LNG船用BOG再液化工艺系统效能优化

利对LNG船用BOG再液化流程进行模拟优化研究,通过选用合理的模拟模块建立工艺流程模拟图,对BOG再液化装置工艺流程进行热力学模拟计算。在分析由模拟得出的参数的基础上,以工艺系统最低功耗为优化目标函数,选取合适的约束条件和优化步长对再液化流程进行优化。优化中采用变量轮换法进行优化计算,得出主要工艺设备最优化的性能参数,与工艺优化前相比,降低了系统总功耗,提高了制冷循环的制冷效率。     

两种LNG装置BOG再液化方案的回收经济性对比

首先简要介绍了目前LNG储运装置BOG产生的现状,以及目前回收BOG再液化的一些方法。接着分别针对低温制冷机和液氮作为冷源的两种方法的回收运营成本(前者比后者低约40%)进行分析比较,最终得出用低温制冷机作为冷源再液化BOG成为LNG是经济的(液化1 kg的BOG仅需花费1.35元)。     

低温液化气船再液化原理及再液化装置概述

介绍了低温液化气船上的特殊制冷装置———再液化装置 ,介绍了液化气体的再液化原理 ,再液化装置的功能与类型     

低温液化气船的制冷装置—再液化装置

本文介绍了低温液化气船上的特殊的制冷装置——再液化装置，分析了再液化装置的功能、基本类型以及基本要求；介绍一个典型的再液化装置流程及设备组成     

乙烯BOG再液化流程的分析

针对现有液态乙烯运输船的BOG再液化装置(火用)效率低的问题,进行了流程优化.在对现有和优化流程进行热力学分析的基础上,进行了优化前后的乙烯BOG再液化系统和制冷剂循环系统的(火用)分析.结果表明:优化的乙烯BOG再液化流程的(火用)效率为29%.相比现有流程(火用)效率26.5%,提高了9.6%.     

半冷半压式液化石油气船再液化装置研究

再液化装置是半冷半压式液化石油气船的关键设备,在保障液化石油气船运营的安全性和经济怀方面发挥着重要作用。首先对大型半冷半压式液化石油气船再液化装置适用的制冷循环类型进行了分析,然后在液化热力参数计算的基础上对低温液化流程进行了热力计算与优化,最后对再液化装置进行了有效能分析,提出了减少再液化装置有效能损失的措施。     

改进工艺流程 实现液化设备节能降耗

YPON-2000/3000型液化设备自投运以来,存在自动化控制程度低、设备故障率和能耗水平高等弊端。通过改进工艺流程,优化工艺操作控制,实现了由两次制冷工艺改为一次全增压膨胀制冷的生产工艺,延长了液化设备的安全运行周期,降低了能耗。介绍对液化设备实施优化改造的具体措施和效果。     

480t／d液化装置设计和运行总结

介绍480t／d氧、氮液化装置的工艺流程、性能参数和主要配套设备，分析了流程设计的特点，最后阐述了有待改进的方面。     

小型天然气液化装置的研制现状与前景

介绍了小型天然气液化装置的研究背景、分析了小型液化装置在流程上的选择，综述了当前各国的研究进展，展望了小型液化装置其应用前景与经济、社会效益。     

小型氮膨胀天然气液化流程的设计及优化分析

根据气源条件,设计了3套氮膨胀天然气液化流程,选择PR(Peng-Robinson)方程进行混合物的相平衡计算,采用大型数值模拟软件Aspen Plus进行了数值模拟计算;分析比较了不同液化流程的关键热力学参数,并进行了关键设备的可行性分析.结果表明:丙烷预冷氮膨胀液化天然气流程的比功耗比无预冷的单级氮膨胀天然气液化流程的低,比无预冷的两级氮膨胀天然气液化流程的稍高,两级氮膨胀天然气液化流程较难实现.综合分析结果,选用了丙烷预冷氮膨胀液化天然气流程.     

