CN1112695A - Computer optimization control for compressed water pump station - Google Patents

Abstract

The present invention relates to a method for controlling pumping station of waterworks by using computer programme, in particular, it is an optimized controlling method for pumping station. According to the corelated factors fed back by sensor, said method uses a computer to analyze the obtained hourly water rate data base of the corelated area, and then regulates the rotating speed or frequency of variable speed pump according to the hourly water requirement and hourly water pressure of the variable speed pump. Said optimized controlling method can meet the requirements of user for water demand and water pressure, and can reduce electric consumption in the cost for making up water, and the electric consumption can be evenly reduced by 5-15%.

Description

The Computer Optimizing Control of pump works

The present invention relates to a kind of method that adopts the operation of computer program control pump works, the optimal control of particularly a kind of water pump constant speed and variable-speed operation.

In the former water and the water treatment plant of urban water supply, waste water and sewage treatment plant do not have pump works usually, and pumping plant generally has fixed this in parallelly with velocity fluctuation pump to move work simultaneously.China water factory pumping plant design at present is to adopt platform numerical control system mode with operation basically, according to the user to the water yield and hydraulic pressure needs, by rule of thumb water pump is divided into secondary or three grades and send water, be divided into secondary in just one day or change water pump operation platform number for three times, make pushing quantity and water pressure energy require this kind control mode the simplest near the user, cost of equipment is little, but this control mode pressure changes greatly, and flow and pressure can not be realized stepless control.Sometimes it is a lot of less than the actual delivery head of water pump trunking loss to occur, causes power consumption too high; Sometimes the actual delivery head of water pump also may occur less than the pipeline loss of flood peak, then not satisfy the needs of user the hydraulic pressure and the water yield.In some middle-size and small-size water treatment plants, the employing valve opening extent control mode that also has, this kind control mode pump efficiency is the poorest, should not adopt, at present external water treatment plant pumping plant seldom adopts this control mode, and the top hole pressure weighing apparatus is decided control mode, the trunking loss that is applicable to the user is smaller, the user allows variation in water pressure, and user's water requirement is little, changes also less water supply conditions.This control mode need adopt the speed governing automatic control system, just can make the constant pressure that dispatches from the factory, only count mode than the front by opening the water pump platform, can reduce power consumption, can be near the needs of user, when preposition pond or water tower are arranged to the water yield and hydraulic pressure, also adopt the constant control mode of pond or water tower level, this kind control mode, more in some water treatment plant of developed country pumping plant control application, and practicality is arranged.China is owing to most of urban water shortage, and water treatment plant's pond capacity is less, is difficult to realize this control mode.The control of pipe network end (slightly) constant pressure is applicable to the big city of pipe network loss, and this kind control mode need adopt the speed governing automatic control system, realizes end constant pressure slightly.This kind control mode can satisfy the needs of user to the water yield and hydraulic pressure, can better reduce power consumption, but need hydraulic pressure sensor to have telecommunication, remote continuous detecting hydraulic pressure, in time delivers to the water purification pumping plant, so that realize the speed governing FEEDBACK CONTROL.Water treatment plant's pumping plant that at present more external developed countries have adopts this automatic control mode.The most of city of China is because water yield imbalance between supply and demand is bigger, and the remote measurement reliability of remote hydraulic pressure sensor is relatively poor in addition, is difficult to realize this kind control mode.The Computer Optimizing Control of pump works is a patent of invention, through the data retrieval of DIALOG system, checks digest, and not finding has the document identical with content of the present invention in the world, detects 0 piece of associated documents in the domestic Chinese database.

The purpose of this invention is to provide a kind of method that adopts the operation of computer program control pump works, the platform number that makes the constant speed pump speed-variable pump with and running parameter reach optimization control, satisfying the requirement while of user to the hydraulic pressure and the water yield, reduce power consumption, reduce water producing cost.

The Computer Optimizing Control of pump works is the correlative factor that arrives according to sensor feedback, analyzes the per hour utility rate of water database that obtains the relevant range, and computing machine is according to the per hour needed pushing quantity Q of speed-variable pump _Become, and speed-variable pump by the time required send bigcatkin willow to press H, determine the frequency rotating speed of speed-variable pump, as shown in Figure 1.Computer-controlled program is as follows;

(1). system begins to import speed-variable pump and the constant speed pump maximum pushing quantity in efficient district's work, and they are:

d ₁～d ₂；d ₃～d ₄；d ₅～d ₆；d ₇～d ₈；

d ₉～d ₁₀；d ₁₁～d ₁₂。

(2). the correlative factor that computing machine arrives according to sensor feedback, analyze the per hour utility rate of water X database that obtains the relevant range; If every day, pushing quantity was Q, pushing quantity Q in the time of can obtaining pursuing _i=XQ.

