Adsorbents Evaluation by a Circulating Fluidized Bed System

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1 Nano CaO-based CO 2 Adsorbents Evaluation by a Circulating Fluidized Bed System Su Fang Wu Ph.D., Professor Yu Yao Shi, Rong Wu, Xiao Chong Xue, Yan Wang Department of Chemical and Biological Engineering Zhejiang University, Hangzhou, , China wsf@zju.edu.cn

2 Main works--- From material to process ReSER Process for Hydrogen production Nano CaO-based CO 2 adsorbent CO 2 capture in flue gas CaO + CO2 Û CaCO3 D H 298 = kj / mol Others 1

3 Related works during Adsorbent/catalyst developments: Nano CaO reactive with CO 2 New model S. F. Wu, P. Q. Lan, AIChE J. 2012, 58(5): Expending pore of nano CaO adsorbent Q. Tang, S. F. Wu, JCESU,2012,12(1) :31-37 Nano CaO grain characteristics and growth model Y. Q. Zhu, S. F. Wu, X.Q.Wangl, Chem Eng J., 2011,175(15): a Ca 12 Al 14 O 33 Nano-layer and Its Effect on the Attrition Behavior Su F. Wu,Ming Z. Jiang, IEC Res. 2010, 49(23), ZrO 2 -modified Ni nano-cao sorption complex catalyst S. F. Wu, L. L. WangInt. J. Hydrogen Energy, 2010,35(13): CaTiO 3 /Nano-CaO as a CO 2 adsorbent Su. F. Wu, Yan. Q. Zhu, Behavior, IEC Res. 2010,49(6): A micro-sphere catalyst complex with nano CaCO 3 S. F. Wu, L.B. Li,Y. Q. Zhu,X.Q. Wang, Eng. Sci., 2010,8(1):22-26 improve the sorption capacity / durability / attrition lost 2 Increase the sorption rate and decrease the decomposition temperature

4 Nano CaO-based CO 2 adsorbent for CO 2 capture/ in ReSER for H 2 production Micro CaO Nano CaO Attrition lost < 3.5% (2012) Advantages: Fast reaction rate More durability of CO 2 sorbent Low Attrition lost Continuation of reaction and regeneration CFB for CO 2 capture CaO-based CO 2 sorbent 3

5 Targets: Establishing a system of circulating fluid bed(cfb) and evaluation the nano CaO-based adsorbent for CO 2 capture. 4

6 Reactor:40mm Height:3-5m Regenerator:50mm Height:3-5m Fig.1 Cold model circulating fluidized bed reactor system 5

7 The relation of pressure drop and velocity m 0.50m 0.75m 1.00m 1.25m 1.50m 8 7 P(Kpa) V(m/s) Fig.2 Different height of adsorbent of the reactor 6

8 The efficiency of the Cyclone separation η efficiency of the Cyclone separation >90% V(m/s) Fig.3 Velocity and the efficiency of the cyclone separation 7

9 Fluidized bed system for CO 2 capture Capacity: 1000L/hr Fig. 4 8

10 The cold model experiment in CFB The test of the adsorbent flux in the regeneration reactor 26 P1 (kpa) P = W S m= P m (kg) Fig. 5 P1 vs the adsorbent amount in the regeneration reactor 9

11 The cold model experiment in CFBR P3 (kpa) Table 1 The results of the circulation experiments Circulation quantity(g/min) P1 (kpa) Adsorbent amount in the regeneration reactor(kg)

12 Blank experimental results of CO 2 content C CO2 ( %) CCO 2 =7.7% C CO2 ( %) 20 CCO 2 =20% t(s) t(s) Fig. 6 The experimental data in empty tower 11

13 Adsorption conditions of the hot experiments Table 2 The sorption situation in a single tower Sorption temperature 550 ±5 600 ±5 Weight of adsorbent / CO 2 partial pressure 400g/ MPa 500g/ MPa 300g/ MPa 400g/ MPa 500g/ MPa 500g/ 0.02MPa 600g/ 0.02MPa 12

14 The hot experimental results in CFBR 8 500g,0.0077MPa C CO2 (%) t(s) Fig. 7 The output concentration of CO 2 at different temperatures(500g,0.0077mpa) 13

15 The sorption experiment in a single tower Table 3 Adsorption efficiency to CO 2 under different CO 2 partial pressures (500g,600 ) 0.02MPa MPa Adsorption Adsorption Time(s) efficiency (%) Time(s) efficiency (%)

16 The sorption experiment in a single tower Time (s) Table 4 Adsorption efficiency to CO 2 with different qualities of adsorbent(600,0.0077mpa) 8 600,0.0077MPa 300g 400g 500g 7 Adsorption 6 efficiency 5 (%) C CO2 (%) g 400g 500g Time (s) Adsorption efficiency (%) Time (s) Adsorption efficiency (%) t(s) Fig. 8 The output concentration of CO 2 with different qualities of adsorbent(600,0.0077mpa) 15

17 The CO 2 capture experimental results using an CO 2 online monitor Fig. 9 16

18 Table 5 Adsorbent 300g (temperature 600,CO2 content 7.7%) time/s temperature CO 2 content CO 2 content CO 2 % (blank data) % adsorption efficiency,% Table 6 adsorbent 500g (temperature 600,CO2 content 7.7%) time/s temperature CO 2 content % CO 2 content (blank data) % CO 2 adsorption efficiency % 17

19 The sorption experiment in a single tower Table 7 The best result comparison of the circulating fluidized bed reactor(cfbr) and the fixed bed reactor (FBR) CFBR FBR Gas velocity(m/s) Residence time(s) Input CO 2 concentration(%) W/V (g min ml -1 ) Output CO 2 concentration (%) Adsorption efficiency(%) <1 0 >85 100% 18

20 Summary: 1. The nano CaO-based CO 2 adsorbent can be used in circulating fluid bed system for CO 2 capture. 2. In the CFBR, CO 2 content in the out flow gas is lower than 1%, and CO 2 sorption efficiency is over 85%. 3. An continues CO 2 capture was achieved by a CFBR. 19

21 Acknowledgements

22 Thank you for your attention!

A Kinetic Model of Nano-CaO Reactions with CO 2 in a Sorption Complex Catalyst

A Kinetic Model of Nano-CaO Reactions with CO 2 in a Sorption Complex Catalyst S. F. Wu and P. Q. Lan Dept. of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China DOI 10.1002/aic.12675