Development and testing of a high efficiency advanced coal combustor: Phase 3, industrial boiler retrofit. Quarterly technical progress report number 12, July 1, 1994--September 30, 1994

Technical Report · Fri Nov 18 04:00:00 EST 1994

DOI:https://doi.org/10.2172/61098· OSTI ID:61098

Patel, R L; Borio, R ^[1]; Scaroni, A W; Miller, B G ^[2]; McGowan, J G ^[3]

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1. ABB/Combustion Engineering, Windsor, CT (United States). Power Plant Labs.
2. Pennsylvania State Univ., University Park, PA (United States)
3. Univ. of Massachusetts, Amherst, MA (United States)

The objective of this project is to retrofit the previously developed High Efficiency Advanced Coal Combustor (HEACC) to a standard gas/oil designed industrial boiler to assess the technical and economic viability of displacing premium fuels with microfine coal. During this reporting period, data reduction/evaluation and interpretation from the long term four hundred hours Proof-of-Concept System Test under Task 3 were completed. Cumulatively, a total of approximately 563 hours of coal testing was performed with 160 hrs on 100% coal and over 400 hours with co-firing coal and gas. The primary objectives of this testing were to: (1) obtain steady state operation consistently on 100% coal; (2) increase carbon conversion efficiency from 95% to the project goal of 98%; and (3) maintain NOx emissions at or below 0.6 lbs/MBtu. The following specific conclusions are based on results of coal-fired testing at Penn State and the initial economic evaluation of the HEACC system: a coal handling/preparation system can be designed to meet the technical requirements for retrofitting microfine coal combustion to a gas/oil-designed boiler; the boiler thermal performance requirements were met; the NOx emission target of was met; combustion efficiencies of 95% could be met on a daily average basis, somewhat below the target of 98%; the economic playback is very sensitive to fuel differential cost, unit size, and annual operating hours; continuous long term demonstration is needed to quantify ash effects and how to best handle ashes. The following modifications are recommended prior to the 1,000 hour demonstration phase testing: (1) coal feeding improvements--improved raw coal/storage and transport, installation of gravimetric feeder, and redesign/installation of surge bin bottom; (2) burner modification--minor modification to the tip of the existing HEACC burner to prevent change of flame shapes for no apparent reason.

• Research Organization: ABB Combustion Engineering, Inc., Windsor, CT (United States). ABB Power Plant Labs.
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC22-91PC91160
• OSTI ID: 61098
• Report Number(s): DOE/PC/91160--T4; ON: DE95011386
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
AIR POLLUTION ABATEMENT
COAL PREPARATION PLANTS
COCOMBUSTION
COMBUSTORS
DESIGN
ECONOMIC ANALYSIS
EXPERIMENTAL DATA
FUEL FEEDING SYSTEMS
FUEL SUBSTITUTION
GAS FURNACES
MATERIALS HANDLING EQUIPMENT
NATURAL GAS
NITROGEN OXIDES
OIL FURNACES
PAYBACK PERIOD
PERFORMANCE
PROGRESS REPORT
PULVERIZED FUELS
RETROFITTING
THERMAL EFFICIENCY