A method for correcting the power consumption of the coal unloading system in the overall performance test of a unit

Abstract

The present invention discloses a method for correcting the power consumption of the coal unloading system in the overall performance test of a unit, including an electricity consumption test for a typical ship coal unloading process once, and the steps are as follows: A. Record the relevant data of the coal unloading system; B. Determine the average power consumption value of the coal unloading system for unloading a unit mass of raw coal during the test; C. Determine the designed coal consumption required under specific working conditions of the test unit; D. Calculate the statistical value of the power consumption of the coal unloading system under specific working conditions; E. Calculate the power value of the coal unloading system during the overall test of the unit. The correction calculation steps in the overall performance test of the unit are as follows: F. Calculate the correction value of the coal unloading system to the measured net power of the unit; G. Calculate the corrected net power of the unit by the coal unloading system in the overall performance test of the unit. Using the method provided by the present invention, the measured value of the power consumption of the coal unloading system can be corrected to the statistical average value, which is helpful for comparing the overall performance test results of thermal power units with the guaranteed values.

Description

Technical Field

[0001] The invention belongs to the field of thermal performance tests of thermal power units, and particularly relates to a method for correcting the power consumption of a coal unloading system in an overall performance test of a unit. Background Art

[0002] In the overall performance test of a thermal power unit, in order to obtain the net heat consumption rate of the unit under specific operating conditions, it is necessary to correct the power consumption values of all auxiliary equipment to the unit design state or the annual average operating state. However, for some individual auxiliary systems, since they cannot operate during the test period, the power consumption values during the test period cannot represent the design power consumption or the annual average power consumption value of the system. Among them, the coal unloading system in a riverside or coastal power plant that uses shipborne raw coal belongs to this type of auxiliary system.

[0003] Since the single coal unloading volume of shipborne raw coal is large and the intermittent coefficient of the equipment operation of the shipborne coal unloading system is small (the actual operating time is short), it is difficult to directly measure and calculate its power consumption during the overall performance test of the unit, which often causes a deviation between the calculated overall performance index of the unit and the true value.

[0004] However, the designed power consumption of the equipment in the coal unloading system is large. If its power consumption is not accurately evaluated, it will have a significant impact on the accuracy of the overall performance test results of the unit. Therefore, correctly calculating the power consumption of the related equipment in this system is very important for correcting the power consumption of auxiliary equipment in the overall performance test of the unit. Summary of the Invention

[0005] The purpose of the invention is to provide a method for correcting the power consumption of a coal unloading system in an overall performance test of a unit. In the overall performance test of a thermal power unit, the method provided by the invention can correct the power consumption of the equipment in the coal unloading system of a power plant using shipborne raw coal to the design conditions.

[0006] To achieve the above purpose, the invention adopts the following technical solutions:

[0007] A method for correcting the power consumption of a coal unloading system in an overall performance test of a unit. The coal unloading system refers to all equipment related to the unloading and conveying of raw coal from the ship unloading terminal to the coal bunker using the shipborne coal transportation method. To correct and calculate the power consumption of the coal unloading system in the overall performance test of the unit, it is necessary to conduct a power consumption test of a typical shipborne coal unloading process independent of the overall performance test of the unit, obtain the average power consumption value of the coal unloading system for unloading a unit mass of raw coal using statistical methods, and use the statistical power consumption value of the coal unloading system to correct and calculate the net power of the unit test in the overall performance test of the unit.

[0008] A further improvement of the invention is that the specific implementation steps of the power consumption test of a typical shipborne coal unloading process are as follows:

[0009] A. Record the relevant operation data of the entire coal unloading system, respectively read the data values at the start and end of the coal unloading process test, and proceed to step B. The operation data to be recorded includes:

[0010] (a) The cumulative coal conveying volume M of the coal conveying belt i , t;

[0011] (b) The total incoming power meter value W of the 10kV / 6kV main inlet of the terminal system jetty_i , kWh;

[0012] (c) The total power meter value W of each coal conveying belt not included in the 10kV / 6kV main inlet of the terminal system conveyor_i , kWh;

[0013] (d) The total power meter value W of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main inlet of the terminal system aux_i , kWh;

[0014] B. According to the operation data during the power consumption test of the typical ship coal unloading process recorded in step A, determine the average power consumption value W of the coal unloading system per unit mass of raw coal unloaded during the test according to formula (1) total_av , and proceed to step C;

