Correction method of power consumption of coal unloading system in overall performance test of unit considering unloading speed

Abstract

This invention discloses a method for correcting the power consumption of a coal unloading system considering unloading speed during a unit overall performance test. The method includes a typical ship coal unloading process power consumption test, with the following steps: A) Recording coal unloading system data; B) Determining the stable operating time of the coal unloading speed; C) Determining the amount of statistical data; D) Calculating the average coal unloading speed, the total power of the wharf feeder line, the power of the coal conveyor belt not included in the total wharf feeder line, and the power of other auxiliary equipment; E) Calculating the power consumption required to unload a unit mass of coal; F) Determining the design coal quantity under rated operating conditions; G) Calculating the statistical value of the power consumption of the coal unloading system under rated operating conditions; H) Determining the time required to unload a ship's design coal quantity; I) Calculating the coal unloading speed correction coefficient; J) Calculating the statistical power consumption value after coal unloading speed correction. The calculation steps in the unit overall performance test are: K) Calculating the power consumption of the coal unloading system during the test; L) Calculating the net power correction value of the coal unloading system; M) Calculating the corrected net power.

Description

Technical Field

[0001] This invention belongs to the field of thermal performance testing of thermal power units, and particularly relates to a method for correcting the power consumption of the coal unloading system considering the coal unloading speed in the overall performance test of the unit. Background Technology

[0002] In the overall performance test of thermal power units, the power consumption of many auxiliary systems is difficult to measure and calculate directly due to the small intermittency coefficient of equipment operation (the actual operating time is less). Affected by the difficulty in testing the power consumption of these auxiliary systems, the calculation of the overall performance index of the unit often deviates from the actual value.

[0003] For riverside or coastal power plants that use sea transport for raw coal, the unloading volume per trip is large, resulting in a shorter average annual operating time and lower intermittency coefficient for the coal unloading system. However, the overall power consumption of the coal unloading system is relatively high. Therefore, accurate calculation of the power consumption of related equipment in this system is crucial for correcting auxiliary equipment power consumption during overall unit performance testing.

[0004] During the normal operation of the coal unloading system, in the initial stage of unloading after the ship docks, the unloading speed is usually difficult to reach the design level due to preparation work, equipment start-up and trial operation, and troubleshooting. During normal unloading, the coal transfer speed of the coal stacker / reclaimer in the coal bunker cannot be perfectly matched with the unloading speed of the dock unloading system, so there is an unavoidable deviation between the actual unloading speed and the design value. In the final stage of unloading, the transfer and leveling of coal stored in the coal yard will affect the continuous operation of the unloading system, causing the unloading speed to also be difficult to reach the design level. However, the mismatch between the unloading speed and the design value will inevitably lead to an increase in system power consumption. Summary of the Invention

[0005] The purpose of this invention is to provide a method for correcting the power consumption of a coal unloading system by considering the coal unloading speed in the overall performance test of a power unit. In the overall performance test of a thermal power unit, the method provided by this invention can correct the power consumption of the coal unloading system equipment in a power plant using sea-transported raw coal to the corresponding design conditions. The correction method of this invention considers the correction calculation method when there is a deviation between the coal unloading speed and the design value, and the obtained correction calculation results can reflect the actual power consumption of the coal unloading system.

[0006] To achieve the above objectives, the present invention employs the following technical solution: A method for correcting the power consumption of the unloading system in the overall performance test of the unit, taking into account the unloading speed, is proposed. The unloading system refers to the equipment related to the unloading and transportation of raw coal from the unloading dock to the coal bunker when using ship coal transportation. In order to correct the power consumption of the unloading system in the overall performance test of the unit, a typical ship coal unloading process power consumption test is conducted. The average power consumption value of the unloading system and the unloading speed under continuous operation conditions are obtained by statistical methods. In the overall performance test of the unit, the statistical data of the unloading system are used to correct the net power of the unit test.

