利用常温压缩机处理LNG接收站BOG的工艺探讨

doi:10.11949/j.issn.0438-1157.20181153

摘要/Abstract

摘要：

液化天然气（LNG）接收站运行过程中会产生一定量的蒸发气（BOG），目前常用火炬、压缩、再冷凝三种工艺来处理BOG。由于BOG温度较低，压缩工艺中普遍采用的是低温压缩机。然而低温压缩机造价十分昂贵，极大地降低了LNG接收站的经济效益。为此，提出了一种利用常温压缩机处理BOG的工艺。该工艺利用压缩机出口的高温BOG来加热压缩机进口处的低温BOG，一方面提高了压缩机进口温度，使得常温压缩机代替低温压缩机成为可能；另一方面，降低了压缩机出口BOG的温度，减少了BOG再冷凝所需冷量。借助HYSYS软件对低温压缩和常温压缩工艺进行了模拟分析，结果表明对于小型LNG接收站，常温压缩机工艺更有优势。

Abstract:

A certain amount of boil-off gas (BOG) will be produced during the operation of LNG receiving station. At present, three processes of torch, compression and re-condensation are commonly used to process BOG. Due to the low temperature of BOG, the cryogenic compressor is widely used in the compression process. However, the cost of cryogenic compressor reduces the economic benefits of LNG receiving station. Therefore, this paper proposes a process for BOG treating using a normal temperature compressor. The process utilizes the high temperature BOG of the compressor outlet to heat the low temperature BOG at the inlet of the compressor. On the one hand, the inlet temperature of the compressor is increased, which makes it possible for the normal temperature compressor to replace the cryogenic compressor; on the other hand, the BOG temperature at the outlet of the compressor and the cooling capacity required for the BOG re-condensation is reduced. Both cryogenic temperature compression and normal temperature compression process are simulated by HYSYS software. The results show that the normal temperature compressor process is more advantageous for small LNG receiving stations.

中图分类号:

TQ519

熊晓俊, 何婷, 林文胜. 利用常温压缩机处理LNG接收站BOG的工艺探讨[J]. 化工学报, 2018, 69(S2): 425-430.

XIONG Xiaojun, HE Ting, LIN Wensheng. Process of BOG treating in LNG receiving station with normal temperature compressor[J]. CIESC Journal, 2018, 69(S2): 425-430.

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