晋牛矿1303综放面采空区注氮方案研究及数值模拟

为了合理设计采空区注氮防灭火方案,以晋牛煤矿1303综放工作面为研究对象,通过在采空区进、回风侧布置束管监测系统,连续测定采空区气体浓度变化,划分采空区自燃“三带”分布区域,并基于采空区自燃“三带”划分标准和数值模拟的方法,利用流体力学COMSOL计算软件,研究不同注氮量、注氮位置下采空区氧化自燃带的分布规律。研究结果表明:注氮量和注氮位置参数的变化,对氧化自燃带上界限的影响并不显著,而对氧化自燃带的下界限影响比较显著;最合适的注氮位置应该在距离切顶线30 m左右,运用Origin软件得出注氮量与氧化自燃带宽度呈指数关系,由拟合式计算出最优注氮量为386 m3/h,此时氧化自燃带的宽度为31.5 m。     

Fractionation of plutonium in environmental and bio-shielding concrete samples using dynamic sequential extraction

Fractionation of plutonium isotopes (²³⁸Pu, ^239,240Pu) in environmental samples (i.e. soil and sediment) and bio-shielding concrete from decommissioning of nuclear reactor were carried out by dynamic sequential extraction using an on-line sequential injection (SI) system combined with a specially designed extraction column. Plutonium in the fractions from the sequential extraction was separated by ion exchange chromatography and measured using alpha spectrometry. The analytical results show a higher mobility of plutonium in bio-shielding concrete, which means attention should be paid to the treatment and disposal of nuclear waste from decommissioning.     

浅析XLDM型脉冲袋式除尘器在CFB锅炉上的应用

介绍了兖矿国宏化工公司2台160 t/h CFB锅炉配套XLDM-5700型袋式除尘器的实际运行情况,从除尘效率、喷吹方式、运行能耗等方面分析了袋式除尘器的性能,并总结出XLDM型袋式除尘器最佳运行方式。     

AA3流动注射仪快速测定地表水中的总氰化物

在反复实验的基础上建立了运用Bran+Luebbe AutoAnalyzer 3流动注射分析仪快速测定地表水中总氰化物的分析方法。结果表明,该方法与传统的分光光度法相比,具有自动进样、分析速度快、测定成本低等优点。与经典的分析方法相对照,结果无显著性差异,能够满足大批量地表水监测的要求。在测试系统中引入了恒温槽,进一步提高了测试的精密度和准确度。     

微波联合消解流动注射光度法测定水中总氮和总磷

利用微波联合消解水样,采用流动注射分析技术,建立了在线测定水中总氮和总磷的快速分析方法.优化了试验条件,在线性范围内,总氮和总磷的工作曲线线性关系良好,检出限分别为0.03 mg/L和0.01 mg/L,相对标准偏差分别为1.5%和1.2%,加标回收率分别为96.7%～103%和98.8%～102%.     

FS—IV^＋流动注射仪测定地表水中氨氮

铵与碱性酚和次氯酸钠反应生成靛蓝化合物,其色度与铵的浓度成正比,亚硝基氰化物使蓝色增强,在660nm处测量吸光度值;采用Flow Solution-IV^＋（FS-IV^＋）流动注射仪测定地表水中氨氮,检测范围0～10．00mg／L,检出限0．008mg／L,分析速率51个样S／h;对方法精密度、准确度、加标回收进行了实验,结果令人满意。该方法具有自动进样、分析速率快、试剂耗量低等优点,可应用于大批量常规地表水分析。     

稠油热采系统综合能耗监测方法及评价

针对目前稠油热采系统节能措施和节能产品对某一环节单个节能产品的节能效果进行检测、评价的现状,提出了将稠油热采系统作为一个整体,采取组合节能措施及产品,给出了稠油热采系统的能耗监测流程、监测要求、程序与方法、数据分析评价方法等。形成了稠油热采系统综合能耗监测数据分析及效果评价方法。     

流动注射法测定水中阴离子表面活性剂的探讨

本文采用流动注射分析技术在线测定水中阴离子表面活性剂,使用的仪器为德国BRAN＋LUEBBE公司自动分析仪。方法在0.050～0.400mg/L范围内,可以获得较好的线性方程,相关系数〉0.9990,检出限为0.015mg/L,水样的回收率在92%～109%,此方法符合水质测定阴离子表面活性剂的要求。并对影响阴离子表面活性剂测定的因素进行探讨。     

微波消解-流动注射分光光度法测定土壤中的总磷

采用热效率高的微波消解系统对土壤中的总磷进行消解,建立了微波消解-流动注射分光光度法测定土壤中总磷的方法,该方法对比HJ632-2011碱熔-钼锑抗分光光度法具有快速、简便、节约试剂等特点。本文用两种分析方法对实际土壤样品及标准样品进行定量测定,所得结果表明微波消解法能快速测定大量土壤样品的总磷。     

Comparative study on effect of blending,thermal barrier coating (LHR) and injector nozzle geometry on biodiesel-fuelled engines

Increased petroleum prices, increased threat to the environment from exhaust emissions and global warming have generated intense international interest in developing renewable and alternative non-petroleum fuels for internal combustion engines. Evolving suitable technology for addressing energy crisis creates a continued investigation into the search for sustainable and clean-burning renewable fuels. This work investigates suitability of different non-edible-derived biodiesels such as cotton seed oil methyl ester (COME), Honne oil methyl ester (HnOME) and Rubber seed oil methyl ester (RuOME) to four stroke, single cylinder compression ignition (CI) engine. Engine tests were conducted to study the effect of fuel blending, thermal barrier coating (TBC) or Low Heat Rejection (LHR) and injector nozzle geometry on the performance, combustion and emission characteristics of COME, HnOME and RuOME in the modified CI engine. Blends of biodiesels with diesel were varied from 20 to 80% in steps of 20%. Two thermal barrier coatings of partially stabilized zirconium (PSZ) and aluminium oxide (Al₂O₃) were provided on the engine to make it fully adiabatic. Nozzle injectors of 3, 4 and 5 holes, with size of orifice varied from 0.2 to 0.3 mm size were selected for the study. It was concluded that B20 biodiesel blend, PSZ-coated engine and four hole nozzle injector of 0.2 mm size resulted in overall better engine performance with increased brake thermal efficiency (BTE) and reduced HC, CO, smoke emissions for the fuel combinations tested. Combustion analysis to study the effect of biodiesel blends, LHR coatings, injector nozzle geometry on the performance of the biodiesel-fuelled engine has been presented to give more insight into the behaviour of operation.