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烟气脱白技术   众鑫棋牌 > 烟气脱白技术

石灰石--石膏湿法烟气脱硫工艺流程

[2019-1-24] 点击:

湿电咨询服务: 陶经理18332815001 张经理18633235200

1、石灰石/石膏湿法脱硫工艺过程简介

SHIHUISHI/SHIGAOSHIFATUOLIUGONGYISHIYISHIHUISHIRONGJIEHOUZHICHENGDEJIANXINGRONGYEZUOWEIXISHOUJIDUIYANQIZHONGHANYOUDESUANXINGQITIWURANWU(ZHUYAOSHIERYANGHUALIU)JINXINGXISHOUCHULIDEYIZHONGGONGYI。SHIFATUOLIUGONGYIDEZHUYAOGUOCHENGKEFENWEIYIXIAJIGEBUFEN:

(1)HUNHEHEJIARUXINXIANDEXISHOUYE;

(2)XISHOUYANQIZHONGDEERYANGHUALIUBINGFANYINGSHENGCHENGYALIUSUANGAI;

(3)YANGHUAYALIUSUANGAISHENGCHENGSHIGAO;

(4)CONGXISHOUYEZHONGFENLISHIGAO。

2 、吸收塔系统在湿法脱硫工艺中的重要地位

XISHOUTAXITONGSHISHIHUISHI/SHIGAOSHIFATUOLIUGONGYIDEHEXINBUFEN,ZAISHIFATUOLIUGONGYIDESIGEBUFENZHONG,(1)~(3)SANGEBUFENSHIZAIXISHOUTAXITONGZHONGSHIXIANDE,JIZAIXISHOUTAXITONGZHONGWANCHENGLEDUIYANQIZHONGERYANGHUALIUJINXINGXISHOU、YANGHUAHEJIEJINGDEZHENGGEFANYINGGUOCHENG。

2.1吸收塔系统的构成

XISHOUTAXITONGZHUYAOYOURUXIAJIGEZIXITONGGOUCHENG:XISHOUTABENTIXITONG、SHIHUISHIJIANGYEGONGYINGXITONG、YANGHUAKONGQIGONGYINGXITONG、SHIGAOJIANGYEPAICHUXITONG。CIWAI,SHIGAOYIJITUOSHUIXITONGJIPAIKONGXITONGDENGYEYUXISHOUTAXITONGDEYUNXINGMIQIEXIANGGUAN。

石灰石--石膏湿法烟气脱硫工艺流程

2.2 吸收塔系统的工作原理

2.2.1 吸收塔本体吸收系统:在吸收塔的喷淋区,石灰石、副产物和水等混合物形成的吸收液经循环浆液泵打至喷淋层,在喷嘴处雾化成细小的液滴,自上而下地落下,而含有二氧化硫的烟气则逆流而上,气液接触过程中,发生如下反应:

CaCO3+2 SO2+H2O  <=>  Ca(HSO3)2+CO2

CHUSO2WAI,YANQIZHONGSANYANGHUALIU、LVHUAQINGHEFUHUAQINGDENGSUANXINGZUFENYEYIHENGAODEXIAOLVCONGYANQIZHONGQUCHU。JIANGYEZHONGDESHUIJIANGYANQILENGQUEZHIJUEREBAOHEWENDU,XIAOHAODESHUILIANGYOUGONGYISHUIBUCHANG。WEIYOUHUAXISHOUTADESHUILIYONG,ZHEIBUFENBUCHONGSHUIBEIYONGLAIQINGXIXISHOUTADINGBUDECHUWUQI。

2.2.2氧化空气供应系统

ZAIXISHOUTADEJIANGCHIQU,TONGGUOGURUKONGQI,SHIYALIUSUANQINGGAIZAIXISHOUTAYANGHUASHENGCHENGSHIGAO,FANYINGRUXIA:

Ca(HSO3)2+O2+ CaCO3+3 H2O 2CaSO4.2H2O+CO2

JIANGCHIZHONGGUOBAOHEDESHIGAOYIJIEJINGDEXINGSHIXICHU,HANYOUSHIGAODEJIANGYETONGGUOXUNHUANBENGJIXUSONGRUPENLINCENGYUYANQIFANYING,SHIJIARUDEXISHOUJIBEICHONGFENLIYONG,TONGSHISHIXISHOUTAJIANGCHIZHONGJIANGYEYOUZUGOUDETINGLIUSHIJIANXINGCHENGYOULIANGDESHIGAOJINGTI,SHIGAOJINGTIZENGZHANGLIANGHAOSHIBAOZHENGCHANPINSHIGAOZHILIANGDEQIANTI。

