Low Solids Coal Water Slurry Cofiring for NOx Trim

2002 ◽  
Author(s):  
Joseph J. Battista ◽  
Evan E. Hughes
Keyword(s):  
Catalytic Reduction ◽  
Department Of Energy ◽  
Environmental Research ◽  
Coal Waste ◽  
Nox Emissions ◽  
Water Slurry ◽  
Coal Cleaning ◽  
Coal Water Slurry ◽  
Penn State ◽  
Combustion Tests

Over the past decade, members of the Upgraded Coal Interest Group and EPRI, the Department of Energy, the Energy and Environmental Research Corporation (GE-EER), Washington Energy Processing (WEP), Penn State University and the previous owners and operators of Seward Station located in western Pennsylvania, conducted a series of formulation and combustion tests using coal waste fines as a low solids coal water slurry cofiring fuel for electric power generation. The fine coal was recovered from coal fines impoundments and fresh coal cleaning plant fines that were cleaned, thickened and then cofired with pulverized coal in utility scale boilers. This paper explains the need for a program to eliminate these impoundments and describes the results of some of the tests conducted on the technology that demonstrate the effectiveness of trimming NOx emissions by the use of slurry cofiring. This method of trimming NOx emission has been shown to have the capability of reducing NOx emissions by 20% to 35% below the levels achieved by some low NOx burners and selective non-catalytic reduction systems (SNCRs).

scholarly journals Properties of Ultra-Clean Coal-Water Slurry Fuels for Direct-Fired Gas Turbines

1984 ◽  
Author(s):  
F. J. Smit ◽  
K. R. Anast ◽  
A. K. Bhasin
Keyword(s):  
Gas Turbines ◽  
Bituminous Coal ◽  
Department Of Energy ◽  
Energy Technology ◽  
Clean Coal ◽  
Eastern Kentucky ◽  
Water Slurry ◽  
Coal Cleaning ◽  
Coal Water Slurry ◽  
Cleaning Technology

Under contract DE-AC21-83MC20700 from the Morgantown Energy Technology Center (METC), AMAX Extractive R&D prepared two 250-gallon lots of clean and ultra-clean coal-water slurry fuel for use in a U.S. Department of Energy program to develop coal-fueled direct-fired gas turbines for power generation. Both lots were prepared from Eastern Kentucky high volatile bituminous coal ground to pass 44 micrometers. The first lot, containing 1.95 percent ash, was prepared from coal cleaned by standard industry physical separations. Advanced chemical coal cleaning technology was used during preparation of the second lot which contained 0.40 percent ash. The grinding and cleaning operations and the rheology, composition and other properties of the two slurry fuels are described.

Coal-Water Slurry Testing of an Industrial Gas Turbine

1992 ◽  
Author(s):  
R. A. Wenglarz ◽  
C. Wilkes ◽  
R. C. Bourke ◽  
H. C. Mongia
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Water Injection ◽  
Department Of Energy ◽  
Combustion System ◽  
Hot Gas ◽  
Water Slurry ◽  
Coal Water Slurry ◽  
Burning Coal ◽  
Industrial Gas Turbine

This paper describes the first test of an industrial gas turbine and low emissions combustion system on coal-water-slurry fuel. The engine and combustion system have been developed over the past five years as part of the Heat Engines program sponsored by the Morgantown Energy Technology Center of the U.S. Department of Energy (DOE). The engine is a modified Allison 501-K industrial gas turbine designed to produce 3.5 MW of electrical power when burning natural gas or distillate fuel. Full load power output increases to approximately 4.9 MW when burning coal-water slurry as a result of additional turbine mass flow rate. The engine has been modified to accept an external staged combustion system developed specifically for burning coal and low quality ash-bearing fuels. Combustion staging permits the control of NOx from fuel-bound nitrogen while simultaneously controlling CO emissions. Water injection freezes molten ash in the quench zone located between the rich and lean zones. The dry ash is removed from the hot gas stream by two parallel cyclone separators. This paper describes the engine and combustor system modifications required for running on coal and presents the emissions and turbine performance data from the coal-water slurry testing. Included is a discussion of hot gas path ash deposition and planned future work that will support the commercialization of coal-fired gas turbines.

Operating Results of the Cooper-Bessemer JS-1 Engine on Coal–Water Slurry

1988 ◽  
Vol 110 (3) ◽  
pp. 431-436 ◽  
Author(s):  
A. K. Rao ◽  
C. H. Melcher ◽  
R. P. Wilson ◽  
E. N. Balles ◽  
F. S. Schaub ◽  
...  
Keyword(s):  
Air Temperature ◽  
Engine Performance ◽  
Nox Emissions ◽  
Hole Size ◽  
Successful Operation ◽  
Water Slurry ◽  
Injector Nozzle ◽  
Coal Water Slurry ◽  
Pilot Fuel ◽  
Nozzle Hole

Successful operation of the Cooper-Bessemer JS-1 engine on coal–water slurry (CWS) fuel has been achieved at full power output, part load, and part speed conditions with varying degrees of diesel pilot fuel including zero pilot (auto-ignition of CWS). Selected results of the effect of pilot fuel quantity, pilot fuel timing, and manifold air temperature on engine performance are presented. Also, the influence of injector nozzle hole size and CWS mean particle size on engine performance is studied. High injection pressures resulted in good atomization of CWS and in combination with heated combustion air resulted in short ignition delays and very acceptable fuel consumption. Low CO/CO2 ratios in exhaust gas analysis confirmed good combustion efficiency. NOx emissions are compared for CWS and diesel fuel operation of the engine. Effect of injector nozzle hole size and manifold air temperature on NOx emissions is studied.

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