Method for detecting influence of reheated attemperating water provided by center tap of feeding pump on performance of unit
A technology of reheating desuperheating water and intermediate taps, which is used in engine testing, machine/structural component testing, measuring devices, etc., can solve problems such as inaccurate results and avoid correction calculations.
Active Publication Date: 2015-05-27
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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In summary, the common method is used to calculate the influence of reheating and desuperheating water in the middle tap of the feed water pump on the performance of the unit, and the result is also inaccurate
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[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0035] figure 1 The detection system diagram of the influence of reheating and desuperheating water in the middle tap of the feed water pump of the present invention on the performance of the unit is given. First, the enthalpy rise of the feed water of the heaters at all levels is measured by using the equivalent heat drop method, and the τ j Indicates; the heat release of steam in the heater, with q j Indicates; the heat release of hydrophobicity in the heater is expressed by γ j Express; and then calculate the extraction steam equivalent heat drop of each stage Extraction efficiency And the net equivalent heat drop H of new steam.
[0036] Method of the present invention is:
[0037] 1. Use the method of equivalent heat drop to measure the change of heat absorption of the system.
[0038] Since the main steam flow rate remains unchanged, the f...
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The invention relates to a method for detecting the influence of reheated attemperating water provided by a center tap of a feeding pump on the performance of a unit. The deduction process is consistent with the precondition of an equivalent enthalpy drop method and a kind of correction principle in steam turbine performance test regulations ASMEPTC6-2004 in the American national standard simultaneously. The method comprises the following steps of: keeping main steam flow unchanged by the equivalent enthalpy drop method, measuring the total heat absorption capacity change and done work change before and after the reheated attemperating water is added, and determining the relative change of economy and output of the unit before and after the reheated attemperating water is added, so that the influence of the reheated attemperating water provided by the center tap of the feeding pump on the performance of the unit is detected.
Description
technical field [0001] The invention relates to a detection method for the influence of the reheating and desuperheating water of the middle tap of the feed water pump on the performance of the unit. Background technique [0002] The desuperheating water of the reheater drawn from the middle tap of the feed water pump has a great influence on the operating economy of the unit. Generally, when the water injection flow rate of the reheater increases by 1% of the rated load of the boiler, the thermal economy of the unit decreases by about 0.2%. At present, in the quantitative analysis of the impact of reheater desuperheating water on unit economics, the method of equivalent heat drop is usually used, and most of the specific calculations are based on the reheater spraying water from the supply to Calculations are performed using methods commonly used in thermal analysis of pump tap shunt flow. The derivation process of the commonly used methods is as follows: According to "The...
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IPC IPC(8): G01M15/00
Inventor 郑威丁俊齐郝玉振
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY