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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">10.22227/0869-7493.2023.32.01.51-56</article-id><article-id custom-type="elpub" pub-id-type="custom">firesmi-1195</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>БЕЗОПАСНОСТЬ ВЕЩЕСТВ И МАТЕРИАЛОВ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SAFETY OF SUBSTANCES AND MATERIALS</subject></subj-group></article-categories><title-group><article-title>Взрывоопасность аэровзвеси сухой молочной сыворотки</article-title><trans-title-group xml:lang="en"><trans-title>Explosion hazard of whey powder mixed with air</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, Всероссийский ордена «Знак Почета» научно-исследовательский институт противопожарной оборо­­ны Министерства Российской Федерации по делам гражданской обороны, чрезвычайным ситуациям и ликвидации последствий стихийных бедствий, Россия, 143903, Московская обл., г. Балашиха, мкр. ВНИИПО, 12; РИНЦ ID: 1093620</p></bio><bio xml:lang="en"><p>Nikolay L. POLETAEV, Dr. Sci. (Eng.), Leading Researcher, All-Russian Research Institute for Fire Protection of Minis­­­­try of Russian Federation for Civil Defense, Emergencies and Elimination of Consequences of Natural Disasters, VNIIPO, 12, Balashikha, Moscow Region, 143903, Russian Federation; ID RISC: 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, Московская обл., г. Балашиха, Россия</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, VNIIPO, 12, Balashikha, Moscow Region, 143903, Russian Federation</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>28</day><month>02</month><year>2023</year></pub-date><volume>32</volume><issue>1</issue><fpage>51</fpage><lpage>56</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Полетаев Н.Л., 2023</copyright-statement><copyright-year>2023</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/1195">https://www.fire-smi.ru/jour/article/view/1195</self-uri><abstract><sec><title>Введение</title><p>Введение. В нормативной литературе многих стран принято относить фракцию горючей пыли с размером частиц более 500 мкм к дисперсным материалам, невзрывоопасным в состоянии аэровзвеси. Представляет интерес изучение взрывоопасности аэровзвесей, которые не подчиняются данному правилу. В частности, известна взрывоопасность образцов сухой молочной сыворотки (далее — сыворотки) со средним размером частиц 41, 162 и 750 мкм, выявленная испытаниями в камере объемом 1 м3. Поставлена задача определить максимальный размер частиц взрывоопасной фракции сыворотки dcr с помощью ранее раз­работанной процедуры и продемонстрировать нарушение упомянутого выше правила.</p><p>Метод обработки экспериментальных данных. Для упомянутых трех образцов сыворотки с известными значениями бедного концентрационного предела взрываемости (НКПР1 = 250 г/м3, НКПР2 = 250 г/м3 и НКПР3 = 500 г/м3) построены непрерывные функции F распределения частиц по размерам d. Полученные функции F1(d), F2(d) и F3(d) соответственно представлялись распределениями Розина – Раммлера, заполняющими промежутки между дискретными данными ситового анализа образцов.</p></sec><sec><title>Оценка dcr</title><p>Оценка dcr. Следуя известной процедуре (Полетаев, 2014), использовали информацию о первом и третьем образцах сыворотки. Находили значения dcr из уравнения F1(dcr)/F3(dcr) = НКПР3/НКПР1. Решение уравнения дает dcr = 750 мкм.</p></sec><sec><title>Обсуждение результатов</title><p>Обсуждение результатов. Полученная оценка dcr намного превышает предельное значение параметра, предлагаемое в нормах. Данная оценка носит объективный характер и не может объясняться известным из практики измельчением крупных частиц в процессе распыления. В пользу последнего утверждения свидетельствует характерное снижение индекса взрывоопасности сыворотки с ростом среднего размерачастиц рассмотренных трех образцов.</p></sec><sec><title>Выводы</title><p>Выводы. Максимальный размер частиц взрывоопасной фракции сыворотки составляет величину порядка 750 мкм.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. In many countries, regulations consider combustible dust with a particle size of more than 500 μm as dispersed material non-explosive if mixed with air. The explosiveness of mixtures of air and some substance arouses researchers’ interest. In particular, the explosiveness of whey powder specimens (hereinafter referred to as whey powder) with an average particle size of 41, 162 and 750 μm, was identified in the process of their testing in a 1 m3 chamber. The task is to find out the maximum particle size of whey powder dcr using the earlier developed procedure and to demonstrate its failure to conform to the rule specified above.</p><p>Method to process experimental data. Continuous functions F of particle size distribution d were constructed for three whey powder specimens having the following values of the lower explosive limit (LEL1 = 250 g/m3, LEL2 = 250 g/m3 and LEL3 = 500 g/m3, respectively). Resulting functions F1(d), F2(d) and F3(d) were presented using Rosin – Rammler distributions that filled the gaps between the discrete data obtained as a result of the sieve analysis.</p></sec><sec><title>dcr evaluation</title><p>dcr evaluation. We used information about the first and third whey powder specimens in compliance with the well-known procedure (Poletaev, 2014). dcr values were identified using equation F1(dcr)/F3(dcr) = LEL3/LEL1. Having solved the equation, we found that dcr = 750 μm.</p></sec><sec><title>Discussion</title><p>Discussion. The obtained evaluation of dcr is much higher than the limit value of the parameter proposed in the regulations. This evaluation is of objective origin, and it cannot be explained by the grinding of large particles during the spraying process. The latter statement is supported by a characteristic decrease in the explosibility index of whey powder and an increase in the average particle size (for explosive fractions) of the three specimens in question.</p></sec><sec><title>Conclusions</title><p>Conclusions. 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