On-line Calculation Method of Main Steam Flow in Power Plant Based on Performance Test Data

A technology of main steam flow and test data, which is applied in the field of online calculation of main steam flow in power plants, can solve the problems of large actual deviation, difficult to measure, and does not consider the influence of low-pressure cylinder exhaust steam pressure, and achieves small deviation and easy operation. , the effect of the simple correction method

Active Publication Date: 2014-10-15
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology

The disadvantage is that the measurement of boiler feed water flow and superheater desuperheating water flow on site often deviates greatly from the actual, and this method does not consider the influence of the exhaust pressure of the low-pressure cylinder on the main steam flow under the same electrical load, so it is difficult to measure accurately

Method used

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  • On-line Calculation Method of Main Steam Flow in Power Plant Based on Performance Test Data
  • On-line Calculation Method of Main Steam Flow in Power Plant Based on Performance Test Data
  • On-line Calculation Method of Main Steam Flow in Power Plant Based on Performance Test Data

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Embodiment

[0029] Example: Table 1 shows the performance test data of a 670MW unit steam turbine in a certain power plant. According to the data in the table, the test main steam flow-electric load curve can be drawn as figure 1 shown, and find the main parameters of the test conditions in it. like figure 1 As shown in the test main steam flow-electric load curve, according to the curve fitting formula, the corresponding test main steam flow can be calculated from the actual load.

[0030] Table 1

[0031]

[0032] Taking another 500MW working condition in the performance test as an example to calculate the actual main steam flow for comparison, the working condition parameters are shown in Table 2.

[0033] Table 2

[0034]

[0035] The calculation method of the present invention: first obtain the corresponding test main steam flow rate of 151752.5kg / h according to the test main steam flow-electric load curve, and then select the nearest test 80% electric load working conditio...

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Abstract

The invention relates to a main steam flow online calculation method of a power station based on performance testing data. In a performance testing, a relation curve of tested main steam flow and electrical load based on calculated main steam flow is drawed, and the tested main steam flow is calculated based on condensed water flow which is measured through ASME (American Society Mechanical Engineers) flow nozzles; in an actual operation, corresponding testing main steam flow on the curve through the electrical load is found out and main operation parameters are corrected to obtain the main steam flow in the actual operation. The calculated main steam flow through the online calculation method is small in deviation and can be consulted and performed economical analysis by power station.

Description

technical field [0001] The invention relates to an online calculation method of main steam flow in a power plant based on performance test data. Background technique [0002] The main steam flow measurement methods in the prior art are: [0003] 1. Install a standard throttling device for measurement. This measurement is limited by the accuracy of the throttling device and the transmitter, and the throttling loss is large, which is not conducive to economical operation. [0004] 2. In order to improve economy and reduce throttling loss, the main steam flow of steam turbines in large power plants is calculated according to the relationship between the regulating stage pressure and the main steam flow in design conditions, that is, according to Friugel's formula. This calculation method is affected by the design and actual operation of the flow characteristics of the flow part of the steam turbine. The main steam flow calculated during the actual operation often deviates from...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/34G01F1/50
Inventor 董洋郑威祝令凯
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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