CN104903002A - 用于特定小型秸秆锅炉烟气净化的电滤器 - Google Patents

用于特定小型秸秆锅炉烟气净化的电滤器 Download PDF

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CN104903002A
CN104903002A CN201380061244.4A CN201380061244A CN104903002A CN 104903002 A CN104903002 A CN 104903002A CN 201380061244 A CN201380061244 A CN 201380061244A CN 104903002 A CN104903002 A CN 104903002A
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collecting board
electrofilter
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约根·奥弗达尔
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/74Cleaning the electrodes
    • B03C3/76Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02Plant or installations having external electricity supply
    • B03C3/04Plant or installations having external electricity supply dry type
    • B03C3/08Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02Plant or installations having external electricity supply
    • B03C3/04Plant or installations having external electricity supply dry type
    • B03C3/10Plant or installations having external electricity supply dry type characterised by presence of electrodes moving during separating action
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/40Electrode constructions
    • B03C3/41Ionising-electrodes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/40Electrode constructions
    • B03C3/45Collecting-electrodes
    • B03C3/47Collecting-electrodes flat, e.g. plates, discs, gratings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00Details of magnetic or electrostatic separation
    • B03C2201/04Ionising electrode being a wire

Abstract

一种用于烟气净化的电滤器,包括一组相互平行的正电极,所谓的收集板(1),形成多个相互平行的通道(2),待净化的烟气可以通过所述通道,并且通过一组负电极,所谓的放电线(3),悬吊在收集板(1)之间的中部,收集板(1)优选设计为圆形板,按照均一的相互距离安装在旋转轴(8)上,以及放电线(3)在公共框架(4)上悬吊着,振动器(5)安装在该公共框架上,可以振动从而清洁放电线(3)上的集尘。在电滤器(6)的框架上,固定刮板(10)安装在每个收集板(1)之间,固定刮板抵靠着每个收集板(1)并且清洁它们的灰尘。每个收集板(1)设计具有均匀分布的切口(15),可以吸收由于温度波动带来的收集板(1)的任意位移,从而确保收集板(1)在操作过程中保持完全或者近似为平面。另外,在每个收集板处安装导轮,其抵靠着收集板并且保持其为平面,使得刮擦过程变得高效。采用根据本发明的电滤器,可以防止过滤器中任意反向流动并且可以在无需持续向烟气中添加水或者化学物质的情况下保持过滤效率。

Description

用于特定小型秸秆锅炉烟气净化的电滤器
本发明涉及一种电滤器,主要由两个相应的正电极和负电极构成,都连接到高压源。电压的类型通常为脉动直流电压,通过对单相交流电压进行整流来产生该脉动直流电压。根据过滤器的尺寸和设计,电压水平为20到100kV。
电滤器的正电极通常由钢板,所谓的收集板组成,收集板相互间隔100到400毫米而悬吊,由此在板之间产生平行的通道,待净化的烟气以水平流通过该通道。出于安全因素,收集板通常是接地的,参见附图2。
负电极,所谓的放电线,可以是较细的电线,弹簧或者杆,悬吊在收集板之间的中部。
当放电线和收集板之间的电压足够高的时候,放电线将开始发射电子,这些电子将立即向正收集板移动。沿程电子将空气分子电离,此后空气分子被中性尘粒吸引,借此这些尘粒将带有负电荷并且被收集板吸引,参见附图2。
烟气中的尘粒一点点地落下来成为堆积在收集板上的一层。入口处的层厚度是最大的,并且沿着过滤器纵向以指数减小。通常采用锤或者振动器敲击这些尘土层,基本上可以将它们从收集板上移除。
这样可以释放掉落到收集板之下的灰斗内的尘土。随着电流从放电线向收集板流动,如果过程要持续而不受覆盖尘土的收集板的妨碍,那么集尘必须有一些导电能力。
通常导电能力由电阻率表示,其可以通过实验确定。如果所收集的尘土的电阻率在某一个数值之上,在收集板的尘土层上会产生相对很高的电压降。
如果该电压降超过某一水平,尘土层内颗粒之间的空气分子会被电离,并且尘土层会开始放出正离子,正离子向放电线移动并且使负离子中性化。这会引起电晕电流的剧烈增加,并且过滤效果将会突降。这种现象被称为逆流。在大型煤燃烧站,通过持续地向烟气内添加水或化合物可以减轻这个问题,从而改善尘土的导电能力。在小型秸秆锅炉内这是不现实的。
本发明的目的是描述一种能够用于净化特别是来自小型秸秆锅炉的烟气的电滤器。
这通过设计如权利要求1特征部分所述的电滤器获得。借此防止逆流,并且无需向烟气内持续添加水或化学物质就可以保持过滤效果。
权利要求2描述了根据本发明的电滤器中收集板内切口的设计。
权利要求3描述了根据本发明的电滤器中收集板内切口的替换设计。
采用权利要求4描述的设计,当收集板内温度波动时会获得切割效应,从而将可能堆积在切口内的任意尘块击碎。
权利要求5描述了根据本发明的电滤器收集板内切口的第三种设计。
采用权利要求6描述的设计,收集板形状稳定性进一步改善。
下面参考附图对本发明进行详细解释,其中:
附图1为现有的电滤器,
附图2示出了附图1所示电滤器的净化原理,
附图3为带有旋转收集板的电滤器的透视图和部分截面图,
附图4为带有旋转收集板的电滤器的侧视图,
附图5示出了与附图4所示对应的图,该图是从一端看到的并且在画出来的位置内带有放电线,
附图6表示旋转收集板,其中每个象限所设计的切口形状为圆环的一部分,这些部分在从一个象限到另一个象限的过渡部分处相互偏离。
附图7示出了沿附图6中的线I-I的截面视图,
附图8示出了具有直线的、近似径向的切口的旋转收集板,并且
附图9示出了旋转收集板,其中切口形状为通孔。
当放电线与收集板之间的电压足够高的时候,放电线开始发射电子e,其立即向正收集板1运动,收集板1通过线1’接地。这称为电晕充电。沿途电子e将空气分子m电离,此后受到中性灰尘颗粒s的吸引,借此这些颗粒变为带负电,并且受到收集板的吸引,参见图2。
如图3和4所示,根据本发明的电滤器6设计为有一排(例如11个)旋转圆形收集板1,以均一的相互距离安装在旋转轴8上。每个收集板1和相邻的收集板之间放置放电线,放电线可以安装在框架4上,框架上安装有振动器5,其可以清洁放电线3的灰尘。另外,电滤器6配备固定刮板10,其抵靠着每个旋转收集板1并且清理它们的灰尘,灰尘掉落到下面的灰斗11和12。待净化的气体通过入孔13引入到电滤器内,并且净化后通过出孔14排出。
如图6和8所示,旋转收集板1设计为具有切口15,可以是如图6所示的圆形,或者如图8所示的直线和近似径向。如图7所示,切口的一侧16相对于另一侧17可略微倾斜,所述另一侧与收集板1的表面垂直。这种方式下可以获得收集板1内温度波动时的切割效应,这可以击碎可能在切口上堆积的任意灰尘块。
如图9所示,收集板1还可以设计为一排通孔18而不是切口。
切口的形状还可以有别于如图6和8所示。
设计带有切口或通孔的收集板所具有的效果是,温度波动时收集板不会收缩和/或弯曲。因此如果使用固定刮板,就能获得期望和必要的清洁效果。为了使其更加确保收集板1不会弯曲,附图中没有示出的导轮安装在每个收集板处。

