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湿电除尘技术   众鑫棋牌 > 湿电除尘技术

威美湿电转载燃煤热电厂烟气超低排放改造工程实践

[2019-4-9] 点击:

湿电咨询服务: 陶经理18332815001 张经理18633235200

ZHAIYAO:MOURANMEIREDIANCHANGCAIYONGSNCR-SCROUHETUOXIAO+BUDAICHUCHEN+SHIFASHIHUISHI-SHIGAOYANQITUOLIU+SHISHIJINGDIANCHUCHENDEZUHEGONGYIDUIYUANYANQIJINGHUASHESHIJINXINGGAIZAO,YISHIXIANYANQIWURANWUDECHAODIPAIFANG。SUIJICHOUQU1GEYUEDEWURANWUPAIFANGSHUJUJINXINGFENXI,JIEGUOBIAOMING:SO2PAIFANGNONGDUFEICHANGDI,PINGJUNNONGDUJINWEI6.32mg/m3,YINGJINYIBUYOUHUAKONGZHICANSHUSHIXIANJINGJIYUNXING。NOxPAIFANGNONGDUWENDING,98.2%DESHIDUANPAIFANGNONGDU<50mg/m3,DANANTAOYIKONGZHIBULIXIANG。JINGGUOSHIFATUOLIUHESHISHIJINGDIANCHUCHENHOU,96%DESHIDUANFENCHENPAIFANGNONGDU<2.5mg/m3。ZONGHEFENXI,ZUHEGONGYISHIYIZHONGSHIHERANMEIYANQICHAODIPAIFANGGAIZAODEKEKAOGONGYI。

0 引言

JINNIANLAI,WOGUODAQIWURANCHENGXIANFUHEXINGTEZHENG,WUMAIWENTIRIYITUCHU。ERRANMEIYANQIPAIFANGDEFENCHEN、ERYANGHUALIU( SO2) HEDANYANGHUAWU( NOx) DENGSHIZUIZHUYAODEWUMAIQIANQUTI。KONGZHIRANMEIGUOCHENGPAIFANGDEDAQIWURANWUCHENGWEIJIEJUEWUMAIWENTIDEZHONGYAOJUCUO。WEITUIJINMEITANQINGJIEHUALIYONG、GAISHANDAQIHUANJINGZHILIANG,HUANJINGBAOHUBU、GUOJIAFAGAIWEI、GUOJIANENGYUANJULIANHEYINFALE《QUANMIANSHISHIRANMEIDIANCHANGCHAODIPAIFANGHEJIENENGGAIZAOGONGZUOFANGAN》HE《GUANYUSHIXINGRANMEIDIANCHANGCHAODIPAIFANGDIANJIAZHICHIZHENGCEYOUGUANWENTIDETONGZHI》,JIYAOQIUHUODIANCHANGRANMEIGUOLUZAIMODUANZHILIGUOCHENGZHONG,CAIYONGDUOZHONGWURANWUGAOXIAOXIETONGTUOCHUJICHENGXITONGJISHU,SHIQIDAQIWURANWUPAIFANGNONGDUFUHERANQIJIZUPAIFANGXIANZHI,JIFENCHEN、SO2、NOxPAIFANGNONGDU( JIZHUNHANYANGLIANGWEI6%) FENBIEBUCHAOGUO5,35,50mg /m3。

随着DB33 /2147—2018《燃煤电厂大气污染物排放标准》( 超低排放) 的提出,有必要采用全新的“协同治理”技术应对全新的环保形势。对于粉尘来讲,当粉尘排放浓度要求达到≤10mg /m3,甚至≤5mg /m3 时,仅在湿法脱硫前采用高效除尘器的工艺方案是不能满足要求的,需要在脱硫后进一步安装湿式静电除尘器。目前常见的超低除尘技术有低低温静电除尘( 低温省煤器) 、布袋除尘、电袋除尘器等。当前烟气脱硫多采用石灰石-石膏湿法工艺,主流的脱硫改造可采用单塔技术( 包括喷淋空塔、托盘塔、单塔双循环等技术) 和串联塔技术。对于燃用中低硫煤的火电机组,通过优化吸收塔设计,提高吸收塔液气比( 增设喷淋层,提高浆液循环泵流量) 或者采取增强气液传质措施( 增设托盘持液层、湍流层、聚气环等) ,可大幅提高吸收塔的脱硫效率,满足超低排放要求。而串塔改造方案可以通过控制一、二级吸收塔的pH值实现分区控制。一级吸收塔低pH 值运行,利于石膏氧化结晶; 二级吸收塔高pH 值运行,利于高效脱硫。NOx控制采用低氮燃烧技术和烟气脱硝技术相结合的综合防治措施,低氮燃烧技术作为燃煤电厂NOx控制的首选技术,主要有低氮燃烧器、空气分级燃烧技术和燃料分级燃烧技术等,烟气脱硝技术以高效SCR为主。

