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实用技术丨龙净环保——除尘用变频高压电源技术

2023-01-15 11:04:19来源:中国环保产业协会 阅读量:14492

导读:变频电源工作频率灵活可调,可根据电场工况自动调整变频电源调制频率和调制度,输出阻抗实时跟踪电场运行工况动态变化,实现与电除尘器电场阻抗的动态最佳匹配。
  导 语
 
  生态环境保护实用技术和示范工程是我会面向所有环保企事业单位的免费年度技术推广服务,从1991年至今我们已累计推广先进技术和工程4100多项。为便于相关方使用《2021年重点生态环境保护实用技术和示范工程名录》(详见关于发布《2021年重点生态环境保护实用技术和示范工程名录》的公告),我会编制了入选技术和工程的简介,将陆续在我会官微和公布。简介内容均由入选项目的申报单位提供。
 
  2021-44
 
  技术名称
 
  龙净环保——除尘用变频高压电源技术
 
  申报单位
 
  福建龙净环保股份有限公司
 
  推荐单位
 
  福建省环境保护产业协会
 
  适用范围
 
  适用于电力、冶金、建材、化工等行业除尘。
 
  主要技术内容
 
  一、技术简介
 
  基本原理
 
  变频电源主回路包括整流电路、滤波电路、IGBT逆变器和整流变压器四个部分,采用AC→DC→AC→DC变流方式,将三相进线交流电压经过整流电路整流为直流电压,然后经SPWM逆变后通过变压器升压整流,输出电压纹波系数低于3%的平滑直流高压电压。
 
  工艺路线
 
  变频电源输出纹波系数低,在全电场应用时,可适当提高前电场的峰值电压,同时降低后电场的输出功率,可达到提高除尘效率,并降低除尘器能耗。在反电晕严重的电场,可采用间歇式供电的模式,有效抑制反电晕并保证除尘效果。
 
  变频电源工作频率灵活可调,可根据电场工况自动调整变频电源调制频率和调制度,输出阻抗实时跟踪电场运行工况动态变化,实现与电除尘器电场阻抗的动态最佳匹配,使电除尘器电场获得最高的电功率和最佳的供电效果。
 
  技术应用数量
 
  完成技术应用案例近100项,装备应用1000多台/套,截至2021年年底累计销售额为20000多万元。
 
  应用效果
 
  有效减低粉尘排放,同时降低电除尘器运行能耗。
 
  技术特点
 
  (1)变频电源输出频率100~1000Hz,可以给电除尘提供接近纯直流的电压,输出二次电压纹波系数小于3%,远好于工频电源35%~45%的纹波系数,可提高电场电晕功率,减少闪络的产生,提高电场除尘效率;
 
  (2)变频电源输出直流电流单波周期最小为1 ms,间歇脉冲供电方式灵活可调,间歇比调节范围大,同时可更改工作频率以调整脉冲波形,具有很好的工况适应性;
 
  (3)变频电源由IGBT组成逆变器,采用SPWM开关工作模式,可即时快速熄灭火花,并迅速恢复电场供电;
 
  (4)根据电场工况自动调整变频电源调制频率和调制度,输出阻抗实时跟踪电场运行工况动态变化,实现与电除尘器电场阻抗的动态最佳匹配,使电除尘器电场获得最高的电功率和最佳的供电效果;
 
  (5)变频电源采用控制柜与变压器分离的结构形式,控制柜放置在控制室内,整流变放置在本体顶部,稳定性高,维护方便。
 
  获得奖励荣誉情况
 
  “一种除尘用叠加式电源控制系统”获福建省专利奖二等奖。
 
  二、典型应用案例
 
  案例名称
 
  方大特钢科技股份有限公司炼铁厂130 m2烧结机头电除尘变频电源改造项目。
 
  案例简介
 
  该项目由福建龙净环保股份有限公司负责方大特钢科技股份有限公司炼铁厂130 m2烧结机头电除尘检修,主要包含阴极芒刺线更换、阳极板排检修、阴阳极振打装置检修等本体检修工作和8套变频电源升级改造。由业主负责日常运行维护工作。
 
  达到的标准或性能要求
 
  经电除尘器处理后烟气粉尘排放浓度≤20 mg/Nm3
 
  业主单位
 
  方大特钢科技股份有限公司。
 
  投运时间
 
  2019年7月。
 
  工艺流程
 
  变频电源将三相进线交流电压经过整流、SPWM逆变后通过变压器升压整流,输出电压纹波系数低于3%的平滑直流高压电压至电除尘本体,含尘气体经过高压静电场时被电分离,尘粒与负离子结合带上负电后,趋向阳极表面放电而沉积。
 
  运行情况
 
  130 m2烧结机头,烟气量50万m3/h,该企业正常生产,生产负荷≥75%,颗粒物排放浓度低于20 mg/Nm3,运行能耗比常规除尘器降低30%以上,实现了钢铁烧结机头超低排放和节能运行。

  原标题:实用技术丨龙净环保——除尘用变频高压电源技术

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