Power plant primary fan vibration state evaluation method based on membership fuzzy function

Abstract

The invention discloses a coal-fired power plant primary fan vibration state evaluation method based on a membership fuzzy function. The method comprises the steps of obtaining an absolute value of acurrent axial vibration value and a membership function coefficient; calculating to obtain a vibration absolute value characteristic value according to the membership function coefficient and the absolute value of the current shaft vibration value; judging whether the current rotating speed of the primary fan is stable or not; if so, calculating a vibration climbing amount, a vibration fluctuationamount and a vibration abrupt change amount, otherwise, setting the bearing vibration climbing characteristic value, the bearing vibration fluctuation characteristic value and the bearing vibration abrupt change characteristic value to be zero; respectively calculating a bearing vibration climbing characteristic value, a bearing vibration fluctuation characteristic value and a bearing vibration sudden change characteristic value according to the corresponding membership function coefficients; and evaluating the vibration state of the primary fan according to the maximum value of the vibrationabsolute value characteristic value, the bearing vibration climbing characteristic value, the bearing vibration fluctuation characteristic value and the bearing vibration abrupt change characteristicvalue. Mass data are analyzed, and finally the precise vibration state of the primary air fan is obtained.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to an evaluation method for the vibration state of a primary fan in a coal-fired power plant based on a membership fuzzy function. Background technique [0002] The primary fan of a coal-fired power plant is mainly to pressurize the air, and rely on the wind pressure to blow the pulverized coal into the furnace for combustion. As one of the three major fans in the power plant, the stable and efficient operation of the primary fan affects the load and efficiency of the unit. Once the primary fan fails and stops, the unit will directly face the consequences of shutting down or greatly reducing the load. The vibration value of the primary fan bearing is an important monitoring index during the operation of the primary fan. The excessive vibration of the bearing is a serious hidden danger that threatens the safe, stable and reliable operation of the fan. Therefore, how to quick...

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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a method for evaluating the vibration state of the primary fan in a coal-fired power plant based on the membership fuzzy function, so as to solve the problem that the evaluation of the vibration state of the primary fan in the prior art is not accurate enough

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