(3). judge pushing quantity Q when pursuing _iWhether belong to d ₁～d ₂The interval is if satisfy d ₁～d ₂The interval then is 2 speed-variable pump operations, and every speed-variable pump pushing quantity is If Q _iDo not satisfy d ₁～d ₂Q is then continued to judge in the interval _iWhether satisfy Q _i＜d _iIf satisfy Q _i＜d _i, then be 1 speed-variable pump operation, pushing quantity Q _Become=Q _iIf, Q _iDo not satisfy Q _i＜d _i, then carry out next step,

(4). according to pipe system performance curve formula H _i=H _o+ KQ ² _iSend water hydraulic pressure H when (1) obtaining pursuing _i, K-coefficient, H _o--user's pressure head is provided.

(5). the constant speed pump family curve of input computing machine is asked constant speed pump flow Q _Fixed

(6). computing machine is during according to many constant speed water pumps and two velocity fluctuation pump parallel runnings, by the time pushing quantity Q _i=YQ _Fixed+ 2Q _BecomeRelation, determine speed-variable pump by the time required pushing quantity

Work as Q _iAt (d ₃～d ₄) time, Y=1

Work as Q _iAt (d ₅～d ₆) time, Y=2

Work as Q _iAt (d ₇～d ₈) time, Y=3

Work as Q _iAt (d ₉～d ₁₀) time, Y=4

Work as Q _iAt (d ₁₁～d ₁₂) time, Y=5

Work as Q _iNot at (d ₁₁～d ₁₂) time, system alarm also returns, Y one constant speed pump platform number.

(7). computing machine is according to functional expression n=F (Q _Become, H _Become) (8) relation, and by the water requirement Q of speed-variable pump institute that selects previously _BecomeWith speed-variable pump hydraulic pressure H _Become, draw the required rotation speed n of speed-variable pump.

(8). the required rotation speed n of speed-variable pump is outputed on the speed-variable pump,, satisfy the purpose of pipe network requirement to reach the adjustment water yield.

In above job step, actual be with Computer Analysis obtain by the time pushing quantity Q _iCompare with the pushing quantity scope of having set, and finally obtain the water requirement Q of speed-variable pump institute _Become, can be divided into six zones for the pushing quantity territory of setting, and water consumption increases progressively and is d ₁＜d ₂＜d ₃＜d ₁₂, when pursuing hourly water consumption Q _i＜d ₁The time, open a speed-variable pump and satisfy pushing quantity Q when pursuing _iWhen pushing quantity increases when pursuing, Q _iSatisfy d ₁～d ₂The interval, open two speed-variable pumps and satisfy Q this moment _iWhen pushing quantity further increases when pursuing, Q _i＞d ₂, increase speed-variable pump this moment again is uneconomic, can increase the water yield with the increase constant speed pump, and then adjusts output by speed-variable pump.Just adopt with constant speed pump and control macroscopical water yield, exceed d if finely tune water yield system with two speed-variable pumps ₁₁～d ₁₂The interval, promptly 5 constant speed pumps and two speed-variable pumps start simultaneously and can not satisfy water yield requirement, and system thinks that this is an impossible event, must be the system failure if this occurs, then returns and reports to the police.The working control step is performed such.Send water hydraulic pressure H when specifically obtaining pursuing according to the pipe system performance curve formula _i, computing machine is according to known H _iConstant speed pump family curve with the input computing machine obtains constant speed pump flow Q _FixedComputing machine is during according to many constant speed water pumps and two velocity fluctuation pump parallel runnings, by the time pushing quantity Q _i=YQ _Fixed+ 2Q _BecomeRelation, determine the required pushing quantity of speed-variable pump

Pushing quantity Q when basis is pursued again _iSize, computing machine just can determine that the platform of constant speed pump counts Y.Calculate required pushing quantity Q _Become, delivery head H _p, just can pump rotary speed be changed, to satisfy the requirement of required pushing quantity and lift by changing electric machine frequency.

