CN113095545A - Method and device for determining optimal operating frequency of cooling fan of air-cooled condenser and terminal - Google Patents

Method and device for determining optimal operating frequency of cooling fan of air-cooled condenser and terminal Download PDF

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CN113095545A
CN113095545A CN202110268546.5A CN202110268546A CN113095545A CN 113095545 A CN113095545 A CN 113095545A CN 202110268546 A CN202110268546 A CN 202110268546A CN 113095545 A CN113095545 A CN 113095545A
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power
cooled condenser
cooling fan
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CN113095545B (en
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杨海生
李路江
杜威
王志强
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
State Grid Hebei Energy Technology Service Co Ltd
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Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
State Grid Hebei Energy Technology Service Co Ltd
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Abstract

The invention is suitable for the technical field of air-cooled condensers and provides a method, a device and a terminal for determining the optimal operating frequency of a cooling fan of an air-cooled condenser. Wherein, the method comprises the following steps: acquiring a first operating frequency of a cooling fan of the air-cooled condenser and a first net power of a cold end system corresponding to the first operating frequency; carrying out frequency adjustment of a preset variable quantity on the first operating frequency to obtain a second operating frequency; calculating a second net power of the cold end system corresponding to the second operating frequency; if the second net power of the cold end system is not larger than the first net power of the cold end system, taking the first operation frequency as the current optimal operation frequency; and if the second net power of the cold end system is greater than the first net power of the cold end system, enabling the first operating frequency to be equal to the second operating frequency, and skipping to the step of carrying out frequency adjustment of preset variable quantity on the first operating frequency to obtain the second operating frequency. The invention can determine the operation frequency of the cooling fan which can maximize the net power of the cold end system.

Description

Method and device for determining optimal operating frequency of cooling fan of air-cooled condenser and terminal
Technical Field
The invention belongs to the technical field of air-cooled condensers, and particularly relates to a method, a device and a terminal for determining the optimal operating frequency of a cooling fan of an air-cooled condenser.
Background
The air-cooled condenser is used as the most important heat exchanger equipment of the direct air-cooled unit of the power plant and plays an important role in radiating the exhaust heat of the unit to the environment. Along with the development of the power unit to high capacity and high parameter, the working performance of the air cooling condenser in the power plant has more and more great influence on the economy of the power plant. Taking a steam turbine of a 600MW direct air cooling unit as an example, the power generation coal consumption of a power plant is directly increased by about 1 g/kW.h when the pressure of an air cooling condenser is increased by 1 kPa.
However, at present, as the frequency parameter of the air cooling fan for adjusting the performance of the air cooling condenser, the influence of the frequency parameter on the performance of the air cooling condenser cannot be accurately and quantitatively evaluated, so that many difficulties are faced when determining the optimal cooling fan frequency for maximizing the net power of a cold end system on site, and a corresponding solution is urgently needed.
Disclosure of Invention
In view of the above, the present invention provides a method, an apparatus, and a terminal for determining an optimal operating frequency of a cooling fan of an air-cooled condenser, so as to determine a cooling fan frequency that maximizes a net power of the air-cooled condenser.
The first aspect of the embodiment of the invention provides a method for determining the optimal operating frequency of a cooling fan of an air-cooling condenser, which comprises the following steps:
acquiring a first operating frequency of a cooling fan of the air-cooled condenser and a first net power of a cold end system corresponding to the first operating frequency;
performing frequency adjustment of a preset variable quantity on the first operating frequency to obtain a second operating frequency, wherein the first operating frequency and the second operating frequency are both in a preset frequency range;
calculating a second net power of the cold end system corresponding to the second operating frequency;
if the second net power of the cold end system is not larger than the first net power of the cold end system, taking the first operation frequency as the current optimal operation frequency;
and if the second net power of the cold end system is greater than the first net power of the cold end system, enabling the first operating frequency to be equal to the second operating frequency, and skipping to the step of carrying out frequency adjustment of preset variable quantity on the first operating frequency to obtain the second operating frequency.
Optionally, calculating the second net power of the cold end system corresponding to the second operating frequency comprises
Calculating a second total power consumption of the cooling fan corresponding to a second operating frequency according to the first total power consumption of the cooling fan corresponding to the first operating frequency;
calculating a second pressure value of the air-cooled condenser corresponding to the second operating frequency;
calculating second power generation power corresponding to the second operating frequency according to the second pressure value of the air-cooled condenser;
and calculating second net power of the cold end system according to the second total power consumption of the cooling fan and the second generated power.
Optionally, calculating the second total consumed power of the cooling fan corresponding to the second operating frequency includes:
calculating second total power consumption of the cooling fan according to a preset second total power consumption formula of the cooling fan, wherein the second total power consumption formula of the cooling fan is as follows:
Figure BDA0002973304880000021
wherein, PL'represents a second total power consumption of the cooling fan, f' represents a second operating frequency, PLThe first total power consumption of the cooling fan is shown, and n is a characteristic index of the air-cooled condenser.
