In this customer application, high-quality whey powder is obtained in a spray drying plant. The quality of the end product can be specifically adapted to the customer‘s requirements by concentrating the pre-product accordingly. This concentration of the dry matter can vary by more than 30° Brix, depending on the production batch. If the dry matter content deviates upwards from the specifications, the cooler can become clogged and fail. If the dry matter content is too low, the end product becomes too dusty and is partially lost in subsequent processing or becomes completely unsaleable and thus worthless.
In the evaporator, which is located upstream of the spray tower, the preliminary product is evaporated and cooled down again in a recurring process lasting up to 24 hours until the desired value is reached, then spray drying is started.
By a calibration in the test run, the Brix values which have to be specified for the IRM-11 could easily be determined and then used as a default setting for the production process. Depending on the required specification and composition of the final product this default can be set between 0 and 85° Brix for IRM-11.
The measuring interval can be individually adjusted starting from 2 seconds, so that continuous and reliable process monitoring can be ensured.
Due to lactose crystals in the pre-product, hot water rinsing is already carried out at certain intervals to prevent the cooler from clogging. The optical measuring system of the IRM-11 can also get covered by such a layer of solid particles, which may lead to measurement inaccuracies. The IRM-11 reports this by the drop of the result to 0° Brix. At the described customer application this could be remedied easily by slightly reducing the intervals and the duration of the hot water rinsing.
Anderson-Negele offers the testing of the IRM-11 refractometer directly in the process. This allows to verify the function in the operative application. Interested parties can contact our Pressure & Flow team via email, phone (0116 284 9900) or request a video meeting.
- Very compact (ø 66 mm, 480 gr.), flush refractometer with easy inline integration without bypass
- Output in °Brix, Plato, refractive index nD or customer specific
- Fully automatic measurement at the desired time interval (adjustable from 2 s)
- Process temperature up to 100 °C, CIP cleaning up to 140 °C / 60 min.
- Flush with the surface, therefore pig cleaning possible