多宝鱼虾蟹

水泥厂氮氧化物到底怎么来?特别排放值推广后怎么办?

2018-05-30  来自: 洛阳新美环境技术有限公司 浏览次数:331

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YINDANYANGHUAWUYOUDUOZHONGCUNZAIXINGSHIQIEJIBUWENDING,GUTONGCHANGYONGNOXLAIBIAOSHI,RENLEIHUODONGPAIFANGDENOxZHUYAOLAIZIGEZHONGRANSHAOGUOCHENG,QIZHONGYIGONGYEYAOLUHEQICHEPAIFANGDEWEIZUIDUO。ZAIZHIYEHUANJINGZHONGJIECHUDESHIJIZHONGQITIHUNHEWUCHANGCHENGWEIXIAOYAN(QI),ZHUYAOWEIYIYANGHUADANHEERYANGHUADAN,BINGYIERYANGHUADANWEIZHU。

NOxDEWEIHAIDUOZHONGDUOYANG,TONGGUOHUXIJINRURENTIFEIDESHENBU,KEYINQIZHIQIGUANYANHUOFEIQIZHONG,HAINENGHEDAQIZHONGQITAWURANWUFASHENGGUANGHUAXUEFANYINGXINGCHENGGUANGHUAXUEYANWUWURAN。N2OZAIDAQIZHONGJINGYANGHUAZHUANBIANCHENGXIAOSUAN,SHIZAOCHENGSUANYUDEYUANYINZHIYI,N2OHAIKESHIPINGLIUCENGZHONGCHOUYANGJIANSHAO,CONGERSHIDAODADIQIUDEZIWAIXIANFUSHELIANGZENGJIA。

水泥工业氮氧化物的来源有哪些?

通常在不采取任何NOx控制措施时,我国新型干法水泥生产系统NOx的排放浓度多为500~1200mg/Nm3;对于燃用无烟煤和含氮较高的燃料,再加上煅烧高标号水泥熟料、特种水泥熟料以及高硅或高饱和比要求的水泥企业,其NOx的排放浓度远远超过400mg/Nm3的控制标准。

ZAISHUINISHULIAODEDUANSHAOGUOCHENGZHONG,HUICHANSHENGDALIANGDEDANYANGHUAWU,ZHEIXIEDANYANGHUAWUZHUYAOSHINOHENO2,QIZHONGNOYUEZHAN90%YISHANG,ERNO2ZHIYOU5%~10%。ANQILAIYUANHUAFENZHUYAOQUJUEYUYUAN、RANLIAOZHONGDANDEHANLIANG、RANSHAOWENDUDEGAODIHERANLIAOLEIXING。

(1)原、燃料NOx

SHUINISHENGCHANSHIYONGDEYUANRANLIAOJUNLAIZIYUZIRANJIE,QIZHONGBUKEBIMIANDEHUIHANYOUYIDINGLIANGYOUJIWUHEDIFENZIHANDANHUAHEWU,YOUGAIBUFENDANYUANSUZHIJIEZHUANHUADENOxCHENGWEIYUAN、RANNOx。YUANLIAOZHONGDEDANZHUYAOLAIYUANYUKUANGSHICHENJIDEHANDANHUAHEWU,QIHANDANLIANGYIBANZAI20~100ppm(BAIWANFENZHI20~100)。RANLIAOZHONGDEDANZHUYAOWEIYOUJIDAN,SHUYUANZU(N-HHEN-CLIAN)HUOQINGHUAWUZU(C=NLIAN)DENG,QIHANLIANGYIBANZAI0.5%~2.5%。

(2)热力型NOx

RELIXINGNOxYOUKONGQIZHONGDEDANQIHEYANGQIZAIGAOWENXIAFASHENGHUAXUEFANYINGERLAI,QISHENGCHENGSUDUYUWENDUDEGUANXISHIYOUJIELIDAOWEIQITICHULAIDE,YINCICHENGWEIJIELIDAOWEIQIJILI。DANGRANSHAOWENDUDIYU1 500℃SHI,JIHUGUANCEBUDAONOxDESHENGCHENG,DANGWENDUGAOYU1500℃SHI,WENDUMEISHENGGAO100℃,FANYINGSULVJIANGZENGDA6~7BEI。YINCI,RELIXINGNOxZHUYAOZAIRANSHAODEGAOWENQUCHANSHENG,RANSHAOWENDUDUIQICHANSHENGLIANGJUYOUJUEDINGXINGDEYINGXIANG。CIWAI,RELIXINGNOxDECHANSHENGNONGDUHAIYUN2、O2NONGDUJITINGLIUSHIJIANYOUGUAN。

