Preporuke za proračun i projektovanje zakola ventilatorskog mlina
Suggestions for calculation and construction of the fan mill barriers hoop
Апстракт
Čestice uglja se prilikom prolaska kroz udarno kolo ventilatorskog mlina melju udarom i trenjem. Putanja čestice ugljenog praha posle napuštanja udarnog kola se povija prema izlazu iz spirale usled čega se sudar sa pancirnim pločama kućišta odvija pod malim uglom. Mlevenje uglja u ventilatorskom mlinu je relativno grubo zbog čega se iza mlina postavlja separator. Efikasnost naknadnog mlevenja iza udarnog kola, kod ovih mlinova, može se povećati postavljanjem nepokretnih prepreka u vidu zakola, u spiralu kućišta mlina, oko udarnog kola. Povećanjem koeficijenta prozračnosti zakola, koji zavisi od broja prepreka, dimenzije prepreke i recipročne vrednosti srednjeg prečnika zakola, može se povećati efikasnost mlevenja. Značajnog uticaja na povećanje finoće mlevenja takođe ima oblik prepreke i ugao njenog postavljanja prema udarnom kolu. Pri konstruisanju zakola kod ovog mlina potrebno je izvršiti odgovarajuće profilisanje same spirale, kako bi se ostvario najmanji nad pritiska pri, strujanj...u sušećeg fluida i samlevenih čestica uglja. Zbog poboljšanog kvaliteta ugljenog praha kod ovih mlinova, može se ostvariti protočni proces mlevenja uglja bez separatora.
While passing through the fan mill beater wheel, coal particles are mutually ground both by collision and friction. Having left the beater wheel, under the influence of transport fluid flow in the mill chamber spiral, the path of coal particles turns towards the spiral's exit, providing that the collision with the chamber armoured plates occur under the low angle. The process of the coal grinding inside the fan mill is relatively rough therefore the coal powder separator should be installed behind the mill. The efficiency of after-grinding process in the fan mills, behind the beating wheel, may be increased after the installed fixed, hoop-shaped barriers into the chamber spiral, around the beater wheel. The increase in the hoop 's transparency coefficient, which depends on the number and size of barriers, as well as reciprocal value of the mean hoop's diameter, may influence the increase of the grinding efficiency. The barrier's shape and it 's installment angle towards the beating whe...el also make a significant influence on the grinding quality. While constructing the body it is necessary to profile the spiral correctly in order to achieve the smallest pressure loss during the flow of pulverized coal/conveying gas mixture. The increased rate of the grinding quality enables the coal grinding process performed with no coal powder separators.
Кључне речи:
spiral housing / obstacles / Fan mill / beater wheel / barriers hoopИзвор:
FME Transactions, 2002, 30, 1, 23-28Издавач:
- Univerzitet u Beogradu - Mašinski fakultet, Beograd
Колекције
Институција/група
Inovacioni centarTY - JOUR AU - Živanović, Titoslav PY - 2002 UR - https://machinery.mas.bg.ac.rs/handle/123456789/297 AB - Čestice uglja se prilikom prolaska kroz udarno kolo ventilatorskog mlina melju udarom i trenjem. Putanja čestice ugljenog praha posle napuštanja udarnog kola se povija prema izlazu iz spirale usled čega se sudar sa pancirnim pločama kućišta odvija pod malim uglom. Mlevenje uglja u ventilatorskom mlinu je relativno grubo zbog čega se iza mlina postavlja separator. Efikasnost naknadnog mlevenja iza udarnog kola, kod ovih mlinova, može se povećati postavljanjem nepokretnih prepreka u vidu zakola, u spiralu kućišta mlina, oko udarnog kola. Povećanjem koeficijenta prozračnosti zakola, koji zavisi od broja prepreka, dimenzije prepreke i recipročne vrednosti srednjeg prečnika zakola, može se povećati efikasnost mlevenja. Značajnog uticaja na povećanje finoće mlevenja takođe ima oblik prepreke i ugao njenog postavljanja prema udarnom kolu. Pri konstruisanju zakola kod ovog mlina potrebno je izvršiti odgovarajuće profilisanje same spirale, kako bi se ostvario najmanji nad pritiska pri, strujanju sušećeg fluida i samlevenih čestica uglja. Zbog poboljšanog kvaliteta ugljenog praha kod ovih mlinova, može se ostvariti protočni proces mlevenja uglja bez separatora. AB - While passing through the fan mill beater wheel, coal particles are mutually ground both by collision and friction. Having left the beater wheel, under the influence of transport fluid flow in the mill chamber spiral, the path of coal particles turns towards the spiral's exit, providing that the collision with the chamber armoured plates occur under the low angle. The process of the coal grinding inside the fan mill is relatively rough therefore the coal powder separator should be installed behind the