CN102852782A - Large-scale water pump unit and working condition adjusting mode accurate quantitative model-selection method - Google Patents

Abstract

The invention discloses a large-scale water pump unit and a working condition adjusting mode accurate quantitative model-selection method and belongs to the technical field of pump stations. The method is characterized by comprising the steps of A), firstly choosing various types of feasible pump sizes and number; B), determining the power of matching electrical motors in various feasible pump sizes initially; C), calculating variable working condition annual optimizing operation cost of a pump unit and total device cost caused when a pump station unit is provided with different working condition adjusting modes, the total cost of running and devices of the pump station unit in the period of the service life when a frequency conversion speed-changing adjusting mode, a total angle-changing adjusting mode and a half working condition adjusting mode are arranged for the pump station unit; and comparing total costs of different schemes and determining that the total cost which is the lowest is a best scheme. According to the pump unit device model-selection method, the usage requirement of a pump station can be guaranteed, high efficiency can be achieved, the cost of the device can be saved, and the running cost can be saved. The method can be applied to water pump units of national medium and large pump stations and selection of working condition adjusting modes and optimizing operation, and the electrical energy and the device cost are saved.

Description

A kind of large pump unit and regulating working conditions mode accurate quantification selection method thereof

Technical field

The present invention relates to a kind of water pump assembly selection method, relate in particular to the quantitative selection method of a kind of large pump unit and regulating working conditions mode thereof, belong to the planning of pumping plant and water pump assembly and design selection field.

Background technique

The large pump unit mainly partly is comprised of pump-unit, motor, transmission device and controlling mechanism etc.Traditional water pump assembly selection method: 1. under rated lift, the flow that draws water satisfies the design discharge requirement, and pump efficiency is higher; 2. under average lift, water pump should be in efficient district's work.According to design head of pumping station, (for example usually can't determine unique applicable pump type, rated lift is the pumping plant about 7 m, vertical-type axial-flow pump, horizontal mix-flow pump, vertical mixed flow pump and inclined axial flow and mixed flow pump are all in Applicable scope) and the regulating working conditions mode, do not consider the factors such as the adjusting of water pump and pump stations condition, the variation of pumping plant lift and equipment investment, the result causes the water pump assembly type selecting unreasonable, and operational efficiency is low, causes the waste of operation and cost of equipment.

Summary of the invention

The present invention be according to present large pump Unit Selection exist Consideration not comprehensively, type selecting is unreasonable, cause the problems such as operation and cost of equipment waste.Problem for existing proposes a kind of large pump unit and regulating working conditions mode accurate quantification selection method thereof.The present invention at first just selects and meets all pump assembly schemes that application technology requires, reject obvious irrational scheme, obtain a plurality of feasible programs, each feasible program is adopted different regulating working conditions modes, change and traffic requirement according to the pumping plant lift, optimize the operating conditions of the different run durations of pumping plant, calculate operating cost, under the prerequisite that satisfies the pumping plant usage requirement, the operating cost of computational engineering each feasible program consideration optimization operation in useful life period and the summation of cost of equipment determine that the overall cost the lowest is optimum pump type, auxiliary motor and regulating working conditions mode assembled scheme.The pump assembly Equipments Choosing Method that the present invention proposes can guarantee the usage requirement of pumping plant, and the purpose of can reach again efficient, saving equipment cost is saved operation and cost of equipment more than 2% ~ 5%.

Technological scheme of the present invention is:

A kind of large pump unit and regulating working conditions mode accurate quantification selection method thereof is characterized in that, may further comprise the steps:

A. satisfying under the prerequisite of usage requirement, according to pumping plant feature lift and design discharge, just select several feasible pump types and number of units;

B. according to pumping plant feature lift and pump shaft power, tentatively determine the auxiliary motor power of various feasible pump types;

C. for several feasible pump type of just selecting, when calculating respectively pump assembly and arranging that variable-frequency and variable-speed is regulated, angle is regulated entirely and partly regulate the regulating working conditions mode, pump assembly variable working condition optimization operation annual operating cost:

(1) water pump in pump station unit annual operating cost;

(2) variable-frequency and variable-speed is regulated the pump assembly annual operating cost;

(3) adjusting blade angle water pump assembly annual operating cost;

(4) partly regulate the water pump assembly annual operating cost;

Total cost of equipment when D. calculating the pumping plant unit different regulating working conditions mode being set;

E. calculate the operation and equipment overall cost in useful life period of pumping plant unit, relatively the overall cost of different schemes is big or small, and the scheme that overall cost is economized most is optimal case, and the pump assembly that it is corresponding and regulating working conditions mode also are optimum.

Described several feasible pump type for just selecting calculates respectively that pump assembly arranges that variable-frequency and variable-speed is regulated, angle is regulated entirely and during the regulating working conditions mode such as half adjusting, pump assembly variable working condition optimization moves annual operating cost.In the computational process, the operation lift in a year is a continuous variable, and the service hours in some lifts interval are functions of operation lift, is pumping plant year operation lift Time Density under the ultimate state, utilizes integral method to calculate the pumping plant annual operating cost.The concrete computational process of step C is as follows:

(1) pumping plant year operation lift Time Density determines

According to pumping plant feature lift, the concept of pumping plant year operation lift Time Density is proposed.Pumping plant usually near average lift working time the longest, near H-Max and minimum lift working time the shortest, the characteristics of approximate parabolic distribution.With pump-unit lift H _zBe abscissa, with pumping plant year operation lift Time Density function f (H _z) (its physical significance is dt/dH working time at operation arbitrary lift place unit lift in the range of lift _z) be y coordinate, make pumping plant year operation lift Time Density function relation curve, such as Fig. 2.Wherein, A point, E point and the C abscissa of ordering corresponds respectively to the minimum operation of pumping plant lift H _Zmin, maximum time density operation lift H _ZEWith maximum operation lift H _ZmaxIf pumping plant year operation lift Time Density function f (H _z) by piecewise function f ₁(H _z) and f ₂(H _z) consist of, and the expression of available quadratic polynomial, namely

