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首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering 2007(OMAE2007) vol.2; 20070610-15; San Deigo,CA(US) >SAFETY AND ENVIRONMENTAL CHALLENGES IN DEVELOPING A CLOSED-CIRCUIT LNG REGASIFICATION SYSTEM FOR OFFSHORE NATURAL GAS EXPORT
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SAFETY AND ENVIRONMENTAL CHALLENGES IN DEVELOPING A CLOSED-CIRCUIT LNG REGASIFICATION SYSTEM FOR OFFSHORE NATURAL GAS EXPORT

机译：开发海上天然气出口闭路液化天然气再认证系统的安全和环境挑战

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摘要

This study examined the safety and environmental issues encountered in the course of development of a closed-circuit LNG regasification system to be installed on offshore LNG terminals or regasification shuttles. Restriction on sea water usage as the heating medium intrinsically determined that the developed system should be based on a closed circuit assisted by steam-generating boilers. Care were taken in establishing the operation and control philosophy, not to generate any residual steam that needed inevitably to be condensed with sea water or to be vented to the atmosphere. One of the most critical hazards was the huge amount of blowdown gas in case of emergency shutdown. It was found that the discharge through a vent mast still left a considerable risk due to the gas dispersion around the facility. Instead, a restricted blowdown to the LNG containment system or a combustion unit resulted in a less risk with a prolonged duration. Rigorous studies were performed to quantify the risks and to anticipate the system behavior. The leak and fire risk analysis indicated that the system had significantly low frequency of fire and explosion compared with usual offshore facilities. However, any guidelines were not available to assess the risk quantitatively. The process dynamic simulation suggested how the system should be shut down. This study showed that several critical challenges were solved successfully and the risk level of the closed-circuit regasification system was acceptable.
机译：这项研究检查了在开发安装在海上LNG接收站或再气化航天飞机上的闭路LNG再气化系统过程中遇到的安全和环境问题。对海水作为加热介质的限制从根本上决定了所开发的系统应基于由蒸汽锅炉辅助的闭路系统。在建立操作和控制原理时要格外小心，不要产生不可避免地需要与海水凝结或排放到大气中的任何残留蒸汽。最严重的危害之一是在紧急关闭时大量的排污气。已经发现，由于设施周围的气体扩散，通过排气门杆进行的排放仍然留下了相当大的风险。取而代之的是，对LNG密闭系统或燃烧单元的排污受到限制，从而降低了风险，延长了使用寿命。进行了严格的研究以量化风险并预测系统行为。泄漏和火灾风险分析表明，与通常的海上设施相比，该系统的火灾和爆炸发生频率明显较低。但是，尚无任何指导方针可用于定量评估风险。过程动态仿真建议应如何关闭系统。这项研究表明，成功解决了几个关键挑战，闭路再气化系统的风险水平是可以接受的。

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