SIMULATION OF THE INFLUENCE OF HYDROGEN ON THE COMPRESSIBILITY COEFFICIENT OF GAS-HYDROGEN MIXTURES
DOI:
https://doi.org/10.31471/1993-9981-2023-2(51)-29-38Keywords:
природний газ, компонентний склад, водень, газоводнева суміш, абсолютний тиск, температура, псевдокритична температура, псевдокритичний тиск, коефіцієнт стисливості, комп’ютерне моделювання, декарбонізація енергетичних ресурсів, об'єм газоводневої суміші.Abstract
The relevance of determining the compressibility coefficient of gas-hydrogen mixtures is considered. The expediency of developing a practical algorithm for calculating the compressibility coefficient of natural gas with different hydrogen content is substantiated. The essence of the developed three methods for determining the compressibility coefficient of gas-hydrogen mixtures when specifying the volume content of hydrogen and the component composition of natural gas with the content of carbon dioxide and nitrogen is described. The first method is based on the use of the method of composition of the components of the gas-hydrogen mixture using the basic method of calculating the compressibility coefficient NX-19 mod. The second method involves the use of a methodology based on the use of complex coefficients for reducing parameters of the working environment, which are used in the design of variable pressure drop flowmeters. The third method involves the use of the concept of component evaluation of gas composition. Each of the methods involves taking into account the volume content of hydrogen as a component of the gas-hydrogen mixture. Algorithms of the developed three methods for determining the compressibility coefficient of gas-hydrogen mixtures and numerical simulation of the change in the compressibility coefficient of gas-hydrogen mixtures with a hydrogen content of up to 30% at an absolute gas pressure of 0.3 MPa and a temperature of 15 °C are presented. A comparative analysis of three calculation algorithms was carried out. The regularities of changes in the compressibility coefficient of gas-hydrogen mixtures have been established, which relate to the growth of this coefficient by about 0.4-0.5% when the hydrogen content increases to 30% of its value in anhydrous natural gas. It is shown that the difference between the three proposed methods of calculating the compressibility coefficient does not exceed 0.2%, which means that each of these methods can be considered suitable for practical use.
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