CN104361258B - Energy-saving effect detection method of the fluid-mechanic system gearshift adjustment with respect to valve regulated - Google Patents
Energy-saving effect detection method of the fluid-mechanic system gearshift adjustment with respect to valve regulated Download PDFInfo
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Abstract
The invention provides a kind of energy-saving effect detection method of fluid-mechanic system gearshift adjustment with respect to valve regulated, including gearshift adjustment energy resource consumption detection process, valve regulated energy resource consumption detection process and effect statistic processes；The present invention uses performance curve the Fitting Calculation method, operating point is determined for performance curve of the valve regulated according to equipment, for gearshift adjustment new operating point is determined according to system pipe network resistance curve, then according to valve regulated and gearshift adjustment, corresponding operating point finally gives the energy resource consumption value of operating mode respectively, the energy resource consumption value under the gearshift adjustment and the energy resource consumption value under valve regulated are respectively obtained after cumulative, both are subtracted each other, energy conservation value may finally be obtained.
Description
Technical field
The present invention relates to fluid-mechanic system, more particularly to a kind of fluid-mechanic system gearshift adjustment is with respect to valve regulated
Energy-saving effect detection method.
Background technology
During power when calculating fluid-mechanic system valve regulated, shaft power and electrical consumption work(are generally thought roughly
Rate is constant, is a substantially invariable value；It is with valve wide open shape during power when calculating fluid-mechanic system gearshift adjustment
On the basis of shaft power under state, calculated according to power during gearshift adjustment and rotating speed into cubic relationship.
Actual conditions are：For the fluid-mechanic system of valve regulated, when changing valve opening, its power is to exist to become
Change, especially in the larger system of changes in flow rate, amplitude of variation is more obvious.For the fluid machinery system of gearshift adjustment
System, due to then must be become on the basis of the shaft power under valve wide open state according to the similar law of fluid machinery to calculate
Power during velocity modulation section, but rule of thumb data are reversely pushed out for shaft power under valve wide open state, are not considered
It is larger to the difference of every kind of fluid machinery power-performance curve, error；Simultaneously because many factors are to system pipe network drag characteristic
Influence, power during gearshift adjustment not always followed by cube changing for rotating speed.Therefore calculate in this way
There is bigger deviation for the energy-saving effect and actual conditions come.
The content of the invention
The technical problem to be solved in the present invention is how more realistically to predict and the energy consumption condition of reaction system and energy-conservation feelings
Condition.
In order to solve this technical problem, the invention provides a kind of fluid-mechanic system gearshift adjustment with respect to valve regulated
Energy-saving effect detection method, including gearshift adjustment energy resource consumption detection process, valve regulated energy resource consumption detection process and
Effect statistic processes；
The valve regulated energy resource consumption detection process process includes：
S11：Obtained according to the performance table of used fluid machines some to flow and total head under specific rotation speeds
Respective value, respective value is fitted to some with quadratic function, obtains the performance curve of equipment；
S12：Change the open degree of valve according to the demand of an operating mode, record open degree down-off change and total head
The respective value of change；
S13：Repeat step S12, until completing all operating modes；
For each operating mode：
Respective value according to open degree down-off change and total head change establishes a resistance of ducting characteristic curve, takes step
The performance curve for the equipment that S11 is obtained is the operating point value of the operating mode with the characteristic intersection point of the resistance of ducting, and then obtains
The energy resource consumption value of the operating mode；
S14：The energy resource consumption value of different operating modes is added, obtains the energy resource consumption value under valve regulated；
The gearshift adjustment energy resource consumption detection process includes：
S21：Tested according to used fluid machines, obtain being fitted with quadratic function under specific open degree
Resistance of ducting characteristic curve；
S22：The rotating speed for changing fluid machines according to the demand of an operating mode is adjusted, and records the rotating speed and flows down
The respective value of amount change and total head change；
S23：Repeat step S21 and S22, until completing all operating modes；
For each operating mode：
Performance table according to fluid machines under the rotating speed obtains some to flow and the respective value of total head, and then obtains
The performance curve of one equipment, the characteristic intersection point of the resistance of ducting that the performance curve of the equipment and step S21 are obtained is taken to be somebody's turn to do
The operating point value of operating mode, and then obtain the energy resource consumption value of the operating mode；
S24：The energy resource consumption value of different operating modes is added, obtains the energy resource consumption value under gearshift adjustment；
After completing the gearshift adjustment energy resource consumption detection process and valve regulated energy resource consumption detection process, by the change
Energy resource consumption value under velocity modulation section is subtracted each other with the energy resource consumption value under valve regulated, obtains energy conservation value.
