Effect Of Biomass Components On Characteristic Of Biomass And Coal Co-Combustion And Pollution Emission

Under the double pressure of energy shortage and environmental pollution, it is very necessary to develop a new renewable energy. At present, there are many ways to utilize biomass energy, of which biomass and coal co-combustion is an effective method to reduce the emission and improve the utilization ratio of biomass. In this paper, the research focused on biomass components, TG-DTA analyzer and tube furnace were used to research characteristic of biomass and coal co-combustion and pollution emission, respectively.Firstly, GB/T 2667.10-1995 method for determination of holocellulose in paper-making material, nitric acid-ethanol method and sulfuric acid method were used to determine the content of biomass components in corn stalk, rice straw, rice shell and sawdust. The results show the holocellulose content are all much higher than lignin content in the four samples, and sawdust has the highest content of cellulose and lignin, while the most content of semicelllose is corn straw. TG-DTA analyzer was used to study the effect of biomass components on biomass and coal co-combustion characteristic, the results show: ignition temperature decreases 140℃when the content of corn straw increases from 0% to 100%; the higher cellulose content in biomass, the more weight lost, the volatile combustion more intensely; the higher lignin content, the less weight lost, the coke combustion more intensely; The volatile combustion is most part of semicellulose combustion, it can improve both the volatile combustion and coke combustion, but the degree of combustion is weaker than cellulose or lignin.The batch experiments of tube furnace were used to study the effect of biomass components on biomass and coal co-combustion pollution emission characteristic. The results show that when the content of corn stalk increases, the release of NO doesn't show obvious regularity, and the release of SO2 increases. When the combustion temperature increases from 700℃to 900℃, the total concentration and the conversion ratio of NO and SO2 are improved. Through the experiments analyse, the results show that: the release of NO in the three biomass components, the most one is xylan, the next one is cellulose,and the least one is lignin; the most emission of SO2 is lignin, the smallest one is xylan, and cellulose has no SO2 emission.Biomass and coal co-combustion kinetic model was set up, and based on grey theory, some effect factors of co-combustion pollution emission were analyzed, and the primary and secondary relation of factors was established.