Abstract
An assessment of the feasibility of using the existing equipment of a rotary kiln cooler drum for heat treatment of a carbon-containing filler to produce synthesis gas using production waste in the form of a dust fraction of heat-treated petroleum coke or anthracite is carried out. A mathematical model of the process of gasification of carbon particles is formulated in the continuous-discrete formulation, including thirteen global reactions, of which four are heterogeneous and nine are homogeneous. A numerical model of gasification of a dust fraction of a carbon-containing filler in the rotary kiln cooler drum in the axisymmetric formulation is developed. The convergence of the numerical solution of the gasification problem by the grid step is investigated. It is found that the computational grid, which includes 73,620 cells and 75,202 nodes, leads to an error in determining the main parameters of the model of no more than 1–2 %. Verification of the developed numerical model is performed. It is found that the difference between the molar fractions of CO and H 2 , the values of which were obtained by various software products (Fluent, NASA CEA), is in the range of (2.8...5.8) %. Using the developed numerical model of the process of gasification of a carbon-containing filler in the rotary kiln cooler drum, the quantitative composition of the combustible components of the syngas for different initial parameters is determined. It is found that with the ratio О 2 /С=(42.7...51.6) %, the predicted quantitative composition of the combustible gases of synthesis gas in molar fractions is СО=(32.8...36.9 )%, Н 2 =(17.1...18.4) % and CH 4 =(0.03...0.16) %. The possibility of using the NASA CEA program, intended for operational calculations of equilibrium chemistry, for engineering calculations of the material composition of synthesis gas of industrial furnace equipment, is shown
Highlights
The significant cost of natural gas, as well as the need to comply with stringent environmental safety requirements of industrial enterprises, causes the transition of the energy sector and other industries to an increase in the use of solid fuel with its preliminary gasification
Gasification is known to be a process that involves the use of heat and water vapor to convert carbon-containing materials to syngas, which includes combustible gases such as carbon monoxide, hydrogen and methane
It is shown that the obtained dependences of these parameters are consistent with published data, which confirms the applicability of the Euler-Granular Multiphase formulation for modeling the processes of coal gasification in a circulating fluidized bed gasifier
Summary
The significant cost of natural gas, as well as the need to comply with stringent environmental safety requirements of industrial enterprises, causes the transition of the energy sector and other industries to an increase in the use of solid fuel with its preliminary gasification. This, in turn, led to the appearance of a large number of developments of reactor equipment for gasification and research of gasification of solid fuels and biomass, in particular, by numerical methods of computational hydrodynamics [1,2,3,4,5,6,7,8,9,10,11,12,13]. These works do not consider the use of existing industrial furnace equipment for solid fuel gasification processes. 4/8 ( 106 ) 2020 gasification of carbon-containing materials in various industries using existing equipment is an urgent task and requires careful justification
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