CN103702946B - 酸性海水处理方法及设备 - Google Patents
酸性海水处理方法及设备 Download PDFInfo
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Abstract
一种酸性海水处理方法及设备,其首先将酸性海水与碱性海水混合,再将混合后的中和海水送入曝气容器进行曝气处理,所采用的曝气容器的容积R与需要处理的中和海水的量L满足计量关系:R=(0.008-0.3)L,曝气容器中鼓入的空气量Q与R、L满足计量关系:Q=(25-85)L/R;上述方法及设备可用于对洗涤过内燃机尾气的酸性海水进行处理,尤其适用于但不限于船舶、钻井、浮动工厂等海上平台。
Description
技术领域
本发明涉及一种酸性海水处理方法,特别涉及对于洗涤过内燃机尾气的酸性海水进行处理的方法。本发明还涉及一种酸性海水处理设备。本发明的方法和设备特别适用于但不限于船舶、钻井、浮动工厂等海上平台。
背景技术
近20年来,净化工业设施排放的以SO2为主的气态污染物的国际立法逐步严格和完善,近几年的限制对象已从陆基工业设施发展到海基船舶。限制船舶等内燃机硫氧化物排放的国际立法从2005年开始实施。
以天然海水洗涤实现矿物燃料硫氧化物净化的工艺技术,在陆基燃煤电厂的应用已很成熟。对于海水法烟气脱硫技术在船舶上的应用,其中一个有代表性的解决方案是申请号为PCT/CN2008/071304的国际申请(该文献在此并入全文)。该发明所采用的技术方案是:使内燃机尾气与从上往下流动的海水在填料洗涤层实现逆流洗涤,从而实现吸收SO2的目的,这有效解决了以上问题。
利用申请号为PCT/CN2008/071304的国际申请所提供的方案对内燃机尾气进行处理后,用于洗涤的海水会吸收大量的SO2而形成酸性海水,其pH值可达到3左右。如此酸性的海水是不允许直接排放到海洋中的。为了降低对环境的影响,至少必需使排放海水的pH值上升至接近海水(一般要求是在pH6.5之上)。
对于陆基燃煤电厂,吸收了SO2的酸性海水的处理已经有了相关的方案。然而,该类方案不能直接用于船舶等海上平台,其主要原因是船舶等海上平台的有限的空间不允许设置大尺寸的曝气池。
针对以上所述的现有技术中的有关问题,本发明致力于提供一种适用于船舶等海上平台的酸性海水处理方案。
发明内容
本发明的第一个目的是提供一种酸性海水处理方法,用于对吸收过SO2或是洗涤过内燃机尾气的海水进行处理以消除酸性,再以环境友好的方式排入海洋中。
本发明所提供的酸性海水处理方法基于如下原理:
海水对二氧化硫有良好的吸收性,洗涤并溶入了二氧化硫的海水呈酸性,需要进行处理以提升其pH后才能排放到自然海域。为此,先向洗涤工序排出的pH值很低的酸性海水中加入碱性海水,使其pH值预提升至≥5.5,然后鼓入空气。加入碱性海水提升pH值的过程,是利用碱性海水的碱度来中和酸性海水,使溶入的二氧化硫即游离态的亚硫酸被中和成亚硫酸盐,这时被处理海水的pH值升至≥5.5;此后,要使海水的pH值继续上升到允许排放的数值(一般为≥6.5),还需要继续加入大量碱性海水,从而增加提升和输送海水的能耗;这里,采取向海水中鼓入空气的方法,也可以使海水的pH值继续上升到允许排放的数值。被处理海水的pH值低于5.5时鼓入空气会导致SO2逸出,pH值过高时鼓入空气会降低处理效率,因此,在被处理海水的pH值被调整为≥5.5后鼓入空气。鼓入空气即曝气工序,是向流动的被处理海水连续鼓入空气的过程,其效果取决于鼓入空气的流量、被处理海水的流量及曝气容器的容积。在上述三项因素中,被处理海水的流量与发动机的排量和燃油的硫含量有关,鼓入空气的流量与被处理海水的流量及曝气容器的容积有关,而曝气容器的容积则一方面与鼓入空气的流量及被处理海水的流量有关,同时也受制于应用场所的空间。在陆基燃煤电厂应用的条件下,应用场所的空间不构成制约因素;现有技术需要的工艺空间往往很大,不能直接应用于海上平台等致密空间。为克服现有技术不足,本发明提出减少海水洗涤工艺装置占用空间的方法:对流动的被处理海水连续鼓入空气,曝气容器的容积、被处理海水量及鼓入空气量满足下式(I)和(Ⅱ)的条件:
