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Both laboratory simulation experiments and thermodynamic equilibrium calculations were conducted to illustrate the retention mechanisms of ash components on three toxic elements (Sb, Se and Pb). The experiment was carried out in a fluidized bed reactor with the combustion temperature in the range of 500–1000 °C. The results shown that the redistribution behavior of these toxic elements was greatly...
The effect of the ash composition on the redistribution of arsenic in a coal combustion system was determined via both experimental laboratory simulations and thermodynamic equilibrium calculations. The experimental study was performed in a fluidized bed reactor in combustion temperature range of 500–1000°C. The results show that arsenic redistribution is strongly related to the chemical composition...
Particulate matter (PM) sampling was performed on an industrial boiler (3MW) that burned various blends of high-Cl coal and low-Cl coal. Blends with high-Cl coal mass fractions of 30%, 50% and 70% were fired during the sampling. The results showed that both the ultrafine PM yield and its Cl content increased when blends with a higher fraction of high-Cl coal were burned. To clarify the effects of...
The catalytic effects of brine sludge (rich in NaCl), iron mud (rich in Fe2CO3), steel slag (rich in Fe2SiO4 and α-Fe) and calcium carbide residue (rich in Ca(OH)2) on coal combustion were compared with those of pure NaCl and ZnCl2. Thermobalance experiments showed that the catalytic effects of NaCl and brine sludge on coal combustion were better than those of the others. NaCl and brine sludge reduced...
The two-color method is widely used in non-contact temperature measurement of combustion flames from radiation images, traditionally based on the spectroscopic characteristics of the image sensor, and/or the representative wavelengths for the red, green and blue filters of the image-forming devices, for example, Charge Coupled Device (CCD) cameras. In this paper, a new method to derive the temperature...
A full two-fluid model of reacting gas-particle flows with an algebraic unified second-order moment turbulence-chemistry model for the turbulent reaction rate of NO formation are used to simulate swirling coal combustion. The sub-models are the k- -k p two-phase turbulence model, the EBU-Arrhenius volatile and CO combustion model, the six-flux radiation model, coal devolatilization model...
The present work introduces a way of optimizing the low NO x combustion using the neural network and genetic algorithms for pulverized coal burned utility boiler. The NO x emission characteristic of a 600MW capacity boiler operated under different conditions is experimentally investigated and on the basis of experimental results, the artificial neural network is used to describe its...
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