - Google Patents
The control method of boiler drum level in the case of paired running water pump Download PDFInfo
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- CN108561875A CN108561875A CN201810347472.2A CN201810347472A CN108561875A CN 108561875 A CN108561875 A CN 108561875A CN 201810347472 A CN201810347472 A CN 201810347472A CN 108561875 A CN108561875 A CN 108561875A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/78—Adaptations or mounting of level indicators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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Abstract
The present invention relates to a kind of control method of boiler drum level in the case of paired running water pump, using steam water-level as regulated variable, subloop is instructed using boiler feed capacity as regulated variable by the feedforward of major loop of main steam flow for (1) main control loop；(2) drum level measurement signal introduces steam drum pressure compensation calibration function；(3) output of main PID adjustment modules and feedwater flow carry out deviation calculating, it exports input of the result as secondary regulating loop, proportional integration calculating is carried out again, (4) boiler electrically driven feed pump is then using the steam feed pump outlet pressure that works as desired value, from the output of motion tracking steam feed pump, cooperation pneumatic pump completes boiler feedwater automatic adjustment jointly.The present invention introduces steam drum pressure compensation calibration function in drum level measurement circuit, improve the accuracy of drum level measurement, reduce influence of the false water level to adjustment process, electrically driven feed pump cooperation steam feed pump completes boiler feedwater task jointly, quickly steam water-level is maintained to be fluctuated in normal range (NR).
Description
Technical field
The invention belongs to thermal power generation automatic control technology field, boiler vapour in the case of especially a kind of paired running water pump
The control method of packet water level.
Background technology
Water Level in Power Plant Boiler Drums is the important indicator of boiler substance balance, in order to ensure the stable operation of station boiler,
Steam water-level must fluctuate in normal range (NR).Modernization boiler for high power station be by feedwater automatic control control system come
Ensure that steam water-level fluctuates in normal range (NR), station boiler feed pump routinely the steam feed pump of two 50% capacity of configuration and
The electrically driven feed pump of one 30% capacity, two steam feed pumps receive boiler feedwater automatic regulating system when boiler normal operation
The command synchronization that sends out changes rotational speed regulation steam water-level, but when a steam feed pump breaks down tripping or out of service
When, just must emergency start electrically driven feed pump to ensure boiler normal operation.At this time due to the output difference of two feed pumps with
And the governor performance of adjustment speed of feedwater is also different, is easy for if two feed pumps receive the same instruction paired running
Water phenomenon is mutually robbed in generation, cannot normally realize the automatic adjustment of boiler feedwater.
Invention content
The purpose of the present invention is in view of the deficiencies of the prior art, propose boiler drum water in the case of a kind of paired running water pump
The control method of position,
The present invention solves its technical problem and following technical scheme is taken to realize：
The control method of boiler drum level in the case of a kind of paired running water pump, station boiler drum corresponding to this method
100mm is normal water bit line under the dome course center line of water level equipment, and when boiler normal operation, steam water-level is in ordinary water level
It is fluctuated between ± the 50mm of line, high-temperature high-pressure boiler steam water-level is measured using single-compartment balance container, and the method comprising the steps of such as
Under：
(1) differential pressure of water level in equalizing reservoir reference end and drum between steam water interface is measured by differential pressure transmitter
Value, and carry out steam drum pressure compensation correction to it and calculate, steam water-level is finally obtained, according to balance differential pressure Computing Principle, drum
Water level compensation calculation formula is：
H=[L* (ρa-ρw)-ΔP*103]/(ρw-ρs)-0.5*L
Enable f1(x) (ρ is replaceda-ρw), f2(x) (ρ is replacedw-ρs), then steam water-level compensation calculation formula summary is：
H=[L*f1(x)-ΔP*103]/f2(x)-0.5*L
Wherein h is the value that steam water-level deviates ordinary water level, i.e. boiler drum level, unit mm
ρaIt is density (mean temperature generally take 80 DEG C) of the comparing water column in mean temperature, units/kg/m in equalizing reservoir3