R=(0.008~0.3)L…(I)
Q=(25~85)L/R…(Ⅱ)
式中R为曝气容器容积(m3),L为每小时需要处理海水的量(m3),Q为每小时鼓入空气以标准状态(0℃,1个大气压)计算的量(Nm3),这样便可将酸性洗涤水处理成接近中性后排入海洋。
因此,本发明所提供的酸性海水处理方法包括:
1)将所述酸性海水与碱性海水混合得到中和海水;
2)使所述中和海水在曝气容器中连续流动,并连续鼓入空气,其中,所述曝气容器的容积R、需要处理的所述中和海水的量L及鼓入空气量Q满足下式(I)和(Ⅱ)的条件:
R=(0.008~0.3)L…(I)
Q=(25~85)L/R…(Ⅱ)
式中R为所述曝气容器的容积,单位为m3;L为每小时处理的所述中和海水的量,单位为m3;Q为每小时鼓入空气的量,单位为Nm3,以标准状态,即0℃、1个大气压计算。
此处所说的酸性海水可以是吸收了SO2的海水,例如洗涤了内燃机尾气的海水,如船舶内燃机。此处所说的碱性海水指的是pH值大于7的海水,由于天然海水通常呈碱性,所以,在一个优选的具体实施方式中,碱性海水是取自海洋的天然海水,也就是新鲜海水。
此处所说的曝气容器即用于容纳海水和进行曝气的容器。该容器可以为适合海水与空气反应的任何形状。
在一个优选的具体实施方式中,将所述酸性海水与碱性海水混合使其中和后海水的pH值为5.5~6.4。
作为一个优选的方案,酸性海水被处理后pH值上升到6.5~7,即中和海水从曝气容器排出时的pH值为6.5~7,这样可以达到排放到海洋中的要求。
本发明的另一个目的是提供一种酸性海水处理设备,用于对吸收过SO2或是洗涤过内燃机尾气的海水进行处理以消除酸性,再以环境友好的方式排入海洋中。
本发明所提供的酸性海水处理设备包括:
用于所述酸性海水与空气进行反应的曝气容器以及用于向所述曝气容器内曝气的曝气装置;
所述曝气容器的容积按下式(I)配置:
R=(0.008~0.3)L…(I);
式中R为所述曝气容器的容积,单位为m3;L为每小时需要处理的海水的量,单位为m3。
另外,还可以对曝气装置进行配置,使之具有一个所期望的曝气量。因此,在一个优选的具体实施方式种,作为一个优选的方案,所述曝气装置被配置成具有曝气量Q,Q按下式(Ⅱ)计算:
Q=(25~85)L/R…(Ⅱ)
式中Q为每小时需要鼓入空气的量,单位为Nm3,以标准状态,即0℃、1个大气压计算。
利用本发明所提供的酸性海水处理方法及设备,可大幅缩小处理洗涤脱硫海水占用的空间并节省用水,在船舶等海上平台应用,可以满足最终排放的洗涤脱硫海水pH值≥6.5的环保要求,使海水洗涤脱硫这一公认的绿色减排工艺,继陆基燃煤电厂成功应用之后,在船舶等海上平台致密空间的应用成为现实。
附图说明
图1是本发明第一种具体实施方式的酸性海水处理设备的示意图。
图2是本发明第二种具体实施方式的酸性海水处理设备的示意图。
具体实施方式
图1示出了本发明第一种具体实施方式的酸性海水处理设备。如图1所示,该具体实施方式中的酸性海水处理设备包括曝气容器1、曝气装置、第一管道31、第二管道32、第三管道33。
其中,曝气容器1用于海水与空气进行反应。曝气容器1设置有排气管11,用于排出反应后生成的气体。
第一管道31用于将酸性海水输送至曝气容器1;第二管道32用于将碱性海水输送至第一管道31,在第一管道31中酸性海水与碱性海水进行混合;第三管道33用于排出反应后的海水。
曝气装置用于向所述曝气容器内曝气,包括曝气头21、鼓风机22、曝气管23。曝气头21为多个,均匀分布于曝气容器1的底部。