Fig. 1 is the flow chart of computer program control water factory pumping plant;

Fig. 2 is the family curve and the characteristic curve of pipeline figure of water pump;

Fig. 3 is the pump speed control curve map.

1. the best governor impeller platform number in many water pump parallel runnings

Water pump is many parallel connection of pumps work often in actual motion, if the platform number by the start-stop pump to be to regulate flow, operating point can not change continuously, cause energy dissipation very big.After adopting pump speed control, select the scheme of governor impeller and constant speed pump parallel running often, utilization is opened, and stops constant speed pump platform number and carries out coarse adjustment, utilizes speed-variable pump to carry out fine tuning.Do you so how determine the platform number of governor impeller? full accent is fine certainly, but because the arrangements for speed regulation price is very expensive at present, and arrangements for speed regulation itself also will consume energy, and individual economic problems are also arranged in addition, so unrealistic, there is not this necessity yet.Be illustrated below by analyzing water pump parallel running process.As can be seen from Figure 2, as flow Q=Q _AThe time, can open two pumps, work as Q=Q _BThe time, can open three pumps.But work as Q=Q _x(Q _A＜Q _x＜Q _B) time, under the situation of no governor impeller, must drive three pumps, this moment operating point will on move to the C point, and make the head that offers the user from H _STRise to H _ST, caused energy dissipation.After adopting governor impeller, then, make operating point drop to the X point, thereby save unnecessary head from the C point by reducing the revolution of governor impeller.If only adopt a governor impeller, then flow q ' _TProvide by constant speed pump, and flow q ' _xThen provide by governor impeller.If single from regulating the angle of flow, governor impeller fully can, but the purpose of pump speed control is for energy-conservation.Because the operating point of pipe network is arbitrarily, that is to say Q _xCan be Q _AWith Q _BBetween arbitrary numerical value, work as Q _xUnlimited near Q _AThe time, the aquifer yield q of governor impeller then _xTo approach zero, its efficient is extremely low, causes energy dissipation on the contrary, therefore depends merely on a pump speed governing and does not reach the expection energy-saving effect.What if? the way that solves adopts the two pumps speed governing exactly, as shown in Figure 2, works as Q=Q _x(Q _A＜Q _x＜Q _B) time open a constant speed pump and two governor impellers, this moment, constant speed pump provided flow q _T, and two governor impellers provide flow q jointly _x, then the separate unit governor impeller is

When flow reduces to Q≤Q _AThe time, cut off a constant speed pump this moment, supply water by two governor impellers; As flow Q＞Q _BThe time, then open a constant speed pump again.The rest may be inferred, and two governor impellers are in operating condition always, obviously according to this method of operation, and the output q of governor impeller _xTo change between the output less than two constant speed pumps greater than the output of a constant speed pump, thereby guarantee that governor impeller is in the work of efficient district in the speed governing running, reach purpose of energy saving always.Adopt the two pumps speed governing in addition, the speed adjustable range of single pump is dwindled, to the requirement condition reduction of arrangements for speed regulation.Can governor impeller be considered standby? at present because arrangements for speed regulation, particularly RHVC costs an arm and a leg, and therefore need not consider standbyly, when arrangements for speed regulation are out of order, can change constant speed drive into, or enable standby constant speed pump.Though can cause energy dissipation this moment, always than standby expensive arrangements for speed regulation, it is worthwhile to leave unused at ordinary times.The governor impeller that surpasses more than two is set be there is no need, when governor impeller was above above two, then the speed adjustable range of separate unit governor impeller was very little, and arrangements for speed regulation itself also have an efficiency in addition, energy-saving effect also may not be certain, so the best speed governing platform number of water pump is two.

2. the maximum speed adjustable range of governor impeller in many water pump parallel runnings

The maximum speed adjustable range of governor impeller is exactly governor impeller required speed ratio when running to the least favorable situation, and downward modulation is generally adopted in the speed governing of water pump.As shown in Figure 3, as flow Q＞Q _sThe time, two governor impellers all put into operation, as flow Q≤Q _sThe time, can adopt a governor impeller job.When water pump operation arrives Q=Q _sThe time, governor impeller situation least favorable, speed adjustable range maximum.This moment, the aquifer yield of separate unit governor impeller was

