rectification notice of excessive oxygen content of coal-fired boilers

Why Oxygen Levels Matter in High Efficiency Boilers

Jun 15, 1994 · Unit One is a pulverized coal-fired, dry bottom boiler with an opposed firing configuration. Low NOx burners are used to control NOx emissions. Normal operating temperature in the combustion zone is approximately 2,000 - 3,000 degF. The boiler produces 4,500,000 lb/hr of steam for a General Electric steam turbine generator rated at 688 MWe.

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Combustion Efficiency and Excess Air

Nitrogen content = 1.40 Oxygen content = 6.05 GCV of Coal = 3401 kCal/kg Step 1. Find theoretical air requirement Theoretical air required for complete combustion = [(11.6 X C) + {34.8 X ( X /8)} + (4.35 X S)] /100 kg/kg of coal = 4.74 kg/kg of coal Step 2. Find theoretical % at theoretical conditions = moles= +

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Boiler-Tuning Basics, Part I - POWER Magazine

Oct 10, 2017 · There is a diminishing returns effect in oxygen content and performance for the unit. Too much available oxygen will lead to inefficient combustion. Over time, the unit will require unscheduled maintenance. Too little available oxygen causes unstable combustion and increased emissions. This will lead to flame loss faults and, once again, unscheduled maintenance.

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Guidelines for NOx Control by Combustion Modification for

Boiler-Tuning Basics, Part I - POWER Magazine

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Oxygen Control | CleanBoiler.org

Results of Boiler Tuning and Optimization • Improved excess oxygen, CO, NO X and FEGT balance 5 10 15 20 25 30 35 40 45 50 55 5 10 15 20 25 30 35 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 5 10 15 20 25 30 35 40 45 50 55 5 10 15 20 25 30 35 1500 17505 10 200015 202250 25 250030 35 40 45

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Energy Audit of Coal Fired Thermal Power Plant

Typically, excess air levels on coal-fired utility boilers vary from 18 to 25 percent (3.5 to 5% Q£ in the flue gas). Only recently has it been found possible to reduce oxygen levels on pulverized coal-fired boilers down to 1 to 2 percent to minimize NOX emissions (and possibly increase efficiency) in short term tests.

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Guidelines for Industrial Boiler Performance Improvement

Oxygen Control | CleanBoiler.org

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Oxygen attack in boilers - Lenntech

Coal fired boilers had the highest NO emission levels and X the NO was generally found to be more sensitive to changes in X excess oxygen than the average oil or gas fired units. The fuel nitrogen content of coal is the major factor in these higher emissions.

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Coal Fired Boiler Optimization and the Impact on Emission

Boiler-Tuning Basics, Part I - POWER Magazine

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