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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">News of the Kabardino-Balkarian Scientific Center of the Russian Academy of Sciences</journal-id><journal-title-group><journal-title xml:lang="en">News of the Kabardino-Balkarian Scientific Center of the Russian Academy of Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Известия Кабардино-Балкарского научного центра РАН</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1991-6639</issn><issn publication-format="electronic">2949-1940</issn></journal-meta><article-meta><article-id pub-id-type="publisher-id">306162</article-id><article-id pub-id-type="doi">10.35330/1991-6639-2025-27-3-73-87</article-id><article-id pub-id-type="edn">JADOFM</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Автоматизация и управление технологическими процессами и производствами</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Automation and control of technological processes and productions</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">Simulation modeling of black liquor combustion subsystem in a recovery boiler furnace</article-title><trans-title-group xml:lang="ru"><trans-title>Имитационное моделирование подсистемы сжигания черного щелока в топке содорегенерационного котлоагрегата</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0668-8593</contrib-id><contrib-id contrib-id-type="spin">3884-5685</contrib-id><name-alternatives><name xml:lang="ru"><surname>Ковалёв</surname><given-names>Д. А.</given-names></name><name xml:lang="en"><surname>Kovalev</surname><given-names>D. A.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="ru"><p>канд. техн. наук, доцент, зав. кафедрой автоматизации технологических процессов и производств</p></bio><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor, Head of the Department of Automation of technological processes and productions</p></bio><email>d.a.kovalyov@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="ru">Высшая школа технологии и энергетики, Санкт-Петербургский государственный университет промышленных технологий и дизайна</institution></aff><aff><institution xml:lang="en">Higher School of Technology and Power Engineering, Saint Petersburg State University of Industrial Technology and Design</institution></aff></aff-alternatives><content-language>ru</content-language><pub-date date-type="pub" iso-8601-date="2025-10-21" publication-format="electronic"><day>21</day><month>10</month><year>2025</year></pub-date><pub-date date-type="collection"><year>2025</year></pub-date><volume>27</volume><issue>3</issue><issue-title xml:lang="en">VOL 27, NO3 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 27, №3 (2025)</issue-title><fpage>73</fpage><lpage>87</lpage><history><date date-type="received" iso-8601-date="2025-08-25"><day>25</day><month>08</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Kovalev D.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Ковалёв Д.А.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Kovalev D.A.</copyright-holder><copyright-holder xml:lang="ru">Ковалёв Д.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rcsi.science/1991-6639/article/view/306162">https://journals.rcsi.science/1991-6639/article/view/306162</self-uri><abstract xml:lang="en"><p>A simulation model of the subsystem for black liquor burning in the recovery boiler furnace has been developed to effectively address problem of obtaining target products resulted from black liquor combustion – sodium carbonate and sodium sulfide. The model developed enables the following processes to be simulated: black liquor combustion: to study influence of black liquor composition, air flow rate, temperature and other factors on the recovery boiler efficiency; sodium sulfate reduction: to study the influence of temperature, gas composition and carbon content on the rate of sodium sulfate reduction to sodium sulfide in the recovery boiler. Application of the simulation model allows optimizing the combustion process, minimizing pollutants emitted into the air, diminishing the use of resources and the generation of waste, and increasing the overall efficiency of the regenerative cycle.</p></abstract><trans-abstract xml:lang="ru"><p>Для решения задачи получения целевых продуктов сжигания черного щелока в топке СРК – карбоната и сульфида натрия – выполнена разработка имитационной модели подсистемы сжигания черного щелока в топке СРК. Разработанная имитационная модель подсистемы сжигания черного щелока в топке СРК даст возможность моделировать процессы: горения черного щелока – для изучения влияния различных факторов (состав черного щелока, расход воздуха, температура) на эффективность сжигания и тепловую мощность СРК; восстановления сульфата натрия – для изучения влияния температуры, состава газов и содержания углерода на скорость восстановления сульфата натрия до сульфида натрия в СРК. Применение имитационной модели подсистемы сжигания черного щелока в топке СРК позволит оптимизировать процесс сжигания, минимизировать выбросы загрязняющих веществ в атмосферу, снизить потребление ресурсов и отходов, а также повысить общую эффективность процессов регенерационного цикла.</p></trans-abstract><kwd-group xml:lang="en"><kwd>recovery boiler</kwd><kwd>simulation model of recovery boiler</kwd><kwd>black liquor combustion subsystem</kwd><kwd>pyrolysis zone</kwd><kwd>oxidation zone</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>содорегенерационный котлоагрегат</kwd><kwd>имитационная модель СРК</kwd><kwd>подсистема сжигания черного щелока</kwd><kwd>зона пиролиза</kwd><kwd>окислительная зона</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Almeida G.J., Vakkilainen G., Laryshyn E. et al. 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