Simulation of Aggregate Structure Evolution of Calcium-Based Absorbent Based on Sintering Mechanism

doi:10.19894/j.issn.1000-0518.230151

Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (12): 1726-1736.DOI: 10.19894/j.issn.1000-0518.230151

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Simulation of Aggregate Structure Evolution of Calcium-Based Absorbent Based on Sintering Mechanism

Jie JI, Ming-Chun LI(), Cun-Liang SHEN, Xin YANG

College of Materials Science and Engineering，Shenyang University of Technology，Shenyang 110023，China

Received:2023-05-22 Accepted:2023-11-13 Published:2023-12-01 Online:2024-01-03
Contact: Ming-Chun LI
About author:mingchunlihlj@163.com
Supported by:
the National Natural Science Foundation of China(51874200);Liaoning Bai Qian Wan Talents Program(XLYC2008014);Liaoning Revitalization Talents Program(XLYC1907080)

Abstract

Abstract:

Calcium cycling is a kind of decarbonization technology with great potential application， but the sintering phenomenon between the grains of the absorbers will be intensified with the cycling， resulting in the decay of mesopores and the carbon capture capacity. According to the formation and evolution characteristics of the surface and interface structures of calcium-based absorbent during calcination， the topological structure of regenerated CaO pore channels and the sintering model of hierarchical agglomerates are constructed. The influence of dihedral angle is introduced， and the pore migration rule of calcium-based absorbent under different sintering mechanisms is discussed and verified by experiments. The results show that the sintering of regenerated CaO is controlled by surface-boundary-volume diffusion. The mathematical model reveals the dynamic evolution of pore structures of calcium-based absorbers. The maximum average relative error of absorbers with diameters of 75~150 μm （pore diameters of 25~75 nm） between simulation and experimental results at 900 ℃ and different sintering time （300~600 s） is 16.50%. The relative error corresponding to the maximum aperture is within 6%. Under the same sintering conditions， the neck growth of each particle grade （38~75， 75~150， 150~180 μm） shows obvious three-stage growth， and the neck growth rate shows a rapid growth in the early stage and a gradual trend in the late stage， and the sintering between particles would intensify with the decrease of the particle pole of the absorber.

Key words: Calcium oxide sintering, Pore size distribution, Sintering mechanism, Numerical simulation

CLC Number:

O649.1

Jie JI, Ming-Chun LI, Cun-Liang SHEN, Xin YANG. Simulation of Aggregate Structure Evolution of Calcium-Based Absorbent Based on Sintering Mechanism[J]. Chinese Journal of Applied Chemistry, 2023, 40(12): 1726-1736.

Figures/Tables 11

Fig.1 Sintering physical model

Fig.2 Double sphere geometric model

Fig.3 Pores and pore sections in the initial accumulation stage

Table 1 Calculation parameters in sintering model

Parameter	D_s/（cm²·s^-1）^［35］	D_v/（cm²·s^-1）^［35］	$γ s$ /（cm²·s^-1）^［27］	Ω/cm^{3 ［36］}	ψ/（°）	k/（J·K^-1）
Value	8.5×10^-11	1.667×10^-15	1.5×10^-4	1.72×10^-23	5π/6~π	1.38×10^-23

Table 1 Calculation parameters in sintering model

Parameter	D_s/（cm²·s^-1）^［35］	D_v/（cm²·s^-1）^［35］	$γ s$ /（cm²·s^-1）^［27］	Ω/cm^{3 ［36］}	ψ/（°）	k/（J·K^-1）
Value	8.5×10^-11	1.667×10^-15	1.5×10^-4	1.72×10^-23	5π/6~π	1.38×10^-23

Fig.4 Scanning electron microscope and model calculation and experimental measurement of pore structure evolution of calcium-based absorber

Fig.5 ?Neck growth curve of different size calcium-based absorbents

Table 2 Sintering neck growth rate of different particle size sorbents at different time periods

Time/s

r_j·r^-1 （38~75 μm）/%

r_j·r^-1 （75~150 μm）/%

r_j·r^-1 （150~180 μm）/%

300

600

33.81

45.24

50.30

25.66

34.98

39.09

20.55

28.55

31.93

Fig.6 Model calculation results and experimental measurement results of structural evolution of sintered for 300 s pore under the control of different sintering mechanisms of calcium absorbers with different particle sizes of （A） 38~75 μm and （B） 75~150 μm

Fig.7 Model calculation results and experimental measurement results of structural evolution of sintered 600 s pore under the control of different sintering mechanisms of calcium absorbers with different particle sizes of （A） 38~75 μm and （B） 75~150 μm

Fig.8 Variation curve of pore （A） and face （B） shrinkage rate of calcium based absorbers with different particle sizes

Fig.9 Variation curve of channel body pore channel （A） and face growth rate （B） of calcium absorbent with different particle sizes

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Simulation of Aggregate Structure Evolution of Calcium-Based Absorbent Based on Sintering Mechanism

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