Fetisov Vadim
Department of Petroleum Engineering, Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russia.
Sci Rep. 2024 May 8;14(1):10605. doi: 10.1038/s41598-024-61361-3.
This study presents a mathematical model to evaluate the performance of gas pipelines during hydrogen injection in a gas pipeline-compressor station. The developed model presents the calculation of methane-hydrogen mixture (CH/H) transportation through the compressor station, where the compensation of pressure drops in the mass and energy balance takes place. Simultaneously, in the operation of the centrifugal blower system of gas compressor stations, the emissions of CO are considered, considering the mixing of gas media and the compression of CH/H. This mathematical model is realized for the pipeline transportation of hydrogen, at which the principle of mixture expansion occurs. The aim is to solve the problem of CO emissions at compressor stations. The optimization procedure has been formulated using a system of nonlinear algebraic equalities. The research focuses on the adaptation of existing gas transportation systems to CH/H transportation and the impact of environmental risks on the operation of compressor station equipment. In this case, it is possible to determine the quantitative amount of hydrogen that can be added to natural gas. By solving the problem of finding the inner point of sets using the system of nonlinear algebraic equalities, it is possible to obtain the control parameters for safety control of technological modes of CH/H mixture transportation. The study findings reveal that the consumption of gas charger and hydrogen was 50.67 and 0.184 kg/s, respectively, and the estimated efficiency resulting from the modified turbine design was 75.1 percent. These results indicate that the equipment operates more efficiently when hydrogen is being transported. The numerical analytical results indicated in this study hold practical significance for design applications. It will assist in identifying and evaluating the restrictions that may develop during the technological, operational, and design stages of decision-making.
本研究提出了一个数学模型，用于评估在天然气管道 - 压缩机站注入氢气期间天然气管道的性能。所开发的模型给出了甲烷 - 氢气混合物（CH/H）通过压缩机站的输送计算，其中在质量和能量平衡中进行压力降补偿。同时，在天然气压缩机站离心式鼓风机系统的运行中，考虑到气体介质的混合和CH/H的压缩，对一氧化碳的排放进行了考量。该数学模型是针对氢气的管道输送实现的，在此过程中发生混合物膨胀原理。目的是解决压缩机站的一氧化碳排放问题。利用非线性代数等式系统制定了优化程序。研究重点在于现有天然气输送系统对CH/H输送的适应性以及环境风险对压缩机站设备运行的影响。在这种情况下，可以确定可添加到天然气中的氢气定量。通过使用非线性代数等式系统解决寻找集合内点的问题，可以获得CH/H混合物输送工艺模式安全控制的控制参数。研究结果表明，气体充注器和氢气的消耗量分别为50.67和0.184千克/秒，改进后的涡轮机设计产生的估计效率为75.1%。这些结果表明，输送氢气时设备运行更高效。本研究中给出的数值分析结果对设计应用具有实际意义。它将有助于识别和评估在技术、运营和设计决策阶段可能出现的限制。
