A method for correcting air cooling fan power consumption in power consumption calculation of thermal power unit auxiliary power

Abstract

The application discloses a kind of air cooling fan electric consumption correction calculation method in thermal power generating unit auxiliary power consumption calculation, comprising: a, according to test atmospheric pressure and temperature, air cooling system design reference atmospheric pressure and temperature, the correction factor f1 of atmospheric pressure and temperature to air cooling fan electric consumption is calculated;B, according to test air cooling fan rotating speed, the correction factor f2 of rotating speed to air cooling fan electric consumption is calculated;C, according to measured steam turbine exhaust flow, the correction factor f3 of exhaust flow to air cooling fan electric consumption is calculated;D, according to measured steam turbine enthalpy, the correction factor f4 of exhaust enthalpy to air cooling fan electric consumption is calculated;F, according to the degree of heat transfer tube bundle contamination, the correction factor f5 of heat transfer coefficient to air cooling fan electric consumption is calculated;G, using each correction factor and measured electric consumption, the corrected air cooling fan electric consumption is calculated.The application corrects air cooling fan electric consumption, and the corrected electric consumption can reflect the real performance of equipment and unit under corresponding test purpose.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of thermal performance test of generator set, and particularly relates to a method for correcting and calculating electric power consumption of air cooling fan in calculation of auxiliary power consumption of thermal power generator set. BACKGROUND

[0002] Auxiliary power consumption is an index reflecting power consumption of auxiliary equipment of the unit, and factors affecting the auxiliary power consumption of the unit mainly include, besides its own performance, (1) external conditions, such as atmospheric pressure and temperature variation, and when these conditions deviate from the design value, they will have a great influence on the power consumption of devices such as air cooling fan, fan and feed water pump; (2) operating conditions, such as deviation of operating mode and operating parameter setting from the design (or guarantee) working condition requirement, which will also affect the auxiliary equipment power consumption index to different degrees.

[0003] Among all auxiliary power consumption devices, the factors affecting the measured electric power consumption of the air cooling fan are relatively complex, and the main influencing factors and influencing rules are as follows:

[0004] (1) Atmospheric pressure and temperature. When the atmospheric pressure and temperature change, the air density changes, the air mass flow of the air cooling fan changes at the same speed, and the electric power consumption of the air cooling fan changes accordingly;

[0005] (2) Air cooling fan speed. When the air cooling fan speed increases, the electric power consumption of the air cooling fan increases accordingly;

[0006] (3) Turbine exhaust flow. When the turbine exhaust flow increases, the air cooling fan speed increases to maintain the same exhaust pressure, and the electric power consumption of the air cooling fan increases accordingly;

[0007] (4) Turbine exhaust steam dryness. When the turbine exhaust steam dryness increases, the steam content in the exhaust increases under the same exhaust mass flow, the air cooling fan speed increases to maintain the same exhaust pressure, and the electric power consumption of the air cooling fan increases accordingly;

[0008] (5) Fouling of heat transfer tube bundle. When the air cooling system is operated for a long time, atmospheric dust, sewage and the like are deposited on the surface of the air cooling heat transfer tube bundle, resulting in fouling of the heat transfer tube bundle, which increases the heat transfer resistance. At this time, the air cooling fan speed increases to maintain the same exhaust pressure of the turbine, and the electric power consumption of the air cooling fan increases accordingly.

[0009] Based on the above analysis, it is very important to correct the above influencing factors when evaluating the electric power consumption of the air cooling fan. However, there is no complete calculation formula or calculation method for correcting the above factors in the currently published literature. Therefore, it is of great significance to explore the method for correcting and calculating the electric power consumption of the air cooling fan in the calculation of auxiliary power consumption. SUMMARY

[0010] The purpose of this invention is to provide a method for correcting the power consumption of air-cooled fans in the calculation of power consumption of thermal power units. In the experimental calculation of power consumption of thermal power units, this method can be used to correct the measured power consumption of air-cooled fans to the corresponding design conditions according to different test purposes.

[0011] To achieve the above objectives, the present invention employs the following technical solution:

[0012] A method for correcting the power consumption of air-cooled fans in the calculation of power consumption of thermal power units, using formula (1) to calculate the corrected power consumption of air-cooled fans:

[0013] (1)

[0014] In the formula: The corrected power consumption of the air-cooled fan is in kW; To measure the actual power consumption of the air-cooled fan, in kW; This is the power consumption correction for the air-cooled fan, in kW.

