CN115061000A - Method for correcting power consumption of air feeder in calculation of power consumption of unit thermal power plant - Google Patents
Method for correcting power consumption of air feeder in calculation of power consumption of unit thermal power plant Download PDFInfo
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Abstract
The invention discloses a method for correcting the power consumption of a blower in the power consumption calculation of a thermal power plant of a unit, which comprises the following steps: a. calculating a correction factor f of the atmospheric temperature to the power consumption of the blower according to the experimental atmospheric temperature and the design atmospheric temperature 1 (ii) a b. Calculating a correction factor f of the specific air flow to the power consumption of the blower according to the coal quality and the actually measured excess air coefficient 2 (ii) a c. Calculating a correction factor f of boiler input heat to blower power consumption according to the actually measured boiler efficiency and coal calorific value 3 (ii) a d. According to the exhaust steam pressure of the steam turbine, calculating a correction factor f of the exhaust steam pressure to the power consumption of the blower 4 (ii) a f. According to the number of ageing months of the steam turbine, calculating the ageing pair blower of the steam turbineCorrection factor f for power consumption 5 (ii) a g. Calculating the power consumption of the corrected air blower by using each correction factor and the actually measured power consumption; h. each correction factor is selected according to the purpose of the test. The invention is used for correcting the power consumption of the air feeder, and the corrected power consumption can reflect the real performance of equipment and units under the corresponding test purpose.
Description
Technical Field
The invention belongs to the field of thermal performance tests of generating sets, and particularly relates to a method for correcting the power consumption of a blower in the power consumption calculation of a generating set thermal power unit.
Background
The station power consumption is an index reflecting the power consumption of the auxiliary equipment of the unit, and factors influencing the station power consumption of the unit mainly comprise the following components in addition to the performance of the unit power consumption: (1) external conditions, such as coal type change, environmental temperature change and the like, which deviate from the design values, have great influence on the energy consumption of equipment such as a blower, a fan, a water feeding pump and the like; (2) operating conditions, such as operating mode and operating parameter settings, deviate from design (or guaranteed) operating condition requirements, can also affect auxiliary equipment energy consumption indicators to varying degrees.
In all station service electrical equipment, the factor that influences forced draught blower actual measurement power consumption is comparatively complicated, and the influence factor and the influence law that mainly include are:
(1) the temperature of the atmosphere. When the atmospheric temperature rises, the atmospheric density is reduced, the same quality air is output, and the power consumption of the air feeder is correspondingly increased;
(2) the air volume of the blower. The air volume of the air blower is influenced by coal quality and a boiler combustion excess air coefficient, the theoretical air volume of the air blower can be evaluated by adopting specific air flow, and when the specific air flow is increased, the power consumption of the air blower is correspondingly increased;
(3) the boiler inputs heat. When the boiler input heat is improved due to the improvement of the boiler efficiency or the improvement of the coal heat value, the coal quantity required by the same heat output of the boiler is reduced, the air quantity of the air feeder is reduced, and the power consumption of the air feeder is correspondingly reduced;
(4) the steam turbine discharge pressure. When the exhaust pressure of a steam turbine rises along with the change of environmental conditions and the output power of a unit is constant, the output heat of a boiler can be obviously increased, so that the required coal quantity can be increased, the air quantity of an air feeder can be increased, and the power consumption of the air feeder can be correspondingly increased;
(5) and (5) aging the performance of the steam turbine. According to objective rules, the heat rate of the steam turbine gradually increases with the increase of the operation time, which is called the performance aging of the steam turbine. Along with the increase of the operation time, under the condition that the unit output power is constant, the boiler output heat can be gradually increased due to the continuous aging of the performance of the steam turbine, the needed coal quantity can be increased along with the aging of the steam turbine, the primary air quantity for conveying the pulverized coal can be increased, and the power consumption of the air feeder can be correspondingly increased.
Based on the above analysis, it is important to correct the above influence factors when evaluating the power consumption of the blower. However, none of the currently published documents fully considers the calculation formula or calculation method for correcting the above factors. Therefore, it is very important to discuss the method for correcting and calculating the power consumption of the blower in the power consumption calculation of the plant.
Disclosure of Invention
The invention aims to provide a method for correcting the power consumption of a blower in the power consumption calculation of a thermal power plant of a unit.
