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Equilibrium calculations of NO reduction and kinetic calculations of the combustion of biomass fuels in grate firing

Technical Report:

Abstract

The objective of this investigation has been to compare theoretical calculations with experimental results from the combustion of biomass fuels in a laboratory fixed bed furnace. The two computer codes used were Fluent and a program for thermochemical equilibrium calculations. In addition to this some experiments were carried out with the addition of NO to the primary combustion air, to examine the ability of using the fixed bed combustion of biomass fuels for reduction of the amount of NO in combustion gases from diesel engines. 1000 ppm NO was added to the primary air during the combustion of coniferous and birchwood chips, soft wood blocks and bark/wood chips pellets. The reduction of the amount of NO varied between 65 and 98 percent for a bed region stoichiometry of 0.45-0.72 and between 31 and 65 percent for a bed region stoichiometry of 1.41-1.51. According to the thermochemical calculations the reduction could be complete at bed region stoichiometries below 1.00, if the reaction time is allowed to be long enough. The formation of NO during the combustion of biomass fuel reach thermochemical equilibrium if the combustion temperature is enough. During the combustion of bark/wood chips pellets the combustion temperature was 1100-1200 deg  More>>
Authors:
Olanders, B [1] 
  1. Chalmers Univ. of Technology and Univ. of Gothenburg (Sweden). Dept. of Inorganic Chemistry
Publication Date:
Dec 31, 1992
Product Type:
Technical Report
Report Number:
NUTEK-FBT-92-13; CTH-OOK-92-04
Reference Number:
SCA: 092000; 098000; PA: SWD-92:007252; SN: 93000918331
Resource Relation:
Other Information: PBD: 1992
Subject:
09 BIOMASS FUELS; WOOD FUELS; COMBUSTION; MATHEMATICAL MODELS; COMBUSTION KINETICS; BENCH-SCALE EXPERIMENTS; WOOD BURNING FURNACES; DENITRIFICATION; NITRIC OXIDE; BIOMASS; F CODES; AIR POLLUTION CONTROL; EXPERIMENTAL DATA; 092000; 098000; WASTE MANAGEMENT
OSTI ID:
10113730
Research Organizations:
Swedish National Board for Industrial and Technical Development (NUTEK), Stockholm (Sweden); Chalmers Univ. of Technology and Univ. of Goeteborg, Goeteborg (Sweden). Dept. of Inorganic Chemistry
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ON: DE93753020; CNN: Project NUTEK-276-374; TRN: SE9207252
Availability:
OSTI; NTIS
Submitting Site:
SWD
Size:
30 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Olanders, B. Equilibrium calculations of NO reduction and kinetic calculations of the combustion of biomass fuels in grate firing. Sweden: N. p., 1992. Web.
Olanders, B. Equilibrium calculations of NO reduction and kinetic calculations of the combustion of biomass fuels in grate firing. Sweden.
Olanders, B. 1992. "Equilibrium calculations of NO reduction and kinetic calculations of the combustion of biomass fuels in grate firing." Sweden.
@misc{etde_10113730,
title = {Equilibrium calculations of NO reduction and kinetic calculations of the combustion of biomass fuels in grate firing}
author = {Olanders, B}
abstractNote = {The objective of this investigation has been to compare theoretical calculations with experimental results from the combustion of biomass fuels in a laboratory fixed bed furnace. The two computer codes used were Fluent and a program for thermochemical equilibrium calculations. In addition to this some experiments were carried out with the addition of NO to the primary combustion air, to examine the ability of using the fixed bed combustion of biomass fuels for reduction of the amount of NO in combustion gases from diesel engines. 1000 ppm NO was added to the primary air during the combustion of coniferous and birchwood chips, soft wood blocks and bark/wood chips pellets. The reduction of the amount of NO varied between 65 and 98 percent for a bed region stoichiometry of 0.45-0.72 and between 31 and 65 percent for a bed region stoichiometry of 1.41-1.51. According to the thermochemical calculations the reduction could be complete at bed region stoichiometries below 1.00, if the reaction time is allowed to be long enough. The formation of NO during the combustion of biomass fuel reach thermochemical equilibrium if the combustion temperature is enough. During the combustion of bark/wood chips pellets the combustion temperature was 1100-1200 deg C, which is high enough for the equilibrium to be reached, while when the temperature is between 1000-1100 deg C, as during the combustion of straw pellets, the reaction goes to slow for the equilibrium to be attained. The computer code FLUENT has mainly been used for fluid dynamic calculations, but can also be used for simple kinetic modelling. The calculations give a good picture of the distribution of temperature, velocity and gas components over the cross section of the laboratory fixed bed furnace. 8 refs., 9 figs., 4 tabs.}
place = {Sweden}
year = {1992}
month = {Dec}
}