[0015] A further improvement of the present invention is that the power consumption correction amount of the air-cooled fan in formula (1) is... The calculation is performed using formula (2):

[0016] (2)

[0017] In the formula: Δ P PAF This is the power consumption correction for the air-cooled fan, in kW; P PAF_m The measured power consumption of the air-cooled fan is in kW. f 1 is the correction factor for atmospheric pressure and temperature on the power consumption of air-cooled fans; f 2 is the correction factor for the power consumption of the air-cooled fan due to the fan speed; f 3 is the correction factor for the power consumption of the air-cooled fan due to the steam turbine exhaust flow rate; f 4 is the correction factor for the power consumption of the air-cooled fan due to the enthalpy of the steam turbine exhaust; f 5 is the correction factor for the power consumption of the air-cooled fan due to the fouling of the heat transfer tube bundle.

[0018] A further improvement of this invention lies in the correction factors for atmospheric pressure and temperature on the power consumption of the air-cooled fan in formula (2). f 1. Calculate using formula (3):

[0019] (3)

[0020] In the formula: p ref Design atmospheric pressure (kPa) for air-cooled fans; pt The atmospheric pressure was measured in kPa. t ref The design ambient temperature for the air-cooled fan is ℃; t t The ambient temperature for the test was [temperature value] °C. n The exponent of the air-side drag law is taken as 0.33.

[0021] A further improvement of this invention is that the design atmospheric pressure of the air-cooled fan in formula (3) is... p ref and temperature t ref Obtain it from the "Air Cooling System Design Parameter Table" provided by the air cooling system supplier.

[0022] A further improvement of this invention is that the fan speed in formula (2) is a correction factor for the power consumption of the air-cooled fan. f 2. Calculate using formula (4):

[0023] (4)

[0024] In the formula: F t The test fan speed is measured in Hz. F d The fan speed is specified in Hz.

[0025] A further improvement of this invention lies in the correction factor for the power consumption of the air-cooled fan in formula (2) based on the turbine exhaust flow rate. f 3. Calculate using formula (5):

[0026] (5)

[0027] In the formula: M t To measure the actual exhaust steam flow rate of the steam turbine, t / h; M d The design turbine exhaust flow rate is given in t / h; where, M t The calculations were performed in accordance with the ASME PTC 6 comprehensive test method.

[0028] A further improvement of this invention lies in the correction factor of the turbine exhaust enthalpy for the power consumption of the air-cooled fan in formula (2). f 4. Calculate using formula (6):

[0029] (6)

[0030] In the formula: H t The measured enthalpy of the steam turbine exhaust is in kJ / kg.H d To design the exhaust enthalpy of the steam turbine, t / h; where, H t The calculations were performed in accordance with the ASME PTC 6 comprehensive test method.

[0031] A further improvement of this invention lies in the correction factor for the power consumption of the air-cooled fan caused by heat transfer tube bundle fouling in formula (2). f 5. Calculate using formula (7):

[0032] (7)

[0033] In the formula: K t The heat transfer coefficient of the heat transfer unit under test conditions is W / (m²). 2 ·K); K d The heat transfer coefficient of the heat transfer unit under design conditions is given in W / (m²). 2 ·K); where, K t Calculations are performed with reference to DL / T 552. K d Calculations are performed based on the design parameters of the air-cooled system.

[0034] A further improvement of the present invention lies in the modification of the items involved in formula (2). f 1. f 2. f 3. f 4. f 5. Appropriate selection may be made according to different test objectives: (a) If the test is a post-commissioning performance acceptance test of the unit to obtain unit performance indicators that can be compared with the design guarantee value, f 1. f 2. f 5. Make corrections accordingly. f 3=1、 f 4=1; (b) If the unit performance test is conducted to obtain the unit's current actual performance indicators, f 1. f 2. To be corrected. f 3=1、 f 4=1、 f 5=1; (c) If the performance test is conducted to obtain the performance indicators of the air-cooled fan equipment under design conditions, f 1~ f 5. All corrections are required.