$f\left(H_z\right)=\left\{\begin{array}{cc}{f}_1\left(H_z\right)=a_1{H_z}^2+b_1{H}_z+{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="120925181948.png,120925181959.png"\; state="\{\{state\}\}">c</figure-callout>}}_1,& H_{z\min }\&le;H_z\&le;H_{\mathrm{zE}}\\ f_2\left(H_z\right)=a_2{H_z}^2+b_2{H}_z+c_2,& H_{\mathrm{zE}}\&le;H_z\&le;H_{z\max }\end{array}\right.---\left(1\right)$

In the formula: a ₁, b ₁, c ₁, a ₂, b ₂And c ₂Be coefficient.

Consider that be T working time in pumping plant year, then function f (H _z) should satisfy following relation:

$\left\{\begin{array}{c}{f}_1\left(H_{z\min }\right)=0\\ {{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="120925181948.png,120925181959.png"\; state="\{\{state\}\}">f</figure-callout>}}_1}^{\&prime;}\left(H_{\mathrm{zE}}\right)=0\\ f_2\left(H_{z\max }\right)=0\\ {f_2}^{\&prime;}\left(H_{\mathrm{zE}}\right)=0\\ f_1\left(H_{\mathrm{zE}}\right)=f_2\left(H_{\mathrm{zE}}\right)\\ {\&Integral;}_{H_{z\min }}^{H_{\mathrm{zE}}}{f}_1\left(H_z\right)d{H}_z+{\&Integral;}_{H_{\mathrm{zE}}}^{H_{z\max }}{f}_2\left(H_z\right)d{H}_z=T\end{array}\right.---\left(2\right)$

By finding the solution above-mentioned equation, can get function f (H _z) coefficient a ₁, b ₁, c ₁, a ₂, b ₂, c ₂

In the certain situation of the flow that draws water, water pump in pump station unit annual operating cost

$F=p\&CenterDot;{\&Integral;}_{t_1}^{t_2}\frac{\mathrm{\&rho;<figure-callout\; id="1000"\; label="gQ\; H\; z"\; filenames="120925181948.png"\; state="\{\{state\}\}">gQ</figure-callout>}{H}_z{}_{}}{1000{\mathrm{\&eta;}}_z\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{dr}}\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{mot}}\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{bp}}}\&CenterDot;b\&CenterDot;\mathrm{dt}=p\&CenterDot;{\&Integral;}_{t_1}^{t_2}\frac{\mathrm{\&rho;<figure-callout\; id="1000"\; label="gQ\; H\; z"\; filenames="120925181948.png"\; state="\{\{state\}\}">gQ</figure-callout>}{H}_z{}_{}}{1000{\mathrm{\&eta;}}_z\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{dr}}\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{mot}}\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{bp}}}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;\mathrm{dt}---\left(3\right)$

In the formula: ρ is the density of water body, and g is gravity accleration, and Q is the unit flow, H _zBe the pump-unit lift, n is unit start number of units, t ₁, t ₂Be respectively the upper and lower limit of integration; η _zBe pump assembly efficiency, η _DrBe transmission efficiency, η _MotBe motor efficiency, η _BpBe converter plant efficient, Q _zBe the pumping plant flow that always draws water.

Because dt=f (H _z) dH _z=f (H _z) H _z' (Q) dQ, then formula (3) can be changed into

$\begin{array}{c}F=p\&CenterDot;{\&Integral;}_{H_{z\min }}^{H_{\mathrm{zE}}}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)d{H}_z+p\&CenterDot;{\&Integral;}_{H_{\mathrm{zE}}}^{H_{z\max }}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)d{H}_z\\ =p\&CenterDot;{\&Integral;}_{Q_1}^{Q_2}\frac{\mathrm{\&rho;gQ}{H}_z\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)H_z^{\&prime;}\left(Q\right)\mathrm{dQ}+p\&CenterDot;{\&Integral;}_{Q_2}^{{\mathrm{<figure-callout\; id="3"\; label="Q"\; filenames="120925181959.png,120925182004.png"\; state="\{\{state\}\}">Q</figure-callout>}}_3}\frac{\mathrm{\&rho;gQ}{H}_z\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)H_z^{\&prime;}\left(Q\right)\mathrm{dQ}\end{array}---\left(4\right)$

In the formula: η _XtBe pump system efficiency, η _Xt=η _zη _Drη _Motη _Bp

(2) variable-frequency and variable-speed is regulated the pump assembly annual operating cost

For the pumping plant that the frequency control of motor speed function is set, can change pumping plant unit operation operating mode by regulating pump rotary speed.Such as Fig. 3, in the water pump slewing range (choosing gear ratio is 0.7 ~ 1.0), pump system efficiency η under the match different rotating speeds _XtThe pump-unit lift H that peak is corresponding _zWith the pump assembly variable-frequency and variable-speed operation optimum operating condition curve of flow Q, such as BCE curve among Fig. 2.Point A, B are respectively minimum device lift, optimum operating condition parabola and lower boundary rotating speed 0.7n _eThe intersection point of pump-unit performance curve; Point E, F are respectively optimum operating condition parabola, largest device lift and coboundary rotation speed n _eThe intersection point of pump-unit performance curve.