[0007] A further improvement of this invention lies in the specific implementation steps of a typical ship coal unloading process power consumption test: A. Record relevant operational data for the entire coal unloading system, with data recording intervals. t inter If the interval is ≤5 minutes / time, proceed to step B; the running data to be recorded includes: (a) Cumulative coal transport volume of each coal conveyor belt M i ,t; (b) Total incoming power consumption of the 10kV / 6kV terminal system W jetty_ i , kWh; (c) Power of coal conveyor belts not included in the 10kV / 6kV main incoming line of the wharf system P conveyor_ i kW; (d) Total power of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system P aux_ i kW; B. Based on the data recorded in step A, plot (a) the cumulative coal conveying volume of each coal conveyor belt. M i The relationship curve over time is used to select a period where the coal unloading volume and time are approximately linear. This period is considered the stable operating time of the coal unloading system, and the start time of this stable operating period is marked as... T start The end time is marked as T end The stable coal conveying working time is ΔT , ΔT Calculate according to formula (1), then proceed to step C; (1) In the formula: T start Y / M / D h:m:s represents the start time of stable operation of the coal unloading system during a typical ship coal unloading process. T endThe end time of stable operation of the coal unloading system during a typical ship coal unloading process, Y / M / D h:m:s; ΔT The stable coal conveying operation time of the coal unloading system during a typical ship coal unloading process is given in hours. A For time unit conversion factor; C. Based on the data recording interval determined in step A t inter and the stable coal conveying operation time of the coal unloading system during the ship coal unloading process determined in step B. ΔT The number of valid data points for the average value of the recorded data is calculated according to formula (2). j Proceed to step D; (2) D. The start time of the stable operation of the coal unloading system as determined in step B. T start End time T end Extract the recorded data from step A; calculate the average coal conveying speed of each coal conveyor belt according to formula (3). m av ; Calculate the average power of the total 10kV / 6kV incoming lines at the wharf according to formula (4). P jetty_av ; Calculate the average electrical power of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system according to formula (5). P conveyor_ av ; Calculate the average total power of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system according to formula (6). P aux_ av Proceed to step E; (3) In the formula: m av The average coal conveying speed of each conveyor belt is expressed in tons per hour (t / h). M j The end time of stable operation of the coal conveyor belt power unloading system for each route. T end The cumulative coal transport volume of each coal conveyor belt, in tons; M 1 represents the start time of stable operation of the coal unloading system. T start The cumulative coal transport volume of each coal conveyor belt, in tons; (4) In the formula: P jetty_ av The average total electrical power of the 10kV / 6kV incoming lines at the wharf, in kW; W jetty_ jThe end time of stable operation of the coal conveyor belt power unloading system for each route. T end The total incoming power consumption of the 10kV / 6kV terminal system, in kWh; W jetty_ 1 The start time for the stable operation of the coal conveyor belt power unloading system. T start The total incoming power consumption of the 10kV / 6kV terminal system, in kWh; (5) In the formula: P conveyor_ av The average electrical power (kW) of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system. P conveyor_ i The power output (kW) of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system; (6) In the formula: P aux_ av The total power, in kW, is the average power of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. P aux_ i The total power (kW) of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. E. The average coal conveying speed of each coal conveyor belt calculated based on step D. m av Average power of the 10kV / 6kV total incoming lines at the wharf P jetty_av Average electrical power of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system P conveyor_ av The average total power of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. P aux_ av The average total power consumption required for unloading and transporting a unit mass of coal in the coal unloading system is calculated according to formula (7). P coalhandling_av Proceed to step F; (7) In the formula: P coalhandling_ av The average total power consumption required for the coal unloading system to unload and transport a unit mass of coal, in kWh / t; F. Based on the design net heat rate under rated operating conditions of the unit. HR net_design Net output power of the unit under rated operating conditions P net_designand the design calorific value of coal HV design According to formula (8), the required design coal consumption of the computer group under rated operating conditions M design Proceed to step H; (8) In the formula: M design_coal The design coal consumption required for the unit under rated operating conditions is given in t / h; the design net heat rate under rated operating conditions is given. HR net_design kJ / (kWh); Design net output power of the unit under rated operating conditions P net_design kW; Design coal calorific value HV design , kJ / t; G. The average total power consumption required for the coal unloading system to unload and transport a unit mass of coal, obtained from step F. P coalhandling_av and the design coal consumption required under rated operating conditions of the unit obtained in step F. M design_coal The statistical calculation value of the coal unloading system under rated operating conditions is obtained according to formula (9). P statistic_coalhandling Proceed to step H; (9) In the formula: P statistic_coalhandling The power consumption of the coal unloading system under rated operating conditions is the statistically calculated value in kW; H. The average coal conveying speed of each coal conveyor belt determined in step D. m av Designed single-ship coal unloading capacity Q coal_design The time required to unload the designed coal load of a ship is calculated according to formula (10). ΔT coal_design Proceed to step I; (10) In the formula: ΔT coal_design The time required to unload the designed amount of coal from a ship, in hours (h). Q coal_design To design the coal unloading capacity per ship in a single trip, t; I. The time required to unload the designed coal volume of a ship, as determined in step H. ΔT coal_design Design unloading capacity of coal per ship Q coal_design Duration ΔTg The coal unloading speed correction coefficient is calculated according to formula (11). x Proceed to step J; (11) In the formula: x This is a correction factor for coal unloading speed; ΔT g To design the amount of coal to be unloaded from a ship in a single operation Q coal_design Duration, h; J. Calculate the power consumption of the coal unloading system under rated operating conditions based on the values ​​determined in step G. P statistic_coalhandling The coal unloading speed correction coefficient determined in step I x The power consumption statistics of the coal unloading system after the coal unloading speed correction are calculated according to formula (12). P statistic_coalhandling_corr ; (12).