Optionally, calculating a second pressure value corresponding to the second operating frequency includes:
calculating the characteristic coefficient of the air-cooled condenser according to a preset characteristic coefficient formula, wherein the characteristic coefficient formula is as follows:
Figure BDA0002973304880000022
wherein Γ represents a characteristic coefficient of the air-cooled condenser; NTUGThe number of the heat exchange units of the air-cooled condenser under the rated working condition is represented;
calculating the performance influence coefficient of the fan power consumption corresponding to the first operating frequency on the air-cooled condenser according to a preset first influence coefficient formula, wherein the first influence coefficient formula is as follows:
Figure BDA0002973304880000031
wherein, K2A coefficient of influence f of the fan power consumption corresponding to the first operating frequency on the performance of the air-cooled condenserGRepresenting the operating frequency of the design working condition;
calculating the performance influence coefficient of the fan power consumption corresponding to the second operating frequency on the air-cooled condenser according to a preset second influence coefficient formula, wherein the second influence coefficient formula is as follows:
Figure BDA0002973304880000032
wherein, K'2Representing the performance influence coefficient of the fan power consumption corresponding to the second operating frequency on the air-cooled condenser;
and calculating the steam turbine exhaust flow corresponding to the second operating frequency according to a preset exhaust flow calculation formula in the design performance state, wherein the exhaust flow calculation formula is as follows:
Figure BDA0002973304880000033
wherein, F'exhIndicating the steam turbine discharge flow corresponding to the second operating frequency, FexhRepresenting the steam turbine exhaust flow corresponding to the first operating frequency;
obtaining a current ambient temperature
And searching the steam turbine exhaust flow corresponding to the second operating frequency and the condenser pressure corresponding to the current ambient temperature in a preset air-cooled condenser performance curve.
Optionally, calculating a second power generation corresponding to the second operating frequency according to the second pressure value includes:
calculating the variable quantity of the generating power of the air-cooled condenser at the first operating frequency and the second operating frequency according to a preset generating power variable quantity calculation formula and the influence coefficient of the steam turbine exhaust pressure on the unit power, wherein the generating power variable quantity calculation formula is as follows:
ΔPg＝Kp×(pc′-pc)
wherein, Δ PgRepresents the variation of the power generation of the air-cooled condenser at the first and second operating frequencies, pcThe pressure value p of the air-cooled condenser corresponding to the first operating frequency is shownc' represents the pressure value of the air-cooling condenser corresponding to the second operating frequency;
and calculating second generating power corresponding to the second operating frequency according to a preset second generating power calculation formula and the variation of the group generating power of the air-cooled condenser at the first operating frequency and the second operating frequency, wherein the second generating power calculation formula is as follows:
Pg′＝Pg+ΔPg
wherein, Pg' denotes a second power generation power corresponding to the second operation frequency.
Optionally, calculating the second net power of the cold-end system according to the second total power consumption of the cooling fan and the second generated power includes:
and calculating second net power of the cold end system according to a preset second net power calculation formula, wherein the second net power calculation formula is as follows:
P′net＝P′g-PL′
wherein, P'netRepresenting the second net power of the cold side system.
Optionally, calculating an influence coefficient of the steam turbine exhaust pressure on the unit power includes:
determining the influence coefficient of the steam turbine exhaust pressure on the unit power according to a preset exhaust pressure influence coefficient calculation formula and a preset unit power-steam turbine exhaust pressure curve, wherein the exhaust pressure influence coefficient calculation formula is as follows:
Figure BDA0002973304880000041
wherein, Pg1、Pg2Respectively, is the corresponding p on the performance curves1、ps2Unit power under exhaust pressure; p is a radical ofs1、ps2Respectively, the exhaust pressures of two turbines on the performance curve, and ps1To ps2Including p between the exhaust pressure zonescTo pc' pressure interval.
A second aspect of an embodiment of the present invention provides an apparatus for determining an optimal operating frequency of a cooling fan of an air-cooled condenser, including:
the acquiring module is used for acquiring a first operating frequency of a cooling fan of the air-cooled condenser and a first net power corresponding to the first operating frequency;
the frequency adjusting module is used for carrying out frequency adjustment of a preset variable quantity on the first operating frequency to obtain a second operating frequency, wherein the first operating frequency and the second operating frequency are both in a preset frequency range;
the power calculation module is used for calculating second net power corresponding to the second operating frequency;
a comparison module for taking the first operation frequency as the current optimum operation frequency when the second net power is not larger than the first net power,
or when the second net power is greater than the first net power, making the first operating frequency equal to the second operating frequency, and skipping to the step of performing frequency adjustment with a preset variation on the first operating frequency to obtain the second operating frequency.
