CaOling Project - First experiences on the 1,7MWt calcium looping pilot in La Pereda

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1 endesa Subdirección de Ingeniería e I+D CaOling Project - First experiences on the 1,7MWt calcium looping pilot in La Pereda A. Sánchez-Biezma *, L. Diaz **, J. López ***, B. Arias****, J. Paniagua*, M.Lorenzo**, J. Álvarez ***, J.C. Abanades **** *Endesa Generación, Madrid, Spain. **HUNOSA, Oviedo, Spain ***Foster Wheeler Energía S.L.U, Madrid, Spain. **** Spanish Research Council (CSIC-INCAR), Oviedo, Spain.

2 CaOling Project - Development of Calcium looping CaOling Project started on December 2009 as a threeyears project to develop and demonstrate postcombustion calcium looping in a pilot-scale unit which is fully integrated with a power plant. Partners: 2

3 Concept Flue gas without CO 2 Concentrated CO 2 EXISTING POWER PLANT Flue Gas (F CO2 ) CARBONATOR CaCO 3 CaO OXY-FIRED CFBC CALCINER O 2 Coal Air CaCO 3 (F 0 ) CaO Purge Coal N 2 ASU Air 3

4 CaOling Project. Work plan Leader Other partners WP1: Lab-Scale pilot testing WP2: Sorbent Properties WP3: Reactor modelling and scale-up tools WP4: 1,7MWt Plant design and erection WP5: Experimental campaigns in the 1,7Mw test facility WP6: Scaling parameters for industrial plant demo WP7: Coordination and dissemination All 4

5 La Pereda CO2 capture pilot plant - Location 5

6 La Pereda CO2 capture pilot plant The 1,7MWt experimental facility is located at the La Pereda power plant. La Pereda is an existing 50MWe CFB power plant. Facility Area 6

7 La Pereda pilot plant - Concept 7

8 La Pereda CO2 capture pilot plant - Main equipment Gas inlet tie point Gas outlet tie point ESP stack Reactors Metallic structure Pipes and gas cooler

9 La Pereda CO2 capture pilot plant - Main equipment Solid removal system Gas outlet tie CO2Burners y Opoint and valve 2 Tanks skids Reactors ESP stack Coal and limestone feeding system

10 La Pereda CO2 capture pilot plant - Main equipment Propane Tank Control and electric systems room Gas outlet tie point Fans Solid removal system ESP stack O2 & CO2 tanks

11 La Pereda pilot plant STATUS Status of the pilot plant -Building finished in September Start of cold commissioning: October Start of hot commissioning: January Operational hours with coal combustion (dual fluidized bed mode): ~ 800 h - Operational hours in CO2 capture mode : ~ 160 h -Initial test carried out with the calciner in air mode - First validation under oxy mode in the calciner Main parameters in the carbonator reactor during CO2 capture tests Carbonator temperature (ºC) Carbonator superficial gas velocity (m/s) Inlet CO2 volume fraction Inlet SO2 concentration (mg/m3) Inventory of solids in the carbonator (kg m-2) Maximum CO2 carrying capacity of the solids CO2 capture efficiency SO2 capture efficiency

12 Results dynamic testing Effect of carbonator temperature : ECO2 eq ECO2 Carbonator Temperature 11:10 11:20 11: :40 11: CO2 capture efficiency CO2 capture efficiency ECO2 eq ECO2 0.4 Carbonator inventory : :10 17:20 17:30 17:40 Inventory of solids (kg/m2) 730 Carbonator temperature (ºC) 1 Effect of inventory of solids on the carbonator

13 Results steady state testing ECO2 eq Deliberate alteration of solid circulation rates ECO2 0.4 Restart of solid circulation CO2 in 9 6 CO2 out Subdirección de10:00:00 ingeniería e I+D 11:00: :00:00 13:00:00 14:00:00 15:00:00 16:00:00 CO2 vol% CO2 capture efficiency - Total inventory of solids in carbonator = kg/m2 - Average carbonator temperature= 670 ºC - Xave =

14 Results SO2 capture SO2 capture in the Ca-looping facility XCaSO4 ESO ESO2 carb ESO2 calc Experimental Calculated :00 0 5:00 7:00 9:00 11:00 13:00 15:00

15 Evolution of sorbent utilization with lifetime of particles in the system 0.4 XCaSO4 experimental XCaSO4 calculated 800 CaO utilization ECO2 eq ECO2 200 Carbonator inventory 11: :20 11:30 11:40 11:50 12: N th Number of times that the inventory of CaO is carbonated up to Xave t FCO 2 Ecarb (t ) 0 N Ca X ave N th dt 2 Xave XN (Grasa et al 2006) ECO2 Xave, XN, X CaSO Inventory of solids (kg/m ) 1 0.6

16 Results oxycalcination Calcination oxy mode Calcination air mode 16

17 A flexible experimental facility has being constructed in La Pereda Power Plant aiming to validate the technology in the 1MW s size Successful proof of concept of postcombustion Ca-looping in continuous mode of operation with two interconnected CFBCs at the MWth scale. CO2 capture efficiencies over 90% achievable in a CFB carbonator reactor operating with standard solids, bed inventories, gas velocities and solid circulation rates. SO2 capture in the CFB carbonator over 95%.

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