ρwIt is the density of saturated water in drum, units/kg/m3
ρsIt is the density of saturated vapor in drum, units/kg/m3
Δ P corresponds to the differential pressure value of drum level measurement, unit mmH2O
Distance between L steam water sampling tube hubs, unit mm
Due to saturated water density p in drumw, saturated vapor density ρsAnd comparing water column density p in equalizing reservoiraIt is
The function of drum pressure, so f1(x) and f2(x) it can be fitted and be generated by following piecewise function respectively：
| Drum pressure (MPa) | 6 | 8 | 10 | 12 | 14 | 16 | 18 |
| ρa-ρw(kg/m3) | 955 | 943 | 931 | 918 | 902 | 882 | 858 |
| Drum pressure (MPa) | 6 | 8 | 10 | 12 | 14 | 16 | 18 |
| ρw-ρs(kg/m3) | 725 | 678 | 631 | 582 | 531 | 475 | 411 |
(2) the steam water-level setting value being arranged by boiler operatiopn person on duty and the water level measurements after steam drum pressure compensation into
Row deviation calculates, and deviation exports the input as main PID adjustment modules, and proportional, integral calculation process, main steam are carried out to it
Flow is inputted as the feedforward of main PID adjustment modules, is superimposed together as the defeated of main PID adjustment modules with feedback result of calculation
Go out, the mathematical descriptions of wherein major loop pid control module are：
Kp is rate mu-factor in formula, and Ti is time of integration unit
For the second, FF (s) is feedforward input variable, and E (s) is deviation input signal, and S is the Laplace transform factor, dimensionless；
(3) output of main PID adjustment modules and feedwater flow carry out deviation calculating, and output result is as secondary regulating loop
Input, then carry out proportional, integral calculating, output is used as steam feed pump control instruction, passes through and changes steam feed pump
Rotating speed changes feedwater flow, realizes the automatic regulation function of boiler drum level, wherein subloop PI proportional, integrals control module
Mathematical descriptions be：Kp is rate mu-factor in formula, and Ti is that time of integration unit is
Second, E (s) is input deviation signal, and S is the Laplace transform factor, dimensionless；
(4) setting alternative module receives A, B steam feed pump outlet pressure signal and steam-operating pump operation feedback letter simultaneously
Number, the outlet pressure of work pneumatic pump is automatically selected as output signal, i.e. A pump fortune according to steam-operating pump operation feedback signal data
Capable then A pump discharge pressures is selected to carry out deviation calculating as output signal and electrodynamic pump outlet pressure signal, deviation output is made
For the input of PI adjustment modules, proportional, integral calculation process is carried out to it, exports the regulating command as electrically driven feed pump,
Make it from the output of motion tracking steam feed pump, cooperation pneumatic pump completes the normal regulating of boiler drum level.
Moreover, the ratio-in the step (4) in the mathematical description and the step (3) of PI proportional, integral control modules
The mathematical descriptions of integral control module are identical.
The advantages and positive effects of the present invention are：
1, the present invention is under the unusual service conditions such as one steam feed pump emergency trip of boiler or ad hoc inspection and repair defect elimination, engaging pot
The dynamic characteristic of stove steam water-level introduces steam drum pressure compensation calibration function in drum level measurement circuit, improves steam water-level
The accuracy of measurement reduces influence of the false water level to adjustment process, improves the dynamic characteristic of the feed water system of boiler, improves boiler
The stability of water supply system avoids under boiler feed pump unusual service condition operations staff from adjusting steam water-level manually and the wind that generates
Danger, reduces the manipulation strength of unit operation personnel.
2, the present invention under the unusual service condition that one steam feed pump of unit breaks down remains to that unit is maintained steadily to transport
Row, boiler feedwater automatic control system whole can put into automatic running mode under the various operating conditions of subsidiary engine, quickly maintain
Steam water-level fluctuates in normal range (NR), still ensures that the technical indicator of general predictive control is better than under this operating mode《Fire
Power power plant analog control system Acceptance Test regulation》(DL/T657-2015) requirement.
Description of the drawings
Fig. 1 is the high-temperature high-pressure boiler single-compartment balance container measurement structural representation involved in the method for the present invention；
Fig. 2 is the logical relation block diagram of the method for the present invention.
