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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vdgtu</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Дагестанского государственного технического университета. Технические науки</journal-title><trans-title-group xml:lang="en"><trans-title>Herald of Dagestan State Technical University. Technical Sciences</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2073-6185</issn><issn pub-type="epub">2542-095X</issn><publisher><publisher-name>Daghestan State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21822/2073-6185-2025-52-2-27-41</article-id><article-id custom-type="elpub" pub-id-type="custom">vdgtu-1766</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ЭНЕРГЕТИКА И ЭЛЕКТРОТЕХНИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ENERGY AND ELECTRICAL ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Модификация цикла Mixed Fluid Cascade с рекуперацией теплоты обратных потоков рабочих веществ и оптимизированным давлением потока природного газа</article-title><trans-title-group xml:lang="en"><trans-title>Modification of the Mixed Fluid Cascade cycle with heat recovery of the working fluid reverse flows and optimised natural gas flow pressure</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2665-5788</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Иконникова</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Ikonnikova</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Анастасия Юрьевна Иконникова, старший лаборант, ассистент, аспирант, образовательный центр «Энергоэффективные инженерные системы»</p><p>197101, г. Санкт-Петербург, Кронверкский проспект, д. 49; 197349, г. Санкт-Петербург, Макулатурный пр., 4, литера А</p></bio><bio xml:lang="en"><p>Anastasia Yu. Ikonnikova, Senior Lab Assistant, Assistant, Postgraduate Student, Educational Center "Energy Efficient Engineering Systems"</p><p>49 Kronverksky Ave., St. Petersburg 197101; 4 Makulaturny Ave., litera A, St. Petersburg 197349</p></bio><email xlink:type="simple">aikonnikova@itmo.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9263-8153</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Баранов</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Baranov</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Александр Юрьевич Баранов, доктор технических наук, профессор, образовательный центр «Энергоэффективные инженерные системы»</p><p>197101, г. Санкт-Петербург, Кронверкский проспект, д. 49; 197349, г. Санкт-Петербург, Макулатурный пр., 4, литера А</p></bio><bio xml:lang="en"><p>Alexander Yu. Baranov, Dr. Sci. (Eng.), Prof., Educational Center "Energy Efficient Engineering Systems"</p><p>49 Kronverksky Ave., St. Petersburg 197101; 4 Makulaturny Ave., litera A, St. Petersburg 197349</p></bio><email xlink:type="simple">abaranov@itmo.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5564-9312</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кравченко</surname><given-names>Ю. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kravchenko</surname><given-names>Yu. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юлия Андреевна Кравченко, аспирант, ассистент, образовательный центр «Энергоэффективныеинженерные системы»</p><p>197101, г. Санкт-Петербург, Кронверкский проспект, д. 49; 197349, г. Санкт-Петербург, Макулатурный пр., 4, литера А</p></bio><bio xml:lang="en"><p>Yulia A. Kravchenko, Postgraduate Student, Assistant, Educational Center "Energy Efficient Engineering Systems"</p><p>49 Kronverksky Ave., St. Petersburg 197101; 4 Makulaturny Ave., litera A, St. Petersburg 197349</p></bio><email xlink:type="simple">jasolonina@itmo.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3675-5678</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кравченко</surname><given-names>Д. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kravchenko</surname><given-names>D. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Денис Владимирович Кравченко, аспирант, ассистент, образовательный центр «Энергоэффективныеинженерные системы»</p><p>197101, г. Санкт-Петербург, Кронверкский проспект, д. 49; 197349, г. Санкт-Петербург, Макулатурный пр., 4, литера А</p></bio><bio xml:lang="en"><p>Denis V. Kravchenko, Postgraduate Student, Assistant, Educational Center "Energy Efficient Engineering Systems"</p><p>49 Kronverksky Ave., St. Petersburg 197101; 4 Makulaturny Ave., litera A, St. Petersburg 197349</p></bio><email xlink:type="simple">dvkravchenko@itmo.