Its lift is H _s, i.e. B point among the figure.According to the flow and the lift of this point, ask the similar parabolical K value of its operating mode, that is: $K=\frac{H_s}{{\left(\frac{Q_s}{2}\right)}^2}=\frac{{4H}_s}{{Q_s}^2}---\left(9\right)$ $H={\mathrm{<figure-callout\; id="2"\; label="KQ"\; filenames="9510272600241.png"\; state="\{\{state\}\}">KQ</figure-callout>}}^2=\frac{{4H}_s}{{Q_s}^2}\&CenterDot;Q^2---\left(10\right)$ This para-curve point is painted on the figure, obtains itself and governor impeller at rated revolution n _oThe time the intersection point C (Q of pump characteristic _c, H _c), then this is the operating mode similitude with the B point, the maximum speed adjustable range (downward modulation velocity ratio) that can try to achieve adjustable speed water pump according to flow or the Yang Cheng of 2 of B, C: $K_n=\frac{Q_s/2}{Q_c}=\frac{Q_s}{2Q_c}---\left(11\right)$ $K_n=\sqrt{\frac{H_s}{H_c}}---\left(12\right)$ As minimum flow Q _MinLess than half of single pump aquifer yield, promptly $Q_{\min }<\frac{Q_s}{2}$ The time, then will be with Q _MinAnd H _MinReplace above-mentioned B point to ask maximum speed ratio.In actual design, consider that pump sump well water position changes and the dirigibility of control, speed adjustable range can suitably relax to 5～10% on the calculating basis, and the speed adjustable range of general water pump is 80～100%.

3. pump works constant speed pump and speed-variable pump running parameter determines

Realize the pumping plant optimal control, rationally determine constant speed pump and speed-variable pump worktable number its operating condition to be changed continuously, satisfy the requirement of user, and make various water pump efficiency height, reach and reduce the power consumption purpose the hydraulic pressure and the water yield.Decision water pump operation major parameter is dispatch from the factory flow and a hydraulic pressure of water treatment plant, distant place user's pressure control point pressure, water treatment plant's clear water reserviors water level etc.Want to realize that the optimal control of this multiparameter is difficult, need set up some control criterion, make challenge obtain simplifying, thereby be optimized mathematics of control model, so that realize the purpose of optimal control in producing to constant speed pump and speed-variable pump.

1) the continuous operating condition of constant speed pump and speed-variable pump should satisfy the requirement of each user to the water yield and hydraulic pressure, and can reduce power consumption.

2) determine this water treatment plant water supply coverage least favorable reference mark,, just can satisfy the needs of each user of this water factory's water supply coverage the water yield and hydraulic pressure as long as that is to say and satisfy this reference mark hydraulic pressure requirement.

3) satisfying under the condition of least favorable reference mark to the hydraulic pressure requirement, drawing the per hour water curve of city or this area.

4) we think that water treatment plant's water-purifying process per hour handles the water yield and change very for a short time, can be considered as invariablely, and so per hour the water purification amount is a whole day water purification amount 4.17%.

5), check the clear water reserviors volume of actual needs according to front water curve and raw water pump station pushing quantity 4.17% per hour per hour.If actual needed clear water reserviors volume is less than or equal to design clear water reserviors volume, we we can say that the clear water reserviors SEA LEVEL VARIATION satisfies the optimal control needs.

6) determining of constant speed water pump velocity fluctuation pump worktable number, with and the mutual relationship of pushing quantity and water consumption

When a, a velocity fluctuation pump job, it is pushing quantity Q per hour _Become, equal per hour water consumption Q _i: Q _Become=Q _i

B, when the work of two velocity fluctuation pumps, establishing every velocity fluctuation pump pushing quantity is Q _Become, per hour water consumption is Q _i, then have: 2Q _Become=Q _i

C, when a constant speed water pump and two velocity fluctuation pump parallel runnings, setting the fast pumping water yield is Q _Fixed, then have: Q _Fixed+ 2Q _Become=Q _i

D, when two constant speed water pumps and two velocity fluctuation pump parallel runnings, then have: 2Q _Fixed+ 2Q _Become=Q _i

E, when many constant speed water pumps are in parallel with two velocity fluctuation pumps, setting fast water pump platform number is the Y platform, then has: YQ _Fixed+ 2Q _Become=Q _i

7) make pipe system performance curve, and write out and describe its family curve formula:

H＝H _o+KQ _i ²

Here Q _iBe that the water purification pumping plant per hour send the water water yield, per hour need should equal water consumption.

