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电子电器废气处理

来源:admin(传梦环保整理发布)   时间:2018-08-28

电子电器废气处理


电子电器废气危害:电子行业主要是元器件组装焊接过程中对大气的污染和电路板等器件清洗等表面处理过程中因使用一些化学药剂(如硫酸、盐酸、氟氯化碳、四氯化碳、三氯乙烷及其他有机卤化物)挥发造成对大气环境的污染,以及整机装配过程中产生的机械噪声和少量粉尘也会造成环境污染,这些污染气体会造成人群慢性或急性中毒。

吸附法处理原理:

(1)直接吸附法:有机废气经活性炭吸附,可达95%以上的净化率,设备简单、投资小,但活性炭更换频繁,增加了装卸、 运输、更换等工作程序,导致运行费用增加。活性炭应用一段时间后吸附容易饱和,废气处理效果会下降,需要定期更换活性炭,所以建议选择更耐用的光氧催化和旋流塔喷淋塔喷淋法。

(2)吸附-回收法:利用纤维活性炭吸附有机废气,在接近饱和后用过热水蒸汽反吹,进行脱附再生;本法要求提供必要的蒸汽量。

(3)新型吸附-催化燃烧法:此法综合了吸附法及催化燃烧法的优点,采用新型吸附材料(蜂窝状活性炭)吸附,在接近饱和后引入热空气进行脱附、解析,脱附后废气引入催化燃烧床无焰燃烧,将其彻底净化,热气体在系统中循环使用,大大降低能耗。本法具有运行稳定可靠、投资省、运行成本低、维修方便等特点,适用于大风量、低浓度的废气治理,是目前国内治理有机废气较成熟、实用的方法。

常见处理方法:有吸附法、吸收法、催化燃烧法、热力燃烧法、生物试剂喷淋法等。

电子电器废气处理

废气介绍:由于电子行业对操作室清洁度要求极高,通常使用风机抽取工艺过程中挥发的各类废气,因此电子行业废气排放具有排气量大、排放浓度小的特点。

主要成分:电子行业废气主要为有机废气和酸碱废气两类。有机类有:非甲烷总烃、氮氧化物、二氧化硫等;酸碱类有:氨气、硫酸雾、氟化物、氯化物、氯气等。

主要来源:在电子行业中造成环境污染的有害气体,主要来源于芯片或者是线路板生产的清洗、均胶、去胶、刻蚀、显影过程中。

电子电器废气处理方案介绍

活性炭吸附:该技术能高效吸收苯、醇、酮、酯、汽油类等有机废气,适用于大风量低浓度的废气治理。该方法是利用活性炭本身高强度的吸附力,结合风机作用将有机废气分子吸附住,对苯、醇、酮、酯、汽油类等有机溶剂的废气有很好的吸附作用。

适用浓度:0-300 mg/m3

适用风量:1000-100000 m3/h

处理效率:80-90%

性能特点:

1.吸附效率高达90%,吸附容量大,适用面广;

2.维护方便,无需过多人力投入要求;

3.比表面积大,良好的选择性吸附,能同时处理多种混合废气;

4.活性炭具有来源广泛价格低廉等特点;

5.操作简易、安全。

光氧催化燃烧:

光化学及光催化氧化法是目前研究较多的一项高级氧化技术。所谓光催化反应,就是在光的作用下进行的化学反应。光化学反应需要分子吸收特定波长的电磁辐射,受激产生分子激发态,然后会发生化学反应生成新的物质,或者变成引发热反应的中间化学产物。光化学反应的活化能来源于光子的能量,在太阳能的利用中光电转化以及光化学转化一直是十分活跃的研究领域。光催化氧化技术利用光激发氧化将O2、H2O2等氧化剂与光辐射相结合。所用光主要为紫外光,包括uv-H2O2、uv-O2等工艺,可以用于处理污水中CCl4、多氯联苯等难降解物质。另外,在有紫外光的Fenton体系中,紫外光与铁离子之间存在着协同效应,使H2O2分解产生羟基自由基的速率大大加快,促进有机物的氧化去除。是净化碳氢化合物废气、消除恶臭的高效手段之一。

适用浓度:≤10000 mg/m3

适用风量:≤50000 m3/h

处理效率:95-99%

热回收率:95-97%

性能特点:

1.去除效率高,无二次污染;。

2.适用范围广泛,可应对多工况条件;

3.转化效率稳定、气流分布合理,保障防爆措施的有效性;

4.起燃温度低、无焰燃烧、降低明火,节省能源的同时又大大提高了安全性。

洗涤塔|喷淋塔|水洗塔|旋流塔板塔:

一般采用气液逆流操作,风机组将收集到的废气吸到废气吸收洗涤净化塔内,经过填料层,废气与吸收液进行气液两相充分接触吸收中和反应,废气经过净化后,再经除雾板脱水除雾后,由风机排入大气。吸收液在塔底经水泵增压后在塔顶喷淋而下,最后回流到塔底循环使用。

适用风量:≤100000m3/h

处理效率:85-99%

性能特点:

1.采用填料塔对废气进行净化,适合于连续和间歇排放废气的治理;

2.工艺简单,管理方便、操作及维修相当方便简洁,不会对车间的生产造成任何影响;

3.适用范围广,可同时净化多种污染物;

4.压降较低,操作弹性大,且具有很好的除雾性能;

5.塔体可根据实际情况采用PP/玻璃钢等材料制作;

6.填料采用高效、低阻的鲍尔环,可彻底地去除气体中的异味、有害物质等;

7.工业废气处理设计周密、层层净化过滤废气,效果较好,去除率可最高可达99%以上。

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