基于变压吸附制氮系统的BOG再冷凝工艺

发布时间：2018-06-10 10:32

本文选题：LNG接收站 + BOG处理　；参考：《天然气工业》2017年12期

【摘要】：为了解决LNG接收站在低输量工况下闪蒸气(Boil-Off Gas,以下简称BOG)回收不完全的问题,在不增加冷凝工艺复杂性的前提下,基于现有设备的实际工况及工艺流程,以热力学原理、静态仿真计算结果为依据,在传统的蓄冷式BOG冷凝方案的基础上,结合LNG冷能利用方式,提出了一种基于LNG接收站制氮系统的蓄冷回收BOG新工艺,并进行了BOG温度、冷凝器入口压力、LNG组分等参数的敏感性分析,明确了新工艺的适用条件。运用效果表明:(1)新工艺充分利用了LNG接收站的现有设备,每年可为LNG接收站节能创收近160万元;(2)新工艺可实现高负荷下的BOG冷凝,其冷凝外输工艺可作为辅助冷凝工艺,冷凝回罐工艺可作为应急工艺——液氮用于蓄冷、气氮用于吹扫,可满足接收站的多种需求;(3)较之于前人提出的4种BOG处理工艺(多级压缩、级间冷却、预冷和透平回收轴功),新工艺在对外输量的依赖性、流程安全性及操作性等方面均有优势。结论认为:新工艺在设备投资、能耗、工艺安全性及经济效益上都具有明显的优势,值得推广应用。
[Abstract]:In order to solve the problem that the recovery of LNG receiving station is incomplete under the condition of low flow rate, the recovery of LNG receiving station is incomplete. Based on the actual working condition and technological process of the existing equipment, the thermodynamic principle is used to solve the problem of incomplete recovery of LNG receiving station without increasing the complexity of the condensing process. Based on the static simulation results, based on the traditional cold storage bog condensing scheme and the LNG cold energy utilization mode, a new cold storage and recovery (bog) process based on LNG receiving station nitrogen production system is proposed, and the bog temperature is carried out. The sensitivity analysis of the inlet pressure and LNG components of condenser has determined the suitable conditions of the new process. The application results show that the new process makes full use of the existing equipment of the LNG receiving station and can generate nearly 1.6 million yuan per year for energy saving of the receiving station. The new process can realize the bog condensation under high load, and the condensing process can be used as the auxiliary condensing process. The condensing back tank process can be used as an emergency process-liquid nitrogen for cold storage, gas nitrogen for purging, and can meet various needs of receiving station. Compared with the previous four kinds of bog treatment processes (multistage compression, interstage cooling, etc.), Precooling and turbine recovery of shaft work, the new process in the external volume dependence, process safety and operational advantages. The conclusion is that the new process has obvious advantages in equipment investment, energy consumption, process safety and economic benefit, and is worth popularizing and applying.
【作者单位】：长江大学石油工程学院;中国石油辽河油田公司SAGD开发项目管理部;
【基金】：中国石油科技创新基金(编号:2015D-5006-0603) 国家自然科学基金(编号:51306022) 长江青年科技创新团队基金(编号:2015cqt01)
【分类号】：TE86

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