Method for sulfur dioxide and nitrogen reduction in boiler stacks
Patent
·
OSTI ID:5151284
This patent describes a method for sulfur dioxide and nitrogen oxide reduction in combustion stack gas effluent. It includes feeding combustion gases from a boiler through a combustion stack fitted with stack extension of a diameter to reduce exit gas velocity below 20{prime} per second, the stack extension being fitted with a demister and a low pressure drop distillation tray located a minimum of two feet below the demister; flushing the demister at intervals with water; feeding through a circulating pump an iron chelate in an ammonia sulfite-sulfate solution through a liquid gas contactor means contiguous to a bottom of the demister while taking a side stream draw-off from the low pressure drop distillation tray to the circulating pump; feeding an ammonium sulfate solution from a cooling means into a circulating ammonium sulfite-sulfate stream draining from a bottom of the combustion stack while maintaining pH of the circulating ammonia sulfite-sulfate stream at a pH of approximately 6.8 with ammonia addition.
- Assignee:
- NOV; EDB-92-110615; NOV-92-029030
- Patent Number(s):
- A; US 5100634
- Application Number:
- PPN: US 7-589032
- OSTI ID:
- 5151284
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
AMMONIUM COMPOUNDS
AMMONIUM SULFATES
BOILERS
CHELATING AGENTS
CHEMICAL REACTION KINETICS
COMBINED SOXNOX PROCESSES
CONTROL
FLUE GAS
GASEOUS WASTES
KINETICS
MANAGEMENT
OXYGEN COMPOUNDS
POLLUTION CONTROL
REACTION KINETICS
SULFATES
SULFUR COMPOUNDS
WASTE MANAGEMENT
WASTES
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
AMMONIUM COMPOUNDS
AMMONIUM SULFATES
BOILERS
CHELATING AGENTS
CHEMICAL REACTION KINETICS
COMBINED SOXNOX PROCESSES
CONTROL
FLUE GAS
GASEOUS WASTES
KINETICS
MANAGEMENT
OXYGEN COMPOUNDS
POLLUTION CONTROL
REACTION KINETICS
SULFATES
SULFUR COMPOUNDS
WASTE MANAGEMENT
WASTES