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含二氧化碳天然气三甘醇脱水工艺设计及分析
Design and analysis of triethylene glycol dehydration process for natural gas containing carbon dioxide
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- DOI:
- 10.3969/j.issn.1001-2206.2025.06.005
- 作者:
- 于爱暄, 白成玉, 常洪莉, 王婷婷, 张宇, 张一沫
YU Aixuan, BAI Chengyu, CHANG Hongli, WANG Tingting, ZHANG Yu, ZHANG Yimo
- 作者单位:
- 中国石油集团海洋工程有限公司, 北京 100028
CNPC Offshore Engineering Company Limited, Beijing 100028, China
- 关键词:
- 海上平台; 二氧化碳; 三甘醇脱水; 水合物
offshore platform;carbon dioxide;triethylene glycol dehydration;hydrate
- 摘要:
- 含二氧化碳气田的开发过程中，为避免海底管道输送天然气时形成水合物堵塞，并防止其对管道和设备造成腐蚀，脱水工艺成为关键环节之一，海洋平台多采用三甘醇脱水工艺。二氧化碳摩尔分数对三甘醇脱水工艺存在一定影响，需开展其对脱水效果及天然气水合物生成条件的影响分析，并提出工艺优化措施。基于渤海某海上天然气综合处理平台，先采用初步估算法确定三甘醇质量分数及再生方案，再利用HYSYS软件对三甘醇脱水工艺进行模拟计算，并对工艺参数进行优化；同时分析原料气二氧化碳摩尔分数对脱水效果及水合物生成的影响。结果表明：随二氧化碳摩尔分数的增加，原料气含水量升高，脱水效果降低，天然气水合物在同等压力条件下生成温度升高。针对二氧化碳摩尔分数对水合物生成条件的影响提出了相应措施，该平台自投产以来运行稳定。
In the development of carbon dioxide-containing gas fields, the dehydration process is one of the key parts to avoid the blocking of hydrates in the process of subsea pipeline natural gas transportation and the corrosion of pipelines and equipment, and the triethylene glycol dehydration process is mostly used on offshore platforms. Carbon dioxide molar fraction has a certain influence on the dehydration process of triethylene glycol. It is necessary to analyze its influence on the dehydration effect and the formation conditions of natural gas hydrate, with process optimization measures proposed. Based on an offshore natural gas integrated treatment platform in the Bohai Sea, the preliminary estimation method was used to determine the concentration and regeneration plan of triethylene glycol. The dehydration process of triethylene glycol was then simulated and calculated by HYSYS software, and the process parameters were optimized. The influence of the carbon dioxide molar fraction of the feed gas on the dehydration effect and hydrate formation was analyzed. The results show that with the higher carbon dioxide molar fraction, the water content of the raw gas increases, the dehydration effect decreases, and the formation temperature of natural gas hydrate goes up under the same pressure conditions. Corresponding measures were proposed for the effect of carbon dioxide molar fraction on formation conditions of hydrates with stable operation after production.