scholarly journals Research on wear of chromite-periclase refractories in a reaction zone of zinc waelz-kiln

2016 ◽  
pp. 14-19 ◽  
Author(s):  
L. M. Akselrod ◽  
◽  
T. V. Yarushina ◽  
I. G. Maryasev ◽  
V. L. Nechunaev ◽  
...  
Keyword(s):  
Reaction Zone ◽  
Waelz Kiln

Chromite-Periclase Refractory Wear in Zinc Production Waelz Kiln Reaction Zone

2017 ◽  
Vol 57 (6) ◽  
pp. 563-568 ◽  
Author(s):  
L. M. Aksel’rod ◽  
T. V. Yarushina ◽  
I. G. Maryasev ◽  
I. V. Privalov ◽  
A. L. Andrievskikh
Keyword(s):  
Reaction Zone ◽  
Refractory Wear ◽  
Periclase Refractory ◽  
Zinc Production ◽  
Waelz Kiln

TEM characterization of reaction zone in a SiC fiber-reinforced titanium alloy

1988 ◽  
Vol 46 ◽  
pp. 738-739
Author(s):  
G. Das ◽  
R. E. Omlor
Keyword(s):  
Titanium Alloys ◽  
Reaction Zone ◽  
Carbon Layer ◽  
Fiber Reinforced ◽  
Reaction Products ◽  
Sic Fibers ◽  
Sic Fiber ◽  
The Matrix ◽  
Immense Potential

Fiber reinforced titanium alloys hold immense potential for applications in the aerospace industry. However, chemical reaction between the fibers and the titanium alloys at fabrication temperatures leads to the formation of brittle reaction products which limits their development. In the present study, coated SiC fibers have been used to evaluate the effects of surface coating on the reaction zone in the SiC/IMI829 system.IMI829 (Ti-5.5A1-3.5Sn-3.0Zr-0.3Mo-1Nb-0.3Si), a near alpha alloy, in the form of PREP powder (-35 mesh), was used a茸 the matrix. CVD grown AVCO SCS-6 SiC fibers were used as discontinuous reinforcements. These fibers of 142μm diameter contained an overlayer with high Si/C ratio on top of an amorphous carbon layer, the thickness of the coating being ∽ 1μm. SCS-6 fibers, broken into ∽ 2mm lengths, were mixed with IMI829 powder (representing < 0.1vol%) and the mixture was consolidated by HIP'ing at 871°C/0. 28GPa/4h.

Reaction Zone Weakening Effects under Hot and Diluted Oxidant Stream Conditions

2009 ◽  
Vol 181 (7) ◽  
pp. 937-953 ◽  
Author(s):  
Paul R. Medwell ◽  
Peter A. M. Kalt ◽  
Bassam B. Dally
Keyword(s):  
Reaction Zone

An Onion Peeling Reconstruction of the Spatial Characteristics of Entropy Waves in a Model Gas Turbine Combustor

2017 ◽  
Author(s):  
Dominik Wassmer ◽  
Felix Pause ◽  
Bruno Schuermans ◽  
Christian Oliver Paschereit ◽  
Jonas P. Moeck
Keyword(s):  
Gas Turbine ◽  
Reaction Zone ◽  
Equivalence Ratio ◽  
Acoustic Noise ◽  
Accurate Determination ◽  
Time Of Flight ◽  
Spark Discharge ◽  
Turbine Stage ◽  
Radial Temperature ◽  
Reconstructed Temperature

Entropy noise affects thermoacoustic stability in lean pre-mixed gas turbine combustion chambers. It is defined as acoustic noise that is emitted at the first turbine stage due to the acceleration of entropy waves that are advected from the reaction zone in the combustor to the turbine inlet. These non-isentropic temperature waves are caused by equivalence ratio fluctuations which are inherently present in a technically premixed combustion system. To experimentally study the generation and transport of entropy waves, an estimation of the spatial distribution of the entropy spots is highly valuable as it allows the accurate determination of the cross-section averaged entropy, which is the relevant quantity for the formation mechanism of entropy noise at the turbine stage. In this work, a time-of-flight based temperature measurement method is applied to a circular combustion test rig equipped with a premixed swirl-stabilized combustor. Downstream of the burner, an electric spark discharge is employed to generate a narrow acoustic pulse which is detected with a circumferentially arranged microphone array. The measured time of flight of the acoustic signal corresponds to the line-integrated inverse of the speed of sound between the acoustic source and each microphone. By modulating a share of the injected gaseous fuel, equivalence ratio fluctuations are generated upstream of the reaction zone and consequently entropy spots are advected through the axial measurement plane. The spark discharge is triggered at distinct phase angles of the entropy oscillation, thus allowing a time resolved-analysis of the thermo-acoustic phenomenon. Estimating the spatial temperature distribution from the measured line integrated inverse speed of sounds requires tomographic reconstruction. A Tikhonov regularized Onion Peeling is employed to deduce radial temperature profiles. To increase the number of independent data, the spark location is radially traversed, which enhances the resolution of the reconstructed temperature field. A phantom study is conducted, which allows the assessment of the capabilities of the reconstruction algorithm. By means of the reconstructed radial entropy field, spatially resolved entropy waves are measured and their amplitudes and phases are extracted. The characteristics of the entropy waves measured in this way correspond well to former studies.

Position of the reaction zone in polyesterification in two phase systems

1979 ◽  
Vol 21 (6) ◽  
pp. 1540-1545 ◽  
Author(s):  
T.V. Kudim ◽  
L.B. Sokolov ◽  
V.S. Naumov ◽  
A.N. Shevchenko
Keyword(s):  
Reaction Zone ◽  
Two Phase ◽  
Phase Systems
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