CN102588010B - Method for estimating throttling frequency-modulation load characteristics of condensed water for thermoelectric generating set - Google Patents
Method for estimating throttling frequency-modulation load characteristics of condensed water for thermoelectric generating set Download PDFInfo
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Abstract
The invention discloses a method for estimating throttling frequency-modulation load characteristics of condensed water for a thermoelectric generating set. The method comprises the steps of: collecting data, calculating water-level change speeds of a deaerator and a hot well; determining a functional relation and determining the functional relation according to the steps. According to the method for estimating the throttling frequency-modulation load characteristics of condensed water for the thermoelectric generating set, the frequency-modulation load characteristics of condensed water stream can be accurately grasped through the method.
Description
Technical field
The present invention relates to thermal power generation technical field, relate to more specifically a kind of thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure.
Background technique
In order to improve the Primary frequency control ability and coordination level of control of thermal power generator, at present, power plant is generally in the control mode of improving unit, especially the super (super-) critical steam-turbine unit that is representative for the 1000MW steam turbine of above vapour-Siemens co-production, due to the method for operation of its use high-pressure regulation porthole standard-sized sheet, omnidistance sliding pressure, boiler accumulation of energy cannot rapid conversion be generation load, has seriously reduced the fm capacity of unit.For this reason, seeking a kind of new frequency modulation method is the task of top priority, and just in this case, water of condensation throttling frequency modulation technology comes into one's own gradually.
Water of condensation throttling frequency modulation be in fact by rapid change by the condensing water flow of low-pressure heater, carry out the amount of drawing gas of instantaneous change steam turbine set respective heater, thereby change fast the process of unit generation load.The part throttle characteristics of water of condensation throttling frequency modulation mainly refers to after condensing water flow flip-flop, relation is over time measured in power of the assembling unit change, and two aspects are the most key, and the one, the maximum power value that unit can change, be water of condensation throttling frequency modulation potentiality, the 2nd, load responding speed.
The generation load that water of condensation throttling can transform and the structural feature of unit own and relating to parameters, General Theoretical Analysis thinks that its limiting value is under rated load, to excise low-pressure heater and oxygen-eliminating device draws gas, makes it to return to acting in steam turbine, the obtainable increased power value of unit, but actual tests result shows, the change amount of the actual power of the assembling unit that can obtain of water of condensation throttling can obvious deviation theory value.Accurately grasp water of condensation throttling frequency modulation part throttle characteristics, both contributed to project decision, also contribute to the raising of unit frequency modulation control precision.
Therefore, how accurately to grasp water of condensation throttling frequency modulation part throttle characteristics, become those skilled in the art's important technological problems to be solved.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure, can grasp exactly by the method the current frequency modulation part throttle characteristics of condensing.
A kind of thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure provided by the invention, comprises step:
Data capture, under the condition remain unchanged in unit load command value, condensing water flow pace of change command value remaining unchanged, hot well water-feeding valve is closed and deaerator level is withdrawn from automatically, oxygen-eliminating device and water level of thermal well end value when collection deaerator level control valve pass hour oxygen-eliminating device and water level of thermal well initial value, deaerator level control valve turn down rear each Preset Time point unit load actual value and finish to gather unit load value, repeatedly change unit working condition, change unit load command value and condensing water flow pace of change command value, each change after unit load command value and condensing water flow pace of change command value, keeping, this unit load command value and condensing water flow pace of change command value are constant, under the condition that hot well water-feeding valve is closed and deaerator level is withdrawn from automatically, gather deaerator level control valve and close hour oxygen-eliminating device and water level of thermal well initial value, oxygen-eliminating device and water level of thermal well end value when deaerator level control valve turns down rear each described Preset Time point unit load actual value and finishes to gather unit load value,
Calculate oxygen-eliminating device and water level of thermal well pace of change, according to the oxygen-eliminating device collecting and water level of thermal well initial value, end value and acquisition time, the SEA LEVEL VARIATION speed U of calculating unit oxygen-eliminating device and hot well under each working condition;
Determine function relation, according to formula Δ N=Δ D
c∑ (k
iΔ H
i) and each described Preset Time point unit load actual value carry out matching, draw the relation between unit load variable quantity and the condensing water flow variable quantity of each time point; Derive the relation of unit load relative variation Y and time T according to the relation between the unit load variable quantity of each time point and condensing water flow variable quantity; According to the SEA LEVEL VARIATION speed of oxygen-eliminating device and hot well under each working condition, derive the relation between oxygen-eliminating device and water level of thermal well pace of change U and condensing water flow variable quantity Q;
Determine function relation according to described step, each relation of determining, draws the curve of unit load variations amount and condensing water flow variable quantity relation, unit load relative variation and time relationship and oxygen-eliminating device and water level of thermal well pace of change and condensing water flow variable quantity relation.
