CN111581821B - Heating unit peak regulation capacity determining method based on actually measured performance parameters - Google Patents
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Abstract
The invention discloses a method for determining peak shaving capacity of a heat supply unit based on actual measurement performance parameters, which is characterized in that actual measurement performance data (such as actual measurement cylinder efficiency of a main machine, actual measurement pressure loss of a pipeline, actual measurement end difference of a heater and the like) based on operation characteristics of main and auxiliary machines of the unit are combined with a variable working condition theory of a steam turbine, and fine modeling simulation of heat supply working conditions of the unit is carried out through unit heat balance correction calculation, so that the accurate determination of thermoelectric characteristics under the heat supply working conditions of the unit is realized, the peak shaving capacity characteristics under the heat supply conditions of the unit are determined, and powerful technical support is provided for peak shaving and energy-saving scheduling of a power grid.
Description
Technical Field
The invention belongs to the field of calculation of the performance of a steam turbine of a thermal power plant, and particularly relates to a method for determining the peak regulation capacity of a heating unit based on measured performance parameters.
Background
In recent years, with the development of national economy, the heating demand in winter is larger and larger, especially the urban central heating area is rapidly increased, the heating unit is continuously put into operation, most or even all of the heating tasks are responsible for the thermal power plant in the heating area which is not configured by the peak regulating boiler, the generating set needs to be operated with heat to electricity, and the electric load is limited by the heating load demand, so that the peak regulating capacity of the heating unit is determined to be important for the stable operation and sufficient heat energy supply of the whole heating area power grid.
The Chinese patent application with publication number of CN105202623A discloses a heating peak shaving capacity prediction method of a heating unit, which comprises the steps of selecting at least one power plant with representativeness, collecting data of heating design data, heating equipment conditions, industrial heat load, heating heat load media, parameters and modes of the heating unit, determining the design heat load of a heating area and the heat dissipation area of a radiator through data analysis and theoretical calculation, and considering the influence analysis of climate change on the heat dissipation capacity and the heat supply capacity of a building and the peak shaving capacity prediction of the heating period of the power plant.
Disclosure of Invention
Therefore, the invention aims to provide a heat supply unit peak regulation capacity determining method based on measured performance parameters, which combines the dynamic change of heat supply capacity of a unit with the variable working condition theory of a steam turbine through unit heat balance correction calculation on the basis of the measured performance parameters of the unit, establishes a unit thermoelectric characteristic calculation model and carries out full working condition simulation calculation, accurately determines the peak regulation capacity of the heat supply unit, reflects the actual condition of the unit, powerfully supports the power grid peak regulation, and ensures the operation safety of the unit and the power grid.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a heat supply unit peak regulation capacity determining method based on actually measured performance parameters comprises the following steps:
1) Selecting a plurality of load points in an operation interval of the unit, and performing an operation parameter actual measurement test under each selected load point to obtain an operation actual measurement performance parameter of the unit;
2) According to the actual measurement performance parameters of the unit and the variable working condition theory of the steam turbine, a thermoelectric characteristic calculation model of the unit is established through thermal balance correction calculation of the unit, and full working condition modeling simulation calculation is carried out on the heat supply working conditions of the unit to obtain thermoelectric characteristics of each heat supply working condition of the unit;
3) And obtaining the peak regulation upper limit and the peak regulation lower limit of the unit under different heat supply states according to the calculation results of the thermoelectric characteristics of the unit under different heat supply conditions.
Further, in the step 1), the running interval of the unit load is 50% to 100% tha, 3 to 6 load points are selected in each unit load running interval, and running parameter actual measurement tests are carried out on the selected load points according to test standards, wherein the unit running actual measurement performance parameters comprise unit body performance, pipeline system performance and related auxiliary machine performance.
Further, the step of the parameter actual measurement test is as follows: selecting 3-6 load points, carrying out each load point for 1 hour, normally putting main and auxiliary equipment into operation in a test, recording data and carrying out performance parameter calculation to obtain unit operation actual measurement performance parameters, wherein the unit body performance is high, medium and low pressure cylinder efficiency, each steam extraction stage efficiency and flow pressure ratio coefficient, the pipeline system performance is steam extraction pipeline pressure loss, the related auxiliary equipment performance is heater performance and pump performance, the heater performance is the upper end difference and the lower end difference of the heater, and the pump performance is pump enthalpy rise.
