CN107559212A - A kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method and system - Google Patents
A kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method and system Download PDFInfo
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Abstract
The present invention discloses a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method, refers specifically to：After obtaining the respective pump characteristics model of two constant speed water circulating pumps and pepeline characteristic model and the generated output of fired power generating unit, whether two respective circulations of constant speed water circulating pump of real-time judge are currently in steady state operating condition, when being in stable state, the respective current lift of two water circulating pumps and circulating water flow are calculated according to the pump characteristics model and pepeline characteristic model.The current constant speed recirculated water pump group efficiency of pump is calculated according to the power of motor of two constant speed water circulating pumps, current pump lift and previous cycle water-carrying capacity.The above method, for the situation of two constant speed recirculated water pump group pumps, establish the real-time judge mechanism of two water pump operation operating modes, solve prior art in monitoring process caused by cannot distinguish between systematic steady state and non-steady state state under unsteady state condition the calculating group efficiency of pump, the problem of accuracy rate is poor.
Description
Technical field
The present invention relates to the technical field of thermal power unit operation performance on-line monitoring, and in particular to a kind of fired power generating unit constant speed
Recirculated water pump group efficiency of pump on-line monitoring method and system.
Background technology
Water circulating pump is the visual plant of fired power generating unit cold end system, the subsidiary engine larger as power consumption in thermal power plant it
One, the electric energy of water circulating pump consumption accounts for the 1%~1.5% of factory's gross generation, and therefore, the operational efficiency of water circulating pump is entered
Row is accurately monitored on-line to fired power generating unit economical operation important in inhibiting.
Circulating Water Pump Efficiency on-line monitoring needs accurate calculating water circulating pump flow and lift.And water circulating pump is imitated
Rate evaluation must be based on steady state condition, when circulation is in variable working condition condition, the power of motor of water circulating pump, flow,
The parameters such as lift are in change procedure, and the Circulating Water Pump Efficiency now calculated has larger error with actual value, it is impossible to
Accurately reflect level of efficiency.Secondly as circulating water flow is big flow parameter, for example, being circulated in 600MW fired power generating units
Water designs total flow up to nearly 70000t/h, and the measurement cost of the circulating water flow of live direct measurement acquisition is higher, measurement essence
Degree is also difficult to be guaranteed.The A of Chinese invention patent CN 104863841 propose circulating water pump in thermal power plant efficiency on-line monitoring
Method, this method import and export flow velocity, further calculate pump lift by directly gathering water circulating pump flow, calculating water circulating pump,
Preceding to have addressed, this method is had a great influence by flow measurement precision, it is difficult to ensures the accuracy of result of calculation.
Water circulating pump is divided into two kinds of constant speed pump and speed-variable pump, and fired power generating unit typically configures two water circulating pumps, thus deposited
Combining, i.e. one two constant speed pumps, two speed-variable pumps or a constant speed pump speed-variable pump, the computational methods that different pump groups are closed are not
Equally, the present invention solves the existing constant speed recirculated water pump group efficiency of pump and calculated accurately only for the situation of two constant speed pump group pumps
The problem of rate is relatively low.
The content of the invention
The invention provides a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method and system, to improve
The constant speed recirculated water pump group efficiency of pump calculates accuracy rate.
The invention provides a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method, including：
Obtain the respective pump characteristics model of two constant speed water circulating pumps and pepeline characteristic model；
Obtain the generated output of fired power generating unit；
Whether two respective circulations of constant speed water circulating pump are currently in steady-state operation work described in real-time judge
Condition, when being in steady state operating condition, then two water circulating pumps are calculated according to the pump characteristics model and pepeline characteristic model
Respective current lift and circulating water flow；Otherwise, calculating process is terminated；
Calculated according to the power of motor, current pump lift and previous cycle water-carrying capacity of two constant speed water circulating pumps current
The constant speed recirculated water pump group efficiency of pump.
Preferably, it is described to judge circulation in above-mentioned fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method
Whether water system currently specifically refers in steady state operating condition,
Obtain the respective power of motor of two constant speed water circulating pumps and rotating speed；
According to formula (1) and be formula (2) calculate respectively unit generated output, the two constant speed circulation-water pump electric machine power and
The variance s of the respective filter value of two constant speed water circulating pumps rotating speed：
In formula：N is the sample number of sliding window；M is filtering series；xiFor the original value of the service data at i-th of moment；xi′
For the filter value of the service data at i-th of moment；For the arithmetic mean of instantaneous value of service data filter value, wherein service data is
Refer to unit generation power, the two constant speed circulation-water pump electric machine power and two constant speed water circulating pump rotating speed；
If unit generation power, the two constant speed circulation-water pump electric machine power and two constant speed water circulating pump turn
The variance of fast filter value is respectively less than or equal to threshold θ, then circulation is currently at the value of lower state, wherein threshold θ
Scope is 0.5~3.0.
