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Helical coils have gained increasingly interest in the field of supercritical carbon dioxide (SCCO2) Rankine cycles during the last decade due to the compact structure and high heat transfer rate. Past studies mainly focused on effects of operating conditions and the gravitational buoyancy, and are not sufficient to fully understand the behavior of SCCO2 helically coiled gas heaters. Influence of...
Based on chemical equilibrium assumption, a comprehensive three-dimensional numerical model was developed for a GSP gasifier. The Euler–Lagrange approach was applied to describe the multiphase flow in the reactor. The mixture fractions were used to describe the thermochemistry. The probability density function (PDF) of β-function was used to model the turbulence–chemistry interaction. The stochastic...
A kinetic model of hydropyrolysis was developed based on the Chemical Percolation Devolatilization (CPD) network devolatilization model, considering the hydrogenation reactions of active species and fragments produced during the decomposition of the coal structure with hydrogen. Light gas compositions were calculated and the yields of oxygen-containing species were corrected. The calculation results...
A slag flow and heat transfer model coupled with a particle capture sub-model and 3-D gasifier model was developed to describe the slag characteristics and gasification process in entrained flow gasifier. A criterion for particle capture was used to evaluate the interaction of particles colliding with the wall. Two kinds of gasifiers were simulated using the developed model: the membrane wall gasifier...
In entrained flow gasifiers, crystallization inside the liquid slag can increase the viscosity of the slag, affecting flow down the wall and resulting in operational challenges. Chemical composition of the slag is an intrinsic factor of crystallization characteristics. In the study reported here, five synthetic slags with different SiO 2 /Al 2 O 3 (S/A) ratios from 0.5 to 4...
In slagging gasifiers, the crystallization ratio and crystal morphology are of great importance to fluidity of slag. Although increasing attention has been paid to the influence of crystallization on viscosity, few studies have investigated crystallization kinetics in slag melts due to challenges associated with high temperature and experimental complexity. In order to gain an understanding of crystallization...
To separate Mycobacterium abscessus subsp. bolletii from Mycobacterium abscessus subsp. abscessus using species identification, and to investigate the in vitro activity of amikacin, cefoxitin, imipenem, levofloxacin, moxifloxacin, clarithromycin, azithromycin, and linezolid against Mycobacterium abscessus.Seventy M. abscessus isolates, previously identified by 16S rRNA sequencing, were further identified...
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