Crystal sinking modeling for designing iodine crystallizer in thermochemical sulfur-iodine hydrogen production process

Byung Heung Park, Seong Uk Jeong, Jeong Won Kang

Research output: Contribution to journalArticle

Abstract

SI process is a thermochemical process producing hydrogen by decomposing water while recycling sulfur and iodine. Various technologies have been developed to improve the efficiency on Section III of SI process, where iodine is separated and recycled. EED(electro-electrodialysis) could increase the efficiency of Section III without additional chemical compounds but a substantial amount of I2 from a process stream is loaded on EED. In order to reduce the load, a crystallization technology prior to EED is considered as an I2 removal process. In this work, I2 particle sinking behavior was modeled to secure basic data for designing an I2 crystallizer applied to I2-saturated HIx solutions. The composition of HIx solution was determined by thermodynamic UVa model and correlation equations and pure properties were used to evaluate the solution properties. A multiphysics computational tool was utilized to calculate particle sinking velocity changes with respect to I2 particle radius and temperature. The terminal velocity of an I2 particle was estimated around 0.5 m/s under considered radius (1.0 to 2.5 mm) and temperature (10 to 50 °C) ranges and it was analyzed that the velocity is more dependent on the solution density than the solution viscosity.

Original languageEnglish
Pages (from-to)768-774
Number of pages7
JournalKorean Chemical Engineering Research
Volume52
Issue number6
DOIs
Publication statusPublished - 2014 Jan 1

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Crystallizers
Hydrogen production
Iodine
Sulfur
Electrodialysis
Crystals
Water recycling
Chemical compounds
Crystallization
Hydrogen
Thermodynamics
Viscosity
Temperature
Chemical analysis

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Crystal sinking modeling for designing iodine crystallizer in thermochemical sulfur-iodine hydrogen production process. / Park, Byung Heung; Jeong, Seong Uk; Kang, Jeong Won.

In: Korean Chemical Engineering Research, Vol. 52, No. 6, 01.01.2014, p. 768-774.

Research output: Contribution to journalArticle

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AB - SI process is a thermochemical process producing hydrogen by decomposing water while recycling sulfur and iodine. Various technologies have been developed to improve the efficiency on Section III of SI process, where iodine is separated and recycled. EED(electro-electrodialysis) could increase the efficiency of Section III without additional chemical compounds but a substantial amount of I2 from a process stream is loaded on EED. In order to reduce the load, a crystallization technology prior to EED is considered as an I2 removal process. In this work, I2 particle sinking behavior was modeled to secure basic data for designing an I2 crystallizer applied to I2-saturated HIx solutions. The composition of HIx solution was determined by thermodynamic UVa model and correlation equations and pure properties were used to evaluate the solution properties. A multiphysics computational tool was utilized to calculate particle sinking velocity changes with respect to I2 particle radius and temperature. The terminal velocity of an I2 particle was estimated around 0.5 m/s under considered radius (1.0 to 2.5 mm) and temperature (10 to 50 °C) ranges and it was analyzed that the velocity is more dependent on the solution density than the solution viscosity.

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