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский университет ИТМО; ООО «НПП «КРИОН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Research University ITMO; LLC "NPP "KRION"</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>10</day><month>08</month><year>2025</year></pub-date><volume>52</volume><issue>2</issue><fpage>27</fpage><lpage>41</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Иконникова А.Ю., Баранов А.Ю., Кравченко Ю.А., Кравченко Д.В., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Иконникова А.Ю., Баранов А.Ю., Кравченко Ю.А., Кравченко Д.В.</copyright-holder><copyright-holder xml:lang="en">Ikonnikova A.Y., Baranov A.Y., Kravchenko Y.A., Kravchenko D.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestnik.dgtu.ru/jour/article/view/1766">https://vestnik.dgtu.ru/jour/article/view/1766</self-uri><abstract><p>Цель. В работе представлены результаты исследования целесообразности рекуперации теплоты обратных потоков рабочих веществ цикла Mixed Fluid Cascade. Показано положительное влияние рекуперации теплоты на величину удельных затрат энергии на получение сжиженного природного газа. Метод. Исследование выполнено в формате математического моделирования работы цикла. Исследована работа цикла Mixed Fluid Cascade в базовом и модифицированном вариантах. Для организации рекуперации теплоты перегрева обратных потоков рабочих веществ в модифицированный вариант были добавлены теплообменные аппараты, расположенные в ступенях сжижения и переохлаждения, в которых обратные потоки рабочих веществ нагревались за счет подвода теплоты от прямых потоков. Также для дополнительного повышения энергоэффективности процесса был добавлен дожимающий компрессор сырьевого потока природного газа. Результат. В численном эксперименте изучено влияние выбора значения давления сырьевого потока природного газа, степени недорекуперации теплоты в дополнительных теплообменных аппаратах, выбора варианта включения теплообменных аппаратов в цикл на величину удельных затрат энергии и массового расхода рабочих веществ в ступенях внешнего охлаждения цикла. Вывод. Результаты исследования показали возможность перераспределения тепловой нагрузки цикла в сторону высокотемпературных ступеней, а также снижение удельных затрат энергии на получение сжиженного природного газа.</p></abstract><trans-abstract xml:lang="en"><p>Objective. The paper investigates the feasibility of heat recovery from reverse flows in the Mixed Fluid Cascade cycle, highlighting its positive impact on specific energy consumption for liquefied natural gas (LNG) production. Method. The study employs mathematical modeling to analyze both the basic and modified cycle operations. The modified version incorporates heat exchangers in the liquefaction and subcooling stages, allowing reverse flows to be heated by direct flow heat. Additionally, a booster compressor for the feed natural gas flow is introduced to enhance energy efficiency. Result. The numerical experiments assess how variations in feed flow pressure, heat under-recovery in heat exchangers, and their configuration affect specific energy consumption and mass flow rates in the cycle's external cooling stages. Results indicate that thermal load can be redistributed towards high-temperature stages, leading to a reduction in specific energy consumption for LNG production. Conclusion. Overall, the research demonstrates the potential benefits of implementing heat recovery strategies in the Mixed Fluid Cascade cycle, contributing to more efficient LNG production processes.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>недорекуперация</kwd><kwd>энергоэффективность</kwd><kwd>сжиженный природный газ</kwd><kwd>повышенное давление</kwd><kwd>потери энергии</kwd></kwd-group><kwd-group xml:lang="en"><kwd>underrecovery</kwd><kwd>energy efficiency</kwd><kwd>liquefied natural gas</kwd><kwd>high pressure</kwd><kwd>energy losses</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Архаров И.А., Александров А.А., Навасардян Е.С. Теория и расчет циклов криогенных систем. 2009.</mixed-citation><mixed-citation xml:lang="en">Arkharov I.A., Aleksandrov A.A., Navasardyan E.S. Theory and calculation of cycles of cryogenic systems. S. 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