大型LNG撬装气化站的优化设计

对于LNG撬装气化站设计规模的日趋扩大,本文重点阐述较大规格LNG撬装气化站的一种设计方法,从传统的一体式撬装结构,改进设计成分体组合式撬装结构,希望能促进LNG撬装气化站的发展和进步。     

LNG汽车加气站主要工艺流程及装置的性能要求

本文主要介绍了LNG汽车加气站的工艺流程,以及LNG加气站的主要设备LNG槽车、LNG储罐、气化器、低温泵、加气机的结构、使用方法和注意事项。     

新疆金康达能源设备有限公司

正新疆金康达能源设备有限公司位于乌鲁木齐经济技术开发区大别山街89号,公司专业生产:CNG加气机、LNG加液机、L-CNG站控系统、L-CNG撬装站、LPG加气机、加油机。同时代理销售国内外知名品牌整站设备:LNG储罐、LNG低温泵、气化器、增压器、调压撬、压缩机、CNG脱硫、脱水、干燥装置、储气瓶组、储气井、槽车、高压/低温管件阀门等。公司凭借多年的行业经验和坚实的技术基础,依托高校的科研实力和公司的开发团队推出了专业高品质产品,公司秉承质量至上、用户至上,产品从研发、采购、生产、调试每个环节严把质量关,力求做到质     

浅谈加气站车载气瓶充装安全双体系建设

安全生产风险分级管控和事故隐患排查治理双重预防体系(简称双体系)自2016年开始建设以来在化工、特种设备等行业得到了较快的应用与发展。特种设备作为对人类生命财产安全具有重大威胁的设备种类,其双体系的建立就显得尤为重要。加气站作为车载气瓶充装的经营单位,特种设备主要有LNG储罐、CNG储气瓶组和压力管道等。作为CNG和LNG的充装单位,储存有大量的CNG和LNG,并且时常进行CNG和LNG的车载气瓶充装,其危险程度不言而喻,所以建立特种设备双体系显得尤为重要。文章以车载气瓶充装为主体,对双体系的建设过程进行了介绍和分析,通过双体系的运行情况结合发现的问题进行了总结。通过双体系的建立和运行,切实减少了加气站在管理和使用过程中的安全隐患,对加气站的安全管理和安全保障具有重大意义。     

LNG罐箱储备调峰BOG回收经济性分析

首先简要介绍LNG罐箱在储备调峰方面的应用及BOG的产生和处理现状,接着分析LNG罐箱储备调峰过程中,小型撬装式BOG再液化装置的应用和经济性.从设备投资、运营成本、投资回收周期等方面综合分析比较,为降低LNG罐箱储备调峰综合运营成本提供一种有效措施.     

基于有限元法的撬装式压缩机撬体分析

随着撬装式压缩机的普及,撬体设计的合理性越来越受到关注。本文利用Ansys软件对某撬装式压缩机在起吊过程中撬体的变形和应力分布进行模拟计算与分析,验证该撬装式压缩机撬体设计的可靠性。     

加气站中的LNG提压汽化综合用能系统

提出了一种加气站中LNG提压汽化综合用能系统,利用LNG汽化过程的压力能产生动力驱动低温泵,不需要额外消耗电能.系统同时可以利用中间冷媒回收LNG冷量,能量利用率优于传统天然气加气站,降低了运营成本,节能效果明显.     

大型LNG储罐罐底保冷层结构优化研究

针对大型LNG储罐罐底漏热量大及基础保冷性能差等问题,对储罐底部保冷结构进行了优化,并对不同储罐底部基础的温度场分布和漏热量进行了数值模拟和现场对比分析。结果表明:储罐冷损失与泡沫玻璃砖厚度呈双曲线函数关系,在内外壁温差为185 K时泡沫玻璃砖保冷层厚度设置为600 mm保冷效果显著,再增加厚度时保冷损失减小缓慢;储罐基础采用夯土基础时保冷性能优于柱桩基础,而夯土基础需在罐底设置加热系统,因此工程上大型LNG储罐需根据实际情况进行选择。     

LNG大型低温储罐冷却技术探讨

LNG大型低温储罐的冷却是储罐投用前最为关键的一步,充分的储罐冷却作业前准备、冷却过程中系统阀门的正确设置、储罐冷却速率的合理控制及安全措施的严格执行是LNG大型低温储罐冷却得以顺利实施的重要保证。以国内某一16万m3全容式LNG储罐为例,对LNG大型低温储罐的冷却技术进行了详细的论述。     

LNG低温储罐泡沫玻璃砖国产化应用

<正>我国已建及在建液化天然气(LNG)低温储罐一般为全容型LNG低温储罐,主要由预应力混凝土外罐、内罐、热角保护系统、保冷系统、管道等部分组成。LNG低温储罐处于低温-162℃微正压状态,外界的热量漏入会引发LNG蒸发、增加能耗,因此LNG低温储罐的保冷系统尤为重要。保冷系统由罐底保冷、内罐壁保冷、铝吊顶保冷、内外罐环形空间保冷及管道保冷组成,保冷材料的选择需要根据LNG低温储罐结构特点、材料的绝热性能、经济性及方便安装等方面考虑,一般罐底选取抗压强度较高的泡沫玻璃砖,内罐壁、铝吊顶保冷选取弹性玻璃纤维毡,环形空间由膨胀珍珠岩填充[1]。     

超导波荡器热负荷测试装置超高真空系统

介绍了超导波荡器热负荷测试装置超高真空系统的设计、调试。通过离子泵、吸气剂泵以及系统低温冷凝面的联合抽气作用,使系统在常温下获得7.8×10-8Pa的真空度,在低温下能够获得1.7×10-8Pa的真空度,满足光源储存环真空系统1.3×10-7Pa的真空度要求。     

卧式高真空多层绝热低温容器无损贮存规律

介绍了卧式低温容器的传热特点,以及低温液体无损贮存的传热模型.通过2m3卧式高真空多层绝热低温容器在90%、85%和80%初始充满率下的静态无损贮存试验,拟合现有的传热模型,对升压过程中不同规律的3个阶段进行了分析,得到了第一、第三阶段升压的初步规律.     