ZAICHAODIPAIFANGJISHUDESHIJIYINGYONGZHONG,XIANCHANGQINGKUANGFUZA,ZAIGONGYIHEJISHUSHANGBINGMEIYOUTONGYIBIAOZHUN,XUYAOGENJUSHIJIQINGKUANGJINXINGZHENDUIXINGDESHEJI。BENWENJIYUMOURANMEIREDIANCHANG2 ×130 t /hXUNHUANLIUHUACHUANGGUOLUCHAODIPAIFANGGAIZAOGONGCHENG,SUIJIXUANQUQIZAIWANGLIANXUYUNXING30dDEYANQIWURANWUPAIFANGSHUJU( 720GESHIDUAN) ,DUIGAIZAOHOUSO2、NOxHEFENCHENDESHUJUJINXINGXIANGXIFENXI,YANJIUQIPAIFANGTEXING,WEIRANMEIREDIANCHANGCHAODIPAIFANGGAIZAOTIGONGGONGCHENGJIEJUEFANGANHESHUJUZHICHENG。

1 工程概况

GAIREDIANCHANGYUANYOUDEYANQICHULILIUCHENGWEI: SNCRTUOXIAO→JINGDIANCHUCHENQI→SHIHUISHI-SHIGAOYANQITUOLIU。DANYUANYOUJINGDIANCHUCHENQIDENEIJIBAN、JIXIAN、QIAOTIYIJIYANDAOZAIZHANGQIYUNXINGGUOCHENGZHONGJUNYICUNZAIJIAODACHENGDUDEFUSHI,SUOYICAIYONGQUANXINDEBUDAICHUCHENQITIHUANYUANYOUDEJINGDIANCHUCHENQI。YUANYOUSHIHUISHI-SHIGAOYANQITUOLIUZHUANGZHIDESO2PAIFANGSHEJIZHIWEI200mg /m3,YUSO2CHAODIPAIFANGYAOQIUYOUJIAODADECHAJU,XUYAOJINXINGGAIZAO。TUOLIUGAIZAORENGCAIYONGSHIHUISHI-SHIGAOYANQITUOLIUGONGYI,ANZHAOLIANGLU TAPEIZHI,ZAIXIANYOU3CENGPENLINJICHUSHANGZENGJIA1CENGPENLIN,BINGGENGHUANYUANYOU3 CENGPENLINCENGQUANBUPENZUI( SHANGXIASHUANGXIANG) ,TONGSHIJIANGCHUWUQIGENGHUANCHENG1CENGGUANSHI+LIANGJIWUJICHUWUQI,ZUIHOUZAITUOLIUTADINGJIAZHUANGLIGUANSHISHISHIDIANCHUCHENQI。LINGWAI,YUANYOUDESNCRTUOXIAONOxDESHEJIPAIFANGZHIWEI100mg /m3,WUFAMANZUCHAODIPAIFANGYAOQIU。WEICI,TUOXIAOGAIZAOCAIYONG“SNCR YOUHUA+SCR( 1 CENGCUIHUAJI) ”OUHETUOXIAOGONGYI。ZUIZHONGGAIQIYEQUEDINGSHIXIANCHAODIPAIFANGDEJISHUFANGANWEISNCRTUOXIAO+SCRTUOXIAO+BUDAICHUCHEN+SHIHUISHI-SHIGAOSHIFAYANQITUOLIU( LIANGLU1TA) +SHISHIJINGDIANCHUCHENQI( LIANGLU1 TA) ,GONGYILIUCHENGRUTU1SUOSHI。

电厂超低排放工艺流程

2 改造效果

2.1 脱硫效果分析

2.1.1 SO2排放浓度

TUOLIUHOUSO2PAIFANGNONGDUJIAOWEIWENDING( TU2) ,JINYOU21GESHIDUANCHAOGUO35mg /m3 DEPAIFANGBIAOZHUN,ZHANZONGSHIDUANDE2.9%。ERQIESO2PAIFANGNONGDUKONGZHIDEHENDI,30d NEIPINGJUNNONGDUJINWEI6.32mg /m3。RUBIAO1 SUOSHI,SO2PAIFANGNONGDU<10mg /m3 DESHIDUANZHAN81.7%,SHENZHI<5 mg /m3 DESHIDUANYEZHAN65.1%。