Preferably, in above-mentioned fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method, described in the basis
Pump characteristics model and pepeline characteristic model calculate the respective lift of two water circulating pumps and circulating water flow specifically refers to：
Obtain the model of two constant speed water circulating pumps；
Obtain the parameter of curve in the respective pump characteristics model of two constant speed water circulating pumps and pepeline characteristic model；
Acquisition Hs is hydrostatic head,
When two constant speed water circulating pump models are identical, respective flow Q is calculated using formula (3)-(6)1、Q2And lift H
Computational methods be：
Hz=Hs+rQ2 (3)
H=a1+a2Q/2+a3Q2/4 (4)
H=Hz (5)
Q1=Q2=Q/2 (6)
When two constant speed water circulating pump model differences, calculate respective water circulating pump flow using formula (7)-(11) and raise
The computational methods of journey are：
Hz=Hs+rQ2 (7)
H1=a1,1+a1,2Q1+a1,3Q1 2 (8)
H2=a2,1+a2,2Q2+a2,3Q2 2 (9)
Hz=H1=H2) (10)
Q=Q1+Q2 (11)
Formula (3) is arrived in formula (11), and Hz is drag overall pressure head, and Hs is hydrostatic head, H1、H2The lift of respectively every pump, Q are
Pipeline total flow, Q1、Q2For the circulating water flow of every pump, r, a1、a2、a3、a1,1、a1.2、a1.3、a2,1、a2,2、a2.3For the spy of pump
Linearity curve and characteristic curve of pipeline model coefficient,
Preferably, in above-mentioned fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method, described in the basis
Respective power of motor, lift and the circulating water flow of two constant speed water circulating pumps calculate constant speed recirculated water pump group efficiency of pump tool
Body refers to：
Formula (12)-(13), η1、η2The efficiency of respectively every constant speed water circulating pump, H1、H2Respectively every water circulating pump
Lift, Q1、Q2The flow of respectively every water circulating pump, Pgr1、Pgr2The power of motor of respectively every water circulating pump, ηgr1、
ηgr2The electric efficiency of respectively every water circulating pump, ρ are the density of recirculated water, and g is acceleration of gravity, ηmImitated for machine driving
Rate.
Preferably, in above-mentioned fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method, the characteristic of the pump
Curve and characteristic curve of pipeline model coefficient r, a1、a2、a3、a1,1、a1.2、a1.3、a2,1、a2,2、a2.3It is by system design description
Book or fitting experimental data obtain.
Preferably, in above-mentioned fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method, M, N value are with adopting
Collect the unit generation power, the two constant speed circulation-water pump electric machine power and two constant speed water circulating pump rotating speed
Frequency t is related, and t span is 1-5s.
Second aspect, the invention provides a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring system, bag
Include：
First data acquisition module：For obtaining the respective pump characteristics model of two constant speed water circulating pumps and pepeline characteristic mould
Type；
Second data acquisition module：For obtaining the generated output of fired power generating unit；
System conditions judge module：For judging that the respective circulation of two constant speed water circulating pumps is current
Whether steady state operating condition is in；
Constant speed water circulating pump property calculation module：For working as when the respective circulation of two constant speed water circulating pumps
Before when being in steady state operating condition, calculate the respective lift of two water circulating pumps and circulating water flow；
Constant speed recirculated water pump group efficiency of pump computing module：For the power of motor according to two constant speed water circulating pumps,
Pump lift and circulating water flow calculate the constant speed recirculated water pump group efficiency of pump.
