Modeling of the Chemical Looping Combustion of Hard Coal and Biomass Using Ilmenite as the Oxygen Carrier

Anna Zylka,Tomasz Czakiert,Wojciech Nowak,Marcio L De Souza-Santos,Kamil Idziak,Jaroslaw Krzywanski,Marcin Sosnowski,Karol Sztekler

doi:10.3390/en13205394

Abstract

This paper presents a 1.5D model of a fluidized bed chemical looping combustion (CLC) built with the use of a comprehensive simulator of fluidized and moving bed equipment (CeSFaMB) simulator. The model is capable of calculating the effect of gas velocity in the fuel reactor on the hydrodynamics of the fluidized bed and the kinetics of the CLC process. Mass of solids in re actors, solid circulating rates, particle residence time, and the number of particle cycles in the air and fuel reactor are considered within the study. Moreover, the presented model calculates essential emissions such as CO2, SOX, NOX, and O2. The model was successfully validated on experimental tests that were carried out on the Fluidized-Bed Chemical-Looping-Combustion of Solid-Fuels unit located at the Institute of Advanced Energy Technologies, Czestochowa University of Technology, Poland. The model’s validation showed that the maximum relative errors between simulations and experiment results do not exceed 10%. The CeSFaMB model is an optimum compromise among simulation accuracy, computational resources, and processing time.

Highlights

Global climate change caused by the greenhouse effect is the main reason to look for new solutions for burning solid fuels
The first attempts to validate the chemical looping combustion (CLC) model for ilmenite using the CeSFaMB simulator were presented in other studies [3,27]
This paper shows numerical simulations with the latest version of the CeSFaMB 4th generation for biomass and coal CLC combustion with ilmenite oxygen carrier

Summary

Introduction

Global climate change caused by the greenhouse effect is the main reason to look for new solutions for burning solid fuels. One of the most promising combustion methods with inherent CO2 separation is chemical looping combustion (CLC) technology, which uses oxygen carriers (OCs) in the fuel combustion process. This technology requires two separate fluidized bed reactors: air reactor (AR). Fuel reactor (FR) with circulating and bubbling fluidized bed, respectively. The OCs are reduced in the FR’s reaction chamber, as shown in Figure 1 [1,2].

Methods

Results

Conclusion