水样中亚铁及总铁含量连续测定方法探讨

文章研究了在同一样品溶液中连续测定亚铁和总铁的分析方法,对同一标准样品溶液和实际样品进行了单独测定亚铁和总铁含量的实验,同时在完成亚铁含量测定后加入试剂,进行了总铁含量的连续测定,并对实验数据进行相对误差分析。结果表明:单独和连续测定的总铁含量数据无显著性差异,方法切实可行。     

离子色谱法测定萤石中氟化钙的含量

应用离子色谱法(ICS)测定萤石中氟化钙的含量。试样经氢氧化钾熔解,定容进行测定。同时进行了熔解试剂时测定结果的影响试验,并进行了一系列仪器测定精度及方法回收率试验。经过试验发现离子色谱法测定萤石中的氟化钙含量具有分析速度快、无干扰、灵敏度高、准确度高等优点,适合于大批量样品的检测,可以大大地提高工作效率。     

控温箱-热流计法测定保温材料导热系数的实验方法

采用控温箱-热流计法对保温材料的导热系数进行实验测定。详细介绍了该实验装置的操作过程、测定原理、测定技术以及遇到的具体问题和解决方法,并进行了误差分析。     

准确测定水样耗氧量的条件探讨

耗氧量测定的反应条件要求苛刻,对水样进行准确测定要具有丰富的经验,本文就水浴温度、加热时间、滴定温度、纯水空白等对样品测定结果的影响进行了探讨,总结了准确测定水样耗氧量的一些经验.     

钢铁中硅含量测定方法的研究

采用还原型硅钼酸盐光度法对钢铁中硅含量进行了实验测定,根据测定原理,介绍了试料分解和试液制备的方法,并对最低检出限、精密度、准确度进行了分析,指出实验测定值均在标准样品保证值范围内。     

钢铁中锰含量测定方法的研究

采用高碘酸钠(钾)分光度法,对钢铁中锰含量进行了测定,介绍了实验原理、所用仪器与试剂,并对试液制备、空白值测定、最低检出限测定等实验过程进行了阐述分析,指出利用该方法测定钢铁中锰含量具有操作简便、灵敏度高、精密度好等优点。     

气体湿度对燃气热值测定的影响

本文就水流式热量计测定不同燃气热值时，空气湿度对测定值的影响进行了实验研究，得出空气相对湿度与热值测定值的线性关系，并进行了理论分析。     

连续流动注射分析法测定生活饮用水中的挥发酚

传统方法测定生活饮用水中的挥发酚,操作过程复杂,效率极低,采用连续流动注射分析法可快速准确地进行测定。文章对连续流动注射分析方法的线性范围、精密度、准确度进行了测定,结果与传统方法测量结果相近,符合要求,可用于生活饮用水中挥发酚含量的测定。     

火花直读光谱法测定铝及铝合金中的钒含量

通过对测定条件的优化,采用高钒系列标准样品建立分析程序,完成类型标准化,校验后再进行测定,建立了火花直读光谱法对铝及铝合金中的钒含量进行测定的方法。选用E2235高钒标准样品进行标准化,所得测定值与标准值基本一致,相对标准偏差为2.9%(n=8)。结果表明,当测定元素含量不超过0.020%时,方法准确、可靠,适合于铝及铝合金中微量钒含量的测定。     

水质检验中测量不确定度的评定

在对检验全过程进行分析的基础上,对饮用水水质检验中有代表性的项目进行了不确定度评定,包括溶解性总固体测定(重量法)、氯化物测定(滴定法)和水中铁的测定(仪器分析)。找出了影响测定结果不确定度的主要因素:仪器、玻璃计量器皿、标准溶液、校准曲线等。     

柴油蓄热催化裂解制气技术的试验

针对重油制气存在问题,提出用柴油作为蓄热催化裂解的制气原料。生产表明柴油制气技术完全可行,而且产气率和产气量较重油制气大幅度提高,生产成本下降,污染得以缓解。     

Thermodynamic analysis of compression ignition engine using neat Karanja oil under varying compression ratio

Exergy analysis method has been widely used to evaluate the energy utilisation efficiency and potential of waste heat energy. The objective of the present investigation is to analyse the exergy efficiency, destruction of exergy, mean gas temperature, exhaust temperature, brake thermal efficiency and brake-specific fuel consumption of a single cylinder diesel engine using diesel and neat Karanja oil blends at different compression ratios (CRs) at full load and at different loads with a CR of 18. It is observed that 10% neat Karanja oil blend (K10) shows similar performance to diesel and better than 20% neat Karanja oil blend (K20). But K20 shows better performance at a CR of 18 as compared to 16. At higher loads, exergy efficiency and destruction of exergy are found more at a CR of 18 for all fuels. Destruction of exergy decreases and exergy efficiency increases at CR 18.     

