CN112362989B - 高压静电除尘器火花放电模拟装置及试验方法 - Google Patents

高压静电除尘器火花放电模拟装置及试验方法 Download PDF

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CN112362989B
CN112362989B CN202011188666.6A CN202011188666A CN112362989B CN 112362989 B CN112362989 B CN 112362989B CN 202011188666 A CN202011188666 A CN 202011188666A CN 112362989 B CN112362989 B CN 112362989B
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张晓星
张瑞
邓迁君
郭英豪
金硕
韩文豪
吴铁洲
熊兰
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XIANGYANG JIUDING HAOTIAN ENVIRONMENTAL PROTECTION EQUIPMENT CO Ltd
Hubei University of Technology
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Abstract

公开了一种高压静电除尘器火花放电模拟装置及试验方法,所述模拟装置包括用于提供试验电压的脉冲电源(1)、用于模拟除尘器阳极的阳极筒(6)、用于模拟除尘器阴极的阴极杆(5)、用于模拟除尘器电极电容的脉冲电容器单元(301,302)、用于悬挂阴极杆(5)的绝缘支架、用于测量电极电压的分压器(2)、用于测量接地电流的接地电流采样单元(8)。通过所述模拟装置模拟高压静电除尘器的放电过程,对其放电电流、放电能量等放电特征参数进行测量。本发明实现了不同负载情况下,除尘器火花放电特性的模拟,便于测量,有利于对高压静电除尘器火花放电特性及抑制措施进行研究。

Description

高压静电除尘器火花放电模拟装置及试验方法
技术领域
本发明涉及静电除尘器火花放电领域,尤其涉及一种高压静电除尘器火花放电模拟装置及试验方法。
背景技术
高压静电除尘是目前工厂中常用的除尘方法,具有除尘效率高、能耗低等优势。为提高除尘器的荷电率,提升除尘效率,目前大多数高压静电除尘器多采用直流叠加窄脉冲的电压激励。但过高的电压会造成除尘器阴极和阳极之间的电场击穿,发生火花放电。火花放电不仅会导致电压瞬间下降,使除尘器失去除尘效果,影响除尘电源等设备的状态。在针对焦炉煤气等可燃气体的进行高压静电除尘时,火花放电甚至还会导致气体爆炸,造成严重安全事故。因此需要对高压静电除尘器火花放电的特性进行研究,以进一步改进除尘器的设计,从源头抑制除尘器工作时可能出现的火花放电。
目前关于高压静电除尘器火花放电的研究主要是针对火花放电出现以后如何进行智能化控制,避免再次放电,降低火花率。但关于除尘器中火花放电本身的相关特性,受试验条件的限制目前相对较少。高压静电除尘器体积庞大,若直接在除尘器上开展相关试验,接线、测量等存在诸多不便,难以获取火花放电时各个部位的放电信号,还存在安全隐患。
发明内容
本发明提供一种高压静电除尘器火花放电模拟装置及试验方法,以解决进行高压静电除尘器火花放电研究时,试验及相关测量难以实现的问题。
根据本发明实施例的一方面,一种高压静电除尘器火花放电模拟装置,包括:
脉冲电源,用于提供试验电压;
分压器,用于测量电极电压;
脉冲电容器单元,包括用于模拟除尘器中发生火花放电的除尘管的第一脉冲电容,和模拟与发生火花放电的除尘管并联的其他除尘管的电容的第二脉冲电容;
金属杆,横向设置在绝缘支架上;
阴极杆,用于模拟除尘器阴极,所述阴极杆一端与所述金属杆连接,另一端置于用于模拟除尘器阳极的阳极筒内;以及
接地电流采样单元,用于测量接地电流;
其中,所述脉冲电源、所述分压器、所述第一脉冲电容、所述第二脉冲电容的高压端依次相连后连接至所述金属杆,所述分压器的接地端与所述第一脉冲电容的接地端相连,所述脉冲电源的接地端、所述第一脉冲电容的接地端和所述阳极筒经所述接地电流采样单元连接至试验场地的接地点,所述第二脉冲电容的接地端连接至试验场地的接地点。
在一些示例中,所述阴极杆位于所述阳极筒内的部分具有芒刺。
在一些示例中,所述阴极杆底部具有保证其垂直布置的配重块。
在一些示例中,所述阳极筒为正棱柱结构,所述阳极筒与所述阴极杆保持同轴布置。
在一些示例中,所述阳极筒底部具有保证其垂直布置的另一配重块。
在一些示例中,所述脉冲电源与除尘器所用脉冲电源相同。
在一些示例中,所述接地电流采样单元包括三组参数相同的无感电阻,所述脉冲电源的接地端、所述第一脉冲电容的接地端、所述阳极筒分别经一组无感电阻连接至试验场地的接地点。
根据本发明实施例的另一方面,利用所述的高压静电除尘器火花放电模拟装置进行模拟试验,实验方法包括:
测量除尘器阳极和阴极之间的电容C1,测量所述阴极杆和所述阳极筒之间的电容C2,结合除尘器的除尘管数量n和所述分压器电容CD,分别计算试验所需的所述第一脉冲电容和所述第二脉冲电容的电容值,将对应电容值的所述第一脉冲电容和所述第二脉冲电容连接在所述高压静电除尘器火花放电模拟装置上;
采用示波器进行放电信号的测量,其中所述分压器的输出信号和所述接地电流采样单元两端电压信号接入示波器的通道;
将所述脉冲电源连接至供电电源,上调所述脉冲电源的输出电压,直至出现火花放电现象,然后下调所述脉冲电源的输出电压,直至不再发生火花放电,用示波器记录此时所述接地电流采样单元两端电压峰值U1
将示波器设置为单次上升沿触发模式,触发电平调整至2U1,然后升高所述脉冲电源的输出电压,使得发生火花放电时示波器记录所述接地电流采样单元两端的电压波形u(t)以及所述分压器输出的电压波形u2(t);
根据示波器记录的所述接地电流采样单元两端电压波形u(t)换算流过所述接地电流采样单元的电流波形i(t);
根据示波器记录的所述分压器输出的电压波形u2(t),以及所述接地电流采样单元的电流波形i(t),对火花放电时放电信号特征进行分析。
在一些示例中,所述第一脉冲电容的电容值为C301=C1×(n-1)/n–CD,所述第二脉冲电容的电容值为C302=C1/n–C2
