Method for identifying noise source in waste heat boiler

Abstract

The invention discloses a method for identifying a noise source in a waste heat boiler. The method comprises the steps that S1, a two-dimensional bare pipe model is established, the flow field and the sound field of bare pipes of two pipe arrays of a high-pressure superheater and a deoxidizing evaporator are respectively calculated in a simulated mode, the sectional characteristic frequency is calculated, and the characteristic frequency range inside the whole boiler is estimated; S2, a finned pipe finite element model is established, the flow field and the sound field of each single finned pipe in the two pipe arrays of the high-pressure superheater and the deoxidizing evaporator are respectively calculated in a simulated mode, the sectional characteristic frequency is calculated, and the characteristic frequency range inside the whole boiler is estimated; S3, the characteristic frequency of the pipe arrays is corrected; S4, the normal frequency is calculated and whether the normal frequency is excited to generate sound cavity resonance or not is judged; S5, sound transmission loss and sound insulation calculation are conducted on the boiler and total noise in the boiler is obtained with the combination of actually-measured noise data; S6, the contribution to the noise in the boiler by different kinds of noise is calculated, and a main source of the noise in the boiler is determined. The method can be used for accurately identifying the source of the noise inside the waste heat boiler of a gas turbine.

Description

technical field [0001] The invention relates to a method for identifying a noise source inside a waste heat boiler, belonging to the technical field of boiler noise identification. Background technique [0002] With the development of China's urbanization process and the increase of urban electricity demand, gas turbine power plants, which are relatively clean power plants, are getting closer and closer to residential areas. Waste heat boiler is an important part of gas turbine power plant. Compared with gas turbine and cooling tower, although the noise sound pressure level of waste heat boiler is relatively small, its sound radiation area is larger, and the sound pressure level is far higher than the general environmental regulations. Therefore, the effective control of waste heat boiler noise is a key part of the noise control of the entire power plant. If it is not well controlled, the noise pollution it produces will endanger the health of people in nearby residential ar...

AI Technical Summary

Problems solved by technology

The above method does not consider the regenerative noise inside the boiler. It is considered that the exhaust noise of the gas turbine is the main noise source in the furnace, and the noise source in the furnace cannot be accurately found, so the corresponding noise reduction measures cannot effectively reduce the noise of the waste heat boiler.

Images