广东地区LNG调峰对海气供应用户气质波动的影响分析  

Analysis on the influence of LNG peak-shaving in Guangdong Province on the quality fluctuation of offshore gas supply to users

作　　者：杨宏伟 刘方[1] 黄洁馨 YANG Hongwei;LIU Fang;HUANG Jiexin(CNOOC Gas&Power Group Co.,Ltd.,Beijing100028,China)

机构地区：[1]中海石油气电集团有限责任公司,北京100028

出　　处：《中国海上油气》2021年第4期186-189,共4页China Offshore Oil and Gas

基　　金：中国海洋石油集团有限公司京直地区青年科技与管理创新项目“区域天然气设施气质波动影响评价(编号:JZTW2019KJ15)”部分研究成果。

摘　　要：广东省用气保障主要通过海气登陆及陆上LNG终端气化等措施实现。由于LNG与海气的气质组分相差较大,LNG调峰供气导致的气质波动对电厂用户燃气机组平稳运行影响显著。本文以广东地区4种气源,即海气A、海气B、LNG-A、LNG-B的天然气气质组分、气质华白指数和供气能力为基础,对现有多气源混输方案进行动态仿真模拟,分析LNG调峰对电厂用户气质华白指数波动的影响,并在此基础上对现有供气方案进行优化。分析发现,混气的气质华白指数波动超出了部分电厂用户的可接受范围,主要原因是LNG-B气质组分与其他气源差异较大;采取全部由LNG-A调峰供气的优化方案后,混气气质华白指数波动在电厂用户的可接受范围之内,因而确保了电厂用户的安全生产。本文研究为广东地区天然气管网的实际运行调度提供了有效借鉴。Gas supply in Guangdong Province is mainly guaranteed by measures of submarine gas pipeline and onshore LNG terminal gasification.Due to the large difference of gas composition between LNG and offshore gas,the gas quality fluctuation caused by LNG peak shaving gas supply has a significant impact on the smooth operation of gas turbine units for power plant users.In this paper,the natural gas composition,gas quality Wobbe index and gas supply capacity of four kinds of gas sources(i.e.,offshore gas A,offshore gas B,LNG-A and LNG-B)in Guangdong Province are used to dynamically simulate the existing multi-source mixed transportation scheme and analyze the influence of LNG peak shaving on the fluctuation of gas quality Wobbe index for power plant users.On this basis,the existing gas supply scheme is optimized.It is found that the fluctuation of mixed gas Wobbe index is beyond the acceptable range for some power plant users.This is mainly because of the big composition difference between LNG-B gas and other gases;After adopting the optimized scheme of gas supply by all LNG-A peak shaving,the fluctuate of mixed gas Wobbe index comes within the acceptable range of power plant users,thus the safe production of power plant users is guaranteed.This study provides an effective support for the routine operation and dispatch of gas pipeline network in Guangdong province.

关 键 词：海气 LNG调峰 气质波动 仿真模拟 华白指数 电厂用户 

分 类 号：TE832[石油与天然气工程—油气储运工程]