[0008] A further improvement of this invention is that during the overall performance test of the unit, the coal unloading process of the ship can proceed normally or be completely stopped.

[0009] A further improvement of this invention is that the calculation steps for correcting the power consumption of the coal unloading system in the overall performance test of the unit are as follows: K. Record the power consumption data of the coal unloading system during the overall performance test. The types of data recorded should be the same as those required in step A. Based on the recorded data and the start time of the overall performance test... T start_test and end time T end_test Formulas (1) to (6) are used to calculate the average electrical power of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system during the overall performance test. P conveyor_ av_test Average power of the 10kV / 6kV total incoming lines at the wharf P jetty_av_test The average total power of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. P aux_ av_test Proceed to step L; L. Statistical calculation value of coal unloading system power consumption under rated operating conditions obtained from step J. P statistic_coalhandling_corr and the measured power consumption of the coal unloading system during the overall performance test of the unit obtained in step K. P total_coalhandling_test Proceed to step M; M. Correction value for the measured net power of the unit based on the coal unloading system obtained in step L. Pcoalhandling_ corr Net power measured during the overall performance test of the unit P net_test This means correcting the power consumption of the coal unloading system during the overall performance test of the unit.

[0010] A further improvement of the present invention is that the measured power consumption of the coal unloading system during the overall performance test of the unit is calculated according to formula (13). P total_coalhandling_test : (13) In the formula: P total_coalhandling_test The measured power consumption of the coal unloading system during the overall performance test of the unit is in kW; P conveyor_ av The average electrical power (kW) of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system during the overall performance test of the unit. P jetty_ av The average total electrical power of the 10kV / 6kV incoming lines at the dock during the overall performance test of the unit, in kW; P aux_ av The value in kW represents the average total power of other auxiliary equipment in the coal unloading system, excluding those in the 10kV / 6kV main incoming line of the terminal system, during the overall performance test of the unit.

[0011] A further improvement of the present invention is that the correction value of the coal unloading system to the measured net power of the unit is calculated according to formula (14). P coalhandling_ corr : (14) In the formula: P coalhandling_corr This is the correction value (kW) for the measured net power of the unit by the coal unloading system during the overall performance test of the unit.

[0012] A further improvement of the present invention is that the net power of the unit after correction of the coal unloading system is calculated according to formula (15). P net_corr : (15).

[0013] A further improvement of the present invention is that the total incoming power consumption of the 10kV / 6kV terminal system collected in step A (2) is... W jetty_i (3) Power of coal conveyor belts not included in the 10kV / 6kV main incoming line of the wharf system P conveyor_ i and (4) the total power of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. Paux_ i The electrical wiring and measurement methods are independent of each other, the recorded data are not mutually inclusive, and the recorded power consumption data includes the power consumption of all equipment required for the design and operation of the coal unloading system.

[0014] A further improvement of the present invention is that the rated operating condition is the performance guarantee operating condition stipulated in the power plant equipment purchase or sale contract or EPC contract, or any part of the load operating condition.

[0015] The present invention has at least the following beneficial technical effects: In the overall performance test of thermal power units, the correction method provided in this paper can be used to bring the power consumption of the coal unloading system equipment using the coal transport method to the design conditions. The correction calculation method takes into account the influence of the coal unloading speed of the coal unloading system, so that the obtained power consumption of the coal unloading system can reflect the power consumption value under the design conditions, thereby helping to compare the overall performance test results of thermal power units with the design guarantee value.

