RU2020121187A - Способ сжижения потока природного газа, содержащего азот - Google Patents

Способ сжижения потока природного газа, содержащего азот Download PDF

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RU2020121187A
RU2020121187A RU2020121187A RU2020121187A RU2020121187A RU 2020121187 A RU2020121187 A RU 2020121187A RU 2020121187 A RU2020121187 A RU 2020121187A RU 2020121187 A RU2020121187 A RU 2020121187A RU 2020121187 A RU2020121187 A RU 2020121187A
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stream
cooled
natural gas
cooling mixture
nitrogen
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RU2020121187A
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RU2797474C2 (ru
RU2020121187A3 (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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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
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    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
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    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
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    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
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    • F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
    • F25J3/0209—Natural gas or substitute natural gas
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    • F25J3/0257—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of nitrogen
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Claims (22)

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 (C0) 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 (38) пара, обогащенного азотом;
этап c): по меньшей мере частичная конденсация потока (38) 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 (21') жидкости и поток (21) газа, обогащенного азотом;
отличающийся тем, что по меньшей мере часть потока (31) жидкости, полученного на этапе b), используют на этапе c) для охлаждения потока пара, 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 непрямого теплообмена с по меньшей мере одной первой охлаждающей смесью с получением охлажденного природного газа и второй охлажденной охлаждающей смеси, а затем охлажденный природный газ конденсируют и охлаждают посредством непрямого теплообмена со второй охлажденной охлаждающей смесью и с по меньшей мере некоторым количеством потока газа, полученного на этапе d), с получением сжиженного природного газа.
3. Способ по любому из предыдущих пунктов, отличающийся тем, что до этапа b) поток, полученный на этапе a), охлаждают в средстве для повторного испарения указанной колонны для деазотизации до температуры T2.
4. Способ по предыдущему пункту, отличающийся тем, что поток, охлажденный до температуры T2, расширяют в приспособлении для расширения до введения в колонну для деазотизации.
5. Способ по одному из предыдущих пунктов, отличающийся тем, что по меньшей мере часть потока (21') жидкости, полученного на этапе d), используют в качестве возвратного потока в верхней части колонны для деазотизации.
6. Способ по одному из предыдущих пунктов, отличающийся тем, что он включает следующие этапы:
этап e): часть (32) потока (34) жидкости, полученного на этапе b), который не используют на этапе c), охлаждают посредством непрямого теплообмена со второй газообразной фракцией (41), полученной на этапе f), с получением охлажденной жидкой фракции (33) и второй нагретой газообразной фракции (42);
этап f): охлажденную жидкую фракцию (33), полученную на этапе e), расширяют, а затем ее вводят во вторую емкость (B1) разделения фаз с получением сжиженного природного газа и второй газообразной фракции (41),
этап g): по меньшей мере часть указанной второй нагретой газообразной фракции (42) сжимают до давления P1.
7. Способ по одному из предыдущих пунктов, отличающийся тем, что содержание азота в потоке газа, обогащенном азотом, полученном на этапе d), составляет более 30 мол.%.
8. Способ по одному из предыдущих пунктов, отличающийся тем, что T1 составляет от -140°C до -120°C.
9. Способ по одному из пп. 6-8, отличающийся тем, что P2 составляет от 3 бар абсолютного давления до 10 бар абсолютного давления, P1 составляет от 4 МПа до 7 МПа.
10. Способ по одному из пп. 2-9, отличающийся тем, что на этапе b) смесь природного газа и вторую охлаждающую смесь охлаждают до температуры от -70°C до -35°C посредством теплообмена с первой охлаждающей смесью.
11. Способ по предыдущему пункту, отличающийся тем, что первая охлаждающая смесь содержит в качестве мольной доли следующие компоненты, %:
этан от 30 до 70 пропан от 30 до 70 бутан от 0 до 20
12. Способ по любому из пп. 10 и 11, отличающийся тем, что вторая охлаждающая смесь содержит в качестве мольной доли следующие компоненты, %:
азот от 0 до 20 метан от30 до 70 этан от 30 до 70 пропан от 0 до 10
RU2020121187A 2017-12-21 2018-12-17 Способ сжижения потока природного газа, содержащего азот RU2797474C2 (ru)

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FR1762736 2017-12-21
FR1762736A FR3075940B1 (fr) 2017-12-21 2017-12-21 Procede de liquefaction d'un courant de gaz naturel contenant de l'azote
PCT/FR2018/053334 WO2019122656A1 (fr) 2017-12-21 2018-12-17 Procédé de liquéfaction d'un courant de gaz naturel contenant de l'azote

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RU2020121187A true RU2020121187A (ru) 2021-12-27
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