Biomass Coke Adsorption Simulated Flue Gas In SO <sub> 2 </ Sub> / NO Experimental Study Of The Properties

The large quantities of SO2 and NOx emission from the coal-fired power plants of china are the main pollutants in the atmospheric environment, which causes a serious threat to the health and safety of our residents. To address the emission issue from coal-fired power plant, many joint control technologies of desulphurization and denitrification have been applied in China. The activated carbon (char) adsorption technology with high adsorption efficiency and multiple pollutants joint removal characteristics has received extensive attention. Also, biomass resource has the characteristics of abundant reserves, low sulfur and low nitrogen content, and zero net emission of CO2. Therefore, biomass char as a solid adsorbent has great prospects and outstanding environmental characteristics for the solution of coal-fired power plants emission issue.In this paper, five kinds of biomass resources were chosen as raw materials for the study.of industry analysis, elemental analysis, SEM analysis, pore structure analysis, and thermo-gravimetric analysis. The results indicated that:the activation energy obtained by using Coats-Redfern model were between 27.34kJ·mol-1～79.43kJ·mol-1; while the activation energy obtained by using Freeman-Carroll model were between 53.65kJ·mol-1～101.39kJ·mol-1.The biomass chars prepared by the self-made fixed-bed facility were tested for the SEM analysis and pore structure analysis. The results indicated that:1) The volatile content decreased with increasing of the pyrolysis temperature. On the contrary, the ash content and fixed carbon content increased with increasing of pyrolysis temperature. Between 673K-1073K, the biomass char acquisition rate decreased significantly with increasing of pyrolysis temperature. The decending order of biomass char acquisition rate: rice husk> rice straw> corn straw> cotton straw> wheat straw.2) The porosity and the degree of thermal degradation increased with increasing of pyrolysis temperature.3)The pore structure parameters of biomass chars were much greater to biomass raw materials, the biomass chars fast pyrolysed at 873K obtained better pore structure parameters.4) Steam activation can significantly improve the pore structure parameters of biomass chars.The SO2/NO adsorption experiments of biomass chars were carried out in a quartz fixed bed reactor. The results indicated that:1) as the decreasing of particle size, the penetrate time extended and the adsorption volume increased.2) The biomass chars pyrolysed at 873K showed better adsorption performance to other chars.3) the biomass chars pyrolysed with rapid heating rate obtained better adsorption performance to other chars.4) the biomass chars with different raw material type showed distinguished adsorption volume. The decreasing order of SO2 adsorption volume:wheat straw, corn straw, rice straw, rice husk, cotton straw. The decreasing order of NO adsorption volume: wheat straw, rice straw, corn straw, rice husk, cotton straw.5) The SO2/NO adsorption efficiency and adsorption volume of biomass chars decreased with increasing of adsorption temperature.6) SO2 showed better adsorption capacity as NO in individual char adsorption, the presence of SO2 enhanced the effect of NO adsorption, however the adsorption effect of SO2 was weakened.The SO2/NO adsorption experiments of steam activated biomass chars were carried out in a quartz fixed bed reactor. The results indicated that:1) The significant increasing of specific surface area and pore structure parameters of biomass chars after steam activation played the major role in the improvement of the SO2/NO adsorption performance.2) After steam activation, the biomass chars pyrolysed at 873K still obtained better adsorption performance to other chars.3) After steam activation, the biomass chars pyrolysed with rapid heating rate still obtained better adsorption performance to other chars.4) 1073K was supposed to be the optimal activation temperature for biomass chars with the maximum adsorption volume.5) The steam activated wheat straw chars showed better adsorption performance to the steam activated rice husk chars.6) As the reduction of the SO2 and NO concentration, the penetrate time extended, but caused obvious decreasing of adsorption volume.