[0016] The correction method proposed in this invention not only considers the common coefficient of the coal unloading system when multiple units are running in parallel, as well as the intermittent operation coefficient of the coal unloading system, but also considers the correction calculation of the coal unloading speed of the coal unloading system, which has strong practicality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the process of the present invention.

[0018] Figure 2 This is a schematic diagram of the cumulative coal volume of the coal conveyor belt in an embodiment of the present invention. Detailed Implementation

[0019] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] 1. For example Figure 1As shown in the present invention, a method for correcting the power consumption of the unloading system in a unit's overall performance test, considering the unloading speed, is described. The unloading system refers to the equipment used for unloading and transporting raw coal from the unloading dock to the coal bunker when using ship-based coal transportation. To correct the power consumption of the unloading system in the unit's overall performance test, a typical ship-based coal unloading process power consumption test needs to be conducted. Statistical methods are used to obtain the average power consumption value of the unloading system and the unloading speed under continuous operating conditions. In the unit's overall performance test, the statistical data from the unloading system is used to correct the net power consumption of the unit during the test.

[0021] The specific implementation steps of a typical ship coal unloading process power consumption test are as follows: A. Record relevant operational data for the entire coal unloading system, with data recording intervals. t inter If the interval is ≤5 minutes / time, proceed to step B. The following runtime data needs to be recorded: (a) Cumulative coal transport volume of each coal conveyor belt M i ,t; (b) Total incoming power consumption of the 10kV / 6kV terminal system W jetty_ i , kWh; (c) Power of coal conveyor belts not included in the 10kV / 6kV main incoming line of the wharf system P conveyor_ i kW; (d) Total power of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system P aux_ i , kW.

[0022] B. Based on the data recorded in step A, plot (a) the cumulative coal conveying volume of each coal conveyor belt. M i The relationship curve over time is used to select a period where the coal unloading volume and time are approximately linear. This period is considered the stable operating time of the coal unloading system, and the start time of this stable operating period is marked as... T start The end time is marked as T end The stable coal conveying working time is ΔT , ΔT Calculate according to formula (1), then proceed to step C; (1) In the formula: T start Y / M / D h:m:s represents the start time of stable operation of the coal unloading system during a typical ship coal unloading process. Tend The end time of stable operation of the coal unloading system during a typical ship coal unloading process, Y / M / D h:m:s; ΔT The stable coal conveying operation time of the coal unloading system during a typical ship coal unloading process is given in hours. A This is the time unit conversion factor.

[0023] C. Based on the data recording interval determined in step A t inter and the stable coal conveying operation time of the coal unloading system during the ship coal unloading process determined in step B. ΔT The number of valid data points for the average value of the recorded data is calculated according to formula (2). j Proceed to step D; (2) D. The start time of the stable operation of the coal unloading system as determined in step B. T start End time T end Extract the recorded data from step A; calculate the average coal conveying speed of each coal conveyor belt according to formula (3). m av ; Calculate the average power of the total 10kV / 6kV incoming lines at the wharf according to formula (4). P jetty_av ; Calculate the average electrical power of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system according to formula (5). P conveyor_ av ; Calculate the average total power of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system according to formula (6). P aux_ av Proceed to step E; (3) In the formula: m av The average coal conveying speed of each conveyor belt is expressed in tons per hour (t / h). M j The end time of stable operation of the coal conveyor belt power unloading system for each route. T end The cumulative coal transport volume of each coal conveyor belt, in tons; M 1 represents the start time of stable operation of the coal unloading system. T start The cumulative coal transport volume of each coal conveyor belt, in tons.

[0024] (4) In the formula: P jetty_ avThe average total electrical power of the 10kV / 6kV incoming lines at the wharf, in kW; W jetty_ j The end time of stable operation of the coal conveyor belt power unloading system for each route. T end The total incoming power consumption of the 10kV / 6kV terminal system, in kWh; W jetty_ 1 The start time for the stable operation of the coal conveyor belt power unloading system. T start The total incoming power consumption of the 10kV / 6kV terminal system is kWh.

[0025] (5) In the formula: P conveyor_ av The average electrical power (kW) of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system. P conveyor_ i The power of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system is expressed in kW.

[0026] (6) In the formula: P aux_ av The total power, in kW, is the average power of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. P aux_ i The total power (kW) of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system.