深冷空分系统的过程模拟、优化及(用)分析

针对氧燃烧技术对氧气的特殊需求,利用ASPEN PLUS软件对一概念深冷空分系统进行了过程模拟,并对系统中的重要部件-蒸馏塔进行了设计优化.优化变量选取蒸馏塔中的3个重要参数:总级数、入流级数以及回流率.在得到空气分离过程所需的最小总级数、最小回流率的基础上利用一定的经验代数关系得到了总级数和入流级数的最优值,并依此得...     

亚太地区LPG加气机检定现状

本文主要论述了亚太地区LPG汽车的发展现状,LPG加气机的技术标准及检定条件,对LPG加气机标准表的检定过程加以阐述,并且探讨了我国LPG加气机检定存在的问题及对策.     

Incident analysis of Bucheon LPG filling station pool fire and BLEVE

An LPG filling station incident in Korea has been studied. The direct cause of the incident was concluded to be faulty joining of the couplings of the hoses during the butane unloading process from a tank lorry into an underground storage tank. The faulty connection of a hose to the tank lorry resulted in a massive leak of gas followed by catastrophic explosions. The leaking source was verified by calculating the amount of released LPG and by analyzing captured photos recorded by the television news service. Two BLEVEs were also studied.     

燃气驱动的热声发动机初步实验

在原有电驱动混合型热声发动机的基础上,设计建造了燃气驱动的混合型热声发动机,并进行了初步实验.以氮气为工质,在充气压力为1.2 MPa时发动机压比达到了1.29,在充气压力为2.4 MPa时得到了250.3 W的声功.通过采用弹性膜片阻断直流,在充气压力1.2 MPa时,系统最高压比达到1.34.     

液化石油气与二甲醚

介绍了二甲醚与液化石油气的性质,阐述了当前液化石油气中掺杂二甲醚在使用中的危害,并介绍了当前相关检验方法和标准,同时展望了二甲醚作为燃料的使用前景.     

科氏流量计在液化气贸易计量中的运用

由于液化气的组分复杂、易气化等特点,液化气动态计量一直是贸易计量工作的难点,而液化气科里奥利质量流量计就是针对液化气动态计量设计的计量器具。企业实际运用时,必须详细了解质量流量计的计量原理、要领以及选型原则和安装要点,并针对液化气的具体转输工艺条件,分析液化气各组分在其工艺条件下的饱和蒸气压,设计出一套满足自身企业液化气质量流量计计量原理的工艺流程,从而将科里奥利质量流量计成功运用到液化气动态贸易计量中。     

Effect of fire engulfment on thermal response of LPG tanks

A model has been developed to predict the thermal response of liquefied-pressure gases (LPG) tanks under fire, and three-dimensional numerical simulations were carried out on a horizontal LPG tank which was 60% filled. Comparison between numerical predictions and published experimental data shows close agreement. The attention is focused on the influence of different fire conditions (different fire scenarios, various engulfing degrees and flame temperatures) on thermal response of LPG tanks. Potential hazard probabilities under different fire conditions were discussed by analyzing the maximum wall temperature and media energy after the internal pressure rose to the same value. It is found that the less severe fire scenario and lower engulfing case may lead to a greater probability of burst hazard because of the higher maximum wall temperature and media energy before the pressure relief valve (PRV) opens.     

LPG explosion damage of a reinforced concrete building: A case study in Sanliurfa,Turkey

Around the morning EET of 17 June 2011, at Karakopru town of Sanliurfa in Turkey, a LPG explosion at a petrol station took place and as a result of this explosion 1 person was died and 21 people were seriously wounded. The in situ investigation revealed that the explosion was originated by the ignition of an explosive atmosphere that had formed at the basement space of the building due to the LPG leakage. Although it is considered the risk of LPG release to be low, the potential consequences of such a leak is devastating. In the present study, the interesting damages of RC members and their mechanisms in the building exposed to the explosion were explained in conjunction with photos and drawings. Damages observed were so interesting that, they were far beyond the imagination of anyone. It is considered that the presented damages and their mechanisms will give a new insight to the people interested in explosion damages.