CN114014480A - 一种盐酸酸洗废水浓缩结晶分离零排放设备 - Google Patents
一种盐酸酸洗废水浓缩结晶分离零排放设备 Download PDFInfo
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Abstract
本发明公开了一种用于盐酸酸洗废水浓缩结晶分离零排放设备,包括废水过滤、原水蒸汽制备、废水加热、机架、蒸发浓缩、沉淀池、结晶分离、两级气体吸收、循环水冷却以及电控箱,通过对废水强制放射扩散形成液态膜面气化蒸发,使盐酸废水铁盐溶解度降低,在结晶釜冷却结晶析出氯化铁,蒸发出的酸性气体被吸收液吸收后返回到酸洗线,逃逸的酸性气体与活性铁反应生成氯化铁盐返回到废水过滤端,上述盐酸废水浓缩结晶分离零排放设备能够使盐酸废水在低温下蒸发,氯化氢气体被水吸收回用,氯化铁结晶出售,盐酸酸洗废水处理零排放。
Description
技术领域
本发明涉及一种盐酸酸洗废水分离处理技术领域,特别涉及一种用于对含有盐酸酸洗废水进行浓缩结晶分离,分离出来的氯化氢气体被水吸收提浓回用,浓缩结晶出来的氯化铁晶体出售,盐酸酸洗废水处理过程零排放的设备。
背景技术
蒸发结晶技术广泛用于海水淡化、化工废水处理、化工生产、制盐、金属采矿等行业,在钢铁工件表面酸洗过程中产生的盐酸酸洗废水其处理过程大多采用闭式环境下的负压蒸发结晶技术,废水沸腾蒸发温度为75℃~95℃,虽然比常压蒸发温度低但耗能仍较严重,且真空设备较复杂,设备体积较为高大,往往在生产车间外面布置,操作和保养皆不便,另外对于盐酸酸洗废水负压蒸发结晶产生的稀盐酸用于与浓度36%的市售浓盐酸混配后,尚有剩余稀盐酸无法处理,生产单位甚感不便,实际上生产单位用此工艺设备在生产中使用较少,没有盐酸酸洗废液处理设备的厂家往往将其委托给有资质的危废企业将其运走,这样造成了一定的生产安全隐患。
发明内容
本发明旨在克服现有技术中的上述不足,提供一种气化分离蒸发充分、耗能少、废水浓缩倍数大、氯化铁结晶效果好、一级吸收塔内稀盐酸全部回用、二级吸收塔内氯化铁溶液全部回用再蒸发处理,且结构简单、操作和保养方便、零排放的盐酸酸洗废水浓缩结晶分离设备。
为达此目的,本发明采用以下技术方案:
一种盐酸酸洗废水浓缩结晶分离零排放设备,包括盐酸废水过滤装置、原水蒸汽制备装置、废水加热器、蒸发器、沉淀池、结晶分离装置、机架、两级气体吸收塔、冷却塔以及电控箱,所述盐酸废水过滤装置包括废水调节池、袋式过滤器和废水箱,且废水箱安装液位计,废水通过管道连接水泵对废水进行过滤,所述原水蒸汽制备装置包括软化器、软化水箱、疏水阀和蒸汽锅炉,且软化水箱内安装液位计,所述废水加热器为蒸汽加热,用于加热盐酸废水,所述结晶分离装置包括结晶釜和离心机,所述蒸发器、结晶釜和离心机安装在机架上,沉淀池在机架下方,沉淀池内安装有沉淀斜板、中隔板和上升导流板,且装有温控仪和液位计,所述蒸发器、沉淀池底部开有回流孔,沉淀池、提升泵、加热器、蒸发器通过管道连接作为废水加热蒸发循环回流管路,沉淀池、提升泵、结晶釜、离心机通过管道连接作为浓缩液结晶循环回流管路,所述冷却塔与结晶釜、气体吸收塔通过管道相连,所述蒸发器顶部进风口装有空气过滤器,出风口装有引风机,引风机通过风管与一级气体吸收塔相连,所述二级气体吸收塔通过气管与一级吸收塔相连,所述二级吸收塔顶部侧面上方装有活性铁投料机。
特别地,所述废水过滤泵、液位计、废水提升泵、温控仪、蒸发提升泵、软化器、蒸汽锅炉、引风机、结晶釜、离心机、冷却塔、循环泵、二级气体吸收塔、活性铁投加机、均通过电控箱电连接。
特别地,所述加热器为蒸汽加热石墨加热器。
特别地,所述蒸发器分离端和除雾端下部为水平夹角60°的漏斗,漏斗底部装有竖直管通入沉淀箱。
