Fan opening degree and efficiency online calculation method based on fan performance curve

Abstract

The invention discloses a fan opening degree and efficiency online calculation method based on a fan performance curve; wherein the method comprises the steps: obtaining the actual operation parameters of a fan based on a fan online monitoring system, and the actual operation parameters comprise the fan inlet volume flow Q, the fan specific pressure energy Y, the fan efficiency eta and the fan opening degree beta; discretizing a fan design performance curve to obtain a fitting relational expression; based on the actual operation parameters of the fan and the fan design performance curve fitting relational expression, calculating the relative position of the operation point of the fan in the fan design performance curve, wherein the relative position comprises the equal opening line or equal efficiency line interval where the operation point of the fan is located and the minimum distance between the operation point and each opening line or equal efficiency line of the interval where the operation point is located; and based on a linear interpolation method, calculating an opening value and an efficiency value corresponding to the fan operation point on the performance curve of the fan operation point. The method has the characteristics of high efficiency, high precision and strong robustness, and is suitable for the on-line monitoring and diagnosis system of the three fans of the large coal-fired unit.

Description

technical field [0001] The invention belongs to the field of axial flow fans used in the flue gas system of coal-fired power plants (including axial flow fans with adjustable stator blades and axial flow fans with adjustable moving blades, etc.), and specifically relates to a fan opening 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, supply fan and induced draft fan) of domestic large-scale coal-fired units have been widely Axial fans are used. 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 certa...

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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