共查询到19条相似文献,搜索用时 93 毫秒
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变电站环境噪声评价与防治 总被引:2,自引:0,他引:2
通过对变压器的噪声频谱分析,评价出适合的变压器吸声隔声材料;讨论了变电站厂界噪声超标的原因,并分析变压器噪声污染的主要来源,提出了变电站噪声治理方法. 相似文献
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分别介绍了南泥沟(慧祥)110kV变电站的工程情况、束腔共振消声技术及其在变电站中的应用.噪声控制工程的最终测试结果证明,该噪声控制方案是成功的. 相似文献
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在分析了电站锅炉送风机主要噪声源及频谱、噪声特性的基础上,应用噪声控制理论,设计并实施了噪声控制方案,达到了预期的治理效果。电站锅炉风机及管路系统均为中低频噪声,其特点为振动和空气流体混合噪声,噪声衰减慢,传播远。SDR型阻尼吸隔声材料为多层复合分子材料,内设不同孔径、孔型的声学结构。适用于风机、管道、球磨机等壳体结构的减振降噪。使用阻尼胶粘剂粘贴在声源设备壳体表面,辅加吸音棉材料和彩钢外壳约束固定。主要应用于电站锅炉一次风机、吸风机、送风机及其管道减振降噪方面。该技术的特点是在风机和管道等声源表面形成一个吸隔声体,使噪声在声腔内部被吸收和隔绝对外传播。 相似文献
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我厂从日本引进的48万吨/年尿素生产装置的包装机,既有机械性噪声、电磁性噪声,又有电磁阀的气体喷射噪声(空气动力性噪声)。经现场测定,距包装机100毫米处,前两种噪声之和只有82分贝(A)、85分贝(B)和88分贝(C),符合我国《工业企业噪声卫生标准》的要求。但距电磁阀排气中心线45°、100毫米 相似文献
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辽宁轮胎厂对动力站噪声进行分步进行治理,通过采取吸声、消声和隔声措施,使动力站的混响噪声得到了大幅度下降,达到了国家标准,取得了预期的效果。 相似文献
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对RHONE-POULENC白炭黑公司的干燥系统进行了噪声综合治理。主要措施有:大型引风机隔声罩、引风机排气筒消声塔,加热炉和鼓风机隔声机房,雾化加速器活动隔声罩,管道隔声包扎等。治理后厂界噪声由74dB(A)降至45dB(A)。 相似文献
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Takashi Yamamoto Atsushi Ohara Yukio Noma Katsushi Nishizawa Akio Yasuhara Shin-ichi Sakai 《Journal of Material Cycles and Waste Management》2007,9(2):188-193
The photodegradation of tetraphenyltin (TePT) contained in polychlorinated biphenyl (PCB)-based transformer oil simulants
by ultraviolet (UV) irradiation in alkaline 2-propanol solutions was examined. In the absence of PCBs, the TePT level fell
to below 1% of the initial concentration within 30 min. In the absence of both PCBs and an alkali, the concentrations of tri-,
di-, and monophenyltins initially increased to a few milligrams per liter, and then reduced to below the detection limits
within 90 min. The addition of an alkali to the reaction solution slightly accelerated the photodecomposition of TePT. The
decomposition of other phenyltins (PTs) was also accelerated. When PCBs with concentrations of approximately 80 times the
initial TePT concentration were added, only a small fraction of the TePT decomposed within 100 min. Moreover, the levels of
PTs did not change during irradiation. TePT and other PTs did decompose when the level of PCBs was reduced to the same concentration
as that of TePT; however, the decomposition rates were slower than those in the absence of PCBs. In the actual treatment process,
TePT and other PTs in PCB-based transformer oil are decomposed by catalytic reduction, which is used after UV irradiation.
Therefore, in the actual treatment of PCB-based transformer oil wastes, pollution due to PTs can be prevented. 相似文献
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针对500kV变电站内产生较高工频磁场强度的电气设备——35kV并联电抗器,研究不同类型、不同排列方式下35kV并联电抗器周围工频电磁场分布规律。结果表明,35kV并联电抗器的电磁场强度随着离开电抗器中心距离的增加而降低,三角形排列的电抗器磁场强度大于水平排列的。 相似文献