Preferably, described in described step data capture, each Preset Time point is respectively deaerator level control valve and turns down rear 15s, 1min, 3min, 5min.
Preferably, in described step data capture, by manually changing fast deaerator level control valve aperture to change condensing water flow pace of change command value.
Preferably, in described step data capture, by controlling condensate pump rotating speed to change condensing water flow pace of change command value.
A kind of thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure provided by the invention, comprise step: data capture, under the condition remain unchanged in unit load command value, condensing water flow pace of change command value remaining unchanged, hot well water-feeding valve is closed and deaerator level is withdrawn from automatically, oxygen-eliminating device and water level of thermal well end value when collection deaerator level control valve pass hour oxygen-eliminating device and water level of thermal well initial value, deaerator level control valve turn down rear each Preset Time point unit load actual value and finish to gather unit load value, repeatedly change unit working condition, change unit load command value and condensing water flow pace of change command value, each change after unit load command value and condensing water flow pace of change command value, keeping, this unit load command value and condensing water flow pace of change command value are constant, under the condition that hot well water-feeding valve is closed and deaerator level is withdrawn from automatically, gather deaerator level control valve and close hour oxygen-eliminating device and water level of thermal well initial value, oxygen-eliminating device and water level of thermal well end value when deaerator level control valve turns down rear each described Preset Time point unit load actual value and finishes to gather unit load value, calculate oxygen-eliminating device and water level of thermal well pace of change, according to the oxygen-eliminating device collecting and water level of thermal well initial value, end value and acquisition time, the SEA LEVEL VARIATION speed U of calculating unit oxygen-eliminating device and hot well under each working condition, determine function relation, according to formula Δ N=Δ D
c∑ (k
iΔ H
i) and each described Preset Time point unit load actual value carry out matching, draw the relation between unit load variable quantity and the condensing water flow variable quantity of each time point, derive the relation of unit load relative variation Y and time T according to the relation between the unit load variable quantity of each time point and condensing water flow variable quantity, according to the SEA LEVEL VARIATION speed of oxygen-eliminating device and hot well under each working condition, derive the relation between oxygen-eliminating device and water level of thermal well pace of change U and condensing water flow variable quantity Q, determine function relation according to described step, each relation of determining, draws the curve of unit load variations amount and condensing water flow variable quantity relation, unit load relative variation and time relationship and oxygen-eliminating device and water level of thermal well pace of change and condensing water flow variable quantity relation.
According to thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure provided by the invention, pass through field measurement, power of the assembling unit variable quantity while obtaining different load, different condensing water flow change amount, observe the impact of the water level of water of condensation throttling on oxygen-eliminating device, hot well, according to the theory unit load variable quantity that draws this conclusion that is directly proportional to condensing water flow variable quantity of deriving, calculate different condensing water flow change amounts, unit load variable quantity in the same time not; Or calculate the speed of SEA LEVEL VARIATION according to the constant interval of oxygen-eliminating device and water level of thermal well permission, by thering is definite proportionate relationship between SEA LEVEL VARIATION speed and condensing water flow variable quantity, determine condensing water flow variable quantity, thereby calculate under this water level limit value, the producible load variations amount of any time unit, thus the assessment of water of condensation throttling frequency modulation potentiality completed.Therefore, thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure provided by the invention, can grasp by the method the current frequency modulation part throttle characteristics of condensing exactly.
Brief description of the drawings
Fig. 1 is unit load variable quantity and condensing water flow variable quantity relation curve schematic diagram in the specific embodiment of the invention;
Fig. 2 is unit load relative variation and time relationship schematic diagram in the specific embodiment of the invention;
Fig. 3 is oxygen-eliminating device and water level of thermal well pace of change and condensing water flow variable quantity relation curve schematic diagram.
Wherein, in Fig. 1,
represent after 15s,
represent after 1min,---represent after 3min,
represent after 5min;
In Fig. 3,
represent oxygen-eliminating device,---represent A hot well,
represent B hot well.