In order to realize the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for correcting the power consumption of a blower in the power consumption calculation of a thermal power plant of a unit adopts a formula (1) to calculate the corrected power consumption of the blower:
P FDF_corr ＝P FDF_m +ΔP FDF (1)
in the formula: p FDF_corr kW is corrected power consumption of the air feeder; p is FDF_m Actual measurement of the power consumption of the blower, kW; delta P FDF Is the power consumption correction of the air feeder, kW;
blower power consumption correction amount Δ P in formula (1) FDF The calculation is performed using equation (2):
ΔP FDF ＝P FDF_m ×f 1 ×f 2 ×f 3 ×f 4 ×f 5 ×f 6 -P FDF_m (2)
in the formula: delta P FDF Is the power consumption correction of the air feeder, kW; p is FDF_m Actual measurement of the power consumption value, kW, of the blower is carried out; f. of 1 A correction factor for the power consumption of the blower for the atmospheric temperature; f. of 2 A correction factor of the fan flow to the blower power consumption is obtained; f. of 3 The correction factor of the boiler input heat to the power consumption of the blower; f. of 4 A correction factor of the steam turbine exhaust pressure to the power consumption of the air feeder; f. of 5 Correcting factors for the power consumption of the blower for the performance aging of the steam turbine; f. of 6 Other correction factors influencing the power consumption of the air feeder;
atmospheric temperature versus blower in the above equation (2)Correction factor f for power consumption 1 The calculation is performed using equation (3):
in the formula: t is ref Designing an atmospheric reference temperature, K, for an absolute boiler; t is a unit of t Absolute test atmospheric temperature, K; t is t ref Designing an atmospheric reference temperature (DEG C) for the boiler; t is t t Test atmospheric temperature, deg.C;
correction factor f of blower flow to blower power consumption in formula (2) 2 The calculation is performed using equation (4):
in the formula: sa (Sa) d The air preheater outlet specific air flow rate is kg/kJ based on the designed coal and the actually measured excess air coefficient condition; sa (Sa) t The specific air flow at the outlet of the air preheater is kg/kJ based on the test coal and the actually measured excess air coefficient; wherein, Sa d And Sa t The calculation is made with reference to the standard ASME PTC 4.
The invention is further improved in that the correction factor f of boiler input heat to blower power consumption in formula (2) 3 The calculation is performed using equation (5):
in the formula: LHV t kJ/kg for low-level calorific value of test coal; LHV d Designing the low-level calorific value of coal, kJ/kg; eta b_t Actual boiler efficiency,%; eta b_d Design boiler efficiency,%.
The invention is further improved in that the correction factor f of the steam exhaust pressure of the steam turbine to the power consumption of the blower in the formula (2) 4 The calculation is performed using equation (6):
in the formula: p b_t Measuring the exhaust pressure of the steam turbine, kPa; p b_d Designing the exhaust pressure of a steam turbine, namely kPa; and k is the influence coefficient of the steam turbine exhaust pressure on the heat consumption rate of the steam turbine,%/kPa.
A further improvement of the present invention is that the coefficient of influence k of the turbine exhaust pressure on the turbine heat rate in equation (6) is examined from a graph of the back pressure-to-heat rate correction provided by the turbine manufacturer or obtained by performing a turbine variable back pressure characteristic test.
The invention is further improved in that the correction factor f of the performance aging of the steam turbine in the formula (2) to the power consumption of the blower 5 The calculation is performed using equation (7):
in the formula: m is the number of operating months before the test from the first steam admission of the steam turbine; b is the designed output power of the steam turbine, MW; c is rated main steam pressure, MPa.
A further development of the invention consists in the correction term f referred to in equation (2) 1 To have to correct the term, f 2 、f 3 、f 4 、f 5 And is selected according to different test purposes.
The invention is further improved in that (a) if the unit performance index is compared with the design guarantee value, the unit performance acceptance test after production is carried out, f 2 ～f 5 All need to be corrected; (b) if the unit performance test is carried out for obtaining the current actual performance index of the unit under the design coal quality, f 2 、f 3 、f 4 To be corrected, f 5 1 is ═ 1; (c) if the unit performance test is carried out for obtaining the actual performance index of the unit under the current operation coal quality, f 1 、f 4 Is corrected f 2 ＝1、f 3 ＝1、f 5 1 is ═ 1; (d) if it is, thenPerformance test carried out to obtain performance index of blower equipment under design condition, f 1 ～f 5 All need to be corrected.
