Institute of Combustion and Power Plant Technology Prof. Dr. techn. G. Scheffknecht Matthias Hornberger, Reinhold Spörl, Günter Scheffknecht CCS in cement industry – Application of the Calcium Looping Technology TCCS9, 12 th to 14 th September 2017, Trondheim
15
Embed
CCS in cement industry – Application of the Calcium ... · CCS in cement industry –Application of the Calcium Looping ... CEMENT plant Raw meal CaO ... CCS in cement industry
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Institute of Combustion and Power Plant Technology
Prof. Dr. techn. G. Scheffknecht
Matthias Hornberger, Reinhold Spörl,
Günter Scheffknecht
CCS in cement
industry – Application
of the Calcium Looping
Technology
TCCS9, 12th to 14th September 2017, Trondheim
2University of Stuttgart - Institute of Combustion and Power Plant Technology -
• Cement production constitute
~5 % of global anthropogenic
CO2 emissions
• CO2 emissions:
• 60 % by raw materials
• 40 % by fuel
• Reduction of CO2 emissions:
• 56 % CCS
• 44 % by increase of energy
efficiency, alternative fuels,
reduction of clinker share
Clinker manufacturing
M. Sc. Matthias Hornberger
Raw meal
Cyclone
preheater
Flue gas
Calciner
Tertiary air duct
Cooler exhaust gas
Fuel/air
Fuel
Cooling air
Rotary kiln 2000 °C
300 - 350 °C
700 - 1000 °C
200 °C - 350 °C
850 °C
700 - 1000 °C
Clinker
CaCO3,SiO2,
Al2O3, Fe2O3
20 - 34 % CO2
Calcium – Looping
4University of Stuttgart - Institute of Combustion and Power Plant Technology -
• CO2 capture by cyclic calcination and carbonation of Calciumcarbonat (CaCO3)
• High energy efficiency due to high temperature level
Calcium Looping – General Process Description
M. Sc. Matthias Hornberger
5University of Stuttgart - Institute of Combustion and Power Plant Technology -
Integrated CaL
Calcium Looping – Cement Plant Integration
M. Sc. Matthias Hornberger
• Cement plants’ raw meal completely calcined by
CaL process
• High make-up ratio realizable
• Higher energy efficiency and higher complexity
compared to tail-end
• Entrained flow reactors or CFB reactors with
additional milling step if necessary
Clinker
cooler
Ca
lcin
er
Raw
meal
fuelO2
Ca
rbo
na
tor
CO2 depleted
flue gas
CO2 to CPU
clinker
6University of Stuttgart - Institute of Combustion and Power Plant Technology -
• Part of raw meal calcined in CaL process
• CO2 flue gas concentration ~ 20 - 35 %
• Easy integration
• Reduced energy efficiency
Tail-end CaL
Calcium Looping – Cement Plant Integration
M. Sc. Matthias Hornberger
clinker
Ca
lcin
erCaCO3
fuelO2
Ca
rbo
na
tor
CO2 depleted
flue gas
CO2 to CPU
CEMENT
plant
Raw
meal
CaO
Flue gas
Results
8University of Stuttgart - Institute of Combustion and Power Plant Technology -
Experimental results – Experimental facility
M. Sc. Matthias Hornberger
200 – 230 kWth pilot scale facility (3 reactors)
Bubbling bed reactor (1x)
• diameter: 330 mm
• height: 6 m
Circulating fluidized bed reactor (2x)
• diameter: 200 mm
• height: 10 m
Possible reactor configuration: CFB-CFB, BFB-CFB
No electrical heating (heated by combustion)
Gas analysis (H2, CO, CH4, O2, CO2, CxHy, SO2, NOX)
9University of Stuttgart - Institute of Combustion and Power Plant Technology -
Experimental results – CO2 capture
M. Sc. Matthias Hornberger
• CO2 capture was limited by the equilibrium CO2 capture
• High CO2 capture rate above 90 % reached
• High sorbent activity due to high make-up flows
10University of Stuttgart - Institute of Combustion and Power Plant Technology -
Simulation results*
M. Sc. Matthias Hornberger
Reference cement
plant w/o CO2
capture
tail-end CaL
configuration
integrated CaL
configuration
Integration level [%] -- 20 100
F0/FCO2 -- 0.16 4.1
FCa/FCO2 -- 4.8 4.0
Carbonator CO2 capture efficiency [%] -- 88.8 80.0
Total fuel consumption [MJLHV/tclk] 3223 8672 4740