CN106110868A - 一种dc复合塔二氧化硫处理系统 - Google Patents
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Abstract
本发明公开一种DC复合塔二氧化硫处理系统,包括DS多相脱硫塔与CST穿流板塔,所述DS多相脱硫塔顶端通过管道与锅炉连通,所述DS多相脱硫塔下端设在沉淀池上,并与其连通;所述CST穿流板塔下端设在沉淀池上,并与其连通;所述CST穿流板塔顶端通过管道连接引风机,引风机通过管道连通烟囱;所述沉淀池下部设有污水口;所述沉淀池中部通过循环泵接入DS多相脱硫塔上部;所述引风机与烟囱、以及锅炉与DS多相脱硫塔之间的管道上通过循环风管连通。本发明提供的DC复合塔解决了湿法脱硫烟气携带气溶胶颗粒物排放导致的“二次污染”问题;系统减少了各单塔串联使用时的占地面积,节省投资费用,增强系统运行可靠性。
Description
技术领域
本发明属于环保设备技术领域,涉及一种DC复合塔二氧化硫处理系统,具体是一种DS多相脱硫塔和CTS穿流塔板一体化脱硫技术。
背景技术
工业排除的烟气污染物主要成分是SO2和粉尘,对大气环境及人类造成了严重的危害。烟气脱硫除尘一体化技术能再一体化工艺工程中,将脱硫和除尘两个操作单元结合起来,效率高、投资少,推广除尘脱硫一体化技术对改善具名生活环境、提高经济效益与区域的空气质量有着重要的意义。脱硫系统位于烟道的末端、除尘器之后,脱硫过程的反应温度低于露点,所以脱硫后的烟气需要再加热才能排出。随着国家排放标准的提高,脱硫系统的除尘效率也在不断提高,尤其湿法脱硫效果较干法脱硫效果要好的多,所以湿法脱硫成为企业的首选。
灰石-石膏法烟气脱硫技术以石灰石浆液作为脱硫剂,在吸收塔内对烟气进行处理吸收,使烟气中的二氧化硫反应生成亚硫酸钙,同时向吸收塔的浆液中鼓入空气,强制使亚硫酸钙转化为硫酸钙,脱硫剂的副产品为石膏。该系统包括烟气换热系统、吸收塔脱硫系统、脱硫剂浆液制备系统、石膏脱水和废水处理系统。由于石灰石价格便宜,易于运输和保存,因而已成为湿法烟气脱硫工艺中的主要脱硫剂,石灰石-石膏法烟气脱硫技术成为优先选择的湿法烟气脱硫工艺,该法脱硫效率高(大于95%),工作可靠性高。
现有技术中DS多相脱硫塔和CST穿流板塔均属于湿法脱硫,虽然各自具有较高的脱硫效率,但其不足之处如下:DS多相脱硫塔,如图1所示,该脱硫塔虽具有较高的脱硫效率,单由图可以看出,反应液与烟气在接触的过程中不是封闭,会有小部分气体不与反应液接触经除雾器托雾后排出反应塔,影响脱硫塔的脱硫效率;CST穿流板塔,如图2所示,由于上的孔相对较小,所有反应液种类受到限制,与SO2反应产生沉淀的反应液无法用在该反应塔中,容易堵塞筛孔,使反应塔无法运行。
发明内容
本发明的目的在于提供一种DC复合塔二氧化硫处理系统。
本发明的目的可以通过以下技术方案实现:
一种DC复合塔二氧化硫处理系统,包括DS多相脱硫塔与CST穿流板塔,所述DS多相脱硫塔顶端通过管道与锅炉连通,所述DS多相脱硫塔下端设在沉淀池上,并与其连通;
所述CST穿流板塔下端设在沉淀池上,并与其连通;所述CST穿流板塔顶端通过管道连接引风机,引风机通过管道连通烟囱;
所述沉淀池下部设有污水口;所述沉淀池中部通过循环泵接入DS多相脱硫塔上部;
所述引风机与烟囱、以及锅炉与DS多相脱硫塔之间的管道上通过循环风管连通。
本发明的有益效果:本发明提供的DC复合塔解决了湿法脱硫烟气携带气溶胶颗粒物排放导致的“二次污染”问题;系统减少了各单塔串联使用时的占地面积,节省投资费用,增强系统运行可靠性,创造了更大的经济效益,同时兼备了DS多相脱硫塔和CST穿流板塔的优点,也克服了两塔单独使用时的缺点,现有脱硫装置可用率提升,可以满足更高的环保要求,在将来的脱硫系统中拥有着广泛的应用前景。
附图说明
为了便于本领域技术人员理解,下面结合附图对本发明作进一步的说明。
图1为现有技术中DS多相脱硫塔结构示意图;
图2为现有技术中CST穿流板塔结构示意图;
图3为本发明一种DC复合塔二氧化硫处理系统结构示意图。
