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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Theoretical Foundations of Chemical Engineering</journal-id><journal-title-group><journal-title xml:lang="en">Theoretical Foundations of Chemical Engineering</journal-title><trans-title-group xml:lang="ru"><trans-title>Теоретические основы химической технологии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0040-3571</issn><issn publication-format="electronic">3034-6053</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">686530</article-id><article-id pub-id-type="doi">10.31857/S0040357125010127</article-id><article-id pub-id-type="edn">twzpek</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Cost-effective reconstruction of existing two-stream heat exchanger systems</article-title><trans-title-group xml:lang="ru"><trans-title>Экономически эффективная реконструкция существующих двухпотоковых систем теплообмена</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ulyev</surname><given-names>L. M.</given-names></name><name xml:lang="ru"><surname>Ульев</surname><given-names>Л. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tag7@tpu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gil</surname><given-names>T. A.</given-names></name><name xml:lang="ru"><surname>Гиль</surname><given-names>Т. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tag7@tpu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Norin</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Норин</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tag7@tpu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuvardina</surname><given-names>Е. V.</given-names></name><name xml:lang="ru"><surname>Кувардина</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tag7@tpu.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kondrashev</surname><given-names>D. O.</given-names></name><name xml:lang="ru"><surname>Кондрашев</surname><given-names>Д. О.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>tag7@tpu.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Research Tomsk State University</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский Томский политехнический университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">LLC Gazpromneft – Industrial Innovations</institution></aff><aff><institution xml:lang="ru">ООО “Газпромнефть – Промышленные инновации”</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-01-15" publication-format="electronic"><day>15</day><month>01</month><year>2025</year></pub-date><volume>59</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>102</fpage><lpage>117</lpage><history><date date-type="received" iso-8601-date="2025-07-01"><day>01</day><month>07</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-07-01"><day>01</day><month>07</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://transsyst.ru/0040-3571/article/view/686530">https://transsyst.ru/0040-3571/article/view/686530</self-uri><abstract xml:lang="en"><p>This paper proposes a method for optimizing a two-stream heat exchange system, taking into account the technical limitations imposed by the heat exchange equipment and cost-effectiveness of the reconstruction project. Optimization of the heat exchanger network is performed taking into account the need for industrial safety expertise in case the design temperatures for the heat exchangers are exceeded by the process flows. This method was applied to optimize energy consumption at a real hydrocracking unit. Two types of heat exchangers were considered – shell-and-tube and plate heat exchangers for possible increase of heat exchange surface area in the existing heat recovery system. For shell-and-tube heat exchangers, the minimum present value of the reconstruction project is observed when the heat exchange surface is increased by 500 m<sup>2</sup>, which corresponds to the installation of a two-section heat exchanger. It allows to reduce specific consumption of hot utilities by 51%, and cold utilities – by 31%. However, the simple payback period of such a project is ~ 1.5 years. At the same time for plate heat exchangers the minimum annual costs are observed when the heat exchange surface is increased by 400 m<sup>2</sup>. The cost of such a modernization project is 18% less than for shell-and-tube heat exchangers, and the reduction of specific consumption of hot and cold utilities is 66% and 40%, respectively.</p></abstract><trans-abstract xml:lang="ru"><p>В данной работе предложен метод для оптимизации двухпотоковой системы теплообмена, учитывающий технические ограничения, налагаемые теплообменным оборудованием, и экономическую эффективность проекта реконструкции. Оптимизация теплообменной сети производится с учетом необходимости проведения экспертизы промышленной безопасности в случае превышения расчетных температур для теплообменных аппаратов технологическими потоками. Данный метод был применен для оптимизации энергопотребления на реальной установке гидрокрекинга. Рассмотрены два типа теплообменников – кожухотрубчатые и пластинчатые для возможного увеличения площади поверхности теплообмена в существующей системе рекуперации теплоты. Для кожухотрубчатых теплообменных аппаратов минимальная приведенная стоимость проекта реконструкции наблюдается при увеличении поверхности теплообмена на 500 м<sup>2</sup>, что соответствует установке двухсекционного теплообменника. Это позволяет снизить удельное потребление горячих утилит на 51%, а холодных – на 31%. При этом простой срок окупаемости такого проекта составляет ~1.5 года. В то же время для пластинчатых теплообменных аппаратов минимальные годовые затраты наблюдаются при увеличении теплообменной поверхности на 400 м<sup>2</sup>. Стоимость такого проекта модернизации на 18% меньше, чем при использовании кожухотрубчатых теплообменников, а снижение удельного потребления горячих и холодных утилит составляет 66% и 40% соответственно.</p></trans-abstract><kwd-group xml:lang="en"><kwd>two-stream heat exchange system</kwd><kwd>reconstruction</kwd><kwd>energy efficiency</kwd><kwd>heat exchanger</kwd><kwd>optimization</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>двухпотоковая система теплообмена</kwd><kwd>реконструкция</kwd><kwd>энергоэффективность</kwd><kwd>теплообменник</kwd><kwd>оптимизация</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Статистический ежегодник мировой энергетики 2023. 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