Further, the step 2) includes: and selecting a plurality of industrial steam extraction flow values in the industrial steam extraction range, respectively setting different main steam flow and heating steam extraction flow values under the selected industrial steam extraction flow values as heating working conditions, substituting heating working condition setting data into a unit thermoelectric characteristic calculation model for simulation calculation, and obtaining thermoelectric characteristics of each heating working condition.
Further, the range of the main steam flow is from the lowest stable combustion flow of the boiler to the maximum evaporation capacity, a first-grade main steam flow is set according to integers at intervals of a certain value, the range of the industrial steam extraction is from 0t/h to the maximum industrial steam extraction, a first-grade industrial steam extraction is set according to integers at intervals of a certain value, the range of the heating steam extraction is from 0t/h to the maximum heating steam extraction, a first-grade heating steam extraction is set according to integers at intervals of a certain value, and 200-500 heating working condition data are selected for unit thermoelectric characteristic calculation model simulation calculation.
Further, different heating extraction amounts are set as heating states under the selected industrial extraction amount, and peak regulation upper limit and peak regulation lower limit under each heating state are obtained.
In the prior art, the thermoelectric characteristics of the heat supply unit are mainly determined according to theoretical calculation of manufacturers, and the calculation is calculated under design performance parameters and boundary conditions, so that the actual conditions of the unit cannot be completely reflected, a certain influence is caused on actual scheduling, the stable operation of the whole power grid is further influenced, and the heat energy supply is also influenced. In addition, because the change of the heat supply quantity depends on heat users, the large-scale adjustment of the heat supply quantity of the heat supply unit cannot be easily realized, and therefore, the full-working-condition actual measurement of the thermoelectric characteristics of the heat supply unit cannot be realized by a test method for adjusting the heat supply quantity on site, and a new method is necessary to be researched to solve the accurate determination of the thermoelectric characteristics of the heat supply unit.
According to the invention, a unit thermoelectric characteristic calculation model is established through unit heat balance correction calculation according to combination of unit operation actual measurement performance parameters and turbine variable working condition theory, heat supply working condition setting data are substituted into the unit thermoelectric characteristic calculation model to carry out full working condition simulation calculation, the unit thermoelectric characteristic calculation model is attached to reality, and accurate determination of thermoelectric characteristics under the unit heat supply working condition is realized, so that the peak regulation upper limit and the peak regulation lower limit under each heat supply state are more accurate and can reflect the actual condition of the unit, and powerful technical support is provided for power grid peak regulation and energy saving scheduling.
Drawings
FIG. 1 is a diagram of heating conditions under the condition that industrial air extraction is 0t/h and heating flow is 0 t/h;
FIG. 2 is a graph of heating conditions under the conditions of 0t/h of industrial steam extraction and 0, 100, 200, 300, 400, 500 and 600t/h of heating flow rate;
FIG. 3 is a graph of heating conditions under industrial steam extraction of 50t/h and heating flows of 0, 100, 200, 300, 400, 500 and 600t/h respectively;
FIG. 4 is a graph of heating conditions under industrial steam extraction of 100t/h and heating flows of 0, 100, 200, 300, 400, 500 and 600t/h respectively;
FIG. 5 is a diagram of the whole working condition of the unit heat supply;
fig. 6 is a graph showing peak shaving ability characteristics under different heating conditions.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A heat supply unit peak regulation capacity determining method based on actually measured performance parameters comprises the following steps:
1) Selecting a plurality of load points in an operation interval of the unit, and performing an operation parameter actual measurement test under each selected load point to obtain an operation actual measurement performance parameter of the unit;
2) According to the obtained actual measurement performance parameters of the unit operation and the variable working condition theory of the steam turbine, a unit thermoelectric characteristic calculation model is established through unit heat balance correction calculation, and full working condition modeling simulation calculation is carried out on the unit heating working conditions to obtain thermoelectric characteristics of each heating working condition of the unit;
3) And obtaining the peak regulation upper limit and the peak regulation lower limit of the unit under different heat supply states according to the calculation results of the thermoelectric characteristics of the unit under different heat supply conditions.
Taking a 660MW supercritical heat supply unit as an example, in step 1), 5 load points, namely THA1, THA2, 600MW, 500MW and 330MW, are selected in an operation interval of 50-100% of THA unit load, and parameter actual measurement tests are carried out under the selected loads:
under the selected load points, each load point is subjected to one hour, main equipment and auxiliary equipment of main equipment and auxiliary equipment are normally put into operation in the test process, test data are collected and arranged, the test method and the arrangement calculation of the test data refer to American society of mechanical Engineers (ANSI/ASME PTC 6-2004) for testing the performance of a steam turbine, the arithmetic average value of the collected data is calculated according to the test record data, and then the arithmetic average value of each measuring point is taken as test original measurement data after the correction of the zero position, the height difference, the atmospheric pressure, the check value of the instrument and the like of the instrument, and the arithmetic average value of each measuring point is taken for the conditions of the same parameter and multiple measuring points; the calculation formula of the main actually measured performance parameters is as follows according to the reference national energy agency (technical economic index calculation method of thermal power plant) (DL/T904-2015) and national energy agency (electric energy saving technology supervision guide (DL/T1052-2016)) when calculating the performance parameters:
1) The performance of the unit body is expressed by the high pressure cylinder efficiency, the medium pressure cylinder efficiency, the low pressure cylinder efficiency, the extraction stage efficiency and the flow pressure ratio coefficient
High and medium pressure cylinder efficiency:
h 0 -steam turbine high and medium pressure cylinder admission enthalpy, kJ/kg
h c High and medium pressure cylinder exhaust enthalpy of steam turbine, kJ/kg
h l Isentropic expansion end enthalpy of exhaust steam of high and medium pressure cylinders of the steam turbine, kJ/kg;
the low pressure cylinder efficiency is calculated by heat balance according to ASME standard.
Stage efficiency of the steam extraction section:
h 0n -cylinder admission enthalpy, kJ/kg, of the cylinder in which the extraction section is located
h cn -enthalpy of extraction of each extraction section, kJ/kg
h ln -isentropic expansion endpoint enthalpy of extraction steam of each extraction steam section, kJ/kg;
steam pressure ratio coefficient of steam extraction section:
a) Extraction section before industrial extraction:
C isg -flow to pressure ratio coefficient
P i Steam pressure of steam extraction section before industrial steam extraction, MPa
P sg Industrial extraction pressure, MPa
W i Steam flow after extraction section, t/h
b) Extraction section between industrial extraction and heating extraction:
C icn -flow to pressure ratio coefficient
P i Steam pressure of steam extraction section between industrial steam extraction and heating steam extraction, and MPa
P cn Heating and steam extraction pressure, MPa
W i Steam flow after extraction section, t/h
c) Extraction section after heating extraction:
C in -flow to pressure ratio coefficient
P i Steam pressure of steam extraction section after heating and steam extraction, and MPa
W i Steam flow after extraction section, t/h
2) Pipeline system performance, expressed as steam extraction pipeline pressure loss
P 1 Steam extraction pressure, MPa
P 2 Steam inlet pressure, MPa;
3) The heater performance is mainly expressed by the difference of the upper ends of the heaters and the difference of the lower ends of the heaters:
Ar s ＝t s -t 1
t s -saturation temperature at heater inlet pressure, DEG C
t 1 -heater outlet water temperature, DEG C
Lower end difference of heater:
ΔT w ＝t w -t 2
t w -heater drain temperature, DEG C
t 2 -water inlet temperature of the heater, DEG C;
4) Pump performance, mainly expressed as pump enthalpy rise
ΔH＝h 1 -h 2
h 1 Pump output enthalpy, kJ/kg
h 2 Pump intake enthalpy, kJ/kg;
the actual measurement performance parameters of the finishing unit are shown in table 1:
table 1 table of measured performance parameters of the unit
Fitting a fitting function based on the main steam flow for each measured performance parameter and calculation data in the table:
P n ＝f n (Q)
P n -measured performance parameters and calculated data of each unit
Q-Main steam flow
f n (Q) -Main steam flow based fitting function
In the step 2), according to the obtained actual measurement performance parameters of the unit, technical data (electromechanical loss, exhaust steam loss and the like) of the heat supply unit are referred to, and a thermoelectric characteristic calculation model of the unit is established through unit heat balance correction calculation by combining a correction calculation method in a turbine variable working condition theory and a type of correction calculation method in American society of mechanical engineers (turbine performance test procedure) (ANSI/ASME PTC 6-2004). The calculation method is different from a correction calculation method in ASME standard in that the correction is to correct the calculation result to design parameters and guarantee working conditions, the calculation method is to correct the calculation result to actual measurement performance parameters, the actual measurement performance parameters are subjected to fitting processing aiming at the flow of each load section in the calculation process, and system boundary conditions such as the minimum flow of a low-pressure cylinder, the maximum exhaust steam temperature of a medium-pressure cylinder and the like are considered in modeling, so that all the operation working conditions can be considered. The main parameters of the thermodynamic system of the unit in modeling are calculated as follows:
1. main steam pressure:
calculating according to actual sliding pressure running curve of unit
P zq ＝f zq (Q)
P zq Main steam pressure, MPa
f zq And (Q), an actual sliding pressure operation curve function of the unit in the DCS.
2. Main steam temperature:
because the main steam temperature is controlled according to the design value in the actual operation process of most units, the main steam temperature is calculated according to the design value of the units during calculation.
3. Reheat steam pressure:
P zr ＝P gp ×(1-f ΔPzr (Q))
P zr reheat steam pressure, MPa
P gp -high cylinder exhaust pressure, MPa
f ΔPzr (Q) -a fitted function of reheater pressure loss based on main steam flow.
4. Reheat steam temperature:
as most units are controlled according to the design value in the actual operation process, the reheat steam temperature is calculated according to the design value of the units during calculation.
5. Feed water pressure:
P g ＝f g (Q)
P g feed water pressure, MPa
f g (Q) -the measured feedwater pressure is based on a fitted function of the main steam flow.
6. Feed water temperature:
the feed water temperature is calculated as the last stage feed water temperature entering the boiler.
7. Condensation water pressure:
P c ＝f c (Q)
P c -coagulationWater pressure, MPa
f c (Q) -a fitted function of measured condensate pressure based on main steam flow.
8. Steam pressure of steam extraction section
According to the Friedel formula, the steam pressure of each steam extraction section is determined by three conditions:
a) Steam pressure of steam extraction section before industrial steam extraction:
P i steam pressure of steam extraction section before industrial steam extraction, MPa
P sg Industrial extraction pressure, MPa
W i Steam flow after extraction section, t/h
f cisg (Q) -fitting function of flow-to-pressure ratio coefficient based on main steam flow
b) Steam pressure of steam extraction section between industrial steam extraction and heating steam extraction:
P i steam pressure of steam extraction section between industrial steam extraction and heating steam extraction, and MPa
P cn Industrial extraction pressure, MPa
W i Steam flow after extraction section, t/h
f cicn (Q) -fitting function of flow-to-pressure ratio coefficient based on main steam flow
c) Steam pressure of the steam extraction section after heating and steam extraction:
P i steam pressure of steam extraction section after heating and steam extraction, and MPa
W i Steam flow after extraction section, t/h
f cin (Q) -fitting function of flow-to-pressure ratio coefficient based on main steam flow
9. Vapor enthalpy value of vapor extraction section
a) Vapor enthalpy of extraction section in high pressure cylinder:
H i ＝H zq -(H zq -H li )*f ηH (Q)
H i -vapor enthalpy of extraction section in high pressure cylinder, kJ/kg
H zq -main vapor enthalpy, kJ/kg
H li Isentropic expansion end enthalpy of extraction steam of each extraction steam section, kJ/kg
f ηH (Q) -fitting function of cylinder efficiency based on main steam flow
b) Vapor enthalpy of extraction section in medium pressure cylinder:
H i ＝H zr -(H zr -H li )*f η I(Q)
H i -vapor enthalpy of extraction section in medium pressure cylinder, kJ/kg
H zr -reheat steam enthalpy, kJ/kg
H li Isentropic expansion end enthalpy of extraction steam of each extraction steam section, kJ/kg
f ηI (Q) -fitting function of medium pressure cylinder efficiency based on Main steam flow
c) Vapor enthalpy of extraction section in low pressure cylinder:
H i ＝H zl -(H zl -H li )*fη L (Q)
H i -vapor enthalpy of extraction section in low pressure cylinder, kJ/kg
H zl -low pressure cylinder steam admission enthalpy, kJ/kg
H li Isentropic expansion end enthalpy of extraction steam of each extraction steam section, kJ/kg
f ηL (Q) -fitting function of low pressure cylinder efficiency based on main steam flow
10. Steam temperature and entropy value of steam extraction section
The steam pressure and the steam enthalpy value calculated by the above formula are obtained by inquiring the temperature and the entropy value of the steam of each steam extraction section through a water and steam thermodynamic property calculation program.
