Calculating Capacity Trends in Rotary Dryers

Pacheco, Calas; Stella, S.

doi:10.1590/s0104-66321998000300002

Cited by 5 publications

(4 citation statements)

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“…The model consist of differential mass balance of moisture in solid particle in the rotary dryer that can be represented in Equation 7. Parameter ' β in Equation 18is called partition factor defined in Equation (19) to account for surface resistance of mass transfer while gas side mass transfer coefficient in Equation 18was estimated using empirical correlation [7].…”

Section: Methodsmentioning

confidence: 99%

“…These researchers estimate theoretically the rate of drying with the diffusion model. Meanwhile, theoretical studies for the performance of the drying process in the rotary dryer (for some specific materials) has been developed by several researchers, including the Yliniemi [25] uses the assumption of uniform particle size and makes the flow of solid particles in a rotary dryer a mixed flow (lump-parameter model); and Wang et al [24], Kiranoudis et al [13], Pacheco & Stella [19], Menshutina et al [17] which also used the uniform particle size assumption but the solid and gas flow inside the rotary dryer is assumed plugflow (distributed parameter model).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Particle Size Distribution on Ammonium Sulphate Dried in a Rotary Dryer

Susianto¹,

Altway²,

Kuswandi³

et al. 2010

JTS

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   The aim of this work is to study theoretically, by mathematical model development, the effect of particle size distribution on the performance of rotary dryer to dry ammonium sulphate fertilizer assuming plug flow with axial dispersion pattern (PFDA model) for solid particle flow. The mathematical model development was carried out by combining the drying processes model with particle size distribution model. Particle size distribution models used are Rosin-Rommler model and Gamma distribution model. For simplicity, the model of drying processes of solid particles in the rotary dryer was developed by assuming of uniform air conditions (temperature and humidity) along the rotary dryer as in the entry conditions. The resulting differential equations were solved analytically under Matlab 6.1 facility.Since this model, solid hold up, and axial dispersion number were obtained from empirical correlations in the literatures. The drying rate of ammonium sulphate fertilizer in rotary dryer was estimated using isothermal diffusion model with effective diffusivity of moisture in the particle obtained from previous study [2]. Using Gamma function distribution, this research showed that for the value of the coefficient of variance (CV) less than 0.5, particle size distribution does not have significant effect on dryer performance. For the value of CV greater than 0.5, the dryer performance increase (or outlet solid moisture content decrease) with increasing the value of CV. The application of Rosin-Rammler model gives lower prediction of outlet solid moisture content compared to the application of Gamma function model.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size Distribution on Ammonium Sulphate Dried in a Rotary Dryer

Susianto¹,

Altway²,

Kuswandi³

et al. 2010

JTS

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show abstract

“…Keseluruhan kesetimbangan massa diberikan pada persamaan (9) (Adeodu et al, 2019). Keseluruhan kesetimbangan entalpi dapat diketahui melalui persamaan beriku (PACHECO & STELLA, 1998).…”

Section: Metodeunclassified

Pengeringan Bagasse Menggunakan Metode Rotary Dryer Kapasitas 69,628 Kg Per Jam

Jaelani

Kuncoro

2022

macha

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Bagasse merupakan produk salah satu produk samping dari produksi gula tebu. Bagasse digunakan sebagai bahan bakar boiler untuk menghasilkan steam yang berfungsi untuk mejalankan sistem kelistrikan maupun kegiatan produktivitas pabrik gula. pada penelitian ini ditujukan untuk merancang alat rotary dryer dengan aliran udara pengering searah dengan aliran bagasse (co-current). Evaluasi dari perhitungan dilakukan untuk mengeringkan bagasse berkapsitas 69,628 kg/jam dengan kandungan air sebesar 55% menjadi 20%. Hasil pemodelan ditemukan bahwa dibutuhkan temperatur udara pengering 135 ?, kecepatan udara 1.5 m/s, dan menghasilkan energi uap panas sebesar 155.3 kJ/kg pada zona III, 140 kJ/kg pada zona II dan pada zoma I energi uap panas sebesar 170.3 kJ/kg. Air yang dapat ter evaporasi pada sistem ini 30462.15 kg.

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“…This method is particularly used for sensitive products such as antibiotics, enzymes and bacterial suspensions. In rotary drum dryers (Pacheco and Stella, 1998) water is removed by conduction of heat over a thin film of solution on a steam heated surface. This is carried out in an inclined rotating drum and the dried product sticks to the drum surface, which is recovered at the discharge point.…”

Section: Dryingmentioning

confidence: 99%

A roadmap for the synthesis of separation networks for the recovery of bio-based chemicals: Matching biological and process feasibility

Yenkie

Clark

et al. 2016

Biotechnology Advances

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Microbial conversion of renewable feedstocks to high-value chemicals is an attractive alternative to current petrochemical processes because it offers the potential to reduce net CO emissions and integrate with bioremediation objectives. Microbes have been genetically engineered to produce a growing number of high-value chemicals in sufficient titer, rate, and yield from renewable feedstocks. However, high-yield bioconversion is only one aspect of an economically viable process. Separation of biologically synthesized chemicals from process streams is a major challenge that can contribute to >70% of the total production costs. Thus, process feasibility is dependent upon the efficient selection of separation technologies. This selection is dependent on upstream processing or biological parameters, such as microbial species, product titer and yield, and localization. Our goal is to present a roadmap for selection of appropriate technologies and generation of separation schemes for efficient recovery of bio-based chemicals by utilizing information from upstream processing, separation science and commercial requirements. To achieve this, we use a separation system comprising of three stages: (I) cell and product isolation, (II) product concentration, and (III) product purification and refinement. In each stage, we review the technology alternatives available for different tasks in terms of separation principles, important operating conditions, performance parameters, advantages and disadvantages. We generate separation schemes based on product localization and its solubility in water, the two most distinguishing properties. Subsequently, we present ideas for simplification of these schemes based on additional properties, such as physical state, density, volatility, and intended use. This simplification selectively narrows down the technology options and can be used for systematic process synthesis and optimal recovery of bio-based chemicals.

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Calculating Capacity Trends in Rotary Dryers

Cited by 5 publications

References 0 publications

Effect of Particle Size Distribution on Ammonium Sulphate Dried in a Rotary Dryer

Effect of Particle Size Distribution on Ammonium Sulphate Dried in a Rotary Dryer

Pengeringan Bagasse Menggunakan Metode Rotary Dryer Kapasitas 69,628 Kg Per Jam

A roadmap for the synthesis of separation networks for the recovery of bio-based chemicals: Matching biological and process feasibility

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