| 摘要 |
An annular gap injector, more particularly, for one or more injector steps, for cleaning dust filters during waste gas purification is improved in such a way that it can be controlled without any valve controls on the admission of the cleaning gas to purify filter elements, whereby the annular gap injectors can be activated individually in a purification device depending on the amount of particles adhered to the associated filter elements leading to an almost continuos removal of the particles from the purification device without disrupting the processing facility upstream. To this end, a blocking element, e.g. a circular ring membrane (4) or a valve is mounted on the channel (14), said valve blocking the passage of the cleaning gas to the annular gap (13) and, if required, releasing the passage of the cleaning gas via the annular gap (13) to the outflow. |