11. Steam inlet pressure of heater
P ii ＝P i ×(1-f ΔPi (Q))
P ii -steam inlet pressure of each heater, MPa
P i Steam pressure of steam extraction section corresponding to each heater, and MPa
f ΔPi (Q) -a fitting function of the pressure loss of each extraction conduit based on the main steam flow.
12. Enthalpy value of heater steam admission
According to the correction calculation rule in the ASME standard, the steam inlet enthalpy value of each heater is calculated according to the corresponding steam extraction enthalpy value.
13. Steam inlet temperature of heater
The steam pressure and the steam enthalpy value calculated by the above formula of the temperature of the steam entering the heater are obtained by inquiring a water and steam thermodynamic property calculation program.
14. Water outlet temperature of heater
T oi ＝T si (P ii )-f ΔTsi (Q)
T oi -outlet water temperature of each heater, DEG C
T si (P ii ) Saturated steam temperature and DEG C under the corresponding steam inlet pressure of each heater
f ΔTsi (Q) -a fitted function of the difference in the upper ends of the heaters based on the main steam flow.
15. Water inlet temperature of heater
The water inlet temperature of the heater is calculated according to the water outlet temperature of the heater at the upper stage (water inlet side).
16. Drainage temperature of heater
T wi ＝T ii +f ΔTwi (Q)
T wi -the hydrophobic temperature of each heater, DEG C
T ii -water inlet temperature of each heater, DEG C
f ΔTwi (Q) -a fitted function of the difference in the lower ends of the heaters based on the main steam flow.
17. Water outlet temperature of water supply pump
T go ＝f PH2T (P g ，(H gi +f ΔHg (Q)))
T go -water outlet temperature of water supply pump, DEG C
P g Feed water pressure, MPa
H gi -feed pump intake enthalpy, kJ/kg
f ΔHg (Q) -fitting function of feed pump enthalpy rise based on main steam flow
f PH2T (P, H) -the function of temperature is calculated from the pressure and enthalpy values in the water and steam thermodynamic property calculation program.
18. Water outlet temperature of condensate pump
T co ＝f PH2T (P c ，(H ci +f ΔHc (Q)))
T co -temperature of water outlet of condensate pump, DEG C
P c -condensation pressure, MPa
H ci -enthalpy value of intake water of condensate pump, kJ/kg
f ΔHc (Q) -fitting function of condensate pump enthalpy rise based on main steam flow
f PH2T (P, H) -the function of temperature is calculated from the pressure and enthalpy values in the water and steam thermodynamic property calculation program.
The main parameters required by the heat balance calculation of all main and auxiliary machines in the thermodynamic system of the unit can be calculated and determined by using the calculation method, and then the unit output is obtained by the heat balance calculation of the steam turbine, so that a thermoelectric characteristic calculation model of the unit is established. The thermoelectric characteristics of different heat supply working conditions of the unit are simulated and calculated, and the specific steps are as follows:
the unit is designed with two sections of heat supply steam extraction, namely industrial steam extraction and heating steam extraction, wherein the industrial steam extraction range is 0-100 t/h, the industrial steam extraction ranges are respectively set to 0, 50 and 100t/h in simulation calculation, the heating steam extraction range is 0-600 t/h, the heating steam extraction ranges are respectively set to 0, 100, 200, 300, 400, 500 and 600t/h, the main steam flow is calculated from the lowest steady combustion flow of a boiler to the maximum evaporation capacity of the boiler, one-grade flow is set every 100t/h according to an integer, different main steam flow and heating steam extraction flow values are respectively set under the selected industrial steam extraction flow values to serve as heat supply working conditions, and 200-500 heat supply working conditions are selected for full working condition simulation calculation in order to enhance the coverage and reliability of calculation results.
When the low-pressure cylinder exhaust pressure is calculated, the design value is 4.9kPa, the low-pressure cylinder exhaust flow is required to be ensured to be not less than 280t/h, the medium-pressure cylinder exhaust temperature is not more than 350 ℃, and the heating exhaust pressure is not less than 0.4MPa under the heating and heat supply working condition.
