Деякі способи зміни структури крапельного потоку при диспергуванні води плоскоструменними форсунками
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Дата
2020
DOI
doi.org/10.20998/2078-774X.2020.01.04
Науковий ступінь
Рівень дисертації
Шифр та назва спеціальності
Рада захисту
Установа захисту
Науковий керівник
Члени комітету
Видавець
Національний технічний університет "Харківський політехнічний інститут"
Анотація
Розглядається можливість управління структурою крапельного потоку при використанні плоскофакельних струменевих форсунок з формою зони зрошення поверхні у вигляді еліпса стосовно металургії. Розглянуто результати експериментальних досліджень різних варіантів зміни структури потоку: водо-повітряного диспергування води при внутрішньому сумішоутворюванні в форсунці, взаємному перетині крапельних потоків двох форсунок і трансформації крапельного потоку, який проходить крізь металеву сітку. Наведені дослідження сприяють оптимізації теплової підготовки валків.
Consideration is given to the possibility of the control of the structure of the trickle flow by using flat-plate jet nozzles for the elliptic shape of the surface of the spray zone. This research paper gives consideration to the data of experimental investigations of the water-air dispersed water during the internal mixture formation in the flat-plate nozzle as applied to the cooling of the ingot between the rollers in continuous steel casting machines. In this case, the water flow rate per nozzle and the water concentration can be reduced ten times. As a result, the ingot cooling intensity is reduced and the probability of the crack nucleation on the ingot surface is decreased. This research paper gives also the data of the experimental research carried out for a more efficient use of flat-plate nozzles when cooling the casting roller before its polishing and when heating it before charging the mill stand. It was shown that the intercrossing of trickle flows produced by two flat-plate jet nozzles arranged at an angle relative to each other results in the four-time increase in the spray zone surface area and the surface spray density is reduced two times. The analogous problem was solved using the kinetic energy of the disintegrating water film and the drops after these leave the flat-plate nozzle for the additional splitting when passing through the metal gauze. It turned out that the spray zone was increased threefold and the surface spray density was decreased two times. The trickle flow structure control options in question with the use of flatplate nozzles contribute to the improved quality of the ingots, decreased water consumption, reduced number of the nozzles and their simplified arrangement on the collectors.
Consideration is given to the possibility of the control of the structure of the trickle flow by using flat-plate jet nozzles for the elliptic shape of the surface of the spray zone. This research paper gives consideration to the data of experimental investigations of the water-air dispersed water during the internal mixture formation in the flat-plate nozzle as applied to the cooling of the ingot between the rollers in continuous steel casting machines. In this case, the water flow rate per nozzle and the water concentration can be reduced ten times. As a result, the ingot cooling intensity is reduced and the probability of the crack nucleation on the ingot surface is decreased. This research paper gives also the data of the experimental research carried out for a more efficient use of flat-plate nozzles when cooling the casting roller before its polishing and when heating it before charging the mill stand. It was shown that the intercrossing of trickle flows produced by two flat-plate jet nozzles arranged at an angle relative to each other results in the four-time increase in the spray zone surface area and the surface spray density is reduced two times. The analogous problem was solved using the kinetic energy of the disintegrating water film and the drops after these leave the flat-plate nozzle for the additional splitting when passing through the metal gauze. It turned out that the spray zone was increased threefold and the surface spray density was decreased two times. The trickle flow structure control options in question with the use of flatplate nozzles contribute to the improved quality of the ingots, decreased water consumption, reduced number of the nozzles and their simplified arrangement on the collectors.
Опис
Ключові слова
металургія, злитки, прокат, валки, metallurgy, ingots, rolled metal, rollers
Бібліографічний опис
Пересьолков О. Р. Деякі способи зміни структури крапельного потоку при диспергуванні води плоскоструменними форсунками / О. Р. Пересьолков, О. В. Круглякова // Вісник Національного технічного університету "ХПІ". Сер. : Енергетичні та теплотехнічні процеси й устаткування = Bulletin of the National Technical University "KhPI". Ser. : Power and Heat Engineering Processes and Equipment : зб. наук. пр. – Харків : НТУ "ХПІ", 2020. – № 1. – С. 24-29.