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Open AccessArticle

Stop Smoking—Tube-In-Tube Helical System for Flameless Calcination of Minerals

1
Institute for Reactor Safety and Reactor Technology, RWTH Aachen University, 52072 Aachen, Germany
2
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 10084, China
3
Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich, Wilhelm-Johnen-Straße, 52425 Jülich, Germany
*
Author to whom correspondence should be addressed.
Processes 2017, 5(4), 67; https://doi.org/10.3390/pr5040067
Received: 28 August 2017 / Revised: 11 October 2017 / Accepted: 31 October 2017 / Published: 3 November 2017
Mineral calcination worldwide accounts for some 5–10% of all anthropogenic carbon dioxide (CO2) emissions per year. Roughly half of the CO2 released results from burning fossil fuels for heat generation, while the other half is a product of the calcination reaction itself. Traditionally, the fuel combustion process and the calcination reaction take place together to enhance heat transfer. Systems have been proposed that separate fuel combustion and calcination to allow for the sequestration of pure CO2 from the calcination reaction for later storage/use and capture of the combustion gases. This work presents a new tube-in-tube helical system for the calcination of minerals that can use different heat transfer fluids (HTFs), employed or foreseen in concentrated solar power (CSP) plants. The system is labeled ‘flameless’ since the HTF can be heated by other means than burning fossil fuels. If CSP or high-temperature nuclear reactors are used, direct CO2 emissions can be divided in half. The technical feasibility of the system has been accessed with a brief parametric study here. The results suggest that the introduced system is technically feasible given the parameters (total heat transfer coefficients, mass- and volume flows, outer tube friction factors, and –Nusselt numbers) that are examined. Further experimental work will be required to better understand the performance of the tube-in-tube helical system for the flameless calcination of minerals. View Full-Text
Keywords: tube-in-tube helical system; double-pipe; flameless calcination; mineral processing; parameter study; concentrated solar power; high-temperature reactor; solar salt tube-in-tube helical system; double-pipe; flameless calcination; mineral processing; parameter study; concentrated solar power; high-temperature reactor; solar salt
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MDPI and ACS Style

Haneklaus, N.; Zheng, Y.; Allelein, H.-J. Stop Smoking—Tube-In-Tube Helical System for Flameless Calcination of Minerals. Processes 2017, 5, 67.

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