Modeling and Simulation of Chemical Looping Combustion Using a Copper-Based Oxygen Carrier in a Double-Loop Circulating Fluidized Bed Reactor System

Abstract

In this work, a CFD simulator has been developed for a novel double loop circulating fluidized bed (DLCFB) reactor which is used for chemical looping combustion process. The simulator is implemented in an in-house code including the kinetic theory of granular flow and reaction models. Methane is used as fuel and copper oxide based particles used as oxygen carrier. The process is configured with an air reactor and a fuel reactor. The two reactors are modelled and solved by a sequential approach. The connection between the two reactors is realized through time-dependent inlet and outlet boundary conditions. The model is validated with the experimental data obtained in the current work. At a thermal input of 100 kW the methane conversion of 98 % was achieved. For the cases studied in this work, temperature is the most important factor 1 for the reactor performance, followed by the gas velocity and methane concentration of fuel. The increase of the methane concentration could decrease the methane conversion which is due to the decrease of specific inventory. As the gas velocity is increased, the residence time and the degree of gas-solid contact decreases, causing a decrease in reactor performance. Besides the effect of the single factor, the combination effect of the gas velocity and methane concentration is also important to the reactor performance.

Numerical Investigation of Nickel–Copper Oxygen Carriers in Chemical-Looping Combustion Process with Zero Emission of CO and H2

“…Kuo et al presented the validation, optimization, and efficiency of the iron-based oxygen carriers in the CLC system with a one-dimensional simulation. Zhang et al simulated two reactors with copper-based oxygen carriers in a dual-circulating fluidized bed by a sequential approach, and it proved that temperature can significantly affect the reactor performance. Furthermore, the zero emission of H 2 and CO was found at the outlet of FR, while methane was introduced as fuel from the inlet.…”

Study of NH3 Removal Based on Chemical-Looping Combustion

“…There are two separate reactions in chemical-looping combustion (CLC). , In the reduction reactions between oxidative oxygen carriers (OCs) and hydrocarbon fuels, oxidative OCs are reduced to reductive OCs and hydrocarbon fuels are oxidized to H 2 O and CO 2 . In the oxidation reactions between the reductive OCs and air, the reductive OCs are regenerated to the oxidative OCs with O 2 .…”