scholarly journals Estimation of NO{sub x} emissions from pulverized coal-fired utility boilers. Final report

1995 ◽  
Author(s):  
D.J. Wildman ◽  
S.M. Smouse
Keyword(s):  
Pulverized Coal ◽  
Final Report ◽  
Utility Boilers

Studies of sintering of coal ash relevant to pulverized coal utility boilers

Fuel ◽  
1984 ◽  
Vol 63 (12) ◽  
pp. 1664-1670 ◽  
Author(s):  
Richard E. Conn ◽  
Leonard G. Austin
Keyword(s):  
Coal Ash ◽  
Pulverized Coal ◽  
Utility Boilers

Surface Characterization of the Mechanism for Decreased Boiler Slagging via Fly Ash Surface Modification

1985 ◽  
Vol 65 ◽  
Author(s):  
Christopher J. Macey
Keyword(s):  
Fly Ash ◽  
Flue Gas ◽  
Surface Characterization ◽  
Depth Profiling ◽  
Pilot Scale ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Utility Boilers ◽  
Combustion Experiment

ABSTRACTSlagging difficulties encountered in large, pulverized coal-fired utility boilers can be alleviated by using recently developed chemical conditioners designed to inhibit the agglomeration of molten fly ash particles. Slagging results from the impaction and accretion on the boiler interior surfaces of molten ash particles in the flue gas resulting from the combustion of coal. Electron Spectroscopy for chemical Analysis (ESCA) and ion sputtering depth profiling were utilized to examine the mechanism whereby a fuel conditioner containing copper oxychloride effectively reduced slag deposition rates during a pilot-scale, pulverized coal combustion experiment.

Bench Scale Process Evaluation of Reburning for In-Furnace NOx Reduction

1986 ◽  
Vol 108 (3) ◽  
pp. 450-454 ◽  
Author(s):  
S. B. Greene ◽  
S. L. Chen ◽  
D. W. Pershing ◽  
M. P. Heap ◽  
W. R. Seeker
Keyword(s):  
Molecular Nitrogen ◽  
Nox Reduction ◽  
Plug Flow ◽  
Firing Zone ◽  
Pulverized Coal ◽  
Process Variables ◽  
Fuel Type ◽  
Bench Scale ◽  
Utility Boilers ◽  
Coal Type

Reburning involves the injection of a secondary fuel above the main firing zone of pulverized coal-fired utility boilers to produce a reducing zone which acts to reduce NOx to molecular nitrogen. Overfire air is added above the reburn reducing zone to complete the combustion. Bench scale evaluations of the process carried out in a plug flow furnace at 23 KW have indicated that NOx reductions of up to 70 percent can be achieved depending on a number of process variables. The dominant variables include the initial NOx level that is to be reduced, the reburning fuel type (pulverized coal type or natural gas), and the residence time and temperature in the reducing zone. The reburning process has been combined with the injection of calcium-based sorbents (limestone) to investigate the potential for combined NOx and SOx reduction.

Numerical prediction of unburned carbon levels in large pulverized coal utility boilers

Fuel ◽  
2005 ◽  
Vol 84 (18) ◽  
pp. 2364-2371 ◽  
Author(s):  
Javier Pallarés ◽  
Inmaculada Arauzo ◽  
Luis Ignacio Díez
Keyword(s):  
Numerical Prediction ◽  
Pulverized Coal ◽  
Unburned Carbon ◽  
Utility Boilers

Study on Velocity Variation of Primary Air in Power Plants

2013 ◽  
Vol 341-342 ◽  
pp. 1342-1345
Author(s):  
Xing Sen Yang ◽  
Jing Yin
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Process Model ◽  
Power Plants ◽  
Pulverized Coal ◽  
Velocity Variation ◽  
Velocity Difference ◽  
Length Difference ◽  
Utility Boilers

Uniform velocity of primary air is very important in the operation of utility boilers. Regulation of the resistance of each pipe was done without pulverized coal to achieve equal flow velocity. The mass flow rate of pulverized coal and the length difference of pipes would lead to velocity variation of primary air. By the research of primary air flow and the regulation process, model of the velocity variation was built to calculate the velocity of each pipe and their difference. The arrangement of pipes and the operation parameters were taken into consideration. With the experimental data, calculation of velocity under different states was made. The velocity difference of different pipes was estimated. The length difference between pipes and the variation of the mass flow rate of pulverized coal play the most important role that affects the velocity of primary air.

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