Method provided by the invention, for the situation of two constant speed recirculated water pump group pumps, establish two water pump operation works
The real-time judge mechanism of condition, when two water pumps are steady state condition, just will calculate current steady state when inscribe respective lift and
Circulating water flow, and just using the presteady state when inscribe respective lift and circulating water flow and calculate current two constant speed
The recirculated water pump group efficiency of pump.That is, method provided by the invention can screen non-steady state state, solves existing skill
Art is in monitoring process being calculated caused by cannot distinguish between systematic steady state and non-steady state state under unsteady state condition
The group efficiency of pump, the problem of accuracy rate is poor.Moreover, the parameter required in above-mentioned judgement and calculating can be from DCS control systems
Or directly read in power plant's SIS systems, scene need not additionally increase the expensive auxiliary equipment such as analysis or measuring instrumentss, into
This is relatively low.It is horizontal that the performance driving economy of water circulating pump can be accurately grasped using method provided by the invention, and can be with
On this basis, any energy saving optimizing measure done to circulation carries out effective evaluation.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, letter will be made to the required accompanying drawing used in embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is that a kind of flow of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method provided by the invention is shown
It is intended to；
A kind of Fig. 2 structural representations of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring system provided by the invention
Figure.
Embodiment
The present invention provides a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method and system, fixed to improve
The fast recirculated water pump group efficiency of pump calculates accuracy rate.
The invention provides a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method, for two constant speed
The situation of recirculated water pump group pump, refer to Fig. 1, and the figure shows the flow of this method, step are as follows：
In step sl, the respective pump characteristics model of two constant speed water circulating pumps and pepeline characteristic model are obtained.By
Systems design specification or fitting experimental data obtain the characteristic curve and characteristic curve of pipeline model coefficient of the pump.
In step s 2, the generated output of fired power generating unit is obtained.Acquisition modes can be DCS control systems or power plant SIS
Directly read in system.Scene need not additionally increase the expensive auxiliary equipment such as analysis or measuring instrumentss, and cost is relatively low.
In step s3, whether two respective circulations of constant speed water circulating pump are currently in described in real-time judge
Steady state operating condition, it is when being in steady state operating condition, then in step s 5, special according to the pump characteristics model and pipeline
Property model calculate the respective current lift of two water circulating pumps and circulating water flow；Otherwise, in step s 4, terminate to calculate
Journey.It can be seen that invention introduces the judgement to two constant speed water circulating pump real time execution operating modes, only two are in stable state
During operation, ability gathered data,
Finally, in step s 6, follow according to the power of motor of two constant speed water circulating pumps, current pump lift and currently
Ring water-carrying capacity calculates the current constant speed recirculated water pump group efficiency of pump.Using the data under stable state, ensure that will not be because of collecting
There is error in data, and cause to use the accuracy of the current group of efficiency of pump obtained after these data poor with respective actual value.
Instant invention overcomes in existing method, the energy-conservation of fired power generating unit is instructed with the group efficiency of pump under unsteady drying is foundation
The problem of optimizing and existing.The performance driving economy of water circulating pump can be accurately grasped using method provided by the invention
Level, energy saving optimizing measure progress effective evaluation is done to circulation for foundation with secondary.
For in step S3, judging whether circulation is currently specifically referred to according to following step in steady state operating condition
It is rapid to carry out：
First, the respective power of motor of two constant speed water circulating pumps and rotating speed are obtained.Acquisition modes can be that DCS is controlled
Directly read in system processed or power plant's SIS systems.
Secondly, according to formula (1) and it is that formula (2) calculates unit generated output, two constant speed circulation-water pump electric machine power respectively
With the variance s of the respective filter value of two constant speed water circulating pumps rotating speed：
In formula：N is the sample number of sliding window；M is filtering series；xiFor the original value of the service data at i-th of moment；xi′
For the filter value of the service data at i-th of moment；For the arithmetic mean of instantaneous value of service data filter value, wherein service data is
Refer to unit generation power, the two constant speed circulation-water pump electric machine power and two constant speed water circulating pump rotating speed.
If unit generation power, the two constant speed circulation-water pump electric machine power and two constant speed water circulating pump turn
The variance of fast filter value is respectively less than or equal to threshold θ, then circulation is currently at the value of lower state, wherein threshold θ
Scope is 0.5~3.0.M, N is constant, its value and collection unit generated output, two constant speed circulation-water pump electric machine power and
The frequency t of two constant speed water circulating pump rotating speeds is related, and t span is 1-5s.T value is smaller, organizes the accurate of the efficiency of pump
Degree is higher.1-5s frequency acquisition meets national standard, and the obtained group efficiency of pump is accurate, and those skilled in the art can be
Decide the height of frequency acquisition in the range of this in its sole discretion, the present invention is without limitation.
