无油点火燃烧器的数值试验研究

该文对冷态高速煤粉气流在电磁感应无油点火燃烧器内的点火过程进行数值模拟，使用概率密度函数(Probability Density Function)与局部瞬时反应平衡模型模拟气相场的燃烧，采用拉格朗日随机轨道模型模拟颗粒运动轨迹，气相湍流流动采用七k-ε双方程模型，辐射模型采用离散坐标(Discrete．Ordinate)模型。并根据数值试验结果找出不同煤粉浓度对着火温度与着火距离的影响，其结果不但与实验数据较为吻合，而且可以反应出煤粉在无油点火燃烧器内着火方式的变化，对今后的感应式无油点火燃烧器的试验研究以及设计、运行提供理论指导。     

生物柴油的氧化安定性研究

生物柴油是一种由可再生原料如植物油脂等制得的替代柴油用燃料 ,比柴油更易氧化。对生物柴油进行加速氧化 8h ,定时取样分析其氧化油的过氧化值、运动粘度 (40℃)和酸值。考察了氧气流量、金属以及不同原料等情况下生物柴油的氧化速率 ,同时与 0 # 柴油进行比较。结果表明 ,生物柴油随氧气流量改变 ,氧化安定性较好 ,且与 0 # 柴油的变化趋势一致 ;但在有金属如铜存在时 ,生物柴油的氧化安定性下降 ,0 # 柴油则变化不大     

绿色矿山建设实践

为提高能源资源保障能力,转变矿井发展方式,济三煤矿实践了绿色矿山的建设模式。通过树立绿色发展理念、坚持绿色开采、发展循环经济、实施预控管理、创新管理模式、坚持科技创新、坚持品牌建设等方式,形成了现代化绿色矿井的全新形象,提升了矿井的品牌价值。     

Development and validation of an analytical method for the determination of arsenic,cadmium and lead content in powdered infant formula by means of quadrupole Inductively Coupled Plasma Mass Spectrometry

Cadmium (Cd), lead (Pb) and arsenic (As) can enter the food chain through the environment and/or as a consequence of the manufacturing process making foodstuffs the main human exposure route to these chemical elements. The risk associated with this exposure is of such a big concern for human health that the European Food Safety Agency recommends to reduce the exposure to Cd and Pb so as to protect especially vulnerable subgroups of population (e.g., infants). Therefore, the setting of new maximum levels (MLs) for chemical elements in infant formulae (e.g., for Cd) or the reconsideration of the existing ML for Pb is under discussion. On this basis, the availability of analytical methods, precise, accurate and sensitive enough to quantify low concentration values, is a key point especially for official control laboratories that have to state the sample compliance using a fully validated method with an associated uncertainty compliant with the requirements specified in the pertinent regulations. This work describes the development and validation of an analytical method to quantify As, Cd and Pb in powdered infant formulae based on animal protein at values of concentration close to the MLs that are likely to be set. The results obtained make the method suitable for a precise and accurate determination of these chemical elements at these low concentration values. In particular, the results for limit of quantification (LoQ) were respectively (μg kg⁻¹): As 6.2, Cd 1.2 and Pb 4.5. While for the recovery rates the following percentages were obtained: As 105%, Cd 98% and Pb 108%. The expanded uncertainties were found extremely satisfactory (Cd 13% and Pb 19%). The LoQ and the uncertainty for Pb meet the requirements set in Commission Regulation (EC) No. 333/2007 and following amendments being lower than the maximum values allowed. Even for Cd the expanded uncertainty resulted adequate in relation with the low concentration considered.     

小井眼大修工艺在老2-7-18CZ井的应用

江汉油田近几年来针对套损井大力开展51/2"套管内开窗侧钻和悬挂4"套管完井。4"套管内径86mm,在修井过程中存在井眼小、常规井打捞工具及打捞管柱外径尺寸受限,无法完成4"套管内大修作业。老2-7-18CZ井是一口开窗侧钻井,修井过程中在4"套管中出现双鱼顶,通过设计、加工相应的套铣打捞工具,可实现Φ86mm小井眼内的打捞;针对双鱼顶落物在无法打捞情况下,应首先采用磨洗方法处理鱼顶。     

