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湿电除尘技术   众鑫棋牌 > 湿电除尘技术

王天义强调钢铁工业要结合自身实际慎重选择治理技术

[2018-10-29] 点击:

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“在烟气治理过程中,钢铁企业要高度重视源头减量和过程控制技术的应用,同时要结合自身实际,慎重选择治理技术,不要盲从,只有这样,才能达到事半功倍的效果。”中国金属学会专家委员会主任王天义在近日召开的2018钢铁工业绿色制造发展高端论坛暨全国冶金能源环保会议上,对当前钢铁工业主要的烟气治理技术进行了介绍,并谈了他对烟气治理的一些思考与看法。

钢铁工业须抓紧落实超低排放改造方案

WANGTIANYIZHICHU,MUQIANWOGUOGANGTIECHANNENG90%YISHANGSHI“GAOLULIANTIE→ZHUANLULIANGANG”ZHANGLIUCHENG。ZAIGANGTIESHENGCHANQUANLIUCHENGZHONG,TIEQIANXITONGWURANWUPAIFANGLIANGZHANZONGPAIFANGLIANGDE90%。ANNIANCHAN7YIDUNSHENGTIEZHEIYISHUZHIJINXINGGUSUAN,WOGUOMEINIANCHANSHENGDEFENCHENLIANGYUEWEI100WANDUN、ERYANGHUALIULIANGYUEWEI160WANDUN、DANYANGHUAWULIANGYUEWEI60WANDUN。YANQIZHILI,TEBIESHITIEQIANXITONGDEYANQIZHILISHIDANGWUZHIJI。GANGTIEGONGYEYAOSHENKERENSHIDAOQIJINPOXING,ZAIMANZUDANGQIANGUOJIAHEDIQUPAIFANGBIAOZHUNDEJICHUSHANG,ZHUAJINLUOSHI《GANGTIEQIYECHAODIPAIFANGGAIZAOGONGZUOFANGAN》。

王天义表示,《钢铁企业超低排放改造工作方案》有4大特点——

一是目标要求高。该方案所定标准不仅比现行国家标准有了大幅度提高,而且远高于国外标准。

二是涵盖范围广。该方案不仅涵盖了钢铁生产全流程,而且进一步细化了各工序内的指标,包括有组织、无组织排放源和运输污染源。

三是考核办法严。该方案明确要求95%以上小时均值排放浓度必须达标。

四是时限要求明确。该方案针对不同地区分别制定了2020年10月底、2022年底和2025年底的时限要求。

钢铁企业超低排放改造行势严峻

烟气的源头和末端治理技术

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ZAIYANQIMODUANZHILIFANGMIAN,WANGTIANYIJIESHAOLEDANJIXIFUHUOXINGTANYANQIXIETONGJINGHUACHULIJISHU、ERJIXIFUHUOXINGTANYANQIXIETONGJINGHUACHULIJISHU、NILIUHUOXINGTANYANQIJINGHUAJISHU、XUNHUANLIUHUACHUANGYANGHUATUOLIUTUOXIAOYITIHUAJISHU(FOSSFA)DENG。

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WANGTIANYIZAIJIESHAOBEIJINGZHONGJINGHUANBAOYANFADEXUNHUANLIUHUACHUANGYANGHUATUOLIUTUOXIAOYITIHUAJISHU(FOSSFA)SHIBIAOSHI,MUQIANGAIJISHUYIZAITANGSHANDELONGGANGTIEDESHAOJIEJISHANGDEYIYINGYONG,KESHIYANQIZHONGKELIWUNONGDUDADAO7.9HAOKE/BIAOZHUNLIFANGMI、ERYANGHUALIUNONGDUDADAO0HAOKE/BIAOZHUNLIFANGMI、DANYANGHUAWUNONGDUDADAO43.03HAOKE/BIAOZHUNLIFANGMI,DANYINQUQIYESHIDIKAOCHASHIXIANGGUANXIANGMUGANGYUNXING1GEDUOYUE,QIXIAOGUOWENDINGXINGHAIYOUDAIJINYIBUGUANCHA。

3种主要烟气治理技术优缺点

王天义介绍,目前,我国钢铁工业在烧结烟气超低排放治理方面的主流技术方案有3种形式:活性炭法、SCR(选择性催化还原)法和氧化法。

WANGTIANYIBIAOSHI,HUOXINGTANFAYOUYUKESHIXIANDUOWURANWU(RUERYANGHUALIU、DANYANGHUAWU、ERKOUEYING、ZHONGJINSHUDENG)DEXIETONGZHILIHEWURANWUDEZIYUANHUALIYONG,QIESHIYONGGUOCHENGZHONGBUCHANSHENGGUTIFEIQIWU,ERSHOUDAODADUOSHUDAXINGGANGQIDETUICHONG。DANYUCITONGSHI,HUOXINGTANFAYECUNZAIZHEYIXIEBUZU,BIRU,QIYAOSHIXIANTUOLIUXIAOLV、KELIWUPAIFANGWENDINGDABIAO,RENGXUJINYIBUDEYOUHUA;ZAIYUNXINGCAOZUOGUANLIBUDAOWEISHI,CUNZAIZHEYIDINGDEANQUANYINHUAN;ZAIZHISUANSHICUNZAIFEISHUICHULIJISUANDELIYONGDENGWENTI。

王天义认为,钢企通过增加催化剂数量、提高反应温度、增加湿式电除尘设备等措施,并以SCR法为核心,结合其他各种脱硫脱硝工艺,能够达到超低排放的要求。但需要指出的是,SCR法不可避免地会产生固体废弃物,且SCR法所使用的催化剂在使用寿命到期后,大多属于危废,在回收处理上有一定的难度;催化剂催化效果对烟气温度有一定的要求,在低温催化剂不太成熟的情况下,需对烟气进行升温处理,会在一定程度上增加能耗;对烟气中其他污染物(如二口恶英、重金属等)处理效果尚待验证;一次性投资和运行成本较高。

王天义指出,通过对多种氧化法烟气治理装置效果进行实地调研发现,总体来看,臭氧结合其他脱硫技术的工艺一次性投资、运行成本较低,工期快,受到一些地区钢企的青睐。但该方法的缺点主要有:脱硝效率普遍相对较低,基本在50%左右;在生产过程中容易产生拖尾现象(排放出的烟气颜色发黄);会产生大量的固体废弃物,等等。

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