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A comprehensive model accounting for intraparticle heat and mass transport phenomena, primary and secondary reaction processes was developed. Mass loss history, particle surface temperature history, and volatile product distribution of oil shale particles at different pyrolysis temperatures were favorably compared with experimental data. Particle size and reactor temperature would affect temperature...
Oxygen-enriched circulating fluidized bed (CFB) technology is considered as one of the low carbon emission power generation technologies. By recycling the flue gas into the furnace, the CO2 concentration in the exhaust gas can reach over 90%. The coal ignition temperature and ignition characteristics are important factors for boiler design and for choosing the feeding temperature during the transition...
Zhundong coal is one of the most important coals in China due to its huge reserve, but it causes severe fouling and slagging problems when it is burnt in boilers for its high AAEMs (alkali and alkaline earth metal species) contents. Accurately determination of the occurrence modes and contents of AAEMs in Zhundong coals is a necessary step to overcome the ash-related problems. Nowadays, different...
An experimental study on the convection effect on the ignition behavior of single coal particles with size of ∼1.5mm was carried out in an electrically heated vertical tube furnace under various O 2 concentrations and temperatures ranging from 873K to 1123K. Under all test conditions, anthracite particles ignited heterogeneously. However, the ignition mechanism of the bituminous coal particles...
This paper examined the behavior and NO emission of laminar non-premixed methane/air jet flames when subjected to high frequency alternating electric fields of 10kHz over the voltage range of 0–4.0kV. In particular, this paper examined variations of flame shape and luminosity, CO and NO molar fractions in the downstream flue gas, and chemiluminescence from OH ∗ and CH ∗ in the voltage-influenced...
Experimental studies on atomization in an internal-mixing twin-fluid atomizer are reported over a wide range of liquid viscosity, gas supply pressure and Gas to Liquid mass Ratio (GLR). Among all test conditions, the finest sprays were obtained at an axial distance of 150mm and Sauter Mean Diameter (SMD) was dominated by GLR while being nearly independent of viscosity and pressure. However, droplet...
An experimental study was performed to examine the ashing process during straw/coal co-combustion to determine the effect of the blending ratio on ash products. A total of eleven blending samples with coal contents varying from 5wt.% to 90wt.% along with pure wheat straw and pure coal samples were tested to determine the ash fusion points, oxide contents and mineral contents. Blends with coal contents...
The coal ignition temperature in CFB boilers is an important parameter for designing the startup burner and for choosing operating method during the startup process. The combustion of seven different types of coal were measured in a laboratory scale fluidized bed with under-bed preheat system. The study analyzed the effects of particle size, furnace temperature, volatiles content and moisture content...
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