mill. The efficiency of after-grinding process in the fan mills, behind the beating wheel, may be increased after the installed fixed, hoop-shaped barriers into the chamber spiral, around the beater wheel. The increase in the hoop 's transparency coefficient, which depends on the number and size of barriers, as well as reciprocal value of the mean hoop's diameter, may influence the increase of the grinding efficiency. The barrier's shape and it 's installment angle towards the beating wheel also make a significant influence on the grinding quality. While constructing the body it is necessary to profile the spiral correctly in order to achieve the smallest pressure loss during the flow of pulverized coal/conveying gas mixture. The increased rate of the grinding quality enables the coal grinding process performed with no coal powder separators. PB - Univerzitet u Beogradu - Mašinski fakultet, Beograd T2 - FME Transactions T1 - Preporuke za proračun i projektovanje zakola ventilatorskog mlina T1 - Suggestions for calculation and construction of the fan mill barriers hoop EP - 28 IS - 1 SP - 23 VL - 30 UR - https://hdl.handle.net/21.15107/rcub_machinery_297 ER -
@article{ author = "Živanović, Titoslav", year = "2002", abstract = "Čestice uglja se prilikom prolaska kroz udarno kolo ventilatorskog mlina melju udarom i trenjem. Putanja čestice ugljenog praha posle napuštanja udarnog kola se povija prema izlazu iz spirale usled čega se sudar sa pancirnim pločama kućišta odvija pod malim uglom. Mlevenje uglja u ventilatorskom mlinu je relativno grubo zbog čega se iza mlina postavlja separator. Efikasnost naknadnog mlevenja iza udarnog kola, kod ovih mlinova, može se povećati postavljanjem nepokretnih prepreka u vidu zakola, u spiralu kućišta mlina, oko udarnog kola. Povećanjem koeficijenta prozračnosti zakola, koji zavisi od broja prepreka, dimenzije prepreke i recipročne vrednosti srednjeg prečnika zakola, može se povećati efikasnost mlevenja. Značajnog uticaja na povećanje finoće mlevenja takođe ima oblik prepreke i ugao njenog postavljanja prema udarnom kolu. Pri konstruisanju zakola kod ovog mlina potrebno je izvršiti odgovarajuće profilisanje same spirale, kako bi se ostvario najmanji nad pritiska pri, strujanju sušećeg fluida i samlevenih čestica uglja. Zbog poboljšanog kvaliteta ugljenog praha kod ovih mlinova, može se ostvariti protočni proces mlevenja uglja bez separatora., While passing through the fan mill beater wheel, coal particles are mutually ground both by collision and friction. Having left the beater wheel, under the influence of transport fluid flow in the mill chamber spiral, the path of coal particles turns towards the spiral's exit, providing that the collision with the chamber armoured plates occur under the low angle. The process of the coal grinding inside the fan mill is relatively rough therefore the coal powder separator should be installed behind the mill. The efficiency of after-grinding process in the fan mills, behind the beating wheel, may be increased after the installed fixed, hoop-shaped barriers into the chamber spiral, around the beater wheel. The increase in the hoop 's transparency coefficient, which depends on the number and size of barriers, as well as reciprocal value of the mean hoop's diameter, may influence the increase of the grinding efficiency. The barrier's shape and it 's installment angle towards the beating wheel also make a significant influence on the grinding quality. While constructing the body it is necessary to profile the spiral correctly in order to achieve the smallest pressure loss during the flow of pulverized coal/conveying gas mixture. The increased rate of the grinding quality enables the coal grinding process performed with no coal powder separators.", publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd", journal = "FME Transactions", title = "Preporuke za proračun i projektovanje zakola ventilatorskog mlina, Suggestions for calculation and construction of the fan mill barriers hoop", pages = "28-23", number = "1", volume = "30", url = "https://hdl.handle.net/21.15107/rcub_machinery_297" }
Živanović, T.. (2002). Preporuke za proračun i projektovanje zakola ventilatorskog mlina. in FME Transactions Univerzitet u Beogradu - Mašinski fakultet, Beograd., 30(1), 23-28. https://hdl.handle.net/21.15107/rcub_machinery_297
Živanović T. Preporuke za proračun i projektovanje zakola ventilatorskog mlina. in FME Transactions. 2002;30(1):23-28. https://hdl.handle.net/21.15107/rcub_machinery_297 .
Živanović, Titoslav, "Preporuke za proračun i projektovanje zakola ventilatorskog mlina" in FME Transactions, 30, no. 1 (2002):23-28, https://hdl.handle.net/21.15107/rcub_machinery_297 .