2.2.3 石膏排出及一级脱水系统

CONGXISHOUTAZHONGCHOUCHUDEJIANGYEJIANGBEISONGZHISHIGAOXUANLIUQI。YIDINGLIANGDESHIGAOJIANGYEZEBEILIANXUDICONGJIANGCHIZHONGCHOUCHU,BINGSONGRUSHIGAOXUANLIUQIJINXINGYIJITUOSHUICHULI,TONGGUOXUANLIUQIYILIUFENLICHUJIANGYEZHONGJIAOXIDEGUTIKELI(XISHIGAOKELI,WEIRONGJIEDESHIHUISHIHEFEIHUIDENG),HANYOUZHEIXIEXIXIAOGUTIKELIDEJIANGYEDABUFENFANHUIXISHOUTAJIXUJINXINGXISHOU、YANGHUAHEJIEJINGFANYING,SHAOBUFENZEZUOWEITUOLIUFEISHUIPAIFANG,YIFANGZHINEIXIEBUXUYAODEZAZHI,RULVHUAWUHEYIXIEBURONGXINGZUFENRUYANGHUATIE、YANGHUALVHEGUISUANYANDENGZAIXISHOUTAZHONGDEJILEINONGDUGUOGAO;NONGSUODESHIGAOJIANGYE(NONGDUWEI50%)ZHUYAOHANYOUCUSHIGAOKELI,CONGSHIGAOXUANLIUQIDEDILIUKOUPAICHU,SONGRUZHENKONGPIDAIJIERJITUOSHUIDANYUANJINYIBUCHULI,CHANSHENGHANSHUILVXIAOYU10%(ZHONGLIANGBI)DECHENGPINSHIGAOZUOWEIFUCHANPINZUIZHONGPAICHU。

2.2.4 石灰石浆液供应子系统:新鲜的吸收剂是由磨细的石灰石(CaCO3)加适量的水溶解配制成石灰石浆液,再根据pH值和SO2负荷加入吸收塔。

3、 吸收塔系统的启停程序

QIDONG:JINGZHONGZHUNBEI XISHOUTAJIAOBANQI XUNHUANBENGYICIQIDONG  CHUWUQICHONGXI SHIGAOPAICHUBENG SHIHUISHIGONGJIANG YANGHUAFENGJI ZIDONGDIAOJIEXITONGTOURU

GUANBI:ZIDONGDIAOJIEXITONGTUICHU  YANGHUAFENGJIGUANBI  SHIHUISHIGONGJIANGTINGZHI  CHUWUQICHONGXITINGZHI SHIGAOPAICHUBENGTINGZHIXUNHUANBENGYICITINGZHI

4、 吸收塔系统主要运行参数的控制

YAOSHIXIANXISHOUTAXITONGDEWENDINGYUNXING,XUYAODUIXISHOUTAXITONGDEZHUYAOYUNXINGCANSHUJINXINGYOUXIAODIJIANCEHEKONGZHI。XISHOUTAXITONGDEYUNXINGKONGZHIZHUYAOSHIDIAOJIESHUI、WULIAOHEHUAXUEFANYINGDENGDEPINGHENG,ZAISHIJIYUNXINGZHONGFANGSHITONGGUOXISHOUTAYEWEIKONGZHI、SHIHUISHIGONGJIANGLIULIANGKONGZHI、SHIGAOPAICHULIANGKONGZHIDENGDIAOJIEXITONGLAISHIXIANDE。