彬长矿区4号煤层煤质特征及洁净等级划分

为实现彬长矿区优质煤炭资源的清洁高效利用,在对彬长矿区以往勘查钻孔的煤质化验资料统计分析的基础上,系统分析了该矿区主采煤层4号煤的煤岩、煤质特征,论述了硫分、灰分、挥发分、发热量和有害微量元素的分布规律,依据最新煤炭资源潜力评价提出的煤炭洁净等级6级划分方案,选用灰分、硫分、有害元素(F、Cl、As及Pb)6个评价指标对矿区内4号煤层的煤炭资源洁净等级进行了初步划分。彬长矿区4号煤层以低硫、低中灰、中高挥发分、特高热值不黏煤为主,局部含小范围的弱黏煤,彬长矿区4号煤层原煤洁净等级为Ⅲ级,属较好洁净煤;浮煤洁净等级为Ⅱ级,属好洁净煤。整个矿区内4号煤层原煤洁净等级以Ⅲ级较好洁净煤为主,分布区占矿区面积的73.03%,仅在矿区西部洪家镇—巨家镇一带和中东部出现小范围的Ⅳ级中等洁净煤分布区,面积占比为26.97%。     

A review of heat pipe systems for heat recovery and renewable energy applications

Advancements into the computational studies have increased the development of heat pipe arrangements, displaying multiphase flow regimes and highlighting the broad scope of the respective technology for utilization in passive and active applications. The purpose of this review is to evaluate current heat pipe systems for heat recovery and renewable applications utility. Basic features and limitations are outlined and theoretical comparisons are drawn with respect to the operating temperature profiles for the reviewed industrial systems. Working fluids are compared on the basis of the figure of merit for the range of temperatures. The review established that standard tubular heat pipe systems present the largest operating temperature range in comparison to other systems and therefore offer viable potential for optimization and integration into renewable energy systems.     

No reference image blurriness assessment with local binary patterns

In this paper, we put forward an effective and efficient no reference image blurriness assessment metric on the basis of local binary pattern (LBP) features. In this proposal, we reveal that part of the LBP histogram bins present monotonously with the degree of blurriness. The proposed method contains the following steps. Firstly, the LBP maps of an input image are extracted with multiple radiuses. And then, the frequency of pattern histogram is analyzed before part of bins are chosen as the features. In addition, we also take the entropy of these bins as another feature. Finally, we learn the extracted features to predict the image blurriness score. Validation of the proposed method is conducted on the blurred images of LIVE-II, CSIQ, TID2008, TID2013, LIVE3D IQA Phase I and LIVE3D IQA Phase II. Experimental results demonstrate that compared with the state-of-the-art image quality assessment (IQA) methods, the proposed algorithm has notable advantage in correlation with subjective perception and computational complexity.     

Pressure transient analysis for asymmetrically fractured wells in dual-permeability organic compound reservoir of hydrogen and carbon

In this paper, a comprehensive semi-analytical model was presented to investigate pressure transient behavior for asymmetrically fractured wells in organic compound reservoir of hydrogen and carbon with dual-permeability behavior. Stehfest inversion algorithm can be used to transform it back into time domain to obtain pressure solution. The presented solution was validated well with numerical solutions. Flow characteristics for asymmetrically fractured wells in dual-permeability organic compound reservoir of hydrogen and carbon were divided into five regime. The effects of some important parameters on dimensionless pressure and its derivative curves were analyzed in details, including inter-porosity flow coefficient from matrix to natural fractures λ, storage coefficient ω, fracture asymmetry factor θ and permeability ratio κ. The presented model can be used to predict production performance and do well test analysis in the development of dual-permeability organic compound reservoir of hydrogen and carbon.     

镁质晶须对油井水泥石力学性能的影响

为提高油井水泥石强度,选用镁质晶须MBW为增强剂,研究了MBW在不同掺量下对水泥浆体的基本性能及水泥石力学性能的影响,并通过XRD、MIP及SEM等表征方法进行了探讨。结果表明,油井水泥中掺入1%~5%的镁质晶须后,其浆体密度及凝结时间基本不变;流动度随晶须掺量的增加而降低,通过加入减阻剂USZ来改善;水泥石的抗压强度、抗折强度随晶须掺量的增加得到明显提高,当晶须掺量为4%时,80℃下水泥石1、3、7和28 d抗压强度比净浆水泥石分别提高8.3%、15.4%、21.5%和18.8%,抗折强度分别提高9.4%、19.4%、13.1%和0.3%。镁质晶须属于惰性微填料,可填充水泥石内部的有害孔隙,增加水泥石密实度,同时作为微纤维,在水泥石内部通过桥连、拔出、剥离、折断等作用机制起到对水泥石增强增韧的双重功效。