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燃气发电机噪音太大的原因?

来源:http://www.huannengpower.com   发布于:2018-09-11

燃气发电机组噪声是燃气发电机组的主要噪声来源,燃气发电机组噪声可分为空气动力噪声、燃烧噪声、机械噪声、排气噪声和振动噪声。空气动力噪声主要包括进、排气和风扇旋转引起的空气振动噪声,这部分噪声直接向空气中传播。气缸内燃烧所形成的压力振动通过缸盖,机体向外辐射的噪声叫燃烧噪声;活塞对缸套的撞击,配气机构、喷气系统等运动部件产生的撞击振动噪声统称为机械噪声。机组工作时,废气从排气门高速冲出,沿排气歧管进入消声器,后从尾管排入大气。

The noise of gas generator set is the main noise source of gas generator set. The noise of gas generator set can be divided into aerodynamic noise, combustion noise, mechanical noise, exhaust noise and vibration noise. Aerodynamic noise mainly includes air vibration noise caused by intake, exhaust and fan rotation, which propagates directly into the air. The pressure vibration produced by combustion in cylinder is called combustion noise when it passes through cylinder head, and the noise radiated from cylinder block is called combustion noise. When the unit works, the exhaust gas rushes out of the exhaust valve at high speed, enters the muffler along the exhaust manifold, and finally discharges into the atmosphere from the tail pipe.

排气噪声是发动机的大噪声,往往比发动机主机噪声高15 dB(A)左右,其次分别是燃烧噪声和机械噪声、风扇噪声、进气噪声。原来的消声器以阻性消声为主,功耗大,消声效果不理想。经仔细论证,应用三级组合降噪技术,将消声器改造为新型组合式消声器。该组合式消声器的主要组成部件有对喷消声减振腔、多孔式消声罩及吸声隔热层和吸声共振板等。声源通过第一级的对喷消声减振腔,可将中低频声源的噪声能量充分进行抗性耗散。

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Exhaust noise is the biggest noise of the engine, which is usually 15 dB (A) higher than the main engine noise, followed by combustion noise and mechanical noise, fan noise, air intake noise. The original muffler is mainly based on resistive noise elimination, with high power consumption and poor noise elimination effect. After careful demonstration, the three level combined noise reduction technology is used to transform the muffler into a new combined muffler. The main components of the combined muffler are the muffler cavity, the muffler cover, the sound insulation layer and the sound absorption resonance plate. The noise energy of the medium and low frequency sound source can be fully dissipated by the first stage of the Counter-jet noise absorption cavity.

二级的多孔式阻性消声罩可消去大部分高频噪声,增加了消声器对高频的适应性,而且在该腔内装有高效吸声材料,可对噪声进行充分的吸收和变向,从而大限度地消耗噪声能量。第三级为专门为燃气发电机设计的带共振板的排气管,进一步通过薄片的振动进行消声。经测试,新型消声器的消声量、消声频率范围(主要为消声量峰值的频率范围)及阻力损失三大指标均优于原来的消声器。

The second-stage porous resistance muffler can eliminate most of the high-frequency noise, increase the muffler's adaptability to high-frequency, and equipped with high-efficiency sound absorbing materials in the cavity, can fully absorb and change the direction of the noise, thereby maximizing the consumption of noise energy. The third stage is an exhaust pipe with resonant plates designed for gas generators, which is further silenced by the vibration of thin sheets. Tests show that the new muffler is superior to the original muffler in terms of muffling capacity, muffling frequency range (mainly the peak frequency range of muffling capacity) and resistance loss.

