消减空压机气流脉动方法的探讨

根据气流脉动的机理，提出了解决空压机常见的机组枷管过振动问题的一些具体措施。     

活塞式压缩机吸排气管道的振动与控制

阐述了活塞式压缩机吸、排气管道强烈振动的危害，分析了产生共振的原因，介绍了现场消减管道振动的有效措施。     

电子辐照加速器大功率工频高压电源

文章介绍目前两种用于烟气脱硫加速器的不同形式直流高压电源，分析了它们各自的特点。针对它们存在的不足之处，提出了一种全新的倍压型桥式整流线路，并对此线路进行了理论推导和计算机模拟仿真。     

非定常流弯肘型尾水管不规则压力脉动预测

尾水管内螺旋状涡带引起的压力脉动是造成混流式水轮机机组振动的主要原因之一,直接威胁机组的安全运行。为此,提出一种基于CFD数值计算的水轮机尾水管压力脉动数字化预测法,并利用此法对一大型混流式水轮机偏工况下尾水管内水流流动进行了长时间非定常流计算,讨论该工况下尾水管内死水域与涡带的运动规律,预测了尾水管的不规则压力脉动,压力脉动分析结果表明,其波形、频率、相位与实际基本一致。     

强韧包装纸板用落叶松半化学浆的研究

主要研究一种可以替代传统硫酸盐化学木浆，来生产强韧包装纸板或瓦楞纸箱箱板纸的落叶松碱性亚硫酸盐－蒽醌半化学浆。这种采用碱性亚硫酸盐添加蒽醌助剂的制浆方法研制的落叶松半化学浆，当纸浆得率为５６．９％时，在低打浆度情况下纸浆强度性能可以达到我国２号未漂硫酸盐化学木浆的标准，而且有可能达到１号未漂硫酸盐化学木浆的标准，纸浆得率比落叶松硫酸盐木浆得率实际指标（４３％）绝对值提高１３％以上。用于制作强韧包装纸板或瓦楞纸箱箱板纸的落叶松碱性亚硫酸盐－蒽醌半化学浆，蒸煮终点宜于控制在得率约６２％、卡伯值１００左右。     

在矿浆过滤预处理中表面活性剂的应用

针对钼矿的基本物性,筛选合适的表面活性剂,进行钼矿浆过滤条件的试验研究。结果表明,钼矿浆中加入合适的表面活性剂后,增加了滤饼厚度,降低了滤饼湿含量,提高了对矿浆的处理能力。     

Optimising the dewatering behaviour of clay tailings through interfacial chemistry, orthokinetic flocculation and controlled shear

The effect of shear on dewatering behaviour and particle interactions of Na-exchanged smectite and kaolinite clay dispersions has been investigated at pH 7.5, using hydrolysable Ca(II) and Mn(II) ions as coagulants and high molecular weight anionic and non-ionic polyacrylamide (PAM A and PAM N, respectively) and polyethylene oxide (PEO) flocculants. Metal ion addition enhanced the flocculation performance by dramatically reducing the magnitude of the particle zeta potential and, in the case of smectite pulp, suppressing osmotic swelling. Under optimum orthokinetic flocculation conditions of controlled agitation rate and duration, PAM A and PEO-based flocs settled faster than those of PAM N whilst kaolinite pulps produced higher sedimentation rates than smectite pulps. The settling rates are nearly an order of magnitude greater than those observed under standard flocculant-pulp mixing/flocculation methods of inversion and plunging. The difference in the flocculant behaviour is attributed to the more expanded conformation of PAM A and PEO polymer chains in contrast to PAM N, whilst the lower yield stresses, reflecting inter-particle bridging and floc network structure strength that are conducive to faster clarification, were displayed by kaolinite pulps. Following shear, similar consolidation enhancement of ≈ 5-7 wt.% solid for both pulps was achieved at an optimum agitation range of 100-200 rpm. This was accompanied by decreased yield stress in the case of PAM A-based pulps, indicating non-reversible disruption of polymer mediated particle and floc network structure. In contrast, the yield stresses of PAM N and PEO flocculated dispersions indicated similar and stronger particle interactions, respectively, upon consolidation following shear. The findings show clear links between effect of shear, interfacial chemistry and polymer structure on pulp particle interactions and dewaterability.     

基于火焰摄动谱分布的动态燃烧优化

提出基于火馅摄动谱分布特性与火馅微压振动信号的燃烧控制方法，通过分析三层小速分解后的信号平均幅值变化特点可以找到最优燃烧状态。     

GC/MS characterization of effluents front the ozone bleaching of eucalypt kraft pulps

Concerns regarding the possible environmental effects of organochlorine by‐products from bleaching of pulp with chlorine‐based compounds have led to the pulp and paper industry developing new bleaching sequences. Ozone, oxygen and hydrogen peroxide are the main reagents in these Totally Chlorine Free (TCF) bleaching processes.

In this study, eucalypt kraft pulps from a variety of Australian wood sources were subjected to bleaching sequences comprising oxygen, ozone and hydrogen peroxide/alkali extraction stages. The aqueous liquid effluents from each stage were analyzed by GC/MS for aldehydes, ketones, alcohols, carboxylic acids and other by‐products. Pentafluorobenzyl oxime derivatives of the aldehydes and ketones were analyzed by electron impact GC/MS. The major carbonyl compounds detected were formaldehyde, glyoxal, dimethylglyoxal and acetone. An homologous series of n‐aldehydes corresponding to cleavage of ω‐3, 6, 9 and 12 unsaturated fatty acids also was detected. Aromatic aldehydes were identified in the oxygen stage and high consistency ozone stages, but not in any medium consistency ozone or post‐ozone bleach stages. In all stages a series of saturated alkyl carboxylic acids from formic to octacosanoic acid was detected. Formic and acetic acids were present in the highest yield. Only trace quantities of unsaturated fatty acids were detected. Details of these and other compounds detected are discussed.     

未脱墨废人民币纸浆配抄瓦楞原纸

为增加造纸工业的纤维原料来源并充分利用废人民币纸,本文对未脱墨废人民币纸浆配抄瓦楞原纸进行了初步的研究。采用5%氢氧化钠和硫酸溶液对废人民币纸进行化学预处理,再经PFI磨机械疏解后得到未脱墨的废人民币纸浆。采用纤维形态分析仪对未脱墨废人民币纸浆的纤维长度、宽度及其分布进行了分析检测。通过在废新闻纸浆中配加不同比例的未脱墨废人民币纸浆考查瓦楞原纸的质量指标,并对不同的纸浆配比进行分析。结果表明,废人民币纸浆的纤维长度在机械疏解过程中损失较多,只相当于草类原料化学浆的纤维长度。抄造定量为120 g/m2的瓦楞原纸,当废人民币纸浆配比增加时,瓦楞原纸的裂断长和环压指数均下降,废人民币纸浆的配抄比例控制在40%左右时,可以满足D级瓦楞原纸对裂断长和环压指数的要求。虽然废人民币纸浆的成纸强度较低而导致瓦楞原纸的强度指标下降,然而由于其原料价格较低,有利于降低瓦楞原纸的生产成本。