Need consumed energy during the RHVC operation, increased the power loss of pumping system.Therefore, if, then should not carry out variable-frequency and variable-speed and move when smaller (this situation occur in reduction of speed) so that pump assembly efficiency improves the operating cost saved less than the operating cost that increases because implementing variable-frequency and variable-speed operation (converter plant efficient＜1) because of variable-frequency and variable-speed operation.Figure mid point C represents the pump assembly separation whether variable-frequency and variable-speed moves, namely as pump-unit lift H _z≤ H _Zc, should carry out the variable-frequency and variable-speed operation; As pump-unit lift H _zH _Zc, then should not carry out the variable-frequency and variable-speed operation, and move in rated speed.Point D is device lift H _ZcWith n _eThe time pump-unit performance curve intersection point.

On water pump system optimum operating condition curve B CE, the E point is the most effective point of water pump system, and along with the reduction of running speed, motor efficiency decreases, and water pump system efficient also decreases.E point lift is E point maximum time density operation lift H among Fig. 2 among Fig. 3 _ZEAs device lift H _z＜H _ZB, pump assembly should be at 0.7n _eThe rotating speed operation; As device lift H _ZB≤ H _z≤ H _ZC, pump assembly should be implemented the variable-frequency and variable-speed operation; As pump-unit lift H _zH _ZC, pump assembly should break away from converter plant and move in rated speed.Therefore, calculating path is AB → BC → DE → EF, and formula (4) can be changed into

$\begin{array}{c}F=p\&CenterDot;{\&Integral;}_{Q_1}^{Q_2}\frac{\mathrm{\&rho;gQ}{H}_z\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)H_z^{\&prime;}\left(Q\right)\mathrm{dQ}+p\&CenterDot;{\&Integral;}_{Q_2}^{{\mathrm{<figure-callout\; id="3"\; label="Q"\; filenames="120925181959.png,120925182004.png"\; state="\{\{state\}\}">Q</figure-callout>}}_3}\frac{\mathrm{\&rho;gQ}{H}_z\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)H_z^{\&prime;}\left(Q\right)\mathrm{dQ}\\ =p\&CenterDot;{\&Integral;}_{Q_A}^{Q_B}\frac{\mathrm{\&rho;gQ}{H}_{z1}\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right){\mathrm{<figure-callout\; id="1"\; label="H\; z"\; filenames="120925181948.png,120925181959.png"\; state="\{\{state\}\}">H</figure-callout>}}_z^1\left(Q\right)\mathrm{dQ}+p\&CenterDot;{\&Integral;}_{Q_B}^{Q_C}\frac{\mathrm{\&rho;gQ}{H}_{z2}\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}2}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)H_{z2}^{\&prime;}\left(Q\right)\mathrm{dQ}\\ +p\&CenterDot;{\&Integral;}_{Q_D}^{Q_E}\frac{\mathrm{\&rho;gQ}{H}_{z3}\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}3}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right){\mathrm{<figure-callout\; id="3"\; label="H\; z"\; filenames="120925181959.png,120925182004.png"\; state="\{\{state\}\}">H</figure-callout>}}_z^3\left(Q\right)\mathrm{dQ}+p\&CenterDot;{\&Integral;}_{Q_E}^{Q_F}\frac{\mathrm{\&rho;gQ}{H}_{z3}\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}3}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}{f}_2\left(H_z\right){\mathrm{<figure-callout\; id="3"\; label="H\; z"\; filenames="120925181959.png,120925182004.png"\; state="\{\{state\}\}">H</figure-callout>}}_z^3\left(Q\right)\mathrm{dQ}\end{array}---\left(5\right)$

(3) adjusting blade angle water pump assembly annual operating cost

For the pump assembly that the blade adjustments function is set, can change pumping plant unit operation operating mode by regulating water pump blade angle, save operating cost.Find the solution pump system efficiency peak under the different device lift, make pump assembly angle operation optimum operating condition curve, as shown in Figure 4, pumping system optimum operating condition curve when arrow place curve is the angle operation among the figure.Pump system efficiency peak when point A, E, C are respectively minimum device lift, maximum time density operation lift, largest device lift.Pump system efficiency peak under other device lifts can utilize cubic spline interpolation to find the solution.

Full pumping plant unit annual operating cost can be expressed as

$\begin{array}{c}F=p\&CenterDot;{\&Integral;}_{H_{z\min }}^{H_{\mathrm{zE}}}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)d{H}_z+p\&CenterDot;{\&Integral;}_{H_{\mathrm{zE}}}^{H_{z\max }}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)d{H}_z\\ =p\&CenterDot;{\&Integral;}_{H_{\mathrm{zA}}}^{H_{\mathrm{zE}}}\frac{\mathrm{\&rho;gQ}{\left(H_z\right)H}_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)d{H}_z+p\&CenterDot;{\&Integral;}_{H_{\mathrm{zE}}}^{H_{\mathrm{zC}}}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)d{H}_z\end{array}---\left(6\right)$

(4) partly regulate the water pump assembly annual operating cost

Partly do not regulate water pump assembly for what do not change blade angle in running, its annual operating cost formula still can adopt formula (6), but path of integration becomes along pump-unit performance curve under the set angle and changes to H-Max from minimum lift.

Total cost of equipment when calculating pumping plant unit arranges different regulating working conditions mode mainly comprises main water pump, driving mechanism (such as gear-box), auxiliary motor (single speed motor, two-speed motor), propeller regulating mechanism, frequency variator etc.

For a certain pumping plant, different regulating working conditions modes is set, the pump equipment basic charge is identical, such as 2800ZGQ-2.5 pump assembly equipment price in 2010 is: 500,000 yuan/platform of high-speed motor; 1,500,000 yuan/platform of slow-speed motor; 1,000,000 yuan of gear-boxes/cover, every sleeve gear case service life is 10 years, motor is 20 years with pumps design working life, at motor and gear-box of water pump lifetime domestic demand replacing.The price difference of double speed change pole motor and single speed motor is 800,000 yuan/platform; Frequency variator and Installation and Debugging expense are 1200 yuan/kW; Propeller regulating mechanism and mounting cost are 800,000 yuan/cover.

