Comparative costs of flue gas desulfurization. Advantages of pressure hydrated lime injection
Costs of pressure-hydrated lime injection (PHLI) for the control of SO/sub 2/ emissions were developed and compared to lime spray dryer absorbers (SDA) operating under identical design conditions. In the PHLI process, dry sorbent is injected into the upper furnace region and the sulfated particulate collected in a downstream baghouse or electrostatic precipitator. In SDA processes, increasingly used for low sulfur coals, flue gas SO/sub 2/ contacts lime slurries in large reactor vessels with subsequent collection of the dried particulate in a downstream baghouse. Therefore PHLI can have decisive economic advantage over SDA due to the elimination of complex absorption vessels and water chemistry, and reactor pressure drop with overall reductions in labor and water consumption. The evaluations demonstrated PHLI cost-effectiveness over lime SDA over the entire range of operating conditions investigated. Under the worst conditions for PHLI, i.e., operating at the larger new plant, firing a 1% sulfur coal with a 25% sorbent utilization, PHLI affords a 25% savings in levelized revenue over SDA; for the analogous retrofit conditions, PHLI produces a 35% savings. When sorbent utilization rises to 75%, PHLI savings increase to about 65% of SDA costs for both new and retrofit designs. In absolute terms, capital costs for retrofit PHLI are low, ranging closely about $55 per kW at the 50% sorbent utilization rate; for the new plant, capital costs are more sensitive to sulfur content, ranging from $33 to $62, at a 50% utilization rate. 20 refs., 9 figs., 5 tabs.
- Research Organization:
- North Dakota Univ., Grand Forks (USA). Energy Research Center; USDOE Grand Forks Project Office, ND
- DOE Contract Number:
- FC21-83FE60181
- OSTI ID:
- 5849955
- Report Number(s):
- DOE/FE/60181-177; CONF-860634-2; ON: DE86011602
- Resource Relation:
- Conference: Joint symposium on dry SO/sub 2/ and simultaneous SO/sub 2//NO/sub x/ control technologies, Raleigh, NC, USA, 2 Jun 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
CALCIUM HYDROXIDES
CHEMICAL PREPARATION
COMBUSTION
ADDITIVES
DESULFURIZATION
COMPARATIVE EVALUATIONS
FLUE GAS
FOSSIL-FUEL POWER PLANTS
ADSORBENTS
AIR POLLUTION ABATEMENT
BAGHOUSES
CONSUMPTION RATES
COST
DRY SCRUBBERS
ECONOMICS
ELECTRIC POWER
ELECTROSTATIC PRECIPITATORS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHEMICAL REACTIONS
EQUIPMENT
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXIDES
OXIDATION
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
POLLUTION CONTROL EQUIPMENT
POWER
POWER PLANTS
SCRUBBERS
SYNTHESIS
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions