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冶金烧结过程的尘源特点分析 | 2013-5-6 8:55:00
冶金企业烧结厂产生的粉尘量大,影响面广,治理困难,危害严重,是目前冶金企业中粉尘污染最严重的单位之一。如一台75m2的烧结机,每小时产生的废气达3.9 ×105 rn3,散落的粉尘约1.5 t。分析冶金企业烧结生产的尘源特点,落实有效的防除尘措施很有必要。
冶金烧结生产过程的尘源特点
1.烧结生产过程的主要尘源是:
①烧结机主烟道排气中的粉尘;
②烧结机和冷却机尾部卸料时产生的粉尘;
③烧结矿筛分时产生的粉尘;
④成品和返矿运输过程产生的粉尘;
⑤一次混合废气中的粉尘;
⑥烧结用原料、熔剂、燃料的卸车、加工(破碎、筛分)和运输过程产生的粉尘;
⑦干式除尘器的排灰处理;
⑧二次扬尘。
2.各种尘源都有它的特点:
原料准备系统的尘源多而分散;
混合料系统,特别是热返矿参加混合时尘气共生,排气具有高温、高湿和较高的含尘浓度,烧结矿系统的废气量大、温度高,含尘浓度大,由于目前多生产自熔性或高碱度烧结矿,因而产生的粉尘比电阻高。
此外,烧结粉尘磨损性强,废气中含SO2、CaO,易产生腐蚀与结垢,使烧结粉尘的治理造成一定的困难。
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