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Title: Furnace and Heat Recovery Area Design and Analysis for Conceptual Design of Oxygen-Based PC Boiler

Abstract

The objective of the furnace and heat recovery area design and analysis task of the Conceptual Design of Oxygen-Based PC Boiler study is to optimize the location and design of the furnace, burners, over-fire gas ports, and internal radiant surfaces. The furnace and heat recovery area were designed and analyzed using the FW-FIRE and HEATEX computer programs. The furnace is designed with opposed wall-firing burners and over-fire air ports. Water is circulated in the furnace by natural circulation to the waterwalls and divisional wall panels. Compared to the air-fired furnace, the oxygen-fired furnace requires only 65% of the surface area and 45% of the volume. Two oxygen-fired designs were simulated: (1) without over-fire air and (2) with 20% over-fire air. The maximum wall heat flux in the oxygen-fired furnace is more than double that of the air-fired furnace due to the higher flame temperature and higher H{sub 2}O and CO{sub 2} concentrations. The coal burnout for the oxygen-fired case is 100% due to a 500 F higher furnace temperature and higher concentration of O{sub 2}. Because of the higher furnace wall temperature of the oxygen-fired case compared to the air-fired case, furnace water wall material was upgraded from carbon steelmore » to T91. The total heat transfer surface required in the oxygen-fired heat recovery area (HRA) is 25% less than the air-fired HRA due to more heat being absorbed in the oxygen-fired furnace and the greater molecular weight of the oxygen-fired flue gas. The HRA tube materials and wall thickness are practically the same for the air-fired and oxygen-fired design since the flue gas and water/steam temperature profiles encountered by the heat transfer banks are very similar.« less

Authors:
Publication Date:
Research Org.:
Foster Wheeler Power Group, Inc.
Sponsoring Org.:
USDOE
OSTI Identifier:
861885
DOE Contract Number:  
FC26-03NT41736
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 36 MATERIALS SCIENCE; BOILERS; BURNERS; BURNOUT; CARBON STEELS; COAL; COMBUSTION PROPERTIES; COMPUTER CODES; FLUE GAS; FURNACES; HEAT FLUX; HEAT RECOVERY; HEAT TRANSFER; MOLECULAR WEIGHT; NATURAL CONVECTION; SURFACE AREA; THICKNESS; WATER; WATER WALLS

Citation Formats

Seltzer, Andrew. Furnace and Heat Recovery Area Design and Analysis for Conceptual Design of Oxygen-Based PC Boiler. United States: N. p., 2005. Web. doi:10.2172/861885.
Seltzer, Andrew. Furnace and Heat Recovery Area Design and Analysis for Conceptual Design of Oxygen-Based PC Boiler. United States. https://doi.org/10.2172/861885
Seltzer, Andrew. 2005. "Furnace and Heat Recovery Area Design and Analysis for Conceptual Design of Oxygen-Based PC Boiler". United States. https://doi.org/10.2172/861885. https://www.osti.gov/servlets/purl/861885.
@article{osti_861885,
title = {Furnace and Heat Recovery Area Design and Analysis for Conceptual Design of Oxygen-Based PC Boiler},
author = {Seltzer, Andrew},
abstractNote = {The objective of the furnace and heat recovery area design and analysis task of the Conceptual Design of Oxygen-Based PC Boiler study is to optimize the location and design of the furnace, burners, over-fire gas ports, and internal radiant surfaces. The furnace and heat recovery area were designed and analyzed using the FW-FIRE and HEATEX computer programs. The furnace is designed with opposed wall-firing burners and over-fire air ports. Water is circulated in the furnace by natural circulation to the waterwalls and divisional wall panels. Compared to the air-fired furnace, the oxygen-fired furnace requires only 65% of the surface area and 45% of the volume. Two oxygen-fired designs were simulated: (1) without over-fire air and (2) with 20% over-fire air. The maximum wall heat flux in the oxygen-fired furnace is more than double that of the air-fired furnace due to the higher flame temperature and higher H{sub 2}O and CO{sub 2} concentrations. The coal burnout for the oxygen-fired case is 100% due to a 500 F higher furnace temperature and higher concentration of O{sub 2}. Because of the higher furnace wall temperature of the oxygen-fired case compared to the air-fired case, furnace water wall material was upgraded from carbon steel to T91. The total heat transfer surface required in the oxygen-fired heat recovery area (HRA) is 25% less than the air-fired HRA due to more heat being absorbed in the oxygen-fired furnace and the greater molecular weight of the oxygen-fired flue gas. The HRA tube materials and wall thickness are practically the same for the air-fired and oxygen-fired design since the flue gas and water/steam temperature profiles encountered by the heat transfer banks are very similar.},
doi = {10.2172/861885},
url = {https://www.osti.gov/biblio/861885}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2005},
month = {Sat Jan 01 00:00:00 EST 2005}
}