A further improvement of the invention is that the boiler design atmospheric reference temperature t in equation (3) ref The data are checked from "boiler thermodynamic calculation book" provided by a boiler manufacturer.
The invention has at least the following beneficial technical effects:
in the power consumption test calculation for the thermal power plant, the method can be used for correcting 6 factors (atmospheric temperature, air quantity of the air feeder, actually measured boiler efficiency, coal low calorific value, steam turbine exhaust pressure and steam turbine aging) influencing the power consumption of the air feeder to design values according to different test purposes, so that the obtained power consumption of the air feeder and the power consumption for the plant can reflect the real performances of the plant and equipment under the corresponding test purposes.
Drawings
FIG. 1 is a graph of typical turbine heat rate versus turbine discharge pressure.
Detailed Description
The following describes a method for correcting the power consumption of the blower in calculating the power consumption of the thermal power plant of the unit in detail by combining an example.
The invention provides a method for correcting the power consumption of a blower in the power consumption calculation of a thermal power plant of a unit, which comprises the following steps:
calculating the corrected power consumption of the blower by adopting a formula (1):
P FDF_corr ＝P FDF_m +ΔP FDF (1)
in the formula: p FDF_corr kW is the corrected power consumption of the air feeder; p FDF_m Actual measurement of the power consumption of the blower, kW; delta P FDF kW is the power consumption correction of the blower.
Blower power consumption correction amount Δ P in formula (1) FDF The calculation is performed using equation (2):
ΔP FDF ＝P FDF_m ×f 1 ×f 2 ×f 3 ×f 4 ×f 5 ×f 6 -P FDF_m (2)
in the formula: delta P FDF Is the power consumption correction of the air feeder, kW; p FDF_m Actual measurement of the power consumption value, kW, of the blower is carried out; f. of 1 A correction factor for the power consumption of the blower for the atmospheric temperature; f. of 2 A correction factor of the fan flow to the blower power consumption; f. of 3 The correction factor of the boiler input heat to the power consumption of the blower; f. of 4 A correction factor of the steam turbine exhaust pressure to the power consumption of the air feeder; f. of 5 Correcting factors for the power consumption of the blower for the performance aging of the steam turbine; f. of 6 And other correction factors influencing the power consumption of the blower.
The correction factor f of the atmospheric temperature to the blower power consumption in the above formula (2) 1 The calculation is performed using equation (3):
in the formula: t is ref Designing an atmospheric reference temperature, K, for an absolute boiler; t is t Absolute test atmospheric temperature, K; t is t ref Designing an atmospheric reference temperature (DEG C) for the boiler; t is t t For testing atmospheric temperature, DEG C.
Boiler design atmospheric reference temperature t in equation (3) ref The data are checked from "boiler thermodynamic calculation book" provided by a boiler manufacturer.
Correction factor f of blower flow to blower power consumption in formula (2) 2 The calculation is performed using equation (4):
in the formula: sa (Sa) d The air preheater outlet specific air flow rate is kg/kJ based on the designed coal and the actually measured excess air coefficient condition; sa (Sa) t The specific air flow at the outlet of the air preheater is kg/kJ based on the test coal and the measured excess air coefficient. Wherein, Sa d And Sa t The calculation is made with reference to the standard ASME PTC 4.
Correction factor f of boiler input heat to blower power consumption in formula (2) 3 The calculation is performed using equation (5):
in the formula: LHV t kJ/kg for low-level calorific value of test coal; LHV d Designing the low-level calorific value of coal, kJ/kg; eta b_t Actual boiler efficiency,%; eta b_d Design boiler efficiency,%.
Correction factor f of steam turbine exhaust pressure to blower power consumption in formula (2) 4 The calculation is performed using equation (6):
in the formula: p b_t Measuring the exhaust pressure of the steam turbine, kPa; p b_d Designing the exhaust pressure of a steam turbine, namely kPa; and k is the influence coefficient of the steam turbine exhaust pressure on the heat consumption rate of the steam turbine,%/kPa.
