Study of unloading processes for ships transporting compressed natural gas (cng)
| Autor: | Valeriy V. Zaytsev, Andrey P. Dzhus, Aleksandr M. Susak |
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| Jazyk: | ukrajinština |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Збірник наукових праць НУК; № 3 (2015): Збірник наукових праць НУК Сборник научных трудов НУК; № 3 (2015) Collection of Scientific Publications NUS; № 3 (2015) |
| ISSN: | 2311-3405 2313-0415 |
| Popis: | The article presents the results of the study of the unloading processes in the ships equipped with the compressed natural gas transportation modules, which are made in accordance with the standard sea container dimensions. It was established that the unloading process is characterized by constant decrease of gas pressure in the tanks and the flow rate of gas that flows out of them. The maximum speed of the process is achieved due to maintaining the critical mode of gas flow. The nature of the gas pressure variation in the module containers at its unloading through the control devices of a 20 mm diameter and more are identical and determined by the parameters of pipelines which connect the tanks. The «alternating discharge» principle was proved inexpedient at the need of ensuring high speeds of small-capacity ships unloading, as it reduces the operating temperature beyond the values allowable for all types of cylinders. The cylinders of the combined type are made of materials which have thermal conductivity coefficients varying by hundreds of times. When using them, the existence of such rates and levels of the temperature reduction will contribute to expansion of the sliding surfaces or to a complete detachment of the elements of the combined design. The obtained results are noteworthy in the design of cargo systems of the marine means of the compressed natural gas transportation. They can also be applied as the basis for completing individual blocks under the conditions of using the CNG modules offered by global manufacturers. With these results, it is possible to substantiate the modes of unloading of marine means of transport according to the conditions of individual projects realization. For a more profound analysis of existing processes and their impact on the stress-strain state of the high-pressure tanks and those of the combined type in particular, further study of the gas temperature change till the complete ship unloading is required. Наведено результати дослідження процесів розвантаження суден, обладнаних модулями для транспортування стиснутого природного газу, які виконуються за розмірами стандартного морського контейнера. Встановлено характер зміни тиску і температури газу в ємностях модуля за різних швидкостей реалізації процесу. Обґрунтовано недоцільність дотримання принципу «почергового спорожнення» при великих швидкостях розвантаження суден. |
| Databáze: | OpenAIRE |
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