Embodiment
The invention provides a kind of thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure, can grasp exactly by the method the current frequency modulation part throttle characteristics of condensing.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment who obtains under creative work prerequisite, belong to the scope of protection of the invention.
Thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure provided in the present embodiment, comprises step:
Data capture, under the condition remain unchanged in unit load command value, condensing water flow pace of change command value remaining unchanged, hot well water-feeding valve is closed and deaerator level is withdrawn from automatically, oxygen-eliminating device and water level of thermal well end value when collection deaerator level control valve pass hour oxygen-eliminating device and water level of thermal well initial value, deaerator level control valve turn down rear each Preset Time point unit load actual value and finish to gather unit load value, repeatedly change unit working condition, change unit load command value and condensing water flow pace of change command value, each change after unit load command value and condensing water flow pace of change command value, keeping, this unit load command value and condensing water flow pace of change command value are constant, under the condition that hot well water-feeding valve is closed and deaerator level is withdrawn from automatically, gather deaerator level control valve and close hour oxygen-eliminating device and water level of thermal well initial value, oxygen-eliminating device and water level of thermal well end value when deaerator level control valve turns down rear each described Preset Time point unit load actual value and finishes to gather unit load value,
Calculate oxygen-eliminating device and water level of thermal well pace of change, according to the oxygen-eliminating device collecting and water level of thermal well initial value, end value and acquisition time, the SEA LEVEL VARIATION speed U of calculating unit oxygen-eliminating device and hot well under each working condition;
Determine function relation, according to formula Δ N=Δ D
c∑ (k
iΔ H
i) and each described Preset Time point unit load actual value carry out matching, draw the relation between unit load variable quantity and the condensing water flow variable quantity of each time point; Derive the relation of unit load relative variation Y and time T according to the relation between the unit load variable quantity of each time point and condensing water flow variable quantity; According to the SEA LEVEL VARIATION speed of oxygen-eliminating device and hot well under each working condition, derive the relation between oxygen-eliminating device and water level of thermal well pace of change U and condensing water flow variable quantity Q;
Determine function relation according to described step, each relation of determining, draws the curve of unit load variations amount and condensing water flow variable quantity relation, unit load relative variation and time relationship and oxygen-eliminating device and water level of thermal well pace of change and condensing water flow variable quantity relation.
According to thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure provided by the invention, pass through field measurement, power of the assembling unit variable quantity while obtaining different load, different condensing water flow change amount, observe the impact of the water level of water of condensation throttling on oxygen-eliminating device, hot well, according to the theory unit load variable quantity that draws this conclusion that is directly proportional to condensing water flow variable quantity of deriving, calculate different condensing water flow change amounts, unit load variable quantity in the same time not; Or calculate the speed of SEA LEVEL VARIATION according to the constant interval of oxygen-eliminating device and water level of thermal well permission, by thering is definite proportionate relationship between SEA LEVEL VARIATION speed and condensing water flow variable quantity, determine condensing water flow variable quantity, thereby calculate under this water level limit value, the producible load variations amount of any time unit, thus the assessment of water of condensation throttling frequency modulation potentiality completed.Therefore, thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure provided by the invention, can grasp by the method the current frequency modulation part throttle characteristics of condensing exactly.
Content will be respectively deaerator level control valve taking each Preset Time point and turn down rear 15s, 1min, 3min, 5min as example below, and thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure provided by the invention is described in detail.
When collection in worksite data, requirement remains unchanged in unit load command value, condensing water flow pace of change command value remains unchanged, require unit AGC, boiler-turbine coordinated, primary frequency modulation to withdraw from, turbine high-pressure regulates porthole standard-sized sheet, and steady load operation more than some minutes remains unchanged with guarantee unit load command value; When test, hot well water-feeding valve is closed, and deaerator level is withdrawn from automatically, and the each low-pressure heater water level of unit drops into automatically, and deaerator level control valve has certain two-way adjustment allowance, to ensure that condensing water flow pace of change command value remains unchanged.
When image data, manually change fast aperture or the condensate pump rotating speed of deaerator level control valve, record the parameters such as unit load, condensing water flow, oxygen-eliminating device and water level of thermal well, at least continue 5min or water level parameter and reach when control boundary value is set, manually adjust oxygen-eliminating device and water level of thermal well to normal value.Above-mentioned test point several operating modes under different load, different condensing water flow change amount are carried out.