8) obtain the pipeline characteristic curve equation according to pipe network adjustment and actual production test, so just can calculate required water hydraulic pressure: the H that send of this hour according to per hour needing water consumption _i=H _o+ KQ _i ²

Here H _PiBe exactly that this pumping plant send water required pressure when satisfying, its constant H _oCan try to achieve with the mathematical statistics method by producing experiment with COEFFICIENT K.

9) we use water pushing pressure H when satisfying _Pi,, can get every constant speed water pump pushing quantity Q by the constant speed pump characteristic _FixedNot rare like this velocity fluctuation pump pushing quantity: 2Q _Become=Q _i-YQ _Fixed

10) the known pump of internal speed-changing sometime platform number, pushing quantity Q _Become, delivery head H _p, just obtain its moving law requirement.Want to realize requirement, can pump rotary speed be changed by changing electric machine frequency, pump rotary speed changes can reach speed-variable pump to sending the requirement of discharge and lift.In working control, can pass through feedback controling mode, change above-mentioned operational factor, reach the required requirement of sending discharge and lift.

The present invention according to the user to the water yield and pressure, the water yield of output water and hydraulic pressure, parameters such as the water level of reservoir, promptly and accurately quantitative Analysis goes out the flow and the pressure of required water supply, and definite constant speed pump and speed-variable pump worktable number, and the running parameter of governor impeller, to the operation realization optimal control of water pump.Thereby avoided hydraulic pressure to cross when low, the user that the pipe network end has does not have water, the perhaps too high generation pipe network of hydraulic pressure booster, and economic loss has been retrieved in the generation that need cut off the water and repair.Guaranteeing under the prerequisite of user to the water yield and hydraulic pressure needs, can reduce the power consumption in the water producing cost, average power consumption and 5%～15% of the total electrisity consumption of reducing, the present invention has realized automatic control, has improved the management quality and the work efficiency of water factory, alleviated operating personnel's working strength simultaneously, another feature of the present invention is to break the normal procedure, and at first starts speed-variable pump and carries out water yield control, rather than start constant speed pump earlier, and when having determined that speed-variable pump platform number is one or two, energy-saving effect is best; Restart on this basis and decide the fortune pump, the water yield of pipe network is carried out macroscopical water yield regulate and control, accept feedback information with speed-variable pump the pipe network water yield is carried out the microcosmic regulation and control to transport pump surely.

Embodiment:

The newly-built water purification pumping plant of Harbin City Sha Mantun water factory, designed capacity is 450,000 m ³/ d is provided with seven water pumps altogether, four constant speed pumps wherein, and three usefulness one are equipped with; Three become the fortune pump, and dual-purpose one is equipped with.First phase output Q=25 ten thousand m ³/ d obtains 0～24 hour the x of utility rate of water at any time of Harbin City according to parameters such as the water level of dispatch from the factory flow and the lift of this pumping plant, clear water reserviors, ductwork pressures, x numerical value input computing machine.According to day pushing quantity Q=25m ³/ d, pushing quantity Q in the time of can obtaining pursuing _i=XQ also imports computing machine.Constant speed pump family curve (according to the design sample of water pump), and efficiently distinguish working range according to this constant speed pump and speed-variable pump and determine (d ₁, d ₂), (d ₃, d ₄), (d ₅, d ₆) be respectively (3900,7800), (7850,11200), (11210,15000).Simultaneously also pipe system performance curve H=H _o+ KQ _iThe input computing machine so just can adopt computing machine to control speed-variable pump and constant speed pump worktable number at any time from 0 o'clock to 24 o'clock, with and the lift of working and pushing quantity separately, now do following introduction.

(1) when 0～1, send water rate x=3.0%, needing pushing quantity is Q _i=7725m ³/ h, then pushing quantity Q at this moment _iIn (3900,7800) interval, should be two speed-variable pump parallel running operations, every speed-variable pump pushing quantity

Can the speed-variable pump rotating speed also be changed accordingly by changing electric machine frequency constantly at this, finally reach the speed-variable pump pushing quantity and do corresponding variation (can pass through control hardware, adopt approximatioss realization gradually).

(2) when 1～2, send water rate X=3.03%, required pushing quantity is Q _i=7525m ³/ h.At this moment pushing quantity Q _iIn (3900,7800) interval, should be two speed-variable pump parallel running operations, every speed-variable pump pushing quantity is Q _Become==3763m ³/ h.According to control mode in (1), finally reach the requirement of required pushing quantity then.

