probenerИзвестия высших учебных заведений. ПРОБЛЕМЫ ЭНЕРГЕТИКИPower engineering: research, equipment, technology1998-99032658-5456Kazan State Power Engineering University10.30724/1998-9903-2019-21-5-110-123probener-1110Research ArticleЭНЕРГЕТИКАPOWER ENGINEERINGЭкспериментальные исследования влияния давления суспензионного топлива и воздуха на структуру факела в процессе распылаExperimental studies of the influence of pressure of slurry fuel and air on the spray cone structure during atomizationГвоздяковД. B.GvozdyakovD. V.

Гвоздяков Дмитрий Васильевич – доцент НОЦ И.Н. Бутакова

г. Томск

Dmitry V Gvozdyakov 

Tomsk

dim2003@tpu.ruЗенковА. В.ZenkovA. V.

Зенков Андрей Викторович – ассистент НОЦ И.Н. Бутакова

г. Томск

Andrey V Zenkov 

Tomsk

avz41@tpu.ruГубинВ. Е.GubinV. E.

Губин Владимир Евгеньевич – доцент НОЦ И.Н. Бутакова

г. Томск

Vladimir E Gubin 

Tomsk

gubin@tpu.ruВедяшкинМ. В.VedyashkinM. V.

Ведяшкин Максим Викторович – доцент Отделения контроля и диагностики

г. Томск

Maxim V Vedyashkin 

Tomsk

vedyashkin@tpu.ruНациональный Исследовательский Томский Политехнический университетРоссияNational Research Tomsk Polytechnic UniversityRussian Federation201917122019215110123Copyright © Гвоздяков Д.B., Зенков А.В., Губин В.Е., Ведяшкин М.В., 20192019Гвоздяков Д.B., Зенков А.В., Губин В.Е., Ведяшкин М.В.Gvozdyakov D.V., Zenkov A.V., Gubin V.E., Vedyashkin M.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.energyret.ru/jour/article/view/1110

Представлены результаты экспериментальных исследований процесса пневмомеханического распыла суспензионного топлива с пластификатором в аэродинамическом имитаторе топки энергетического котла. Выполнен анализ современного состояния в области исследования процессов распыла суспензионных топлив. Проанализировано влияние давления суспензионного топлива и воздуха на структуру формирующегося факела. Определены значения характерных размеров трех зон факела: сердцевина, средняя и внешняя зоны. Экспериментально подтверждено влияние давления распыляемого суспензионного топлива и воздуха на период формирования стабильной структуры факела и геометрические характеристики зон. Выделены диапазоны скоростей и размеров капель в потоке при различных давлениях. Получены количественные значения капель суспензионного топлива, обладающих различными скоростями, в процессе его пневмомеханического распыла. Установлено, что наибольшее число частиц в области исследования обладают скоростями до 8 м/с; значительное количество капель (до 20%) имеют скорости от 8 до 32 м/с; для 1% капель характерны скорости 32 м/с и более. При обработке результатов не учитывались образующиеся частицы-аэрозоли размером 1 мкм и менее. Определены значения критерия We для соответствующих размеров и скоростей капель распыляемого суспензионного топлива. Установлено, что значительная часть капель претерпевает катастрофическое дробление, характерное при значениях чисел We от 7800 и более. Полученные результаты могут быть использованы при математическом и физическом моделировании процесса распыла суспензионных топлив в топках энергетических котлов с целью прогностических оценок аэродинамических характеристик проектируемых и действующих агрегатов.

Results of experimental studies of pneumomechanical atomization process of slurry fuel with a plasticizer in an aerodynamic simulator of power boiler furnace are presented. Analysis of the current state in the field of research of slurry fuel atomization processes has been conducted. Influence of pressure of slurry fuel and air on the structure of the emerging spray cone have been analyzed. The values of characteristic dimensions of three zones of spray cone have been determined: core, middle and outer zones. Effect of pressure of the sprayed slurry fuel and air on the period of stable spray cone formation and geometric characteristics of the zones has been experimentally confirmed. Ranges of velocities and sizes of droplets in the flow at various pressures have been distinguished. The quantitative values of slurry fuel droplets with different velocities in the process of its pneumatic spraying have been obtained. It has been established that the largest number of particles in the study area have velocities up to 8 m/s; a significant number of droplets (up to 20%) have velocities from 8 to 32 m/s; velocities of 32 m/s and more are typical for 1% of droplets. During the results processing, aerosol particles with a size of 1 micron or less have not been taken into account. The values of We criterion for the respective sizes and velocities of the sprayed fuel droplets have been determined. It has been established that significant part of the droplets undergoes catastrophic crushing, which is characteristic for the values of We numbers from 7800 and higher. The obtained results can be used for mathematical and physical modeling of the process of slurry fuels atomization in the furnaces of power boilers in order to predict the aerodynamic characteristics of the designed and existing units.

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The authors declare that there are no conflicts of interest present.