Calculate the operation and equipment overall cost in useful life period of pumping plant unit, compare the overall cost size of different schemes, the scheme that overall cost is economized most is optimal case, and the pump assembly that it is corresponding and regulating working conditions mode also are optimum.

Pumping plant unit operation and equipment overall cost comprise overall running cost and equipment investment expense in useful life period.Variable-frequency and variable-speed is regulated, angle is regulated entirely and half pumping plant of regulating for adopting, and overall cost can use respectively formula (7) ~ (9) to calculate, namely

F _Ts=F _y×t +(F _mot + F _bp + F _dr)×m (7)

F _Tq=F _y×t +(F _mot + F _tj + F _dr)×m (8)

F _Tb=F _y×t +(F _mot + F _dr)×m (9)

In the formula: F _Ts, F _Tq, F _TbBe respectively variable-frequency and variable-speed is regulated, angle is regulated entirely and partly regulate pumping plant unit operation and equipment overall cost, F _yBe the pumping plant annual operating cost, t is pumping plant lifetime (being generally 20 years), F _MotBe motor cost, F _BpBe frequency variator cost, F _TjBe the full controlling mechanism cost of blade, F _DrBe the transmission device cost, m is pumping plant installation number of units.

The present invention adopts just to select and meets all pump assembly schemes that application technology requires, reject obvious irrational scheme, obtain a plurality of feasible programs, each feasible program is adopted different regulating working conditions modes, change and traffic requirement according to the pumping plant lift, optimize the operating conditions of the different run durations of pumping plant, calculate operating cost, under the prerequisite that satisfies the pumping plant usage requirement, the operating cost of computational engineering each feasible program consideration optimization operation in useful life period and the summation of cost of equipment determine that the overall cost the lowest is optimum pump type, auxiliary motor and regulating working conditions mode assembled scheme.The pump assembly Equipments Choosing Method that the present invention proposes can guarantee the usage requirement of pumping plant, and the purpose of can reach again efficient, saving equipment cost is saved operation and cost of equipment.The present invention can be applicable to the selection and optimization operation of national big-and-middle-sized water pump in pump station unit and regulating working conditions mode thereof, saves electric energy and cost of equipment, according to the Multi-instance application result, can reduce expenses more than 2% ~ 5%.By national large pumping station 2,500 ten thousand kW that install, move every year 1000h, 0.8 yuan/kWh of electricity price calculates, use the present invention after, can save 4 ~ 1,000,000,000 yuan.Be conducive to the benign development of hydraulic engineering, give full play to pumping plant usefulness, promote the construction of harmonious society, have great social economic benefit.

Description of drawings

Fig. 1 is selection method step schematic representation of the present invention.

Fig. 2 is pumping plant year operation lift Time Density function relation curve.

Fig. 3 is pump assembly variable-frequency and variable-speed operation optimum operating condition curve.

Fig. 4 is pump assembly angle operation optimum operating condition curve.

Fig. 5 is embodiment's pump type 1 device performance curve.

Fig. 6 is embodiment's pump type 2 device performance curves.

Fig. 7 is embodiment's pump type 3 device performance curves.

Embodiment

Adopt technological scheme of the present invention, the invention will be further described below in conjunction with accompanying drawing 5 ~ 7 and case, but present case should not be construed as limitation of the present invention.

Certain pumping plant requires to have simultaneously water transfer and water drainage function, water transfer h working times design year 5000, water transfer design discharge 150 m ³/ s, water transfer rated lift 2.35 m, average lift 2.05 m, minimum lift 1.45 m, H-Max 2.75 m; Pumping plant water drainage rated lift 4.25 m, H-Max 4.75 m.

Generally speaking, gearbox drive efficient, high speed electric engine efficiency can reach respectively 98%, 96%, then the product of motor efficiency and gearbox drive efficient is 98% * 96%=94%, being lower than low-speed electronic engine efficiency 95%(direct-connection transmission efficient is 100%), and gear-box is shorter working life, only has half of motor working life.Within the operation period, the cost of equipment of the supporting high-speed motor of gearbox drive is higher than the cost of equipment of the supporting slow-speed motor of direct-connection transmission.Therefore, when this pumping plant unit regulating working conditions mode of research, only consider to adopt slow-speed motor, direct-connection transmission mode, and do not consider high-speed motor, gearbox drive mode.

Can find out that according to pumping plant feature lift pumping plant water drainage rated lift is greater than the water transfer rated lift, and both differ larger.Therefore, need to select suitable pump type, auxiliary motor power and regulating working conditions mode, can safe and stable operation when the water drainage operating mode to satisfy pumping plant, when the water transfer operating mode, can realize variable parameter operation, with the saving operating cost.

According to Preliminary Analysis Results, pumping plant should be selected the wider pump type of lift adaptability, and selects auxiliary motor power according to the water drainage operating mode.The below carries out economic analysis to 3 kinds of pump types just selecting respectively.

(1) pump type 1 feasible program economy relatively

By the pump type 1 that the water drainage operating mode is selected, impeller diameter is 3140 mm, and rated speed is 125 r/min, and the pump-unit performance is shown in solid line among Fig. 5, and pump assembly efficiency is higher during the water drainage operating mode, is about 79%; But pump assembly efficiency is lower during the water transfer operating mode, is about 65%, and working time in pumping plant water transfer operating mode year is longer, so the pumping plant annual operating cost is higher.

For realize this stand in when water drainage unit can safety, stable operation, the purpose that the pumping station operation expense is economized during water transfer, rational regulating working conditions scheme when needing research water transfer operating mode.

