Experimental Study On The Reactivity Of Biomass Charcoal Under The Atmosphere Of CO₂

With the consumption of traditional energy and the increasing greenhouse effect, the dual crisis of the energy and the environment are also increasingly serious, so it is to be solved. While, biomass energy is not only renewable, but also the emissions of CO2 is almost zero in the process of circulation, so it is a kind of very good clean energy. Among many ways, the biomass gasification is the one with the most broad prospect in using biomass energy, especially the biomass charcoal CO2 gasification with the greenhouse gases as gasification agent has become one of the current hot research. While, its main problem is the remaining carbon is high and resources are wasted in vain. Besides, the reaction conditions have a great effect on the activity of carbon, and in order to improve its reactivity, we choose biomass charcoal as the research object and CO2 as the gasification agent in this paper, then make them take gasification in the muffle furnace and explore its reaction conditions. The main contents of the study is as follows:(1)We explore the effect of temperature on the reactivity of biomass charcoal under the atmosphere of CO2. Experimental results show that when the initial concentration of CO2 is 29.00%, the conversion of CO2 increases from 52.34% to 100% and the output concentration of CO increases from 15.93% to 31.67% with the temperature increases from 750℃ to 900 ℃. When the temperature is 850 ℃, the conversion of CO2 is as high as 100% and it has no obvious impact on the reactivity of carbon when we add the temperature in this case.(2)We explore the effect of the initial concentration of CO2 on the reactivity of biomass charcoal under the atmosphere of CO2. Experimental results show that the initial concentration of CO2 has a certain effect on the reaction in the same temperature. The output concentration of CO increases from 21.01% to 28.12% with the initial concentration of CO2 changed from 19.66% to 39.66%.(3)We choose charcoal and bamboo charcoal as the research object and then study on the reactivity of biomass charcoal under the atmosphere of CO2. Experimental results show that under the condition that the initial concentration of CO2 is 29.00% and the reaction temperature is 750℃, the charcoal’s output concentration of CO is 15.98% and that of the bamboo charcoal’s is only 4.36%、and the charcoal’s conversion of CO2 is 52.34%, while that of the bamboo charcoal’s is only 13.90%. That is to say the activity of charcoal is better than that of bamboo charcoal.(4)We explore the effect of catalyst on the reactivity of biomass charcoal under the atmosphere of CO2. In this paper, we choose analytically pure K2CO3 and CaCO3 as catalyst. Experimental results show that the output concentration of CO increases from 15.93% to16.85% after we add CaCO3 to charcoal and it will increases to 26.09% when we add K2CO3 under the condition that the initial concentration of CO2 is 29.00% and the temperature is 750℃. It tells us that both of the two catalysts can promote the reactivity, but the catalytic effect of K2CO3 is much better than that of CaCO3.