CN110390430A - A kind of frequency conversion type water circulating pump optimizing operation method avoiding frequent start-stop - Google Patents
A kind of frequency conversion type water circulating pump optimizing operation method avoiding frequent start-stop Download PDFInfo
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- 238000005457 optimization Methods 0.000 claims abstract description 29
- 239000013535 sea water Substances 0.000 claims abstract description 26
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Abstract
The invention discloses a kind of frequency conversion type water circulating pump optimizing operation methods for avoiding frequent start-stop, comprising steps of 1) taking the sea level fluctuations of system of sea cooling water is the annual sea level fluctuations of history meteorological data statistics, seawater water temperature is each monthly average seawater water temperature of history meteorological data statistics, carries out the calculating of the key profit points such as frequency conversion type water circulating pump operation number of units variation；2) when unit is run in the unit load variation range that may face, the equal key profit points of frequency conversion type water circulating pump optimization operation number of units variation in annual 12 months are determined；3) according to the equal key profit points of the frequency conversion type water circulating pump optimization operation number of units variation determined in current month situation, unit load and step 2), determine that optimal frequency conversion type water circulating pump runs number of units；4) it is calculated according to the optimization that real-time unit load, sea level fluctuations and seawater water temperature carry out water circulating pump revolving speed, determines the revolving speed of optimal frequency conversion type water circulating pump, realize the number of units of frequency conversion type water circulating pump and the optimization operation of revolving speed.
Description
Technical field
The invention belongs to thermal power plant's system of sea cooling water fields, and in particular to a kind of frequency conversion for avoiding frequent start-stop
Formula water circulating pump optimizing operation method.
Background technique
The optimization operation of Cooling Water From Thermal Power Plants system is an important link of reduction unit generation coal consumption, and fire at present
Motor group carries out one of the most potential technological approaches of energy-saving operation.Cooling water system optimization operation is set in given
Under standby parameter and boundary condition, the optimal solution in economy is found in the influence of each factor in research system, that is, determines optimal condenser pressure
Power and corresponding cooling water flow.And optimal condenser pressure and corresponding cooling water flow are by adjusting frequency conversion type recirculated water
The method of operation (operation number of units, revolving speed) Lai Shixian's of pump.System of sea cooling water is a kind of using seawater as the straight of water source
Cooling water system is flowed, running boundary condition includes: unit load, seawater water temperature and sea level fluctuations.By adjusting frequency conversion type in time
The water circulating pump method of operation (operation number of units, revolving speed), it is ensured that under certain unit load, seawater water temperature and sea level fluctuations, coagulate
Vapour device is optimal pressure, realizes the optimization operation of frequency conversion type water circulating pump, to reduction Station Service Electrical-Energy rate, promotes energy conservation drop
Consumption, raising unit economy have great importance.
For being not involved in the fired power generating unit of peaking operation, in the running boundary condition of system of sea cooling water, sea
Water water level is influenced by flood tide and ebb tide, and continually variation by a relatively large margin is had within one day；Seawater water temperature with season then
It has a greater change；Unit load monthly or in long period of time change it is smaller.Therefore cold using traditional seawater direct current
But water system efficiency method carries out the optimization operation of frequency conversion type water circulating pump, due to by larger in the sea level fluctuations short time
The influence of the variation of amplitude easily leads to the frequent variation of the optimal frequency conversion type water circulating pump method of operation (operation number of units, revolving speed).Become
The variation of frequency formula water circulating pump revolving speed is easy to accomplish, but the variation of frequency conversion type water circulating pump operation number of units but need by opening,
Stop the mode of water circulating pump to realize.It frequently opens, stop water circulating pump and not only be easy to cause the damage of equipment, be unfavorable for unit
Safe operation, and the opening of water circulating pump, the process of stopping are also required to the economical operation for expending longer time, being also unfavorable for unit.
Summary of the invention
The technical problems to be solved by the present invention are: for the fired power generating unit for being not involved in peaking operation, to reduce unit hair
For the purpose of electric coal consumption, propose that one kind avoids frequent start-stop, and can practical, effectively instruct the operation platform of frequency conversion type water circulating pump
Number, rotational speed optimization facilitate the economy for promoting unit operation.
The present invention adopts the following technical scheme that realize:
A kind of frequency conversion type water circulating pump optimizing operation method avoiding frequent start-stop, comprising the following steps:
Step 1, take the sea level fluctuations of system of sea cooling water for the annual seawater water of history meteorological data statistics
Position, seawater water temperature are each monthly average seawater water temperature of history meteorological data statistics, carry out frequency conversion type water circulating pump operation number of units and become
The calculating of the key profit points such as change；
Step 2, in the unit load variation range that may be faced when unit is run, frequency conversion in annual 12 months is determined
The equal key profit points of formula water circulating pump optimization operation number of units variation；
Step 3, operation is optimized according to the frequency conversion type water circulating pump determined in current month situation, unit load and step 2
The equal key profit points of number of units variation determine that optimal frequency conversion type water circulating pump runs number of units；
Step 4, under the frequency conversion type water circulating pump operation number of units that step 3 determines, according to real-time unit load, seawater water
The optimization that position and seawater water temperature carry out water circulating pump revolving speed calculates, and determines the revolving speed of optimal frequency conversion type water circulating pump, realizes frequency conversion
The number of units of formula water circulating pump and the optimization operation of revolving speed.
A further improvement of the present invention lies in that during calculating, not considering the real-time change of sea level fluctuations in step 1
Change.
A further improvement of the present invention lies in that waiting key profit points is to make under setting sea level fluctuations, seawater water temperature in step 1
It obtains two kinds of frequency conversion type water circulating pumps and runs the equal unit load value of the net profit power under number of units.
A further improvement of the present invention lies in that the calculation formula of net profit power are as follows:
In formula, Δ P is unit net profit power, kW；PtFor micro- increasing power of unit, kW；PpiFor i-th recirculated water of unit
The power consumption of pump, kW；I=1,2,3 ... n；N is that water circulating pump runs number of units.
A further improvement of the present invention lies in that in step 3, the optimal frequency conversion type water circulating pump operation number of units of each moon will only by
Unit load determines, for being not involved in the fired power generating unit of peaking operation, according to the substantially unit load monthly or in a period of time
Situation determines the operation number of units of the optimal frequency conversion type water circulating pump monthly or in a period of time, and then optimal frequency conversion type is avoided to recycle
Water pump optimization operation number of units is influenced by sea level fluctuations real-time change.
The present invention has following beneficial technical effect:
By applying above method, the present invention can avoid the frequent start-stop of frequency conversion type water circulating pump, meanwhile, the frequency conversion of optimization
Formula water circulating pump operation number of units has also fully considered the influence of sea level fluctuations, seawater water temperature and unit load, and is become by optimization
The revolving speed of frequency formula water circulating pump reacts the influence of sea level fluctuations, seawater water temperature and unit load three's real-time change, realizes frequency conversion
The optimization of formula water circulating pump is run.
Detailed description of the invention
Fig. 1 is the equal key profit points calculating side that system of sea cooling water difference frequency conversion type water circulating pump runs number of units variation
Method.
Fig. 2 is system of sea cooling water frequency conversion type water circulating pump rotational speed optimization method optimizing operation method.
Fig. 3 is system of sea cooling water frequency conversion type water circulating pump optimizing operation method.
Specific embodiment
The present invention will be described in detail below with reference to the accompanying drawings:
As shown in Figure 1, to take sea level fluctuations be annual sea level fluctuations value, seawater water temperature is annual each monthly average seawater water temperature
(such as average sea in January water temperature) inputs unit load initial value (such as 100%), runs number of units side in two kinds of frequency conversion type water circulating pumps
The optimization that water circulating pump revolving speed is carried out under case (such as scheme 1 is two machines three pump, and scheme 2 is two machines four pump), which calculates, (to be optimized to calculate and calculate
Method is as shown in Fig. 2, will introduce below), steam turbine net profit power 1 and net profit power 2 under optimized rotating speed is calculated.
The calculation formula of net profit power are as follows:
In formula: Δ P is unit net profit power, kW；PtFor micro- increasing power of unit, kW；PpiFor i-th recirculated water of unit
The power consumption of pump, kW；I=1,2,3 ... n；N is that water circulating pump runs number of units.
Compare the steam turbine net profit power 1 and net profit power 2 being calculated, such as the two is equal, then the unit load
The equal key profit points under number of units are run for two kinds of frequency conversion type water circulating pumps；Otherwise, by iterating to calculate unit load, make net profit function
Rate 1 and net profit power 2 are equal.The different frequency conversion type water circulating pumps in certain unit system of sea cooling water January run number of units
Equal key profit points be 84%；I.e. in January, when unit load is less than 84%, select two machines three pump follows pump operation number of units, otherwise
Select two machines four pump follows pump operation number of units.According to the algorithm in Fig. 1, annual 12 months frequency conversion type water circulating pumps are calculated to obtain
The equal key profit points under number of units are run, the operation number of units of frequency conversion type water circulating pump can be conveniently optimized and revised.For being not involved in peak regulation fortune
Capable fired power generating unit can determine the change monthly or in a period of time according to the substantially unit load situation monthly or in a period of time
The operation number of units of frequency formula water circulating pump.