For in step S5, being calculated according to the pump characteristics model and pepeline characteristic model, two water circulating pumps are respective to be raised
Journey and circulating water flow specifically refer to：
First, the model of two constant speed water circulating pumps is obtained.The model of pump can obtain according to equipment specification.
Secondly, the curve ginseng in the respective pump characteristics model of two constant speed water circulating pumps and pepeline characteristic model is obtained
R, a in number, in particular to following formula1、a2、a3、a1,1、a1.2、a1.3、a2,1、a2,2、a2.3It is by systems design specification or experiment
Data fitting obtains.
Again, it is hydrostatic head to obtain Hs by field test.
When two constant speed water circulating pump models are identical, respective flow Q is calculated using formula (3)-(6)1、Q2And lift H
Computational methods be：
Hz=Hs+rQ2 (3)
H=a1+a2Q/2+a3Q2/4 (4)
H=Hz (5)
Q1=Q2=Q/2 (6)
When two constant speed water circulating pump model differences, calculate respective water circulating pump flow using formula (7)-(11) and raise
The computational methods of journey are：
Hz=Hs+rQ2 (7)
H1=a1,1+a1,2Q1+a1,3Q1 2 (8)
H2=a2,1+a2,2Q2+a2,3Q2 2 (9)
Hz=H1=H2) (10)
Q=Q1+Q2 (11)
Formula (3) is arrived in formula (11), and Hz is drag overall pressure head, and Hs is hydrostatic head, H1、H2The lift of respectively every pump, Q are
Pipeline total flow, Q1、Q2For the circulating water flow of every pump, r, a1、a2、a3、a1,1、a1.2、a1.3、a2,1、a2,2、a2.3For the spy of pump
Linearity curve and characteristic curve of pipeline model coefficient.
It can be seen that in above formula (3)-(11), it is known that parameter is：Hs、r、a1、a2、a3、a1,1、a1.2、a1.3、a2,1、 a2,2、
a2.3, unknown parameter Hz, H1、H2、Q1、Q2, i.e. five equations, five unknown numbers can be each in the hope of two constant speed water circulating pumps
From current lift and flow.
In step s 6, according to respective power of motor, lift and the circulating water flow of two constant speed water circulating pumps
The constant speed recirculated water pump group efficiency of pump is calculated to specifically refer to carry out according to the following formula：
Formula (12)-(13), η1、η2The efficiency of respectively every constant speed water circulating pump, H1、H2Respectively every water circulating pump
Lift, Q1、Q2The flow of respectively every water circulating pump, Pgr1、Pgr2The power of motor of respectively every water circulating pump, ηgr1、
ηgr2The electric efficiency of respectively every water circulating pump, ρ are the density of recirculated water, and g is acceleration of gravity, ηmImitated for machine driving
Rate.Pgr1、Pgr2、ηgr1、ηgr2To be known.
Fig. 2 is refer to, the figure shows the fired power generating unit constant speed recirculated water pump group efficiency of pump provided by the invention on-line monitoring
The structural representation of system, include as shown in the figure as follows with lower module, concrete function.
First data acquisition module：For obtaining the respective pump characteristics model of two constant speed water circulating pumps and pepeline characteristic mould
Type；
Second data acquisition module：For obtaining the generated output of fired power generating unit and obtaining two constant speed water circulating pumps
Respective power of motor and rotating speed, obtained especially by OPC modes from DCS or SIS systems.The data of acquisition are located after filtering
System conditions judge module, constant speed water circulating pump property calculation module and constant speed recirculated water pump group efficiency of pump meter are supplied after reason
Module is calculated to use.
System conditions judge module：For judging that the respective circulation of two constant speed water circulating pumps is current
Whether steady state operating condition is in.System conditions judge module input data is unit generation power, each circulation
The filter value of pump motor power and rotating speed, export to calculate enable signal, when judging that circulation is in steady-state operation work
During condition, the calculating enable signal value of output is 1, and otherwise, the calculating enable signal value of output is 0.Specific decision logic please join
The related introduction content for stating fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method is admitted to, this is not repeated.
Constant speed water circulating pump property calculation module：For working as when the respective circulation of two constant speed water circulating pumps
Before when being in steady state operating condition, calculate the respective lift of two water circulating pumps and circulating water flow.Constant speed water circulating pump is special
Property computing module input include calculate enable signal, export as the flow and lift of every water circulating pump.Specifically calculated
Journey refer to the related introduction content of above-mentioned fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method, and this is not repeated.
