Effects of (Co-)Combustion Techniques and Operating Conditions on the Performance and NO Emission Reduction in a Biomass
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ORIGINAL PAPER
Effects of (Co‑)Combustion Techniques and Operating Conditions on the Performance and NO Emission Reduction in a Biomass‑Fueled Twin‑Cyclone Fluidized‑Bed Combustor Pichet Ninduangdee1 · Porametr Arromdee2 · Chhaina Se3 · Vladimir I. Kuprianov3 Received: 17 October 2019 / Accepted: 13 June 2020 © Springer Nature B.V. 2020
Abstract This work studied the potential of using two (co-)combustion techniques to reduce NO emission in a novel twin-cyclone combustor with a swirling fluidized bed. Prior to a (co-)combustion study, cold-state hydrodynamic tests were performed to investigate the flow regimes and hydrodynamic characteristics of a silica sand bed employed in this reactor. Static bed height of 20 cm was found suitable to ensure bubbling fluidization of the swirling bed during (co-)firing experiments. In the (co-)combustion study, rice husk (a base fuel) was first co-fired with high-moisture sugarcane bagasse (sharing 15% of the total heat input) using an air staging technique, whereas in the second group of experiments, the base fuel was combusted alone with flue gas recirculation. Detailed investigations of (co-)combustion and emission characteristics of the two proposed techniques was performed with a 100 kW heat input to the combustor for variable operating parameters: 30–60% excess air, 0–0.3 secondary-to-total air ratio in the tests for air staging, and 5– 20% fraction of the recycling flue gas when using the second technique. In all test runs, both (co-)combustion techniques ensured NO reducing conditions in the lower combustor’s chamber, leading eventually to the NO emission reduction, compared to burning the base fuel alone. At optimal operating parameters, the combustor showed high (~ 99%) combustion efficiency and reduction of NO emission: by 30% for husk-bagasse co-firing with air staging, and by 38% when burning rice husk with flue gas recirculation, as compared to conventional combustion of the base fuel.
* Pichet Ninduangdee [email protected]; [email protected] 1
Division of Mechanical Engineering, Faculty of Engineering and Industrial Technology, Phetchaburi Rajabhat University, Phetchaburi 76000, Thailand
2
Department of Mechanical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom 73000, Thailand
3
Sirindhorn International Institute of Technology, Thammasat University, Thammasat Rangsit Post Office, P.O. Box 22, Pathum Thani 12121, Thailand
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Vol.:(0123456789)
Waste and Biomass Valorization
Graphic Abstract
Keywords Twin-cyclone combustor · Swirling fluidized bed · Biomass (co-)combustion · Air staging · Flue gas recirculation · NO emission reduction
Statement of Novelty A novel twin-cyclone fluidized-bed combustor with a compact design, ensuring high-efficiency combustion of rice husk with elevated fuel-ash content, has been proposed in this work. A highly intensive combustion process is achieved in the lower chamber of the combustor, due to the swirling fluidization regime of the gas–soli
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