The coefficient of influence k of the turbine exhaust pressure on the turbine heat rate in the equation (6) is obtained by examining a back pressure-to-heat rate correction graph provided by a turbine manufacturer as shown in fig. 1 or by performing a turbine variable back pressure characteristic test.
Correction factor f of steam turbine performance aging to blower power consumption in formula (2) 5 The calculation is performed using equation (7):
in the formula: m is the number of operating months from the first steam admission of the steam turbine to the time before the test; b is the designed output power of the steam turbine, MW; c is rated main steam pressure, MPa.
Correction term f referred to in formula (2) 1 To have to correct the term, f 2 、f 3 、f 4 、f 5 Can be properly selected according to different test purposes: (a) if the unit performance index (net heat rate, net output power, power supply coal consumption, station power and station power consumption index) which can be compared with the design guaranteed value is obtained, the unit after-production performance acceptance test is carried out, f 2 ～f 5 All the parts need to be corrected; (b) if the unit performance test is carried out for obtaining the current actual performance indexes (net heat rate, net output power, power supply coal consumption, station electric power and station electric power consumption) under the unit design coal quality, f 2 (without correction of boiler efficiency), f 3 、f 4 Is corrected f 5 1 is ═ 1; (c) if the unit performance test is carried out for obtaining the actual performance indexes (net heat consumption rate, net output power, power supply coal consumption, station electric power and station electric power consumption) of the unit under the current operation coal quality, f 1 、f 4 Is corrected f 2 ＝1、f 3 ＝1、f 5 1 is ═ 1; (d) if it is a performance test for obtaining performance index (blower power consumption) of blower equipment under design conditions, f 1 ～f 5 All need to be corrected.
Other correction factors f affecting the blower power consumption referred to in equation (2) 6 The calculation method is determined by negotiation of all parties participating in the test according to the actual running special condition of the unit. Whether or not f is determined among the three test objects (a), (b) and (c) 6 The correction is needed to be carried out according to the negotiation and determination of each party participating in the test under the actual operation special condition of the unit.
Examples illustrate that:
as shown in table 1, the example is that the overall performance acceptance test is performed on a 660MW coal-fired thermal power unit, the power consumption of the plant needs to be corrected and calculated, and thus the power consumption of the blower needs to be corrected correspondingly. Examples belong to the experimental object (a) in claim 10, thus influencing the correction factor f of the blower power consumption 1 ～f 5 Correction calculations are required.
The test unit is provided with 2 air blowers, and the running mode of the air blowers is 2 running completely under the 100% TMCR test working condition. During the test, the output power of the generator of the unit is 686.380MW, the total power consumption value of auxiliary machines of the unit is 56950.7kW, and the total power consumption of 2 blowers is 1936.2 kW.
In the example, the calculation result shows that the power consumption correction of the air feeder is 237.3kW, the power consumption of the air feeder after correction is 2173.5kW, and the total plant power consumption after power consumption correction of the air feeder is 57188.0kW by correcting the atmospheric temperature, the air volume of the air feeder, the actually measured boiler efficiency, the coal low calorific value, the steam turbine exhaust pressure, and the steam turbine aging to the design values.
TABLE 1 blower Power consumption correction calculation example
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A method for correcting the power consumption of a blower in the power consumption calculation of a unit thermal power plant is characterized in that the corrected power consumption of the blower is calculated by adopting a formula (1):
P FDF_corr ＝P FDF_m +ΔP FDF (1)
in the formula: p FDF_corr kW is corrected power consumption of the air feeder; p FDF_m kW is measured for actually measuring the power consumption of the air feeder; delta P FDF Is the power consumption correction of the air feeder, kW;
blower power consumption correction amount Δ P in formula (1) FDF The calculation is performed using equation (2):
ΔP FDF ＝P FDF_m ×f 1 ×f 2 ×f 3 ×f 4 ×f 5 ×f 6 -P FDF_m (2)
in the formula: delta P FDF Is the power consumption correction of the air feeder, kW; p FDF_m Actual measurement of the power consumption value, kW, of the blower is carried out; f. of 1 A correction factor for the power consumption of the blower for the atmospheric temperature; f. of 2 A correction factor of the fan flow to the blower power consumption; f. of 3 The correction factor of the boiler input heat to the power consumption of the blower; f. of 4 A correction factor of the steam turbine exhaust pressure to the power consumption of the air feeder; f. of 5 Correcting factors for the power consumption of the blower for the performance aging of the steam turbine; f. of 6 Other correction factors influencing the power consumption of the blower;
the correction factor f of the atmospheric temperature to the blower power consumption in the above formula (2) 1 The calculation is performed using equation (3):
in the formula: t is ref Designing an atmospheric reference temperature, K, for an absolute boiler; t is t Absolute test atmospheric temperature, K; t is t ref Designing an atmospheric reference temperature (DEG C) for the boiler; t is t t Test atmospheric temperature, deg.C;
correction factor f of blower flow to blower power consumption in equation (2) 2 The calculation is performed using equation (4):
in the formula: sa (Sa) d The air preheater outlet specific air flow rate is kg/kJ based on the designed coal and the actually measured excess air coefficient condition; sa (Sa) t The air preheater outlet specific air flow rate is kg/kJ based on the test coal and the actually measured excess air coefficient condition; wherein, Sa d And Sa t The calculation is made with reference to the standard ASME PTC 4.