(3) when 2～3, send water rate X=3.15%, needing pushing quantity is Q _i=7875m ³/ h.At this moment pushing quantity Q _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ _i ², delivery head H in the time of can obtaining this _i=48.29m.Then according to constant speed pumps water family curve, known should the time delivery head 48.29m, can obtain the pushing quantity Q of constant speed pump _Fixed=3900m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach the requirement of required pushing quantity with control mode in (1) below

(4) when 3～4, send water rate x=3.20%, need pushing quantity Q _i=8000m ³/ h, pushing quantity Q at this moment _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ ² _i, delivery head H in the time of can obtaining this _i=48.35m.Then according to constant speed pumps water family curve, known should the time delivery head 48.35m, can obtain the pushing quantity Q of constant speed pump _Fixed=3850m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach the requirement of required pushing quantity with control mode in (1) below

(5) when 4～5, send water rate x=3.31%, need pushing quantity Q _i=8275m ³/ h, pushing quantity at this moment should be two speed-variable pumps and a constant speed pump parallel running in (7850,11200) interval.According to H _i=H _o+ KQ _i ², delivery head H in the time of can obtaining this _i=48.64m.Send the water family curve according to the constant speed pump conveying pump then, known should the time delivery head 48.64m, can obtain constant speed pump water yield Q _Fixed=3810m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach the requirement of required pushing quantity with control mode in (1) below.

(6) when 5～6, send water rate x=3.78%, needed pushing quantity Q _i=9450m ³/ h.At this moment pushing quantity Q _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ ² _i, delivery head H in the time of can obtaining this _i=49.96m.And then according to constant speed pumps water family curve, known this time send water journey 49.96m, can obtain constant speed pump pushing quantity Q _Fixed=3750m ³/ h just can obtain every speed-variable pump pushing quantity like this

Can finally reach the requirement of required pushing quantity with control mode in (1) below.

(7) when 6～7, send water rate X=4.96%, needed pushing quantity Q _i=12400m ³/ h.At this moment pushing quantity Q _iIn (11210,15000) interval, should be two speed-variable pumps and two constant speed pump parallel runnings.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=54.02m.And then according to constant speed pumps water family curve, known should the time delivery head 54.02m, can obtain constant speed pump pushing quantity Q _Fixed=3300m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach the requirement of required pushing quantity with control mode in (1) below.

(8) when 7～8, send water rate X=5.18%, needed pushing quantity Q _i=12950m ³/ h.At this moment pushing quantity Q _iIn (11210,15000) interval, should be two speed-variable pumps and two constant speed pump parallel runnings.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=54.92m.And then according to constant speed pumps water family curve, known should the time delivery head 54.92m, can obtain constant speed pump pushing quantity Q _Fixed=3250m ³/ h so just can obtain every speed-variable pump pushing quantity

Can finally reach the requirement of required pushing quantity with control mode in (1) below

(9) when 8～9, send water rate X=4.98%, needed pushing quantity Q _i=12450m ³/ h.At this moment pushing quantity Q _iIn (11210,15000) interval, should be two speed-variable pumps and two constant speed pump parallel runnings.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=54.12m.And then according to constant speed pumps water family curve, known should the time delivery head 54.12m, can obtain constant speed pump pushing quantity Q _Fixed=3290m ³/ h so just can obtain every speed-variable pump pushing quantity

Can finally reach needed requirement with control mode in (1) below.

(10) when 9～10, send water rate X=4.71%, needed pushing quantity Q _i=11775m ³/ h.At this moment pushing quantity Q _iIn (11210,15000) interval, should be two speed-variable pumps and two constant speed pump parallel runnings.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=53.08m.And then according to constant speed pumps water family curve, known should the time delivery head 53.08m, can obtain constant speed pump pushing quantity Q _Fixed=3550m ³/ h.So just can obtain every speed-variable pump pushing quantity Can finally reach needed requirement with control mode in (1) below.

(11) when 10～11, send water rate X=4.04%, needed pushing quantity Q _i=10100m ³/ h.At this moment pushing quantity Q _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=52.82m.And then according to constant speed pumps water family curve, known should the time delivery head 52.82m, can obtain constant speed pump pushing quantity Q _Fixed=3580m ³/ h.So just can obtain every speed-variable pump pushing quantity Can finally reach needed requirement with control mode in (1) below.

