Testing of an air cooled slagging combustor for coal fired boilers and combined cycle plants

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:45077

Zauderer, B; Fleming, E S; Borck, B ^[1]

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1. Coal Tech Corp., Merion Station, PA (United States)

This paper describes recent results of a five year development effort on a 20 MMBtu/hr slagging, coal combustor that was retrofitted to an oil designed package boiler. In addition to the efficiency benefits of regenerative air cooling, this combustor internally controls SO2 and NOx emissions. Injection of calcium based sorbents into the combustor with coal firing have yielded in recent tests SO2 reductions, as measured at the boiler outlet, in the range of 85%. Under these same conditions, i.e. with staged combustion and with high combustion efficiency, the NOx emissions were reduced by about two-thirds to less than 200 ppm. Tests were also performed in the dioxin reductions were measured in the stack. To date, the combustor has operated for about 1400 hours, with about one-third of the time on coal and the balance of oil and gas. Shorter duration test were also conducted with refuse derived fuel, and heavy oil. A number of 90 to 100 hours of continuous tests have been performed with daytime operation of coal and overnight operation at low gas fired heat input. Current test efforts are focused on automatic computer control of the combustor and durability tests with plans for continuous coal fired operation at full load for up 100 hour periods. In addition, performance, plant layout, and cost analyses have been performed on a 20 MW industrial combined gas turbine-steam turbine power plant using coal fired air cooled cyclone combustor. The plant efficiencies are in the 30% range, and the capital costs in the $1200 to $1400 range. This is significantly lower in cost than alternate coal technologies at similar plant sizes.

• OSTI ID: 45077
• Report Number(s): CONF-930413--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
AIR POLLUTION CONTROL
BOILERS
CAPITALIZED COST
COAL
COMBINED-CYCLE POWER PLANTS
COMBUSTION
CYCLONE COMBUSTORS
GAS TURBINES
NITROGEN OXIDES
PERFORMANCE TESTING
RETROFITTING
SULFUR DIOXIDE
THERMAL EFFICIENCY