Enhancing the use of coals by gas reburning-sorbent injection
Clean Coal Technology implies the use of coal in an environmentally acceptable manner. Coal combustion results in the emission of two types of acid rain precursors: oxides of sulfur (sox) and oxides of nitrogen (NO[sub x]). This Clean Coal Technology project will demonstrate a combination of two developed technologies to reduce both NO[sub x] and SO[sub x] emissions. Gas reburning and calcium based dry sorbent injection. The demonstrations will be conducted on two pre-NSPS utility boilers representative of the US boilers which contribute significantly to the inventory of acid rain precursor emissions. Gas reburning is a combustion modification technique that consists of firing 80--85 percent of the fuel (corresponding to the total heat release) in the lower furnace. Reduction of NO[sub x] to molecular nitrogen (N[sub 2]) is accomplished via the downstream injection of the remaining fuel requirement in the form of natural gas (which also reduces the total SO[sub x] emissions). In a third stage, burnout air is injected at lower temperatures in the upper furnace to complete the combustion process without generating significant additional NO[sub x]. Dry sorbent injection consists of injecting calcium based sorbents (such as limestone, dolomite, or hydrated lime) into the combustion products. For sulfation of the sorbent to CaSO[sub 4], an injection temperature of about 1230[degrees]C is optimum, but calcium-sulfur reactions can also take place at lower temperatures. Thus, the sorbent may be injected at different locations, such as with the burnout air, at the exit from the superheater, or into the ducting downstream of the air heater with H[sub 2]O added for humidification. The specific goal of this project is to demonstrate NO[sub x] and SO[sub x] emission reductions of 60 percent and 50 percent, respectively, on two coal fired utility boilers having the design characteristics mentioned above.
- Research Organization:
- Energy and Environmental Research Corp., Irvine, CA (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC22-87PC79796
- OSTI ID:
- 6935667
- Report Number(s):
- DOE/PC/79796-T28; ON: DE92041299
- Country of Publication:
- United States
- Language:
- English
Similar Records
Enhancing the use of coals by gas reburning-sorbent injection
Enhancing the use of coals by gas reburning-sorbent injection. Environmental monitoring quarterly report No. 9, July 1--September 30, 1992
Related Subjects
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
AIR POLLUTION ABATEMENT
BOILERS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
DATA
DEMONSTRATION PROGRAMS
DOCUMENT TYPES
ELECTROSTATIC PRECIPITATORS
ENERGY SOURCES
EQUIPMENT
EXPERIMENTAL DATA
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
INFORMATION
MATERIALS
NATURAL GAS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
POLLUTION CONTROL EQUIPMENT
PROGRESS REPORT
SORBENT INJECTION PROCESSES
STAGED COMBUSTION
SULFUR COMPOUNDS
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
US CLEAN COAL TECHNOLOGY PROGRAM