An online calculation method of fan opening and efficiency based on fan performance curve

Abstract

The invention discloses an online fan opening and efficiency calculation method based on the fan performance curve. The method obtains the actual operating parameters of the fan based on the fan online monitoring system, including fan inlet volume flow Q, fan specific pressure energy Y, and fan efficiency η and the fan opening β; the fan design performance curve is discretized to obtain the fitting relational expression; based on the fan actual operating parameters and the fan design performance curve fitting relational expression, calculate the relative position of the fan operating point on the fan design performance curve, including the fan The equal opening line or equal efficiency line interval where the operating point is located, the minimum distance from the operating point to each opening line or equal efficiency line in the interval; based on the linear interpolation method, the corresponding fan operating point on its performance curve is calculated. The opening value and efficiency value. The invention has the characteristics of high efficiency, high precision and strong robustness, and is suitable for the online monitoring and diagnosis system of the three wind turbines of the large coal-fired unit.

Description

technical field [0001] The invention belongs to the field of axial flow fans (including static blade adjustable axial flow fans and moving blade adjustable axial flow fans, etc.) used in the flue gas system of coal-fired power plants, and in particular relates to a fan opening degree based on fan performance curves and efficiency online calculation method. Background technique [0002] With the development of fan design and manufacturing technology in China, the three major fans (primary fan, blower and induced draft fan) of large-scale coal-fired units in China have been widely Axial flow fan is used. However, under the background of frequent peak shaving of domestic thermal power units, the fan equipment of the power station also needs to be adjusted frequently. Due to the complex structure of the axial fan and the large amount of impurities in the medium, the axial fan is adjusted and operated under frequent changing conditions. After a certain period of time, problems ...

AI Technical Summary

Problems solved by technology

However, under the background of frequent peak shaving of domestic thermal power units, fan equipment in power stations also needs to be adjusted frequently; due to factors such as the complex structure of axial flow fans and the large amount of impurities in the medium, axial flow fans are frequently adjusted and operated under variable working conditions After a certain period of time, problems such as blade wear, jamming and damage to blade angle adjustment parts gradually appear, making the actual performance of the fan gradually deviate from its design performance, reducing the safety and economy of fan operation

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