Claims (6)

1.一种用于烟气净化的电滤器,包括若干组正收集板(1)和负放电线(3),其中板(1)包括钢板,通过线(1’)接地,并且以相互之间100到400毫米的距离平行固定,由此在收集板(1)之间产生平行通道(2),待净化的烟气以水平流通过所述通道,并且在收集板(1)之间的中部悬吊负放电线(3),
其特征在于:
所述电滤器(6)被设计为具有一排优选为圆形的收集板(1),其按照均一的相互间距安装在旋转轴(8)上,每个收集板(1)和相邻板之间安装有一条或者多条放电线(3),所述一条或者多条放电线(3)从公共框架(4)处悬吊,所述公共框架上安装有振动器(5),所述振动器能够振动并且由此清除放电线(3)上堆积的灰尘,在电滤器(6)的框架上,在每对收集板(1)之间为每个收集板(1)安装有固定刮板(10),所述固定刮板抵靠着收集板并且能够清除收集板的灰尘,并且每个收集板(1)被设计为具有均匀分布的切口(15)或通孔,所述切口(15)或通孔能够吸收由于温度波动引起的收集板(1)的任意剪切、膨胀或收缩,使得收集板在操作过程中保持完全或者近似为平面,并且在每个收集板处安装有导轮,所述导轮抵靠着收集板并且保持收集板为平面,从而确保高效的刮除过程。
2.根据权利要求1所述的电滤器,其特征在于:
所述切口(15)的形状为部分圆环,所述部分圆环在每个象限中相互移位。
3.根据权利要求1所述的电滤器,其特征在于:
所述切口(15)为直线的并且是近似径向的。
4.根据权利要求2和3所述的电滤器,其特征在于:
所述切口(15)的一侧(16)相对于切口的另一侧(17)略微倾斜,所述另一侧与所述收集板(1)的表面垂直。
5.根据权利要求1所述的电滤器,其特征在于:
所述切口(15)的形状为具有圆锥形截面的一排通孔。
6.根据权利要求1所述的电滤器,其特征在于:
安装导轮,使得导轮抵靠着每个收集板(1)的外围。
CN201380061244.4A 2012-11-23 2013-10-16 用于特定小型秸秆锅炉烟气净化的电滤器 Pending CN104903002A (zh)

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DKPA201200739 2012-11-23
DKPA201200739A DK177588B1 (da) 2012-11-23 2012-11-23 Elektrofilter til røgrensning af røgen fra specielt mindre halmkedler
PCT/DK2013/000068 WO2014079447A1 (en) 2012-11-23 2013-10-16 Electrofilter for the purification of smoke from in particular minor straw boilers

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CN105536996A (zh) * 2016-01-02 2016-05-04 唐禹豪 一种电除尘装置
CN105536996B (zh) * 2016-01-02 2020-01-14 浙江得美环保科技有限公司 一种电除尘装置
CN108014921A (zh) * 2017-12-04 2018-05-11 东北师范大学 多传感器秸秆焚烧静电混合物收集装置
CN111355360A (zh) * 2020-04-08 2020-06-30 刘书德 一种电流型阻抗源交流的变频器

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ES2804675T3 (es) 2021-02-09
US20150246363A1 (en) 2015-09-03
NO20141082A1 (no) 2014-11-12
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