对该具体实施方式的酸性海水处理设备进行相关参数的测试。需要处理的海水由洗涤过船舶内燃机尾气的酸性洗涤水,pH为3左右,混合碱性海水后组成中和海水,碱性海水采用天然海水;碱性海水的供应量根据中和海水的pH值是否达到5.5~6.0来调节,低于5.5加大供应量,高于6.0减小供应量,最终进入曝气容器的中和海水量控制为760m3/h左右;曝气容器按中和海水每小时需要处理的量的0.008倍配置,约为6m3;经测试,将曝气装置的曝气量控制为[(25~85)/0.008]m3/每小时,可实现中和海水排出后的pH值为6.5~7;如果将曝气容器按中和海水每小时需要处理的量的0.3倍配置,即230m3左右,经测试,将曝气装置的曝气量控制为[(25~85)/0.3]m3/每小时,可实现中和海水排出后的pH值为6.5~7。为了更好地协调曝气容器的容积和曝气量的设置,可以优选地设置R=(0.05~0.2)L。
图2示出了本发明第二种具体实施方式的酸性海水处理设备。与第一种具体实施方式的酸性海水处理设备所不同的是,第二管道32直接将碱性海水输送至曝气容器1,在曝气容器1中酸性海水与碱性海水进行中和然后曝气。
Claims (15)
1.一种酸性海水处理方法,其特征在于,所述方法包括:
1)将所述酸性海水与碱性海水混合得到中和海水;
2)使所述中和海水在曝气容器中连续流动,并连续鼓入空气,其中,所述曝气容器的容积R、需要处理的所述中和海水的量L及鼓入空气量Q满足下式(I)和(Ⅱ)的条件:
R=(0.008~0.3)L…(I)
Q=(25~85)L/R…(Ⅱ)
式中R为所述曝气容器的容积,单位为m3;L为每小时处理的所述中和海水的量,单位为m3;Q为每小时鼓入空气的量,单位为Nm3,以标准状态,即0℃、1个大气压计算;
其中,所述酸性海水为洗涤了内燃机尾气的海水。
2.如权利要求1所述的酸性海水处理方法,其中,R=(0.05~0.2)L。
3.如权利要求1所述的酸性海水处理方法,其中,所述酸性海水为吸收了SO2的海水。
4.如权利要求1所述的酸性海水处理方法,其中,所述内燃机为船舶内燃机。
5.如权利要求1所述的酸性海水处理方法,其中,所述碱性海水为pH值大于7的海水。
6.如权利要求1所述的酸性海水处理方法,其中,所述碱性海水为取自海洋的天然新鲜海水。
7.如权利要求1所述的酸性海水处理方法,其中,所述中和海水的pH值为5.5~6.4。
8.如权利要求1所述的酸性海水处理方法,其中,所述酸性海水与所述碱性海水在进入所述曝气容器前和/或进入所述曝气容器后进行混合。
9.如权利要求1所述的酸性海水处理方法,其中,所述曝气容器与用于输送所述酸性海水的第一管道连通,所述碱性海水通过第二管道输送至所述第一管道,并在所述第一管道中与所述酸性海水混合。
10.如权利要求1所述的酸性海水处理方法,其中,所述曝气容器分别与用于输送所述酸性海水的第一管道和用于输送所述碱性海水的第二管道连通,所述酸性海水与所述碱性海水在所述曝气容器中混合。
11.如权利要求1所述的酸性海水处理方法,其中,所述中和海水从所述曝气容器排出后的pH值为6.5~7。
12.一种酸性海水处理设备,其特征在于,所述设备包括:
用于所述酸性海水与空气进行反应的曝气容器以及用于向所述曝气容器内曝气的曝气装置;
所述曝气容器的容积按下式(I)配置:
R=(0.008~0.3)L…(I);
式中R为所述曝气容器的容积,单位为m3;L为每小时需要处理海水的量,单位为m3;
所述曝气装置被配置成具有曝气量Q,Q按下式(Ⅱ)计算:
Q=(25~85)L/R…(Ⅱ)
式中Q为每小时需要鼓入空气的量,单位为Nm3,以标准状态,即0℃、1个大气压计算;
其中,所述酸性海水为洗涤了内燃机尾气的海水。
13.如权利要求12所述的酸性海水处理设备,其中,R=(0.05~0.2)L。
14.如权利要求12所述的酸性海水处理设备,其中,所述曝气容器与用于输送所述酸性海水的第一管道连通,所述第一管道与用于输送碱性海水的第二管道连通。
15.如权利要求12所述的酸性海水处理设备,其中,所述曝气容器分别与用于输送所述酸性海水的第一管道和用于输送碱性海水的第二管道连通。
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JP6007245B2 (ja) | 2016-10-12 |
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