Taking industrial steam extraction as an example, heating flow is 0t/h, main steam flow is from the lowest stable combustion flow of a boiler to the maximum evaporation capacity, one-grade flow is set at intervals of 100t/h according to integers, 16-grade flow is set in total, and thermoelectric characteristics of 16 different heating working conditions are obtained, and the calculation results are shown in Table 2:
TABLE 2 partial calculation of the Industrial steam extraction at 0t/h
| Parameter name | Unit (B) | Working |
Working condition 2 | Working condition 3 | Working condition 4 | …… | Working condition 16 |
| Main steam flow | t/h | 2057.1 | 2000 | 1900 | 1800 | …… | 616.880 |
| Flow rate of industrial steam extraction | t/ |
0 | 0 | 0 | 0 | …… | 0 |
| Heating steam extraction flow | t/ |
0 | 0 | 0 | 0 | …… | 0 |
| Main steam pressure | MPa | 28.000 | 28.000 | 28.000 | 28.000 | …… | 13.403 |
| Main steam temperature | ℃ | 600.0 | 600.0 | 600.0 | 600.0 | …… | 600.0 |
| Reheat steam pressure | MPa | 5.442 | 5.330 | 5.122 | 4.900 | …… | 1.832 |
| Reheat steam temperature | ℃ | 620.0 | 620.0 | 620.0 | 620.0 | …… | 598.5 |
| Pressure of industrial steam extraction | MPa | 2.750 | 2.706 | 2.618 | 2.519 | …… | 1.002 |
| Industrial steam extraction temperature | ℃ | 323.2 | 322.6 | 321.1 | 319.1 | …… | 266.9 |
| Heating and steam extraction pressure | MPa | 0.479 | 0.472 | 0.457 | 0.440 | …… | 0.182 |
| Heating and steam extraction temperature | ℃ | 266.9 | 267.8 | 269.0 | 269.9 | …… | 267.9 |
| Final feedwater temperature | ℃ | 301.1 | 299.4 | 296.4 | 293.5 | …… | 235.9 |
| Exhaust flow rate of low pressure cylinder | t/h | 1108.537 | 1086.711 | 1044.475 | 998.686 | …… | 404.993 |
| Thermoelectric ratio | 0.00％ | 0.00％ | 0.00％ | 0.00％ | …… | 0.00％ | |
| Heating ratio | 0.00％ | 0.00％ | 0.00％ | 0.00％ | …… | 0.00％ | |
| Heat rate | kJ/kWh | 7633.67 | 7611.68 | 7582.26 | 7525.95 | …… | 8107.11 |
| Power of generator | MW | 709.174 | 695.948 | 671.203 | 648.172 | …… | 233.353 |
According to Table 2, a heating condition diagram is drawn, as shown in FIG. 1, under the condition that the industrial steam extraction is 0 t/h.
The next step is to calculate the thermoelectric properties of the following conditions: the industrial steam extraction is 0t/h, the heating steam extraction is 100, 200, 300, 400, 500 and 600t/h respectively, the main steam flow is from the lowest steady combustion flow of the boiler to the maximum evaporation capacity, a first-gear flow is set according to an integer every 100t/h, the thermoelectric characteristic of each heating working condition is calculated, after calculation, when the industrial steam extraction is 0t/h, the heating working condition diagrams under the conditions of 0, 100, 200, 300, 400, 500 and 600t/h are drawn, and the heating working condition diagrams are shown in figure 2.
Referring to the drawing method of the heat supply working condition diagram when the industrial extraction is 0t/h, the heat supply working condition diagram when the industrial extraction is 50t/h and the heating flow is 0, 100, 200, 300, 400, 500 and 600t/h is drawn, and the drawing method is shown in figure 3.
Referring to the drawing method of the heat supply working condition diagram when the industrial extraction is 0t/h, the heat supply working condition diagram when the industrial extraction is 100t/h and the heating flow is 0, 100, 200, 300, 400, 500 and 600t/h respectively is drawn, as shown in fig. 4.
Summarizing fig. 2, 3 and 4, a unit heating full-condition diagram is obtained, as shown in fig. 5.
In the step 3), the industrial steam extraction amounts are respectively set to 0, 50 and 100t/h, the heating steam extraction amounts are respectively set to 0, 100, 200, 300, 400, 500 and 600t/h, different heating steam extraction amounts are set to be used as heating states under the selected industrial steam extraction amounts, the maximum value and the minimum value of the unit electric load under each heating state are obtained according to fig. 2, 3 and 4 and are respectively used as peak regulation upper limit and peak regulation lower limit, and peak regulation capability characteristic diagrams under different heating states are drawn, as shown in fig. 6.
