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ES-FuelCell2013-18143_Ricardo Sebastian Gonzalez

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Sebastián González

on 1 August 2013

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Transcript of ES-FuelCell2013-18143_Ricardo Sebastian Gonzalez

Cemex Colombia Cemex Research Group AG Switzaerland
Operations Vice-presidency Production Technologies Direction
Improvement and Sustainability Div. Technology Vice-presidency

Transforming our world
for a better future
photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Cement Process at a Glance
Technical and Economic Feasibility Analysis of Using Concentrated Solar Thermal Technology in the Cement Production Process: Hybrid approach – A case study
Ricardo Sebastián González Gilles Flamant
Regional Process Advisor for Latam Direrctor
Cemex Latam Holdings PROMES - France
The scenario with 45% of thermal losses should be discarded since the IRR is lower than the minimum expected by most of the equity investors in renewable energy projects (between 8% and 12%).

Why CST for Cement Process?

Environmental issues
Concrete is the second only to water in total volumes consumed by society.
Cement industry produces significant releases to the environment, primarily CO2
Cement process consumes huge quantities of fossil fuels.
Solar Reactor scaling-up
Additional trials should be done at higher scales until reach finally the industrial scale.

Calcined Meal Storage
Current technology oriented to molten salts, phase change materials and solid materials.

Solar Cement Plant Design
How to apply CST in cement process?

Multi-tube rotary kiln prototype
Falling Particle Receiver
Solar Reactors models used in CaCO3 decomposition
The solar reactor to be located at the top of the tower was chosen under the following criteria:
High thermal energy efficiency
High development level

Redirecting solar beams to a solar reactor
Hot Gases from the Solar Receiver
Operating mode with external receiver
How to apply CST in cement process?
Solar calcined raw meal to storage silo
Solar calcined raw meal to the kiln
Preheated raw meal

Hot Gases from the Solar Receiver
Operating mode with external receiver
Solar calcined raw meal to storage silo
Solar calcined raw meal to the kiln
Preheated raw meal
Go Process
Thermal Storage
Calcined Raw Meal
PreheatedRaw Meal
Fresh Raw Meal
Key ecuations
Raw and Calcined Meal transportation
Raw meal and calcined meal are at high temperatures, around 800°C and 900°C respectively.

What kind of transportation should be used?

Technical Risk Analysis
Plant definition
Control Volume
Economic feasibility and Sensitivity Analysis
Total Investment and O&M Costs
Weight distribution of Investmetn Costs
Cement Process at a glance
Why CST for Cement Process?
How to apply CST in Cement Process
Solar Cement Plant Design
Technical Risk Analysis
Hot Gases
Both, PBT and IRR, show a strong dependence with Coal Price variations. This influence is even emphasized for the IRR when Coal Price varies positively
Decarbonation reaction
It requires 3182 kJ/kg of CaO
fuel injection (60%)
fuel injection (40%)
Calculated Operating Temp: 1650°C – 2800°C
Development: commercial installations @ 400°C – 600°C
Thermal losses:47% - 68%
Calculated Operating Temp: 900°C
Development: commercial scale without solar reactor
Thermal losses: 15%-45%
The Technical assessment together with the technology risk analysis show as a result that it is feasible to use Concentrated Solar Thermal Technology in the selected plant.
In order to meet the estimated IRR and PBT a solar multitube rotary kiln must be used.
The approach to be considered must be the Central Tower with solar reactor and thermal storage with hot calcined meal (Process Go)
The use of CST under the proposed approach, does not imply radical changes in the conventional process and allows fuel substitution as much as required.
Production and Economic issues
Costs of fuel consumption.
Technologies for gas mitigation require high investment.
Technical issues
CST allows to reach the high operating temperatures required for the process
It is possible to operate during 24 hours/day with thermal storage

@ 900°C
Thank you very much!!!

And now....

Your Questions!!
Full transcript