[0027] E. The average coal conveying speed of each coal conveyor belt calculated based on step D. m av Average power of the 10kV / 6kV total incoming lines at the wharf P jetty_av Average electrical power of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system P conveyor_ av The average total power of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. P aux_ av Calculate the average total power consumption required for unloading and transporting a unit mass of coal in the coal unloading system according to formula (7). P coalhandling_av Proceed to step F; (7) In the formula: P coalhandling_ av This represents the average total electricity consumption per unit mass of coal required for the coal unloading system, expressed in kWh / t.

[0028] F. Based on the design net heat rate under rated operating conditions of the unit. HR net_design Net output power of the unit under rated operating conditions P net_design and the design calorific value of coal HV design According to formula (8), the required design coal consumption of the computer group under rated operating conditions M design Proceed to step H; (8) In the formula: M design_coal The design coal consumption required for the unit under rated operating conditions is given in t / h; the design net heat rate under rated operating conditions is given. HR net_design kJ / (kWh); Design net output power of the unit under rated operating conditions P net_design kW; Design coal calorific value HV design , kJ / t.

[0029] G. The average total power consumption required for the coal unloading system to unload and transport a unit mass of coal, obtained from step F. P coalhandling_av and the design coal consumption required under rated operating conditions of the unit obtained in step F. M design_coal The statistical calculation value of the coal unloading system under rated operating conditions is obtained according to formula (9). P statistic_coalhandling Proceed to step H; (9) In the formula: P statistic_coalhandling The power consumption of the coal unloading system under rated operating conditions is the statistically calculated value in kW.

[0030] H. The average coal conveying speed of each coal conveyor belt determined in step D. m av Designed single-ship coal unloading capacity Q coal_design The time required to unload the designed coal load of a ship is calculated according to formula (10). ΔT coal_design Proceed to step I; (10) In the formula: ΔT coal_design The time required to unload the designed amount of coal from a ship, in hours (h). Q coal_designThe design capacity for a single ship coal unloading operation is t.

[0031] I. The time required to unload the designed coal volume of a ship, as determined in step H. ΔT coal_design Design unloading capacity of coal per ship Q coal_design Duration ΔT g The coal unloading speed correction coefficient is calculated according to formula (11). x Proceed to step J; (11) In the formula: x This is a correction factor for coal unloading speed; ΔT g To design the amount of coal to be unloaded from a ship in a single operation Q coal_design Duration, in hours (h).

[0032] J. Calculate the power consumption of the coal unloading system under rated operating conditions based on the values ​​determined in step G. P statistic_coalhandling The coal unloading speed correction coefficient determined in step I x The power consumption statistics of the coal unloading system after the coal unloading speed correction are calculated according to formula (12). P statistic_coalhandling_corr Proceed to step J; (12) During the overall performance test of the unit, the coal unloading process can proceed normally or be completely shut down. The calculation steps for the power consumption correction of the coal unloading system during the overall performance test of the unit are as follows: K. Record the power consumption data of the coal unloading system during the overall performance test. The types of data recorded are the same as required in step A, based on the recorded data and the start time of the overall performance test. T start_test and end time T end_test Formulas (1) to (6) are used to calculate the average electrical power of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system during the overall performance test. P conveyor_ av_test Average power of the 10kV / 6kV total incoming lines at the wharf P jetty_av_test The average total power of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. P aux_ av_test The measured power consumption of the coal unloading system during the overall performance test of the unit was calculated according to formula (13). P total_coalhandling_test Proceed to step L; (13) In the formula: P total_coalhandling_test The measured power consumption of the coal unloading system during the overall performance test of the unit is in kW; P conveyor_ av The average electrical power (kW) of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system during the overall performance test of the unit. P jetty_ av The average total electrical power of the 10kV / 6kV incoming lines at the dock during the overall performance test of the unit, in kW; P aux_ av The value in kW represents the average total power of other auxiliary equipment in the coal unloading system, excluding those in the 10kV / 6kV main incoming line of the terminal system, during the overall performance test of the unit.

[0033] L, Statistical calculation values ​​of coal unloading system power consumption under rated operating conditions obtained from step J. P statistic_coalhandling_corr and the measured power consumption of the coal unloading system during the overall performance test of the unit obtained in step K. P total_coalhandling_test The correction value of the coal unloading system to the measured net power of the unit is calculated according to formula (14). P coalhandling_ corr Proceed to step M; (14) In the formula: P coalhandling_corr This is the correction value (kW) for the measured net power of the unit by the coal unloading system during the overall performance test of the unit.