Unit load variation delta N and condensing water flow variation delta D
cbetween theoretical relationship be Δ N=Δ D
c∑ (k
iΔ H
i), wherein Δ H
irepresent the actual specific enthalpy drop that i level is drawn gas while returning to turbine body acting, k
ifor scaling factor.This formula is to draw in the specific enthalpies of drawing gas at different levels, level heater condensate specific enthalpy, water of condensation specific enthalpy etc. are not constant in the situation that, does not also consider mechanical efficiency and generating efficiency.
When water of condensation throttling, the parameter of steam turbine heat engine system changes comparatively complicated, too much hypothesis is processed accumulation with simplification and is got up to make theoretical analysis result can depart from actual conditions, reduce to a certain extent theoretical accuracy in computation, therefore, the assessment of water of condensation throttling frequency modulation part throttle characteristics has been needed to carry out in conjunction with on-the-spot actual test, for this reason, this embodiment, in conjunction with on-site data gathering result, is calculated water of condensation throttling frequency modulation potentiality, and key step is as follows:
(1) arrange test data
Start to close hour timing with deaerator level control valve, need to arrange and obtain following data relationship curve according to test result under different operating modes: the relation curve between condensing water flow change amount and representational moment (being generally 15s, 1min, 3min and 5min) unit load change amount; Taking 5min moment changing load amount as benchmark, the load relative variation relation over time that other moment is average; Calculate 1min to the interior oxygen-eliminating device of 5min and water level of thermal well pace of change, and obtain the relation curve between it and condensing water flow change amount.
(2) use specific function to be related to matched curve
This conclusion that is directly proportional to condensing water flow variable quantity according to unit load variable quantity, rejects the data of this conclusion of substantial deviation, and usage ratio is related to the relation curve between matching condensing water flow change amount and representational moment unit load change amount; Do not consider the impact of the factors such as shape, internal unit take, the SEA LEVEL VARIATION of oxygen-eliminating device and hot well must be the linear relationship of negative correlation, both SEA LEVEL VARIATION speed is also all proportional with condensing water flow variable quantity, therefore, usage ratio is related to matching condensing water flow change amount and oxygen-eliminating device, water level of thermal well pace of change relation curve; Use quadratic function or cubic function to be related to the load relative variation relation curve over time that matching is average.
(3) calculate water of condensation throttling frequency modulation potentiality
The corresponding load variations amount of any condensing water flow variable quantity of inscribing while calculating certain representativeness according to matching relation; Calculate the load variations relative quantity of any time according to matching relation, can calculate thus the load variations amount of any condensing water flow variable quantity, any time unit.In order to ensure the security of operation of unit, it is high that oxygen-eliminating device and hot well are provided with water level, low limit value, the normal runtime value of water level is with high, scope between low limit value has formed the operable interval of water of condensation throttling frequency modulation, according to needing the Time Calculation of fm role to go out the speed of SEA LEVEL VARIATION, owing to thering is definite proportionate relationship between SEA LEVEL VARIATION speed and condensing water flow variable quantity, can determine condensing water flow variable quantity, thereby can calculate under this water level limit value, the producible load variations amount of any time unit, thereby complete the assessment of water of condensation throttling frequency modulation potentiality.
On the basis of above-mentioned result of calculation, the test result of load responding time during in conjunction with site test, can complete the assessment of water of condensation throttling frequency modulation part throttle characteristics.
Application the present invention; can be before water of condensation throttling frequency modulation function be implemented; understand its frequency modulation potentiality by test; observe the Changing Pattern of oxygen-eliminating device and water level of thermal well; so that formulate effective control strategy; rationally determine the isoparametric control range of water level, improve frequency modulation control precision, guarantee unit safety operation.
Content, by being example for certain the 660MW ultra supercritical fired power generating unit that uses upper vapour-Siemens N660-25/600/600 type steam turbine, describes in detail to method provided by the invention below.
The load-characteristic test of water of condensation throttling frequency modulation is carried out at scene, shown in main experimental data following table.