A third aspect of the embodiments of the present invention provides a terminal, including a memory, a processor, and a computer program stored in the memory and operable on the processor, where the processor, when executing the computer program, implements the steps of the method for determining the optimal operating frequency of the cooling fan of any air-cooling condenser.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps of any method for determining an optimal operating frequency of a cooling fan of an air-cooling condenser.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for determining the optimal operating frequency of a cooling fan of an air-cooled condenser, which comprises the following steps: acquiring a first operating frequency of a cooling fan of the air-cooled condenser and a first net power of a cold end system corresponding to the first operating frequency; performing frequency adjustment of a preset variable quantity on the first operating frequency to obtain a second operating frequency, wherein the first operating frequency and the second operating frequency are both in a preset frequency range; calculating a second net power of the cold end system corresponding to the second operating frequency; if the second net power of the cold end system is not larger than the first net power of the cold end system, taking the first operation frequency as the current optimal operation frequency; and if the second net power of the cold end system is greater than the first net power of the cold end system, enabling the first operating frequency to be equal to the second operating frequency, and skipping to the step of carrying out frequency adjustment of preset variable quantity on the first operating frequency to obtain the second operating frequency. According to the method, the second operation frequency and the corresponding second net power are calculated through the first operation frequency and the preset variable quantity, and then the first net power and the second net power are compared, so that the optimal operation frequency of the cooling fan, which enables the net power of the cold end system to be maximum, can be determined.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart of an implementation of a method for determining an optimal operating frequency of a cooling fan of an air-cooled condenser according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an optimal operating frequency determining device for a cooling fan of an air-cooled condenser according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, it shows a flowchart of an implementation of the method for determining the optimal operating frequency of the cooling fan of the air-cooled condenser according to the embodiment of the present invention, which is detailed as follows:
as shown in fig. 1, the method for determining the optimal operating frequency of the cooling fan of the air-cooled condenser includes:
step 101, acquiring a first operating frequency of a cooling fan of an air-cooled condenser and a first net power of a cold end system corresponding to the first operating frequency;
102, performing frequency adjustment of a preset variable quantity on the first operating frequency to obtain a second operating frequency, wherein the first operating frequency and the second operating frequency are both in a preset frequency range;
103, calculating second net power of the cold end system corresponding to the second operating frequency;
step 104, if the second net power of the cold end system is not more than the first net power of the cold end system, taking the first running frequency as the current optimal running frequency;
and 105, if the second net power of the cold end system is greater than the first net power of the cold end system, making the first operating frequency equal to the second operating frequency, and skipping to the step of carrying out frequency adjustment of preset variable quantity on the first operating frequency to obtain the second operating frequency.
In this embodiment, the initial value of the first operating frequency may be a maximum value or a minimum value in a preset frequency range, and when the first operating frequency is the maximum value in the preset range, the first operating frequency is subtracted by a preset variation to obtain a second operating frequency; and when the first operating frequency takes the minimum value in the preset range, adding a preset variable quantity to the first operating frequency to obtain a second operating frequency. The preset frequency range can be 20 Hz-55 Hz, and the net power corresponding to the maximum value or the minimum value in the preset frequency range is a known quantity.
The calculation parameters used in this embodiment further include:
(1) design condition data of air-cooled condenser, including operating frequency f of all fansGAnd total power consumption P of air-cooled condenser fanLGAnd condenser pressure pcGSteam turbine exhaust flow FexhGAmbient pressure pLGAnd the ambient temperature tL1G。
(2) The real-time operation data of the air-cooling condenser comprises the generating power Pg of the unit, the operating frequency f of the fan and the total power consumption P of the fan of the air-cooling condenserLAnd condenser pressure pcSteam turbine exhaust flow FexhtAmbient pressure pLAnd the ambient temperature tL1。
In a specific embodiment, the following steps may be employed to calculate the optimal operating frequency:
(1) and respectively carrying out upward optimization and downward optimization, and comparing the optimal operating frequencies obtained by the two methods, wherein the larger one is used as the final optimal operating frequency.
1) Upward optimization:
a. assuming the frequency f' of the cooling fan of the air-cooling condenser, and f ═ f + Δ f, calculating the total power consumption P of the cooling fan at the assumed frequencyL'. Δ f is a preset frequency variation.
b. Calculating the condenser pressure value p under the assumed air cooling condenser cooling fan frequencyc'and calculating new unit generated power Pg'.
c. Judging whether the net power of the comparison unit has Pnet ' > Pnet, if yes, the optimal running frequency of the fan is f ', the optimal frequency is higher than the current running frequency, continuously optimizing upwards, and turning to the step a if f is set to be f '; if the frequency is not satisfied, the optimal operation frequency of the fan is f.
