Thermokinetics of Brown Coal during a Fluidized Drying Process

Plutecki, Z.; Sattler, Paweł; Ryszczyk, Krystian; Duczkowska, Anna; Anweiler, Stanisław

doi:10.3390/en13030684

Cited by 3 publications

(2 citation statements)

References 37 publications

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“…Penggunaan batu bara di Indonesia cenderung menggunakan batu bara berjenis bitminious dan subitminious yang kualitasnya lebih tinggi dibandingkan batu bara lignit. Batu bara lignit dikenal kurang ekonomis dikarenakan sifatnya yang sangat berbeda tergantung pada asalnya dan juga hanya mengandung 40% komposisi dari total batu bara dan bahan baku yang dipasarkan dengan tingkat keamanan yang tinggi [5,6]. Berdasarkan tingkat kalori, distribusi batu bara di Indonesia yaitu batu bara kalori rendah (<5100 kal/gram) 326,40 miliar ton, kalori sedang (5100-6100 kal//gram) 82,26 miliar ton, kalori tinggi (6100-7100 kal/gram) 8,27 miliar ton dan kalori yang sangat tinggi (>7100 kal/gram) 2,11 miliar ton [7].…”

Section: Pendahuluanunclassified

Analisa Kebutuhan Batu Bara pada Unit Dryer dalam Pengeringan Pupuk NPK di PT AGS Medan

Simatupang¹,

Yunianto²,

Sihaloho³

2021

CHEESA

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PT. AGS Medan merupakan pabrik yang bergerak dalam produksi pupuk NPK yang salah satu produknyaadalah formula 12.12.17 dengan komposisi 12% unsur nitrogen, 12% unsur fosfor dan17% unsur kalium. Salah satu tahapan dalam proses pembuatan pupuk NPK yaitu proses pengeringan. Jenis dryer yang digunakan adalah rotary dryer dengan putaran 5 rpm dan kemiringan 20o. Pengering yang digunakan adalah udara panas yang berasal dari pembakaran batu bara jenis bitminious di dalam furnace.Untuk menentukan jumlah batu bara yang dibutuhkan dalam proses pengeringan pupuk NPK sebagai bahan bakar furnace maka diperlukan perhitungan jumlah panas. Pengambilan sampel, analisis kadar air dan suhu serta menghitung panas dengan prinsip neraca massa dilakukan dalam penelitian ini. Berdasarkan perhitungan yang telah dilakukan untuk mengeringkan pupuk NPK dengan kapasitas pupuk NPK 7000 kg/jam dibutuhkan energi sebesar 6136268,402Kkal/jam. Jumlah bahan bakar yang dibutuhkan untuk mengeringkan pupuk NPK adalah sebesar 789,219kg/jam.

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Section: Pendahuluanunclassified

Analisa Kebutuhan Batu Bara pada Unit Dryer dalam Pengeringan Pupuk NPK di PT AGS Medan

Simatupang¹,

Yunianto²,

Sihaloho³

2021

CHEESA

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“…However, the high moisture content of coking coal (9-12%) leads to high energy consumption and low efficiency of the coking plant. Therefore, setting a pre-drying process before coking could efficiently lower the energy consumption, improve the quality of the coke, increase the blending ratio of non-or weak-caking coal, reduce the production of greenhouse gases and harmful gases, as well as reduce the impact on the water environment [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Construction of a New Type of Coal Moisture Control Device Based on the Characteristic of Indirect Drying Process of Coking Coal

et al. 2020

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This paper presents an in-depth study on the indirect drying characteristics and interface renewal. By comparing the drying rate curve, it is found that shortening the surface drying stage, which contains a repeated evaporation-diffusion-condensation process of moisture, is the key to improve the total drying efficiency. By stirring the coal and realizing the interface renewal between the bottom layer and the surface layer, the drying efficiency reached seven times than that of static indirect drying. Based on indirect heat transfer with high heat and mass transfer rate, a new type of indirect heat transfer moving bed coal moisture control device is designed. At the same time, Fluent fluid mechanics software is used for mathematical modeling and simulation experiments. It is proved that the designed moving bed coal moisture control device has a good application prospect in coal pre-drying technology.

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Application of Pseudohomogeneous and Heterogeneous Models in Assessing the Behavior of a Fluidized-Bed Catalytic Reactor

Bizon

2021

Energies

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Comparative analysis of the steady-state and transient properties of a bubbling fluidized-bed catalytic reactor obtained according to different mathematical models of the emulsion zone was performed to verify the commonly used assumption regarding the pseudohomogeneous nature of this zone. Four different mathematical models of the fluidized-bed reactor dynamics were formulated, based on different thermal and diffusional conditions at the gas-solid interface and within the catalyst pellet, namely the model based on the assumption of pseudohomogeneous character for the emulsion zone, and a group of two-scale models accounting for the heterogeneous character of this zone. It was demonstrated that, while the pseudohomogeneous model of the emulsion zone predicts almost identical behavior of the reactor at steady-state as the proposed heterogeneous models, it may fail in the prediction of the reactor start-up behavior, especially when dealing with highly exothermic processes run at relatively high fluidization velocity.

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Thermokinetics of Brown Coal during a Fluidized Drying Process

Cited by 3 publications

References 37 publications

Analisa Kebutuhan Batu Bara pada Unit Dryer dalam Pengeringan Pupuk NPK di PT AGS Medan

Analisa Kebutuhan Batu Bara pada Unit Dryer dalam Pengeringan Pupuk NPK di PT AGS Medan

Construction of a New Type of Coal Moisture Control Device Based on the Characteristic of Indirect Drying Process of Coking Coal

Application of Pseudohomogeneous and Heterogeneous Models in Assessing the Behavior of a Fluidized-Bed Catalytic Reactor

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