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Oxygen-enriched CFB combustion technology has the combined advantage of producing high CO2 concentration flue gas which is suitable for direct compression and sequestration and allowing excellent fuel flexibility. Due to the nature of oxygen-enriched combustion, the combustion characteristic of fuel in CFB boilers would be significantly different from those in the conventional CFB systems. To accurately...
The pyrolysis characteristics of low quality mixing coal are investigated by thermal analyses,in which the coal is mixed by coal gangue and washed middling coal. The sample is five kinds of mixing materials which their proportion is 1:4, 2:3, 1:1, 3:2, 4:1. The experiment showed that 2:3 coal sample is to achieve best result to the pyrolysis; The pyrolytic characteristic temperatures and the best...
The combustion characteristics of biomass coal oil water slurry (biomass-COWS), containing Fujian anthracite, water hyacinth, heavy oil and dispersant were studied by thermal analysis with TG-DTG method. The results showed that the ignition temperature of biomass-COWS was 20%-24% lower than that of coal, and 15%-24% lower than that of CWS. The ignition temperature and apparent activation energy of...
This paper presents a systematic study of the thermal activation of coal-gangue and factors that influence this process under different conditions. Our samples were tested and analyzed using Differential Thermal Analysis (DTA), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Inductive Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES), Magic Angle Spin Nuclear Magnetic...
A circulating fluidized bed heat-power-gas-tar polygeneration technology has been developed which is based on the property of coal pyrolysis. To study the effect of temperature and coal type on pyrolysis behavior, the pyrolysis process of four different types of coal was investigated by TG-FTIR. The results showed that, at the heating rate of 25°C/min, pyrolysis process could be divided into four...
The treatment of waste tyre is a worldwide interested issue. Some studies show that burning waste tyre seems to be a promising and realistic alternative to attain the conversion of waste tyre into valuable and reusable products. In this paper, the experimental study of combustion characteristics of pulverized coal and waste tyre has been conducted by TG-FTIR. The results obtained show that the great...
The mechanism of sulfur retention by alkali and specific earth metals of corn straw and coal were experimentally investigated using thermogravimetric analyzer (TG) and gas chromatography and mass spectrometer (GC-MS), as well as the effects of different concentration of oxygen on alkali earth metal CaO sulfate. The results show that the existence of alkali metals can catalyze volatile content and...
The carbonation of CaO calcined from a chemical pure CaCO3 in oxy-fuel combustion condition was investigated in a thermo gravimetric analyzer. The influence of temperature and CO2 concentrations on the carbonation of CaO were investigated. It was found that temperature is very important for CaO carbonation reaction. At the range of tested temperatures, higher temperature can accelerate the carbonation...
Experiments were performed in a TGA apparatus to investigate the pyrolysis properties of one kind of anthracite from Leiyang Power Plant, which has been used by several boilers. The effects of pulverized coal particle size, heating rate and final pyrolysis temperature on the volatile release property are presented. Experimental results confirmed that high heating rate could promote the volatile release...
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