converters变换器convertern.转换器=convertor.converter with double-frequency双频变换器converter dust removal and sewage转炉除尘污水converter differential protection换流器差动保护converters from various suppliers多品牌变频器converter-side current feedback变换器侧电流反馈converters/one-cycle control变换器／单周控制converter / phase shift control变换器／移相控制converter/matrix conversion unit变换器／矩阵变换单元Converter-LF-RH-CC Flow Sheet转炉-LF-RH-CC流程Converter sludge pipeline transport转炉泥管道输送