CN103277150B - Method for energy-saving optimization of operation of fan of direct air-cooling system of power plant - Google Patents
Method for energy-saving optimization of operation of fan of direct air-cooling system of power plant Download PDFInfo
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- CN103277150B CN103277150B CN201310216761.6A CN201310216761A CN103277150B CN 103277150 B CN103277150 B CN 103277150B CN 201310216761 A CN201310216761 A CN 201310216761A CN 103277150 B CN103277150 B CN 103277150B
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Abstract
The invention discloses a method for energy-saving optimization of operation of a fan of a direct air-cooling system of a power plant. Data collection is realized by the aid of multiple steam turbine steam discharging pressure sensors and a direct air-cooling system fan total power sensor which are arranged on a power plant unit, and data are transmitted to a data collection unit and a calculation and display unit bidirectionally connected with the data collection unit. An optimal operation scheme is determined by a formula shown in the description. By the method, the problem of determining of the optimal operation scheme of the fan of the direct air-cooling unit air-cooling system is solved, the method is simple and convenient in measuring, and a guide can be provided for determining the optimal operation scheme of the direct air-cooling system on an operation site.
Description
Technical field
The present invention relates to the energy conservation optimizing method of a kind of power plant direct air cooling system fan operation.
Background technique
Along with the pressure of national energy-saving and reduction of discharging strengthens, improve existing operating unit, especially the performance driving economy of Direct Air-cooled Unit, especially the running optimizatin of direct air cooling system blower fan, obtain power plant and more and more pay attention to.This master be because: (1) Air-cooled Unit is compared with wet type cooling unit, and because steam turbine exhaust pressure is higher, the Economy of unit is poor; (2) Air-cooled Unit is compared with wet type cooling unit, and it is obvious that it runs the impact being subject to environmental conditions, as the exhaust steam pressure excursion of air cooling turbine at 8kPa to 30kPa; (3) the air-blower control rotating speed of direct air cooling system generally adopts Frequency to regulate, and the operating scheme of rotation speed of fan is more, has larger energy-saving potential after determining the operating scheme optimized.
Summary of the invention
The technical problem to be solved in the present invention is to provide the energy conservation optimizing method that a kind of method is simple, measure more convenient power plant accurately direct air cooling system fan operation.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the energy conservation optimizing method of a kind of power plant direct air cooling system fan operation, and its key technology is: the method completes by following apparatus: comprise measuring unit, data acquisition unit and calculating and display unit;
Described measuring unit comprises 2 ~ 4 the direct air cooling system blower fan total output transmitters being installed on Air-Cooling Island blower fan transformer entrance location, 2-4 the gas turbine exhaust gas pressure transducer being installed on turbine low pressure cylinder and steam exhaust device interface position, the respective input of the output termination data acquisition unit of described power transducer and pressure transducer, the output termination calculating of described data acquisition unit and the input end of display unit;
Adopt the step of said apparatus determination direct air cooling system blower fan optimized operation scheme as follows:
1) measuring unit, data acquisition unit and calculating and display unit is connected, and keep the stable condition of steam turbine admission valve position and Operational Limits at unit under, gather the steam turbine exhaust pressure under different fan operation rotating speed and air cooling system blower fan total output data;
2) changing value of the net power Pgn under two kinds of fan operation rotating speeds is compared
, when
during >0, represent that net power increases, namely, a kind of rotating speed of operating scheme is preferred;
Wherein,
calculating adopt following formula:
（1）
In above-mentioned formula (1), net power Pgn adopts following formulae discovery:
（2）；
In formula (2), Pgn is unit net power, unit kW; Pg is generated output, unit kW; Pacc is air cooling system blower fan total output, unit kW;
The changing value of the expression variable of band △ in formula (1), footmark 2 represents second rotation speed of fan, and footmark 1 represents first rotation speed of fan;
The change of unit generation power in formula (1)
calculated by following formula:
（3）
In formula (3),
after representing rotation speed of fan adjustment, the changing value of steam turbine exhaust pressure, unit kPa, k are linear coefficient, and the fair curve provided by steam turbine producer obtains;
Air cooling system blower fan consumes the change of total output
can be calculated by following formula:
；（4）
In formula (4), Pacc2 is that under second rotation speed of fan, air cooling system consumes total output, and Pacc1 is that under first rotation speed of fan, air cooling system consumes total output.
The model of above-mentioned data acquisition unit is OM-CP-OCTPROCESS.
The know-why that the present invention adopts is as follows:
The generated output of steam turbine set and the change of steam turbine exhaust pressure parameter closely related, under and condition that steam inlet condition is certain certain in steam turbine admission valve position, the relation between unit generation changed power and steam turbine exhaust pressure change can be expressed as:
When px is greater than unit operation obstruction back pressure, above-mentioned function relation is generally linear approximate relationship, can be expressed as:
Pg is unit generation power, unit kW; Px is steam turbine exhaust pressure, unit kPa; K is linear coefficient, and the fair curve that can be provided by steam turbine producer obtains.
