Compared to a conventional screw heat exchanger the new design, a 2:1 screw pitch ratio — and a corresponding 1:2 speed ratio between the two shafts —  provides self-cleaning operation, aided by narrow gaps between the screw flights. (Picture: Köllemann)
Modified Screw Heat Exchanger

Screw Heat Exchanger Keeping Itself Clean

For many industries that produce, process, or handle bulk solids, the screw heat exchanger is a well-known piece of equipment for heating, drying and cooling. With the same working principle as a conventional screw conveyor, however, most screw heat exchangers rely on the flowability of the bulk solid for good mixing and to keep their heat transfer surfaces clean. As a result, these standard screw heat exchangers cannot be used for sticky, pasty or adhesive materials or slurries.

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The EE871 CO2 sensor is highly resistant to hydrogen peroxide. (E+E Elektronik)
Sensors

Measuring Carbon Dioxide with High Accuracy

The digital EE871 probe from E+E Elektronik measures CO2 concentrations up to 50,000 ppm. The compact probe is now available with a special filter cap which ensures high accuracy and long-term stability in H2O2 contaminated environment such as the pharmaceutical and biotech industries.

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Back vanes (left) and balancing holes in conjunction with a throttling device (right) are two options to reduce axial thrust caused by different pressure profiles at the front and the rear impeller shroud. (Picture: KSB)
Chemical Pump

Designing a New Chemical Pump for the Global Market

A chemical pump must meet a variety of standards. Against the background of these standards, it seems very difficult to generate additional value for the customer that is not already explicitly covered in the standards’ scope. Nevertheless, designing a new chemical pump opens up new opportunities if expertise concerning application and experience in the field is taken as the basis for improvements.

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