特别地,所述蒸发器分离端装有挥发分离材料和废水喷头,在蒸发器除雾端装有塑料丝网除沫器、蜂窝除雾器、板式除雾器的任一种。
特别地,所述一级气体吸收塔液槽内装有冷却盘管,并在两级吸收塔内装有喷淋头和填料,塔外吸收液循环泵和管道。
本发明具有以下积极效果:
1)盐酸酸洗废水浓缩结晶分离过程中,由于分离设备是开式气化蒸发,蒸发器内是微负压状态,废水蒸发温度在50℃~55℃,与负压闭式蒸发相比,能耗明显降低;
2)盐酸酸洗废水浓缩结晶分离过程中,不添加任何化学药品,如中和剂氢氧化钠,故没有高含盐废水的排放;
3)盐酸酸洗废水浓缩结晶分离过程中,从蒸发器蒸发出的气体经两级吸收塔吸收,一级吸收塔内的盐酸溶液可直接回用于生产线,二级吸收塔内的氯化铁溶液返回到废水过滤装置,再次进行蒸发分离出氯化铁结晶,做到了变废为宝;
4)设备可装在酸洗生产线附近,占地面积小、无需建专用工房及土建设施,可降低投资、投产运行快、经济效益好;
附图说明:
下图根据附图和实施例对本发明作进一步详细说明。
图1为本发明盐酸酸洗废水浓缩结晶分离零排放设备结构示意图。图中:1、废水管;2、调节池;3、废水过滤泵;4、袋式过滤器;5、液位计;6、废水箱;7、废水提升泵;8蒸发提升泵;9、温控仪;10、废水加热器;11、疏水阀;12、软化水箱;13、液位计;14、软化器;15、原水管道;16、软水提升泵;17、蒸汽锅炉;18、空气过滤器;19、蒸发器;20、机架Ⅰ;21、结晶釜;22、机架Ⅱ;23、离心机;24、冷却塔;25、循环泵;26、一级吸收塔;27、二级吸收塔;28、活性铁投料机;29、引风机;30、浓缩液提升泵;31、沉淀池;32、结晶料排出管;33、排风管;34、吸收液储箱;35、氯化铁溶液管;36、液位计;37、电控箱;38、循环水池。
具体实施方式:
下面结合附图并通过具体实施方式来进一步说明本发明的技术方案。
请参阅图1所示,本实施例中,一种用于盐酸酸洗废水浓缩结晶分离零排放设备:
所述盐酸酸洗废水过滤装置,该装置中包括废水管1用于从车间酸洗槽接纳酸洗废水至调节池2、经过废水过滤泵3后进入袋式过滤器4,过滤后进入废水箱6,废水箱安装液位计5,经过废水提升泵进入沉淀池31。
所述原水蒸汽制备装置,该装置包括原水进水管15,软化器14和软化水箱12,安装有液位计13,软水提升泵16提升软化水到蒸汽锅炉17,产出蒸汽进入废水加热器10热进端,疏水阀11通过管路连接废水加热器热出端,疏水阀11自动排除加热设备或蒸汽管道中的蒸汽凝结水及空气等不凝气体,蒸汽凝结水自动返回到软化水箱12。
所述蒸发装置包含蒸发器19、沉淀池31,蒸发器19安装在机架Ⅰ20上,沉淀池31在蒸发器19的下方,沉淀池中装有温控仪9和液位计36,蒸发器进风口装有空气过滤器18,蒸发器出风口装有风管至引风机29,蒸发提升泵8通过管道连接至废水加热器10冷进端,其冷出端连接至蒸发器19喷淋管。
所述结晶分离装置中结晶釜21在离心机23的上方,两者安装在机架Ⅱ上,浓缩液提升泵30通过管道连接沉淀池31出口,其出口管路连接至结晶釜21进料口。
所述循环水冷却装置包括冷却塔24、循环水池38、循环泵25,循环泵25通过管路连接一级吸收塔26和二级吸收塔27内冷却盘管冷端进口,冷却盘管冷端出口连接至结晶釜21冷端进口,其冷端出口连接至冷却塔24。
所述两级吸收塔包含一级吸收塔26和二级吸收塔27,其上有进风口和出风口、塔外循环喷淋泵和循环管路,在二级吸收塔27塔身装有视镜,二级吸收塔填料部上部有开口,开口通过管路连接至活性铁投料机28,一级吸收塔26通过管道连接吸收液储箱,二级吸收塔27通过管道连接至废水调节池2。
所述的一种盐酸酸洗废水浓缩结晶分离零排放设备,还设置有电控箱37,所述电控箱37与设备上所有的电气组件电性连接。
