[1] Shao Yali, Wang Xudong, Jin Baosheng, et al. Numerical simulation of solid circulation mechanismand gas flow paths in a chemical looping combustion system [J]. Journal of Southeast University (English Edition), 2021, 37 (3): 272-275. [doi:10.3969/j.issn.1003-7985.2021.03.006]

Copy

Numerical simulation of solid circulation mechanismand gas flow paths in a chemical looping combustion system()

化学链燃烧系统中颗粒循环规律及气体流动路径数值模拟

Share：

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

37

Issue:

2021 3

Page:

272-275

Research Field:

Energy and Power Engineering

Publishing date:

2021-09-20

Info

Title:

Numerical simulation of solid circulation mechanismand gas flow paths in a chemical looping combustion system

化学链燃烧系统中颗粒循环规律及气体流动路径数值模拟

Author(s):

Shao Yali¹;  2;  Wang Xudong²;  Jin Baosheng²

¹School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210023, China
²School of Energy and Environment, Southeast University, Nanjing 210096, China

邵亚丽¹;  2;  王旭东²;  金保昇²

¹南京师范大学能源与机械工程学院, 南京 210023; ²东南大学能源与环境学院, 南京 210096

Keywords:

chemical looping combustion;  two-stage air reactor;  solid circulation;  gas leakage

化学链燃烧;  二级空气反应器;  颗粒循环;  窜气

PACS:

TK16

DOI:

10.3969/j.issn.1003-7985.2021.03.006

Abstract:

To study the gas-solid flow characteristics in a chemical looping combustion system integrated with a moving bed air reactor, a 3D full-loop numerical model was established using the Eulerian-Eulerian approach integrated with the kinetic theory of granular flow. The solid circulation mechanism and gas leakage performance were studied in detail. The simulation results showed that in the start-up process, the solid circulation rate first increased to approximately 5 kg/s and then dropped to approximately 1.2 kg/s; this observation was related to the dynamic control of the pressure distribution. In this system, the gas leakage between the inertial separator, upper air reactor, and lower air reactor was restrained by adjusting the pressure difference, thus obtaining optimal gas flow paths. When the pressures at the outlets of the inertial separator, upper air reactor, and lower air were 7.4, 11.0, and 14.6 kPa, respectively, the gas leakage ratio was less than 1% in the system.

为分析基于移动床空气反应器的化学链燃烧系统中的气固流动特性, 采用耦合颗粒动理学理论的欧拉-欧拉法对系统建立了三维全尺度的数值模型, 并对颗粒循环机理和窜气特性进行了模拟研究.结果表明, 在启动阶段, 固体循环率先增大至约5 kg/s, 随后下降至1.2 kg/s左右, 这与压力分布的动态调控相关.在该系统中, 通过调节压差可充分抑制惯性分离器、上部空气反应器和下部空气反应器之间的窜气, 从而获得最佳的气体流动路径.当惯性分离器出口、上部空气反应器出口和下部空气反应器出口的压力分别为7.4、11.0 和 14.6 kPa时, 系统内的窜气率均小于1%.

References:

[1] Wang X D, Shao Y L, Jin B S. Spatiotemporal statistical characteristics of multiphase flow behaviors in fuel reactor for separated-gasification chemical looping combustion of solid fuel[J]. Chemical Engineering Journal, 2021, 412: 128575. DOI: 10.1016/j.cej.2021.128575.
[2] Francisco J V, Carmen R F, I�F1;aki A, et al. Assessment of low-cost oxygen carrier in South-western Colombia, and its use in the in-situ gasification chemical looping combustion technology[J]. Fuel, 2018, 218: 417-424. DOI: 10.1016/j.fuel.2017.11.078.
[3] Li S Y, Shen Y S. Numerical study of gas-solid flow behaviors in the air reactor of coal-direct chemical looping combustion with Geldart D particles[J]. Powder Technology, 2020, 361: 74-86. DOI: 10.1016/j.powtec.2019.10.045.
[4] Shao Y L, Zhang Y, Wang X J, et al. Three-dimensional full loop modeling and optimization of an in situ gasification chemical looping combustion system[J]. Energy and Fuels, 2017, 31(12): 13859-13870. DOI: 10.1021/acs.energyfuels.7b02119.
[5] Zhou L, Han C, Bai L, et al. Numerical and experimental study of multiphase transient core-annular flow patterns in a spouted bed[J]. Journal of Energy Resources Technology, 2020, 142(9): 1-13. DOI: 10.1115/1.4047305.
[6] Hamidouche Z, Masi E, Fede P, et al. Unsteady three-dimensional theoretical model and numerical simulation of a 120 kW chemical looping combustion pilot plant. Chemical Engineering Science, 2019, 193: 102-119. DOI: 10.1016/j.ces.2018.08.032.
[7] Banerjee S, Ramesh K A. Computational fluid dynamics simulations of a binary particle bed in a riser-based carbon stripper for chemical looping combustion[J]. Powder Technology. 2018, 325: 361-367. DOI: 10.1016/j.powtec.2017.11.032.
[8] Mahalatkar K, Kuhlman J, Huckaby E D, et al. CFD simulation of a chemical-looping fuel reactor utilizing solid fuel[J]. Chemical Engineering Science, 2011, 66(16): 3617-3627. DOI: 10.1016/j.ces.2011.04.025.
[9] Yin W J, Wang S, Zhang K. Numerical investigation of in situ gasification chemical looping combustion of biomass in a fluidized bed reactor[J].Renewable Energy, 2020, 151: 216-225. DOI: 10.1016/j.renene.2019.11.016.
[10] Ding J M, Gidaspow D. A bubbling fluidization model using kinetic theory of granular flow[J]. AIChE Journal, 1990, 36(4): 523-538. DOI: 10.1002/aic.690360404.
[11] Menon G K, Patnaikuni V S. CFD simulation of fuel reactor for chemical looping combustion of Indian coal[J]. Fuel, 2017, 203: 90-101. DOI: 10.1016/j.fuel.2017.04.084.

Memo

Memo:

Biographies: Shao Yali(1993—), female, Ph.D. candidate, lecturer; Jin Baosheng(corresponding author), male, professor, bsjin@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No. 51976034), China Postdoctoral Science Foundation(No. 2020M681455), the National Key R&D Program of China(No. 2018YFC1901200), Jiangsu Planned Projects for Postdoctoral Research Funds, the Fundamental Research Funds for the Central Universities.
Citation: Shao Yali, Wang Xudong, Jin Baosheng.Numerical simulation of solid circulation mechanism and gas flow paths in a chemical looping combustion system[J].Journal of Southeast University(English Edition), 2021, 37(3):272-275.DOI:10.3969/j.issn.1003-7985.2021.03.006.

Common functions