具体实施方式
一种DC复合塔二氧化硫处理系统,如图3所示,包括DS多相脱硫塔2与CST穿流板塔3;DS多相脱硫塔2顶端通过管道与锅炉1连通,DS多相脱硫塔2下端设在沉淀池7上,并与其连通;
CST穿流板塔3下端设在沉淀池7上,并与其连通;CST穿流板塔3顶端通过管道连接引风机5,引风机5通过管道连通烟囱4;
沉淀池7下部设有污水口8;沉淀池7中部通过循环泵9接入DS多相脱硫塔2上部;
在引风机5与烟囱4、以及锅炉1与DS多相脱硫塔2之间的管道上通过循环风管6连通;
DS多相脱硫塔工作原理:该塔分为三部分:上部为烟气进口,配有循环吸收浆液的进口管,中部为反应单元,在此主要进行气-液反应。烟气通过反应单元与浆液充分接触,脱除SO2;下部为氧化浆液槽。气体和液体在此进行浆液分离,吸收浆液在氧化槽内进行充分氧化,生成石膏。吸收浆液通过循环泵输送到塔顶浆液分布器,形成一道水幕,气、液两相在塔内构件导流作用下在塔内形成高度湍流区,气流充分接触,脱硫效率高,每个吸收塔由多个吸收单元组成。
CST穿流板塔工作原理:该塔含尘废气在引风机的作用下顺气流进入CST穿流板塔-湿式泡沫除尘器,气体压降△P,液体压降△L;当气体压降△P=液体压降△L时,在筛板上留有一层水膜,随着引风机作用当气体压降△P>液体压降△L时,气体冲破水膜进入下一层筛板;在水泵的作用下当液体压降△L>气体压降△P,液体通过筛孔流到下一层筛板上,气体与液体在筛板上不断交替变化。液膜和气体互相作用变为无数个小的泡沫,含尘气体中的粉尘就被这无数的泡沫收捕,留在液体中,每塔有2-3块筛板,每块筛板上的泡沫层厚度有150mm,含尘废气在塔中泡沫层经400-600mm路径,烟尘被留了下来顺水流出塔外,被净化的气体在塔内经液固分离除雾后随引风机排入大气。
本发明提供的DC复合反应塔是将DS多相脱硫塔2与CST穿流板塔3结合用于一套的脱硫系统,工作原理如下:
锅炉1烟气引出后进入DS多相脱硫塔2进行脱硫,经DS多相脱硫塔2后,烟气中SO2大部分被Ca(OH)2溶液吸收,在沉淀池7中沉淀排出,经过处理后的含有少量的SO2的烟气进入CST穿流板塔3进行再处理,CST穿流板塔3内设置一层筛板和一层除雾器,CST穿流板塔3上部引入清水作为反应液,烟气在经过CST穿流板塔3内的筛板时,烟气内的少量SO2和烟尘被水溶液拦截下来流入沉淀池7内再反应生成沉淀排除塔外;通过筛板后的烟气含有少量液滴,经除雾器后被脱除,洁净的的烟气经烟道由烟囱排出;
采用DC复合塔有效的将DS多相脱硫塔2处理后烟气中无法去除的少量SO2气体去除,很大程度少提高了SO2的脱硫效率,降低了环境污染,减少了给人类健康带来的危害,同时克服了CST穿流板塔3单塔使用时反应液选择受到限制的现状,CST穿流板塔3塔内的反应液直接进入DS多相脱硫塔2的沉淀池7与Ca(OH)2溶液反应,无需另建系统将硫从水溶液中结晶排除,节省了系统的占地面积,降低了经济费用。
以上内容仅仅是对本发明结构所作的举例和说明,所属本技术领域的技术人员对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代,只要不偏离发明的结构或者超越本权利要求书所定义的范围,均应属于本发明的保护范围。
Claims (1)
1.一种DC复合塔二氧化硫处理系统,包括DS多相脱硫塔(2)与CST穿流板塔(3),其特征在于,所述DS多相脱硫塔(2)顶端通过管道与锅炉(1)连通,所述DS多相脱硫塔(2)下端设在沉淀池(7)上,并与其连通;
所述CST穿流板塔(3)下端设在沉淀池(7)上,并与其连通;所述CST穿流板塔(3)顶端通过管道连接引风机(5),引风机(5)通过管道连通烟囱(4);
所述沉淀池(7)下部设有污水口(8);所述沉淀池(7)中部通过循环泵(9)接入DS多相脱硫塔(2)上部;
所述引风机(5)与烟囱(4)、以及锅炉(1)与DS多相脱硫塔(2)之间的管道上通过循环风管(6)连通。
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