2411-3336 2541-9404 Записки Горного института Journal of Mining Institute Санкт-Петербургский горный университет императрицы Екатерины ΙΙ Empress Catherine II Saint Petersburg Mining University 10.18454/pmi.2017.3.342 pmi-11085 https://pmi.spmi.ru/pmi/article/view/11085 Электромеханика и машиностроение Electromechanics and mechanical engineering The influence of salinity of fly ash mixtures on energy looses during flow in pipelines Влияние солености гидросмеси зольной пыли на потери энергии при гидротранспорте по трубам Sobota I. Собота И. Sobota I. jerzy.sobota@up.wroc.pl Университет экологии и биологии (Вроцлав, Польша) Wroclaw University of Environmental and Life Sciences (Wroclaw, Poland) 23 06 2017 2017 225 342 345 28 12 2016 06 03 2017 23 06 2017 © I. Sobota 2017 И. Собота I. Sobota CC BY 4.0 https://pmi.spmi.ru/pmi/article/view/11085

На польских шахтах для закладки выработанного пространства используются гидросмеси из зольной пыли. В последние годы для приготовления смеси используют минерализованную шахтную воду, которая не содержит поверхностные воды. Использование соленой воды для приготовления смеси из зольной пыли приводит к потерям энергии во время движения потока в трубопроводе. В статье представлены результаты измерений потерь энергии, полученные при проведении лабораторных экспериментов в трубопроводе диаметром D = 50 мм. Измерения проводились для различных составов зольной пыли и соленой воды. Протестированная зольная пыль для приготовления смеси закладки поступала из ТЭЦ Siersza и имела свои особенности (гранулометрический состав и плотность). Установлено, что увеличение солености жидкости (воды) изменяет ее вязкость. Рассол по сравнению с чистой водой характеризуется повышенной вязкостью, которая влияет на свойства смеси зола-рассол, вызывая эффект флокуляции. Также изменение солености смеси влияет на величину коэффициента сопротивления (трения) λ при течении потока в трубопроводе. Увеличение концентрации зольной пыли в смеси приводит к увеличению потерь энергии.

In Polish mining for backfilling the fly ash mixtures are used. Last time for fly ash mixtures preparation the saline water from mine have been used, to thanks to that the saline water missing the surface waters. Usage of saline water for fly ash mixture preparation causes the changes in energy looses during the flow in pipelines. The paper presents the results of energy looses measurement іn laboratory pipeline installation with diameter D =50 mm. The measurements have been performed for different fly ash – saline water proportions. Tested fly-ash from Siersza power plant has typical properties (grain size distribution curve, density) for ashes used for backfilling mixtures preparation. Increase of fluid (water) salinity modifies fluid viscosity. Brine in comparison with pure water retains as liquid with increased viscosity. Increased viscosity can influence on the mixture ash-brine properties for example causing flocculation effect. Also changeable salinity has an influence on proper determination of resistance (frictional) coefficient λ during mixtures flow in pipelines because it depends on Reynolds number which depends on liquid viscosity. Increase of fly-ash concentrations in fly-ash – brine mixtures cause increase of energy losses.

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