净水站斜板沉淀池斜板改型升级
第36卷第4期2014年4月华电技术Huadian Technology
Vol.36No.4
Apr.2014
净水站斜板沉淀池斜板改型升级
夏文武
(广东惠州天然气发电有限公司,广东惠州516082)
摘
要:以广东惠州天然气发电有限公司为例,分析了一期净水站2ˑ 700t /h斜板沉淀池存在的问题。改用新型斜板和
新型卡扣连接方式后,净水站斜板沉淀池恢复了安全、稳定、经济的运行状态。关键词:净水站;斜板;沉淀池;改性;卡扣连接中图分类号:TK 223.5
文献标志码:B
文章编号:1674-1951(2014)04-0047-02
0引言
广东惠州天然气发电有限公司(以下简称惠州
天然气发电)化学水处理水源为风田水库水,其工艺流程如下:原水→斜板沉淀池→服务水池→变频升压泵→自清洗过滤器→超滤装置(UF )→过滤水箱→反渗透给水泵→保安过滤器→变频高压泵→反渗透装置(RO)→中间水箱→中间水泵→混合离子交换器→除盐水箱→除盐水泵→用户。
化学水处理系统最大连续出力为280t /h。预
2套125脱盐系统为2套167t /h出力的超滤装置,
t /h出力的反渗透装置和1套出力60t /h的浓水反渗透装置;除盐系统为4套出力184t /h混合离子交
3
换器,除盐水箱容积为2ˑ 3000m 。
但在实际生产过程中,不排除有些厂家为降低成本
而使用聚乙烯(PE )和聚丙烯树脂(PP )加温混合材料(即所谓乙丙共混材料,其性能要差很多),甚至
造成沉淀设备在使用过程使用回收废料以次充好,中易老化、破损,并严重滋生藻类。
1用1惠州天然气发电的斜板沉淀池共2列,
备,基本按月轮流切换运行。一列斜板沉淀池运行时,另一列斜板沉淀池有时要进行人工排泥和清洗等工作。在斜板清洗过程中,该列斜板沉淀池的水这样就露出斜板本身,便于用位会维持在相对低位,
自来水冲洗斜板的上部。惠州天然气发电地处惠州夏季漫长且阳光炙热,斜板在多次清洗大亚湾海边,
过程中和清洗后的一段时间内,由于裸露在空气中阳光暴晒使材质加速老化,严重影没有了水的保护,响其使用寿命。
1斜板沉淀池工作现状
#
惠州天然气发电一期净水站2ˑ 700t /h的1,#
2斜板沉淀池自2005年10月投产运行以来,前期运行一直较为稳定。2012年初现场实地检查发现,2个斜板沉淀池内的斜板在长期水力冲刷和太阳直晒下,乙丙共聚(OGP )材质的斜板已大面积破损,用手指轻触就会出现破碎的板材细片,严重影响原水的反应沉淀效果。同时,现在所用斜板的连接方式为热熔焊接,在材料变性情况下,已无法进行修复。
3斜板改型
有鉴于此,改性后新型斜板不再采用热熔焊接
不再采用PP 材质,转而采用新型卡扣连方式连接,
接方式(如图1所示),使用改性聚对苯二甲酸乙二
醇酯(PET )材质。新型斜板须满足现有系统设计要求,确保出水水质及系统稳定性;要满足耐用抗晒、化学稳定性好、安全环保的要求;要符合水力学原理,水流阻力小、沉淀效果好且牢固不易变形。
采用PET 材质的新型斜板为淡蓝色透明薄板,具有抗蠕变、耐疲劳、耐摩擦等机械性能,以及耐酸碱、抗日晒、防老化、耐高低温等化学性能,设备内部符合流体力学原理,水流阻力小、沉淀效果好,满足设计出水水质要求。无毒丙烯腈-丁二烯-苯乙烯(ABS )肋条的物理性能优于钢材,牢固耐用;斜板采用V 形结构;夹心结构的沉淀板更加坚固、抗延展;独有的面层抗紫外线、抗菌配方可有效防老化、防止藻类滋生;特殊配方的面层也使斜板表面更加更利于排泥。光滑,
斜板沉淀池为惠州天然气发电原水预处理的核心设