此外该消声器尺寸适宜,结构刚性好,安装方便,并具有抑制再生噪声的功能。而且后部的吸声隔音层具有防腐性能,可有效地克服烟气的低温露点腐蚀,延长了消声器的使用寿命。基于燃气发电机组的工作原理,难以用降低声源噪声的方法来消声,所以主要是要有效阻断其噪声传播途径。消声技术的核心就是利用声波在传播中自然衰减的规律去缩小噪声的污染面。具体降低噪声的方法有以下几种:吸声、隔声及改变噪声传播方向。在实际工程应用中往往只用其中一种,本文采用三种方法并用的措施,针对燃气发电机组提出了新型组合降噪技术。

In addition, the muffler has the advantages of suitable size, good rigidity, convenient installation, and the function of suppressing regeneration noise. Moreover, the sound absorption and insulation layer at the rear has anti-corrosion property, which can effectively overcome the low temperature dew point corrosion of flue gas and prolong the service life of the muffler. Based on the working principle of gas-fired generator set, it is difficult to use the method of reducing the noise of sound source to eliminate noise, so the main way is to effectively block its noise transmission. The core of anechoic technology is to use the natural attenuation law of sound wave to reduce the noise pollution surface. Specific ways to reduce noise include the following: sound absorption, sound insulation and changing the direction of noise propagation. In practical engineering applications, only one of them is often used. In this paper, three methods are adopted and a new combined noise reduction technology is proposed for gas-fired generating units.

控制机械噪声和燃烧噪声的有效办法是对机组进行隔振处理。燃气机、发电机与钢制底盘间装设复合隔振减振垫,底盘与基础之间亦垫上高效减振胶垫。经过两级隔振处理,不仅使机组的振动被有效隔断,而且使机组运行更加平稳,整体噪声显著降低。燃气发电机组工作在封闭的机房里面,从广义上讲,进气系统包括燃气发电机组的进风通道和发动机的进气系统。进风通道和排风通道一样直接与外界相通,空气的流速很大,气流的噪声和机组运转的噪声都经进风通道辐射到外面。发动机进气系统的噪声是由进气门周期性开、闭而产生的压力波动所形成,其噪声频率一般处于500 Hz以下的低频范围。

An effective way to control mechanical noise and combustion noise is vibration isolation. The gas engine, generator and steel chassis are equipped with composite vibration isolation cushion, and the chassis and foundation are also padded with high-efficiency damping rubber cushion. After two-stage vibration isolation, not only the vibration of the unit is effectively isolated, but also the unit runs more smoothly and the overall noise is significantly reduced. Gas-fired generator unit works in a closed room. Generally speaking, the air intake system includes the air intake channel of gas-fired generator unit and the air intake system of engine. The inlet and exhaust passages are directly connected with the outside world, and the air velocity is very high. The noise of the air flow and the noise of the unit operation are radiated through the inlet passage to the outside. The noise of the engine intake system is caused by the pressure fluctuation caused by the periodic opening and closing of the intake valve, and its noise frequency is generally in the low frequency range below 500 Hz.

在机房墙上设置了两个消声进气道,分别作为机房的进风口和发动机的进气口。由于排风造成的室内负压,使冷空气自然通过消声进气道进入机房内,将机体散发的热量顺利排出。从而保证了机房内有足够的新鲜空气。风扇噪声是由旋转噪声和涡流噪声组成。旋转噪声由旋转风扇叶片切割空气流产生周期性扰动而引起。涡流噪声是在旋转叶片截面上发生边界层分离时,气体滑脱或分裂而成的一系列的漩涡流,从而辐射出一种非稳定的流动噪声。排风道直接与外界相通,空气流速很大,气流噪声、风扇噪声和机械噪声经此通道辐射出去。

Two anechoic inlets are arranged on the wall of the engine room as the air inlet of the engine room and the air inlet of the engine respectively. Due to the negative indoor pressure caused by exhaust air, cold air naturally enters the engine room through the anechoic inlet, and the heat emitted by the body is discharged smoothly. This ensures that there is enough fresh air in the computer room. Fan noise is composed of rotary noise and eddy noise. Rotating noise is caused by periodic disturbance of air flow cutting by rotating fan blades. Eddy current noise is a series of eddies formed by gas slipping or splitting when boundary layer separation occurs on the section of rotating blade, thus radiating an unsteady flow noise. The exhaust duct is directly connected with the outside world, and the air velocity is very high. The airflow noise, fan noise and mechanical noise radiate out through this passage.

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This article is compiled and published by the gas generator set, do you know something about it? For more information, please click: http://www.huannengpower.com, we will have more exciting content for you to see.


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