SO2排放浓度

JINGFENXIJISUAN,TUOLIUGUOCHENGZHONGGAILIUBIYUEWEI1.07,XIANSHIMEIYOUGUODUODETUOLIUJIJIARU。DANTUOLIUGUOCHENGZHONGYEQIBI>15,QIEMEIYOUGENJURUKOUYANQITIAOJIANJINXINGDIAOJIE,DAOZHISO2CHUKOUNONGDUHENDI。SUIRANCONGHUANBAOZHIBIAOSHANGKAN,DISO2PAIFANGNONGDUYOUZHUYUSO2ZONGLIANGJIANPAI,DANDUITUOLIUXITONGYUNXINGDEJINGJIXINGHEZONGHESHEHUIXIAOYISHIBULIDE。SUOYIXUJIAQIANGTUOLIUGUOCHENGDEZIDONGKONGZHI,SHIXIANGUOCHENGCANSHUDEYOUHUA,JIANGDINENGHAOWUHAO,DADAOGAOXIAOHEJINGJIYUNXING。

2.1.2 脱硫效率

BENTUOLIUXITONGDESHEJIXIAOLVWEI98. 9%,RUTU3 SUOSHI。KEZHI: TUOLIUXIAOLVDUOSHUSHIDUANWEICHIZAI99%YISHANG。CISHI,QIYEDEDIAOKONGKONGJIANHENXIAO,ZHEIDAOZHILEZUIZHONGDESO2PAIFANGNONGDUDOUKONGZHIZAIHENDIDESHUIPING。DANYOUBUFENSHIDUANTUOLIUXIAOLVCHUXIANLEYICHANGDEDIZHI,JINGHECHAGAISHIDUANJINKOUSO2BIAOJICHUXIANGUZHANGERWUFAHUOQUZHUNQUEDEJINKOUSO2NONGDU。YOUYUYANQICHUSHITIAOJIANBODONG,BA98. 9%DETUOLIUXIAOLVZUOWEIKONGZHIZHIBIAODESHIJIYIYIXIAO,ERYINGGAIBAKAOCHADEZHONGDIANFANGZAIRUHEWENDINGSHIXIANSO2DECHAODIPAIFANG,BINGTONGGUOYOUHUAKONGZHICANSHULAISHIXIANJINGJIYUNXING。TONGSHIXUYAOJINYIBUJIAQIANGSO2BIAOJIDEWEIHUHEBAOYANG,YIHUOQUZHUNQUEDEPAIFANGSHUJU。

系统脱硫效率

2.2 脱硝效果分析

2.2.1 NOx排放浓度

RUTU4 HEBIAO2 SUOSHI,NOxPAIFANGNONGDUJIAOWEIWENDING,98.2%DESHIDUANNOxPAIFANGNONGDU< 50mg /m3。ERNOx>100 mg /m3DEQINGKUANGSHIANSHUIBENGCHUXIANWENTI,ANSHUIWUFAZHURUSUOZHI。ZONGTILAIKAN,30%ZUOYOUSHIDUANDENOxPAIFANGNONGDU>30mg /m3,NOxDEPINGJUNNONGDUWEI24. 6mg /m3,SUOYISHENGMEIQIHOUMIANDEYANDAONEIJIAZHUANG1 CENGSCR CUIHUAJIDUIYUGAOXIAOTUOXIAORENGCUNZAIYIDINGDEBUZU,HOUXUYINGZAIZENGJIA1 CENGCUIHUAJI。

NOX排放浓度达标占比

2.2.2 SNCR+SCR 后氨逃逸

SUIRANNOxPAIFANGNONGDUFUHECHAODIPAIFANGYAOQIU,DANANTAOYIKONGZHIBINGBULIXIANG,CHAOBIAOQINGKUANGJIAODUO( JIANTU5、TU6) 。ANTAOYIDEJISHUZHIBIAOWEI2.5mg /m3,1HAOLUANTAOYIDEPINGJUNNONGDUWEI2.78mg /m3,CHAOBIAOBILIDADAO38.3%; 2 HAOLUANTAOYIDEPINGJUNNONGDUWEI4.10 mg /m3,CHAOBIAOBILIDADAO65.6%。GENJUANDANBI( NH3 /NOx) JISUAN,1、2HAOLUDEANDANBIFENBIEDADAO1.99 HE1.87。YINCI,ZAISNCR+SCROUHETUOXIAOGUOCHENGZHONG,RENGXUYANGEKONGZHIANTOUJIALIANG,JINYIBUYOUHUASNCRZHONGPENANLIANG。