Scheme one: adopt and partly regulate water pump, single speed motor direct-connection transmission, electromotor diameter is 3160 mm, and number of pole-pairs is 24.Water pump is in rated speed, design angle (0 °) operation during water transfer.Utilize the computational methods of operating cost in the pumping plant lifetime that proposes previously, drawing the pump assembly operating cost is 1947.3825 ten thousand yuan/year, considers the motor apparatus expense, and overall cost is 39997.650 ten thousand yuan in the pumping plant lifetime.

Scheme two: adopt and partly regulate water pump, single speed motor direct-connection transmission, RHVC, adopt the variable-frequency and variable-speed operation during water transfer.Be 1735.7620 ten thousand yuan/year by calculating the pump assembly operating cost, consider motor apparatus expense and converter plant and Installation and Debugging expense, overall cost is 37585.240 ten thousand yuan in the pumping plant lifetime.

Scheme three: adopt blade entirely to regulate water pump, supporting two-speed motor direct-connection transmission, water pump 93 r/min low cruises during water transfer by regulating water pump blade angle, are realized the operation of pumping plant water transfer operation optimization.Improve pump rotary speed to rated speed by the pole-changing reduction of speed during water drainage.Full pump-unit performance curve such as Fig. 5 (dotted line is the pump-unit performance behind the pole-changing reduction of speed) that regulates the supporting two-speed motor of water pump.Be 1756.7213 ten thousand yuan/year by calculating pump assembly angle operating cost, consider equipment price difference and adjusting blade angle structural establishment and the mounting cost of two-speed motor and single speed motor, the interior overall cost of pumping plant lifetime is 37304.425 ten thousand yuan.

Motor speed is reduced to 93 r/min during the water transfer operating mode, and according to number of pole-pairs formula p=60f/n, the number of pole-pairs that gets motor is 32.In magnet pole widths one regularly, electromotor diameter is directly proportional with number of pole-pairs, and the electromotor diameter that then slow-speed of revolution 93 r/min are corresponding is 4220 mm, and this moment, the bulb ratio of water pump was 1.344, and the bulb of existing through-flow pump unit is than bigger than normal.If the motor manufacturing technology can be so that the electromotor diameter of 32 numbers of pole-pairs reduces, the bulb ratio is reduced to about 1.0, and the scheme that adopts two-speed motor to regulate operating mode is feasible.

Scheme four: adopt and partly to regulate water pump, two-speed motor direct-connection transmission, water pump low speed during water transfer, move at design angle (0 °).Be 1755.4436 ten thousand yuan/year by calculating the pump assembly operating cost, consider the cost of equipment that two-speed motor increases, overall cost is 36718.872 ten thousand yuan in the pumping plant lifetime.This scheme pumping plant flow regulating function is relatively poor, if use this scheme, should guarantee that also unit can start smoothly under the water drainage lift.

Scheme five: adopt and partly regulate water pump, two-speed motor direct-connection transmission and converter plant, motor pole-changing fall-back during water transfer is so that the water pump low cruise adopts frequency control of motor speed to realize the optimization operation of water transfer operating mode simultaneously.Be 1668.2859 ten thousand yuan/year by calculating the pump assembly operating cost, consider converter plant and Installation and Debugging expense and the two-speed motor installation cost of increase, overall cost is 36795.718 ten thousand yuan in the pumping plant lifetime.

Pumping plant annual operating cost and equipment investment such as the table 1 of various regulating working conditions schemes.

Table 1 pumping plant unit regulating working conditions mode expense is (pump type 1) relatively

As can be seen from Table 1, scheme four overall costs are minimum, reduce expenses 8.93%, 2.36%, 1.59%, 0.21% than scheme one, scheme two, scheme three, scheme five respectively.

(2) pump type 2 feasible program economy relatively

Pump type 2 water pump vane diameters 3300 mm, rated speed 125 r/min, device performance curve such as Fig. 6.Can find out that pump assembly efficiency is higher near low lift 2.35 m, reaches about 79%; Pump-unit can reach about 70% when high-lift 4.25 m, has satisfied the requirement of pumping plant water drainage and water transfer.

Because pumping plant when water drainage lift is higher, for pumping plant can safe and stable operation when the water drainage, the motor nonoverload, water pump should be selected auxiliary motor according to the water drainage operating mode.

If require pump capacity maximum during water drainage, then water pump is in maximum blade angle (+4 °) operation, and the auxiliary motor power that needs during water drainage lift 4.75 m is for being about 2700 kW.At this moment, induction-motor load rate corresponding to water transfer operating mode is lower, and the Rate of load condensate of motor is less than 50% when the water transfer rated lift, and motor efficiency is lower, and the pumping station operation expense is higher.

If when water drainage without specific requirement, then can transfer to the water pump blade angle minimum (6 °) operation to uninterrupted when water drainage, or fall-back, guarantee the motor nonoverload.Water drainage lift 4.75 m, when the blade angle-6 ° auxiliary motor power that operation needs for being about 1600 kW, at this moment, induction-motor load rate corresponding to water transfer operating mode reaches about 75%, motor efficiency obviously improves.

When water drainage lift 4.75 m, when water pump moved at design angle (4 °), the auxiliary motor power that needs was about 1800 kW.At this moment, when water pump transfers the water drainage operating mode to from the water transfer operating mode, need not the adjusting vane angle.

The pumping plant annual operating cost of various motor match powers and regulating working conditions scheme and pumping plant interior overall cost of useful life period are as shown in table 2.

Table 2 pumping plant unit and regulating working conditions mode expense be (pump type 2) relatively

As can be seen from Table 2, during different motor match power, water pump when the operation of design angle, rated speed the pumping plant overall cost of (scheme one, scheme four, scheme seven) all the pumping plant overall cost than other regulating working conditions modes is lower.Wherein, the pumping plant overall cost of scheme four is minimum.Because in order to prevent electromotor overload when draining flooded fields operating mode, scheme four needs to shut down turn blade angle down, operating process is comparatively loaded down with trivial details and expend higher.Scheme seven motor power (output) when the water drainage operating mode can meet the demands, and the pumping plant overall cost is lower during the water transfer operating mode.Scheme seven reduces expenses 1.16%, 1.78%, 2.11% than scheme one, scheme eight and scheme nine respectively, than the highest scheme three cost savings 3.96% of overall cost.