Exergy analysis of a low temperature heat pump

The low temperature heat pump is a simple and reliable device for attaining cryogenic temperatures. Heat is pumped from low temperature to ambient. The pressure on both sides of the displacer is the same except for a small differential pressure caused by the pressure drop produced when gas is flowing through the regenerator. Thus, no appreciable work is required to move the displacer and no net work is done by the displacer. This paper presents an exergy analysis of the device in order to estimate the various losses. The exergy balance reveals that the exergetic efficiency of the device is only 9.4% hence this approach may enable the designer to minimise the losses and make the unit highly reliable.     

A vibration free cryostat using pulse tube cryocooler

This paper introduces a new vibration free cryostat cooled by liquid helium and a 4 K pulse tube cryocooler. The cryogenic device mounts on the sample cooling station which is cooled by liquid helium. The boil off helium is recondensed by the pulse tube cryocooler, thus the cryostat maintains zero boil off. There is no mechanical contact between the cryogenic part of the cryocooler and the sample cooling station. A bellows is used to isolate the vibration which could transfer from the cryocooler flange to the cryostat flange at the room temperature. Any vibrations generated by the operation of the cryocooler are almost entirely isolated from the cryogenic device. The cryostat provides a cooling capacity of 0.65 W at 4.21 K on the sample cooling station while maintaining a vapor pressure of 102 kPa. The sample cooling station has a very stable temperature with oscillations of less than ±3 mK during all the operations. A cryogenic microwave oscillator has been successfully cooled and operated with the cryostat.     

Entwicklung eines Ionisationsmanometers mit Feldemitterkathode

Development of an ion gauge with field emissionin cryogenic vacuum environments cathode for pressure measurements The measurement of UHV or even XHV pressures in low‐temperature vacuum systems has always been considered as a metrological problem. In principle, conventional hot‐cathode ion gauges can be used for pressure measurement in cryogenic vacuum environments. However, as a consequence of their high heat generation several disadvantages must be taken into account. With the development of an ion gauge of extractor‐type whose heat‐generating thermionic cathode is replaced by a non‐thermal field emission cathode, a promising approach to realize a reliable pressure gauge for cryogenic vacuum applications can be presented in this paper. The gauge equipped with a CNT cathode was investigated both experimentally and by numerical simulations in terms of their operating characteristics. It has been successfully demonstrated that the modified extractor gauge works reliably under low temperature conditions and provides meaningful pressure readings.     

一种用于冲击压缩实验的液氦温度低温靶

介绍了研制的一种液氦温度低温靶靶体。该靶体具有独立真空夹层与气冷屏,采用连续流减压降温的液氦制冷方式,在约100 Pa真空环境下,获得了稳定的4.2 K制冷温度。它可以用于氦等气体样品的冲击压缩实验。     

低温容器的绝热性能指标及其估算

提出考核低温容器绝热性能的第二种指标及其计算方法，并用平板公式替代圆筒壁公式进行导热计算的误差分析。     

Design,modification and test of the conduction cooled high-current current leads for the superconducting magnet

Conduction cooled current leads, which bring the current from the room temperature terminal down to the cryogenic environment, were used in common recently in large scale superconducting accelerators for its low cost, sample design and low heat load. In practice, the current lead is designed contained in a stainless steel tube. The heat load can be incepted in steps by thermal anchors, where one end is attached to the stainless steel tube, while the other end is connected with the cold shield of the cryomodule. Since the limitation of the welding technique, a thicker stainless steel tube needs to be used, and hence the thermal anchors cannot provide enough pressure to deform the tube enough to be in direct contact with the current lead, which may lead to temperature instability and bring extra heat load to the cryogenic system. An excellent option of epoxy filled current lead can realize the fully contact and reduce the heat load effectively. This paper will present the process of the current lead design, optimization, numerical simulation and cryogenic test, the test results show that the current lead can keep in a stable operation and low heat load.     

泵内压降和水力损失耦合诱导泵内液氮空化研究

为了研究泵内压降和水力损失耦合诱导泵内液氮空化,采用Zwart空化模型和RNG k-ε湍流模型,并使用CEL语言将饱和蒸气压随温度变化函数关系式导入CFX软件中进行求解,对不同流量下低温泵的空化特性曲线进行分析。研究结果表明,低温泵内压力、温度和空泡体积分数分布与空化的发展程度有关,由于水力损失的作用,小流量工况下,泵内会出现涡状流,从而对叶轮内空化产生影响。     

Study on effect of liquid level on the heat leak into vertical cryogenic vessels

The diminishing of heat leak into cryogenic vessels can prolong the storage time of cryogenic liquid. With the storage of cryogenic liquid reducing, the heat leak decreases, while the actual storage time increases. Compared with the theoretical analysis, the numerical simulation can more accurately calculate the heat transfer and temperature distribution in the vessel with complex structure. In this paper the steady state heat leak into cryogenic vessels with different liquid level height is analyzed using a finite element model. And liquid nitrogen boil-off method was adopted in experiments to validate the result of numerical simulation. Experimental results indicate favorable agreement with numerical simulation by ANSYS software. The effect of liquid level on heat leak into the cryogenic vessel can be considered in calculation of storage time and structure design.