A Correction Method for the Power Consumption of the Coal Feeding System in the Overall Performance Test of a Thermal Power Unit

Abstract

The present invention discloses a method for correcting the power consumption of the coal feeding system in the overall performance test of a thermal power unit, including the steps of: A. Before the test, it is determined that the belt scale of the coal feeding belt works normally, and the DCS record has data on the integrated cumulative value of coal quantity; B. The coal bunker level of the non-test unit is replenished to a high level in advance to ensure that only the test unit is fed with coal during the test; C. The designed coal flow value of the unit is determined; D. The planned test duration is determined; E. The actual test duration is determined and the actual required value of the total coal consumption is calculated; F. During the test, the coal feeding system is operated to make the difference between the cumulative value of the belt scale and the cumulative value before the test equal to the actual required value of the total coal consumption, and then the coal feeding system is stopped; G. At this time, the power consumption of the actual coal feeding system can reflect the power consumption value of the system under the designed conditions. By using the correction method provided by the present invention, the factors affecting the power consumption of the coal feeding system can be corrected to the designed conditions, which is helpful for comparing the overall performance test results of the thermal power unit with the design guarantee value.

Description

Technical Field

[0001] The present 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 the coal feeding system in the overall performance test of thermal power units. Background Art

[0002] In the overall performance test of thermal power units, the auxiliary power consumption is a very important guarantee index in the performance assessment test of thermal power units. It is an index reflecting the power consumption of the auxiliary equipment of the unit and is also an important part of the unit's power supply coal consumption. Its calculation and correction need to be as accurate as possible for the entire performance test.

[0003] Among all the auxiliary power equipment, the coal feeding system of thermal power units (transporting coal from the coal yard to the coal bunker of the unit-type boiler) usually cannot effectively directly measure the actual power consumption due to its complex system equipment, mostly small-power equipment, and complex wiring of the coal feeding system equipment. Therefore, it is of great significance to explore the method for correcting the power consumption of the coal feeding system in the calculation of the auxiliary power rate.

[0004] The main factors affecting the actual power consumption of the unit's coal feeding system include:

[0005] (1) Changes in coal quality;

[0006] (2) Deviations between the overall energy consumption of the unit and the design value;

[0007] (3) Deviations between the actual operating conditions of the unit and the design value

[0008] (4) Operating habits of operators, etc. Summary of the Invention

[0009] The purpose of the present invention is to provide a method for correcting the power consumption of the coal feeding system in the overall performance test of thermal power units. In the overall performance test of thermal power units, the measured power consumption of the coal feeding system can be corrected to the corresponding design conditions by using the method provided by the present invention.

[0010] To achieve the above purpose, the present invention adopts the following technical solutions:

[0011] A method for correcting the power consumption of the coal feeding system in the overall performance test of thermal power units, comprising the following steps:

[0012] A. Before the overall performance test of the unit, determine that the belt scale of the coal feeding belt is working properly, and proceed to step B;

[0013] B. Before the test starts, supplement the coal bunker levels of other non-test units to the high level in advance by operating the coal feeding system, and proceed to step C;

[0014] C. Determine the designed coal flow rate value F of the unit under the specified test conditions and design coal quality

[0011] ,

[0010] ,

[0014] ,

[0013] ,

[0012] , , design_coal , , , , , in t / h, enter step D;

[0015] D. Determine the planned test duration T for this test condition before the test plan , in h, enter step E;

[0016] E. During the test, the test duration adjustment value is ΔT, and the actual test duration T and the actual coal feeding amount M that needs to be carried out during the test are calculated test ; test_coal ;

[0017] F. During the test, the operator controls the operation of the coal feeding belt and feeds coal according to the actual demand value M of the total coal consumption calculated in step E test_coal . When the difference between the cumulative value of the belt scale and the cumulative value before the test reaches M test_coal , stop the operation of the coal feeding belt and enter step G;

[0018] G. Conduct the overall performance test of the unit according to steps A to F, and the actual power consumption of the coal feeding system reflects the power consumption value of the coal feeding system under the design conditions.