Therefore, when pumping plant adopted pump type 2, scheme seven adopted auxiliary motor power 1800 kW, and when design angle, rated speed operation, the pumping plant overall cost is economized most, and pumping plant can safe operation when water drainage.

(3) pump type 3 feasible program economy relatively

Pump type 3 water pump vane diameters are 3300 mm, rotating speed 125 r/min, and the maximum pump unit efficiency reaches about 80% when low lift 2.35 m; Pump-unit reaches as high as about 81% more than 75% when high-lift 4.25 m, pump-unit performance curve such as Fig. 7.Therefore, pump type 3 all can efficiently move when water transfer and water drainage.

When water drainage lift 4.75 m, if require pump capacity maximum, then water pump is in maximum blade angle (+4 °) operation, and the auxiliary motor power of is for being about 2550 kW.At this moment, pump assembly efficiency corresponding to water transfer operating mode is lower, and the induction-motor load rate only is 64.6%.If water pump is-2 ° or-4 ° of operations, the auxiliary motor power that then needs is about 1800 kW, and at this moment, pump assembly efficiency corresponding to water transfer operating mode is higher.

Pumping plant overall cost such as table 3 in the pumping plant annual operating cost of various motor match powers and regulating working conditions scheme and useful life period.

Table 3 pumping plant unit regulating working conditions mode expense is (pump type 3) relatively

As can be seen from Table 3, scheme four adopts the motor match powers be 1800 kW, water pump-4 °, during the rated speed operation, overall cost is minimum; Than high scheme eight cost savings 6.24% of Cost, save nearly 2,200 ten thousand yuan.

In all 24 kinds of schemes of 3 kinds of pump types, the unit operation operating mode is not regulated 9 kinds of schemes, and wherein, pump type 3 schemes four overall costs are minimum, are 35182.903 ten thousand yuan.Unit operation operating mode adjusting blade angle 6 kinds of schemes are arranged, wherein, pump type 3 schemes two overall costs are minimum, are 35873.191 ten thousand yuan.The frequency control of motor speed of unit operation operating mode is regulated 9 kinds of schemes, and wherein, pump type 3 schemes five overall costs are minimum, are 36039.693 ten thousand yuan.

The unit operation operating mode is the regulation scheme network minimal not, but regulatory function is the poorest.Consider and improve the draw water adjustability of flow of pumping plant that reduce startup of unit power, the pumping plant unit should arrange necessary regulatory function.Adjusting blade angle can additionally not increase the power loss of pumping system.The reliability of frequency control of motor speed regulative mode, start/stop machine characteristic and flow-adjusting characteristics all are better than the adjusting blade angle mode, but equipment investment is larger.

The optimal case that the operating mode of present embodiment is not regulated, adjusting blade angle and variable-frequency and variable-speed are regulated three kinds of regulative modes all concentrates on pump type 3, and the better performances that pump type 3 is own be described.Pump type 3 schemes two adopt adjusting blade angle, can guarantee that pumping plant interior overall cost of useful life period is lower, can take into account again the requirement of regulatory function, and this scheme is compared cost saving 4.8% with pump type 1 scheme two that adopts frequency control of motor speed.Therefore, this pumping plant should be selected pump type 3 schemes two, auxiliary motor power 1800 kW, angle regulating working conditions mode.

Claims (6)

1. a large pump unit and regulating working conditions mode accurate quantification selection method thereof is characterized in that, may further comprise the steps:

A. satisfying under the prerequisite of usage requirement, according to pumping plant feature lift and design discharge, just select several feasible pump types and number of units;

B. according to pumping plant feature lift and pump shaft power, tentatively determine the auxiliary motor power of various feasible pump types;

C. for several feasible pump type of just selecting, when calculating respectively pump assembly and arranging that variable-frequency and variable-speed is regulated, angle is regulated entirely and partly regulate the regulating working conditions mode, pump assembly variable working condition optimization operation annual operating cost:

(1) water pump in pump station unit annual operating cost;

(2) variable-frequency and variable-speed is regulated the pump assembly annual operating cost;

(3) adjusting blade angle water pump assembly annual operating cost;

(4) partly regulate the water pump assembly annual operating cost;

Total cost of equipment when D. calculating the pumping plant unit different regulating working conditions mode being set;

E. calculate the operation and equipment overall cost in useful life period of pumping plant unit, relatively the overall cost of different schemes is big or small, and the scheme that overall cost is economized most is optimal case, and the pump assembly that it is corresponding and regulating working conditions mode also are optimum.

2. a kind of large pump unit according to claim 1 and regulating working conditions mode accurate quantification selection method thereof is characterized in that step C(1) being calculated as of described water pump in pump station unit annual operating cost:

According to pumping plant feature lift, the concept of pumping plant year operation lift Time Density is proposed; Pumping plant usually near average lift working time the longest, near H-Max and minimum lift working time the shortest, the characteristics of approximate parabolic distribution; With pump-unit lift H _zBe abscissa, with pumping plant year operation lift Time Density function f (H _z) be y coordinate, make pumping plant year operation lift Time Density function relation curve, dt/dH working time of arbitrary lift place unit lift in the operation range of lift _z, the abscissa that A point, E point and C are ordered in the relation curve corresponds respectively to the minimum operation of pumping plant lift H _Zmin, maximum time density operation lift H _ZEWith maximum operation lift H _Zmax, establish pumping plant year operation lift Time Density function f (H _z) by piecewise function f ₁(H _z) and f ₂(H _z) consist of, and the expression of available quadratic polynomial, namely