(3)快速型NOx

多宝鱼虾蟹ZAIQIANYANGHUANJINGXIA,RANLIAOZHONGDETANQINGHUAHEWURANSHAOFENJIESHENGCHENGCH、CH2YIJIC2DENGJITUAN,TAMENYUDANFENZI,YIJIO、OHDENGYUANZIJITUANFANYINGERZAIHENDUANDESHIJIANNEIDALIANGCHANSHENGNOx,CHENGWEIKUAISUXINGNOx。KUAISUXINGNOxDUIWENDUDEYILAIXINGHENRUO,TADESHENGCHENGLIANGYIBANZONGNOxSHENGCHENGLIANGDE5%YIXIA。

水泥厂氮氧化物到底怎么来?特别排放值推广后怎么办?_除尘设备_脱硫设备

多宝鱼虾蟹SHENGLIAOJINGXUANFUYUREQIYUREHOU,JINRUFENJIELUNEIFASHENGFENJIEFANYING, RANHOUCONGYAOWEIJINRUHUIZHUANYAOZHONG,ZAIHUIZHUANYAONEIWANCHENGSHAOCHENGGUOCHENG,ZUIZHONGXINGCHENGSHULIAOBINGCONGYAOTOUXIERULENGQUEJI。MEIFENZAIHUIZHUANYAOYAOTOUJIFENJIELULIANGCHURANSHAO。XINXINGGANFASHUINIYAOXITONGZHONGNOxZHUYAODECHANSHENGQUYUZAIHUIZHUANYAOHEFENJIELULIANGCHU。FENJIELUNEIWENDUJIAODI(XIAOYU1200℃),ZHUYAOYIRANLIAOXINGNOxWEIZHU;HUIZHUANYAONEICHUCHANSHENGRANLIAOXINGNOxWAI,QINEIZUIGAOQITIWENDUKEDA2200℃,HUISHENGCHENGDALIANGDERELIXINGNOx。

需要指出的是,由于对水泥窑烧成系统的研究还处在较为粗放的状态,当前国内水泥行业对窑内工况和氮氧化物的生成机理,仍然存在很多的不足。甚至关于关于热力型氮氧化物产生量与原、燃料氮氧化物产生量熟多熟少,也存在争论。但是总体来讲,氮氧化物的来源是多方面的,影响因素众多,氮氧化物来源比例除了烧成系统本身的结构以外,也与工况环境,原燃料差异甚至操作人员水平息息相关。

YEZHENGYINWEIRUCI,DANYANGHUAWUYUANTOUZHILIXIANDEXIANGDANGKUNNAN,MUQIANYENEITUOXIAOYEZHUYAOJIZHONGZAIMODUANZHILI。


怎么降低氮氧化物的排放?

多宝鱼虾蟹SHUINIXINGYEMUQIANRENGSHIXINGGB 4915-2013DAQIWURANWUPAIFANGBIAOZHUN,KELIWU、ERYANGHUALIU、DANYANGHUAWUSANXIANGWURANWUPAIFANGZHIBIAOFENBIEWEI30mg/m3、200 mg/m3HE400 mg/m3,ZHONGDIANQUYUZHIXING20mg/m3、100 mg/m3HE320mg/m3BIAOZHUN。

JINNIANYILAI,DUOSHENGSHILIANXUCHUTAISHUINIGONGYEDAQIWURANWUTEBIEPAIFANGZHISHISHIJIHUA,YAOQIU1-2NIANNEISHUINIXINGYEQUANBUWANCHENGCHAODIPAIFANGGAIZAO,KELIWU、ERYANGHUALIU、DANYANGHUAWUPAIFANGNONGDUYAOFENBIEBUGAOYU10mg/m3、50mg/m3、100mg/m3。

