冬季寒冷地区超高层建筑防烟楼梯间热压效应研究

采用现场实测与数值模拟方法，研究热压作用对超高层建筑楼梯间压差分布的影响。通过对楼梯间与前室压差分布进行实测，指出由于避难层对楼梯间的分隔作用，使得压差在不同分区内，呈现错位增长的分布规律。用Fluent 模拟对实验研究进行补充，通过拟合模拟数据，对原有热压计算公式进行修正，提出适用于有一处避难层的超高层建筑的热压差计算公式。     

Structure characteristics and adhesive property of humic substances extracted with different methods

The structure characteristics and adhesive property of humic substance(HS) extracted with different methods were mainly studied by terms of elementary analysis,visible spectrum,FT-IR spectroscopy,viscosity,adsorption and pelletizing experiments.The results show that HSs extracted with new method(HS-a) own higher degree of aromatization and polymerization,larger relative molecular mass and more polar functional groups than HS extracted with usual method(HS-b).The viscosity of HS-b is about 30-40 mPa·s lower ...     

Improving extraction yield of humic substances from lignite with anthraquinone in alkaline solution

Based on the characteristics of the lignite sample, effects of assistant anthraquinone (AQ) on extraction yield of humic substances (HS) and the action mechanisms of AQ in alkaline condition were studied by Fouvier transform infrared (FT-IR) spectroscopy. The results indicate that assistant AQ can not only increase the extraction yield of HS but also reduce the alkali dosage (NaOH) as well as the extraction temperature and extraction time. Under the optimal conditions of alkali dosage of 9%, AQ dosage of 0.75%, extraction temperature of 80 °C, extraction time of 30 min, stirring speed of 600 r/min and solid-to-liquid ratio of 1:3, the extraction yield of HS reaches 80.08%, which is increased by more than 20% compared with the conventional extraction. FT-IR spectra show that AQ is able to prevent dissolved HS from being destroyed into undissolved substance by alkali and HS obtained in the presence of AQ possesses more groups of -COOR and -COOH than that obtained without AQ.     

Adaboost集成BP神经网络在火电厂SO2浓度检测中的应用

针对火电厂在线SO2浓度检测中,检测精度受到温度、压力(大气压及烟气压力)、燃煤质量、水分含量、电子器件噪声、光学镜片老化、气体吸收峰值交叉干扰等多种因素的干扰,很难以单一方法进行改进这一问题.以国内某中型火电厂2015年实际生产数据为依据,设计预处理装置完成气体的前期处理,以尽可能达到分析仪分析要求(温度、流量、含水量等),减少可预见干扰,采用Adaboost算法集成BP神经网络进行优化,降低其他因素对检测结果的干扰,仿真测试分析,证明了该方法的有效性.     

一种基于Multi—Agent的工程项目智能评标模型

通过评标活动中的角色类型的抽取,提出一个基于Multi-Agent的智能评标模型框架,来模拟实际专家的评定过程,实现标书的智能评定,并深入探讨了该模型中功能Agent的设计、知识表示和通信机制的设计方法.     

氧化亚铁硫杆菌浸出铁矿石脱磷技术

研究氧化亚铁硫杆菌（A.f菌）从含磷铁矿石中脱磷的可行性及工艺技术。结果表明：氧化亚铁硫杆菌可以浸出铁矿石中的磷,生物浸出脱磷应选择缺磷9 K培养基体系,添加黄铁矿可强化细菌浸出脱磷,矿浆初始pH对脱磷率有明显影响,合适的细菌接种量、亚铁初始含量及矿石粒度有利于生物浸出脱磷。对某含磷1.12%的铁矿石,以缺磷9 K培养基为浸出体系,添加质量比为20%的黄铁矿,在初始pH值为1.7-2.0的条件下,采用A.f菌进行生物浸出,获得的脱磷率为86.6%。     

锈蚀法从浸锌渣还原铁粉中分离镓锗的基础与应用

研究了用锈蚀法分离浸锌渣还原铁粉中的镓和锗的热力学基础与技术条件. 结果表明, 控制溶液pH值和电位φ, 可使金属铁生成针铁矿(FeOOH)沉淀, 镓、锗分别以Ga3 、 H2GeO3形式进入溶液. 实现Ga、 Ge与Fe分离的热力学条件为: 25.℃下, pH值0.685～2.742, 电位φ＞(0.892.3-0.177.3pH).V; 80.℃下, pH值0.130～1.857, 电位φ＞(0.908-0.210.1pH).V. 锈蚀试验表明: H2O2流量为0.2～0.5.mL/min, pH值为1.0～1.5, 温度80.℃, 时间为60～80.min的条件下, 对含Ga 1.538.g/t、 Ge 1.292.g/t 和Ga 2.160.g/t、 Ge 1.403.g/t的两种浸锌渣还原铁粉进行锈蚀试验, 可使90%左右Ga、 Ge转入溶液.     

Fundamental study on utilization of tin and zinc-bearing iron concentrate by selective chlorination

The feasibility and technologies of comprehensive recovery of tin, zinc, arsenic and iron from the complex iron ores by selective chlorination roasting were studied by thermodynamic analysis and roasting experiments. Investigation shows that the product pellets with the compression strength of 2 625 N/P, the tumble index of 97. 26%, the abrasion index of 1. 35%, tin, arsenic and zinc residue of 0. 043%, 0. 046% and 0.058% respectively can be achieved if bailing a concentrate containing 0.39 % tin, 0.40% arsenic and 0.28% with addition of 8% coke breeze and 0. 5% CaCl2 and roasting the pellets at 1 060 - 1 080℃ for 40 min. The volatilization of tin, arsenic and zinc is 91.75 %, 93.42 % and 81.12 % respectively. The performances of the product pellets are able to meet the requirements of blast furnace ironmaking.     

砷黄铁矿在酸性体系下的电化学氧化

在酸性体系下研究砷黄铁矿的电化学氧化。结果表明:砷黄铁矿首先被氧化为As2S2,覆盖于电极表面,使电极表面发生钝化;随着电位的继续升高,As2S2被氧化生成亚砷酸,随后亚砷酸被氧化为砷酸,亚铁离子被氧化成铁离子。不同pH和温度下的腐蚀动力学研究表明,随着pH值的增大,体系的腐蚀电位正移,腐蚀电流密度减小;随着温度的升高,砷黄铁矿的腐蚀电位负移,腐蚀电流密度增大。说明在研究的pH及温度范围内,降低体系的pH或提高温度都有利于砷黄铁矿的氧化。交流阻抗研究结果表明,不同电位下电极表面发生的电化学反应机理不同,测定结果与线性扫描的研究结果相吻合。     

燃煤特性对回转窑结圈的影响

为了解决或延缓回转窑结圈的问题,分析了A,B,C3种燃煤的反应性、燃烧性及其灰分的软熔性和粘结性,同时分析了燃煤特性对回转窑结圈的影响。研究结果表明:煤着火温度低,能减少窑内黑火头的范围;煤反应性较弱,燃烧时间较长,其在回转窑中燃烧区间长,保证窑尾和链篦机预热段所需高温;煤灰软熔性好,不易形成低熔点物质;煤灰粘结性弱,不易粘结而形成结圈。