2) Downward optimization:
a. assuming the frequency f' of the cooling fan of the air-cooling condenser, and f ═ f-delta f, calculating the total power consumption P of the cooling fan at the assumed frequencyL’。
b. Calculating the condenser pressure value p under the assumed air cooling condenser cooling fan frequencyc'and calculating new unit generated power Pg'.
c. Judging whether the net power of the comparison unit has Pnet ' > Pnet, if yes, the optimal running frequency of the fan is f ', the optimal frequency is lower than the current running frequency, continuing to optimize downwards, setting f to be f ', and turning to the step a; if the frequency is not satisfied, the optimal operation frequency of the fan is f.
(2) The upward optimization and the downward optimization are carried out simultaneously:
a. assuming the frequency f of the cooling fan of the air-cooled condenser+And f-And f is+＝f+△f，f-Calculating the total power consumption P of the cooling fan at the assumed frequencyL+And PL-。
b. Calculating the condenser pressure value p under the assumed air cooling condenser cooling fan frequencyc+And pc-And calculating the new generating power P of the unitg+And Pg-。
c. Determination and comparison of f and f+And f-The corresponding net power Pnet of the unit,Selecting the maximum value of the Pnet + and the Pnet-, determining the optimal operating frequency of the fan, and finishing the optimization of the cooling fan frequency when the Pnet is the maximum value; otherwise, the frequency change direction corresponding to the maximum value of the net power is continuously optimized.
Optionally, calculating the second net power corresponding to the second operating frequency includes:
calculating a second total power consumption of the cooling fan corresponding to a second operating frequency according to the first total power consumption of the cooling fan corresponding to the first operating frequency;
calculating a second pressure value of the air-cooled condenser corresponding to the second operating frequency;
calculating second power generation power corresponding to the second operating frequency according to the second pressure value of the air-cooled condenser;
and calculating second net power of the cold end system according to the second total power consumption of the cooling fan and the second generated power.
Optionally, calculating the second total consumed power corresponding to the second operating frequency includes:
calculating second total power consumption of the cooling fan according to a preset second total power consumption formula of the cooling fan, wherein the second total power consumption formula of the cooling fan is as follows:
Figure BDA0002973304880000091
wherein, PL'represents a second total power consumption of the cooling fan, f' represents a second operating frequency, PLThe first total power consumption of the cooling fan is shown, and n is a characteristic index of the air-cooled condenser.
In this embodiment, the derivation process of this formula is:
according to the fan efficiency under two kinds of frequencies of frequency conversion cooling fan unchangeably, exist:
Figure BDA0002973304880000092
considering only the change of the running frequency of the fan, the method can be converted into the following steps:
Figure BDA0002973304880000093
in the formula, f and f' are the running frequencies of the fan in two states, and the unit is Hz; v, V' is the volume flow of the fan in two states, unit m3/h；ρL、ρLThe air density at the inlet of the fan is in unit kg/m under two states3(ii) a PL and PL' are the power consumed by the fan in kW under two states. And n is the characteristic coefficient of the air-cooled condenser and takes the value of 0.33.
Optionally, calculating a second pressure value corresponding to the second operating frequency includes:
calculating the characteristic coefficient of the air-cooled condenser according to a preset characteristic coefficient formula, wherein the characteristic coefficient formula is as follows:
Figure BDA0002973304880000094
wherein Γ represents a characteristic coefficient of the air-cooled condenser; NTUGThe number of the heat exchange units of the air-cooled condenser under the rated working condition is represented;
calculating the performance influence coefficient of the fan power consumption corresponding to the first operating frequency on the air-cooled condenser according to a preset first influence coefficient formula, wherein the first influence coefficient formula is as follows:
Figure BDA0002973304880000095
wherein, K2A coefficient of influence f of the fan power consumption corresponding to the first operating frequency on the performance of the air-cooled condenserGRepresenting the operating frequency of the design working condition;
calculating the performance influence coefficient of the fan power consumption corresponding to the second operating frequency on the air-cooled condenser according to a preset second influence coefficient formula, wherein the second influence coefficient formula is as follows:
Figure BDA0002973304880000101
wherein, K'2Representing the performance influence coefficient of the fan power consumption corresponding to the second operating frequency on the air-cooled condenser;
and calculating the steam turbine exhaust flow corresponding to the second operating frequency according to a preset exhaust flow calculation formula in the design performance state, wherein the exhaust flow calculation formula is as follows:
Figure BDA0002973304880000102
wherein, F'exhIndicating the steam turbine discharge flow corresponding to the second operating frequency, FexhRepresenting the steam turbine exhaust flow corresponding to the first operating frequency;
in this embodiment, FexhThe unit kg/s refers to the corresponding turbine exhaust flow under the operating condition of environmental pressure pL1, environmental air inlet temperature tL1 and condenser pressure pc under the designed performance state of the air-cooling condenser, and can be found according to the performance curve of the air-cooling condenser provided by a manufacturer;
calculating the pressure t of the air-cooled condenser in the design performance state and the operating conditionL1Ambient air inlet temperature tL1And the corresponding steam turbine exhaust flow F when the frequency F' of the cooling fan is assumedex', using the formula:
by the formula
Fexhc＝Fexht×K1×K2×K3＝Fext×K1′×K2′×K3′
Figure BDA0002973304880000103
Figure BDA0002973304880000104
Figure BDA0002973304880000105
Figure BDA0002973304880000106
And (3) obtaining:
Figure BDA0002973304880000111
acquiring the current environment temperature;
and searching the steam turbine exhaust flow corresponding to the second operating frequency and the condenser pressure corresponding to the current ambient temperature in a preset air-cooled condenser performance curve.