[0035] The present invention has at least the following beneficial technical effects:

[0036] In the calculation of power consumption for thermal power units, this method provides a correction calculation method that can correct the five factors affecting the power consumption of air-cooled fans (atmospheric pressure and temperature, fan speed, turbine exhaust flow rate, turbine exhaust enthalpy, and heat transfer tube bundle fouling) to the design value according to different test objectives. This ensures that the obtained power consumption of air-cooled fans and power consumption for the entire plant can reflect the true performance of the unit and equipment under the corresponding test objectives. Attached Figure Description

[0037] Figure 1 This is a typical curve showing the relationship between power consumption and fan speed of an air-cooled fan. Detailed Implementation

[0038] The following example provides a more detailed explanation of the air-cooled fan power consumption correction calculation method in the calculation of power consumption for thermal power units according to the present invention.

[0039] The present invention provides a method for correcting the power consumption of air-cooled fans in the calculation of power consumption of thermal power units, comprising the following steps: calculating the corrected power consumption of air-cooled fans using formula (1):

[0040] (1)

[0041] In the formula: The corrected power consumption of the air-cooled fan is in kW; To measure the actual power consumption of the air-cooled fan, in kW; This is the power consumption correction for the air-cooled fan, in kW.

[0042] The power consumption correction for the air-cooled fan in formula (1) The calculation is performed using formula (2):

[0043] (2)

[0044] In the formula: Δ P PAF This is the power consumption correction for the air-cooled fan, in kW; P PAF_m The measured power consumption of the air-cooled fan is in kW. f 1 is the correction factor for atmospheric pressure and temperature on the power consumption of air-cooled fans; f 2 is the correction factor for the power consumption of the air-cooled fan due to the fan speed; f 3 is the correction factor for the power consumption of the air-cooled fan due to the steam turbine exhaust flow rate; f 4 is the correction factor for the power consumption of the air-cooled fan due to the enthalpy of the steam turbine exhaust; f 5 is the correction factor for the power consumption of the air-cooled fan due to the fouling of the heat transfer tube bundle.

[0045] The correction factors for atmospheric pressure and temperature on the power consumption of air-cooled fans in formula (2) f1. Calculate using formula (3):

[0046] (3)

[0047] In the formula: p ref Design atmospheric pressure (kPa) for air-cooled fans; p t The atmospheric pressure was measured in kPa. t ref The design ambient temperature for the air-cooled fan is ℃; t t The ambient temperature for the test was [temperature value] °C. n The exponent of the air-side drag law is taken as 0.33.

[0048] The design atmospheric pressure of the air-cooled fan in formula (3) p ref and temperature t ref Obtain it from the "Air Cooling System Design Parameter Table" provided by the air cooling system supplier.

[0049] The correction factor for the power consumption of the air-cooled fan in formula (2) is the fan speed. f 2. Calculate using formula (4):

[0050] (4)

[0051] In the formula: F t The test fan speed is measured in Hz. F d The fan speed is specified in Hz.

[0052] The correction factor for the power consumption of the air-cooled fan in formula (2) is the turbine exhaust flow rate. f 3. Calculate using formula (5):

[0053] (5)

[0054] In the formula: M t To measure the actual exhaust steam flow rate of the steam turbine, t / h; M d The design turbine exhaust flow rate is given in t / h. Among them, M t The calculations were performed in accordance with the ASME PTC 6 comprehensive test method.

[0055] The correction factor for the power consumption of the air-cooled fan based on the turbine exhaust enthalpy in formula (2) f 4. Calculate using formula (6):

[0056] (6)

[0057] In the formula: H t The measured enthalpy of the steam turbine exhaust is in kJ / kg. H d To design the exhaust enthalpy of the steam turbine, t / h. Among them, H t The calculations were performed in accordance with the ASME PTC 6 comprehensive test method.

[0058] The correction factor for the power consumption of the air-cooled fan due to heat transfer tube bundle fouling in formula (2) f 5. Calculate using formula (7):

[0059] (7)

[0060] In the formula: K t The heat transfer coefficient of the heat transfer unit under test conditions is W / (m²). 2 ·K); K d The heat transfer coefficient of the heat transfer unit under design conditions is given in W / (m²). 2 ·K). Among them, K t Calculations are performed with reference to DL / T 552. K d Calculations are performed based on the design parameters of the air-cooled system.

