Effect Of Ozone Addition On Coal Combustion Characteristics

Under the general trend of energy conservation and environmental protection,China is trying to optimize the energy structure and energy utilization mode,actively develop new energy and realize the clean and efficient utilization of coal.Ozone oxygen combustion supporting technology can raise the flame temperature,improve the fuel combustion speed and completely and effectively reduce the ignition temperature of fuel.This paper takes Handan anthracite and Mongolian coal as the research object,The effect of ozone atmosphere on coal combustion reaction characteristics was studied.The influence of ozone atmosphere on the combustion characteristics of different kinds of coal was studied by thermogravimetric analysis,and the influencing factors of catalytic effect were discussed.The research shows that the heating rate and ozone concentration of the sample have a great impact on the combustion effect.During the combustion process,with the increase of ozone concentration,the TG curve of pulverized coal combustion moves left,the maximum weight loss rate of DTG curve increases significantly,the ignition temperature of pulverized coal is advanced,the burnout temperature decreases significantly,the ignition is more rapid,the combustion rate is greatly improved,the combustion performance of fuel is greatly improved,and the pulverized coal is easier to ignite and burn out,With the increase of ozone concentration from 2500ppm to 7000ppm,the combustion effect is further improved.Through comparison,it can be concluded that the combustion effect of samples with heating rate of 10K/min is the most obvious.TG-MS technology was used to study the effect of ozone on gas products released during combustion.The research shows that ozone atmosphere improves the generation rate and total amount of CO₂,CO₂is precipitated in advance,so that the whole combustion process can be completed more quickly and efficiently,the content of NO₂in gas products is reduced,the absorption peak of NH₃changes from double peak precipitation to single peak precipitation,and the combustion performance is improved.The influence of ozone on intermediate products was analyzed by solid-phase infrared spectroscopy scanning technology.The FT-IR spectrum of combustion intermediate products and the fitting results of oxygen-containing functional groups in 1700-1000cm^-1band showed that ozone decomposed to produce oxygen atoms at higher temperature,combined with intermolecular hydrogen bonds and free hydroxyl groups,released heat and produced more oxygen-containing functional groups and active groups,which accelerated the combustion and made the sample burn more fully.Flynn wall Ozawa method and DAEM method were used to analyze the kinetics of different kinds of coal in different atmospheres,and the action mechanism was discussed.The results show that the analysis results of the two methods are almost consistent.The activation energy required for coal combustion reaction is relatively high,and the addition of ozone significantly reduces the activation energy required for coal combustion,which has a good effect in the combustion process.There is a kinetic compensation effect between the apparent activation energy and frequency factor of Inner Mongolia lignite in different atmospheres.The experimental conditions have little effect on the kinetic compensation parameters,which can better reflect the reaction process.