Optionally, calculating a second power generation corresponding to the second operating frequency according to the second pressure value includes:
calculating the variable quantity of the generating power of the air-cooled condenser at the first operating frequency and the second operating frequency according to a preset generating power variable quantity calculation formula and the influence coefficient of the steam turbine exhaust pressure on the unit power, wherein the generating power variable quantity calculation formula is as follows:
ΔPg＝Kp×(pc′-pc)
wherein, Δ PgRepresents the variation of the power generation of the air-cooled condenser at the first and second operating frequencies, pcThe pressure value p of the air-cooled condenser corresponding to the first operating frequency is shownc' represents the pressure value of the air-cooling condenser corresponding to the second operating frequency;
and calculating second generating power corresponding to the second operating frequency according to a preset second generating power calculation formula and the variation of the group generating power of the air-cooled condenser at the first operating frequency and the second operating frequency, wherein the second generating power calculation formula is as follows:
Pg′＝Pg+ΔPg
wherein, Pg' denotes a second power generation power corresponding to the second operation frequency.
Optionally, calculating the second net power of the cold-end system according to the second total power consumption of the cooling fan and the second generated power includes:
and calculating second net power of the cold end system according to a preset second net power calculation formula, wherein the second net power calculation formula is as follows:
P′net＝P′g-PL′
wherein, P'netRepresenting the second net power of the cold side system.
Optionally, calculating an influence coefficient of the steam turbine exhaust pressure on the unit power includes:
determining the influence coefficient of the steam turbine exhaust pressure on the unit power according to a preset exhaust pressure influence coefficient calculation formula and a preset unit power-steam turbine exhaust pressure curve, wherein the exhaust pressure influence coefficient calculation formula is as follows:
Figure BDA0002973304880000121
wherein, Pg1、Pg2Respectively, is the corresponding p on the performance curves1、ps2Unit power under exhaust pressure, unit kW; p is a radical ofs1、ps2The exhaust steam pressures of the two turbines on the performance curve are respectively in unit of kPa.
In the present embodiment, p is selected in calculating Kps1To ps2The exhaust pressure interval should include an air-cooled condenser pcTo pc' pressure interval.
According to the method, the first operating frequency of the cooling fan of the air-cooled condenser and the first net power of the cold end system corresponding to the first operating frequency are obtained; then, carrying out frequency adjustment of a preset variable quantity on the first operating frequency to obtain a second operating frequency, wherein the first operating frequency and the second operating frequency are both in a preset frequency range; then, calculating second net power of the cold end system corresponding to the second operating frequency; finally, when the second net power of the sub-cooling end system is not more than the first net power of the cold end system, the first operation frequency is used as the current optimal operation frequency; or when the second net power of the cold end system is greater than the first net power of the cold end system, the first operating frequency is made equal to the second operating frequency, and the step of carrying out frequency adjustment of preset variable quantity on the first operating frequency to obtain the second operating frequency is skipped. According to the method, the second operation frequency and the corresponding second net power are calculated through the first operation frequency and the preset variable quantity, and then the first net power and the second net power are compared, so that the operation frequency of the cooling fan enabling the net power of the cold end system to be the maximum can be determined.