[0061] Correction items involved in formula (2) f 1. f 2. f 3. f 4. f 5. Appropriate selection may be made according to different test objectives: (a) If the test is a post-commissioning performance acceptance test of the unit to obtain unit performance indicators (net heat rate, net output power, coal consumption for power supply, power consumption for plant use, power consumption for plant use) that can be compared with the design guarantee value, f 1. f 2. f 5. Make corrections accordingly. f 3=1、 f 4=1; (b) If the unit performance test is conducted to obtain the unit's current actual performance indicators (net heat rate, net output power, coal consumption for power supply, power consumption for plant use, power consumption for plant use), f 1. f 2. To be corrected. f 3=1、 f 4=1、 f5=1; (c) If the performance test is conducted to obtain the performance indicators (power consumption of the air-cooled fan) of the air-cooled fan equipment under design conditions, f 1~ f 5. All corrections are required.

[0062] Example illustration:

[0063] As shown in Table 1, the example is a comprehensive performance acceptance test of a 1000MW coal-fired power unit. It requires a correction calculation for the unit's power consumption, thus necessitating a corresponding correction for the air-cooled fan power consumption. This example falls under test objective (c), therefore the correction factor affecting the air-cooled fan power consumption is... f 1~ f All 5 require correction calculations.

[0064] The test unit was equipped with 80 air-cooled fans. Under the 100% TMCR test conditions, all 80 air-cooled fans were in operation. During the test, the generator output power was 1022.325MW, the total auxiliary power consumption was 61425.5kW, and the total power consumption of the 80 air-cooled fans was 3726.3kW.

[0065] In this example, the calculation results show that by correcting the test atmospheric pressure and temperature, air-cooled fan speed, turbine exhaust flow rate, turbine exhaust enthalpy, and heat transfer coefficient of the heat transfer tube bundle to the design values, the corrected power consumption of the air-cooled fan is -235.6kW, the corrected power consumption of the air-cooled fan is 3490.7kW, and the total plant power consumption after the power consumption of the air-cooled fan is corrected is 61189.9kW.

[0066] Table 1 Example of Calculation for Correction of Power Consumption of Air-Cooled Fan

[0067]

[0068] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for correcting the power consumption of air-cooled fans in the calculation of power consumption for thermal power units, characterized in that, The corrected power consumption of the air-cooled fan is calculated using formula (1): （1） In the formula: The corrected power consumption of the air-cooled fan is in kW; To measure the actual power consumption of the air-cooled fan, in kW; This is the power consumption correction for the air-cooled fan, in kW; The power consumption correction for the air-cooled fan in formula (1) The calculation is performed using formula (2): （2） In the formula: Δ P PAF This is the power consumption correction for the air-cooled fan, in kW; P PAF_m The measured power consumption of the air-cooled fan is in kW. f 1 is the correction factor for atmospheric pressure and temperature on the power consumption of air-cooled fans; f 2 is the correction factor for the power consumption of the air-cooled fan due to the fan speed; f 3 is the correction factor for the power consumption of the air-cooled fan due to the steam turbine exhaust flow rate; The correction factors for atmospheric pressure and temperature on the power consumption of air-cooled fans in formula (2) f 1. Calculate using formula (3): （3） In the formula: p ref Design atmospheric pressure (kPa) for air-cooled fans; p t The atmospheric pressure was measured in kPa. t ref The design ambient temperature for the air-cooled fan is ℃; t t The ambient temperature for the test was [temperature value] °C. n The exponent of the air-side drag law is taken as 0.33; The correction factor for the power consumption of the air-cooled fan in formula (2) is the fan speed. f 2. Calculate using formula (4): （4） In the formula: F t The test fan speed is measured in Hz. F d The design fan speed is specified in Hz. The correction factor for the power consumption of the air-cooled fan in formula (2) is the turbine exhaust flow rate. f 3. Calculate using formula (5): （5） In the formula: M t To measure the actual exhaust steam flow rate of the steam turbine, t / h; M d The design turbine exhaust flow rate is given in t / h; where, M t The calculations were performed in accordance with the ASME PTC 6 comprehensive test method.

2. The method for correcting the power consumption of air-cooled fans in the calculation of power consumption for thermal power units as described in claim 1, characterized in that, The design atmospheric pressure of the air-cooled fan in formula (3) p ref and temperature t ref Obtain it from the "Air Cooling System Design Parameter Table" provided by the air cooling system supplier.

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