1#炉2#炉氨逃逸

2.3 除尘效果分析

2.3.1 湿电出口粉尘浓度

由于布袋除尘后未设置专门的粉尘在线监测系统,所以仅对湿式电除尘后的烟气中的粉尘浓度进行分析。经过布袋除尘、湿法脱硫和湿式电除尘后,粉尘排放浓度整体达标( 图7) 。可知: 大多数时段粉尘排放浓度<2. 5 mg /m3,但仍有2. 5%的时段粉尘排放浓度>5mg /m3的排放标准。根据人工监测分析,布袋除尘效果不佳,可能是导致尾部粉尘超标的重要原因。

湿式静电除尘器出口粉尘浓度

2.3.2 SHISHIJINGDIANCHUCHENQIERCIDIANYADUIFENCHENPAIFANGNONGDUDEYINGXIANG

CONGSHISHIJINGDIANCHUCHENQIDUIFENCHENDETUOCHUXIAOGUOLAIKAN,SUIZHEERCIDIANYADESHENGGAO,FENCHENTUOCHUXIAOGUOYOUYIDINGGAISHAN,DANTIGAOFUDUYOUXIAN。ZAI25kV ERCIDIANYAXIA,FENCHENPAIFANGNONGDUWEI0.4~1.8mg /m3,ERDANGERCIDIANYAZENGJIADAO40kV SHI,FENCHENPAIFANGNONGDUWEI0.2~1.0 mg /m3。

湿式静电除尘二次电压对粉尘排放浓度的影响

3 结论

1) MOURANMEIDIANCHANGYANQICHAODIPAIFANGGAIZAOHOU,YUNXING1GEYUENEISO2PAIFANGNONGDUJINYOU21GESHIDUANCHAOGUO35mg /m3,ZHANZONGSHIDUANDE2.9%。QIESO2PAIFANGNONGDUKONGZHIDEHENDI,PINGJUNNONGDUJINWEI6.32 mg /m3。ZONGTISHANGTUOLIUXIAOLVYIKONGZHIDAOWEI,DANYOUYUYANQICHUSHITIAOJIANBODONGDA,BAGAOTUOLIULVZUOWEIJISHUZHIBIAODESHIJIYIYIXIAO,ERYINGZHONGDIANSHIXIANSO2DEWENDINGCHAODIPAIFANG,BINGTONGGUOYOUHUAKONGZHICANSHULAISHIXIANJINGJIYUNXING。

2) NOxPAIFANGNONGDUWENDING, 98.2%DESHIDUANNOxPAIFANGNONGDU<50mg /m3。SHIFATUOLIUDUINOxMEIYOUXIANZHUTUOCHUXIAOGUO,TUOLIUHOUYANQIZHONGNO2ZAINOxZHONGBILIYOUSUOTIGAO。SNCR+SCR HOUANTAOYIKONGZHIBULIXIANG,CHAOBIAOQINGKUANGJIAODUO,ZAISNCR+SCR OUHETUOXIAOZHONGNH3 /NOxDEKONGZHIXUGENGJIAYANGE。

3) JINGGUOBUDAICHUCHEN、SHIFATUOLIUHESHISHIJINGDIANCHUCHENQIHOU,JUEDADUOSHUSHIDUANFENCHENPAIFANGNONGDUDOUZAI2.5mg /m3 YIXIA,DANSHISHIJINGDIANCHUCHENQIDECHUCHENXIAOGUOBINGBUXIANZHU,HOUQIYANJIUJIANGJIEHESHIJIGONGKUANGJINYIBUYOUHUASHISHIJINGDIANCHUCHENQIYUNXINGCANSHU,SHIXIANQIGAOXIAOHEJINGJIYUNXING。

LAIYUANYU:HUANJINGGONGCHENG  YUANBIAOTI:RANMEIREDIANCHANGYANQICHAODIPAIFANGGAIZAOGONGCHENGSHIJIAN

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