Granulacja bębnowa surowców drobnoziarnistych o różnych skladach ziarnowych

• Autorzy: Gluba T.

Warianty tytułu

EN

Drum granulation of fine-grained materials with different grain compositions

• Języki publikacji: PL

Abstrakty

PL

W procesie mokrej granulacji realizowanej w obrotowych bębnach zasadniczy wpływ na przebieg procesu i właściwości wytworzonego produktu mają zjawiska i przemiany zachodzące na granicy faz mediów uczestniczących w ruchu przesypowym nawilżonego złoża materiału. Oddziaływania między poszczególnymi ziarnami materiału lub pewnymi ich zbiorami są zależne od właściwości poszczególnych mediów, a w szczególności od składu ziarnowego granulowanego surowca. W niniejszej pracy, w oparciu o wyniki badań własnych oraz przedmiotową literaturę, przedstawiono ocenę wpływu warunków prowadzenia procesu granulacji na właściwości cząstek produktu wytworzonego z materiałów drobnoziarnistych o różnych składach ziarnowych. W pierwszej części pracy scharakteryzowano podstawowe właściwości materiałów ziarnistych, a także sposoby ich określania. W kolejnym rozdziale przedstawiono stan wiedzy w zakresie mechanizmów powstawania i wzrostu aglomeratów. Omówiono kinetykę formowania zarodków, zagadnienia dotyczące wzajemnych relacji ciecz wiążąca-materiał drobnoziarnisty, a także przedstawiono modele wzrostu dotyczące zarówno etapu nukleacji, jak i dalszego wzrostu granul na drodze koalescencji, ścierania i nawarstwiania. Rozdział 4 zawiera opis modelowych materiałów drobnoziarnistych stosowanych podczas badań doświadczalnych, sposób ich przygotowania, a także podstawowe właściwości fizyczne. Przedstawiono tu również opis użytej aparatury badawczej oraz dobór warunków nawilżania złoża w procesie granulacji. W rozdziale 5 przedstawiono wyniki badań kinetyki wzrostu aglomeratów w procesie granulacji bębnowej dla różnych materiałów drobnoziarnistych i różnych warunków procesowych. Omówiono wpływ warunków nawilżania złoża (wilgotności wsadu, intensywności nawilżania, wielkości kropel cieczy wiążącej) na przebieg procesu i skład granulometryczny przetwarzanego wsadu. Zaproponowano mapę zakresów granulacji wyróżniającą trzy różne obszary przebiegu procesu w zależności od wilgotności wsadu i rozmiarów kropel cieczy wiążącej. Rozdział 6 jest poświęcony ocenie porowatości aglomeratów wytworzonych w procesie mokrej granulacji materiałów o różnym uziarnieniu, przy zmiennych warunkach nawilżania wsadu. Przedstawiono zależności opisujące szybkość zagęszczania ziaren w granulach w trakcie procesu w funkcji wilgotności wsadu i średniego rozmiaru ziaren surowca. Określono nakłady energii koniecznej na jednostkowy przyrost zagęszczenia ziaren w granulach wytworzonych z materiałów o różnym uziarnieniu, w zależności od wilgotności wsadu. W rozdziale 7 przedstawiono wyniki badań gęstości nasypowej granulatu wytworzonego z różnych surowców, przy zmiennych warunkach nawilżania. Przedstawiono analizę zmian gęstości nasypowej granulowanego złoża w trakcie procesu uwzględniającą zmiany składu ziarnowego wsadu oraz zagęszczanie ziaren w granulach. Rozdział 8 prezentuje badania wytrzymałości mechanicznej granul. Przedstawiono metody badań wytrzymałościowych, a także formy niszczenia granul o różnych właściwościach fizycznych. W części doświadczalnej przedstawiono wyniki badań wytrzymałości na ściskanie pojedynczych granul w stanie wysuszonym, wytworzonych w procesie mokrej granulacji bębnowej, przy różnych parametrach procesowych. Dokonano analizy wpływu składu ziarnowego granulowanego surowca oraz warunków jego nawilżania na wartości sił i naprężeń ściskających, powodujących niszczenie granul o określonych wymiarach. Przedstawiono również wyniki oceny wytrzymałości granulatu przy wykorzystaniu testu na ścieranie. W rozdziale 9 przedstawiono zagadnienia związane z dynamiką wsadu przesypującego się w obrotowym bębnie. Na podstawie chwilowych wartości momentu obrotowego rejestrowanego na wale granulatora określano zapotrzebowanie mocy w poszczególnych fazach procesu granulacji, a następnie jednostkowe zużycie energii na przetworzenie nawilżonego złoża w granulat. Określono wpływ średniego wymiaru ziaren surowca i wilgotności wsadu na nakłady energetyczne odniesione do jednostkowego przyrostu średniego wymiaru granul.