In the step S11, the functional expression of the quadratic function is：
Y=a2x2+a1x+a0
Wherein, y is variable, represents total head, and x is independent variable, represents flow, a0、a1、a2For coefficient to be determined.
The fluid machines use pump machinery.
In the step S21, when obtaining the resistance of ducting characteristic curve under specific open degree, some groups of data, generation are gathered
Enter in below equation：
H=KQ2+ΔP；
The relation of pipeline lift and flow is obtained, and then obtains resistance of ducting characteristic curve；Wherein, H is variable, represents to raise
Journey, K represent pipe characteristic coefficient, and Q is independent variable, represent flow, and Δ P represents static lift.
The fluid machines use Fan Devices.
In the step S21, when obtaining the resistance of ducting characteristic curve under specific open degree, some groups of data are gathered,
Substitute into below equation：
P=KQ2
The resistance of ducting and the relation of flow are obtained, and then obtains resistance of ducting characteristic curve；Wherein, P is variable, represents pipe
Road resistance, K represent pipe characteristic coefficient, and Q is independent variable, represent flow.
In the step S13 and S23, when obtaining the energy resource consumption value of the operating mode, first according to the operating point value institute
Corresponding total head and flow are worth to the corresponding power in the operating point, then obtain the efficiency of the power divided by fluid machines
To the performance number of actual consumption, the performance number is multiplied by the time for corresponding to operating mode, so as to obtain the energy resource consumption value of the operating mode.
The present invention uses performance curve the Fitting Calculation method, and work is determined for performance curve of the valve regulated according to equipment
Point, new operating point is determined according to system pipe network resistance curve for gearshift adjustment, then according to valve regulated and speed change
The energy resource consumption value that corresponding operating point respectively finally gives an operating mode is adjusted, is respectively obtained after cumulative under the gearshift adjustment
Energy resource consumption value and the energy resource consumption value under valve regulated, both are subtracted each other, may finally obtain energy conservation value.It is determined that should
In the case of saving value, according to the running of the saving value evaluation system, can go to be related to using the saving value unlatching of valve with
The regulation of speed, to reach the optimal operation scheme of energy-saving effect.
Brief description of the drawings
Fig. 1 is valve regulated performance chart in one embodiment of the invention；
Fig. 2 is gearshift adjustment performance chart in one embodiment of the invention.
Embodiment
Below with reference to Fig. 1 and Fig. 2 to section of the fluid-mechanic system gearshift adjustment provided by the invention with respect to valve regulated
Energy effect detection method is described in detail, and it is an optional embodiment of the invention, it is believed that those skilled in the art
Member can modify and polish to it in the range of spirit and content of the invention is not changed.
The invention provides a kind of energy-saving effect detection method of fluid-mechanic system gearshift adjustment with respect to valve regulated, bag
Include gearshift adjustment energy resource consumption detection process, valve regulated energy resource consumption detection process and effect statistic processes；
Fig. 1 is refer to, the valve regulated energy resource consumption detection process process includes：
S11：Obtained according to the performance table of used fluid machines some to flow and total head under specific rotation speeds
Respective value, respective value is fitted to some with quadratic function, obtains the performance curve of equipment；
In the step S11, the functional expression of the quadratic function is：
Y=a2x2+a1x+a0
Wherein, y is variable, represents total head, and x is independent variable, represents flow, a0、a1、a2For coefficient to be determined.
S12：Change the open degree of valve according to the demand of an operating mode, record open degree down-off change and total head
The respective value of change；
S13：Repeat step S12, until completing all operating modes；
For each operating mode：
Respective value according to open degree down-off change and total head change establishes a resistance of ducting characteristic curve, takes step
The performance curve for the equipment that S11 is obtained is the operating point value of the operating mode with the characteristic intersection point of the resistance of ducting, and then obtains
The energy resource consumption value of the operating mode；
S14：The energy resource consumption value of different operating modes is added, obtains the energy resource consumption value under valve regulated；
The detection of the consumption figures of the energy also can be described as when in other words, about valve regulated：
During using valve regulated flow, fluid machines are not controlled in itself, and system pipeline resistance curve changes, stream
The performance curve of body plant equipment in itself is basically unchanged, and operating point is moved along the performance curve of equipment in itself, therefore can basis
Flow after change searched on performance curve corresponding to new operating point, as shown in Figure 1.
The performance curve of equipment is first fitted according to given data, considers blower fan and the performance curve of pump class, typically
Fan performance table data have 3 points up to 7 points, pump performance table data, are fitted accordingly with quadratic function enough
Accurately, therefore only need from normal work when performance curve on take 3 point coordinates for fitting.