[0019] A further improvement of the present invention lies in that in step A, there are effective calibration and verification records, and the DCS record has the data of the coal quantity integral cumulative value.

[0020] A further improvement of the present invention lies in that in step B, it is ensured that other non-test units do not feed coal during the test, and only the test unit is fed with coal.

[0021] A further improvement of the present invention lies in that in step C, before the test, according to the power supply coal consumption under the unit design conditions and the unit output power under the specified working conditions, the designed coal flow value F of the unit under the specified test conditions and the designed coal quality is determined design_coal .

[0022] A further improvement of the present invention lies in that in step E, the actual test duration is adjusted according to the test conditions and the stability of the operating parameters.

[0023] A further improvement of the present invention lies in that in step E, the actual test duration T test is calculated according to formula (1):

[0024] T test = T plan + ΔT (1)

[0025] In the formula: T test is the actual test duration, h; T plan is the planned test duration, h; ΔT is the test duration adjustment value, h.

[0026] A further improvement of the present invention lies in that the actual coal feeding amount M required during the test test_coal is calculated according to formula (2):

[0027] M test_coal = F design_coal × T test (2)

[0028] In the formula: M test_coal is the actual demand value of the total coal consumption, t; F design_coal is the designed value of the coal flow rate of the unit under the specified test conditions, t / h.

[0029] A further improvement of the present invention lies in that in step F, this step can be carried out at any time during the test, as long as it is ensured that the difference between the cumulative value of the belt scale at the end of the test and the cumulative value before the test is equal to the actual demand value of the total coal consumption.

[0030] The present invention has at least the following beneficial technical effects:

[0031] In the overall performance test of a thermal power unit, the influencing factors of the power consumption of the coal feeding system can be corrected to the design conditions by using the correction method provided by the present invention, so that the obtained power consumption value of the coal feeding system can reflect the power consumption under the design conditions, which is helpful for comparing the overall performance test results of the thermal power unit with the design guarantee value. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic flow chart of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] The following further details the correction method for the power consumption of the coal feeding system in the calculation of the auxiliary power rate of a thermal power unit according to the present invention with reference to the drawings and examples.

[0034] As shown in the flow chart Figure 1 The correction method for the power consumption of the coal feeding system in the calculation of the auxiliary power rate of a thermal power unit provided by the present invention includes the following steps:

[0035] A. Before the overall performance test of the unit, it is determined that the belt scale of the coal feeding belt is working normally, with valid calibration and verification records, and the DCS record has coal quantity integral cumulative value data. Proceed to step B;

[0036] B. Before the test starts, by operating the coal feeding system, the coal bunker levels of other non-test units are replenished to the high level in advance to ensure that other non-test units do not feed coal during the test, and only the test unit is fed with coal. Proceed to step C;

[0037] C. Before the test, determine the coal flow design value F of the unit under the specified test conditions and design coal quality based on the power supply coal consumption under the unit design conditions and the unit output power under the specified working conditions. design_coal , unit is t / h. Go to step D;

[0038] D. Determine the planned test duration T for the test condition before the test. plan , in h. Go to step E;

[0039] E. During the test, the actual test duration is adjusted according to the test conditions and the stability of the operating parameters. The test duration adjustment value is ΔT. The actual test duration T test According to formula (1), the actual amount of coal M required during the test is test_coal Calculate according to formula (2):

[0040] T test =T plan +ΔT (1)

[0041] Where: T test Actual test duration, h; T plan The planned test duration, in hours; ΔT is the test duration adjustment value, in hours.

[0042] M test_coal =F design_coal ×T test (2)

[0043] Where: M test_coal is the actual demand value of total coal consumption, t; F design_coal It is the design value of coal flow rate of the unit under specified test conditions, t / h.