According to the invention, the frequency and the actually measured power parameters of each cooling fan of the on-site air-cooled condenser are adopted, and through specific evaluation steps and an analytical calculation method, the influence of the frequency of the cooling fan deviating from a rated value on the performance of the air-cooled condenser can be determined and evaluated without a field test, so that quantitative data is provided for the operation energy-saving evaluation of a power plant; the method for evaluating the performance of the air-cooled condenser by the field cooling fan frequency can be used for quantitatively analyzing and evaluating the running condition of the cooling fan frequency deviating from the rated frequency, and is convenient to implement on site.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 2 is a schematic structural diagram of an optimal operating frequency determining apparatus for a cooling fan of an air-cooled condenser according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are shown, and details are as follows:
as shown in fig. 2, the device for determining the optimal operating frequency of the cooling fan of the air-cooled condenser includes:
the acquiring module 21 is configured to acquire a first operating frequency of a cooling fan of the air-cooled condenser and a first net power of a cold end system corresponding to the first operating frequency;
the frequency adjusting module 22 is configured to perform frequency adjustment of a preset variation on the first operating frequency to obtain a second operating frequency, where the first operating frequency and the second operating frequency are both within a preset frequency range;
the power calculation module 23 is configured to calculate a second net power of the cold-end system corresponding to the second operating frequency;
a comparison module 24, configured to take the first operating frequency as a current optimal operating frequency when the second net power of the cold-end system is not greater than the first net power of the cold-end system,
or when the second net power of the cold end system is greater than the first net power of the cold end system, the first operating frequency is made equal to the second operating frequency, and the step of carrying out frequency adjustment of preset variable quantity on the first operating frequency to obtain the second operating frequency is skipped.
Optionally, the power calculating module includes:
the total power consumption calculation unit is used for calculating second total power consumption of the cooling fan corresponding to the second operating frequency according to the first total power consumption of the cooling fan corresponding to the first operating frequency;
the pressure value calculating unit is used for calculating a second pressure value of the air-cooled condenser corresponding to the second operating frequency;
the generating power calculating unit is used for calculating second generating power corresponding to the second operating frequency according to a second pressure value of the air-cooling condenser;
and the net power calculating unit is used for calculating second net power of the cold end system according to the second total consumed power of the cooling fan and the second generated power.
Optionally, the total consumed power calculating unit is further configured to:
calculating second total power consumption of the cooling fan according to a preset second total power consumption formula of the cooling fan, wherein the second total power consumption formula of the cooling fan is as follows:
Figure BDA0002973304880000141
wherein, PL'represents a second total power consumption of the cooling fan, f' represents a second operating frequency, PLIndicating first total cooling fanThe power consumption n represents a characteristic index of the air-cooled condenser.
Optionally, the pressure value calculating unit is further configured to:
calculating the characteristic coefficient according to a preset characteristic coefficient formula, wherein the characteristic coefficient formula is as follows:
Figure BDA0002973304880000142
wherein, NTUGThe number of the heat exchange units of the air-cooled condenser under the rated working condition is represented;
calculating the performance influence coefficient of the fan power consumption corresponding to the first operating frequency on the air-cooled condenser according to a preset first influence coefficient formula, wherein the first influence coefficient formula is as follows:
Figure BDA0002973304880000143
wherein, K2A coefficient of influence f of the fan power consumption corresponding to the first operating frequency on the performance of the air-cooled condenserGRepresenting the operating frequency of the design working condition;
calculating the performance influence coefficient of the fan power consumption corresponding to the second operating frequency on the air-cooled condenser according to a preset second influence coefficient formula, wherein the second influence coefficient formula is as follows:
Figure BDA0002973304880000144
wherein, K'2Representing the performance influence coefficient of the fan power consumption corresponding to the second operating frequency on the air-cooled condenser;
and calculating the steam turbine exhaust flow corresponding to the second operating frequency according to a preset exhaust flow calculation formula in the design performance state, wherein the exhaust flow calculation formula is as follows:
Figure BDA0002973304880000145
wherein, F'exhIndicating the steam turbine discharge flow corresponding to the second operating frequency, FexhRepresenting the steam turbine exhaust flow corresponding to the first operating frequency;
acquiring the current environment temperature;
and searching the steam turbine exhaust flow corresponding to the second operating frequency and the condenser pressure corresponding to the current ambient temperature in a preset air-cooled condenser performance curve.
Optionally, the generated power calculating unit is further configured to:
calculating the variable quantity of the generating power of the air-cooled condenser at the first operating frequency and the second operating frequency according to a preset generating power variable quantity calculation formula and the influence coefficient of the steam turbine exhaust pressure on the unit power, wherein the generating power variable quantity calculation formula is as follows:
ΔPg＝Kp×(pc′-pc)
wherein, Δ PgRepresents the variation of the power generation of the air-cooled condenser at the first and second operating frequencies, pcThe pressure value p of the air-cooled condenser corresponding to the first operating frequency is shownc' represents the pressure value of the air-cooling condenser corresponding to the second operating frequency;
and calculating second generating power corresponding to the second operating frequency according to a preset second generating power calculation formula and the variation of the group generating power of the air-cooled condenser at the first operating frequency and the second operating frequency, wherein the second generating power calculation formula is as follows:
Pg′＝Pg+ΔPg
wherein, Pg' denotes a second power generation power corresponding to the second operation frequency.
