GRATECAL – Výpočtový nástroj pro numerickou simulaci spalování biomasy na roštu

GRATECAL – Computational Tool for Numerical Simulation of Biomass Grate Combustion

abstrakt

en

The contribution is focused on numerical modelling of grate combustion of solid fuels by means of computational fluid dynamics (CFD) methods. Since results from simulations of grate combustion depend, among others, on the quality of input data including temperature, mass flux and chemical composition of flue gas leaving fuel bed, the attention is turned to modelling of processes, that take place within the fuel bed on the grate. A standalone numerical bed model can be coupled with a CFD model of grate furnace (the so called freeboard), providing for an estimate of boundary conditions at the furnace inlet. The aim is to develop a reliable numerical model of packed-bed combustion. Special emphasis is put on the conservativeness property of the numerical model, i.e. the gas formed during in-bed processes must carry correct amount of mass and energy.

Příspěvek se zabývá popisem výpočtového nástroje GRATECAL pro numerickou simulaci spalování biomasy na roštu experimentálního reaktoru. Specifickým rysem tohoto nástroje je implementace bilanční kontroly systému, která umožňuje analyzovat vliv konvergenčního kriteria na celkovou hmotnostní a energetickou rovnováhu systému.

The contribution is focused on numerical modelling of grate combustion of solid fuels by means of computational fluid dynamics (CFD) methods. Since results from simulations of grate combustion depend, among others, on the quality of input data including temperature, mass flux and chemical composition of flue gas leaving fuel bed, the attention is turned to modelling of processes, that take place within the fuel bed on the grate. A standalone numerical bed model can be coupled with a CFD model of grate furnace (the so called freeboard), providing for an estimate of boundary conditions at the furnace inlet. The aim is to develop a reliable numerical model of packed-bed combustion. Special emphasis is put on the conservativeness property of the numerical model, i.e. the gas formed during in-bed processes must carry correct amount of mass and energy.

GRATECAL, spalování, biomasa, experimentální reaktor, rošt, numerická simulace

GRATECAL, numerical simulation, biomass, combustion, grate, experimental reactor

21.04.2013

The Hague, Netherlands

Proceedings of 9th European Congress of Chemical Engineers

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