摘要
为降低轻烃回收工艺中CO_(2)冻堵造成的风险,提高RSV工艺对原料气中CO_(2)含量的适应程度。在梳理CO_(2)固体形成规律的基础上,通过固系物追踪验证析出固体的物流和设备,通过敏感性分析研究了不同工艺参数对冻堵裕量的影响,并针对性地提出不同序列的阶段性解冻措施。结果表明,脱甲烷塔塔顶气和干气过冷回流是容易发生CO_(2)冻堵的物流,脱甲烷第2块塔板的冻堵风险最大;脱甲烷塔塔压、低温分离器温度是影响CO_(2)冻堵裕量的最敏感因素;原料气中CO_(2)含量不同,对应的解冻措施也不同,可通过增加塔压、降低低温分离器温度等措施来控制CO_(2)固体析出;在相同乙烷收率的前提下,改进后的RSVF工艺较RSV工艺,不仅冻堵裕量有所增加,而且总能耗也有所降低。
To reduce the risk caused by CO_(2)freezing and blockage in the light hydrocarbon recovery process,the RSV process adaptation to CO_(2)content in feed gas was increased.Based on the formation pattern of CO_(2)solids,the logistics and equipment of the solids were verified through solid tracking.The influence of different process parameters on freezing and blockage margin was studied through sensitivity analysis and phased thawing measures of different sequences were proposed.It was found that the undercooling induced backflow of the top gas and the dry gas in the demethanation tower is a flow prone to CO_(2)freezing and blockage,of which the highest risk exists in the second demethanation plate.The column pressure of the demethanation tower and the temperature of the cryogenic separator are the most sensitive factors for CO_(2)freezing and blockage margin.As CO_(2)content in raw gas changes,the corresponding thawing measures vary.The solid CO_(2)precipitation can be controlled by increasing the column pressure and lowering the temperature of the cryogenic separator.Compared with the RSV process with the same ethane recovery,the improved RSVF process not only increases the freezing and blockage margin but also reduces the total energy consumption.
作者
张树伟
王文康
李政杰
王雷
张丽
刘飞
ZHANG Shuwei;WANG Wenkang;LI Zhengjie;WANG Lei;ZHANG Li;LIU Fei(Huabei Oilfield Huagang Gas Group Co.Ltd.,Renqiu 062552,China;Well Testing Branch of CNPC Bohai Drilling Engineering Co.,Ltd.,Langfang 065000,China;Bidding Center,Huabei Oilfield Company,Renqiu 062552,China)
出处
《石油工程建设》
2024年第3期60-66,共7页
Petroleum Engineering Construction
关键词
天然气
轻烃回收
CO_(2)
冻堵
敏感性分析
natural gas
light hydrocarbon recovery
CO_(2)
freezingand blockage
sensitivity analysis