$f\left(H_z\right)=\left\{\begin{array}{cc}{f}_1\left(H_z\right)=a_1{H_z}^2+b_1{H}_z+c_1,& H_{z\min }\&le;H_z\&le;H_{\mathrm{zE}}\\ f_2\left(H_z\right)=a_2{H_z}^2+b_2{H}_z+c_2,& H_{\mathrm{zE}}\&le;H_z\&le;H_{z\max }\end{array}\right.$

In the formula: a ₁, b ₁, c ₁, a ₂, b ₂And c ₂Be coefficient;

Consider that be T working time in pumping plant year, then function f (H _z) should satisfy following relation:

$\left\{\begin{array}{c}{f}_1\left(H_{z\min }\right)=0\\ {f_1}^{\&prime;}\left(H_{\mathrm{zE}}\right)=0\\ f_2\left(H_{z\max }\right)=0\\ {f_2}^{\&prime;}\left(H_{\mathrm{zE}}\right)=0\\ f_1\left(H_{\mathrm{zE}}\right)=f_2\left(H_{\mathrm{zE}}\right)\\ {\&Integral;}_{H_{z\min }}^{H_{\mathrm{zE}}}{f}_1\left(H_z\right)d{H}_z+{\&Integral;}_{H_{\mathrm{zE}}}^{H_{z\max }}{f}_2\left(H_z\right)d{H}_z=T\end{array}\right.$

By finding the solution above-mentioned equation, can get function f (H _z) coefficient a ₁, b ₁, c ₁, a ₂, b ₂, c ₂

In the certain situation of the flow that draws water, water pump in pump station unit annual operating cost,

$F=p\&CenterDot;{\&Integral;}_{t_1}^{t_2}\frac{\mathrm{\&rho;gQ}{H}_z}{1000{\mathrm{\&eta;}}_z\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{dr}}\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{mot}}\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{bp}}}\&CenterDot;b\&CenterDot;\mathrm{dt}=p\&CenterDot;{\&Integral;}_{t_1}^{t_2}\frac{\mathrm{\&rho;gQ}{H}_z}{1000{\mathrm{\&eta;}}_z\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{dr}}\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{mot}}\&CenterDot;{\mathrm{\&eta;}}_{\mathrm{bp}}}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;\mathrm{dt}$

In the formula: ρ is the density of water body, and g is gravity accleration, and Q is the unit flow, H _zBe the pump-unit lift, n is unit start number of units, t ₁, t ₂Be respectively the upper and lower limit of integration; η _zBe pump assembly efficiency, η _DrBe transmission efficiency, η _MotBe motor efficiency, η _BpBe converter plant efficient, Q _zBe the pumping plant flow that always draws water;

Because dt=f (H _z) dH _z=f (H _z) H _z' (Q) dQ, then formula is

$\begin{array}{c}F=p\&CenterDot;{\&Integral;}_{H_{z\min }}^{H_{\mathrm{zE}}}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)d{H}_z+p\&CenterDot;{\&Integral;}_{H_{\mathrm{zE}}}^{H_{z\max }}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)d{H}_z\\ =p\&CenterDot;{\&Integral;}_{Q_1}^{Q_2}\frac{\mathrm{\&rho;gQ}{H}_z\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)H_z^{\&prime;}\left(Q\right)\mathrm{dQ}+p\&CenterDot;{\&Integral;}_{Q_2}^{Q_3}\frac{\mathrm{\&rho;gQ}{H}_z\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)H_z^{\&prime;}\left(Q\right)\mathrm{dQ}\end{array}$

In the formula: η _XtBe pump system efficiency, η _Xt=η _zη _Drη _Motη _Bp

3. a kind of large pump unit according to claim 1 and regulating working conditions mode accurate quantification selection method thereof is characterized in that step C(2) described variable-frequency and variable-speed regulates being calculated as of pump assembly annual operating cost:

For the pumping plant that the frequency control of motor speed function is set, change pumping plant unit operation operating mode by regulating pump rotary speed, in the water pump slewing range, choosing gear ratio is 0.7 ~ 1.0,, pump system efficiency η under the match different rotating speeds _XtThe pump-unit lift H that peak is corresponding _zWith the pump assembly variable-frequency and variable-speed operation optimum operating condition curve of flow Q, performance curve BCE mid point of curve A, B are respectively minimum device lift, optimum operating condition parabola and lower boundary rotating speed 0.7n _eThe intersection point of pump-unit performance curve; Point E, F are respectively optimum operating condition parabola, largest device lift and coboundary rotation speed n _eThe intersection point of pump-unit performance curve;

Need consumed energy during the RHVC operation, increased the power loss of pumping system; Therefore, if because of variable-frequency and variable-speed operation so that pump assembly efficiency improves the operating cost saved less than because implementing the variable-frequency and variable-speed operation, converter plant efficient＜1, and the operating cost that increases then should not carry out variable-frequency and variable-speed to move; Point C represents the pump assembly separation whether variable-frequency and variable-speed moves, namely as pump-unit lift H _z≤ H _Zc, should carry out the variable-frequency and variable-speed operation; As pump-unit lift H _z＞H _Zc, then should not carry out the variable-frequency and variable-speed operation, and move in rated speed; Point D is device lift H _ZcWith n _eThe time pump-unit performance curve intersection point;

On water pump system optimum operating condition curve B CE, the E point is the most effective point of water pump system, and along with the reduction of running speed, motor efficiency decreases, and water pump system efficient also decreases; E point lift is maximum time density operation lift H _ZEAs device lift H _z＜H _ZB, pump assembly should be at 0.7n _eThe rotating speed operation; As device lift H _ZB≤ H _z≤ H _ZC, pump assembly should be implemented the variable-frequency and variable-speed operation; As pump-unit lift H _zH _ZC, pump assembly should break away from converter plant and move in rated speed; Calculating path is AB → BC → DE → EF, and formula is:

