Study on Thermal Characteristics of a High Temperature Air Combustion Boiler (2nd Report, Numerical Study)

Hiromichi Kobayashi, Kunio Yoshikawa

Research output: Contribution to journalArticle

Abstract

Thermal characteristics of a high temperature air combustion boiler is numerically examined. The high temperature air combustion is realized using a preheated air of about 800°C∼1000°C under low oxygen content (∼5%). Numerical simulation reveals that more uniform temperature distribution in the boiler and higher heat transfer are obtainable using high temperature air in comparison with using normal temperature air owing to mild reactions in the high temperature field and heat recovery by regenerative burners. High speed injection of high temperature air into the boiler causes in-furnace exhaust gas recirculation, which results in low NOx emission. There is good agreement between experiment and numerical simulation in particular when using low calorific value gas, because more uniform temperature distribution is realized and average temperature in the boiler becomes lower.

Original languageEnglish
Pages (from-to)2330-2336
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume69
Issue number686
Publication statusPublished - 2003 Oct

Fingerprint

high temperature air
boilers
Boilers
temperature distribution
Air
Temperature distribution
Temperature
exhaust gases
air
burners
furnaces
Exhaust gas recirculation
Calorific value
simulation
heat transfer
recovery
Computer simulation
high speed
Waste heat utilization
injection

Keywords

  • Boiler
  • Computational Fluid Dynamics
  • Diffusion Combustion
  • Heat Transfer
  • High Temperature Air Combustion
  • Waste Heat Recovery

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "Thermal characteristics of a high temperature air combustion boiler is numerically examined. The high temperature air combustion is realized using a preheated air of about 800°C∼1000°C under low oxygen content (∼5{\%}). Numerical simulation reveals that more uniform temperature distribution in the boiler and higher heat transfer are obtainable using high temperature air in comparison with using normal temperature air owing to mild reactions in the high temperature field and heat recovery by regenerative burners. High speed injection of high temperature air into the boiler causes in-furnace exhaust gas recirculation, which results in low NOx emission. There is good agreement between experiment and numerical simulation in particular when using low calorific value gas, because more uniform temperature distribution is realized and average temperature in the boiler becomes lower.",
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N2 - Thermal characteristics of a high temperature air combustion boiler is numerically examined. The high temperature air combustion is realized using a preheated air of about 800°C∼1000°C under low oxygen content (∼5%). Numerical simulation reveals that more uniform temperature distribution in the boiler and higher heat transfer are obtainable using high temperature air in comparison with using normal temperature air owing to mild reactions in the high temperature field and heat recovery by regenerative burners. High speed injection of high temperature air into the boiler causes in-furnace exhaust gas recirculation, which results in low NOx emission. There is good agreement between experiment and numerical simulation in particular when using low calorific value gas, because more uniform temperature distribution is realized and average temperature in the boiler becomes lower.

AB - Thermal characteristics of a high temperature air combustion boiler is numerically examined. The high temperature air combustion is realized using a preheated air of about 800°C∼1000°C under low oxygen content (∼5%). Numerical simulation reveals that more uniform temperature distribution in the boiler and higher heat transfer are obtainable using high temperature air in comparison with using normal temperature air owing to mild reactions in the high temperature field and heat recovery by regenerative burners. High speed injection of high temperature air into the boiler causes in-furnace exhaust gas recirculation, which results in low NOx emission. There is good agreement between experiment and numerical simulation in particular when using low calorific value gas, because more uniform temperature distribution is realized and average temperature in the boiler becomes lower.

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KW - Computational Fluid Dynamics

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KW - Heat Transfer

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KW - Waste Heat Recovery

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