CN102184305A - Pumping station technical reconstruction mathematical model - Google Patents

Abstract

The invention relates to a pumping station technical reconstruction mathematical model, in particular to a key link capable of calculating efficiency of a pumping station and determining technical reconstruction of the pumping station so as to increase running efficiency of the pumping station and reduce energy consumption. More than 50 percent of the pumping stations established in China are in extended service and equipment are seriously aged, therefore, the pumping stations have low running reliability, low running efficiency and high energy consumption. Hundreds of billions of money is needed for reconstructing the pumping stations; and investing a large amount of money in a short time for reconstruction is difficult under the present financial situation. Therefore, the technical reconstruction of the pumping station is a cost-saving and high-efficiency important approach in running management of the pumping station. A fitting coefficient is calculated according to a performance parameter of the water pump, namely flow rate and axial power for running of the water pump can be calculated. The flow rate, the axial power, head of the pumping station, head of a water pump device, power of a matched motor and the like are substituted into the pumping station technical reconstruction mathematical model, so that efficiency of the pumping station can be calculated, problems existing in the running of the pumping station and reasons for low running efficiency are found, and the key link for the technical reconstruction of the pumping station is found.

Description

Pumping plant technological transformation mathematical model

1. affiliated technical field

The present invention relates to pumping plant technological transformation mathematical model, especially can calculate efficiency of pumping station, determine the key link of pumping plant technological transformation, and then improve the efficient of pumping station operation, reduce the energy resource consumption of pumping station operation.

2. background technology

Whole nation rural work meeting and " State Council of the Central Committee of the Communist Party of China is about strengthening the decision of water conservancy reform and development " are pointed out " the vital task of irrigation and water conservancy as rural infrastructure development "; " to be a member of a political party the water conservancy working pendulum and the outstanding more position of national career development, put forth effort to accelerate construction of water conservancy works, promote water conservancy and realize great-leap-forward development "." 12 planning outline " pointed out: " ... accelerate big-and-middle-sized irrigated area, the supporting transformation of the row's of filling pumping plant ... "

Irrigation and drainage pumping station is a very important ingredient in the farm irrigation facility, and it has irreplaceable effect to field irrigation, draining, water supply, flood control etc.

At present China has built up surplus the pumping plant 50 of field irrigation and draining ten thousand, pumping plant total installation of generating capacity 7019.6 ten thousand kW, and annual water lift amount is 1,500 hundred million m ³, the irrigation and the draining total area reach 3,400 ten thousand hm ², born the farmland under irrigation of China 55% and the water supply and the draining task of 36% farmland water drainage area.

China has built that to have in the pumping plant more than 50% be to build up in the past the eighties in last century, there are more than 50% extended active duty, operation in spite of illness, ageing equipment serious in these pumping plants, cause that the pumping station operation reliability is lower, operational efficiency is low, energy resource consumption is big, efficiency of pumping station only about 40%, energy unit consumption is greater than 7.0kWh/ (ktm).Efficiency of pumping station and energy unit consumption are far below " pumping plant technical management rules " requirement (SL255-2000).As rebuild these pumping plants and will need hundreds billion of first funds, under financial resources situation at present, be difficult in and drop into substantial contribution in a short time aging serious pumping plant is rebuild.Therefore, pumping plant being undergone technological transformation is grand important channel, cost saving effect in the pumping station operation management.

For doing the pumping plant technological transformation well, studied pumping plant technological transformation mathematical model.

3. summary of the invention

Pumping plant technological transformation mathematical model is

${\mathrm{\η}}_{\mathrm{ST}}=\frac{\mathrm{\ρgQ}{H}_{\mathrm{ST}}}{{\mathrm{PP}}_m^3}(0.3733P^3-{0.88P}^2{P}_m+0.696{\mathrm{PP}}_m^2+0.74P_m^3)---\left(1\right)$

η in the formula _ST---pumping station operation efficient, %;

Q---water pump operation flow, m ³/ s;

H _ST---pumping plant lift, m;

ρ---the density of pumping plant institute pumps water, ρ=1000kg/m ³

G---acceleration of gravity, m/s ²

The shaft power of P---water pump operation, kW;

P _m---be the rated power of water auxiliary motor, kW.

The calculating formula of water pump operation flow Q and shaft power is respectively in the formula (1)

$Q=\frac{-B_H\±\sqrt{B_H^2-4(A_H-S)(C_H-H_{\mathrm{sy}})}}{2(A_H-S)}---\left(2\right)$

P＝A _PQ ²+B _PQ+C _P (3)

A in last two formulas _H, B _H, C _H, A _P, B _P, C _P---be respectively fitting coefficient, depend on the performance of water pump itself;

H _Sy---pumping plant lift, m.

The beneficial effect of patent of the present invention is, according to pumping plant present situation ruuning situation, calculate the pumping plant operational efficiency, find problem and the inefficient main cause of pumping station operation that pumping station operation exists, find the key link of pumping plant technological transformation, instruct pumping plant to undergo technological transformation, make the pumping plant technological transformation reach optimum efficiency, technological transformation has important effect to pumping plant.

4. embodiment

Below in conjunction with implementing patent of the present invention is further specified.

Performance parameter according to water pump in the pumping plant calculates fitting coefficient A _H, B _H, C _H, A _P, B _P, C _P, can calculate the flow Q and the shaft power P of water pump operation respectively by formula (2) and formula (3).With flow Q, shaft power P, pumping plant lift H _ST, pumping plant lift H _SyRated power P with auxiliary motor _mIn substitution formula (1), can calculate efficiency of pumping station, the pumping station operation efficient that (SL255-2000) requires with " pumping plant technical management rules " compares then, promptly " the device lift more than 3m large and medium-sized axial flow pumping plant and the unit efficiency of mixed flow pumping plant should not be lower than 65%; The pumping plant that the device lift is lower than 3m should not be lower than 55%; When centrifugal pump station was taken out clear water, its unit efficiency should not be lower than 60%; When taking out muddy water (silt carrying flow), its unit efficiency should not be lower than 55% ", when being lower than above-mentioned numerical value, efficiency of pumping station needs undergo technological transformation to pumping plant.

But through type (1) is further found problem and the inefficient main cause of pumping station operation that pumping station operation exists, finds the key link of pumping plant technological transformation, makes the effect of pumping plant technological transformation reach best.

Claims (1)

1. pumping plant technological transformation mathematical model is characterized in that: by the density p of water, and gravity acceleration g, pump capacity Q, pumping plant lift H _ST, pump shaft power P, motor rated power P _mEtc. formation.