$\begin{array}{c}F=p\&CenterDot;{\&Integral;}_{Q_1}^{Q_2}\frac{\mathrm{\&rho;gQ}{H}_z\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)H_z^{\&prime;}\left(Q\right)\mathrm{dQ}+p\&CenterDot;{\&Integral;}_{Q_2}^{Q_3}\frac{\mathrm{\&rho;gQ}{H}_z\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)H_z^{\&prime;}\left(Q\right)\mathrm{dQ}\\ =p\&CenterDot;{\&Integral;}_{Q_A}^{Q_B}\frac{\mathrm{\&rho;gQ}{H}_{z1}\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)H_{z1}^{\&prime;}\left(Q\right)\mathrm{dQ}+p\&CenterDot;{\&Integral;}_{Q_B}^{Q_C}\frac{\mathrm{\&rho;gQ}{H}_{z2}\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}2}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)H_{z2}^{\&prime;}\left(Q\right)\mathrm{dQ}\\ +p\&CenterDot;{\&Integral;}_{Q_D}^{Q_E}\frac{\mathrm{\&rho;gQ}{H}_{z3}\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}3}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)H_{z3}^{\&prime;}\left(Q\right)\mathrm{dQ}+p\&CenterDot;{\&Integral;}_{Q_E}^{Q_F}\frac{\mathrm{\&rho;gQ}{H}_{z3}\left(Q\right)}{1000{\mathrm{\&eta;}}_{\mathrm{xt}3}\left(Q\right)}\&CenterDot;\frac{Q_z}{Q}{f}_2\left(H_z\right)H_{z3}^{\&prime;}\left(Q\right)\mathrm{dQ}\end{array}$

4. a kind of large pump unit according to claim 1 and regulating working conditions mode accurate quantification selection method thereof is characterized in that step C(3) being calculated as of described adjusting blade angle water pump assembly annual operating cost:

For the pump assembly that the blade adjustments function is set, change pumping plant unit operation operating mode by regulating water pump blade angle, save operating cost; Find the solution pump system efficiency peak under the different device lift, make pump assembly angle operation optimum operating condition curve; Pump system efficiency peak when performance curve mid point A, E, C are respectively minimum device lift, maximum time density operation lift, largest device lift; Pump system efficiency peak under other device lift can utilize cubic spline interpolation to find the solution;

Full pumping plant unit annual operating cost is expressed as

$\begin{array}{c}F=p\&CenterDot;{\&Integral;}_{H_{z\min }}^{H_{\mathrm{zE}}}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)d{H}_z+p\&CenterDot;{\&Integral;}_{H_{\mathrm{zE}}}^{H_{z\max }}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)d{H}_z\\ =p\&CenterDot;{\&Integral;}_{H_{\mathrm{zA}}}^{H_{\mathrm{zE}}}\frac{\mathrm{\&rho;gQ}{\left(H_z\right)H}_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)d{H}_z+p\&CenterDot;{\&Integral;}_{H_{\mathrm{zE}}}^{H_{\mathrm{zC}}}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)d{H}_z\end{array}$

5. a kind of large pump unit according to claim 1 and regulating working conditions mode accurate quantification selection method thereof is characterized in that step C(4) describedly partly regulate being calculated as of water pump assembly annual operating cost:

Partly do not regulate water pump assembly for what do not change blade angle in running, its annual operating cost formula adopts $\begin{array}{c}F=p\&CenterDot;{\&Integral;}_{H_{z\min }}^{H_{\mathrm{zE}}}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)d{H}_z+p\&CenterDot;{\&Integral;}_{H_{\mathrm{zE}}}^{H_{z\max }}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)d{H}_z\\ =p\&CenterDot;{\&Integral;}_{H_{\mathrm{zA}}}^{H_{\mathrm{zE}}}\frac{\mathrm{\&rho;gQ}{\left(H_z\right)H}_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_1\left(H_z\right)d{H}_z+p\&CenterDot;{\&Integral;}_{H_{\mathrm{zE}}}^{H_{\mathrm{zC}}}\frac{\mathrm{\&rho;gQ}\left(H_z\right)H_z}{1000{\mathrm{\&eta;}}_{\mathrm{xt}}\left(H_z\right)}\&CenterDot;\frac{Q_z}{Q}\&CenterDot;f_2\left(H_z\right)d{H}_z\end{array}$

Path of integration is for to change to H-Max along pump-unit performance curve under the set angle from minimum lift.

6. a kind of large pump unit according to claim 1 and regulating working conditions mode accurate quantification selection method thereof, it is characterized in that, the described calculating pumping plant of step e unit is operation and equipment overall cost in useful life period, variable-frequency and variable-speed is regulated, angle is regulated entirely and the overall cost of half pumping plant of regulating is calculated with following three formulas respectively for adopting, namely

Variable-frequency and variable-speed is regulated pumping plant unit: F _Ts=F _y* t+(F _Mot+ F _Bp+ F _Dr) * m

Angle is regulated pumping plant unit: F entirely _Tq=F _y* t+(F _Mot+ F _Tj+ F _Dr) * m

The half pumping plant unit of regulating: F _Tb=F _y* t+(F _Mot+ F _Dr) * m

In the formula: F _Ts, F _Tq, F _TbBe respectively variable-frequency and variable-speed is regulated, angle is regulated entirely and partly regulate pumping plant unit operation and equipment overall cost, F _yBe the pumping plant annual operating cost, t is pumping plant lifetime 20 years, F _MotBe motor cost, F _BpBe the frequency variator cost,

F _TjBe the full controlling mechanism cost of blade, F _DrBe the transmission device cost, m is pumping plant installation number of units.

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