EN

In the wet granulation process performed in the rotary drum, phenomena and the changes occurring at the interface of media involved in the tumbling of the wetted bed material have major impact on the process course and the properties of formed product. The interactions between individual grains of the material or some their sets depend on the characteristics of the media, in particular, on the grain composition of granulated material. This paper provides the assessment of the impact of granulation process conditions on the properties of grain particles of product obtained from finegrained materials with different grain compositions, prepared on the basis of the results of own research and data from subject literature. In the first part of this work the basic properties of granulated materials and the methods for their determination are characterized. The next chapter presents the state of knowledge concerning the mechanisms of formation and agglomerates growth. The kinetics of nuclei formation and issues concerning the relationship between binding liquid and fine material are discussed here. Moreover, growth models applying to the nucleation stage and to the further growth of granules via their coalescence, abrasion and layering are presented in this part. Chapter 4 contains the description of model fine-grained materials used in experimental studies, methods of their preparation and also their basic physical properties. It also describes the equipment used in the study and presents the choice of bed wetting conditions during the granulation process. Chapter 5 presents the results of the study of agglomerates growth kinetics in the process of drum granulation of various fine-grained materials in different process conditions. The influence of bed wetting conditions (batch moisture content, wetting intensity, binding liquid droplet size) on both the process course and the granulometric composition of the processed batch is described. The map of granulation regions which distinguishes three different areas of the process course depending on the batch moisture and binding liquid droplets size has been suggested. Chapter 6 is devoted to the assessment of the porosity of the agglomerates formed in the process of wet granulation of materials with different grain sizes and during which different conditions of batch wetting are used. It presents the relations describing the rate of grains concentrations during granulation as a function of both batch moisture content and the mean material grains size. The energy input required for the unit increase in the grains density of granules formed from the material with different grain sizes, depending on batch moisture is specified here. Chapter 7 presents the results of the study of bulk density of granulate obtained from different raw materials with the use of different wetting conditions. The analysis of changes in bulk density of granulated deposits during the process, which takes into consideration the changes in the grain composition of the batch as well as grains concentration in granules, is presented here. Chapter 8 presents the study of granules mechanical strength. The methods of strength tests, as well as the means of destruction of granules with different physical properties are described. The experimental part presents the results of compressive strength test for individual granules, in a dried state, which were formed in the process of wet drum granulation with different process parameters. The analysis of the impact of grain composition of granulated material and the conditions of its wetting on the forces and compressive stress which lead to the destruction of the granules with definite dimensions were conducted. The paper also presents the results of granule strength analysis performed with the use of the abrasion test. Chapter 9 presents the issues related to the dynamics of batch tumbling in the rotary drum. On the basis of the instantaneous torque values registered on the granulator shaft, the power demand in the particular phases of the granulation process, and the unit energy consumption required for the processing of wetted batch into granules have been determined. The influence of mean grain size of raw material and batch moisture content on the energy input relating to a unit increase in mean size of granules have been assessed.

Słowa kluczowe

PL

granulacja bębnowa; materiały ziarniste; aglomerat; granulat

EN

drum granulation; granular materials; agglomertae; granulate

• Wydawca: Wydawnictwo Politechniki Łódzkiej
• Czasopismo: Zeszyty Naukowe. Rozprawy Naukowe / Politechnika Łódzka
• Rocznik: 2012
• Tom: Z. 423
• Strony: 1--206
• Opis fizyczny: Bibliogr. 240 poz.

Twórcy

autor

Gluba T.

• Wydział Inżynierii Procesowej i Ochrony Środowiska Politechniki Łódzkiej

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