夹点分析优化后的油田联合站分布式能源系统特征与节能潜力

Characteristics and energy-saving potential of a distributed energy system in the oilfield joint station based on pinch analysis

胜利油田进入特高含水期,开采难度加大,采油成本上升,节能已成为采油厂成本控制的主要因素,采用燃气轮机或燃气内燃机发电、烟气驱动热泵回收污水余热和加热原油等工艺相结合,可以构建基于天然气的分布式能源系统。通过对传统联合站以及联合站分布式能源系统进行夹点分析,从而实现能流分析优化。基于燃气内燃机变工况能流模型,通过热力模拟进行燃气内燃机的燃烧计算,对水套加热炉加热原油的传统联合站进行夹点分析。基于烟气余热驱动的溴化锂吸收式热泵能流模型,对联合站分布式能源系统进行夹点分析。对联合站分布式能源系统与传统联合站进行了对比分析,联合站分布式能源系统节能潜力达24%,为实现“双碳”目标做出了贡献。

Currently, Shengli Oilfield has entered the period of ultrahigh water cut, thereby increasing the difficulty of exploitation and raising the cost of oil production. Energy conservation has become the main factor for controlling the cost of oil-production plants. The distributed energy system based on natural gas can be constructed by combining gas turbine or gas internal combustion engine for power generation and flue gas-driven heat pump for the recovery from sewage and heating crude oil. Energy-flow analysis and optimization can be achieved through pinch analysis of a traditional joint station and a joint station distributed energy system. Based on the energy-flow model of a gas internal combustion engine under variable working conditions, the combustion calculation of a gas internal combustion engine is performed via thermal simulation and the pinch analysis is conducted for a traditional joint station that heats crude oil via water jacket heating furnace. Based on the lithium bromide-absorption heat pump energy-flow model driven via flue-gas heat, the pinch point analysis is conducted for the distributed energy system of the joint station. A comparative analysis of the joint station distributed energy system and the traditional joint station is performed. The energy-saving potential of the joint station distributed energy system can reach 24%, contributing to the realization of the “carbon peaking and carbon neutrality” goal.