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根据目前大部分水泥企业的窑况,业内专家表示,以5000t/d生产线为例,颗粒物和二氧化硫的达标排放企业的改造费用分别预计在800万和300万左右,氮氧化物的技改花费的成本则比较高,主流的可以通过SNCR+分级燃烧+低氮燃烧和SCR技术进行改造以达到100mg/m3以下。

SCRXUANZEXINGCUIHUAHAIYUANJISHU,SHIMUQIANSHIJIESHANGDETUOXIAOZHUDAJISHU。YIANSHUIHUONIAOSUWEITUOXIAOJI,ZAIXISHOUTANEIDECUIHUAJIZUOYONGXIAZUOCUIHUAXUANZEXISHOU,TUOXIAOLVKEDA80%~90%。QIBIDUANZAIYURUYANQICHENLIDUSAICUIHUAJICENGWENTI,YANQIZHONGDEJIANXINGWUZHI、CaO、SO2HUISHICUIHUAJIZHONGDUSHIXIAOWENTIDENG。

多宝鱼虾蟹SCRYOUZIJIDEWENDUCHUANGKOU,YIBANZAI250~450 ℃ZHIJIAN。XUYAOQIANGDIAODESHI,DIYUZHEIGEWENDUHUIZENGJIANH3DETAOYILV,DAOZHITUOXIAOXIAOLVXIAJIANG,SHENZHIXINGCHENGNH3HECOWURAN,ERQIECUIHUAJIHUICUSHIYANQIZHONGDESO2ZHUANHUANCHENGSO3,NH3HUIYUSO3FANYINGSHENGCHENGLIUSUANANDUSAICUIHUAJIDEFANYINGTONGDAO;GAOYUZHEIGEWENDU,TEBIESHIGAOYU500 ℃HUIZAOCHENGV2O5SHAOJIEHEHUIFASHIXIAO,ZAOCHENGJIAODASUNSHI。LINGWAI,CUIHUAJIDETOURUDA,ERQIESHOUMINGGUJIZHIYOU3NIANZUOYOUQIEYILAIJINKOU。

SNCR技术是利用分解炉内合适的温度空间(900℃~1 100℃),向其内喷入氨水混合物,在此温度下,氨(NH3)与烟气中NOx反应生成N2和H2O。SNCR不用催化剂,但这有两个技术难点:一是如何保证喷嘴始终处于温度窗口内,二是如何保证所有NOx与NH3有一定时间的充分接触。多宝鱼虾蟹脱硝率一般为50%~80%,氨水消耗量巨大,NH3的逃逸率较高,可达SCR的3倍以上。

DINOxRANSHAOCUOSHIZHUYAOZHENDUIYAOTOURANSHAOQI,YOUDIDANRANSHAO、DIYANGRANSHAO、NONGDANPIANCHARANSHAO、YANQIZAIXUNHUANRANSHAO、TIDAIRANLIAORANSHAODENGCUOSHI。GENJUXIANYOURANSHAOQIDEHAOHUAIHESUOCAIYONGDEDIDANRANSHAOJISHUDELIDUBUTONG,GAIXIANGCUOSHIYIBANNENGJIANGDINOxPAIFANGLIANG5%~30%。FENJIRANSHAOTONGGUOJIANGYAOWAIFENJIELUFENWEIZHUHAIYUANQU、RUOHAIYUANQU、WANQUANRANSHAOQUKONGZHIHAIYUANQIFEN,GENJUFENJIRANSHAOCUOSHIDEHELICHENGDU,GAIXIANGCUOSHIYIBANNENGJIANGDINOxPAIFANGLIANG30%~50%。

在低氮燃烧和分级燃烧的基础上,结合SNCR,在稳定的窑况下,也可实现超低排放,且该方案相比直接更换SCR的成本更低。客观来看,企业应该选择哪种技改方案应该结合企业自身实际来看,仅仅照搬火电行业的经验是不行的。

在经济角度来看,SCR技术仅改造费用预期在3000万左右,另外还有催化剂的成本,远远高于SNCR+其他技术改造费用,但有业内专家表示,SCR是以后的趋势,水泥企业在当前越来越严格的环保趋势和去产能大环境下,选择至关重要。


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关键词: 除尘设备   脱硫设备   脱硝设备   隔音设备