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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">Himičeskaâ fizika</journal-id><journal-title-group><journal-title xml:lang="en">Himičeskaâ fizika</journal-title><trans-title-group xml:lang="ru"><trans-title>Химическая физика</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0207-401X</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">689005</article-id><article-id pub-id-type="doi">10.31857/S0207401X25080081</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Combustion, explosion and shock waves</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Горение, взрыв и ударные волны</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">Stability of calcium sulfate at the gasification of solid fuel in the filtration mode</article-title><trans-title-group xml:lang="ru"><trans-title>Устойчивость сульфата кальция при газификации твердого топлива в фильтрационном режиме</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tsvetkova</surname><given-names>Yu. Yu.</given-names></name><name xml:lang="ru"><surname>Цветкова</surname><given-names>Ю. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>iulya@icp.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zaichenko</surname><given-names>A. Yu.</given-names></name><name xml:lang="ru"><surname>Зайченко</surname><given-names>А. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>iulya@icp.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Podlesniy</surname><given-names>D. N.</given-names></name><name xml:lang="ru"><surname>Подлесный</surname><given-names>Д. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>iulya@icp.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Salganskaya</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Салганская</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>iulya@icp.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kislov</surname><given-names>V. M.</given-names></name><name xml:lang="ru"><surname>Кислов</surname><given-names>В. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>iulya@icp.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Salgansky</surname><given-names>E. A.</given-names></name><name xml:lang="ru"><surname>Салганский</surname><given-names>Е. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>iulya@icp.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tsvetkov</surname><given-names>M. V.</given-names></name><name xml:lang="ru"><surname>Цветков</surname><given-names>М. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>iulya@icp.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Федеральный исследовательский центр проблем химической физики и медицинской химии Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-08-15" publication-format="electronic"><day>15</day><month>08</month><year>2025</year></pub-date><volume>44</volume><issue>8</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>81</fpage><lpage>86</lpage><history><date date-type="received" iso-8601-date="2025-08-11"><day>11</day><month>08</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-08-11"><day>11</day><month>08</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/0207-401X/article/view/689005">https://transsyst.ru/0207-401X/article/view/689005</self-uri><abstract xml:lang="en"><p>The regularities of SO<sub>2</sub> release from calcium sulfate during the gasification of solid fuel in the filtration combustion mode have been studied. The maximum amounts of SO<sub>2</sub> released into the gas phase under real conditions of a laboratory vertical shaft reactor have been estimated. It has been shown that the most important factors determining the stability of CaSO<sub>4</sub> are the process temperature and the amount of silicon dioxide in the inorganic part of the solid fuel.</p></abstract><trans-abstract xml:lang="ru"><p>Изучены закономерности выделения SO<sub>2</sub> из сульфата кальция при газификации твердого топлива в режиме фильтрационного горения. Оценены предельные количества SO<sub>2</sub>, выделяющегося в газовую фазу в реальных условиях лабораторного вертикального шахтного реактора. Показано, что важнейшими факторами, определяющими устойчивость CaSO<sub>4</sub>, являются температура процесса и количество диоксида кремния в неорганической части твердого топлива.</p></trans-abstract><kwd-group xml:lang="en"><kwd>sulfur dioxide</kwd><kwd>calcium sulfate</kwd><kwd>filtration combustion</kwd><kwd>thermodynamics</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>диоксид серы</kwd><kwd>сульфат кальция</kwd><kwd>фильтрационное горение</kwd><kwd>термодинамика</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Ministry of Science And Higher Education of the Russian Federation</institution></institution-wrap></funding-source><award-id>075-00247-24-00</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Banerjee A., Paul D. // Energy. 2021. 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