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Design method, structure and application of perforated sound absorber inside waste heat boiler

A technology of waste heat boiler and design method, which is applied to the components of steam boilers, steam boilers, steam boiler accessories, etc., and can solve the problems of high cost, general noise reduction effect, and inability to find out the noise of waste heat boilers, etc.

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

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Problems solved by technology

[0004] The object of the present invention is to provide a design method, structure and application of a perforated sound-absorbing body used in the waste heat boiler, which can effectively solve the problems existing in the prior art, especially the root cause of the noise of the waste heat boiler cannot be found out. Targeted noise reduction, resulting in general noise reduction effect and high cost

Method used

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  • Design method, structure and application of perforated sound absorber inside waste heat boiler
  • Design method, structure and application of perforated sound absorber inside waste heat boiler
  • Design method, structure and application of perforated sound absorber inside waste heat boiler

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Embodiment 1

[0057] Embodiment 1 of the present invention: the design method of the perforated sound absorbing body used inside the waste heat boiler, such as Figure 1 ~ Figure 3 shown, including the following steps:

[0058] a. Two perforated plates 1 and one liner 2 are provided, and the two perforated plates 1 are attached to both sides of the liner 2 respectively; A rectangular sound-absorbing cavity 3 is formed between 1 and the liner 2; an inner liner 4 with a thickness of 1mm is added to the perforated part of the perforated plate to obtain a perforated sound-absorbing body;

[0059] b. According to the principle of acoustic-electric analogy, construct the equivalent circuit when the sound wave is vertically incident on the perforated sound-absorbing body;

[0060] c. Match and calculate the relative acoustic impedance rate of the perforated plate and the sound-absorbing cavity according to the noise characteristics; wherein, the relative acoustic impedance rate of the perforated ...

experiment example

[0069] Experimental example: 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 sound-absorbing cavity formed by the lining plate. It is a resonant sound-absorbing body, which can be regarded as having Acoustic elements of acoustic resistance and reactance, constructed as figure 1 As shown, the equivalent circuit is as image 3 as shown, image 3 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 sound-absorbing cavity behind the plate, the acoustic impedance rate of the perforated plate is R+jwM, and the acoustic impedance rate of the sound-absorbing 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 ...

Embodiment 2

[0102] Example 2: Identification of Noise Sources

[0103] Due to the coupling of flow, heat, and sound in the furnace, the tube array itself is composed of finned tubes with spiral fins, and its geometric characteristics are complex. The resources required for complete modeling and calculation are too large, so the analysis model is made as follows Simplifications and assumptions:

[0104] 1. According to the relationship between the components of the flue gas, use the gas state equation to calculate the physical characteristics of the flue gas, and find that the difference between its various indicators and air is not more than 5%, and use air instead of flue gas in the calculation;

[0105] 2. Since the heat exchange process itself does not generate noise, it only indirectly affects the physical properties of the flue gas, so the heat exchange between the furnace wall and the pipe wall during the flue gas flow is not considered, and the thermodynamic parameters of the flue ...

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Abstract

The invention discloses a design method, structure and application of a perforated sound absorber inside a waste heat boiler. The perforated sound absorber comprises two perforated plates 1 and a liner plate 2. The two perforated plates 1 are attached to the two sides of the liner plate 2 respectively; the two sides, tightly attached to the perforated plates 1, of the linear plate 2 are respectively of a groove type structure, so that sound absorption cavities 3 are formed between the perforated plates 1 and the linear plate 2; liner pipes 4 are arranged in holes in the perforated plates 1. According to the perforated sound absorber inside the waste heat boiler, the perforated plates are provided with the liner pipes and the small holes, the problem that a traditional multi-hole sound absorber material is prone to blocking is effectively solved, the resonance absorber is formed by the sound absorption cavities formed by the perforated plates and the linear plate, noise produced inside the waste heat boiler can be effectively absorbed, and a part of the noise can be reflected to a noise source.

Description

technical field [0001] The invention relates to a design method, structure and application of a perforated sound-absorbing body used inside 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. [0003] At present, for the noise reduction treatment of the waste heat boiler, since the source of the noise of the waste heat boiler cannot be found out, most of them only use the tight enclosure of the boiler, ...

Claims

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Application Information

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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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