(12) when 11～12, send water rate X=4.41%, needed pushing quantity Q _i=11025m ³/ h.At this moment pushing quantity Q _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=52.00m.And then according to constant speed pumps water family curve, known should the time delivery head 52.00m, can obtain constant speed pump pushing quantity Q _Fixed=3700m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach needed requirement with control mode in (1) below.

(13) when 12～13, send water rate X=4.34%, needed pushing quantity Q _i=10850m ³/ h.At this moment pushing quantity Q _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=51.72m.And then according to constant speed pumps water family curve, known should the time delivery head 51.72m, can obtain constant speed pump pushing quantity Q _Fixed=3720m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach needed requirement with control mode in (1) below.

(14) when 13～14, send water rate X=4.36%, needed pushing quantity Q _i=10900m ³/ h.At this moment pushing quantity Q _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=51.83m.And then according to constant speed pumps water family curve, known should the time delivery head 51.83m, can obtain constant speed pump pushing quantity Q _Fixed=3710m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach needed requirement with control mode in (1) below.

(15) when 14～15, send water rate X=4.35%, needed pushing quantity Q _i=10875m ³/ h.At this moment pushing quantity Q _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=51.79m.And then according to constant speed pumps water family curve, known should the time delivery head 51.79m, can obtain constant speed pump pushing quantity Q _Fixed=3715m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach needed requirement with control mode in (1) below.

(16) when 15～16, send water rate X=4.49%, needed pushing quantity Q _i=11225m ³/ h.At this moment pushing quantity Q _iIn (11210,15000) interval, should be two speed-variable pumps and two constant speed pump parallel runnings.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=52.28m.And then according to constant speed pumps water family curve, known should the time delivery head 52.28m, can obtain constant speed pump pushing quantity Q _Fixed=3650m ³/ h.So just can obtain every speed-variable pump pushing quantity Can finally reach needed requirement with control mode in (1) below.

(17) when 16～17, send water rate X=5.15%, needed pushing quantity Q _i=12875m ³/ h.At this moment pushing quantity Q _iIn (11210,15000) interval, should be two speed-variable pumps and two constant speed pump parallel runnings.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=54.80m.And then according to constant speed pumps water family curve, known should the time delivery head 54.80m, can obtain constant speed pump pushing quantity Q _Fixed=3250m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach needed requirement with control mode in (1) below.

(18) when 17～18, send water rate X=4.90%, needed pushing quantity Q _i=12250m ³/ h.At this moment pushing quantity Q _iIn (11210,15000) interval, should be two speed-variable pumps and two constant speed pump parallel runnings.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=53.81m.And then according to constant speed pumps water family curve, known should the time delivery head 53.81m, can obtain constant speed pump pushing quantity Q _Fixed=3400m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach needed requirement with control mode in (1) below.

(19) when 18～19, send water rate X=4.80%, needed pushing quantity Q _i=12000m ³/ h.At this moment pushing quantity Q _iIn (11210,15000) interval, should be two speed-variable pumps and two constant speed pump parallel runnings.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=53.42m.And then according to constant speed pumps water family curve, known should the time delivery head 53.42m, can obtain constant speed pump pushing quantity Q _Fixed=3450m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach needed requirement with control mode in (1) below.

(20) when 19～20, send water rate X=4.56%, needed pushing quantity Q _i=11400m ³/ h.At this moment pushing quantity Q _iIn (11210,15000) interval, should be two speed-variable pumps and two constant speed pump parallel runnings.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=52.53m.And then according to constant speed pumps water family curve, known should the time delivery head 52.53m, can obtain constant speed pump pushing quantity Q _Fixed=3590m ³/ h.So just can obtain every speed-variable pump pushing quantity Can finally reach needed requirement with control mode in (1) below.

(21) when 20～21, send water rate X=4.18%, needed pushing quantity Q _i=10450m ³/ h.At this moment pushing quantity Q _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=51.29m.And then according to constant speed pumps water family curve, known should the time delivery head 51.29m, can obtain constant speed pump pushing quantity Q _Fixed=3750m ³/ h.So just can obtain every speed-variable pump pushing quantity

Can finally reach needed requirement with control mode in (1) below.

