Assessment of a Two-Stage Zeolite Dryer for Energy-Efficient Drying

Djaeni, Mohamad; Bartels, P.V.; Asselt, C.J. van; Sanders, J.P.M.; Straten, G. van; Boxtel, A.J.B. van

doi:10.1080/07373930903263210

Cited by 19 publications

(23 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The positive result has been shown by air dehumidification with adsorbent such as zeolite (Revilla et al, 2006;Djaeni et al, 2009;Ratti, 2001;Atuonwu et al, 2011). The zeolite has high affinity to water that can remove the moisture in air up to 0.1 ppm or close to 0% relative humidity (Djaeni et al, 2013a).…”

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Energy Efficient Dryer with Rice Husk Fuel for Agriculture Drying

Djaeni

Asiah

Suherman

et al. 2015

Int. J. Renew. Energy Dev.

Self Cite

View full text Add to dashboard Cite

ABSTRACT:Energy usage is crucial aspect on agriculture drying process. This step spends about 70% of total energy in post harvest treatment. The design of efficient dryer with renewable energy source is urgently required due to the limitation of fossil fuel energy. This work discusses the performance of air dehumidification using rice husk fuel as heat source for onion, and paddy drying. Unlike conventional dryer, the humidity of air during the drying was dehumidified by adsorbent. Hence, the driving force of drying can be kept high. As consequences, the drying time and energy usage can be reduced. Here, the research was conducted in two step: laboratory and pilot scale tests. Results showed that the lowering air humidity with rice husk fuel has improved the energy efficiency. At operational temperature 60 o C, the heat efficiency of 75% was achieved.

show abstract

Section: Introductionmentioning

confidence: 95%

“…The rice husk was selected because its combustion value to 15 MJ/kg. With latent heat of water evaporation about 2.5 MJ/kg, one kilogram of rice husk can evaporate 6 kg of free moisture (Djaeni and Asiah, 2014) In the pilot scale, the heat efficiency was estimated with the following equations (Djaeni et al, 2013b;Djaeni et al, 2009).…”

Section: Methodsmentioning

confidence: 99%

Energy Efficient Dryer with Rice Husk Fuel for Agriculture Drying

Djaeni

Asiah

Suherman

et al. 2015

Int. J. Renew. Energy Dev.

Self Cite

View full text Add to dashboard Cite

show abstract

“…[15,16] Different drying conditions or methods, including freeze, vacuum, adsorption, microwave as well as heat lump drying, have been combined during two-stage drying. [17][18][19][20][21] Meda [22] reported the two-stage drying of berries with combined microwave-vacuum, hot-air drying, and freeze-drying technologies, which better retained the nutritional properties of products. The two-stage drying with the combination of convective pre-drying and vacuum-microwave finish drying was investigated for the dehydration of beetroot cubes.…”

Section: Introductionmentioning

confidence: 99%

Effect of two-stage dehydration on retention of characteristic flavor components of flue-cured tobacco in rotary dryer

et al. 2016

View full text Add to dashboard Cite

“…[18] The two-stage dryer using zeolite for air dehumidification was found to be more energy efficient than the one-stage system and current drying systems. [17] Local natural zeolite was proposed as a cheap substitute for expensive synthetic adsorbents also for industrial air drying applications. [19] Hydration and dehydration behaviors of local natural zeolites were investigated for drying and energy storage applications.…”

Section: Introductionmentioning

confidence: 99%

“…[4,[11][12][13] Adsorption drying with zeolite was proposed as an alternative method to improve the energy efficiency of industrial drying. [14][15][16][17][18] The principle of zeolite drying is based on dehumidification of air before feeding to the dryer. At the same time, the air is preheated due to the release of adsorption heat, and the driving force for drying is increased.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Dehydration Behavior of a Natural, Ammonium Hydroxide, and Thermally Treated Zeolitic Tuff

2011

View full text Add to dashboard Cite

Aqueous NH 4 OH-treated and subsequently calcined forms of local natural zeolitic tuff were characterized by different techniques including scanning electron microscopy (SEM), X-ray powder diffraction, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), volumetric N 2 adsorption at À196 C, thermogravimetry (TG), differential scanning calorimetry (DSC), and transmittance infrared spectroscopy. The dehydration behavior of the samples was investigated using an in situ temperature-programmed diffuse reflectance Fourier transform infrared spectroscopy (TP-DRIFTS) method under vacuum. The DRIFTS spectra recorded yielded information about the effect of the NH 4 OH treatment and subsequent calcination on the dehydration behavior of the natural zeolite. Changes in the infrared bands corresponding to vibrations of the OÀH and NÀH bonds upon in situ heating under vacuum were analyzed.Keywords Ammonium hydroxide treatment; Characterization;Clinoptilolite; Dehydration; DRIFTS INTRODUCTIONNatural zeolites constitute a group of minerals having open aluminosilicate frameworks containing channels and cavities that accommodate cations and water molecules. Generally, these cations are exchangeable and the water molecules can be removed or replaced reversibly without disrupting the framework. The presence of water in the pores hinders adsorption of other molecules; thus adsorption and catalytic properties of zeolites are directly related to their water content. Water is adsorbed into zeolites by filling oxygen-lined channels and hydrating the cations present in the channels. The observed macroscopic thermal behavior of a zeolite depends on the type, amount, and position of the extraframework cations within the structure, their coordination to water molecules, their interactions with framework oxygen atoms, the presence of other water molecules, Si=Al ratio, time, temperature, pressure, and heating rate.Dehydration behaviors of clinoptilolite have been investigated by various analytical techniques including

show abstract

Assessment of a Two-Stage Zeolite Dryer for Energy-Efficient Drying

Cited by 19 publications

References 6 publications

Energy Efficient Dryer with Rice Husk Fuel for Agriculture Drying

Energy Efficient Dryer with Rice Husk Fuel for Agriculture Drying

Effect of two-stage dehydration on retention of characteristic flavor components of flue-cured tobacco in rotary dryer

Characterization and Dehydration Behavior of a Natural, Ammonium Hydroxide, and Thermally Treated Zeolitic Tuff

Contact Info

Product

Resources

About