[0015] C. According to the designed boiler efficiency η b_design under specific operating conditions of the unit, the designed gross heat consumption rate HR g_design of the steam turbine under specific operating conditions, the designed auxiliary power consumption rate λ design of the unit under specific operating conditions, the designed gross power output P g_design of the generator under specific operating conditions, and the designed coal calorific value HV design , calculate the designed coal consumption M design required for the unit under specific operating conditions according to formula (2), and proceed to step D;

[0016]

[0017] Where: M design_coal is the designed coal consumption required for the test unit under specific operating conditions, t / h; HR g_design is the designed gross heat consumption rate of the steam turbine under specific operating conditions, kJ / (kWh); P g_design is the designed gross power output of the generator under specific operating conditions, kW; HV design is the designed coal calorific value, kJ / t; η b_design is the designed boiler efficiency under specific operating conditions, %; η p_design is the designed pipeline efficiency under specific operating conditions, %; λ design is the designed auxiliary power consumption rate under specific operating conditions, %;

[0018] D. Based on the average power consumption statistical value W of the coal unloading system per unit mass of raw coal obtained in step B total_av and the designed coal consumption M required under specific conditions of the test unit obtained in step C design_coal , calculate the statistical calculation value P of the power consumption of the coal unloading system under specific conditions statistic_coalhandling .

[0019] A further improvement of the present invention is that during the overall performance test of the unit, the coal unloading process of the ship proceeds normally or stops running completely. The power consumption correction calculation steps of the coal unloading system in the overall performance test of the unit are as follows:

[0020] E. Record the power consumption data of the coal unloading system in the overall performance test. The types of recorded data are the same as those required in step A, and synchronously record the test duration ΔT. According to the recorded data, calculate the measured power value of the coal unloading system during the overall test of the unit according to formula (4), and enter step F;

[0021]

[0022] In the formula: P coalhandling_test is the measured power consumption of the coal unloading system during the overall performance test of the unit, kW; W jetty_test_start is the total incoming power value of the 10kV / 6kV main inlet of the terminal system at the start of the test, kWh; W jetty_test_end is the total incoming power value of the 10kV / 6kV main inlet of the terminal system at the end of the overall performance test of the unit, kWh; W conveyor_test_start is the total power value of each coal conveying belt not included in the 10kV / 6kV main inlet of the terminal system at the start of the overall performance test of the unit, kWh; W conveyor_test_end is the total power value of each coal conveying belt not included in the 10kV / 6kV main inlet of the terminal system at the end of the overall performance test of the unit, kWh; W aux_test_start is the total power value of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main inlet of the terminal system at the start of the overall performance test of the unit, kWh; W aux_test_end is the total power value of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main inlet at the end of the overall performance test of the unit, kWh;

[0023] F. According to the statistical calculation value P of the power consumption of the coal unloading system under specific conditions obtained statistic_coalhandling and the measured power consumption P of the coal unloading system during the overall performance test of the unit obtained in step E coalhandling_test , calculate the correction value P of the measured net power of the unit by the coal unloading system according to formula (5) coalhandling_corr , and enter step G;

[0024] P coalhandling_corr = P total_coalhandling_test - Pstatistic_coalhandling (5)

[0025] Wherein: P coalhandling_corr is the correction value of the coal unloading system to the measured net power of the unit during the overall performance test of the unit, in kW;

[0026] G. According to the correction value P of the coal unloading system to the measured net power of the unit obtained in step F coalhandling_corr and the net power P measured during the overall performance test of the unit net_test , calculate the corrected net power P of the unit by the coal unloading system according to formula (5) net_corr , that is, complete the power consumption correction of the coal unloading system in the overall performance test of the unit;

[0027] P net_corr = P net_test + P coalhandling_corr (6)

[0028] Wherein: P net_corr is the corrected net power of the unit after the power consumption correction of the coal unloading system, in kW; P net_test is the measured net power of the unit, in kW.

[0029] A further improvement of the present invention is that the cumulative coal conveying volume M of the coal conveying belt collected in step A i , (b) the total incoming power meter reading W of the 10kV / 6kV main incoming line of the terminal system jetty_i , (c) the total power meter reading W of each coal conveying belt not included in the 10kV / 6kV main incoming line of the terminal system conveyor_i , (d) the total power meter reading W of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main incoming line of the terminal system aux_i are independent of each other in electrical wiring and measurement, and the recorded data are not mutually inclusive, and the recorded power consumption data include the power consumption of all equipment required for the design operation of the coal unloading system; if there is no power meter reading data for the unit in items (b), (c), and (d) above, the power consumption value of the recorded equipment and system can also be determined by integrating the product of the electrical power measurement data of the equipment and the recording time; if there is neither a power meter nor a wattmeter in the power plant data recording system for items (b), (c), and (d) above, the power consumption value of the recorded equipment and system can be determined by integrating the product of the current, voltage, and power factor of the equipment power consumption.

[0030] A further improvement of the present invention is that the specific working condition is the performance guarantee working condition agreed in the power station equipment purchase and sale contract or the general contract for the project, or any part load working condition.

[0031] A further improvement of the present invention is that in step B, the calculation formula of the average power consumption value W total_av is as follows:

[0032]

[0033] Where: W total_av is the statistical value of the average power consumption for unloading unit mass of raw coal in the coal unloading system, kWh / t; M start is the cumulative value shown on the coal belt at the start of the test, t; M end is the cumulative value shown on the coal belt at the end of the test, t; W jetty_start is the total incoming power value of 10kV / 6kV at the dock system at the start of the test, kWh; W jetty_end is the total incoming power value of 10kV / 6kV at the dock system at the end of the test, kWh; W conveyor_start is the total power consumption value of each coal conveyor belt not included in the 10kV / 6kV total incoming line of the dock system at the start of the test, kWh; W conveyor_end is the total power consumption value of each coal conveyor belt not included in the 10kV / 6kV total incoming line of the dock system at the end of the test, kWh; W aux_start is the total power consumption value of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV total incoming line of the dock system at the start of the test, kWh; W aux_end is the total power consumption value of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV total incoming line at the end of the test, kWh.

[0034] A further improvement of the present invention is that in step C, the designed coal consumption M design has the following calculation formula:

[0035]

[0036] Where: M design_coal is the designed coal consumption required under specific conditions of the test unit, t / h; HR g_design is the designed gross heat rate of the steam turbine under specific conditions, kJ / (kWh); P g_design is the designed gross output power of the generator under specific conditions, kW; HV design is the designed calorific value of the coal, kJ / t; η b_design is the designed boiler efficiency under specific conditions, %; η p_design is the designed pipeline efficiency under specific conditions, %; λ design is the designed auxiliary power consumption rate under specific conditions, %.

[0037] A further improvement of the present invention is that in step D, the statistical calculation value P of the power consumption of the coal unloading system under specific conditions is calculated according to formula (3) statistic_coalhandling ;

[0038] P statistic_coalhandling = W total_av × Mdesign_coal (3)

[0039] Where: P statistic_coalhandling is the statistical calculation value of the power consumption of the coal unloading system under rated conditions, in kW.

[0040] The present invention has at least the following beneficial technical effects:

[0041] In the overall performance test of a thermal power unit, by using the correction method provided by the present invention, the power consumption of the equipment of the coal unloading system using the ship-transported raw coal method can be adjusted to the designed operating conditions of the unit, so that the obtained power consumption value of the equipment of the coal unloading system can reflect the power consumption value under specific operating conditions and designed coal consumption of the unit, which is helpful to obtain more accurate overall performance indicators of the unit in the calculation of the overall performance test results of the thermal power unit; it is also helpful to further reduce the test uncertainty. The correction method proposed by the present invention takes into account both the common coefficient of the parallel coal unloading systems of a power plant with multiple units and the intermittent operation coefficient of the coal unloading system, and has strong practicability. Description of the Drawings

[0042] Figure 1 is a schematic flow diagram of the present invention.

[0043] Figure 2 is the curve of the cumulative coal unloading value of the coal unloading system versus the coal unloading time in a typical ship coal unloading process power consumption test. Detailed Embodiment

[0044] The following further details a method for correcting the power consumption of the coal unloading system in the overall performance test of a unit of the present invention in conjunction with the drawings and examples.

