600MW超临界燃煤发电机组节能降耗实践

通过对600MW超临界机组节能潜力的分析,提出了涉及锅炉燃烧及制粉系统、汽轮机及热力系统、辅机系统领域的综合节能改造方案,分析了所采取的节能技术措施效果,具有一定的借鉴意义。     

如何协调工业发展与环境保护

叙述了泸县工业现状,指出泸县面临的环保形势十分严峻,分析了影响全县环境质量的原因,提出了对改善泸县环境质量的建议。     

无缝钢管张力减径过程中内六方的成因分析及解决办法

分析了无缝钢管在张力减径时内六方产生的原因及影响因素,重点分析了温度不均匀对内六方的影响,并结合现有工艺条件提出多种减少直至消除内多边形的措施。     

厚壁钢管张力减径过程的变形规律研究

荒管壁厚和张力系数是张力减径工艺的重要参数,对成品钢管质量具有直接影响。针对20机架钢管张力减径过程建立热力耦合有限元模型,并选择9种不同壁厚的钢管进行数值模拟,得到了张力减径过程中金属的流动规律,研究讨论了钢管内多边形的形成机理,总结了荒管壁厚和张力系数对张力减径工艺的影响规律。     

执行SO2和NOx新排放标准的压力及建议

通过对《火电厂大气污染物排放标准》(GB 13223—2011)污染限值的解读,结合目前燃煤电厂实施脱硫、脱硝工程的近况及实际运行的经验,叙述了燃煤电厂执行二氧化硫和氮氧化物新排放标准所面临的巨大压力,以及加大减排措施的力度、治污设备的技术改造、减排效率的提升等一系列问题。对新排放标准中重点地区二氧化硫的排放浓度小于50mg/m3、氮氧化物的排放浓度小于100mg/m3的限值要求进行了客观分析,提出了若干建议。     

Biological hydrogen production by Anabaena sp. - Yield, energy and CO2 analysis including fermentative biomass recovery

This paper presents laboratory results of biological production of hydrogen by photoautrotophic cyanobacterium Anabaena sp. Additional hydrogen production from residual Cyanobacteria fermentation was achieved by Enterobacter aerogenes bacteria. The authors evaluated the yield of H₂ production, the energy consumption and CO₂ emissions and the technological bottlenecks and possible improvements of the whole energy and CO₂ emission chain.The authors did not attempt to extrapolate the results to an industrial scale, but to highlight the processes that need further optimization.The experiments showed that the production of hydrogen from cyanobacteria Anabaena sp. is technically viable. The hydrogen yield for this case was 0.0114 kgH₂/kg_biomass which had a rough energy consumption of 1538 MJ/MJH₂ and produced 114640 gCO₂/MJH₂. The use of phototrophic residual cyanobacteria as a substrate in a dark-fermentation process increased the hydrogen yield by 8.1% but consumed 12.0% more of energy and produced 12.1% more of CO₂ showing that although the process increased the overall efficiency of hydrogen production it was not a viable energy and CO₂ emission solution. To make cyanobacteria-based biofuel production energy and environmentally relevant, efforts should be made to improve the hydrogen yield to values which are more competitive with glucose yields (0.1 kgH₂/kg_biomass). This could be achieved through the use of electricity with at least 80% of renewables and eliminating the unessential processes (e.g. pre-concentration centrifugation).     

Electropolishing of AISI-304 stainless steel for protection against SRB biofilm

Electropolishing treatment (EP) can be used to remove the biofilm formed on AISI-304 stainless steel surface and protect it against bacterial colonization. High levels of both smoothness and brightness of AISI-304 stainless steel surfaces can be attained by using electropolishing technique, where the sample was fixed as anode and a suitable current was applied into electrolytic cell containing H₃PO₄. AISI-304 stainless steel was exposed to stabilized mixed culture of sulfate reducing bacteria (SMC-SRB) under different conditions as, temperature, pH, salinity, incubation time and inoculum size. The present study recorded the main indicators of bacterial activity such as S⁻⁻, Fe⁺⁺, most probable number (MPN) of SRB and weight loss (corrosion rate) by milinches per year (mpy). The results revealed that the bacterial counts were obviously decreased under all conditions of bacterial biofilm formation after electropolishing treatment.     

Characteristic features of ion-photon emission from yttrium-iron garnets

The main parameters of the ion-photon emission (IPE) arising from the bombardment of yttrium-iron garnets (YIG) samples with Ar⁺-ions were studied. The essential difference in the spectral composition, quantum yield of emissions, and spatial distribution of radiation registered from YIG to that from samples of pure metal iron was determined. Such difference in parameters of IPE is due to contribution of new mechanisms of formation of excited particles leaving the sample during ion bombardment YIG compared with emission from a metal. It was suggested the excited atoms are formed during the decay of Me_mO_n complexes ejected from solids.     

复合硅酸盐水泥与外加剂的适应性研究

为了提高混凝土的性能,目前混凝土施工中经常添加一些外加剂,水泥与外加剂之间的适应性就显得尤为重要。通过实验分析了天业水泥厂生产的32．5复合硅酸盐水泥与三种减水剂NF、FDN以及葡萄糖酸钠的适应性关系,对5min、60min的Marsh时间测定,确定了32．5复合硅酸盐水泥与高效减水剂FDN的相容性较好。     

三辊斜轧过程数值模拟与实验对比分析

使用三辊斜轧空减径设备对管坯进行加工,研究了整个轧制过程中金属的变形与轧机负荷。借助于非线性有限元软件sfFormingGP对斜轧过程进行模拟分析,对比分析了轧制过程中金属变形、受力等参数的合理性。