Remember that quadratic function formula to be fitted is：
Y=a2x2+a1x+a0(in formula：A2, a1, a0 are the coefficient of quadratic polynomial, and x- is variable, and this place is flow system flow
Value)
3 point coordinate datas on performance curve are sequentially input into above formula, Simultaneous Equations is solved, quadratic polynomial can be tried to achieve
Coefficient a2, a1, a0, complete equipment performance curve itself fitting solve.
Because solution Simultaneous Equations are comparatively laborious, common operating procedure is：Using Excel chart application software, draw
Go out the performance curve of equipment, using the function of " format trendline " in Excel, can conveniently try to achieve the multinomial side of performance curve
Journey.See Fig. 1.
Thus can according to the flow under various operating modes from performance curve according to performance curve equation, try to achieve corresponding
New operating point be total head value, then obtain pneumatic power corresponding to new operating point according to the areal calculation on flow-total head figure,
Again divided by the power that is just consumed of efficiency.Corresponding performance number P under various operating modes when can calculate change valve regulation successivelyVI,
And obtain and the run time t under corresponding operating modeiRespective product, most each value summation at last, it is possible to when drawing valve regulated
The energy resource consumption value of fluid-mechanic system:
Fig. 2 is refer to, the gearshift adjustment energy resource consumption detection process includes：
S21：Tested according to used fluid machines, obtain being fitted with quadratic function under specific open degree
Resistance of ducting characteristic curve；
In an optional embodiment of the invention, the fluid machines use pump machinery.
In the step S21, when obtaining the resistance of ducting characteristic curve under specific open degree, some groups of data, generation are gathered
Enter in below equation：
H=KQ2+ΔP；
The relation of pipeline lift and flow is obtained, and then obtains resistance of ducting characteristic curve；Wherein, H is variable, represents pipe
Road lift, K represent pipe characteristic coefficient, and Q is independent variable, represent flow, and Δ P represents static lift.
In an optional embodiment of the invention, the fluid machines use Fan Devices.
So in the step S21, when obtaining the resistance of ducting characteristic curve under specific open degree, some groups of numbers are gathered
According in substitution below equation：
P=KQ2
The resistance of ducting and the relation of flow are obtained, and then obtains resistance of ducting characteristic curve；Wherein, P is variable, represents pipe
Road resistance, K represent pipe characteristic coefficient, and Q is independent variable, represent flow.
S22：The rotating speed for changing fluid machines according to the demand of an operating mode is adjusted, and records the rotating speed and flows down
The respective value of amount change and total head change；
S23：Repeat step S21 and S22, until completing all operating modes；
For each operating mode：
Performance table according to fluid machines under the rotating speed obtains some to flow and the respective value of total head, and then obtains
The performance curve of one equipment, the characteristic intersection point of the resistance of ducting that the performance curve of the equipment and step S21 are obtained is taken to be somebody's turn to do
The operating point value of operating mode, and then obtain the energy resource consumption value of the operating mode；
S24：The energy resource consumption value of different operating modes is added, obtains the energy resource consumption value under gearshift adjustment；
The detection of the consumption figures of the energy also can be described as when in other words, about gearshift adjustment：
During using gearshift adjustment flow, resistance of ducting characteristic curve is constant, and the performance curve of fluid machines in itself changes
Become, operating point moves along resistance of ducting characteristic curve, therefore should be searched according to the flow after change on pipeline characteristic curve pair
The new operating point answered, as shown in Figure 2.
Resistance of ducting characteristic curve is first fitted according to given data.For thinking that the incompressible resistance of ducting of fluid is special
Property (water pump class), typically considers static lift, drag characteristic is designated as：
H=KQ2+ △ P (in formula, K is pipe characteristic coefficient, and △ P are static lift)
For the Fan Devices for conveying gas medium class, due to smaller, static pressure for gas density relative liquid
Power is ignored too late substantially, and drag characteristic is designated as：
P=KQ2(in formula, K is pipe characteristic coefficient), resistance of ducting characteristic and flow are into quadratic relationship.
So at most only needs to take 2 cans to draw resistance of ducting characteristic curve equation.
The function of " format trendline " in Excel can also be utilized, conveniently tries to achieve the characteristic equation of the resistance of ducting.
See Fig. 2.