[0045] 1. The coal unloading system described in the present invention refers to all equipment related to the unloading and conveying of raw coal from the ship unloading terminal to the coal bunker using the ship coal transportation method. As Figure 1 shown, in order to correct and calculate the power consumption of the coal unloading system in the overall performance test of the unit, a typical ship coal unloading process power consumption test independent of the overall performance test of the unit needs to be carried out, and the average power consumption value of the coal unloading system for unloading a unit mass of raw coal is obtained by statistical methods, and the statistical power consumption value of the coal unloading system is used to correct and calculate the net power of the unit test in the overall performance test of the unit.

[0046] 2. The specific implementation steps of a typical ship coal unloading process power consumption test are as follows:

[0047] A. Record the relevant operation data of the entire coal unloading system, respectively read the data values at the start and end times of the coal unloading process test, and proceed to step B. The operation data to be recorded includes:

[0048] (a) The cumulative coal conveying volume M of the coal conveying belt i , t;

[0049] (b) Total incoming power meter reading W of the 10 kV / 6 kV main feeder of the wharf system jetty_i , kWh;

[0050] (c) Total power meter reading W of each coal conveyor belt not included in the 10 kV / 6 kV main feeder of the wharf system conveyor_i , kWh;

[0051] (d) Total power meter reading W of other auxiliary equipment of the coal unloading system not included in the 10 kV / 6 kV main feeder of the wharf system aux_i , kWh.

[0052] The power supplies of the above-mentioned several pieces of equipment are independent in terms of electrical wiring and measurement, and the recorded data do not include each other. Moreover, the recorded power consumption data include the power consumption of all equipment required for the design operation of the coal unloading system

[0053] B. According to the operation data during the power consumption test of the typical ship coal unloading process recorded in step A, determine the average power consumption value W of the coal unloading system for unloading unit mass of raw coal during the test process according to formula (1) total_av . Proceed to step C;

[0054]

[0055] In the formula: W total_av is the average power consumption statistical value of the coal unloading system for unloading unit mass of raw coal, kWh / t; M start is the cumulative value shown on the coal conveyor belt at the start of the test, t; M end is the cumulative value shown on the coal conveyor belt at the end of the test, t; W jetty_start is the power meter reading of the 10 kV / 6 kV main feeder of the wharf system at the start of the test, kWh; W jetty_end is the power meter reading of the 10 kV / 6 kV main feeder of the wharf system at the end of the test, kWh; W conveyor_start is the total power meter reading of each coal conveyor belt not included in the 10 kV / 6 kV main feeder of the wharf system at the start of the test, kWh; W conveyor_end is the total power meter reading of each coal conveyor belt not included in the 10 kV / 6 kV main feeder of the wharf system at the end of the test, kWh; W aux_start is the total power meter reading of other auxiliary equipment of the coal unloading system not included in the 10 kV / 6 kV main feeder of the wharf system at the start of the test, kWh; W aux_end is the total power meter reading of other auxiliary equipment of the coal unloading system not included in the 10 kV / 6 kV main feeder at the end of the test, kWh.

[0056] C. According to the designed boiler efficiency η b_design under specific operating conditions of the unit, and the designed gross heat rate HR g_design, the designed auxiliary power consumption rate λ of the unit under specific operating conditions design , the designed gross output power P of the generator under specific operating conditions g_design and the designed coal calorific value HV design , calculate the designed coal consumption M required for the unit under specific operating conditions according to formula (2) design , enter step D;

[0057]

[0058] Where: M design_coal is the designed coal consumption required for the test unit under specific operating conditions, t / h; HR g_design is the designed gross heat consumption rate of the steam turbine under specific operating conditions, kJ / (kWh); P g_design is the designed gross output power of the generator under specific operating conditions, kW; HV design is the designed coal calorific value, kJ / t; η b_design is the designed boiler efficiency under specific operating conditions, %; η p_design is the designed pipeline efficiency under specific operating conditions, %; λ design is the designed auxiliary power consumption rate under specific operating conditions, %.

[0059] D. According to the average power consumption statistical value W of the coal unloading system per unit mass of raw coal unloaded obtained in step B total_av and the designed coal consumption M required for the test unit under specific operating conditions obtained in step C design_coal , calculate the statistical calculation value P of the coal unloading system power consumption under specific operating conditions according to formula (3) statistic_coalhandling .