[0034] M. Correction value for the measured net power of the unit based on the coal unloading system obtained in step L. P coalhandling_ corr Net power measured during the overall performance test of the unit P net_test The net power of the unit after the coal unloading system is corrected is calculated according to formula (15). P net_corr This means correcting the power consumption of the coal unloading system during the overall performance test of the unit.

[0035] (15) The total incoming power consumption of the 10kV / 6kV terminal system collected in step A (2) W jetty_i (3) Power of coal conveyor belts not included in the 10kV / 6kV main incoming line of the wharf system P conveyor_ i and (4) the total power of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. P aux_ iThe electrical wiring and measurement methods are independent of each other, the recorded data are not mutually inclusive, and the recorded power consumption data includes the power consumption of all equipment required for the design and operation of the coal unloading system.

[0036] The rated operating condition can be the performance guarantee operating condition stipulated in the power plant equipment purchase and sale contract or the EPC contract, or it can be any part of the load operating condition.

[0037] Table 1 below shows an example of power consumption correction calculation for the coal unloading system in the overall performance test of a thermal power unit.

[0038] In this example, the power consumption of the coal unloading system under rated operating conditions is obtained by conducting a typical ship coal unloading process power consumption test during unloading. This test is not conducted simultaneously with the overall performance test of the unit.

[0039] from Figure 2 It can be seen that after the self-unloading coal system starts working, for a period of time, the unloading speed is unstable and slow due to equipment startup, troubleshooting, and coal storage transfer in the coal bunker; after the system equipment is properly adjusted, the unloading system enters a stable working period. Figure 2 As shown in Table 1, the stable coal conveying operation time is 95.57 hours. In the later stages of the coal unloading system, due to the large accumulation of raw coal in the coal bunker, the time required for transfer and documentation by the stacker / reclaimer is long, resulting in intermittent operation of the coal unloading system and affecting the unloading speed. The rated operating condition in this example refers to the 100% TMCR operating condition designed for the unit.

[0040] During the stable operating period of the coal unloading system during unloading, the average coal conveying speed of conveyor belt A is 776.8 t / h, the average coal conveying speed of conveyor belt B is 435.4 t / h, the average total power of the 10kV incoming line A at the wharf is 332.1 kW, the average total power of the 10kV incoming line B at the wharf is 376.1 kW, and the total power of all coal conveyor belts not included in the 10kV main incoming line of the wharf system is 843.9 kW. The total statistical power consumption of the coal unloading system during the stable operating period is 2014.2 kW, and the design coal consumption required under the rated operating conditions of the unit is 216.1 t / h. Based on the above data, the statistical calculation value of the power consumption of the coal unloading system under the rated operating conditions is 359.1 kW.

[0041] Under the design conditions, the ship's single coal unloading capacity is 180,000 tons. Based on the actual stable unloading speed, the unloading time required to unload 180,000 tons of coal is 148.5 hours. The coal unloading speed of the unloading system specified in the EPC contract is 115.92 hours. Therefore, the correction factor for power consumption based on the unloading speed is 1.28. The statistical value of power consumption of the unloading system after the unloading speed correction is 460 kW.

[0042] In the overall performance test of the unit, the measured total power consumption of the coal unloading system was 123.8kW, and the measured net power of the unit was 618347.2kW. Therefore, the correction value of the coal unloading system to the net power of the unit is -336.2kW, and the net power of the unit after the correction is 618011.0kW.

[0043] Table 1. Example of power consumption correction calculation for coal unloading system in overall performance test of a thermal power unit.

