| 摘要 |
There is provided a method for monitoring deposit build-up on spray nozzles in a spray drying or spray cooling chamber. The method comprises feeding drying air or cooling air into the chamber, and feeding a feed material to be spray dried or spray cooled into the chamber through one or more spray nozzles, thereby obtaining one or more sprays of feed material in contact with drying or cooling air. A digital reference image is obtained, which reference image has an image area comprising a first area of interest covering at least part of a spray nozzle and/or part of a feed material spray corresponding to a spray nozzle. A number of process images are obtained and recorded, where the process images cover the same image area as the reference image, the recorded process images are compared with the reference image, and a pixel difference, if any, is detected for the first interest area between similar addressed pixels within the reference image and each of the process images being compared to the reference image. The method further comprises determining for each or a part of the process images being compared to the reference image, a number of error pixels being the number of similar addressed pixels within the first area of interest for which a predetermined minimum pixel difference is detected. A notification is issued when a predetermined minimum number of error pixels within the first area of interest is determined for each of a predetermined number of consecutively recorded process images. The present invention also provides a system for monitoring spray nozzles in a spray drying or spray cooling chamber. |
