加氢装置加热炉易爆管部位的分析

重点介绍韩国蔚山炼油厂分馏塔底重沸炉火灾事故、中国石油化工股份有限公司洛阳分公司催化裂化柴油加氢装置反应进料加热炉火灾事故、茂名分公司渣油加氢脱硫装置分馏炉火灾事故、镇海炼油化工股份有限公司加氢裂化装置脱丁烷塔底重沸炉火灾事故的情况,找出加氢装置加热炉的易爆管部位,并通过分析总结,提出了易爆管部位的选材原则、设计改进方案及维护措施.     

Experimental investigation and simulation analysis of the thermal performance of a balcony wall integrated solar water heating unit

A balcony wall type solar water heater system was designed and constructed in a high-rise building. The U-type evacuated glass tube solar collector is fixed vertically on the balcony wall. The water, heated in the solar collector, flows through the exchanger coil in the water tank and then flows back to the solar collector. With regard to the hot water supply system, the cold water, heated by the heat exchanger, is sent to the point of use. Considering storeys and water consumption pattern, four apartments are selected for testing. Meanwhile, the theoretical analysis with TRNSYS was presented. According to the experimental results, mean daily collector efficiency is about 40%. Solar fraction is high in summer and autumn for the relative high radiation and high ambient temperature. Under given conditions, the annual energy extracted from tank is 2805.3 MJ/m², and the annual solar fraction is 40.5%. When the tank volume-to-collector area ratio is decreased to 37.5 L/m², the solar fraction can be increased to 50%. The results show that the family to use water all day round gets higher solar fraction than the family using hot water mostly in the morning and night.     

超薄型金属氧化物／搪瓷复合辐射涂层蓄电池加热装置

为了解决战斗车辆在冬季使用中由于气温太低而造成蓄电池输出容量下降和充电困难问题,我们研制了一种超薄型红外线加温装置。该装置采用金属氧化物搪瓷复合涂料作为辐射层,具有发射率高、电一热转换效率高、抗腐蚀、不易脱落等特点。该加热装置体积小,重量轻,坚固实用,经3个冬季实车试验,效果令人满意。     

大功率电视发射管的灯丝供电方式及其对管子寿命影响的探讨

本文详尽地讨论了电子管灯丝分档加压过程的电流冲击和对灯丝电路采用逐渐平滑加电方式的必要性,并举例说明了平滑加电对延长电子管使用寿命的显著效果。     

Fabrication of micro heaters on polycrystalline 3C-SiC suspended membranes for gas sensors and their characteristics

This paper describes the design, fabrication, and characteristics of micro heaters mad on AlN (0.1 μm)/3C-SiC (1 μm) suspended membranes using surface micromachining technology. 3C-SiC and AlN thin films, which have a large energy band gap and very low lattice mismatch, were used for high-temperature environments. A Pt thin film was used as micro heaters and temperature sensor materials. The resistance of the temperature detector (RTD) and the power consumption of the micro heater were measured and calculated. The heater is designed for an operating temperature up to about 800 °C and can be operated at about 500 °C with a power of 312 mW. The thermal coefficient of the resistance (TCR) of fabricated Pt RTD’s is 3174.64 ppm/°C. The thermal distribution measured by IR thermovision is uniform across the membrane surface.     

双段式加热锗单晶生长设备的结构设计

锗单晶和锗单晶片是重要的半导体材料,锗单晶的生长广泛采用的是CZ(直拉)法,其主要结构包括底座及立柱装置、下传动装置、主炉室、插板阀、副炉室、籽晶提升旋转机构、液压驱动装置、真空系统、充气系统及水冷系统等。     

中型立筒仓共用管道熏蒸杀虫通风降温试验

立筒仓粮堆在储藏期间感染害虫和不正常升温,是安全储粮的难题,本试验在立筒仓内安装了一套共用管道系统,兼有熏蒸杀虫,通风降温和熏蒸残余气体利用的功能。使用该系统进行环流熏蒸,仓内各部位熏蒸气体分布均匀,杀虫效果达到100％,还配备了带有加热装置的气化器,在大气温度低于15.6℃和用药量超过51b的情况下,可使液态熏蒸剂充分气化,而达到理想的杀虫效果。该系统通风降温效果好,通风后每米粮层温差<1℃。将两个立筒仓的共用管道串接,可将熏蒸仓内约40％的熏蒸气体输送至邻仓,解决了残留药剂的利用问题。该试验安装的共用管道系统具有设计合理、设备简单的特点。     

基于ANSYS Workbench的太阳能热水器支架优化设计

建立了某型号太阳能热水器安装支架力学分析模型,并针对其2种改进方案,利用专业大型CAE软件ANSYSWorkbench,以最大等效应力最小为优化设计目标,以增加的连接杆的位置为设计变量,进行了分析对比和优化设计,确定了该支架的优化方案及连接杆最合理的位置.在AWE环境下Design Modeler模块中对支架进行三维建...     

煤气化有机热载体炉设计与开发

混合煤气发生炉与有机热载体炉配套使用符合混合煤气生产流程(即不洗涤降温,不贮存,随产随用),有利于提高可燃物质的燃尽率,提高有机热载体炉的热效率,既节能又环保.     

空气源热泵冷热水机组供热最佳能源利用率平衡点温度的研究

提出了最佳能源利用率平衡点的概念,建立了求解最佳能源利用平衡点的数学模型,给出了我国适用空气源热泵各地区相应不同锅炉效率、不同使用条件下的最佳能源利用平衡点温度。为广大设计人员提供了参考。