[0060] P statistic_coalhandling = W total_av × M design_coal (3)

[0061] Where: P statistic_coalhandling is the statistical calculation value of the coal unloading system power consumption under rated operating conditions, kW.

[0062] 3. As Figure 1 shown, during the overall performance test of the unit, the coal unloading process of the ship can proceed normally or can be completely stopped. The steps for correcting the power consumption calculation of the coal unloading system in the overall performance test of the unit are as follows:

[0063] E. Record the power consumption data of the coal unloading system during the overall performance test. The types of recorded data are the same as those required in step A, and synchronously record the test duration ΔT. According to the recorded data, calculate the measured power value of the coal unloading system during the overall test of the unit according to formula (4). Enter step F;

[0064]

[0065] Where: P coalhandling_test is the measured power consumption of the coal unloading system during the overall performance test of the unit, in kW; W jetty_test_start is the total incoming power meter reading of the 10kV / 6kV of the terminal system at the start of the test, in kWh; W jetty_test_end is the total incoming power meter reading of the 10kV / 6kV of the terminal system at the end of the overall performance test of the unit, in kWh; W conveyor_test_start is the total power meter reading of each coal conveyor belt not included in the 10kV / 6kV total incoming line of the terminal system at the start of the overall performance test of the unit, in kWh; W conveyor_test_end is the total power meter reading of each coal conveyor belt not included in the 10kV / 6kV total incoming line of the terminal system at the end of the overall performance test of the unit, in kWh; W aux_test_start is the total power meter reading of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV total incoming line of the terminal system at the start of the overall performance test of the unit, in kWh; W aux_test_end is the total power meter reading of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV total incoming line at the end of the overall performance test of the unit, in kWh.

[0066] F. According to the calculated statistical calculated value P of the power consumption of the coal unloading system under specific working conditions statistic_coalhandling and the measured power consumption P of the coal unloading system during the overall performance test of the unit obtained in step E coalhandling_test , calculate the correction value P of the measured net power of the unit by the coal unloading system according to formula (5) coalhandling_corr , and enter step G;

[0067] P coalhandling_corr = P total_coalhandling_test - P statistic_coalhandling (5)

[0068] Where: P coalhandling_corr is the correction value of the measured net power of the unit by the coal unloading system during the overall performance test of the unit, in kW.

[0069] G. According to the correction value P of the measured net power of the unit by the coal unloading system obtained in step F coalhandling_corr and the measured net power P during the overall performance test of the unit net_test , calculate the corrected net power P of the unit by the coal unloading system according to formula (5) net_corr , that is, complete the correction of the power consumption of the coal unloading system in the overall performance test of the unit.

[0070] P net_corr = P net_test + P coalhandling_corr (6)

[0071] Where: P net_corr is the corrected net power of the unit after the power consumption of the coal unloading system is corrected, in kW; Pnet_test is the measured net power of the unit, in kW.

[0072] As shown in Table 1 below, it is an example of the corrected calculation of the power consumption of the coal unloading system in the overall performance test of a thermal power unit.

[0073] In this example, by conducting an electricity consumption test of a typical coal unloading process during ship coal unloading, the statistically calculated value of the electricity consumption of the coal unloading system under the rated condition is obtained. This test is not carried out synchronously with the overall performance test of the unit. Figure 2 It is a schematic diagram of the curve showing the relationship between the coal unloading volume and time of the coal unloading system during ship unloading. The rated condition in this example refers to the 100% TMCR condition designed for the unit.

[0074] During this ship coal unloading period, a total of 171,980 t of coal was unloaded. By statistically calculating the electricity meter value of the 10 kV main incoming line of the terminal system, the electricity meter values at the start time of coal unloading for each coal conveying belt not included in the 10 kV main incoming line of the terminal system, and the electricity meter values of other auxiliary equipment of the coal unloading system not included in the 10 kV main incoming line of the terminal system, it is calculated that during the entire ship coal unloading period, the electricity consumption required to unload unit mass of coal is 2.128 kWh / t.

[0075] Through calculation, the coal consumption under the design conditions of the unit at 100% TMCR is 232.5 t / h, and it is deduced that the statistically calculated value of the electricity consumption of the coal unloading system during ship unloading is 494.8 kW.

