| This study,relying on the industry-university-research platform and centering on the biomass pellet fuel production line of shaanxi hancheng new energy co.,LTD.,studied the influence of molding parameters and different additives on the quality of apple tree sawdust molding fuel,providing theoretical basis for preparing high-quality apple tree sawdust briquette fuel.Research contents include:（1）Taking apple tree sawdust biomass fuel of actual production line in hancheng,shaanxi province as the research object,the single-particle compression experiment was carried out on the self-developed KYW-10 biomass briquette fuel multi-parameter control experimental system.The correlation between temperature（80～160℃）,pressure（120～200 MPa）,matrix moisture content（4～12%）and their interaction with relaxation density,radial pressure resistance and energy consumption of compression ratio was systematically analyzed.The results showed that temperature-water content and pressure-water content were significant effects of relaxation density（P<0.05）.Temperature-water content is a significant influence on energy consumption of radial pressure resistance and compression ratio（P<0.05）.Under the condition that the fuel of apple tree sawdust particles meets the national standard RDS≥1 000 kg/m3,the aim is to minimize the energy consumption of compression ratio,and the optimal process parameters determined by response surface method and single factor method are compared:The optimal parameters determined by the response surface experiment were 138.56℃,120.83 MPa,7.61%,corresponding relaxation density was 1163.91 kg/m3,radial resistance pressure was1091.10 N/cm,and compression ratio energy consumption was 41.21 k J/kg.140℃、120 MPa、8%,relaxation density was 1165.22 kg/m3,radial resistance pressure was1093.50 N/cm,and compression ratio energy consumption was 41.21 k J/kg.The optimal parameters determined by single factor experiment were 120℃、140 MPa and 8%,the corresponding relaxation density was 1162 kg/m3,radial resistance pressure was 1089 N/cm,and the energy consumption of compression ratio was 42.70k J/kg.Compared with the optimization parameters obtained by response surface method,the relaxation density and radial resistance pressure were slightly improved,and the energy consumption of compression ratio was decreased by 2.7%.（2）Under the condition of optimized parameters,the effects of 7 different additives on the slagging characteristics of apple tree sawdust were systematically analyzed in combination with the maboiling furnace combustion experiment and XRD phase experiment.The experimental results show that:for NH4H2PO4、CaO、Mg O and three additives,the sinter strength coefficient of the mixed briquette fuel is gradually decreased with the increase of additive content,and then increases after reaching a certain additive ratio.The three additives have a bidirectional effect on the sinter strength coefficient of apple tree sawdust blended fuel,and the best ratio is 3%,12%and 10%respectively.For the two additives Ca（H2PO4）2 and Al2（SO4）3,the appropriate addition ratio can effectively reduce the slagging characteristics of the mixed briquette fuel.Although excessive Ca（H2PO4）2 and Al2（SO4）3 did not significantly change the slagging effect,so the optimal ratio was 2.5%and 6%respectively.Adding a small amount of Si O2 in apple tree sawdust leads to the increase of sinter strength coefficient and more obvious slagging of the hybrid fuel.When the addition ratio is higher than 35%,the slagging characteristics are reduced.Therefore,the best ratio of Si O2 is 35%.Under the optimal ratio of 7 additives,combining economic and environmental friendly indexes,it is determined that CaO is a better additive for apple tree sawdust,and the best ratio of CaO is 12%. |
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