According to these table data, draw and close after valve not in the same time condensing water flow variable quantity with the relation curve of load variations amount, and be related in proportion matching, obtain following serial function relation:
Close after valve 15s: Δ N=-0.0123 Δ D
c-0.1211
Close after valve 1min: Δ N=-0.0183 Δ D
c-0.3959
Close after valve 3min: Δ N=-0.0294 Δ D
c-1.5528
Close after valve 5min: Δ N=-0.0321 Δ D
c-0.3799
The relative load variable quantity Y relation of T in time:
Y＝3E-07T
3-0.0008T
2+0.4347T+33.525
Relation between oxygen-eliminating device and water level of thermal well pace of change U and condensing water flow variable quantity Q:
Oxygen-eliminating device: U=0.1528Q+2.529;
A hot well: U=-0.1168Q-6.5763
B hot well: U=-0.1121Q-4.63
By above-mentioned serial relation, can draw out as shown in Figure 1, Figure 2 with Fig. 3 in curve, please refer to Fig. 1-Fig. 3, Fig. 1 is unit load variable quantity and condensing water flow variable quantity relation curve schematic diagram in the specific embodiment of the invention; Fig. 2 is unit load relative variation and time relationship schematic diagram in the specific embodiment of the invention; Fig. 3 is oxygen-eliminating device and water level of thermal well pace of change and condensing water flow variable quantity relation curve schematic diagram.
In the situation that deaerator level allows excursion definite, the time of water of condensation fm role as required, can calculate deaerator level pace of change, and obtain corresponding condensing water flow variable quantity by Fig. 3, then obtained the load variations amount of different representative moment units by Fig. 1, finally can obtain closing data after valve 5min is the unit relative load variable quantity of benchmark, any time, thereby completes the calculating that water of condensation is regulated to frequency modulation potentiality.In conjunction with the load responding time after water of condensation throttling, can realize the assessment to this unit water of condensation throttling frequency modulation part throttle characteristics.
Above a kind of thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure provided by the present invention is described in detail, applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (4)
1. a thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure, is characterized in that, comprises step:
Data capture, under the condition remain unchanged in unit load command value, condensing water flow pace of change command value remaining unchanged, hot well water-feeding valve is closed and deaerator level is withdrawn from automatically, oxygen-eliminating device and water level of thermal well end value when collection deaerator level control valve pass hour oxygen-eliminating device and water level of thermal well initial value, deaerator level control valve turn down rear each Preset Time point unit load actual value and finish to gather unit load value, repeatedly change unit working condition, change unit load command value and condensing water flow pace of change command value, each change after unit load command value and condensing water flow pace of change command value, keeping, this unit load command value and condensing water flow pace of change command value are constant, under the condition that hot well water-feeding valve is closed and deaerator level is withdrawn from automatically, gather deaerator level control valve and close hour oxygen-eliminating device and water level of thermal well initial value, oxygen-eliminating device and water level of thermal well end value when deaerator level control valve turns down rear each described Preset Time point unit load actual value and finishes to gather unit load value,
Calculate oxygen-eliminating device and water level of thermal well pace of change, according to the oxygen-eliminating device collecting and water level of thermal well initial value, end value and acquisition time, the SEA LEVEL VARIATION speed U of calculating unit oxygen-eliminating device and hot well under each working condition;
Determine function relation, according to formula Δ N=Δ D
c∑ (k
iΔ H
i) and each described Preset Time point unit load actual value carry out matching, in formula, Δ N represents power of the assembling unit change amount, Δ D
crepresent variable quantity, the k of condensing water flow
ifor scaling factor, Δ H
irepresenting that i level is drawn gas returns to the turbine body actual specific enthalpy drop in when acting, draws the relation between unit load variable quantity and the condensing water flow variable quantity of each time point; Derive the relation of unit load relative variation Y and time T according to the relation between the unit load variable quantity of each time point and condensing water flow variable quantity; According to the SEA LEVEL VARIATION speed of oxygen-eliminating device and hot well under each working condition, derive the relation between oxygen-eliminating device and water level of thermal well pace of change U and condensing water flow variable quantity Q;
Determine function relation according to described step, each relation of determining, draws the curve of unit load variations amount and condensing water flow variable quantity relation, unit load relative variation and time relationship and oxygen-eliminating device and water level of thermal well pace of change and condensing water flow variable quantity relation.
2. thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure as claimed in claim 1, it is characterized in that, described in described step data capture, each Preset Time point is respectively deaerator level control valve and turns down latter 15 seconds, 1 minute, 3 minutes, 5 minutes.
3. thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure as claimed in claim 2, it is characterized in that, in described step data capture, by manually changing fast deaerator level control valve aperture to change condensing water flow pace of change command value.
4. thermal power generator water of condensation throttling frequency modulation part throttle characteristics appraisal procedure as claimed in claim 2, is characterized in that, in described step data capture, by controlling condensate pump rotating speed to change condensing water flow pace of change command value.
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