[0044] F. During the test, the operator controls the operation of the coal conveyor belt and calculates the actual demand value M of the total coal consumption calculated in step E. test_coal When the belt scale accumulates the value M belt_scale_end Compared with the cumulative value before the test M belt_scale_start The difference ΔM belt_scale The actual demand value of total coal consumption M test_coal When the values are equal, stop the coal feeding belt. This step can be performed at any time during the test. Just make sure that the difference between the accumulated value of the belt scale at the end of the test and the accumulated value before the test is equal to the actual required value of the total coal consumption. Go to step G;

[0045] G. Carry out the overall performance test of the unit according to steps A to F. The actual power consumption of the coal feeding system can reflect the power consumption value of the system under the design conditions.

[0046] The following is an example of the calculation of power consumption correction for the coal feeding system of a thermal power project:

[0047] Table 1 Example of Revised Calculation of Power Consumption of Coal Feeding System for a Thermal Power Project

[0048]

[0049] As can be seen from the example in Table 1, the difference in the cumulative value of the belt scale is equal to the actual demand value of the total coal consumption. Therefore, the power consumption of the actual coal feeding system in this test can reflect the power consumption value of the system under the design conditions.

[0050] Although the present invention has been described in detail with general descriptions and specific embodiments above, on the basis of 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 correction method for the power consumption of the coal feeding system in the overall performance test of a thermal power unit, characterized in that, Including the following steps: A. Before the overall performance test of the unit, ensure that the belt scale of the coal feeding belt is working properly, and then proceed to step B; B. Before the test starts, by operating the coal feeding system, supplement the coal bin levels of other non-test units to the high level in advance, and then proceed to step C; C. Determine the designed coal flow rate F of the unit under the specified test conditions and the designed coal quality, design_coal with the unit of t / h, and proceed to step D; D. Determine the planned test duration T for this test condition before the test plan , in hours, and proceed to step E; E. During the test, the test duration adjustment value is ΔT, and the actual test duration T is calculated test and the actual coal feeding amount M required during the test test_coal ; the actual test duration is adjusted according to the test conditions and the stability of the operating parameters; Actual test duration T test Calculate according to formula (1): T test = T plan + ΔT (1) Where: T test is the actual test duration, h; T plan is the planned test duration, h; ΔT is the test duration adjustment value, h; The actual coal feeding amount M required during the test test_coal Calculate according to formula (2): M test_coal = F design_coal × T test (2) Where: M test_coal is the actual demand value of the total coal consumption, t; F design_coal is the designed value of the coal flow rate of the unit under the specified test conditions, t / h; F. During the test, the operator controls the operation of the coal feeding belt and feeds coal according to the actual demand value M of the total coal consumption calculated in step E. test_coal When the difference between the cumulative value of the belt scale and the cumulative value before the test reaches M, test_coal stop the operation of the coal feeding belt and proceed to step G. G. Conduct the overall performance test of the unit according to steps A to F, and the power consumption of the actual coal feeding system reflects the power consumption value of the coal feeding system under the design conditions.

2. The correction method for the power consumption of the coal feeding system in the overall performance test of a thermal power unit according to claim 1, wherein In step A, there are valid calibration and verification records, and the DCS records have data on the integrated cumulative value of coal quantity.

3. A method for correcting the power consumption of the coal feeding system in the overall performance test of a thermal power unit according to claim 1, characterized in that, In step B, ensure that other non-test units do not receive coal during the test, and only the test unit receives coal.

4. A method for correcting the power consumption of the coal feeding system in the overall performance test of a thermal power unit according to claim 1, characterized in that, In step C, before the test, according to the power supply coal consumption under the design conditions of the unit and the unit output power under the specified operating conditions, determine the designed coal flow value F of the unit under the specified test conditions and the designed coal quality. design_coal .

5. A method for correcting the power consumption of the coal feeding system in the overall performance test of a thermal power unit according to claim 1, characterized in that, In step F, this step can be carried out at any time during the test, as long as it is ensured that the difference between the cumulative value of the belt scale at the end of the test and the cumulative value before the test is equal to the actual required value of the total coal consumption.

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