Determination of parameters of the carbon­containing materials gasification process in the rotary kiln cooler drum

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

The kinetic parameters of the smoke gases purification process from carbon monoxide on a zeolite-based manganese oxide catalyst

“…Carbon monoxide is one of the priority environmental pollutants. On average, gas emissions from petrochemical [1], metallurgical and electrothermal industries in kilns [2] and the authors of [18], the highest conversion of carbon monoxide is provided when using a copper-manganese oxide catalyst 30:70. However, most of the advantages for use have an oxide-manganese catalyst based on clinoptilolite, since it can be obtained from waste sorbents for purification of manganese-containing natural water [18].…”

Kinetics of the process of oxidation of carbon monoxide on a zeolite-based manganese oxide catalyst

“…хімічних і металургійних виробництв можуть містити до 20 % СО [1][2][3]. З екологічної точки зору CO -високотоксичний газ, небезпечний для життя, який призводить до гіпоксії, задухи і раптової смерті [4].…”