Coal and Biomass Energy Laboratory
Thermogravimetric analyses (TGA) were conducted in order to analyze the pyrolysis behaviors of coal and FB. The coal and biomass particles were size classified, using a sieve shaker.
The combustion air (80-90% of required air) is supplied to the boiler burner by a secondary air blower; it is then preheated to 100-200°C, before it enters the boiler through a swirl burner nozzle. A commercial volumetric feeding is used . Primary air transports the fuel suspension into the quarl of the boiler burner. Dual water jets catch particulates and ash, and quench the furnace gases. The entire facility is operated from a central control panel. The diagnostic system consisted of an orifice plate for measuring the secondary airflow and sheathed "type K" and "type S" thermocouples, rotometer to measure the primary airflow rate and emission measurements Lancom and ENERAC systems.
of Energy, Pittsburgh, University Coal Research, "Development
of all-solid-state sensors for Measurement of Nitric Oxide and Ammonia
concentrations by Optical Absorption in Particle-laden Combustion Exhaust
Streams," Annamalai with Luct and Caton
PCGC2 stands for Pulverized Coal Gasification and Combustion Code - Two Dimensional. This code employs the mixture fraction - equilibrium chemistry approach to solve axisymmetric combustion and gasification of coal/coal slurry/oil/gas in a swirl burner. The code consists of many submodels. The comprehensive PCGC2 model/code for pulverized fuel combustion is significantly modified by using three mixture fractions to track primary air, CLB fuel offgas, and vaporized moisture, respectively. Gas-solid phase coupling is handled by PSI-Cell (Particle Source In Cell) method.
A drying model for fuel particles is incorporated into the model/code.
Four major char combustion reactions are considered. Turbulence mean
distributions and emissions of 15 gaseous species (H2, N2, O2, CH4, H2O,
H2S, CO, CO2, NH3, HCN, NO, P4O10, PO2, SO2, and SO3) are calculated
and a fairly good agreement with experimental data is achieved. Parametric
study is carried out to determine effects of excess air, swirl number
and fuel moisture content on combustion behavior and pollutant emissions.
The following physical and chemical modules are used in the current modified
The original code was developed at the Brigham Young University in Utah.
The original code was developed at the Brigham Young University in Utah under a joint effort by the BYU and the University of Utah.
Results (2-mixture vs 3-mixture)
This is from 90:10 coal:coal with BYU input data.