本发明以电容等效的方式实现了实验室中高压静电除尘器火花放电的模拟。本发明的试验装置结构简单,占用空间较小,测量方便。实际情况中高压静电除尘器各放电管的阳极紧密接触,难以分别测量,而通过本发明中两组脉冲电容的布置,可以分别对发生火花放电时火花放电所在的除尘管、未发生火花放电的除尘管、脉冲电源等支路输出的放电能量进行测量和分析。另外,本发明提出的模拟试验装置可根据实际情况选择相应的脉冲电容进行等效,可适用于不同类型高压静电除尘器的模拟。根据本发明提出的试验装置和试验方法,可进一步对高压静电除尘器火花放电的电气特性进行深入研究。
附图说明
为了更清楚地说明本发明实施例的技术方案,下面将对实施例的附图作简单地介绍。
图1为本发明一实施例提供的高压静电除尘器火花放电模拟装置结构示意图。
图2为本发明一实施例提供的高压静电除尘器火花放电模拟装置的电路结构示意图。
具体实施方式
在实验室中搭建等效试验模型,对静电除尘器进行电气特性的等效,一方面可缩小试验所需的空间,另一方面可根据实际需求灵活设置监测点,便于对除尘器火花放电的放电能量及来源、放电电流等特性进行深入的研究。
如图1和图2,一种高压静电除尘器火花放电模拟装置包括用于提供试验电压的脉冲电源1、用于测量电极电压的分压器2、用于模拟除尘器电极电容的脉冲电容器单元、用于模拟除尘器阴极的阴极杆5、用于模拟除尘器阳极的阳极筒6、用于悬挂阴极杆的金属杆4、用于支撑金属杆4的绝缘支架7、用于测量接地电流的接地电流采样单元8。
绝缘支架7用于支撑金属杆4以及金属杆4上悬挂的阴极杆5。绝缘支架7左右两部分顶部与金属杆4两端固定连接,构成门型支架结构。金属杆4中间部位设置悬挂点,悬挂阴极杆5。阴极杆5上装设芒刺。当阴极杆5杆长1.6m时,可在下部1m长度范围内装设所述芒刺。阴极杆5底部悬挂配重块,用以保证垂直布置。阴极杆5悬挂在金属杆4上后伸入阳极筒6内。阴极杆5上的所述芒刺在阳极筒6内。阳极筒6为正棱柱结构,底部焊接另一配重块用以避免倾倒。阳极筒6与阴极杆5保持同轴布置。
脉冲电源1与除尘器所用脉冲电源相同,以保证本发明模拟装置与除尘器电源激励的一致性。所述脉冲电容器单元包括第一脉冲电容301及第二脉冲电容302。其中,第一脉冲电容301用于模拟除尘器中发生火花放电的除尘管电容,第二脉冲电容302用于模拟与之并联的其他除尘管的电容。
所述接地电流采样单元包括三组参数相同的无感电阻801,802,803,阻值可为0.1Ω。
脉冲电源1、分压器2、第一脉冲电容301、第二脉冲电容302的高压端采用导线依次相连后,连接至金属杆4。
分压器2的接地端采用绝缘导线与第一脉冲电容301的接地端相连,第一脉冲电容301的接地端还通过绝缘导线与无感电阻802相连,无感电阻802的另一端采用绝缘导线连接至试验场地的接地点。
第二脉冲电容302的接地端采用绝缘导线与试验场地的接地点相连。同时阳极筒6通过绝缘导线与无感电阻803相连,无感电阻803的另一端采用绝缘导线连接至试验场地的接地点。
在示例性实施例中,还提供一种高压静电除尘器火花放电模拟试验方法,采用上文所述的高压静电除尘器火花放电模拟装置进行试验,具体试验步骤见下文。
步骤1,测量除尘器阳极和阴极之间的电容C1,测量阴极杆5和阳极筒6之间的电容C2。根据除尘器的除尘管数量n,分压器2电容CD,分别计算试验所需的第一脉冲电容301和第二脉冲电容302的电容值。计算方法如下:试验所需的第一脉冲电容301的电容值为C301=C1×(n-1)/n–CD;试验所需的第二脉冲电容302的电容值为C302=C1/n–C2
步骤2,按图2所示的电路连接试验回路。采用4通道以上的示波器进行放电信号的测量,示波器的4组通道分别接入分压器2的输出信号,无感电阻801,802,803的两端电压信号。将脉冲电源1连接至相应的供电电源。
步骤3,结合分压器2输出的信号,调节脉冲电源1,缓慢升高输出电压,直至听到明显的火花放电声音或示波器中的信号波形突然发生大幅波动。然后缓慢下调脉冲电源1的输出电压,直至不再发生火花放电,用示波器记录此时其中一组无感电阻两端电压峰值U1
步骤4,将示波器设置为单次触发模式,触发电平调整至2U1。然后升高脉冲电源1的输出电压,发生火花放电时示波器将会触发并记录放电时分压器2输出的电压波形以及各无感电阻801,802,803两端的电压波形。
步骤5,根据示波器记录的各无感电阻801,802,803两端电压波形u(t)换算流过无感电阻801,802,803的电流波形i(t),二者换算关系为:i(t)=2u(t)。
步骤6,结合示波器记录的分压器2输出的电压波形u2(t),以及各无感电阻801,802,803的电流波形i(t),对火花放电时各支路的放电信号特征进行分析。
本发明实现了不同负载情况下,除尘器火花放电特性的模拟,便于测量,有利于对高压静电除尘器火花放电特性及抑制措施进行研究。