工作时,使原水经软化器14处理后进入软水箱12,开启软水提升泵16进入蒸汽锅炉17,使蒸汽锅炉17处于待启动状态;往两级吸收塔内灌入吸收液,开启引风机29和两级吸收塔的循环泵使吸收液在塔内处于循环状态,接下来使酸洗废水进入调节池2,经废水过滤泵3进入袋式过滤器4过滤后进入废水箱6,废水提升泵7泵出废水进入沉淀池31,到达液位计预设液位后停废水提升泵7,开启蒸发提升泵8,其泵出的废水经过废水加热器10后抵达蒸发器19内喷淋头喷淋,喷淋液流经填料落入沉淀池,开始循环,在电控箱37开启按钮启动蒸汽锅炉17产出蒸汽至废水加热器10对废水加热,加热后蒸汽里的不凝汽通过疏水阀排出,凝结水回到软水箱12;温控仪9采集沉淀箱里浓缩液温度,当温度超过设定温度时发出控制信号给锅炉17,减少蒸汽供应量;沉淀池液位计36探测到液位抵达预设液位,开启浓缩液提升泵30将浓缩液泵至结晶釜,开启循环泵25和冷却塔24风机,使冷却水在两级吸收塔和结晶釜21进行冷却循环,浓缩液在结晶釜21结晶稠厚后,开启底部阀门卸料至离心机23,开启离心机23固液分离,离心机下出口分离出氯化铁晶体,滤液自流至沉淀池31;一级吸收塔26吸收箱中吸收液溢流排出吸收液至吸收液储箱34,二级吸收塔27吸收箱中吸收液浓度达到规定值后排至废水调节池2,重新进行蒸发处理。
以上实施例只是阐述了本发明的基本原理和特性,本发明不受上述事例限制,在不脱离本发明精神和范围的前提下,本发明还有各种变化和改变,这些变化和改变都落入要求保护的本发明范围内,本发明要求保护范围由所附的权利要求书及其等效物界定。
Claims (5)
1.一种盐酸酸洗废水浓缩结晶分离零排放设备,包括盐酸废水过滤装置、原水蒸汽制备装置、废水加热器、蒸发器、沉淀池、结晶分离装置、机架、二级气体吸收塔、冷却塔以及电控箱,所述盐酸废水过滤装置包括废水调节池、袋式过滤器和废水箱,且废水箱安装液位计,废水通过管道连接水泵对废水进行过滤,所述原水蒸汽制备装置包括软化器、软化水箱、疏水阀和蒸汽锅炉,且软化水箱内安装液位计,所述废水加热器为蒸汽加热,用于加热盐酸废水,所述结晶分离装置包括结晶釜和离心机,所述加热器、蒸发器、结晶釜和离心机安装在机架上,沉淀池在机架下方,沉淀池内安装有沉淀斜板、中隔板和上升导流板,且装有温控仪和液位计,所述蒸发器、沉淀池底部开有回流孔,沉淀池、提升泵、加热器、蒸发器通过管道连接作为废水加热蒸发回流管路,沉淀池、浓缩液提升泵、结晶釜、离心机通过管道连接作为浓缩液结晶回流管路,所述冷却塔与结晶釜、气体吸收塔相连,所述蒸发器顶部进风口装有空气过滤器,出风口装有引风机,引风机通过风管与一级气体吸收塔相连,所述二级气体吸收塔通过气管与一级吸收塔相连,所述二级吸收塔顶部侧面上方装有活性铁投料机。
2.根据权利要求1所述的用于盐酸酸洗废水浓缩结晶分离零排放设备,其特征在于,所述废水过滤泵、液位计、废水提升泵、温控仪、蒸发提升泵、软化器、蒸汽锅炉、引风机、结晶釜、离心机、冷却塔、循环泵、二级气体吸收塔、活性铁投加机、均通过电控箱电连接。
3.根据权利要求1所述的用于盐酸酸洗废水浓缩结晶分离零排放设备,其特征在于,所述加热器为蒸汽加热石墨加热器。
4.根据权利要求1所述的用于盐酸酸洗废水浓缩结晶分离零排放设备,其特征在于,所述蒸发器分离端装有挥发分离材料和废水喷头,在蒸发器除雾端装有塑料丝网除沫器、蜂窝除雾器、板式除雾器的任一种。
5.根据权利要求1所述的用于盐酸酸洗废水浓缩结晶分离零排放设备,其特征在于,所述气体吸收塔液槽内装有冷却盘管,并在第一、二级吸收塔装有喷淋头和填料,塔外吸收液循环泵和管道。
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