[0076] In the overall performance test of the unit, the measured total electricity consumption of the coal unloading system is 149.2 kW. Therefore, the correction value of the coal unloading system for the net power of the unit is -345.6 kW. During the test period, the measured value of the net power of the unit in the overall performance test of the unit is 618,347.2 kW, and the net power of the unit after correcting the electricity consumption of the coal unloading system is 618,001.6 kW.

[0077] Table 1 Example of the corrected calculation of the power consumption of the coal unloading system in the overall performance test of a thermal power unit

[0078]

[0079]

[0080]

[0081] Although the present invention has been described in detail above with general descriptions and specific implementation examples, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A method for correcting the power consumption of the coal unloading system in the overall performance test of a unit, characterized in that, The coal unloading system refers to all the equipment related to the unloading and conveying of raw coal from the ship unloading terminal to the coal bunker by means of shipborne coal transportation. In order to correct and calculate the power consumption of the coal unloading system in the overall performance test of the unit, a power consumption test of a typical ship coal unloading process independent of the overall performance test of the unit needs to be carried out, and the average power consumption value of unloading unit mass of raw coal by the coal unloading system is obtained by statistical methods. In the overall performance test of the unit, the statistical power consumption value of the coal unloading system is used to correct and calculate the net power of the unit test; The specific implementation steps of a typical ship coal unloading process power consumption test are as follows: A. Record the relevant operation data of the entire coal unloading system, respectively read the data values at the start and end of the coal unloading process test, and enter step B. The operation data to be recorded includes: (a) Cumulative coal conveying volume M of the coal conveying belt, t i , t; (b) Total incoming power meter value W of 10kV / 6kV for the wharf system jetty_i , kWh; (c) Total power consumption value W of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the terminal system conveyor_i , kWh; (d) Total kWh value W of the total electricity consumption of other auxiliary equipment in the coal unloading system not included in the 10 kV / 6 kV main incoming line of the terminal system aux_i , kWh; B. According to the operation data during the typical ship coal unloading process power consumption test recorded in step A, determine the average power consumption value W of the coal unloading system for unloading unit mass of raw coal during the test according to formula (1), and proceed to step C; total_av , and proceed to step C; Average power consumption value W total_av The calculation formula is as follows: Where: W total_av is the statistical value of the average power consumption for unloading unit mass of raw coal in the coal unloading system, kWh / t; M start is the cumulative value shown on the coal conveyor belt at the start of the test, t; M end is the cumulative value shown on the coal conveyor belt at the end of the test, t; W jetty_start is the total incoming power meter value of the 10kV / 6kV main line of the terminal system at the start of the test, kWh; W jetty_end is the total incoming power meter value of the 10kV / 6kV main line of the terminal system at the end of the test, kWh; W conveyor_start is the total power meter value of each coal conveyor belt not included in the 10kV / 6kV main line of the terminal system at the start of the test, kWh; W conveyor_end is the total power meter value of each coal conveyor belt not included in the 10kV / 6kV main line of the terminal system at the end of the test, kWh; W aux_start is the total power meter value of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main line of the terminal system at the start of the test, kWh; W aux_end is the total power meter value of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main line at the end of the test, kWh; C. According to the designed boiler efficiency η under specific operating conditions of the unit b_design , the designed gross heat rate HR of the steam turbine under specific operating conditions g_design , the designed auxiliary power consumption rate λ of the unit under specific operating conditions design , the designed gross output power P of the generator under specific operating conditions g_design and the designed calorific value HV of the coal design , calculate the designed coal consumption M required for the unit under specific operating conditions according to formula (2) design , and enter step D; Where: M design_coal is the designed coal consumption required for the test unit under specific operating conditions, t / h; HR g_design is the designed gross heat rate of the steam turbine under specific operating conditions, kJ / (kWh); P g_design is the designed gross output power of the generator under specific operating conditions, kW; HV design is the designed calorific value of coal, kJ / t; η b_design is the designed boiler efficiency under specific operating conditions, %; η p_design is the designed pipeline efficiency under specific operating conditions, %; λ design is the designed auxiliary power consumption rate under specific operating conditions, %. D. Based on the average power consumption statistical value W of the coal unloading system for unloading unit mass of raw coal obtained in step B total_av and the designed coal consumption M required under specific operating conditions of the test unit obtained in step C design_coal , calculate the statistical calculation value P of the power consumption of the coal unloading system under specific operating conditions