Claims (9)

1.一种高压静电除尘器火花放电模拟装置,其特征在于,包括:
脉冲电源(1),用于提供试验电压;
分压器(2),用于测量电极电压;
脉冲电容器单元,包括用于模拟除尘器中发生火花放电的除尘管的第一脉冲电容(301),和模拟与发生火花放电的除尘管并联的其他除尘管的电容的第二脉冲电容(302);
金属杆(4),横向设置在绝缘支架(7)上;
阴极杆(5),用于模拟除尘器阴极,阴极杆(5)一端与金属杆(4)连接,另一端置于用于模拟除尘器阳极的阳极筒(6)内;以及
接地电流采样单元(8),用于测量接地电流;
其中,脉冲电源(1)、分压器(2)、第一脉冲电容(301)、第二脉冲电容(302)的高压端依次相连后连接至金属杆(4),分压器(2)的接地端与第一脉冲电容(301)的接地端相连,脉冲电源(1)的接地端、第一脉冲电容(301)的接地端和阳极筒(6)经接地电流采样单元(8)连接至试验场地的接地点,第二脉冲电容(302)的接地端连接至试验场地的接地点。
2.根据权利要求1所述的高压静电除尘器火花放电模拟装置,其特征在于,阴极杆(5)位于阳极筒(6)内的部分具有芒刺。
3.根据权利要求1所述的高压静电除尘器火花放电模拟装置,其特征在于,阴极杆(5)底部具有保证其垂直布置的配重块。
4.根据权利要求1所述的高压静电除尘器火花放电模拟装置,其特征在于,阳极筒(6)为正棱柱结构,阳极筒(6)与阴极杆(5)保持同轴布置。
5.根据权利要求1所述的高压静电除尘器火花放电模拟装置,其特征在于,阳极筒(6)底部具有保证其垂直布置的另一配重块。
6.根据权利要求1所述的高压静电除尘器火花放电模拟装置,其特征在于,脉冲电源(1)与除尘器所用脉冲电源相同。
7.根据权利要求1所述的高压静电除尘器火花放电模拟装置,其特征在于,接地电流采样单元(8)包括三组参数相同的无感电阻(801,802,803),脉冲电源(1)的接地端经第一 无感电阻(801)连接至试验场地的接地点,第一脉冲电容(301)的接地端经第二 无感电阻(802)连接至试验场地的接地点,阳极筒(6)经第三 无感电阻(803)连接至试验场地的接地点。
8.一种高压静电除尘器火花放电模拟试验方法,其特征在于,利用权利要求1-7任一项所述的高压静电除尘器火花放电模拟装置进行模拟试验,所述方法包括:
测量除尘器阳极和阴极之间的电容C1,测量阴极杆(5)和阳极筒(6)之间的电容C2,结合除尘器的除尘管数量n和分压器(2)电容CD,分别计算试验所需的第一脉冲电容(301)和第二脉冲电容(302)的电容值,将对应电容值的第一脉冲电容(301)和第二脉冲电容(302)连接在所述高压静电除尘器火花放电模拟装置上;
采用示波器进行放电信号的测量,其中分压器(2)的输出信号和接地电流采样单元(8)两端电压信号接入示波器的通道;
将脉冲电源(1)连接至供电电源,上调脉冲电源(1)的输出电压,直至出现火花放电现象,然后下调脉冲电源(1)的输出电压,直至不再发生火花放电,用示波器记录此时接地电流采样单元(8)两端电压峰值U1
将示波器设置为单次上升沿触发模式,触发电平调整至2U1,然后升高脉冲电源(1)的输出电压,使得发生火花放电时示波器记录接地电流采样单元(8)两端的电压波形u(t)以及分压器(2)输出的电压波形u2(t);
根据示波器记录的接地电流采样单元(8)两端电压波形u(t)换算流过接地电流采样单元(8)的电流波形i(t);
根据示波器记录的分压器(2)输出的电压波形u2(t),以及接地电流采样单元(8)的电流波形i(t),对火花放电时放电信号特征进行分析。
9.根据权利要求8所述的高压静电除尘器火花放电模拟试验方法,其特征在于,第一脉冲电容(301)的电容值为C301=C1×(n-1)/n–CD,第二脉冲电容(302)的电容值为C302=C1/n–C2
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