RU2020121255A - Способ получения чистого азота из потока природного газа, содержащего азот - Google Patents

Способ получения чистого азота из потока природного газа, содержащего азот Download PDF

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RU2020121255A
RU2020121255A RU2020121255A RU2020121255A RU2020121255A RU 2020121255 A RU2020121255 A RU 2020121255A RU 2020121255 A RU2020121255 A RU 2020121255A RU 2020121255 A RU2020121255 A RU 2020121255A RU 2020121255 A RU2020121255 A RU 2020121255A
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stream
cooled
nitrogen
natural gas
liquid
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RU2020121255A
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RU2797978C2 (ru
RU2797978C9 (ru
RU2020121255A3 (ru
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Анри Парадовски
Себастьен ЛИХТЛЕ
Мари МЮР
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Л'Эр Ликид, Сосьете Аноним Пур Л'Этюд Э Л'Эксплуатасьон Де Проседе Жорж Клод
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Claims (31)

1. Способ сжижения подаваемого потока (1) природного газа, включающий следующие этапы:
этап a): охлаждение подаваемого потока (1) газа с получением потока (10) сжиженного природного газа при температуре T1 и при давлении P1b;
этап b): введение потока, полученного на этапе a), в колонну (C1) для деазотизации при давлении P2 и при температуре T2, которая ниже T1, с получением в емкости указанной колонны деазотизированного потока (31) сжиженного природного газа и в верхней части указанной колонны потока (100) пара, обогащенного азотом;
этап c): по меньшей мере частичная конденсация по меньшей мере части (38) потока (100) пара, обогащенного азотом, полученного на этапе b), в теплообменнике (E5) с получением двухфазного потока (39);
этап d): введение двухфазного потока (39), полученного на этапе c), в емкость (B2) разделения фаз с получением по меньшей мере двух фаз, включающих поток (40) жидкости и поток (21) газа, обогащенного азотом;
этап e): введение по меньшей мере части потока (21) газа, полученного на этапе d), в дистилляционную колонну (C2) при давлении P2, получая в верхней части поток (411), обогащенный азотом, содержащий менее 1 мол. % метана, и в емкости поток (421) жидкости, содержащий менее 10 мол. % азота;
отличающийся тем, что по меньшей мере часть (34) потока (31) жидкости, полученного на этапе b), используют на этапе c) для охлаждения указанной по меньшей мере части (38) потока (100) пара, обогащенного азотом, полученного на этапе b), в указанном теплообменнике (E5).
2. Способ по предыдущему пункту, отличающийся тем, что во время выполнения этапа a) указанный подаваемый поток природного газа и вторую охлаждающую смесь охлаждают посредством косвенного теплообмена с по меньшей мере одной первой охлаждающей смесью с получением охлажденного природного газа и второй охлажденной охлаждающей смеси, и затем охлажденный природный газ конденсируют и охлаждают посредством косвенного теплообмена с по меньшей мере второй охлажденной охлаждающей смесью с получением сжиженного природного газа.
3. Способ по предыдущему пункту, отличающийся тем, что поток (411), обогащенный азотом, полученный на этапе e), содержит менее 100 молярных ppm метана, и поток (421) жидкости, полученный на этапе e), содержит менее 4 мол. % азота.
4. Способ по предыдущему пункту, отличающийся тем, что до этапа b) поток, полученный на этапе a), охлаждают в приспособлении для повторного испарения указанной колонны для деазотизации до температуры T2.
5. Способ по предыдущему пункту, отличающийся тем, что поток, охлажденный до температуры T2, расширяют в приспособлении для расширения до введения в колонну для деазотизации.
6. Способ по одному из пп. 3-5, отличающийся тем, что по меньшей мере часть потока (40) жидкости, полученного на этапе d), используют в качестве возвратного потока в верхней части колонны для деазотизации.
7. Способ по одному из пп. 3-6, отличающийся тем, что он включает следующие этапы:
этап f): часть потока жидкости, полученного на этапе b), которую не используют на этапе c), охлаждают посредством косвенного теплообмена со второй газообразной фракцией, полученной на этапе g), с получением охлажденной жидкой фракции и второй нагретой газообразной фракции;
этап g): охлажденную жидкую фракцию, полученную на этапе f), расширяют и затем ее вводят во вторую емкость (B1) разделения фаз с получением сжиженного природного газа и второй газообразной фракции;
этап h): по меньшей мере часть второй нагретой газообразной фракции, полученной на этапе g), сжимают до давления P1;
этап i): по меньшей мере часть потока жидкости, полученного на этапе e), охлаждают посредством косвенного теплообмена;
этап j): поток, полученный на этапе i), смешивают с расширенной смесью, полученной на этапе g), до введения в указанную вторую емкость (B1) разделения фаз.
8. Способ по одному из пп. 3-7, отличающийся тем, что содержание азота в потоке газа, обогащенном азотом, полученном на этапе e), составляет более 50 мол. %.
9. Способ по одному из пп. 3-8, отличающийся тем, что T1 составляет от -140 °C до -120 °C.
10. Способ по одному из пп. 3-9, отличающийся тем, что P2 составляет от 3 бар абсолютного давления до 10 бар абсолютного давления.
11. Способ по одному из пп. 3-10, отличающийся тем, что на этапе a) смесь природного газа и вторую охлаждающую смесь охлаждают до температуры от -70 °C до -35 °C посредством теплообмена с первой охлаждающей смесью.
12. Способ по предыдущему пункту, отличающийся тем, что первая охлаждающая смесь содержит в качестве мольной доли следующие компоненты:
o этан: от 30% до 70%
o пропан: от 30% до 70%
o бутан: от 0% до 20%.
13. Способ по любому из пп. 11 и 12, отличающийся тем, что вторая охлаждающая смесь содержит в качестве мольной доли следующие компоненты:
o азот: от 0% до 20%
o метан: от 30% до 70%
o этан: от 30% до 70%
o пропан: от 0% до 10%.
RU2020121255A 2017-12-21 2018-12-17 Способ получения чистого азота из потока природного газа, содержащего азот RU2797978C9 (ru)

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FR1762735 2017-12-21
FR1762735A FR3075939B1 (fr) 2017-12-21 2017-12-21 Procede de production d'azote pur a partir d'un courant de gaz naturel contenant de l'azote
PCT/FR2018/053332 WO2019122654A1 (fr) 2017-12-21 2018-12-17 Procédé de production d'azote pur à partir d'un courant de gaz naturel contenant de l'azote

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