Abstract
AbstractThis study explores the use of a dual interconnected circulating fluidized bed (CFB) for chemical looping combustion. This design can enhance gas–solid interactions, but it is difficult to control the solid transfer and circulation rates. With the use of a 1:1 scale cold‐flow model, an investigation determining the hydrodynamic behavior of the dual CFB system has been conducted. The cold‐flow system consists of two identical fast‐bed risers, each with an internal diameter of 100 mm and a height of 7 m. The simplified cold‐flow model is based on the chemical looping Pilot‐Scale Advanced CO2 Capture Technology (PACT) facility at Cranfield. Here, we have determined the minimum fluidization and transport velocities, and we have assessed the solid density profiles, transport capacity, and potential for the dilution by air/N2 leakage into the CO2 stream exiting the fuel reactor. The experimental procedure uses two different bed materials, molochite (ceramic clay) and FE100 (iron particles), and it satisfies the dynamic scaling laws to model the bed inventory within the system. The results indicate that the two fast‐bed risers share similar density and pressure profiles. Stable circulation can be achieved through pneumatic transport. The circulation rate of the system is flexible and can be adjusted by altering the fluidization velocity in the riser and by altering the bed inventory. The gas leakage from the loop seal to the cyclone was found to be sensitive to the bed height and fluidization velocity in the loop seal. However, by maintaining a loop‐seal bed height above 600 mm during operation, the outlet stream remains undiluted.
Highlights
As a result of the industrial maturity of circulating fluidizedbed (CFB) reactors, the technology is widely deployed
The pressure curves for the molochite and the FE100 particles are shown in Figure 4 and Figure 5, respectively
The investigation provides acceptable indicators for gas leakage control for transfer to the dual fast-bed system. This investigation centers on the design philosophy of a 1:1 scale cold-flow model (CFM) for a dual interconnected circulating fluidized-bed system for the chemical looping combustion of gaseous fuels
Summary
As a result of the industrial maturity of circulating fluidizedbed (CFB) reactors, the technology is widely deployed. In the power generation sector, the use of CFB boilers is common, due to their ability to utilize low-grade, lowcalorific-value fuels, and maintain the capability for flexible operation.[1] This flexibility lends itself well to other technologies, including high-temperature looping cycles for fossil fuel conversion and carbon capture systems.[2] A high-temperature solid looping process known as chemical looping combustion (CLC) is the focus of this work. Such high-temperature looping systems must first be demonstrated at smaller scales using pilot-scale systems. It is necessary to use a cold-flow system that can accurately determine the fluid-dynamic properties presented by the fluidized particles and a given reactor configuration, while conducting tests at ambient conditions
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