Condensing economizers for thermal efficiency improvements and emissions control

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

OSTI ID:10161394

Heaphy, J P; Carbonara, J ^[1]; Litzke, W; Butcher, T A ^[2]

---

1. Consolidated Edison Co. of New York, Inc., New York, NY (United States)
2. Brookhaven National Lab., Upton, NY (United States)

Flue gas condensing economizers improve the thermal efficiency of boilers by recovering sensible heat and water vapor latent heat from flue gas exhaust. In addition to improving thermal efficiency, condensing economizers also have the potential to act as control devices for emissions of particulates, SO{sub x}, and air toxics. Both Consolidated Edison of New York and Brookhaven National LaborAtory are currently working on condensing economizer technology with an emphasis on developing their potential for emissions control. Con Edison is currently conducting a condensing economizer demonstration at their oil-fired 74th Street Station in New York. Since installing this equipment in February of 1992 a heat rate improvement of 800 Btu/kWh has been seen. At another location, Ravenswood Station, a two stage condensing economizer has been installed in a pilot test. In this advanced configuration -the ``Integrated Flue Gas Treatment or IFGT system- two heat exchanger sections are installed and sprays of water with and without SO{sub 2} sorbents are included. Detailed studies of the removal of particulates, SO{sub 2}, SO{sub 3}, and selected air toxics have been done for a variety of operating conditions. Removal efficiencies for SO{sub 2} have been over 98% and for SO{sub 3} over 65%. Brookhaven National Laboratory`s studies involve predicting and enhancing particulate capture in condensing economizers with an emphasis on small, coal-fired applications. This work is funded by the Pittsburgh Energy Technology Center of the Department of Energy. Flyash capture efficiencies as high as 97% have been achieved to date with a single stage economizer.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 10161394
• Report Number(s): BNL--60478; CONF-9309111--7; ON: DE94014080
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000
02 PETROLEUM
025000
20 FOSSIL-FUELED POWER PLANTS
200202
AIR POLLUTION CONTROL
BOILERS
COAL
COMBUSTION
COOLING
ECONOMIZERS
FLUE GAS
FOSSIL-FUEL POWER PLANTS
FUEL OILS
HEAT RATE
NOXIOUS GAS AND PARTICULATE EMISSIONS
PARTICULATES
REMOVAL
SULFUR DIOXIDE
SULFUR TRIOXIDE
THERMAL EFFICIENCY
VAPOR CONDENSATION