(22) when 21～22, send water rate X=4.04%, needed pushing quantity Q _i=10100m ³/ h.At this moment pushing quantity Q _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=50.76m.And then according to constant speed pumps water family curve, known should the time delivery head 50.76m, can obtain constant speed pump pushing quantity Q _Fixed=3790m ³/ h.So just can obtain every speed-variable pump pushing quantity Can finally reach needed requirement with control mode in (1) below.

(23) when 22～23, send water rate X=3.35%, needed pushing quantity Q _i=8375m ³/ h.At this moment pushing quantity Q _iIn (7850,11200) interval, should be two speed-variable pumps and a constant speed pump parallel running.According to H _i=H _o+ KQ ² _iDelivery head H in the time of can obtaining this _i=49.71m.And then according to constant speed pumps water family curve, known should the time delivery head 49.71m, can obtain constant speed pump pushing quantity Q _Fixed=3800m ³/ h.So just can obtain every speed-variable pump pushing quantity Can finally reach needed requirement with control mode in (1) below.

(24) when 23～24, send water rate X=3.04%, needed pushing quantity Q _i=7600m ³/ h.At this moment pushing quantity Q _iIn (3900,7800) interval, should be two speed-variable pump parallel runnings, every speed-variable pump water yield

Can finally reach needed requirement with control mode in (1) below.

Claims (2)

1, the Computer Optimizing Control of pump works is the correlative factor that arrives according to sensor feedback, analyzes the per hour utility rate of water database that obtains the relevant range, and computing machine is according to the per hour needed pushing quantity Q of speed-variable pump _Become, and speed-variable pump by the time hydraulic pressure H _BecomeRotating speed or frequency to speed-variable pump are adjusted, and it is characterized in that: computer control mode adopts following controlled step:

(1). system begins to import speed-variable pump and the constant speed pump maximum pushing quantity in efficient district's work, and they are:

d ₁～d ₂；d ₃～d ₄；d ₅～d ₆；

d ₇～d ₈；d ₉～d ₁₀；d ₁₁～d ₁₂。

(2). the correlative factor that computing machine arrives according to sensor feedback, analyze the per hour utility rate of water database obtain the relevant range: establishing the every day pushing quantity is Q, can obtain by the time pushing quantity Q _i=XQ.

(3). judge pushing quantity Q when pursuing _iWhether belong to d ₁～d ₂The interval is if satisfy d ₁～d ₂The interval then is 2 speed-variable pump operations, and every speed-variable pump pushing quantity is If Q _iDo not satisfy d ₁～d ₂Q is then continued to judge in the interval _iWhether satisfy Q _i＜d _iIf satisfy Q _i≤ d _i, Q then _Become=Q _iIf, Q _iDo not satisfy Q _i＜d _i, then carry out next step

(4). according to pipe system performance curve formula H _i=H _o+ KQ ² _iSend water hydraulic pressure H when (1) obtaining pursuing _i, K-coefficient, H _o-user's pressure head is provided.

(5). the constant speed pump family curve of input computing machine is asked constant speed pump flow Q _Become

(6). computing machine is during according to many constant speed water pumps and two velocity fluctuation pump parallel runnings, by the time pushing quantity Q _i=YQ _Fixed+ 2Q _BecomeRelation, determine speed-variable pump by the time required pushing quantity

For under one of situation.

Work as Q _iAt (d ₃～d ₄) time, Y=1

Work as Q _iAt (d ₅～d ₆) time, Y=2

Work as Q _iAt (d ₇～d ₈) time, Y=3

Work as Q _iAt (d ₉～d ₁₀) time, Y=4

Work as Q _iAt (d ₁₁～d ₁₂) time, Y=5

Work as Q _iNot at (d ₁₁～d ₁₂) time, system alarm also returns, Y-constant speed pump platform number.

(7). computing machine is according to functional expression n=F (Q _Become, H _Become) (8) relation, and by the water requirement Q of speed-variable pump institute that selects previously _BecomeWith speed-variable pump hydraulic pressure H _Become, draw the required rotation speed n of speed-variable pump

(8). the required rotation speed n of speed-variable pump is outputed on the speed-variable pump,, satisfy the purpose of pipe network requirement to reach the adjustment water yield.

2, the Computer Optimizing Control of pump works according to claim 1, it is characterized in that: the factor of described sensor feedback is: output water flow, output water pressure, urban district distribution system of water supply pressure, the pressure of urban district distribution system of water supply pressure control point, the clear water reserviors water level and the water yield

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