Numerical modelling of the co-gasification process with staged feeding of coal and biomass

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Abstract

A two-stage scheme of a coal and biomass co-gasification process is proposed, in which partial combustion of coal produces a high-temperature gasifying agent, which is used for biomass gasification. At the same time, it is possible to reduce thermodynamic losses in the gasification process by reducing the temperature of the gasifier reaction zone due to the high reactivity of biofuels compared to coal. Using a stationary one-dimensional kinetic-thermodynamic model of a two-stage reactor, numerical calculations are carried out with varying the coal-biofuel ratio and specific oxidizer consumption. A special feature of the model is taking into account the recirculation of residual char. The calculation results allow determining the optimal degree of coal replacement with plant biomass according to technological criteria (cold gas efficiency, specific yield of combustible components).

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About the authors

I. G. Donskoy

Melentiev Energy Systems Institute SB RAS

Author for correspondence.
Email: donskoy.chem@mail.ru
Russian Federation, Irkutsk

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Supplementary files

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2. Fig. 1. Scheme of the stepwise process of joint gasification of coal and biomass.

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3. Fig. 2. Stationary profiles of temperature (a), fuel conversion (b) and gas composition (c) for a stoichiometric ratio of 0.3 and a biomass fraction of 0.5 (air blast).

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4. Fig. 3. Dependence of gas composition and yield of combustible components on the conditions of the process of joint gasification of coal and biomass: (a) concentration of CO in the generator gas, vol. %; (b) specific yield of CO, kg/kg(t); (c) concentration of H2 in the generator gas, vol. %; (d) specific yield of H2, kg/kg(t).

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5. Fig. 4. Dependence of the process temperature and fuel conversion on the conditions of joint gasification of coal and biomass: (a) gas temperature after the first stage, K; (b) gas temperature after the second stage, K; (c) degree of coal conversion after the first stage; (d) degree of biomass conversion after the second stage.

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6. Fig. 5. Dependence of chemical efficiency (%) on the conditions of joint gasification of coal and biomass in air blast.

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7. Fig. 6. Dependence of the maximum chemical efficiency on the proportion of biomass and the initial concentration of oxygen in the blast (numbers in the legend, vol. %).

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