Specific implementation mode
Present example is further described below：It is emphasized that embodiment of the present invention is illustrative
, without being restrictive, therefore the present invention is not limited to the embodiments described in specific implementation mode, every by this field skill
The other embodiment that art personnel obtain according to the technique and scheme of the present invention, also belongs to the scope of protection of the invention.
The control method of boiler drum level in the case of a kind of paired running water pump, as shown in Figure 1, electric corresponding to this method
100mm is normal water bit line (NWL), i.e. zero level scale, boiler under the dome course center line for boiler drum level equipment of standing
When normal operation, steam water-level fluctuates between ± the 50mm of normal water bit line, and high-temperature high-pressure boiler steam water-level uses single chamber
Equalizing reservoir measures, and it is as follows that the method comprising the steps of：
(1) differential pressure of water level in equalizing reservoir reference end and drum between steam water interface is measured by differential pressure transmitter
Value, and carry out steam drum pressure compensation correction to it and calculate, steam water-level is finally obtained, according to balance differential pressure Computing Principle, drum
Water level compensation calculation formula is：
H=[L* (ρa-ρw)-ΔP*103]/(ρw-ρs)-0.5*L
Enable f1(x) (ρ is replaceda-ρw), f2(x) (ρ is replacedw-ρs), then steam water-level compensation calculation formula summary is：
H=[L*f1(x)-ΔP*103]/f2(x)-0.5*L
Wherein h is the value that steam water-level deviates ordinary water level, i.e. boiler drum level, unit mm
ρaIt is density (mean temperature generally take 80 DEG C) of the comparing water column in mean temperature, units/kg/m in equalizing reservoir3
ρwIt is the density of saturated water in drum, units/kg/m3
ρsIt is the density of saturated vapor in drum, units/kg/m3
Δ P corresponds to the differential pressure value of drum level measurement, unit mmH2O
Distance between L steam water sampling tube hubs, unit mm
Due to saturated water density p in drumw, saturated vapor density ρsAnd comparing water column density p in equalizing reservoiraIt is
The function of drum pressure, so f1(x) and f2(x) it can be fitted and be generated by following piecewise function respectively：
| Drum pressure (MPa) | 6 | 8 | 10 | 12 | 14 | 16 | 18 |
| ρa-ρw(kg/m3) | 955 | 943 | 931 | 918 | 902 | 882 | 858 |
| Drum pressure (MPa) | 6 | 8 | 10 | 12 | 14 | 16 | 18 |
| ρw-ρs(kg/m3) | 725 | 678 | 631 | 582 | 531 | 475 | 411 |
(2) as shown in Fig. 2, the steam water-level setting value being arranged by boiler operatiopn person on duty and the water after steam drum pressure compensation
Position measured value carries out deviation calculating, and deviation exports the input as main PID adjustment modules, proportional, integral operation is carried out to it
Processing, main steam flow are inputted as the feedforward of main PID adjustment modules, are superimposed together as main PID tune with feedback result of calculation
The output of module is saved, the mathematical descriptions of wherein major loop pid control module are：
Kp is rate mu-factor in formula, and Ti is time of integration unit
For the second, FF (s) is feedforward input variable, and E (s) is deviation input signal, and S is the Laplace transform factor, dimensionless；
(3) output of main PID adjustment modules and feedwater flow carry out deviation calculating, and output result is as secondary regulating loop
Input, then carry out proportional, integral calculating, output is used as steam feed pump control instruction, passes through and changes steam feed pump
Rotating speed changes feedwater flow, realizes the automatic regulation function of boiler drum level, wherein subloop PI proportional, integrals control module
Mathematical descriptions be：Kp is rate mu-factor in formula, and Ti is that time of integration unit is
Second, E (s) is input deviation signal, and S is the Laplace transform factor, dimensionless；
(4) setting alternative module receives A, B steam feed pump outlet pressure signal and steam-operating pump operation feedback letter simultaneously
Number, the outlet pressure of work pneumatic pump is automatically selected as output signal, i.e. A pump fortune according to steam-operating pump operation feedback signal data
Capable then A pump discharge pressures is selected to carry out deviation calculating as output signal and electrodynamic pump outlet pressure signal, deviation output is made
For the input of PI adjustment modules, proportional, integral calculation process is carried out to it, exports the regulating command as electrically driven feed pump,
Make it from the output of motion tracking steam feed pump, cooperation pneumatic pump completes the normal regulating of boiler drum level.
