抗强冲击特殊低温储罐内支承结构传热分析

本文采用有限元法对特殊低温储罐内支承结构进行传热分析,建立了左右支承结构在有限元传热分析模型,得到了相应的温度场和热流分布,计算出通过内支承的总漏热量,并对影响漏热量的几个主要因素进行了计算分析。     

Two-phase flow pressure drop of liquid nitrogen boiling in the straight section downstream of U-bend

The gas-liquid(two-phase) flow pressure drop of liquid nitrogen boiling in the straight section downstream of U-bend is investigated experimentally. The mass flux ranges from 32 to 280 kg/(m2· s). The inlet pressure of U-tube is from 140 to 272 kPa. And the curvature ratio is from 6.67 to 15. The tube wall including the U-bend is heated uniformly and the heat flux ranges from 0 to 22 kW/m2. The tube with higher inlet pressure has higher pressure drop in the downstream section of the bend. The bended degree of the U-bend influences the pressure drop in the downstream straight section of U-bend. A new correlation taking the effect of the secondary flow into account is proposed for the two-phase slip speed ratio. The pressure drop in the straight section downstream of U-bend calculated by the new correlation agrees well with experimental measurements.     

真空吸气剂PdO粉末的微观结构

为了研究真空多层绝热储罐中PdO粉末对H2的吸附机理,利用ASAP2010型物理吸附仪,在77 K下对PdO粉末进行高纯N2吸附和脱附,分析其微观结构.结果表明: PdO粉末的吸附等温线属于第Ⅳ类吸附等温线,起始部分满足BET二常数公式;在吸附等温线中间段,发生毛细孔凝聚,吸附量急剧增加;吸附等温线和脱附等温线之间存在着滞后环,当相对压力达到0.9时,出现吸附饱和现象; PdO粉末的固体孔结构多为中孔,孔结构是两端都开放的管状毛细孔, PdO粉末比表面积为14.669 m2/g,孔容积为0.030 984 cm3/g,孔径范围为1.700～20.000 nm,平均孔径为8.449 nm.     

大型船舶艉管轴承冷装工艺探讨

本文从实用出发,提出大型船舶艉轴承采用冷装工艺方法,并进行了分析计算。     

低温容器稳压供气研究

本文研究了低温容器稳压供气原理，建立了挤压式稳定供气系统设计计算步骤并编制了计算机程序，可以很方便地计算所需水浴式盘管汽化器及增压器的传热面积，供气温度及初始自增压规律，计算结果与试验结果相符合，具有较好的工程计算应用价值。     

移动式压力容器法规标准工作的设想

系统地介绍了移动式压力容器国内外法规和标准的现状,通过国内外法规和标准的分析,对我国移动式压力容器的法规及标准体系提出一些设想和建议.     

Simulation and Comparative Study of CO2 Capture in Underwater LSS Using HYSYS

Long-duration manned submersible missions require advanced life support systems (LSS) that can regenerate air, water and food. This study presented two CO_2-capture methods used in LSS, CO_2 removal with diethanolamine (DEA) and cryo-freezing with liquid oxygen. Both processes were modeled and simulated with HYSYS simulator. The performance of the two types of module was compared, and the results showed that the latter could be advantageous over the former in specific power, facility scale, operation reliability and safety. Economic evaluation suggested the latter cost only half of the former. Cryo-capture module could be an alternative for underwater LSS because of its efficiency and compactness.     

Thermal structure of glass fiber reinforce plastic support structure

The assembled form of thick-wall glass fiber reinforced plastics (GFRP) tube and OCr18Ni9 ansteniticstainless steel pipes was designed as the radius thermal-insulating and load-supporting structure in cryogenicvessels. In order to study the thermal leakage and gap changes on the support structure, as well as radiustemperature and stress distribution on GFRP tube, an experimental investigation has been taken. The resultsindicate that the support structure is proved to fit well as thermal-iusulating and load-supporting part in cryo-genic vessels, furthermore has high security during cryogenic applications.     

Experimental investigation of a cryogenic filter for separating solid carbon dioxide particles from liquid nitrogen

This paper presents an investigation of a new method of purifying cryogenic liquid using sintered metallic wire-mesh filter, which has the advantages of high purifying efficiency and preferred strength at absolutely low temperature. Experiments are conducted to purify solid CO2 particles from liquid nitrogen. Temperature and pressure in the upstream and downstream of the filter, and the flow rate of carbon dioxide (CO2) gas and liquid nitrogen are measured, with the gas content of filtrate analyzed using a CO2 concentration detector. It is illustrated that after filtration, the purity of liquid nitrogen (volume fraction) is higher than 99.99%, which means that the volume fraction of CO2 is less than 0.01%. Effects of operation parameters on the performance of the filter, such as pressure drop △p and filtration efficiency E are analyzed quantitatively. The present conclusions will provide a guideline to the optimumal design and operation of sintered metallic wire-mesh filter in cryogenic application.     

水下密闭空间生存环境的综合改善技术——采用低温冷冻法改善潜艇舱室大气环境的空气净化系统

提出了采用低温冷冻法清除潜艇舱室有害气体的系统思路；并介绍了该方法在AIP潜艇和核潜艇上的系统流程。与目前采用的潜艇空气净化方法相比，低温冷冻法具有能够清除的有害气体种类多，系统本身不产生有害气体，能够杀菌消毒和辅助艇舱降温等一系列优点，对于全面改善舱室生存环境，降低潜艇动力消耗，提高潜艇续航能力等具有积极意义。