备,是整个除盐水制水工艺系统的核心净水设备。斜板沉淀池出水的好坏直接影响后续超滤装置的制水质量,并间接影响反渗透装置、混合离子交换器的制水质量,最终影响除盐水的品质,从而危及向主机、供热锅炉及厂外直接水用户充足供给优质除盐水。
2斜板沉淀池现状分析
惠州天然气发电现有沉淀设备使用OCP 材料,
收稿日期:2013-11-13;修回日期:2014-03-20
等参数与添加剂种类和添加量的关系等问题。新型斜板采用三明治夹层式结构,包括支持层和功能层,如图3所示。支持层为增强性PET 材料,用于满足设备对片材耐光性、刚性及韧性的要求,功能层为功能改性PET 材料,用于提高片材的粗糙度,具有防藻类滋生及杀菌作用。通过覆膜可避免片材表面在后续加工过程中划伤
。
图1新型斜板材质及其卡扣连接方式
新型斜板的创新突破:基于浅层沉淀理论,寻求斜板间距的极限值来提高沉淀效率;纵向V 形流道设计,形成流道内流体顶托力的线性分布,有利于悬浮泥渣层的形成,可提高接触絮凝几率;材料具备静强化接触絮凝效率。电分离功能,
浅池沉淀理论:池子越浅,其沉淀距离越短,沉淀效果越好,而且在相同池容时,斜板间距越小,沉淀面积越大,沉淀效果越好。V 形流道设计形成变截面,从而形成速度差,由于水流顶托力的不同,使得在斜板区域可以形成悬浮泥渣层,通过接触絮凝的作用去除对出水效果影响较大的微小矾花。纵向V 形流道设计如图2所示
。
图3
新型斜板片材结构
4结束语
惠州天然气发电对2列斜板沉淀池内旧斜板进
行拆除,并完成了新斜板改型更换和进水调试。这2列斜板沉淀池经过此次斜板改型升级之后,彻底污堵出口滤网和解决了旧斜板碎屑在运行时脱落,
工业服务水池等后续设备的问题;新斜板采用卡扣使得斜板的局部更换及获得连接方式及新型材料,
更长的使用寿命有了可能;新斜板安装投运以后,原沉淀效果更佳,可制得更低浊度的水,为水的反应、
后续除盐水处理系统提供更加优质的原料水。改造使净水站斜板沉淀池实现了升级达到了预期效果,
图2纵向V 形流道设计
安全、稳定、经济运行。
(本文责编:白银雷)
作者简介:
夏文武(1982—),男,安徽凤阳人,工程师,从事电厂mail :abin872110化学水处理设备管理与维护方面的工作(E-@163.com )。
在采用PET 材料作为斜板片材原料的同时,通过材料改性使其具有了抗菌及防止藻类生长等性
能,耐酸碱、耐日晒、耐高低温、不易老化且片材表面光滑。PET 材料改性实现方式:原料聚合过程中添加改性成分;片材挤出过程中将PET 材料和改性材料共混。这样成功解决了材料强度、韧性、静电吸附
3
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2004.北京:中国电力出版社,(上接第46页)
(本文责编:弋洋)
结束语
在汽轮机阀门整定过程中,需要厂家资料的支持和多单位的配合,排除多方面的不利情况,结合理论与实际,熟悉其原理和方法后才能逐步掌握调试过程。参考文献:
[1].吴华斌,李炳军.火电工程调试技术手册:热工卷[M ]
作者简介:
赵伟刚(1985—),男,陕西西安人,工程师,从事火力发
mail :zhapwg@163.com )。电热控调试方面的工作(E-黄湘(1969—),男,四川内江人,工程师,从事电厂自动mail :xiang23nj@163.com )。检修方面的工作(E-化调试、
王创博(1986—),男,陕西咸阳人,助理工程师,从事发
mail :wangchuangbo99@163.电厂及电力系统方面的工作(E-com )。
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