2. The auxiliary power of the thermal power generating unit of claim 1The method for correcting the power consumption of the blower in the rate calculation is characterized in that a correction factor f of boiler input heat to the power consumption of the blower in a formula (2) 3 The calculation is performed using equation (5):
in the formula: LHV t kJ/kg for low-level calorific value of test coal; LHV d Designing the low-level calorific value of coal, kJ/kg; eta b_t Actual boiler efficiency,%; eta b_d Design boiler efficiency (%).
3. The method for correcting the power consumption of the blower in the power consumption calculation of the thermal power plant of the unit thermal power plant as claimed in claim 1, wherein the correction factor f of the steam exhaust pressure of the turbine to the power consumption of the blower in the formula (2) 4 The calculation is performed using equation (6):
in the formula: p b_t Measuring the exhaust pressure of the steam turbine, kPa; p b_d Designing the exhaust pressure of a steam turbine, namely kPa; and k is the influence coefficient of the steam turbine exhaust pressure on the heat consumption rate of the steam turbine,%/kPa.
4. The method for correcting the power consumption of the blower in calculating the power consumption of the plant of the thermal power generating unit of the unit as set forth in claim 3, wherein the coefficient k of influence of the steam turbine discharge pressure on the heat consumption of the steam turbine in the formula (6) is examined from a graph of the back pressure-to-heat consumption correction provided by a steam turbine plant or is obtained by performing a test of a variable back pressure characteristic of the steam turbine.
5. The method for correcting the power consumption of the blower in the power consumption calculation of the thermal power plant of the unit thermal power plant as claimed in claim 1, wherein the power consumption of the blower is corrected by the aging of the performance of the steam turbine in the formula (2)Correction factor f 5 The calculation is performed using equation (7):
in the formula: m is the number of operating months before the test from the first steam admission of the steam turbine; b is the designed output power of the steam turbine, MW; c is rated main steam pressure, MPa.
6. The method for correcting the power consumption of the blower in calculating the power consumption of the thermal power plant of the unit according to claim 1, wherein the correction term f referred to in the formula (2) 1 To have to correct the term, f 2 、f 3 、f 4 、f 5 And is selected according to different test purposes.
7. The method for correcting the power consumption of the blower in the plant power consumption calculation of the thermal power generating unit of the unit as claimed in claim 6, wherein (a) if the performance of the unit is tested after production to obtain a unit performance index comparable to the design assurance value, f 2 ～f 5 All need to be corrected; (b) if the unit performance test is carried out for obtaining the current actual performance index of the unit under the design coal quality, f 2 、f 3 、f 4 Is corrected f 5 1 is ═ 1; (c) if the unit performance test is carried out for obtaining the actual performance index of the unit under the current operation coal quality, f 1 、f 4 Is corrected f 2 ＝1、f 3 ＝1、f 5 1 is ═ 1; (d) if it is a performance test for obtaining performance indexes of the blower equipment under design conditions, f 1 ～f 5 All need to be corrected.
8. The method for correcting the power consumption of the blower in the calculation of the power consumption rate of the thermal power plant of the unit according to claim 1, wherein the design atmospheric reference temperature t of the boiler in the formula (3) ref The data are checked from "boiler thermodynamic calculation book" provided by a boiler manufacturer.
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