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Investigation of the Hydrodynamics of a 1 MWth Circulating Fluidized Bed Pilot Plant

Daikeler, Alexander and Ströhle, Jochen and Epple, Bernd (2018):
Investigation of the Hydrodynamics of a 1 MWth Circulating Fluidized Bed Pilot Plant.
In: 23rd International Conference on Fluidized Bed Conversion, Seoul, Südkorea, 13.-17.05.2018, [Conference or Workshop Item]

Abstract

A water-cooled capacitance probe measurement system has been developed in order to conduct inbed flow pattern measurements within two circulating fluidized bed (CFB) reactors of a 1 MWth pilot plant. Several processes like carbonate looping, chemical looping, gasification and fluidized bed combustion are investigated at this test rig. In this paper, profile measurements conducted during a long term carbonate looping test campaign are presented. Furthermore, extensive measurements are shown, which were conducted within a scaled cold flow model of the pilot plant. Here, four different particles had been used as bed material. These included limestone, corn grit and two different size distributed glass beads. The particles are analysed in detail, especially focusing on their suitability to scale the 1 MWth experiments. Therefore, they are compared to each other regarding their dimensionless numbers according to the Glicksman scaling laws. Finally, the flow structures for the different particle systems are compared to each other, thus enabling to determine systematic differences, which are caused due to differing characteristics of the particles. A smaller size of the small glass bead fraction lead to higher measured particle velocities with this particle system. Furthermore, the very different corn grit particles lead to very similar flow structures than the limestone and large glass bead fraction. A comparison of the hydrodynamics in the hot and cold CFB units showed the highest similarity for the small glass bead fraction, which well matches the Glicksman scaling laws. Eventually, the capacitance probe system proved to be a highly suitable instrument to investigate the flow conditions within industrial scale CFB units under real operating conditions.

Item Type: Conference or Workshop Item
Erschienen: 2018
Creators: Daikeler, Alexander and Ströhle, Jochen and Epple, Bernd
Title: Investigation of the Hydrodynamics of a 1 MWth Circulating Fluidized Bed Pilot Plant
Language: English
Abstract:

A water-cooled capacitance probe measurement system has been developed in order to conduct inbed flow pattern measurements within two circulating fluidized bed (CFB) reactors of a 1 MWth pilot plant. Several processes like carbonate looping, chemical looping, gasification and fluidized bed combustion are investigated at this test rig. In this paper, profile measurements conducted during a long term carbonate looping test campaign are presented. Furthermore, extensive measurements are shown, which were conducted within a scaled cold flow model of the pilot plant. Here, four different particles had been used as bed material. These included limestone, corn grit and two different size distributed glass beads. The particles are analysed in detail, especially focusing on their suitability to scale the 1 MWth experiments. Therefore, they are compared to each other regarding their dimensionless numbers according to the Glicksman scaling laws. Finally, the flow structures for the different particle systems are compared to each other, thus enabling to determine systematic differences, which are caused due to differing characteristics of the particles. A smaller size of the small glass bead fraction lead to higher measured particle velocities with this particle system. Furthermore, the very different corn grit particles lead to very similar flow structures than the limestone and large glass bead fraction. A comparison of the hydrodynamics in the hot and cold CFB units showed the highest similarity for the small glass bead fraction, which well matches the Glicksman scaling laws. Eventually, the capacitance probe system proved to be a highly suitable instrument to investigate the flow conditions within industrial scale CFB units under real operating conditions.

Uncontrolled Keywords: hydrodynamics of circulating fluidized bed, in-furnace measurements in 1 MWth pilot plant, scaling of fluidized beds, cold flow experiments
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institut für Energiesysteme und Energietechnik (EST)
Event Title: 23rd International Conference on Fluidized Bed Conversion
Event Location: Seoul, Südkorea
Event Dates: 13.-17.05.2018
Date Deposited: 01 Oct 2018 13:40
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