油罐沸溢火灾前期特性的实验研究

研究设计了一套油罐火灾模拟实验装置,对具有水垫层的重柴油和0#柴油储罐火灾的前期燃烧特性进行了模拟实验研究。分析了油罐火灾燃烧发展阶段、燃烧火焰的温度变化、油品燃烧速度以及火焰高度变化的特点。探讨了油品种类、油罐直径和油品液面高度对油品燃烧速度的影响以及风速对火焰倾角的影响。     

柴油-天然气双燃料汽车技术研究

研究了柴油－天然气双燃料汽车的技术优势和改装方式,设计开发了柴油－天然气双燃料系统,进行了大量的试验和研究,改装了槽车和大客车逾20辆,改装效果良好,给用户带来了显著的经济效益。     

Performance and emission characteristics of a diesel engine fuelled by neem oil blended with alcohols

Fuel crisis and environmental concerns have led researchers to look for alternative fuels of bio-origin sources such as vegetable oils, which can be produced from forests and oil-bearing biomass materials. Vegetable oils have energy content comparable to that of diesel fuel. Straight vegetable oils posed several operational problems and durability problems when subjected to long-term usage in compression ignition engine. These problems are attributed to higher viscosity and lower volatility. In this study, performance and emission parameters of a diesel engine operating on neem oil and its blends of 5, 10, 15 and 20?vol% with ethanol, 1-propanol, 1-butanol and 1-pentanol are evaluated and compared with diesel operation. The results indicate that the brake thermal efficiency is improved with the use of neem oil–alcohol blends with respect to those of neat neem oil. The smoke intensity, CO and HC emissions with neem oil–alcohol blends are observed to be lower with respect to those of neat neem oil at higher loads. The NO _x emission is very slightly reduced with the use of neem oil–alcohol blends except for the neem oil–ethanol blend compared with that of neat neem oil.     

锅炉房自动喷水灭火系统设计参数

回顾了我国消防规范关于柴油发电机房和燃油燃气锅炉房消防系统设置的历史沿革，分析了这些场所的火灾危险性和起火原因，提出了火灾预防措施，根据国内外规范关于柴油发电机房和燃油燃气锅炉房自动喷水灭火系统的设计参数，提出了既经济又适合国情的自动喷水灭火系统设计参数。     

干式煤气柜密封油油质在线改善技术的探索与应用

钢铁企业利用稀油密封干式煤气柜储存焦炉煤气时,受焦炉煤气净化工艺和组分的影响,普遍遇到密封油技术性能下降较快、使用寿命较短且影响气柜安全运行的问题,文章针对影响密封油技术性能指标变化的原因做了分析,并在生产工艺不变的条件下,利用在线改质技术,完成了对密封油技术性能的改善,为稀油密封气柜探索出了一条无需停产就可改善在用密封油性能指标的有效途径。     

Performance and emission characteristics of biodiesel derived from coconut acid oil

ABSTRACT

In order to maintain economic development and reduce global warming and prices of the oil, there is an increase in the research and development of alternate energy resources. Normally, the vehicles running in pure diesel is found to produce more emission than biodiesel-blended engine vehicles. So, we used coconut acid oil, which can reduce the emission. In this paper, coconut acid oil blended with diesel in various proportions such as B5 (5% biodiesel, 95% diesel), B10 and B20 have been used at different load conditions in 4-strokes single-cylinder diesel engine mounted on an eddy current dynamometer bed. Physical properties of coconut acid oil such as density, viscosity and calorific value have been determined before engine testing. Hence, suitable blends are selected for blending with coconut acid oil in the diesel engine. The overall performance increase with the biodiesel blends is about 0.93% and emission has decreased by about 3.47%.     

民用建筑发电机房油系统设计探讨

对柴油的物理特性、日用油箱的容积计算及修订版《高层民用建筑设计防火规范》相关条款进行了分析。     

洗油替代工业萘合成高效减水剂的工艺研究

研究用洗油代替部分工业萘合成高效减水剂的工艺。研究了磺化反应、缩合反应及洗油替代量对产品性能的影响。结果表明。洗油替代量30％、在160℃下磺化2．5h、缩合4．5h条件下,可得到与萘系减水剂（NF）性能相当但减水率略高、早期强度高且成本较低的NF30高效减水剂。在原料中加入氧化剂MO可以减少反应中酸性气体的排放。