Field dynamic balance measuring device and method for utility boiler side fan

Abstract

The invention discloses a field dynamic balance measuring device and method for a utility boiler side fan. The method comprises the following steps of: I, reading a vibration value by using an axis vibration probe and a key phase value, wherein the vibration value comprises a power frequency amplitude and a phase angle; II, determining a weighting testing position: directly calculating a position required to be weighted by using a read-out phase angle, and calculating a weighting position angle theta according to a formula (1), wherein a position on a key phase groove where a disk rotor is reversely rotated by the angle theta serves as the position required to be weighted; and III, determining a weighting testing magnitude: inquiring needed parameters in a formula (2) from fan specifications to calculate the weighing testing magnitude. Due to the adoption of the device and the method, the successful rate of one-time weighing is greatly increased, a calculating formula is simplified, and complex steps for attaching cursors by halting are reduced on the aspect of process.

Description

technical field [0001] The invention relates to an on-site dynamic balance measuring device and a dynamic balance method for a boiler side fan of a power plant. Background technique [0002] Boiler side fans in power plants include primary fans, powder exhaust fans, induced draft fans, supply fans, desulfurization booster fans, sealing fans, purification fans, etc. They are one of the more important equipment in boiler auxiliary equipment, and the stability of fan operation is directly related to To the safe and normal operation of the entire boiler system. [0003] The mass imbalance of the fan impeller means that the center of mass of the impeller does not coincide with its center of rotation, and it is one of the most common failures of boiler-related fans in power plants. The reasons for the imbalance of the impeller quality are: 1. Congenital defects: such as uneven material, unreasonable structural design, manufacturing and installation errors, that is, there is a cer...

AI Technical Summary

Problems solved by technology

The reasons for the imbalance of the impeller quality are: 1. Congenital defects: such as uneven material, unreasonable structural design, manufacturing and installation errors, that is, there is a certain quality eccentricity in the design, processing and manufacturing of the impeller; 2. During the acquired operation Caused by: if the working conditions are poor, the blades are very susceptible to wear, large particles and tiny dust particles pass through the induced draft fan with high-temperature and high-speed flue gas, and the blades will be continuously scoured; at the same time, the surface of the impeller is very Easy to oxidize to form thick oxide skin, which will fall off automatically under centrifugal force or vibration force

[0006] 1. After the fan rotor is disassembled, return it to the manufacturer for dynamic balancing treatment. This method takes a long time to process and delays the normal power generation production work. Moreover, after the impeller balance treatment is returned, there may be large vibration caused by factors such as poor alignment when reinstalling. Case

[0007] 2. Manual calculation methods, such as two-point method, three-point method, and line-drawing method, these methods have complicated calculation steps, large amount of calculation, manual drawing, low precision, too many times of trial and weight, and great damage to equipment. It is a method that has to be adopted when the conditions of the measuring equipment are not allowed, and is currently being phased out;

The whole operation process is cumbersome and needs to be stopped for measurement, which cannot satisfy real-time online observation

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