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Method and device for controlling noise in waste heat boiler

A waste heat boiler and internal noise technology, which is applied to steam boiler components, steam boilers, steam boiler accessories, etc., can solve the problems of high cost, noise reduction, and general noise reduction effect, and achieve good low-frequency noise reduction performance

Active Publication Date: 2014-08-06
HUADIAN HEAVY IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method and device for controlling the internal noise of the waste heat boiler, which can effectively solve the problems existing in the prior art, especially that it is impossible to find out the source of the noise of the waste heat boiler for targeted noise reduction, resulting in The problem of general noise reduction effect and high cost

Method used

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  • Method and device for controlling noise in waste heat boiler
  • Method and device for controlling noise in waste heat boiler
  • Method and device for controlling noise in waste heat boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 of the present invention: a method for controlling internal noise of a waste heat boiler, comprising:

[0058] (1) The perforated sound absorbing body is used to eliminate the flow noise caused by the vortex shedding of the tube array. When eliminating the flow noise caused by the vortex shedding of the tube array, the perforated sound absorbing body is arranged at the opposite corner of the cavity between the heat exchange tube layers of the waste heat boiler on the line and perpendicular to the horizontal plane;

[0059] The perforated sound absorbing body 2 (such as Figure 3 ~ Figure 5 shown) includes: two perforated plates 3 and one lining plate 4, the two perforated plates 3 are attached to both sides of the lining plate 4 respectively; both sides of the lining plate 4 close to the perforated plate 3 are groove structures, so A sound-absorbing cavity 5 is formed between the perforated plate 3 and the lining plate 4, and the perforated part on the per...

experiment example 1

[0062]Experimental Example 1: The perforated sound-absorbing body used in the waste heat boiler of the present invention is composed of a perforated plate with a large number of small holes and a cavity 5 formed with the lining plate 4. It is a resonant sound-absorbing body, which can be regarded as Acoustic elements with acoustic resistance and reactance, constructed as image 3 , Figure 4 As shown, the equivalent circuit is as Figure 7 as shown, Figure 7 Among them, R and M are the sound resistance and sound quality of the perforated plate respectively, and Z D is the sound capacity of the cavity 5 behind the plate, the acoustic impedance rate of the perforated plate 3 is R+jwM, and the acoustic impedance rate of the cavity is Z S空腔 , the sound source is the incident sound wave, according to Thevenin's law, the equivalent sound source is the sound pressure and internal impedance of the open circuit (the flow is zero, that is, in front of the solid surface), that is, 2P...

experiment example 2

[0095] Experimental example 2: From the test results, it can be seen that the sound radiation of the chimney has the greatest impact on the sensitive points outside the factory, so it is considered to install a muffler at the connection between the chimney and the furnace chamber to reduce the noise from the boiler body into the chimney.

[0096] Design of resonance mufflers for waste heat boilers:

[0097] Using the principle of the Helmholtz resonator, the sound wave in the pipeline will reflect most of the sound energy back to the direction of the sound source due to the impedance mismatch near the resonance frequency, and the remaining small part of the sound energy will continue to propagate. The design objectives are mainly the resonance frequency and the amount of noise reduction, and the design parameters include the aperture d and thickness t of the perforated plate 3 0 , the perforation rate σ, the longitudinal depth of the cavity D, the flow cross-sectional area S o...

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Abstract

The invention discloses a method and device for controlling noise in a waste heat boiler. The method comprises the steps that flow noise produced by pipe array vortex shedding is eliminated by a perforated sound absorber and transmission of the noise in a boiler chamber to a chimney is reduced by a resonance type silencer, wherein the perforated sound absorber is formed by attaching two perforated plates to the two sides of a liner plate respectively, the resonance type silencer is composed of double-faced perforated sound absorbing plates and single-faced sound absorbing structures, and the double-faced perforated sound absorbing plates and the single-faced sound absorbing structures are arranged in the boiler chamber. The resonance type silencer has the better low-frequency silencing performance, noise transmitted from a chimney opening has the noise reduction amount of 14 dB(A) on an octave band of 63 Hz, and noise at the boundary of an enterprise nearly reaches a production standard. The perforated sound absorber can effectively absorb the noise produced by the inner portion of the waste heat boiler and a part of the noise is reflected to a noise source. In addition, compared with the prior art, the noise reduction investment cost is reduced by at least 1 / 3.

Description

technical field [0001] The invention relates to a method and device for controlling internal noise of a waste heat boiler, and belongs to the technical field of noise treatment of waste heat boilers. Background technique [0002] Waste heat boilers can reutilize the waste heat generated after gas-fired power generation to improve power generation efficiency, thus making waste heat boilers more and more widely used in the field of power generation. However, the waste heat boiler will generate a lot of noise during the use process, which seriously affects the work and life of the surrounding residents. Therefore, if the waste heat boiler is to be used for long-term power generation, noise reduction treatment must be carried out. Through the noise monitoring of the waste heat boiler, it is found that the sound radiation of the chimney has the greatest impact on the sensitive points outside the plant. [0003] At present, for the noise reduction treatment of the waste heat boil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B37/00
Inventor 赵迎九黄福安钟振茂任玉凤魏普余平覆王奇
Owner HUADIAN HEAVY IND CO LTD
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