超硬材料磨具用烯丙基化酚醛改性双马来酰亚胺树脂的研究

A novel thermosetting resin system for superabrasives based on novolak and bismaleimide （BMI） was developed. The novolak resin was allylated and then copolymerized with BMI. The structure of allyl novolak and reaction mechanism were analyzed by FFIR. Thermal and mechanical properties were characterized by using com- prehensive thermal analyzer （DSC-TG） and strength tester, respectively. The results showed that high molecular weight of novolak was advantageous for heat-resistance, but was unfavorable for the bending strength. High allyl content improved the heat-resistance but lowered the bending strength. When the molecular weight of novolak was 450 and allyl content was 50%, the best resin system with good heat-resistance and bending strength was obtained. It was suitable for the manufacturing of superabrasive tools.     

粗氩冷凝器冰堵故障分析

10000 m3/h空分设备粗氩冷凝器因冰堵无法正常工作,导致整个制氩系统不能投入使用。介绍故障现象和冰堵发生的原因,阐述排除措施和精馏塔等设备在生产、制造及安装环节保持干燥和吹扫的重要性。     

生化污泥在水煤浆气化掺烧中的利用

在混合原料煤中掺入生化污泥与GS-01水煤浆添加剂,于实验室条件下制备了水煤浆。同时,在水煤浆气化工业装置中,研究了生化污泥掺烧对工业试生产的影响。结果表明:于小试中,在混合原料煤中加入添加剂和生化污泥,当后二者质量分数分别为0.48%,低于0.20%时,水煤浆的黏度小于1 200 m Pa·P,流动性与稳定性均较好,含煤质量分数约为60%,满足GB/T 18855—2008标准要求;在工业试生产中,加入生化污泥后,合成气中CO,H_2,CO_2体积分数均略有波动,气化炉粗渣灰分质量分数有小幅变化;随着装置运行时间的延长,灰水的总硬度和钙硬度质量浓度明显提高,总磷质量浓度略有增加。     

门窗缝隙渗透冷空气耗热量计算探讨

在建筑物供暖热负荷计算中，计算公式比较成熟且应用已久，但目前看计算公式中的个别系数取值过时较复杂、设计师在设计中易感困惑。而随着建筑物节能措施的完善新，有必要对其进行讨论。就此对冷风耗热量的计算公式进行分析力尝试定量推导，抛砖引玉、期望业内专家批评指正，门窗缝隙渗入冷空气的耗热量受到重视。在本科教材但目前看计算公式中的个别系数取值过时，而且建筑物受风压和热压综合作用比而随着建筑物节能措施的完善、外窗的缝隙很小就此对冷风耗热量的计算公式进行分析、并对夏季渗透冷负荷以及风压期望业内专家批评指正。