statistic_coalhandling ; During the overall performance test of the unit, the ship coal unloading process proceeds normally or stops running completely. The steps for correcting and calculating the power consumption of the coal unloading system in the overall performance test of the unit are as follows: E. Record the power consumption data of the coal unloading system in the overall performance test. The types of data recorded are the same as those required in step A, and simultaneously record the test duration ΔT. According to the recorded data, calculate the measured power value of the coal unloading system during the overall unit test according to formula (4), and enter step F; Where: P coalhandling_test is the measured power consumption of the coal unloading system during the overall performance test of the unit, in kW; W jetty_test_start is the total incoming power meter reading of the 10kV / 6kV of the terminal system at the start of the test, in kWh; W jetty_test_end is the total incoming power meter reading of the 10kV / 6kV of the terminal system at the end of the overall performance test of the unit, in kWh; W conveyor_test_start is the total power meter reading of each coal conveyor belt not included in the 10kV / 6kV total incoming line of the terminal system at the start of the overall performance test of the unit, in kWh; W conveyor_test_end is the total power meter reading of each coal conveyor belt not included in the 10kV / 6kV total incoming line of the terminal system at the end of the overall performance test of the unit, in kWh; W aux_test_start is the total power meter reading of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV total incoming line of the terminal system at the start of the overall performance test of the unit, in kWh; W aux_test_end is the total power meter reading of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV total incoming line at the end of the overall performance test of the unit, in kWh; F. According to the statistically calculated value P of the power consumption of the coal unloading system under specific operating conditions obtained from the calculation statistic_coalhandling and the actually measured power consumption P of the coal unloading system during the overall performance test of the unit obtained in step E coalhandling_test , the correction value P of the actually measured net power of the unit by the coal unloading system is calculated according to formula (5) coalhandling_corr , and proceed to step G; P coalhandling_corr = P total_coalhandling_test - P statistic_coalhandling (5) In the formula: P coalhandling_corr is the correction value of the coal unloading system to the measured net power of the unit during the overall performance test of the unit, kW; G. According to the correction value P of the measured net power of the unit obtained in step F for the coal unloading system coalhandling_corr and the measured net power P during the overall performance test of the unit net_test , the corrected net power P of the unit for the coal unloading system is calculated according to formula (6) net_corr , that is, the correction of the power consumption of the coal unloading system in the overall performance test of the unit is completed; P net_corr = P net_test + P coalhandling_corr (In formula (6): P net_corr is the net power of the unit after correcting the power consumption of the coal unloading system, in kW; P net_test is the measured net power of the unit, in kW.) 2. The electric power consumption correction method of the coal unloading system in the overall performance test of the unit according to claim 1, characterized in that The cumulative coal conveyor volume M of the coal conveyor belt collected in step A i , (b) the total incoming power value W of the 10kV / 6kV main incoming line of the terminal system jetty_i , (c) the total power value W of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the terminal system conveyor_i , (d) the total power value W of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main incoming line of the terminal system aux_i , are independent of each other in terms of electrical wiring and measurement, and the recorded data are not mutually inclusive. Moreover, the recorded power consumption data include the power consumption of all equipment required for the designed operation of the coal unloading system. If there is no power meter record data for the data items (b), (c), and (d) in the unit, the power consumption value of the equipment and system collected and recorded can also be determined by integrating the product of the equipment electric power measurement data and the recording time. If there is neither a power meter nor a wattmeter in the power plant data recording system for the data items (b), (c), and (d), the power consumption value of the equipment and system collected and recorded can be determined by integrating the product of the equipment current, voltage, and power factor.

3. The method for correcting the power consumption of the coal unloading system in the overall performance test of the unit according to claim 1, characterized in that, The specific operating conditions refer to the performance guarantee operating conditions stipulated in the power station equipment purchase and sale contract or the general contract for the overall project, or any part load operating conditions.

4. The method for correcting the power consumption of the coal unloading system in the overall performance test of the unit according to claim 1, wherein In step D, the statistical calculation value P of the coal unloading system power consumption under specific working conditions is calculated according to formula (3). statistic_coalhandling ; P statistic_coalhandling = W total_av × M design_coal In formula (3): P statistic_coalhandling is the statistical calculated value of the power consumption of the coal unloading system under rated conditions, in kW.

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