Experimental Investigation Of Oxygen-Rich Combustion Characteristics Of Pulverized Coal

World warming is due to the worse of Greenhouse effect mainly by massive CO₂ emission. Among many Greenhouse gases, CO₂ contributes the biggest to Greenhouse Effect due to its long lifetime and massive emission. CO₂ mainly comes from the combustion of fossil fuels. The amount of CO₂ emission becomes larger, as the development of economics and the demand for energy. In the case of controlling CO₂ emission, various advanced methods should be combined together to fit different cases. The effect of CO₂ could be debated by way of controlling CO₂ production or disposing recovered CO₂.Up to now, many methods have been developed to controlling CO₂ production. The oxygen-enriched combustion technology has been proposed to increase CO₂ concentration. Part of flue gas will be circulated and mixed with oxygen to be loaded into furnace. Oxygen-enriched combustion is also called as O₂/CO₂ combustion, or air separation and flue gas recycle. CO₂ separation and SO₂ treatment become easier, NOx emission is reduced in oxygen-enriched combustion technology. Oxygen-enriched combustion is one of the new clean coal combustion technology that can control pollutant emission.An overview of the main progress of oxygen-enriched combustion technology was given, followed with the comment and criticism of these research achievements and some development of combustion characteristics of pulverized coal. Then, Non-isothermal thermo-gravimetry experiment on four different pulverized coal was conducted in order to research the combustion characteristics of pulverized coal in CO₂ atmosphere with different conditions, especially the igniting and burnout.Secondly, other TG experiments on coal char made in drop tube furnace with different temperature were conducted. We can analysis the reactivity kinetics of char by the results of these experiments. And the results show that the larger of the oxygen content is, the lower of the igniting temperature and the burnout temperature are. Meanwhile we can see that the reactivity of char made in lower temperature is superior than that of char made in higher temperature. In the end, we conducted the gasification experiment of char with different reactivity temperature. And the results show that the higher of gasification temperature is, the higher of the char gasification activity and the gasification activity of shenhua char is higher than that of datong char.