储气库压差发电嵌入方式与工艺模拟分析

Simulation and analysis of embedding modes and processes for differential pressure power generation in gas storage reservoirs

关键词:  储气库  压差发电  工艺仿真  发电功率  嵌入方式

Key words:  gas storage reservoir  differencial pressure power generation  process simulation  power generation rate  embedding mode

摘要:

目的 探索并推动储气库天然气压差发电技术的规模化应用，促进储气库向低碳发展模式转型，同时弥补国内在压差发电机组嵌入储气库可行性分析方面的不足。方法 围绕储气库天然气压差发电注采流程，分析压差发电在储气库中的嵌入方式，建立注采站单台、注采站双台、井口、井场及联合发电共5种嵌入方式下压差发电工艺仿真模型，同时分析天然气压差发电影响因素、降压运行方式、分流运行方式与不同嵌入方式下压差发电运行结果及参数变化情况。结果 针对注采站单台嵌入方式，为保障机组安全运行，可以采用分流运行方式控制进气流量，或降压运行方式对进气压力进行控制；双台嵌入方式可完全回收注采站压力能；井场嵌入方式仅比井口嵌入方式减少发电功率251.88 kW，约3.4 %。结论 该研究有利于了解嵌入方式对储气库系统低碳运行的影响，明确不同嵌入方式的优劣性，平衡嵌入压差发电的储气库系统运行碳排放量与机组的嵌入数量，对储气库嵌入压差发电机组项目的规划建设具有指导意义。

Abstract:

Objective This paper aims to explore and facilitate the large-scale application of natural gas differential pressure power generation technology in gas storage reservoirs, facilitating the transition to a low-carbon development model for gas storage reservoirs, it also addresses the current gap in China regarding the feasibility analysis of embedding differential pressure generator sets into gas storage reservoirs. Method This paper focused on the natural gas reservoir differential pressure power generation injection and extraction process, analyzed the embedding modes of differential pressure power generation in the reservoirs, established the simulation models of differential pressure power generation processes under five embedding modes such as single unit in the injection and extraction station, double units in the injection and extraction station, wellhead, wellsite, and co-generation. At the same time, the simulation analyzed the influencing factors of the natural gas differential pressure power generation, the pressure reduction operation mode, the diversion operation mode, the results of the operation of the differential pressure power generation, and the parameter changes under different embedding modes. Result For the single-unit embedding mode of the injection and extraction station, in order to ensure the safe operation of the unit, diversion operation could be used to control the intake flow rate, or the intake pressure could be controlled by the pressure-reducing operation method; the double-unit embedding mode could completely recover the pressure energy of the injection and extraction station; and the wellsite embedding mode could only reduce the power generation rate by 251.88 kW, about 3.4%, compared with the wellhead embedding mode. Conclusion This study is conducive to understanding the impact of embedding modes on the low-carbon operation of the gas storage reservoirs, clarifying the advantages and disadvantages of different embedding modes, balancing the carbon emissions from the operation of the gas storage reservoirs embedded in differential pressure power generation with the number of units embedded in the system, and providing guidance for the planning and construction of the project of embedding differential pressure generating units in the gas storage reservoirs.