Setting up the water chemistry for thermal water treatment

Results are presented from the development and setting up of water-chemistry conditions for a thermal water treatment process that allows saline effluents from a boiler house to be eliminated. Peculiarities of reducing scale formation in the evaporator through the use of chalk primer and type PAF-13A antiscale agent are discussed. The results of industrial tests of a thermal water treatment plant are presented that confirm the possibility of producing makeup water for heating networks and steam boilers.     

Use of 140-ton ladles to transport liquid pig iron

At the end of 2003, the Chelyabinsk Metallurgical Combine began to use 140-ton ladles instead of 100-ton ladles to transport liquid pig iron to its oxygen converter shop. The larger ladles comprised roughly 55% of the ladle stock in 2006 and transported 65% of the pig iron to the shop. Use of the 140-ton ladles has markedly improved adherence to the tapping schedule and sharply reduced the number of inadequately processed blast-furnace heats. It has also increased the temperature of the pig iron in the converter shop due to the smaller heat losses in the larger ladles.     

Portable Planar DMA: Development and Tests

A novel high-resolution planar and portable differential mobility analyzer (DMA) has been designed and built (Nano-ID® PMC500, Naneum, Canterbury, UK). Finite element multi-physics numerical modeling was employed to optimize the geometry of the DMA and to find a regime for high resolution within the confines of a portable instrument. The numerical approach for solving the Navier–Stokes equation was verified by comparison of calculated data to experimental values. The PMC500 was calibrated and tested with different monodisperse aerosol challenges. The PMC500 portable DMA is shown to have good sizing accuracy and resolution, similar in performance to commercially available desktop instruments.

Copyright 2014 American Association for Aerosol Research     

Computational and analytical studies of the processes in electromagnetic bearings in adjustment of the rotor of a turbine engine

The stability of an electromagnetic bearing control system-rotor system with a nonlinear dependence of the magnetic force on the control current is studied by analytical and experimental methods. The possibility of implementing an electromagnetic suspension of a rotor in the absence of currents of initial magnetic biasing is demonstrated. The advantages and disadvantages of such an implementation of the control system are determined. A program for calculating the time evolution of the motion of a rotor on electromagnetic bearings is developed and implemented in practice. A technique for verifying the program under conditions where initial data for calculations are not known accurately is proposed.     

Structure,Texture, and Substructure of Foil in Sequential Rolling Steps of Cu–36.4 at % Pd Alloy

Inorganic Materials - The phase composition, texture, and substructure of foil of a Cu–36.4 at % Pd solid solution have been studied by X-ray diffractometry and electron diffraction after...