Performance evaluation of small scale energy efficient mixed flow dryer for drying of high moisture paddy

Mondal, Md. Hasan Tarek; Shiplu, Kazi Sayed Pasha; Sen, Krishna Pada; Roy, Joysree; Sarker, Md. Sazzat Hossain

doi:10.1080/07373937.2018.1518914

Cited by 35 publications

(22 citation statements)

References 40 publications

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“…The significant reduction in the SEC was accredited to the pronounced reduction in the drying time by the combined methods. In contrast, the infrared [49] and microwave dryer [50] had a higher SEC compared to the convective drying for the paddy [38,51].…”

Section: Tablementioning

confidence: 81%

“…There are many types of grain drying technology, and the choice of drying technology in the grain processing industries depends on moisture removal, energy consumption, timesaving and nutrient retention. Incomplete and over-drying of grain are detrimental to grain nutrient retention [44,51]. The critical moisture content level of dried grain is presented in Table 2.…”

Section: Grain Drying Technologymentioning

confidence: 99%

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Recent Advances in the Drying Process of Grains

et al. 2023

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Grain drying is a vital operation in preparing finished grain products such as flour, drinks, confectioneries and infant food. The grain drying kinetics is governed by the heat and mass transfer process between the grain and the environment. Incomplete, improper and over-drying are crucial to the grain quality and negatively influence the acceptance of the grain by the consumers. Dried grain moisture content is a critical factor for developing grain drying systems and selecting optimal performance by researchers and the grain processing industry. Many grain drying technologies such as fluidised bed dryers, fixed bed dryers, infrared dryers, microwave dryers, vacuum dryers and freeze dryers have been used in recent years. To improve the drying process of grain, researchers have combined some drying technologies such as microwave + hot air, infrared + hot air and microwave + a fluidised bed dryer. Also, they introduce some treatments such as ultrasound dielectric and dehumidification. These methods enhance the dryer performance, such as higher moisture removal, reduced processing time, higher energy efficiency and nutrient retention. Therefore, this review focused on the drying conditions, time, energy consumption, nutrient retention and cost associated with the reduction of moisture content in grain to a suitable safe level for further processing and storage.

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Section: Tablementioning

confidence: 81%

Section: Grain Drying Technologymentioning

confidence: 99%

Recent Advances in the Drying Process of Grains

et al. 2023

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“…Paddy drying process consumes a large amount of heat energy to evaporate water in the paddy grains [ 31 ]. Several researchers have conducted performance analyses in terms of energy consumption (specific energy) for different types of dryers for paddy drying; these include among others, fixed bed dryers [ 32 ], fixed deep bed dryers [ 33 ], inclined bed dryers [ 34 ], fluidized bed dryers [ 17 , 18 , 35 – 43 ], spouted bed dryers [ 40 , 44 ], crossflow dryers [ 45 , 46 ], mixed-flow dryers [ 47 ], recirculating grain dryers [ 48 ], rotary dryers [ 32 , 49 ], impinging stream dryers [ 50 ], and combined impinging stream and pneumatic dryers [ 51 ]. The energy consumption of various dryers used for paddy drying is summarized in Table 1 .…”

Section: Introductionmentioning

confidence: 99%

Experimental Performance Analysis of a Pilot-Scale Biomass-Assisted Recirculating Mixed-Flow Dryer for Drying Paddy

Yahya

Fahmi

Hasibuan

2022

International Journal of Food Science

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A large amount of heat energy is required for paddy drying processes to evaporate water from paddy grains. Currently, fossil fuels are being used as an energy source to heat air during the drying process. However, fossil fuels cause air pollution, climate change, and disruption of ecological balance. In this study, to reduce the dependence on fossil fuels for paddy drying, a pilot-scale biomass-assisted recirculating mixed-flow drying system (PSBA-RMFD) for drying paddy was designed, installed, and tested. In this PSBA-RMFD, the heat energy required for heating the drying air was provided only by biomass. The PSBA-RMFD comprises a biomass furnace, drying column, vibratory feeder, bucket elevator, and blower. This study is aimed at evaluating the performance of the PSBA-RMFD with a drying capacity of 400 kg/h. The performance metrics of the PSBA-RMFD were specific energy consumption (SEC), specific thermal energy consumption (STEC), specific moisture evaporation rate (SMER), thermal efficiency of the PSBA-RMFD, exergy efficiency of the drying section, and improvement potential of the dryer. From the experiments conducted in this study, the values of the aforementioned performance parameters were as follows: 0.806-8.656 kW h/kg of water evaporated; 0.385-4.136 kW h/kg of water evaporated; 0.122-1.308 kg of water evaporated/kW h; 7.82-83.99%; 15.28-25.64%; and 858.90-1355.62 W, respectively. The paddy moisture content was reduced from 20.90% wet basis (initial weight of 400 kg) to 13.30% wet basis (final weight of 364 kg) in 270 min, with an average temperature of 78.15°C and average relative humidity of 8.55%. The percentage of biomass energy used in the drying system was approximately 47.77% of the overall energy. In addition, the payback period of the PSBA-RMFD was 1.9 years.

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“…Thus, the active control method will be fully developed in the future. Impinging Stream (IS), widely applied in the chemical industry, 17 effectively enhances momentum transfer and turbulent intensity. Impinging Stream refers to multiple two-phase or multiphase flows mutual impinging under certain angle conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the flow field regulation characteristics of the right-angled channel by impinging disturbance method

Wang

Yin

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The right-angled constrained channel with square-section is a typical channel configuration in many engineering fields. However, due to the high curvature of the right-angled constrained channel, the flow field parameters are not uniformly distributed, which has an adverse effect on resource utilization or reaction efficiency of the industrial process. To address the above matters, the modeling and solving method for impinging disturbance-based flow field regulation are proposed to regulate the flow field distribution. According to the design criteria of the disturbance channel, a numerical model of impinging disturbance is set up based on the mixture multiphase model and realizable [Formula: see text] turbulence model. And the pressure–velocity coupling solution strategies are conducted to quickly solve the impinging disturbance mechanism. The distribution law of the flow field parameters at different disturbance velocities is obtained to reveal the turbulence variation mechanism caused by impinging disturbance. These research results show that the disturbance vortex produced by the collision between the disturbance flow and the mainstream can affect the parameter distribution characteristics of the flow field in the constrained channel together with the backflow vortex, dean vortex, and the secondary vortex. The disturbance flow can effectively interfere with or control the vortex structure and indirectly regulate the flow field parameters to improve uniformity and energy utilization by actively regulating the disturbance velocity.

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Performance evaluation of small scale energy efficient mixed flow dryer for drying of high moisture paddy

Cited by 35 publications

References 40 publications

Recent Advances in the Drying Process of Grains

Recent Advances in the Drying Process of Grains

Experimental Performance Analysis of a Pilot-Scale Biomass-Assisted Recirculating Mixed-Flow Dryer for Drying Paddy

Investigation on the flow field regulation characteristics of the right-angled channel by impinging disturbance method

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