Wherein, the mathematical description of PI proportional, integrals control module and the proportional, integral control module in the step (3)
Mathematical descriptions it is identical.
Claims (2)
1. the control method of boiler drum level in the case of a kind of paired running water pump, station boiler drum water corresponding to this method
100mm is normal water bit line under the dome course center line of position equipment, and when boiler normal operation, steam water-level is in normal water bit line
± 50mm between fluctuate, high-temperature high-pressure boiler steam water-level using single-compartment balance container measure, it is characterised in that this method packet
Include that steps are as follows：
(1) the differential pressure of water level value in equalizing reservoir reference end and drum between steam water interface is measured by differential pressure transmitter, and
Steam drum pressure compensation correction is carried out to it to calculate, finally obtains steam water-level, and according to balance differential pressure Computing Principle, steam water-level is mended
Repaying calculation formula is：
H=[L* (ρa-ρw)-ΔP*103]/(ρw-ρs)-0.5*L
Enable f1(x) (ρ is replaceda-ρw), f2(x) (ρ is replacedw-ρs), then steam water-level compensation calculation formula summary is：
H=[L*f1(x)-ΔP*103]/f2(x)-0.5*L
Wherein h is the value that steam water-level deviates ordinary water level, i.e. boiler drum level, unit mm
ρaIt is density (mean temperature generally take 80 DEG C) of the comparing water column in mean temperature, units/kg/m in equalizing reservoir3
ρwIt is the density of saturated water in drum, units/kg/m3
ρsIt is the density of saturated vapor in drum, units/kg/m3
Δ P corresponds to the differential pressure value of drum level measurement, unit mmH2O
Distance between L steam water sampling tube hubs, unit mm
Due to saturated water density p in drumw, saturated vapor density ρsAnd comparing water column density p in equalizing reservoiraIt is drum
The function of pressure, so f1(x) and f2(x) it can be fitted and be generated by following piecewise function respectively：
(2) the steam water-level setting value being arranged by boiler operatiopn person on duty carries out inclined with the water level measurements after steam drum pressure compensation
Difference calculates, and deviation exports the input as main PID adjustment modules, and proportional, integral calculation process, main steam flow are carried out to it
Feedforward as main PID adjustment modules inputs, and the output together as main PID adjustment modules is superimposed with feedback result of calculation,
The mathematical descriptions of middle major loop pid control module are：In formula Kp be than
Example amplification coefficient, Ti are that time of integration unit is the second, and FF (s) is feedforward input variable, and E (s) is deviation input signal, and S is to draw
The Laplace transform factor, dimensionless；
(3) output of main PID adjustment modules and feedwater flow carry out deviation calculating, and output result is defeated as secondary regulating loop
Enter, then carry out proportional, integral calculating, output is used as steam feed pump control instruction, by the rotating speed for changing steam feed pump
Change feedwater flow, realizes the automatic regulation function of boiler drum level, the wherein number of subloop PI proportional, integrals control module
Learning description formula is：Kp is rate mu-factor in formula, and Ti is that time of integration unit is second, E
(s) it is input deviation signal, S is the Laplace transform factor, dimensionless；
(4) setting alternative module receives A, B steam feed pump outlet pressure signal and steam-operating pump operation feedback signal, root simultaneously
The outlet pressure of work pneumatic pump is automatically selected according to steam-operating pump operation feedback signal data as output signal, i.e. A pump operations then
A pump discharge pressures are selected to carry out deviation calculating as output signal and electrodynamic pump outlet pressure signal, deviation output is used as PI
The input of adjustment module carries out it proportional, integral calculation process, exports the regulating command as electrically driven feed pump, makes it
From the output of motion tracking steam feed pump, cooperation pneumatic pump completes the normal regulating of boiler drum level.