Optionally, the net power calculating unit is further configured to:
and calculating second net power of the cold end system according to a preset second net power calculation formula, wherein the second net power calculation formula is as follows:
P′net＝P′g-PL′
wherein，P′netRepresenting the second net power of the cold side system.
Optionally, the generated power calculating unit is further configured to:
determining the influence coefficient of the steam turbine exhaust pressure on the unit power according to a preset exhaust pressure influence coefficient calculation formula and a preset unit power-steam turbine exhaust pressure curve, wherein the exhaust pressure influence coefficient calculation formula is as follows:
Figure BDA0002973304880000161
wherein, Pg1、Pg2Respectively, is the corresponding p on the performance curves1、ps2Unit power under exhaust pressure; p is a radical ofs1、ps2Respectively, the exhaust pressures of two turbines on the performance curve, and ps1To ps2Including p between the exhaust pressure zonescTo pc' pressure interval.
Fig. 3 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in fig. 3, the terminal 3 of this embodiment includes: a processor 30, a memory 31 and a computer program 32 stored in said memory 31 and executable on said processor 30. The processor 30, when executing the computer program 32, implements the steps in the above-described method for determining the optimal operating frequency of each air-cooled condenser cooling fan, for example, steps 101 to 105 shown in fig. 1. Alternatively, the processor 30, when executing the computer program 32, implements the functions of the modules/units in the above-mentioned device embodiments, such as the functions of the modules 31 to 34 shown in fig. 2.
Illustratively, the computer program 32 may be partitioned into one or more modules/units that are stored in the memory 31 and executed by the processor 30 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 32 in the terminal 3.
The terminal 3 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal may include, but is not limited to, a processor 30, a memory 31. It will be appreciated by those skilled in the art that fig. 3 is only an example of a terminal 3 and does not constitute a limitation of the terminal 3 and may comprise more or less components than those shown, or some components may be combined, or different components, e.g. the terminal may further comprise input output devices, network access devices, buses, etc.
The Processor 30 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 31 may be an internal storage unit of the terminal 3, such as a hard disk or a memory of the terminal 3. The memory 31 may also be an external storage device of the terminal 3, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) and the like provided on the terminal 3. Further, the memory 31 may also include both an internal storage unit and an external storage device of the terminal 3. The memory 31 is used for storing the computer program and other programs and data required by the terminal. The memory 31 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. The method for determining the optimal operating frequency of the cooling fan of the air-cooled condenser is characterized by comprising the following steps of:
acquiring a first operating frequency of a cooling fan of the air-cooled condenser and a first net power of a cold end system corresponding to the first operating frequency;
performing frequency adjustment of a preset variation on the first operating frequency to obtain a second operating frequency, wherein the first operating frequency and the second operating frequency are both within a preset frequency range;
calculating a second net power of the cold end system corresponding to the second operating frequency;
if the second net power of the cold end system is not larger than the first net power of the cold end system, taking the first operation frequency as the current optimal operation frequency;
and if the second net power of the cold end system is greater than the first net power of the cold end system, enabling the first operating frequency to be equal to the second operating frequency, and skipping to the step of carrying out frequency adjustment of preset variable quantity on the first operating frequency to obtain the second operating frequency.
2. The method for determining the optimal operating frequency of the air-cooled condenser cooling fan according to claim 1, wherein the calculating the second net power of the cold end system corresponding to the second operating frequency comprises:
calculating second total power consumption of the cooling fan corresponding to the second operating frequency according to the first total power consumption of the cooling fan corresponding to the first operating frequency;
calculating a second pressure value of the air-cooled condenser corresponding to the second operating frequency;
calculating second power generation power corresponding to the second operating frequency according to a second pressure value of the air-cooled condenser;
and calculating second net power of the cold end system according to the second total consumed power of the cooling fan and the second generated power.
3. The method for determining the optimal operating frequency of the cooling fan of the air-cooling condenser according to claim 2, wherein the calculating of the second total power consumption of the cooling fan corresponding to the second operating frequency comprises:
calculating the second total power consumption of the cooling fan according to a preset second total power consumption formula of the cooling fan, wherein the second total power consumption formula of the cooling fan is as follows:
Figure FDA0002973304870000021
wherein, PL'represents a second total power consumption of the cooling fan, f' represents a second operating frequency, PLThe first total power consumption of the cooling fan is shown, and n is a characteristic index of the air-cooled condenser.