Constant speed recirculated water pump group efficiency of pump computing module：For the power of motor according to two constant speed water circulating pumps,
Pump lift and circulating water flow calculate the constant speed recirculated water pump group efficiency of pump.Above-mentioned constant speed recirculated water pump group efficiency of pump computing module
Input include calculate enable signal, constant speed water circulating pump property calculation module calculate each water circulating pump flow, lift with
And the power of motor of every pump, export as the efficiency of every water circulating pump.Specific calculating process refer to above-mentioned fired power generating unit
The related introduction content of constant speed recirculated water pump group efficiency of pump on-line monitoring method, this is not repeated.
Described above is only the embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
- A kind of 1. fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method, it is characterised in that including：Obtain the respective pump characteristics model of two constant speed water circulating pumps and pepeline characteristic model；Obtain the generated output of fired power generating unit；Whether two respective circulations of constant speed water circulating pump are currently in steady state operating condition described in real-time judge, when When being in steady state operating condition, then it is respective two water circulating pumps to be calculated according to the pump characteristics model and pepeline characteristic model Current lift and circulating water flow；Otherwise, calculating process is terminated；Current constant speed is calculated according to the power of motor, current pump lift and previous cycle water-carrying capacity of two constant speed water circulating pumps The recirculated water pump group efficiency of pump.
- 2. a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method according to claim 1, its feature It is, it is described to judge whether circulation currently specifically refers in steady state operating condition：Obtain the respective power of motor of two constant speed water circulating pumps and rotating speed；According to formula (1) and it is that formula (2) calculates unit generated output, the two constant speed circulation-water pump electric machine power and described respectively The variance s of the respective filter value of two constant speed water circulating pump rotating speeds：<mrow> <mi>s</mi> <mo>=</mo> <mfrac> <mrow> <munderover> <mo>&Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msup> <mrow> <mo>(</mo> <msup> <msub> <mi>x</mi> <mi>i</mi> </msub> <mo>&prime;</mo> </msup> <mo>-</mo> <msup> <mover> <mi>x</mi> <mo>&OverBar;</mo> </mover> <mo>&prime;</mo> </msup> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> <mrow> <mi>N</mi> <mo>-</mo> <mn>1</mn> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow><mrow> <msup> <msub> <mi>x</mi> <mi>i</mi> </msub> <mo>&prime;</mo> </msup> <mo>=</mo> <mfrac> <mn>1</mn> <mi>M</mi> </mfrac> <mrow> <mo>(</mo> <msub> <mi>x</mi> <mi>i</mi> </msub> <mo>+</mo> <msub> <mi>x</mi> <mrow> <mi>i</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>x</mi> <mrow> <mi>i</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <mo>+</mo> <mn>...</mn> <msub> <mi>x</mi> <mrow> <mi>i</mi> <mo>-</mo> <mi>M</mi> <mo>+</mo> <mn>1</mn> </mrow> </msub> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>In formula：N is the sample number of sliding window；M is filtering series；xiFor the original value of the service data at i-th of moment；xi' for the The filter value of the service data at i moment；For the arithmetic mean of instantaneous value of service data filter value, wherein service data refers to unit Generated output, the two constant speed circulation-water pump electric machine power and two constant speed water circulating pump rotating speed；If unit generation power, the two constant speed circulation-water pump electric machine power and two constant speed water circulating pumps rotating speed filter The variance of wave number is respectively less than or equal to threshold θ, then circulation is currently at the span of lower state, wherein threshold θ For 0.5~3.0.
- 3. a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method according to claim 1, its feature It is, it is described that the respective lift of two water circulating pumps and circulating water flow are calculated according to the pump characteristics model and pepeline characteristic model Amount specifically refers to：Obtain the model of two constant speed water circulating pumps；Obtain the parameter of curve in the respective pump characteristics model of two constant speed water circulating pumps and pepeline characteristic model；Acquisition Hs is hydrostatic head；When two constant speed water circulating pump models are identical, respective flow Q is calculated using formula (3)-(6)1、Q2And lift H calculating Method is：Hz=Hs+rQ2 (3)H=a1+a2Q/2+a3Q2/4 (4)H=Hz (5)Q1=Q2=Q/2 (6)When two constant speed water circulating pump model differences, respective water circulating pump flow and lift are calculated using formula (7)-(11) Computational methods are：Hz=Hs+rQ2 (7)H1=a1,1+a1,2Q1+a1,3Q1 2 (8)H2=a2,1+a2,2Q2+a2,3Q2 2 (9)Hz=H1=H2) (10)Q=Q1+Q2 (11)Formula (3) is arrived in formula (11), and Hz is drag overall pressure head, and Hs is hydrostatic head, H1、H2The lift of respectively every pump, Q are pipeline Total flow, Q1、Q2For the circulating water flow of every pump, r, a1、a2、a3、a1,1、a1.2、a1.3、a2,1、a2,2、a2.3It is bent for the characteristic of pump Line and characteristic curve of pipeline model coefficient.
