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Shenhua (SH) demineralized char was employed to determine the relationship between the char conversion ratio and the surface behavior of particles. The amount, distribution and thermal stability of C(O) generated during the combustion process were clarified by temperature-programmed desorption (TPD) and Fourier transform infrared spectroscopy (FTIR). CO2 was the primary gaseous product released during...
In actual combustion facilities, coal chars are often generated using a variety of pyrolysis processes, such as secondary pyrolysis, which is characterized by a longresidence time in high temperature zone. The effects of such processes on the conversion of char N to NO during combustion have seldom been explored. In this study, the releases of NO during the combustion of coal chars obtained from different...
Two typical types of bituminous coal (JN and SH) were employed for thorough devolatilization, then the samples were functionalized by O2 at 1073K to different conversion ratios (JN: 0.21, 0.34, 0.40, 0.53 and 0.63; SH: 0.15, 0.22, 0.32, 0.42 and 0.52) before the surface oxygen containing complexes C(O) were qualitatively and semi-quantitatively characterized by Fourier transform infrared spectroscopy...
Elevated emissions of hydrogen chloride (HCl) from combustion of biomass in utility boilers is a major issue as it can cause corrosion and, in combination with the high alkali content often encountered in these fuels, it can also deposit molten alkali chloride salts on the boiler’s water tubes. Such deposition can impede heat transfer and cause further corrosion. This work torrefied and then burned...
This work contrasted gaseous emissions of carbon, sulfur and nitrogen oxides from combustion of several types of biomass including woody, herbaceous and crop-derived wastes, pulverized in the size range of 75–150μm. Both raw and torrefied biomass were exposed to high heating rates (104–105K/s) in a laboratory-scale electrically-heated drop-tube furnace, operated at 1400K. Combustion occurred under...
A numerical model is developed to investigate the effects of horizontal bias combustion (HBC) and air staging combustion (over-fire air, OFA) technologies on the performance of a 200MWe tangentially-fired pulverized-coal boiler. The devolatilization rate and volatiles amount are determined by a kinetic devolatilization model, which predicts the coal devolatilization prior to the volatile matter and...
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