When drawing fig. 6, the support of the preferential policy of the government on the heat supply unit is considered, namely, the adjustable lower limit of the electric load of the heat supply unit is not lower than 50% of the first-time rated output (600 MW) of the unit.
Finally, it is noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and that other modifications and equivalents thereof by those skilled in the art should be included in the scope of the claims of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (2)
1. The method for determining the peak shaving capacity of the heating unit based on the actually measured performance parameters is characterized by comprising the following steps:
1) Selecting a plurality of load points in an operation interval of a unit, performing actual measurement test of operation parameters under each selected load point to obtain actual measurement performance parameters of the unit, wherein the operation interval of the unit load is 50-100% THA, 3-6 load points are selected in the operation interval of each unit load, the actual measurement test of the operation parameters is performed under each selected load point according to test standards, the actual measurement performance parameters of the unit comprise unit body performance, pipeline system performance and related auxiliary machine performance, and the actual measurement test of the parameters comprises the following steps: under the selected load points, each load point is subjected to 1 hour, main and auxiliary equipment is normally put into operation in a test, data are recorded, performance parameter calculation is carried out, and unit operation actual measurement performance parameters are obtained, wherein the unit body performance is high, medium and low pressure cylinder efficiency, each steam extraction section stage efficiency and flow pressure ratio coefficient, the pipeline system performance is steam extraction pipeline pressure loss, the related auxiliary equipment performance is heater performance and pump performance, the heater performance is the upper end difference and the lower end difference of the heater, and the pump performance is pump enthalpy rise;
2) According to the obtained actual measurement performance parameters of the unit operation and the variable working condition theory of the steam turbine, a unit thermoelectric characteristic calculation model is established through unit heat balance correction calculation, and full working condition modeling simulation calculation is carried out on the unit heating working conditions to obtain thermoelectric characteristics of each heating working condition of the unit, and the method comprises the following steps: selecting a plurality of industrial steam extraction flow values in an industrial steam extraction range, respectively setting different main steam flow values and heating steam extraction flow values under the selected industrial steam extraction flow values as heating working conditions, substituting heating working condition setting data into a unit thermoelectric characteristic calculation model for simulation calculation to obtain thermoelectric characteristics of each heating working condition;
3) According to the calculation result of thermoelectric characteristics of each heat supply working condition of the unit, obtaining the peak regulation upper limit and the peak regulation lower limit of the unit under different heat supply states, comprising: and setting different heating extraction steam quantities as heating states under the selected industrial extraction steam quantity to obtain peak regulation upper limit and peak regulation lower limit under each heating state.
2. The method for determining the peak regulation capacity of a heating unit based on measured performance parameters according to claim 1, wherein the range of main steam flow is from the lowest steady combustion flow of a boiler to the maximum evaporation capacity, a primary steam flow is set according to integers every certain value, the range of industrial steam extraction is from 0t/h to the maximum industrial steam extraction, a primary industrial steam extraction is set according to integers every certain value, the range of heating steam extraction is from 0t/h to the maximum heating steam extraction, a primary heating steam extraction is set according to integers every certain value, and 200-500 heating condition data are selected for unit thermoelectric characteristic calculation model simulation calculation.
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| CN112377985B (en) * | 2020-10-10 | 2022-02-01 | 湖南大唐先一科技有限公司 | Heat supply unit peak regulation lower limit evaluation method and system based on feedback neural network |
| CN112348696B (en) * | 2020-10-10 | 2024-03-22 | 湖南大唐先一科技有限公司 | BP neural network-based heating unit peak regulation upper limit evaluation method and system |
| CN113095623B (en) * | 2021-03-12 | 2022-08-05 | 国网河北能源技术服务有限公司 | Peak regulation capacity evaluation method for double-extraction heat supply unit |
| CN113033103B (en) * | 2021-03-30 | 2023-04-21 | 吉林松花江热电有限公司 | Method for determining heat consumption curve of turbine unit containing two sections of extraction steam |
| CN113822496B (en) * | 2021-10-27 | 2024-05-31 | 浙江英集动力科技有限公司 | Multi-unit thermal power plant heat supply mode and parameter online optimizing method |
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