Noise control method of wideband composite sound absorption structure-based steam turbine generator unit

A turbo-generator set and noise control technology, applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of skin irritation, high water absorption, easy deformation and blockage, etc., and achieve noise reduction and noise reduction effects Obvious and economically beneficial effect

Inactive Publication Date: 2015-02-18
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Application Information

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Problems solved by technology

However, since the porous sound absorbing body is mostly made of glass wool, slag wool, and foam plastic, it is irritating to the skin, has a high water absorption rate, and is easy to deform and block, and is limited by the use environment.

Method used

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  • Noise control method of wideband composite sound absorption structure-based steam turbine generator unit
  • Noise control method of wideband composite sound absorption structure-based steam turbine generator unit
  • Noise control method of wideband composite sound absorption structure-based steam turbine generator unit

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Experimental program
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Embodiment

[0018] 1 Noise analysis

[0019] The near-field noise of the steam turbine unit is evaluated by the noise level 1 meter away from the unit. The operators of this unit work 8 hours a day and are exposed to the noise field. The maximum allowable noise level under this condition is 90dB(A). Due to the limitation of the site near the unit, the measuring points of the unit are arranged as follows figure 1 .

[0020] The original noise value is shown in the figure, the noise of the entire steam turbine unit far exceeds the standard value of 90dB, and the average noise value reaches 111.5 dB, especially the noise value of measuring point 2 reaches 118dB, which shows that the exhaust port of the steam turbine under the same environment and the noise level at the generator is maximum. In order to analyze the noise components of the unit, the noise spectrum test was carried out on the three measuring points 2, 4, and 6 respectively. The results are shown in Table 1:

[0021] Table 1...

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Abstract

The invention discloses a noise control method of a wideband composite sound absorption structure-based steam turbine generator unit and relates to a noise control method. The method comprises the following steps of analyzing noise: evaluating the near-field noise of a steam turbine unit by the noise level which is 1 meter from the unit; calculating theory of a composite sound absorption structure: calculating a perforation plate sound absorption coefficient; optimizing the composite sound absorption structure: combining different sound absorption structures through calculation, wherein the sound absorption structures are combined in two ways of combining dual-layer perforation plates, and combining the perforation plates and porous sound absorption materials. According to the method provided by the invention, a noise source a field and a propagation path on site are detected and analyzed, so that the noise reducing effect is obvious, the requirement of national technological standard can be met, and reference is provided to noise treatment of other steam turbine units. The method is particularly suitable for controlling noise of large equipment, such as a steam turbine, a wind power machine and a blower.

Description

technical field [0001] The invention relates to a noise control method, in particular to a noise control method based on a broadband composite sound-absorbing structure turbogenerator set. Background technique [0002] With the rapid development of industry, construction, and transportation, noise has become one of the four major public hazards of the human environment, and humans are increasingly urgent to control noise. Among them, the impact of severe noise pollution such as steam turbine noise on operators and the surrounding environment has increasingly attracted people's attention. As early as 1967, the United States formulated the first standard to limit the noise of steam turbines, and my country also issued a national standard in 1993. To control the noise of steam turbine units, it is necessary to understand the noise level, distribution law, spectrum characteristics of the unit, and the characteristics of various sound-absorbing materials in order to formulate co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N1/10
Inventor 刘欢王健王庆辉李金凤郭烁张琳琳
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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