The rotational speed optimization method of frequency conversion type water circulating pump is as shown in Figure 2.When the operation number of units of frequency conversion type water circulating pump determines
After, according to real-time unit load, seawater water temperature and sea level fluctuations, in water circulating pump minimum speed nminTo rated speed nr
In range, it is sequentially increased water circulating pump revolving speed, and the calculating of system of sea cooling water Study on Variable Condition Features is carried out to each revolving speed, it should
Variable condition calculation includes condenser thermodynamic computing, and the micro- increasing power calculation of steam turbine, water circulating pump wasted work calculates and net profit power
It calculates.According to the system of sea cooling water Study on Variable Condition Features calculated result under each water circulating pump revolving speed, seawater direct current is carried out
Cooling water system optimization operation calculates, preferably the optimal water circulating pump revolving speed under the conditions of current border and maximum net profit function out
Rate.
The optimization operational process of complete frequency conversion type water circulating pump is as shown in Figure 3.I.e. according to unit load and the current moon
Part situation determines the operation number of units of optimal frequency conversion type water circulating pump；Negative according to real-time sea level fluctuations, seawater water temperature and unit
Lotus determines the revolving speed of optimal frequency conversion type water circulating pump, realizes the optimization operation of frequency conversion type water circulating pump.
Application effect:
The optimization operation calculated result of the frequency conversion type water circulating pump of certain power plant shows: in terms of annual economic well-being of workers and staff, this hair
The method that bright patent proposes can reach real-time optimization frequency conversion type water circulating pump number of units, revolving speed method about 90%.But it is of the invention
The method that patent proposes is not necessarily to frequent start-stop water circulating pump, is conducive to the safe operation of unit.
Claims (5)
1. a kind of frequency conversion type water circulating pump optimizing operation method for avoiding frequent start-stop, which comprises the following steps:
Step 1, take the sea level fluctuations of system of sea cooling water for the annual sea level fluctuations of history meteorological data statistics, sea
Water water temperature is each monthly average seawater water temperature of history meteorological data statistics, and it is equivalent to carry out the operation number of units variation of frequency conversion type water circulating pump
The calculating of benefit point；
Step 2, in the unit load variation range that may be faced when unit is run, determine that annual 12 months frequency conversion types follow
The equal key profit points of ring water pump optimization operation number of units variation；
Step 3, according to the frequency conversion type water circulating pump optimization operation number of units determined in current month situation, unit load and step 2
The equal key profit points of variation determine optimal frequency conversion type water circulating pump operation number of units；
Step 4, step 3 determine frequency conversion type water circulating pump operation number of units under, according to real-time unit load, sea level fluctuations and
The optimization that seawater water temperature carries out water circulating pump revolving speed calculates, and determines the revolving speed of optimal frequency conversion type water circulating pump, realizes that frequency conversion type follows
The number of units of ring water pump and the optimization operation of revolving speed.
2. a kind of frequency conversion type water circulating pump optimizing operation method for avoiding frequent start-stop according to claim 1, feature
It is, in step 1, during calculating, does not consider the real-time change of sea level fluctuations.
3. a kind of frequency conversion type water circulating pump optimizing operation method for avoiding frequent start-stop according to claim 1, feature
It is, in step 1, waiting key profit points is under setting sea level fluctuations, seawater water temperature, so that two kinds of frequency conversion type water circulating pumps run platform
The equal unit load value of net profit power under several.
4. a kind of frequency conversion type water circulating pump optimizing operation method for avoiding frequent start-stop according to claim 3, feature
It is, the calculation formula of net profit power are as follows:
In formula, Δ P is unit net profit power, kW；PtFor micro- increasing power of unit, kW；PpiFor i-th water circulating pump of unit
Power consumption, kW；I=1,2,3 ... n；N is that water circulating pump runs number of units.
5. a kind of frequency conversion type water circulating pump optimizing operation method for avoiding frequent start-stop according to claim 1, feature
It is, in step 3, the optimal frequency conversion type water circulating pump operation number of units of each moon will be determined only by unit load, be adjusted for being not involved in
The fired power generating unit of peak operation, determines monthly or in a period of time according to the substantially unit load situation monthly or in a period of time
The operation number of units of optimal frequency conversion type water circulating pump, and then avoid optimal frequency conversion type water circulating pump optimization operation number of units by sea level fluctuations
The influence of real-time change.
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Cited By (2)
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| CN112228329A (en) * | 2020-10-22 | 2021-01-15 | 西安热工研究院有限公司 | System, device and method for automatically optimizing and adjusting running frequency of circulating water pump |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112228329A (en) * | 2020-10-22 | 2021-01-15 | 西安热工研究院有限公司 | System, device and method for automatically optimizing and adjusting running frequency of circulating water pump |
| CN112163723A (en) * | 2020-11-02 | 2021-01-01 | 西安热工研究院有限公司 | Hydropower station medium and long term runoff prediction method, medium and equipment based on scenario division |
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