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Thermochemical Production of Sulfur as Solar fuel: Design and development of moving bed heat exchanger for sulfuric acid evaporation heated by ceramic particles

Thanda, Vamshi Krishna (2018) Thermochemical Production of Sulfur as Solar fuel: Design and development of moving bed heat exchanger for sulfuric acid evaporation heated by ceramic particles. Master's, University of Duisburg-Essen.

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Abstract

In the context of solar energy systems, concentrated solar thermal power plants offer sustainable, low carbon energy technologies to generate baseload electricity. In next generation receivers developed at DLR, granular particles are used as thermal energy storage medium as they may store and transport the heat at high temperatures. In this presented work, a new concept of a moving bed heat exchanger (MBHE) is developed for the sulfuric acid vaporization with ceramic particles as the heat transfer media. Based on a literature Research several concepts are compared eventually selecting a tube and shell ountercurrent heat-exchanger. As the hot ceramic particles flow downwards along the tubes, the heat from them is used to evaporate sulfuric acid (H2SO4) into Sulfur trioxide and water (SO3+H2O) inside the tube-type reactor, which is a section in the process of thermo-chemical production of sulfur. Being a highly corrosive fluid by nature, precautions were taken in dealing with the material selection of the tubes and the tube inlets where direct contact with the sulfuric acid is expected. Based on the correlations of flow boiling heat transfer coefficient and particle bed heat transfer coefficient, a system model was developed and implemented with the commercial software package Engineering Equation Solver (EES) which is coupled with a program for thermal design of the MBHE. The complete model is discretized into four zones depending on the energy balance. As the mass flow rate plays a key role, different associated parameters are analyzed in order to design the geometry of the system (e.g. tube length, diameter and arrangement). When the particles reach the bottom of the MBHE, they cool down and exit from a hopper. This hopper is designed considering the rheological properties of the ceramic particles and a suitable feeder is selected, which is connected below the hopper to regulate the mass flow rates of the particles. Finally, for a selected mass flow rate a complete design of the sulfuric acid evaporator is implemented in the CAD software Autodesk Inventor®.

Item URL in elib:https://elib.dlr.de/122970/
Document Type:Thesis (Master's)
Title:Thermochemical Production of Sulfur as Solar fuel: Design and development of moving bed heat exchanger for sulfuric acid evaporation heated by ceramic particles
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Thanda, Vamshi KrishnaVamshi.Thanda (at) dlr.deUNSPECIFIED
Date:23 July 2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:119
Status:Published
Keywords:Sulfur, Solar Fuel, thermochemical production, concentrated solar, heat exchanger, moving bed, particles
Institution:University of Duisburg-Essen
Department:nstitute for Materials Science, Department of Energy Technology
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:09 Nov 2018 15:36
Last Modified:09 Nov 2018 15:36

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