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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">firesmi</journal-id><journal-title-group><journal-title xml:lang="ru">Пожаровзрывобезопасность/Fire and Explosion Safety</journal-title><trans-title-group xml:lang="en"><trans-title>Pozharovzryvobezopasnost/Fire and Explosion Safety</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0869-7493</issn><issn pub-type="epub">2587-6201</issn><publisher><publisher-name>ФГБОУ ВО «Национальный исследовательский Московский государственный строительный университет»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.22227/0869-7493.2024.33.03.5-10</article-id><article-id custom-type="elpub" pub-id-type="custom">firesmi-1376</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>ПРОЦЕССЫ ГОРЕНИЯ, ДЕТОНАЦИИ И ВЗРЫВА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>COMBUSTION, DETONATION AND EXPLOSION PROCESSES</subject></subj-group></article-categories><title-group><article-title>Максимальный размер взрывоопасных частиц аэровзвеси железа</article-title><trans-title-group xml:lang="en"><trans-title>Maximum explosive particles size of iron air suspension</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2586-8597</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Полетаев</surname><given-names>Н. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Poletaev</surname><given-names>N. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ПОЛЕТАЕВ Николай Львович, д-р техн. наук, ведущий научный сотрудник</p><p>143903, Московская обл., г. Балашиха, мкр. ВНИИПО, 12</p><p>РИНЦ AuthorID: 1093620</p></bio><bio xml:lang="en"><p>Nikolay L. POLETAEV, Dr. Sci. (Eng.), Leading Researcher</p><p>VNIIPO, 12, Balashikha, Moscow Region, 143903</p><p>RISC AuthorID: 1093620</p></bio><email xlink:type="simple">nlpvniipo@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Всероссийский ордена «Знак Почета» научно-исследовательский институт противопожарной обороны Министерства Российской Федерации по делам гражданской обороны, чрезвычайным ситуациям и ликвидации последствий стихийных бедствий</institution><country>Россия</country></aff><aff xml:lang="en"><institution>All-Russian Research Institute for Fire Protection of Ministry of Russian Federation for Civil Defense, Emergencies and Elimination of Consequences of Natural Disasters</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>28</day><month>06</month><year>2024</year></pub-date><volume>33</volume><issue>3</issue><fpage>5</fpage><lpage>10</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Полетаев Н.Л., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Полетаев Н.Л.</copyright-holder><copyright-holder xml:lang="en">Poletaev N.L.</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://www.fire-smi.ru/jour/article/view/1376">https://www.fire-smi.ru/jour/article/view/1376</self-uri><abstract><sec><title>Введение</title><p>Введение. Рассматриваются известные результаты экспериментального исследования нижнего концент­рационного предела распространения пламени (НКПР) по аэровзвесям полидисперсных образцов пыли железа в 1-м3 камере (Clouthier, Taveau, Dastidar et al., 2019) и 20-л камере (Cashdollar, 1994). Анализ этих результатов на качественном уровне, выполненный авторами данных исследований, показал, что максимальный размер dcr частиц железа, определяющих взрывоопасность аэровзвеси железной пыли, принадлежит интервалу от 30 до 75 мкм. Поставлена задача уточнить оценку dcr на основе количественного анализа результатов исследования в 1-м3 камере известным методом (Полетаев, 2014). </p><p>Выбор и обработка исходных данных. Для двух полидисперсных образцов железа с различными пределами горения в 1-м3 камере (НКПР1 = 250 г/м3 для тонкодисперсного образца и НКПР2 = 1250 … 1500 г/м3 для грубодисперсного образца) построены непрерывные функции распределения частиц по размерам: F1(d) и F2(d) соответственно. Здесь F(d) — массовая доля фракции частиц полидисперсного образца, имеющих размер менее d.</p><p>Оценка dcr и обсуждение результата. Следуя процедуре количественного метода оценки dcr, решали уравнение F1(dcr)/F2(dcr) = НКПР2/НКПР1 в наглядной графической форме. Результат решения: dcr = 36 ± 3 мкм. Полученный коли­чественный результат существенно уточнил известную качественную оценку dcr.</p></sec><sec><title>Выводы</title><p>Выводы. Способность полидисперсной аэровзвеси железной пыли распространять пламя (т.е. ее взрывоопасность) определяется содержанием мелкодисперсной фракции «менее dcr», минимальное количество которой должно превышать величину порядка 150 г/м3.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. The well-known results of experimental study of the minimum explosive concentration (MEC) polydisperse iron dust air suspension in a 1-m3 chamber (Clouthier, Taveau, Dastidar et al., 2019) and a 20-L chamber (Cashdollar, 1994) are considered. An analysis of these results at a qualitative level, carried out by the authors of these studies, showed that the maximum size of iron particles dcr responsible for the explosion hazard belongs to the range from 30 microns to 75 microns. The task is to clarify the dcr based on a quantitative analysis of the results of the study in a 1-m3 chamber by the known method (Poletaev, 2014).</p><p>Selection and processing of initial data. For two polydisperse iron specimens with different MEC in a 1-m3 chamber (MEC1 = 250 g/m3 for a fine specimen and MEC2 = 1,250 … 1,500 g/m3 for a coarse specimen), continuous particle size distribution functions are constructed: F1(d) and F2(d), respectively. Here, F(d) is the mass fraction specimen particles having size less than d.</p><p>Estimation of dcr and discussion of the result. Following the procedure of the quantitative dcr estimation method, the equation F1(dcr)/F2(dcr) = MEC2/MEC1 was solved in a visual graphical form. The result of the solution: dcr = 36 ± 3 microns. The obtained quantitative result significantly clarified the known qualitative assessment of the dcr.</p></sec><sec><title>Conclusions</title><p>Conclusions. The ability of polydisperse air suspension of iron dust to spread the flame (i.e. its explosiveness) is determined by the content of fine fraction “less than dcr”. The minimum amount of this fraction should exceed the value of about 150 g/m3.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>порошок железа</kwd><kwd>мелкая фракция</kwd><kwd>взрыв пыли</kwd><kwd>1-м3 камера</kwd><kwd>нижний концентрационный предел распространения пламени (НКПР)</kwd></kwd-group><kwd-group xml:lang="en"><kwd>iron powder</kwd><kwd>fine fraction</kwd><kwd>dust explosion</kwd><kwd>1-m3 chamber</kwd><kwd>minimum explosive concentration (MEC)</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">Bergthorson J.M. Recyclable metal fuels for clean and compact zero-carbon power // Progress in Energy and Combustion Science. 2018. No. 68. Рр. 169–196. DOI: 10.1016/j.pecs.2018.05.001</mixed-citation><mixed-citation xml:lang="en">Bergthorson J.M. Recyclable metal fuels for clean and compact zero-carbon power. 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