Dynamic Steam Heating - Efficient Use of Low-Temperature and Low-Pressure Steam for Heating Different Media by Dynamic Steam Blending, 2007 Engineering, Pulping & Environmental Conference

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In this novel steam blending system, steam is added to the medium to be heated at a high relative speed. The dynamic mixing process provides even and fine distribution of the steam through the medium. The contact sur-faces of the various phases of the gaseous steam and the liquid medium are enlarged substantially. This results in rapid and careful heat transfer from the steam to the medium because the steam condenses immediately, mini-mizing steam bubbles.

The key component consists mainly of a mixer casing and a rotating steam manifold. The steam needed to heat the stock is fed to the manifold through the specially shaped casing. The manifold, which is mounted on the extended motor shaft, rotates at the motor speed. The rotating steam nozzles cover the entire cross-section and "plough" through the linear medium flow in radial direction. The large contact surfaces between the steam and the medium, as well as preventing local overheating of the medium, obviate condensation surges to a large ex-tent.