4.1 吸收塔液位控制

FGDXITONGDESHUIPINGHENGDEDIAOJIESHIFGDXITONGWENDINGYUNXINGDEYIGEZHONGYAOFANGMIAN,XISHOUTACHUYUSHUIPINGHENGDIAOJIEDEHEXIN,ZAILIURUHELIUCHUXISHOUTADESHUILIANGZHIJIANXUYAOBAOCHIYIGEPINGHENG,JIXISHOUTADEYEWEIXUYAOWEICHIWENDING,ZHEIZHUYAOSHITONGGUODIAOJIECHUWUQICHONGXISHUILAISHIXIANDE。LINGYIFANGMIAN,CHUWUQICHONGXISHUITONGSHIHAICHENGDANZHECHONGXICHUWUQIDERENWU,YINCIBIXUBAOZHENGYOUZUGOUDECHONGXISHUILIANG,ZHEIJIUYAOQIUJINLIANGJIANSHAOLIURUXISHOUTADESHUILIANGHUOZENGJIALIUCHUXISHOUTADESHUILIANG。LIUCHUXISHOUTADESHUILIANGZAISHEJITIAOJIANYIDINGDEQINGKUANGXIA,JIBENSHIBUNENGGAIBIANDE;LIURUXISHOUTADESHUILIANG,ZAIYUNXINGZHONGKEKONGZHIDECHENGFENXIANGDUIDUOYIXIE,RUKONGZHIGELEIBENGDEZHOUFENGSHUISHUILIANG、ZUIDAXIANDUDILIYONGSHIGAOGUOLVSHUIJINXINGSHIHUISHIJIANGYEZHIBEI、FANGZHIXITONGWAISHUIRUYUSHUI、QINGJIEYONGSHUIDELIURUDENG。

4.2 石灰石供浆流量控制

SHIHUISHIJIANGYELIULIANGDEDIAOJIESHIFGDXITONGZUIZHONGYAODEYIGEWULIAOPINGHENGDIAOJIE,TASHIGENJUHUAXUEFANYINGDEMOERBILIGUANXIJINXINGJISUANDE,KAOLVDEZHUYAOBIANLIANGYOU:(1)ERYANGHUALIUFUHE (2)pHZHI (3)SHIHUISHIJIANGYENONGDU (4)GAILIUBIDENG

TONGGUODUISHANGSHUBIANLIANGDEJISUAN,DECHUXUYAOTOUJIADESHIHUISHIJIANGYELIANG,CAIQUZAIXIANSHISHIKONGZHIDEFANGSHI,BAOZHENGXITONGDEHUAXUEFANYINGPINGHENG。

ZAISHANGSHUCANSHUZHONG,GUANJIANDEKONGZHICANSHUSHIpHZHI,pHZHIDIAOJIEDEHAOHUAIZHIJIEJUEDINGZHEFGDZHUANGZHIDEYUNXINGSHIFOUZHENGCHANG,XISHOUTAZHONGJIANGYEDEpHZHIYUNXINGFANWEIZAI5.0~5.8ZHIJIAN。ZAISHIHUISHIPINZHIYIDINGDEQINGKUANG,SUIpHZHIDEZENGJIA,TUOLIUXIAOLVJIANGYOUSUOZENGJIA;FANZHI,SUIpHZHIDEJIANGDI,TUOLIUXIAOLVJIANGYOUSUOJIANGDI。TONGSHI,WEIFANGZHISHEBEIBAOLUYUYANZHONGFUSHITIAOJIANXIA,JINZHIXITONGZAIGUODIpHZHIXIAYUNXING。

GAILIUBI(MOERBI)YESHIYINGXIANGTUOLIUXIAOLVDEYIGEZHONGYAOYINSU,ZHENGCHANGQINGKUANGXIA,GAILIUBISHIYIGEDAYU1DESHUZHI。ZAISHIHUISHIPINZHIYIDINGDEQINGKUANGXIA,GAILIUBIYUEGAO,TUOLIUXIAOLVYEYUEGAO;FANZHI,GAILIUBIYUEDI,TUOLIUXIAOLVYEYUEDI。ZAISHIJIYUNXINGZHONG,KAOLVDAOYUNXINGCHENGBEN,TONGCHANGXUANZEYIGEBIJIAOJINGJIKEXINGDEGAILIUBI。

4.3 石膏排出量控制

石膏排出量在一定程度上决定着石膏的品质。石膏晶体只有在长到合适的大小后,才能排出并进一步分离和脱水,从而达到小于10%的含水率(质量百分比)。在实际生产运行中,石膏的排出通常选择间歇性排出方式,即当吸收塔浆液密度增大到一定值时,启动脱水设备并排出石膏;当吸收塔中浆液密度下降到一定值时,停止排出石膏和脱水,等待密度逐渐增大,如此反复操作,实现系统的连续稳定运行。

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