When considering the rotation speed of fan adjustment of direct air cooling system, the change due to air cooling system cooling air quantity causes the change of steam turbine exhaust pressure, and then has an impact to steam turbine power generation power.On the other hand, due to the change of rotation speed of fan, also change is created to the total output of direct air cooling system blower fan consumption.Therefore, when determining the optimized operation scheme of direct air cooling system under a certain specific run condition, its essence is the maximum value determining net power Pgn.
Pgn represents that steam turbine power generation power deducts direct air cooling system blower fan and consumes the net power after total output, unit kW; Pacc represents that direct air cooling system blower fan consumes total output, unit kW.
Net power Pgn value relatively under two kinds of fan operation rotating speeds, can be expressed as:
when
during >0, represent that net power increases, the rotating speed of rear a kind of operating scheme is preferred.
The change of unit generation power is by formula
can calculate,
after representing rotation speed of fan adjustment, the changing value of steam turbine exhaust pressure, unit kPa.
The change of air cooling system blower fan consumption total output can by formula
calculate.
The beneficial effect adopting technique scheme to produce is:
The present invention is by after measurement direct air-cooling turbine exhaust steam pressure, direct air cooling system blower fan total output data, stored by data acquisition unit process, finally in calculating and display unit, realize data display, computing, determine the optimized operation scheme of direct air cooling system blower fan.Adopt the inventive method to solve the problem identificatioin of the optimized operation scheme of Direct Air-cooled Unit air cooling system blower fan, not only Measures compare is simple, and measures conveniently, can determine that direct air cooling system optimized operation scheme provides guidance for running scene.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is unit generation net power
with the change curve of rotation speed of fan n.
Embodiment
See Fig. 1, the present invention has come by set of device, and described device comprises measuring unit, data acquisition unit and calculating and display unit;
Described measuring unit is made up of the multiple steam turbine exhaust pressure sensor be arranged in Power Plant and direct air cooling system blower fan total output sensor;
The output terminal of described sensor connects the input end of data acquisition unit respectively, and the output signal of sensor is 4-20mA signal;
The output termination calculating of described data acquisition unit and the input end of display unit.Described calculating and display unit are notebook computer or host computer and display device.Described notebook computer or host computer are mounted with special-purpose software, carry out relevant data acquisition and calculating.
The model of described data acquisition unit is OM-CP-OCTPROCESS.The parameter of this device is as follows:
Specification: 8 passage portable data acquisition and recording devices
Input: can accept 8 channel input signals, input signal comprises: current signal 0-24mA;
Testing precision: current signal: range 0-24mA, resolution 0.47 μ A, degree of accuracy ± 0.5% all-range;
Power supply: inner chargeable Ni-MH battery, voltage 7.2Vdc.
Communication interface: USB1.1
Manufacturer: OMEGA company of the U.S..
The mode that all sensor connect lines are fastened by bolts is fixed on the terminal of described data acquisition unit.Described data acquisition unit is connected with the mode by usb communication line between flow rate calculation and display unit, and communications protocol adopts USB 1.1.
The process of patent determination direct air cooling system blower fan optimized operation scheme of the present invention is as follows:
1) measuring unit, data acquisition unit, calculating and display unit is connected on request;
2) under the stable state of unit operation, perform following operation, keep the stable of steam turbine admission valve position and Operational Limits during operation, then operation is as follows:
Related software in start-up simulation and display unit;
Select the air cooling system rotation speed of fan n needing to gather in software
iamount of projects;
Adjustment air cooling blower fan rotating speed, to specifying rotating speed, monitors the real-time curve of acquisition parameter, presses " starting to gather " and " terminating to gather " button, specify the data of rotating speed operating scheme operating mode to gather to direct air cooling system after parameter stability;
Repeat aforesaid operations, until gather operating mode quantity to reach setting amount of projects.
3) to the image data of above-mentioned adjacent two operating conditionss, net power changing value is calculated according to the scheme of the computational methods of the invention described above.According to the calculating data finally calculated, banknotes-system goes out the curve of net power change with blower fan rotation speed change, see accompanying drawing 2.
4) according to banknotes-system curve, the optimum energy-saving run scheme of unit direct air cooling system blower fan under specific steam turbine admission valve position and Operational Limits can be determined.As in accompanying drawing 2 schematic diagram, calculate according to survey data under 6 rotating speeds
in data,
,
,
be on the occasion of, therefore, n2 rotating speed scheme is better than n1 rotating speed scheme; N3 rotating speed scheme is better than n2 rotating speed scheme; N4 rotating speed scheme is better than n3 rotating speed scheme.
