总铬分析前处理方法的改进探讨

采用密塞高压蒸汽法代替锥形瓶,加热氧化法测定总铬,缩短了分析时间,操作简便,分析结果精密度高、准确度好。     

热泵蒸发及其在浓缩垃圾渗滤液中应用的初探

在热泵蒸发过程中,二次蒸汽压缩比是个至关重要的参数,它直接关系到热泵蒸发的经济程度。对热泵蒸发中的传热过程及可利用的余热作了全面分析。最后对热泵蒸发在浓缩垃圾渗滤液中的应用进行了探讨。     

新概念消防车的发展

分析了新概念消防车的发展现状,介绍了新概念消防车目前主要开发的品种、灭火原理、特点及结构等,可应用于扑灭石油化工企业火灾、大跨度建筑物火灾、地下工程火灾、飞机火灾等多方面。     

测定水中总氮的消解方法

废水中总氮测定的预处理一般采用经典的压力蒸汽灭菌器消解,其缺点是消解时间较长、操作较为繁锁。经多次试验并查阅了相关资料,可以用COD消解仪、电热恒温干燥箱和微波炉代替压力蒸汽灭菌器进行消解。在保证测量准确性和精度的前提下,可以节约时间、简化操作步骤,提高工作效率。     

Reforming of CO2-containing natural gas with steam in AC gliding arc discharge for hydrogen production

In this study, a low-temperature gliding arc discharge system was used to investigate the effects of steam content and operational parameters, i.e. total feed flow rate, applied voltage, and input frequency, on the reforming performance of CO₂-containing natural gas. The addition of steam less than 10% was found to enhance both selectivities for hydrogen and carbon monoxide with a significant reduction of power consumptions. The highest hydrogen selectivity and yield with the lowest power consumptions were achieved at a steam content of 10 mol%, a total feed flow rate of 100 cm³/min (corresponding to a very short residence time of 1.37 s), an applied voltage of 13.5 kV and an input frequency of 300 Hz. Under these optimum conditions, the oxidative dehydrogenation reactions to produce hydrogen were dominant with the minimum activities of all undesired reactions of cracking and coupling. Both of the short residence time (1.37 s) with a low bulk temperature (lower than 200°C) in the plasma zone under atmospheric pressure, indicate that the studied plasma reactor (gliding arc system) is superior to conventional catalytic reactors for reforming of natural gas.     

Numerical modeling and optimization of a power augmented S-type vertical axis wind turbine

An axial symmetry augmented vertical axis wind turbine, which is suitable for arbitrary wind directions, is proposed in this paper. In order to improve the power generation ability of the S-type vertical axis wind turbine, a set of so-called “collection-shield boards” are installed symmetrically around the rotating S-type rotor. The flow fields around this type of wind turbine are numerically simulated with the aid of CFD method. The optimized design of geometrical parameters of the rotor and collection-shield boards is conducted by using the orthogonal design method. The obtained results suggest that the power output of the optimized augmented wind turbine can reach nearly three times higher than that of the conventional S-type vertical axis wind turbine.     

燃油锅炉房的灭火系统

根据燃料特性及工艺特点,阐述了蒸汽灭火系统、水喷雾灭火系统、干粉灭火系统和泡沫灭火系统在燃油锅炉房中的应用条件、主要设计参数及与通风排烟系统的关系。     

基于STAMP模型的核动力蒸汽发生器水位控制系统安全性分析

核电厂蒸汽发生器(SG)水位控制系统的安全可靠运行是保证核电厂安全性和经济性的关键因素,其控制对象具有高度复杂、非线性的特点。由于复杂系统的安全性是特定环境下由系统相关要素交互作用所产生的一种涌现特性,运用系统理论,以STAMP模型为基础对SG水位控制系统进行安全性分析,以利于在设计早期阶段发现影响该系统安全运行的潜在风险因素,预防危险事故。该方法将系统理论用于核电厂关键系统和设备安全性分析,为核电厂安全运行提供了新的技术手段支持。     

炼油厂IGCC电站NOx排放控制技术比较与工程实践

针对IGCC电站烟气排放ρ（NO_x）不达标的问题,分别采用燃气轮机注氮脱硝和余热锅炉（余热蒸汽发生器,HRSG ）SCR脱硝技术降低烟气的NO_x排放量。介绍了两种技术的原理,比较了两种技术的脱硝效果、运行成本及技术特点。实际运行结果表明：安装了注氮设备的燃气轮机可以控制排气的ρ（NO_x）小于90 mg/m³,但每年的运行成本较高（达2 250万元）;在余热锅炉中安装SCR脱硝设备,性能测试数据符合设计要求,SCR出口ρ（NO_x）小于50 mg/m³,且每年的运行成本较低,仅为422万元。     

超临界机组与凝改抽机组供热方案的能耗分析

针对北方某城市的一个规划采暖供热区域的350MW超临界机组供热和将原有2×220MW纯凝机组改为供热机组供热的两种供热方案,就两种不同供热方案的初投资能耗和运行能耗进行了综合能耗比较,从节能的角度就供热方案的选择给出了参考意见。