4. The method for determining the optimal operating frequency of the air-cooled condenser cooling fan according to claim 3, wherein the calculating a second pressure value corresponding to the second operating frequency comprises:
calculating the characteristic coefficient of the air-cooled condenser according to a preset characteristic coefficient formula, wherein the characteristic coefficient formula is as follows:
Figure FDA0002973304870000022
wherein Γ represents a characteristic coefficient of the air-cooled condenser; NTUGThe number of the heat exchange units of the air-cooled condenser under the rated working condition is represented;
calculating the performance influence coefficient of the fan power consumption corresponding to the first operating frequency on the air-cooled condenser according to a preset first influence coefficient formula, wherein the first influence coefficient formula is as follows:
Figure FDA0002973304870000023
wherein, K2A coefficient of influence f of the fan power consumption corresponding to the first operating frequency on the performance of the air-cooled condenserGRepresenting the operating frequency of the design working condition;
calculating the performance influence coefficient of the fan power consumption corresponding to the second operating frequency on the air-cooled condenser according to a preset second influence coefficient formula, wherein the second influence coefficient formula is as follows:
Figure FDA0002973304870000024
wherein, K'2Representing the performance influence coefficient of the fan power consumption corresponding to the second operating frequency on the air-cooled condenser;
calculating the steam turbine exhaust flow corresponding to the second operating frequency according to a preset exhaust flow calculation formula in the design performance state, wherein the exhaust flow calculation formula is as follows:
Figure FDA0002973304870000025
wherein, F'exhIndicating the steam turbine discharge flow corresponding to the second operating frequency, FexhRepresenting the steam turbine exhaust flow corresponding to the first operating frequency;
acquiring the current environment temperature;
and searching the steam turbine exhaust flow corresponding to the second operating frequency and the condenser pressure corresponding to the current ambient temperature in a preset air-cooled condenser performance curve.
5. The method for determining the optimal operating frequency of the air-cooling condenser cooling fan according to any one of claims 2 to 4, wherein the calculating the second power generation corresponding to the second operating frequency according to the second pressure value comprises:
calculating the variation of the unit generating power of the air-cooled condenser at the first operating frequency and the second operating frequency according to a preset generating power variation calculation formula and an influence coefficient of the turbine exhaust pressure on the unit power, wherein the generating power variation calculation formula is as follows:
ΔPg＝Kp×(pc′-pc)
wherein, Δ PgRepresents the variation of the power generation capacity of the air-cooled condenser at the first and second operating frequencies, pcThe pressure value p of the air-cooled condenser corresponding to the first operating frequency is shownc' represents the pressure value of the air-cooling condenser corresponding to the second operating frequency;
calculating second generating power corresponding to the second operating frequency according to a preset second generating power calculation formula and the variation of the group generating power of the air-cooled condenser at the first operating frequency and the second operating frequency, wherein the second generating power calculation formula is as follows:
Pg′＝Pg+ΔPg
wherein, Pg' denotes a second generated power corresponding to the second operating frequency.
6. The method of determining an optimal operating frequency of an air-cooled condenser cooling fan of claim 5, wherein calculating the second net power of the cold end system based on the second total power consumed by the cooling fan and the second generated power comprises:
calculating a second net power of the cold end system according to a preset second net power calculation formula, wherein the second net power calculation formula is as follows:
P′net＝Pg′-PL′
wherein, P'netRepresenting the second net power of the cold side system.
7. The method of determining the optimal operating frequency of the air-cooled condenser cooling fan of claim 6, wherein calculating the coefficient of influence of the turbine discharge pressure on the power of the unit comprises:
determining an influence coefficient of the steam turbine exhaust pressure on the unit power according to a preset exhaust pressure influence coefficient calculation formula and a preset unit power-steam turbine exhaust pressure curve, wherein the exhaust pressure influence coefficient calculation formula is as follows:
Figure FDA0002973304870000041
wherein, Pg1、Pg2Respectively, is the corresponding p on the performance curves1、ps2Unit power under exhaust pressure; p is a radical ofs1、ps2Respectively, the exhaust pressures of two turbines on the performance curve, and ps1To ps2Including p between the exhaust pressure zonescTo pc' pressure interval.
8. The utility model provides an optimal operating frequency of air cooling condenser cooling blower confirms device which characterized in that includes:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first operating frequency of a cooling fan of the air-cooled condenser and a first net power corresponding to the first operating frequency;
the frequency adjusting module is used for performing frequency adjustment of a preset variable quantity on the first operating frequency to obtain a second operating frequency, wherein the first operating frequency and the second operating frequency are both in a preset frequency range;
the power calculation module is used for calculating second net power corresponding to the second operating frequency;
a comparison module for taking the first operating frequency as a current optimum operating frequency when the second net power is not greater than the first net power,
or when the second net power is greater than the first net power, making the first operating frequency equal to the second operating frequency, and skipping to the step of performing frequency adjustment of a preset variable quantity on the first operating frequency to obtain the second operating frequency.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and operable on the processor, wherein the processor when executing the computer program implements the steps of the method for determining an optimal operating frequency of an air-cooled condenser cooling fan according to any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the method for determining an optimal operating frequency of a cooling fan of an air-cooled condenser according to any one of claims 1 to 7.
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