空气储能电厂中透平压缩机放空噪声控制

在空气储能电厂中,透平压缩机的放空噪声排放存在噪声污染、健康影响、生态影响等问题。全面分析透平压缩机放空噪声控制方式,并提供噪声治理思路,为进一步提高空气储能电厂的环境声学性能奠定基础。

放空噪声及其危害

本文着重论述了石油化工厂火炬噪声和放空噪声对环境的影响分析,通过石油化工厂的火炬噪声和放空噪声的实测数据进行多元线性回归,取得了Leq,L_(50)同距离的线性方程,并探讨了计算模式以及对其进行了分析,提出了治理方法,并针对计算模式的进一步探讨以及治理噪声进行了讨论,对噪声环境预测给出理论计算对比值,为此更加充实和完善噪声预测,使噪声评价值趋于可靠,准确。

压气机放空消声器的研究与计算

介绍了压气机放空消声器的计算方法以及典型结构,给出了一些适用的计算公式及实验数据。该消声器成功应用于哈药集团制药总厂压气机上,效果良好。

节流降压-小孔喷注消声器优化设计与模态分析

对AG-35/39M1型锅炉排气放空噪声进行测量,并进行频谱分析,找出主要噪声源发生在频率为1118 Hz处。根据其频谱特性和排气放空噪声产生机理及喷注噪声具有的声级高(140 dB左右)、频率宽、传播远、影响范围大等特点,优化设计了节流降压-小孔喷注复合式消声器,并采用锤击法对消声器试件进行实验模态分析及消声特性试验,可知其频率远远避开了噪声的峰值频率,消声器不会在噪声峰值时产生共振,为设计出结构合理、性能优良的消声器提供了可靠依据。

Evolution of low-frequency noise passing through a spatial filter in a high power laser system

The theoretical model of spatial noise passing through a spatial filter is established in high power laser system under the small signal approximation. The transmission characteristic for a noise signal passing through spatial filters with different magnifications is analyzed by numerical simulation, according to the actual structure of the high power laser system. The results show that the spatial modulation period of low-frequency noise getting through the pinhole will be proportional to the magnification of the spatial filter. When the magnification is less than 1, the safe low-frequency noise will be extruded into the high-frequency region, which is the fast increasing part, and finally develops into the most dangerous part which can damage the optical devices. The conclusion of this research improves the relay imaging theory of a spatial filter and provides an important theoretical basis for a general design of high power laser systems.