Thus can according to the flow under various operating modes from resistance of ducting characteristic curve according to equation, try to achieve corresponding
New operating point be total head value, then obtain pneumatic power corresponding to new operating point according to the areal calculation on flow-total head figure,
Again divided by the power that is just consumed of efficiency.Corresponding performance number under various operating modes when can calculate gearshift adjustment successively
Pinvi, and obtain and the run time t under corresponding operating modeiRespective product, most each value summation at last, it is possible to draw change velocity modulation
The energy resource consumption value of fluid-mechanic system during section:
After completing the gearshift adjustment energy resource consumption detection process and valve regulated energy resource consumption detection process, by the change
Energy resource consumption value under velocity modulation section is subtracted each other with the energy resource consumption value under valve regulated, obtains energy conservation value.
Specifically, the energy source value that can obtain gearshift adjustment can save relative to valve regulated is：
Esave=EV-EINV(Kwh)
In the step S13 and S23, when obtaining the energy resource consumption value of the operating mode, first according to the operating point value institute
Corresponding total head and flow are worth to the corresponding power in the operating point, then obtain the efficiency of the power divided by fluid machines
To the performance number of actual consumption, the performance number is multiplied by the time for corresponding to operating mode, so as to obtain the energy resource consumption value of the operating mode.
It can be seen that beneficial effects of the present invention comprise at least：Traditional empirical estimation is instead of, can be intended in energy-saving effect
On the basis of total calculation, continue to realize the depth energy saving that can shift to an earlier date Accurate Prediction, solve Energy-saving Projects in accuracy and completeness
The problem of aspect is present.Compared with usually used energy-saving effect measuring method, fluid machine is obtained using the method for curve matching
The characteristic equation of performance curve and the resistance of ducting of tool device personality, is easy to write and is quickly accurately applied to engineering
The energy-saving effect computing module of project.
In summary, using performance curve the Fitting Calculation method, determined for performance curve of the valve regulated according to equipment
Operating point, new operating point is determined according to system pipe network resistance curve for gearshift adjustment, then according to valve regulated and
The gearshift adjustment rectangular area that corresponding operating point and origin determine respectively again divided by efficiency be calculated respectively valve regulated and
Power corresponding to gearshift adjustment.Both differences are energy-saving effect of the gearshift adjustment relative to valve regulated.It is determined that the saving
, can be according to the running of the saving value evaluation system in the case of value, unlatching and the speed for going to be related to valve using the saving value
Regulation, to reach the optimal operation scheme of energy-saving effect.
Claims (6)
1. a kind of fluid-mechanic system gearshift adjustment is with respect to the energy-saving effect detection method of valve regulated, including the gearshift adjustment energy
Consume detection process, valve regulated energy resource consumption detection process and effect statistic processes；
The valve regulated energy resource consumption detection process includes：
S11：Obtained according to the performance table of used fluid machines some corresponding with total head to flow under specific rotation speeds
Value, is fitted to respective value to some with quadratic function, obtains the performance curve of equipment；
S12：Change the open degree of valve according to the demand of an operating mode, record open degree down-off change and change with total head
Respective value；
S13：Repeat step S12, until completing all operating modes；
For each operating mode：
Respective value according to open degree down-off change and total head change establishes a resistance of ducting characteristic curve, takes step S11
The performance curve of obtained equipment and the operating point value that the characteristic intersection point of the resistance of ducting is the operating mode, according to the work
Operating point corresponding to point value and the rectangular area that origin determines obtain the corresponding power in the operating point, then by the power divided by
The efficiency of fluid machines obtains the performance number of actual consumption, and the performance number is multiplied by the time of corresponding operating mode, and then obtains
The energy resource consumption value of the operating mode；
S14：The energy resource consumption value of different operating modes is added, obtains the energy resource consumption value under valve regulated；
The gearshift adjustment energy resource consumption detection process includes：
S21：Tested according to used fluid machines, obtain the resistance of ducting characteristic curve under specific open degree；
S22：The rotating speed for changing fluid machines according to the demand of an operating mode is adjusted, and records the dirty quantitative change of the rotating speed
Change the respective value with total head change；
S23：Repeat step S21 and S22, until completing all operating modes；
For each operating mode：
