冲击映像法及其在超长距离顶管施工泥浆套检测中的应用

泥浆减阻是超长距离顶管施工中的一项关键技术,泥浆套厚度与工程质量息息相关。基于冲击映像法的基本原理,提出一种精确掌握顶管施工注浆充盈状况的快速检测方法,并通过模型试验和现场试验对检测方法的有效性进行研究。根据模型试验结果,将归一化冲击响应强度作为反映泥浆充盈状况的评价指标,成功应用于苏州一大型引水工程中。研究表明：较传统压力观测法,冲击映像法在检测泥浆套厚度方面有明显的优越性,有效提高了检测效率和高阻力区的识别能力,据此对泥浆薄弱区进行定点补浆,节约了施工成本,可在同类工程中推广使用。     

220t／h水煤浆锅炉出力下降原因分析

为了解决220t／h水煤浆锅炉长期运行后出力下降的问题,进行燃料特性、配风及送风量、炉膛温度场分布、尾部排烟参数等方面的测量及分析,提出2台锅炉检修及运行方面的改进建议。     

刍清洗过滤器在电石渣脱硫剂生产中的应用

电石渣浆中颗粒组成复杂,其中的大颗粒对脱硫系统产生磨损、堵塞等问题。电石渣浆自清洗过滤器能同时控制电石渣浆中颗粒细度和总固含量双重指标,使过滤处理后的电石渣浆变成合格脱硫剂产品。     

湍动浆态床流体力学研究(Ⅳ)带垂直列管束的浆态床流体力学模型与模拟

工业浆态床反应器一般都安装有密集的换热列管,列管束的存在使得速度和气含率的径向分布趋于陡峭,形成“烟囱效应”,目前对此还缺乏合适的流体力学模型进行定量描述.本文提出两点新思路以解决列管束的模拟问题:一是将密集列管束的影响作为体积源项而不是边界条件来考虑,在标准k-ε方程中增加与列管阻力相关的动量源、湍动源、耗散源本构关...     

水煤浆锅炉应用与节能减排分析

从节能减排方面,与传统的链条炉进行了对比分析,发现煤炭使用水煤浆锅炉的综合效率高,节能效果明显。以4t／h的水煤浆锅炉代替链条炉后,NOx的减排率达到了58．5％。同时对目前水煤浆领域中存在的问题进行了分析,并提出了建议。     

Viscosity variations of coal-oil slurry under high temperature and high pressure during heating process

Heating coal-oil slurry (COSL) is an important step in direct coal liquefaction. Some physical and chemical properties of COSL including its viscosity will change during heating. A rotary viscometer was self-designed to measure the viscosity of COSL under high pressure and temperature. Three kinds of coal, which are Yanzhou coal (middle rank and caking), Shenhua coal (low rank and non-caking) and Shengli coal (brown coal), were mixed with anthracene oil to prepare the COSL. The COSL from Yanzhou, Shenhua and Shengli at the same experimental conditions showed different viscosity variations under high hydrogen pressure during heating. Yanzhou COSL had a higher viscosity peak, while Shenhua COSL had two small viscosity peaks and in the case of Shengli COSL, no viscosity peak was present under a high hydrogen pressure during the whole heating process. The coal nature is the important factor of viscosity variations of COSL. The higher the coal rank, the more caking coal is present, and the more obvious the viscosity variations of the COSL are.     

浆体管道中大颗粒干涉力研究

为了研究输送大颗粒的垂直浆体管道中固体颗粒所受的干涉力,采用相关专家的实验数据,发现大颗粒垂直浆体管道中大颗粒受到的干涉力要大于小颗粒所受的干涉力。在此基础上,采用数据拟合方式给出了干涉力修正系数的表达形式。将得到的干涉力应用于管道中颗粒受力分析中,并运用在大颗粒垂直管道阻力损失的计算模型中,通过实验数据验证了干涉力对阻力的影响。     

低变质程度煤制浆中试试验研究

为研究适合宁东煤制备水煤浆的工艺条件,以水煤浆制备中试装置为基础,通过调整磨机装球比例、添加剂加量试验、可制浆浓度试验、磨机负荷试验,得出了钢球最佳装填量为40%。在此条件下,添加剂加量在0.45%~0.50%,该煤可制取质量分数为62%~63%的煤浆,并能保证较高的磨机生产负荷。     

生产周围糊与炭块频繁更换筛网的工艺技术探讨

对在生产铝用阴极炭块和糊料的破碎筛分生产工序产生的频繁更换筛网而影响企业产能发挥的问题进行了工艺技术探讨及解决.生产实践证明,通过调整周围糊工艺配方的粒度级别与阴极炭块的粒度级别相一致,重新选择生产周围糊的最佳工艺技术配方的措施的实施,效果优良切实可行.     

Aluminothermal synthesis and characterization of Li3V2−xAlx(PO4)3 cathode materials for lithium ion batteries

Monoclinic Li₃V_2−xAl_x(PO₄)₃ with different Al³⁺ doping contents (x = 0, 0.05, 0.08, 0.10 and 0.12) have been prepared by a facile aluminothermal reaction. Aluminum nanoparticles have been used as source for Al³⁺ and nucleus for Li₃V_2−xAl_x(PO₄)₃ nucleation as well as reducing agent in the aluminothermal strategy. The products were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and electrochemical methods. The XRD results show that the as-obtained Li₃V_2−xAl_x(PO₄)₃ has a phase-pure monoclinic structure, irrespective of the Al³⁺ doping concentration. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) results reveal that the charge-transfer resistance of the Li₃V₂(PO₄)₃ is reduced and the reversibility is enhanced after V³⁺ substituted by Al³⁺. In addition, The Li₃V_2−xAl_x(PO₄)₃ phases exhibit better cycling stability than the pristine Li₃V₂(PO₄)₃.