Hydrogen Production from a Fluidized‐bed Coal Gasifier with In Situ Fixation of CO₂–Part I: Numerical Model

Abstract

In order to attempt to eliminate global warming effects, it is highly desirable that new technologies with lower or zero emission of CO 2 to the environment are developed. In this work, a high-pressure fluidized-bed coal gasifier for H 2 production with in situ fixation of CO 2 is simulated by a comprehensive two-dimensional model. The Eddy Dissipation Concept (EDC) model is first adopted in the pulverized coal gasification model to simultaneously describe the turbulent mixing and detailed chemical kinetics. The developed model is verified with experimental results. The simulated concentrations for the gas product agree well with the experimental data. The simulated distributions for gas temperature and velocity correlate well with the reaction mechanism and experimental phenomena.

CFD simulation of entrained-flow coal gasification: Coal particle density/sizefraction effects

“…The coarse slag was collected from the outlet of the lock hopper beneath the main gasifier unit, while the fine slag was collected from the fine slag removal filter for the water streams in the quench chamber and the downstream gas scrubber/convective cooler. Previous CFD simulation studies of coal gasification [3,[7][8][9][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] are briefly summarized in Table 1; none of this previous work has simulated variations in particle densities. Our present simulations have focused on the same gasifier geometry, CFD mesh, and chemistry models as in Shi et al [3], but have utilized the ultimate and proximate analysis data for the Pittsburgh #8 seam coal from the Bailey mine that is under study in the current CPP, again at an operating pressure of 2.84 MPa.…”

Thermochemical Equilibrium Model of Synthetic Natural Gas Production from Coal Gasification Using Aspen Plus

“…It is predicted that coal will continue to play an important role in meeting the world's increasing energy demands in the foreseeable future [1]. However, the use of coal faces several challenges such as clean and efficient energy systems, the challenge of carbon storage and sequestration, and the environmental impacts due to the mining [1,2]. The coal gasification in entrained flow reactors with steam and/or oxygen produces synthesis gas (syngas), which is a mixture of mostly hydrogen and carbon monoxide [3].…”