Performance table according to fluid machines under the rotating speed obtains some to flow and the respective value of total head, and then obtains one and sets
Standby performance curve, the characteristic intersection point of the resistance of ducting for taking the performance curve of the equipment and step S21 to obtain are the operating mode
Operating point value, it is corresponding that operating point according to corresponding to the operating point value with the rectangular area that origin determines obtains the operating point
Power, the efficiency of the power divided by fluid machines is then obtained into the performance number of actual consumption, the performance number is multiplied by
The time of corresponding operating mode, and then obtain the energy resource consumption value of the operating mode；
S24：The energy resource consumption value of different operating modes is added, obtains the energy resource consumption value under gearshift adjustment；
The effect statistic processes includes：
S31：It is according to the S14 energy resource consumption values obtained under valve regulated：
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<mi>E</mi>
<mi>V</mi>
</msub>
<mo>=</mo>
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<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>N</mi>
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<mi>i</mi>
</mrow>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>t</mi>
<mi>i</mi>
</msub>
</mrow>
Wherein, EVFor the energy resource consumption value under valve regulated, PViFor corresponding performance number under each operating mode, tiFor the operation of each operating mode
Time, 1~N are that each operating mode corresponds to code name；
S32：It is according to the S24 energy resource consumption values obtained under gearshift adjustment：
<mrow>
<msub>
<mi>E</mi>
<mrow>
<mi>I</mi>
<mi>N</mi>
<mi>V</mi>
</mrow>
</msub>
<mo>=</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>N</mi>
</munderover>
<msub>
<mi>P</mi>
<mrow>
<mi>I</mi>
<mi>N</mi>
<mi>V</mi>
<mi>i</mi>
</mrow>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>t</mi>
<mi>i</mi>
</msub>
</mrow>
Wherein, EINVFor the energy resource consumption value under gearshift adjustment, PINViFor corresponding performance number under each operating mode, tiFor the fortune of each operating mode
Row time, 1~N are that each operating mode corresponds to code name；
S33：By the energy resource consumption value E under the gearshift adjustmentINVWith the energy resource consumption value E under valve regulatedVSubtract each other, obtain the energy
Saving value Esave：
Esave=EV-EINV(Kwh)。
2. fluid-mechanic system gearshift adjustment as claimed in claim 1 is with respect to the energy-saving effect detection method of valve regulated, its
It is characterised by：In the step S11, the functional expression of the quadratic function is：
Y=a2x2+a1x+a0
Wherein, y is variable, represents total head, and x is independent variable, represents flow, a0、a1、a2For coefficient to be determined.
3. fluid-mechanic system gearshift adjustment as claimed in claim 1 is with respect to the energy-saving effect detection method of valve regulated, its
It is characterised by：The fluid machines use pump machinery.
4. fluid-mechanic system gearshift adjustment as claimed in claim 3 is with respect to the energy-saving effect detection method of valve regulated, its
It is characterised by：In the step S21, when obtaining the resistance of ducting characteristic curve under specific open degree, some groups of data, generation are gathered
Enter in below equation：
H=KQ2+ΔP；
The relation of pipeline lift and flow is obtained, and then obtains resistance of ducting characteristic curve；Wherein, H is variable, represents that pipeline is raised
Journey, K represent pipe characteristic coefficient, and Q is independent variable, represent flow, and Δ P represents static lift.
5. fluid-mechanic system gearshift adjustment as claimed in claim 1 is with respect to the energy-saving effect detection method of valve regulated, its
It is characterised by：The fluid machines use Fan Devices.
6. fluid-mechanic system gearshift adjustment as claimed in claim 5 is with respect to the energy-saving effect detection method of valve regulated, its
It is characterised by：In the step S21, when obtaining the resistance of ducting characteristic curve under specific open degree, some groups of data are gathered,
Substitute into below equation：
P=KQ2
The resistance of ducting and the relation of flow are obtained, and then obtains resistance of ducting characteristic curve；Wherein, P is variable, represents pipeline resistance
Power, K represent pipe characteristic coefficient, and Q is independent variable, represent flow.
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| US9864383B2 (en) * | 2015-04-02 | 2018-01-09 | Belimo Holding Ag | Method and system for determining characteristic parameters of a hydraulic network |
| CN105864016B (en) * | 2016-04-27 | 2017-12-19 | 西安建筑科技大学 | A kind of more water pump distributing system variable water volume runing adjustment methods of open type |
| CN114135478B (en) * | 2021-11-25 | 2024-02-13 | 国网河北能源技术服务有限公司 | Expected energy-saving effect evaluation method for variable frequency transformation of condensate pump of generator set |
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| CN2415181Y (en) * | 2000-03-24 | 2001-01-17 | 上海铁道大学 | Flow controlling device for pump |
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| KR20040100616A (en) * | 2003-05-23 | 2004-12-02 | 두산중공업 주식회사 | Method for Yielding Orifice Size of Pump Recirculation Line |
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| CN2415181Y (en) * | 2000-03-24 | 2001-01-17 | 上海铁道大学 | Flow controlling device for pump |
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