2. the control method of boiler drum level in the case of paired running water pump according to claim 1, it is characterised in that：
The mathematical description of PI proportional, integral control modules and the proportional, integral control module in the step (3) in the step (4)
Mathematical descriptions it is identical.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631007A (en) * | 2018-11-22 | 2019-04-16 | 国网天津市电力公司电力科学研究院 | A kind of generating set boiler master system fuel feedback signal optimized treatment method |
| CN111828952A (en) * | 2020-07-23 | 2020-10-27 | 国网天津市电力公司电力科学研究院 | Control method for steam drum water level when electric and steam-driven water feeding pumps run in parallel |
| CN111853759A (en) * | 2019-04-30 | 2020-10-30 | 上海梅山钢铁股份有限公司 | Whole-process water supply control method for full-combustion gas boiler |
| CN112066360A (en) * | 2020-09-15 | 2020-12-11 | 万华化学集团股份有限公司 | Control method for steam drum liquid level display, storage medium and electronic equipment |
| CN112162482A (en) * | 2020-10-30 | 2021-01-01 | 广州能源检测研究院 | Intelligent combined optimization rectifying device and method suitable for complex flow field and application |
| CN112856381A (en) * | 2021-01-15 | 2021-05-28 | 华电电力科学研究院有限公司 | Steam drum water level control system of steam turbine generator set and control method thereof |
| CN112923350A (en) * | 2021-01-29 | 2021-06-08 | 广州东方电力有限公司 | Automatic paralleling method for water feeding pumps of thermal power plant |
| CN112947607A (en) * | 2021-03-18 | 2021-06-11 | 山西大学 | Water level control system and control method for water storage tank of supercritical CFB unit |
| CN113091038A (en) * | 2021-04-02 | 2021-07-09 | 杭州华电半山发电有限公司 | Method for coordinately controlling steam pressure and steam drum water level of waste heat boiler |
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| CN109631007B (en) * | 2018-11-22 | 2021-01-26 | 国网天津市电力公司电力科学研究院 | Fuel feedback signal optimization processing method for generator set boiler master control system |
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| CN111853759B (en) * | 2019-04-30 | 2022-06-10 | 上海梅山钢铁股份有限公司 | Whole-process water supply control method for full-combustion gas boiler |
| CN111853759A (en) * | 2019-04-30 | 2020-10-30 | 上海梅山钢铁股份有限公司 | Whole-process water supply control method for full-combustion gas boiler |
| CN111828952A (en) * | 2020-07-23 | 2020-10-27 | 国网天津市电力公司电力科学研究院 | Control method for steam drum water level when electric and steam-driven water feeding pumps run in parallel |
| CN112066360A (en) * | 2020-09-15 | 2020-12-11 | 万华化学集团股份有限公司 | Control method for steam drum liquid level display, storage medium and electronic equipment |
| CN112066360B (en) * | 2020-09-15 | 2023-09-19 | 万华化学集团股份有限公司 | Control method for drum liquid level display, storage medium and electronic equipment |
| CN112162482A (en) * | 2020-10-30 | 2021-01-01 | 广州能源检测研究院 | Intelligent combined optimization rectifying device and method suitable for complex flow field and application |
| CN112856381A (en) * | 2021-01-15 | 2021-05-28 | 华电电力科学研究院有限公司 | Steam drum water level control system of steam turbine generator set and control method thereof |
| CN112923350B (en) * | 2021-01-29 | 2023-02-28 | 广州东方电力有限公司 | Automatic parallel method for feed pumps of thermal power plant |
| CN112923350A (en) * | 2021-01-29 | 2021-06-08 | 广州东方电力有限公司 | Automatic paralleling method for water feeding pumps of thermal power plant |
| CN112947607A (en) * | 2021-03-18 | 2021-06-11 | 山西大学 | Water level control system and control method for water storage tank of supercritical CFB unit |
| CN113091038A (en) * | 2021-04-02 | 2021-07-09 | 杭州华电半山发电有限公司 | Method for coordinately controlling steam pressure and steam drum water level of waste heat boiler |
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