,
be negative value, therefore, n5 rotating speed scheme is inferior to n4 rotating speed scheme; N6 rotating speed scheme is inferior to n5 rotating speed scheme.In sum, under n4 rotating speed, operating scheme is optimum.
Claims (2)
1. an energy conservation optimizing method for power plant's direct air cooling system fan operation, is characterized in that: the method completes by following apparatus: comprise measuring unit, data acquisition unit and calculating and display unit;
Described measuring unit comprises 2 ~ 4 the direct air cooling system blower fan total output transmitters being installed on Air-Cooling Island blower fan transformer entrance location, 2-4 the steam turbine exhaust pressure sensor being installed on turbine low pressure cylinder and steam exhaust device interface position, the respective input of the output termination data acquisition unit of described power transducer and pressure transducer, the output termination calculating of described data acquisition unit and the input end of display unit;
Adopt the step of said apparatus determination direct air cooling system blower fan optimized operation scheme as follows:
1) measuring unit, data acquisition unit and calculating and display unit is connected, and keep the stable condition of steam turbine admission valve position and Operational Limits at unit under, gather the steam turbine exhaust pressure under different fan operation rotating speed and air cooling system blower fan total output data;
2) changing value of the net power Pgn under two kinds of fan operation rotating speeds is compared
, when
during >0, represent that net power increases, namely, a kind of rotating speed of operating scheme is preferred;
Wherein,
calculating adopt following formula:
（1）
In above-mentioned formula (1), net power Pgn adopts following formulae discovery:
（2）；
In formula (2), Pgn is unit net power, unit kW; Pg is generated output, unit kW; Pacc is air cooling system blower fan total output, unit kW;
The changing value of the expression variable of band △ in formula (1), each power parameter that footmark 2 is corresponding under representing second rotation speed of fan, each power parameter that footmark 1 is corresponding under representing first rotation speed of fan;
The change of unit generation power in formula (1)
calculated by following formula:
（3）
In formula (3),
after representing rotation speed of fan adjustment, the changing value of steam turbine exhaust pressure, unit kPa, k are linear coefficient, and the fair curve provided by steam turbine producer obtains;
Air cooling system blower fan consumes the change of total output
can be calculated by following formula:
；（4）
In formula (4), Pacc2 is that under second rotation speed of fan, air cooling system consumes total output, and Pacc1 is that under first rotation speed of fan, air cooling system consumes total output.
2. the energy conservation optimizing method of power plant according to claim 1 direct air cooling system fan operation, is characterized in that: the model of described data acquisition unit is OM-CP-OCTPROCESS.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105157444B (en) * | 2015-03-30 | 2019-07-23 | 武汉理工大学 | Direct-type Air-Cooling Island axial flow blower intelligent control method and system |
| CN109472408A (en) * | 2018-11-02 | 2019-03-15 | 北京华亿宏图节能环保工程有限公司 | A kind of thermal power generation unit cold end management pad optimization regulating system |
| CN111503036B (en) * | 2019-01-30 | 2022-02-08 | 新奥数能科技有限公司 | Performance optimization method and device of air cooling unit, readable medium and electronic equipment |
| CN111306956B (en) * | 2020-02-10 | 2021-08-06 | 山东电力工程咨询院有限公司 | System and method for controlling exhaust steam pressure of direct air cooling unit |
| CN113095545B (en) * | 2021-03-12 | 2022-09-20 | 国网河北能源技术服务有限公司 | Method and device for determining optimal operating frequency of cooling fan of air-cooled condenser and terminal |
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| US3428242A (en) * | 1967-06-02 | 1969-02-18 | United Aircraft Corp | Unitary simple/bootstrap air cycle system |
| CN102538500A (en) * | 2012-03-09 | 2012-07-04 | 保定市伊莱克科技有限公司 | Energy-saving cooling method and system for reducing exhaust steam pressure of air-cooled unit in power plant |
| CN202810978U (en) * | 2012-09-13 | 2013-03-20 | 山西三元和能源科技有限公司 | System for dragging air blower/pump/compressor of condensing steam turbine |
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| JP2006250068A (en) * | 2005-03-11 | 2006-09-21 | Babcock Hitachi Kk | Fan operation monitoring device |
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| US3428242A (en) * | 1967-06-02 | 1969-02-18 | United Aircraft Corp | Unitary simple/bootstrap air cycle system |
| CN102538500A (en) * | 2012-03-09 | 2012-07-04 | 保定市伊莱克科技有限公司 | Energy-saving cooling method and system for reducing exhaust steam pressure of air-cooled unit in power plant |
| CN202810978U (en) * | 2012-09-13 | 2013-03-20 | 山西三元和能源科技有限公司 | System for dragging air blower/pump/compressor of condensing steam turbine |
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