Sulfur rate control system

Patent · Tue Jul 20 04:00:00 EDT 1993

OSTI ID:6184512

Bell, T A; Mullendore, M G; Kleinfeldt, T E; Walker, Jr, H G

A sulfur rate control system is described for substantially optimizing particulate removal performance of an electrostatic precipitator in fluid communication with a flue carrying combustion products of a fossil fuel, comprising: an electrostatic precipitator having an inlet for receiving a flue gas: means for injecting sulfur trioxide into a flue for mixing with said flue gas at a location preceding entry of said flue gas into said electrostatic precipitator, said injection of sulfur trioxide being varied responsive to a proportional control signal; and, control means coupled to both said flue and said sulfur trioxide injection means for generating said proportional control signal, said control means including (1) means for measuring a sulfur dioxide concentration quantity in said flue gas at a location preceding said sulfur trioxide injection means, (2) means for measuring a flow rate of particulates in said flue gas at a location preceding said sulfur trioxide injection means, and (3) a controller for calculating a ratio between said sulfur dioxide concentration quantity and said flow rate of particulates, said ratio calculating controller having a first input coupled to said sulfur dioxide measuring means and a second input coupled to said particulate flow rate measuring means for generating said proportional control signal in proportion to a difference between a predetermined value and said ratio between said sulfur dioxide concentration quantity and said flow rate of particulates, said ratio controller having an output coupled to said sulfur trioxide injection means for maximizing particulate removal efficiency of said electrostatic precipitator.

• Assignee: Environmental Elements Corp., Baltimore, MD (United States)
• Patent Number(s): US 5229077; A
• Application Number: PPN: US 7-745689
• OSTI ID: 6184512
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
& Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
CHALCOGENIDES
CHEMICAL REACTIONS
CLEANING
COMBUSTION
CONTROL EQUIPMENT
DESIGN
EFFICIENCY
ELECTROSTATIC PRECIPITATORS
ENERGY SOURCES
EQUIPMENT
FLOW RATE
FLUE GAS
FLUID INJECTION
FOSSIL FUELS
FUELS
GASEOUS WASTES
MONITORING
OPTIMIZATION
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
PERFORMANCE
POLLUTION CONTROL EQUIPMENT
REMOVAL
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFUR TRIOXIDE
THERMOCHEMICAL PROCESSES
WASTES