煤粉浓度对于浓淡燃烧器设计的影响

通过分析传统的煤粉燃烧器设计时一次风管中煤粉浓度与一次风量和一次风速的关系发现，对于低挥发份煤，燃烧器出口的煤粉浓并很难达到着火燃烧所需的最佳浓度，从而提出将煤粉浓度作为一个重要参数在输粉系统及燃烧器设计时予以考虑。提出了新的煤粉浓淡燃烧器设计方法，为输粉系统设计提供了依据

用改进的离散坐标法计算炉内三维辐射传热

采用离散坐标法进行炉内三维辐射传热的计算。在正方体炉膛内验证了该法的精确性，计算结果与区域法进行比较，表明离散坐标法算法可靠，计算工作量小，适合于炉内辐射传热的计算。针对长方体炉膛计算了吸收-发射-散射介质的传热问题，表明传统的离散坐标法不适合计算具有复杂相函数曲线的辐射传热问题，因此采用改进的离散坐标法，并得到了合理的结果。对于煤粉燃烧炉膛将辐射传热问题和炉内流动、燃烧过程耦合起来进行计算，表明离散坐标法是一种很有工程应用价值的炉内辐射传热计算方法

Isolation of Cellulase-producing Fungi and Screening of Highly Efficient Strains

In order to isolate the highly efficient cellulose-degrading strain,a total of 24 fungi isolates were obtained from the decomposing fruit tree branches by using the dilution isolation method,with sodium carboxymethyl cellulose as the sole carbon substrate.Eight fungi strains were found to produce extracellular cellulase.Strains with larger hydrolytic circle/colony diameter in preliminary tests were selected to detect their celluase activities,and the results indicated strain 10 with highest activities.Its filter paper enzyme activity,endonuclease activity and exonuclease activity reached 13.26,36.67 and 12.06 IU respectively.Based on molecular and phylogenetic analyses,the strain was identified as Aspergillus terreus.Next the fermentation conditions through single factor optimizing were improved,and the optimal culture conditions for the three enzymes production were pH=7,the sodium carboxymethyl cellulose content=1.25%,and the sodium nitrate content=1.50%.After optimization,the filter paper enzyme activity,endonuclease activity and exonuclease activity reached 27.80,57.30,29.10 IU,which increased by 109.65%,56.26%,141.29% compared to pre-optimization,respectively.The highly efficient cellulase producing fungus strain 10 was provided for fruit branches fermentation and cellulase industrial development