- 4. a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method according to claim 1, its feature It is, it is described to be followed according to the respective power of motor, lift and circulating water flow of two constant speed water circulating pumps calculating constant speed The ring water pump group efficiency of pump specifically refers to：<mrow> <msub> <mi>&eta;</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&rho;Q</mi> <mn>1</mn> </msub> <msub> <mi>gH</mi> <mn>1</mn> </msub> </mrow> <mrow> <mn>1000</mn> <mo>&times;</mo> <msub> <mi>P</mi> <mrow> <mi>g</mi> <mi>r</mi> <mn>1</mn> </mrow> </msub> <mo>&times;</mo> <msub> <mi>&eta;</mi> <mrow> <mi>g</mi> <mi>r</mi> <mn>1</mn> </mrow> </msub> <mo>&times;</mo> <msub> <mi>&eta;</mi> <mi>m</mi> </msub> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>12</mn> <mo>)</mo> </mrow> </mrow><mrow> <msub> <mi>&eta;</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&rho;Q</mi> <mn>2</mn> </msub> <msub> <mi>gH</mi> <mn>2</mn> </msub> </mrow> <mrow> <mn>1000</mn> <mo>&times;</mo> <msub> <mi>P</mi> <mrow> <mi>g</mi> <mi>r</mi> <mn>2</mn> </mrow> </msub> <mo>&times;</mo> <msub> <mi>&eta;</mi> <mrow> <mi>g</mi> <mi>r</mi> <mn>2</mn> </mrow> </msub> <mo>&times;</mo> <msub> <mi>&eta;</mi> <mi>m</mi> </msub> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>13</mn> <mo>)</mo> </mrow> </mrow>Formula (12)-(13), η1、η2The efficiency of respectively every constant speed water circulating pump, H1、H2Respectively every water circulating pump is raised Journey, Q1、Q2The flow of respectively every water circulating pump, Pgr1、Pgr2The power of motor of respectively every water circulating pump, ηgr1、ηgr2Point Not Wei every water circulating pump electric efficiency, ρ is the density of recirculated water, and g is acceleration of gravity, ηmFor machinery driving efficiency.
- 5. a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method according to claim 4, its feature It is, the characteristic curve and characteristic curve of pipeline model coefficient r, a of the pump1、a2、a3、a1,1、a1.2、a1.3、a2,1、a2,2、a2.3 It is by systems design specification or fitting experimental data acquisition.
- 6. a kind of fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring method according to claim 2, its feature Be, M, N value with gather the unit generation power, the two constant speed circulation-water pump electric machine power and it is described two it is fixed The frequency t of fast water circulating pump rotating speed is related, and t span is 1-5s.
- A kind of 7. fired power generating unit constant speed recirculated water pump group efficiency of pump on-line monitoring system, it is characterised in that including：First data acquisition module：For obtaining the respective pump characteristics model of two constant speed water circulating pumps and pepeline characteristic model；Second data acquisition module：For obtaining the generated output of fired power generating unit；System conditions judge module：For judge the respective circulation of two constant speed water circulating pumps it is current whether It is in steady state operating condition；Constant speed water circulating pump property calculation module：For when the respective circulation of two constant speed water circulating pumps it is currently equal During in steady state operating condition, the respective lift of two water circulating pumps and circulating water flow are calculated；Constant speed recirculated water pump group efficiency of pump computing module：For being raised according to power of motor, the pump of two constant speed water circulating pumps Journey and circulating water flow calculate the constant speed recirculated water pump group efficiency of pump.
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| CN112240287A (en) * | 2020-10-19 | 2021-01-19 | 西安热工研究院有限公司 | Online diagnosis system and method for circulating water pump of thermal power generating unit |
| CN114576149B (en) * | 2022-01-28 | 2023-11-28 | 华电电力科学研究院有限公司 | Optimal operation control system and method for circulating water pump of thermal power plant |
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