Hybrid journal (It can contain Open Access articles) ISSN (Print) 1743-4939 - ISSN (Online) 1743-4947 Published by Inderscience Publishers[439 journals]
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Authors:Nitesh Goswami, Soumitra Kar, R.C. Bindal, P.K. Tewari Pages: 1 - 11 Abstract: The objective of this work was to assess the impact of deviations from isothermality in packed bed and coated wall membrane reactors on the rates of HI decomposition. A two-dimensional modelling was done for a packed bed membrane reactor as well as a coated wall membrane reactor for HI decomposition. The smaller diameter reactor showed higher apparent catalyst activity. The reactivity results showed that the reactors suffered from significant temperature gradients. We estimated the diameter required for packed bed and coated wall membrane reactors to achieve near isothermal operation. The coated wall reactor gives lower conversion than the packed bed reactor. The model confirmed that the measured catalyst activities in different diameter reactors varied due to heat transfer and pressure drop effects. Keywords: hydrogen production; energy; packed bed membrane reactors; thermochemical cycles; iodine sulphur process; reactor modelling; hydrogen iodide decomposition; catalyst activity; non-isothermality; coated wall membrane reactors; temperature gradients; heat tran Citation: International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 1 - 11 PubDate: 2016-08-17T23:20:50-05:00 DOI: 10.1504/IJNHPA.2016.078423 Issue No:Vol. 3, No. 1 (2016)
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Authors:A. Shriniwas Rao, S. Sujeesh, Nafees A. Vakil, H.Z. Fani, A. Sanyal, P.K. Tewari, L.M. Gantayet Pages: 12 - 31 Abstract: The iodine-sulphur (IS) thermo-chemical process is being studied as a potential process for production of hydrogen by water splitting. It consists of three chemical reactions: 1) Bunsen reaction, which is the acid production step, 2) sulphuric acid decomposition to produce oxygen; 3) hydrogen iodide decomposition to produce hydrogen. In this work, a detailed parametric study of the Bunsen reaction is presented, which was carried out in agitated reactor (ABR) in counter current mode of operation. Experiments have been carried out in the reactor at different temperatures by varying the sulphur dioxide (SO<SUP align="right">2</SUP>) flow rate and partial pressure of SO<SUP align="right">2</SUP>. Bunsen reaction rate and SO<SUP align="right">2</SUP> conversion are calculated experimentally from feed rate and scrubbing rate of SO<SUP align="right">2</SUP>. It has been observed that the reaction rate and SO<SUP align="right">2</SUP> conversion increase with increase in SO<SUP align="right">2</SUP> flow, increase in SO<SUP align="right">2</SUP> partial pressure and decrease in temperature. 'Tanks-in-series' model, one of the non-ideal reactor models, has been proposed to describe the ABR reaction system. The model has been validated with experimental results. This approach can be useful for the design and scaling up of the agitated reactor. Keywords: iodine-sulphur process; thermo-chemical cycle; heterogeneous Bunsen reaction; continuous stirred tank reactors; CSTR; plug flow reactors; PFR; agitated Bunsen reactors; ABR; average reaction rate; hydrogen production; water splitting; sulphuric acid deco Citation: International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 12 - 31 PubDate: 2016-08-17T23:20:50-05:00 DOI: 10.1504/IJNHPA.2016.078424 Issue No:Vol. 3, No. 1 (2016)
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Authors:A. Shriniwas Rao, S. Sujeesh, A. Sanyal, P.K. Tewari, L.M. Gantayet Pages: 65 - 79 Abstract: Agitated Bunsen reactor (ABR) is one of the reactor alternatives to carry out Bunsen reaction of iodine-sulphur thermo-chemical process for hydrogen production. It is a tubular reactor with multiple agitating blades on a common shaft to enhance the radial mixing and with an inside helical coil arrangement to remove the exothermic Bunsen reaction heat. The effective heat removal from the reactor depends on the agitation speed and velocity of fluids flowing inside the reactor and through the helical coil. Experiments are carried out in ABR, for heat transfer study with water as reactor fluid as well as helical coil fluid and also Bunsen reaction heat transfer study, by varying the operating parameters such as agitation speed, velocity of reactor fluid and velocity of helical coil fluid. It has been observed that the overall heat transfer coefficient increases with increase in agitation speed and fluid velocities. Combined effect of agitation speed and fluid velocities on heat transfer rate, in shell side/reactor side of ABR, has been presented in the form of modified correlation. Keywords: Bunsen reaction; agitated Bunsen reactors; ABR; heat transfer coefficient; helical coil; iodine-sulphur process; agitation speed; fluid velocity; thermo-chemical cycle; hydrogen production Citation: International Journal of Nuclear Hydrogen Production and Applications, Vol. 3, No. 1 (2016) pp. 65 - 79 PubDate: 2016-08-17T23:20:50-05:00 DOI: 10.1504/IJNHPA.2016.078425 Issue No:Vol. 3, No. 1 (2016)
Hybrid journal (It can contain Open Access articles)
[439 journals]