[0044] 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 a coal unloading system considering the coal unloading speed in the overall performance test of the unit, characterized in that, The coal unloading system on which this method is based refers to the equipment related to the unloading and transportation of raw coal from the unloading dock to the coal bunker using ship coal transportation. In order to correct the calculation of 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 was conducted. The average power consumption value of the coal unloading system and the coal unloading speed under continuous operation conditions were obtained by statistical methods. In the overall performance test of the unit, the statistical data of the coal unloading system were used to correct the calculation of the net power of the unit test. The specific implementation steps for conducting a typical ship coal unloading process power consumption test are as follows: A. Record relevant operational data for the entire coal unloading system, with data recording intervals. t inter If the interval is ≤5 minutes / time, proceed to step B; the running data to be recorded includes: (a) Cumulative coal transport volume of each coal conveyor belt M i ,t; (b) Total incoming power consumption of the 10kV / 6kV terminal system W jetty_ i , kWh; (c) Power of coal conveyor belts not included in the 10kV / 6kV main incoming line of the wharf system P conveyor_ i kW; (d) Total power of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system P aux_ i kW; B. Based on the data recorded in step A, plot (a) the cumulative coal conveying volume of each coal conveyor belt. M i The relationship curve between coal unloading volume and time is used to select a period in time where the relationship is approximately linear. This period is considered the stable operating time of the coal unloading system, and the start time of stable operation of the coal unloading system during this period is marked as... T start The end time is marked as T end The stable coal conveying working time is ΔT , ΔT Calculate according to formula (1), then proceed to step C; （1） In the formula: T start Y / M / D h:m:s represents the start time of stable operation of the coal unloading system during a typical ship coal unloading process. T end The end time of stable operation of the coal unloading system during a typical ship coal unloading process, Y / M / D h:m:s; ΔT The stable coal conveying operation time of the coal unloading system during a typical ship coal unloading process is given in hours. A For time unit conversion factor; C. Based on the data recording interval determined in step A t inter and the stable coal conveying operation time of the coal unloading system during the ship coal unloading process determined in step B. ΔT The number of valid data points for the average value of the recorded data is calculated according to formula (2). j Proceed to step D; （2） D. The start time of the stable operation of the coal unloading system as determined in step B. T start End time T end Extract the recorded data from step A; calculate the average coal conveying speed of each coal conveyor belt according to formula (3). m av ; Calculate the average power of the total 10kV / 6kV incoming lines at the wharf according to formula (4). P jetty_av ; Calculate the average electrical power of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system according to formula (5). P conveyor_ av ; Calculate the average total power of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system according to formula (6). P aux_ av Proceed to step E; （3） In the formula: m av The average coal conveying speed of each conveyor belt is expressed in tons per hour (t / h). M j The end time of stable operation of the coal unloading system of each coal conveyor belt. T end The cumulative coal transport volume of each coal conveyor belt, in tons; M 1 represents the start time of stable operation of the coal unloading system. T start The cumulative coal transport volume of each coal conveyor belt, in tons; （4） In the formula: P jetty_ av The average electrical power of the total 10kV / 6kV incoming lines at the wharf, in kW; W jetty_ j The end time of stable operation of the coal unloading system of each coal conveyor belt. T end The total incoming power consumption of the 10kV / 6kV terminal system, in kWh; W jetty_ 1 The start time for the stable operation of the coal conveyor belt power unloading system. T start The total incoming power consumption of the 10kV / 6kV terminal system, in kWh; （5） In the formula: P conveyor_ av The average electrical power (kW) of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system. （6） E. The average coal conveying speed of each coal conveyor belt calculated based on step D. m av Average power of the 10kV / 6kV total incoming lines at the wharf P jetty_av Average electrical power of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system P conveyor_ av The average total power of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. P aux_ av The average total power consumption required for unloading and transporting a unit mass of coal in the coal unloading system is calculated according to formula (7). P coalhandling_av Proceed to step F; （7） In the formula: P coalhandling_ av The average total power consumption required for the coal unloading system to unload and transport a unit mass of coal, in kWh / t; F. Based on the design net heat rate under rated operating conditions of the unit. HR net_design Net output power of the unit under rated operating conditions P net_design and the design calorific value of coal HV design According to formula (8), the required design coal consumption of the computer group under rated operating conditions M design_coal Proceed to step G; （8） In the formula: M design_coal The design coal consumption required for the unit under rated operating conditions is given in t / h; the design net heat rate under rated operating conditions is given. HR net_design kJ / (kWh); Design net output power of the unit under rated operating conditions P net_design kW; Design coal calorific value HV design , kJ / t; G. The average total power consumption required for the coal unloading system to unload and transport a unit mass of coal, obtained from step