Study On The Co-combustion Of Anthracite And Biomass Char

Under the background of the 13 th five-year plan and supply-side energy reform,Chongqing,as the only municipality in midwest of China,is very important for upgrading the structure of energy consumption,promoting green and clean industries,achieving sustainable development and increasing the use of renewable energy.The anthracite is mainly produced and consumed in Chongqing,but the contents of ash and sulfur are high which limit the combustion performance.Therefore,the anthracite and biomass(Ficus virens)as the experimental sample,the combustion characteristics of anthracite were studied by mixing biomass char and it could provide theoretical basis for practical application.The distribution of coal and the physical and chemical properties and combustion characteristics of typical anthracite in Chongqing area were studied.The anthracite was the most common coal in Chongqing,the reserve and capacity of which was 71.60% and 47.51% in 2017,respectivity.The anthracite had high calorific value because of the high content of carbon and hydrogen,but the high ash and sulfur limited combustion quality.Based on the kinetic model of Coats-Redfern method and microscopic characterization analysis,biomass chars under the effect of pyrolysis temperatures were investigated.The results presented,with the increase of pyrolysis temperature,the activation energy of biomass char increased and its combustion performance became worse that the ignition temperature,peak temperature and burnout temperature rose.Meanwhile,the surface morphology and functional groups of biomass char was destroyed and decomposed,and the microcrystalline structure was more ordered and regular,which contributed to carbon net structure more stable.The blending combustion characteristics of anthracite and biomass char were studied.The results displayed,with the content of biomass char increasing,the ignition temperature,peak temperature and burnout temperature of fuel decreased,activation energy decreased and combustion characteristics became better.The synergism and antagonism were in the process of combustion and the synergism was the strongest at 830 K for the random ratio.When the proportion of anthracite was 50%,it could meet the calorific requirement of power plant.