E. P coalhandling_av and the design coal consumption required under rated operating conditions of the unit obtained in step F. M design_coal The statistical calculation value of the coal unloading system under rated operating conditions is obtained according to formula (9). P statistic_coalhandling Proceed to step H; （9） In the formula: P statistic_coalhandling The power consumption of the coal unloading system under rated operating conditions is the statistically calculated value in kW; H. The average coal conveying speed of each coal conveyor belt determined in step D. m av Designed single-ship coal unloading capacity Q coal_design The time required to unload the designed coal load of a ship is calculated according to formula (10). ΔT coal_design Proceed to step I; （10） In the formula: ΔT coal_design The time required to unload the designed amount of coal from a ship, in hours (h). Q coal_design To design the coal unloading capacity per ship in a single trip, t; I. The time required to unload the designed coal volume of a ship, as determined in step H. ΔT coal_design Design unloading capacity of coal per ship Q coal_design Duration ΔT g The coal unloading speed correction coefficient is calculated according to formula (11). ξ Proceed to step J; （11） In the formula: ξ This is a correction factor for coal unloading speed; ΔT g To design the amount of coal to be unloaded from a ship in a single operation Q coal_design Duration, h; J. Calculate the power consumption of the coal unloading system under rated operating conditions based on the values ​​determined in step G. P statistic_coalhandling The coal unloading speed correction coefficient determined in step I ξ The power consumption statistics of the coal unloading system after the coal unloading speed correction are calculated according to formula (12). P statistic_coalhandling_corr ; （12） The steps for calculating the power consumption correction of the coal unloading system in the overall performance test of the unit are as follows: K. Record the power consumption data of the coal unloading system during the overall performance test. The types of data recorded should be the same as those required in step A. Based on the recorded data and the start time of the overall performance test... T start_test and end time T end_test Formulas (1) to (6) are used to calculate the average electrical power of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system during the overall performance test. P conveyor_ av_test Average power of the 10kV / 6kV total incoming lines at the wharf P jetty_av_test The average total power of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. P aux_ av_test Proceed to step L; L. Statistical calculation value of coal unloading system power consumption under rated operating conditions obtained from step J. P statistic_coalhandling_corr Measured power consumption of the coal unloading system during the overall performance test of the unit P total_coalhandling_test Proceed to step M; The measured power consumption of the coal unloading system during the overall performance test of the unit was calculated according to formula (13). P total_coalhandling_test : （13） In the formula: P total_coalhandling_test The measured power consumption of the coal unloading system during the overall performance test of the unit is in kW; The average electrical power (kW) of each coal conveyor belt not included in the 10kV / 6kV main incoming line of the wharf system during the overall performance test of the unit. The average electrical power (kW) of the total 10kV / 6kV incoming lines at the dock during the overall performance test of the generating unit. The average total power (kW) of other auxiliary equipment in the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system during the overall performance test of the unit. M. Correction value for the measured net power of the unit based on the coal unloading system. P coalhandling_ corr Net power measured during the overall performance test of the unit P net_test This means completing the correction of the coal unloading system's power consumption in the overall performance test of the unit; The correction value of the coal unloading system to the measured net power of the unit is calculated according to formula (14). P coalhandling_ corr : （14） In the formula: P coalhandling_corr This is the correction value (kW) for the measured net power of the unit by the coal unloading system during the overall performance test of the unit. The net power of the unit after the coal unloading system is corrected is calculated according to formula (15). P net_corr : （15） 。 2. The method for correcting the power consumption of the coal unloading system considering the coal unloading speed in the overall performance test of the unit according to claim 1, characterized in that, During the overall performance test of the unit, the coal unloading process of the ship can proceed normally or be completely stopped.

3. The method for correcting the power consumption of the coal unloading system considering the coal unloading speed in the overall performance test of the unit according to claim 1, characterized in that, The total incoming power consumption of the 10kV / 6kV terminal system collected in step A (2) W jetty_i (3) Power of coal conveyor belts not included in the 10kV / 6kV main incoming line of the wharf system P conveyor_ i and (4) the total power of other auxiliary equipment of the coal unloading system not included in the 10kV / 6kV main incoming line of the wharf system. P aux_ i The electrical wiring and measurement methods are independent of each other, the recorded data are not mutually inclusive, and the recorded power consumption data includes the power consumption of all equipment required for the design and operation of the coal unloading system.

4. The method for correcting the power consumption of the coal unloading system considering the coal unloading speed in the overall performance test of the unit according to claim 1, characterized in that, The rated operating condition mentioned is the performance guarantee operating condition stipulated in the power plant equipment purchase and sale contract or EPC contract, or any part of the load operating condition.

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