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Title: Economic recovery and utilization of boiler flue gas pollutants

This patent describes a method of removing unwanted pollutants from flue gas streams from power plants. It comprises passing flue gas containing lime, sulphur dioxide and water in succession through at least three vertically extending beds of particulates, the particulates being disposed in a duct such that the flue gas is passed through substantially all of the particulates, reacting lime, sulphur dioxide and water in the flue gas to form gypsum at a first bed of particulates; reacting sulphur dioxide and water in the flue gas to form sulphuric acid, and collecting sulphuric acid below its condensation temperature at a second bed of particulates; reacting sulphur dioxide in the flue gas with an alkali material to form bisulphites and bisulphates at a third bed of particulates; and removing the pollutants from the particulates of the beds.
Authors:
;
Publication Date:
OSTI Identifier:
5469407
Report Number(s):
US 5061467; A
PPN: US 7-549200
Resource Type:
Patent
Resource Relation:
Patent File Date: 6 Jul 1990
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 20 FOSSIL-FUELED POWER PLANTS; 54 ENVIRONMENTAL SCIENCES; FLUE GAS; POLLUTION CONTROL EQUIPMENT; FOSSIL-FUEL POWER PLANTS; WASTE MANAGEMENT; WASTE PRODUCT UTILIZATION; INDUSTRIAL WASTES; MATERIALS RECOVERY; ECONOMICS; AIR POLLUTION CONTROL; GYPSUM; PARTICULATES; POLLUTANTS; RESOURCE CONSERVATION; SULFUR DIOXIDE; CHALCOGENIDES; CONTROL; EQUIPMENT; GASEOUS WASTES; MANAGEMENT; MINERALS; OXIDES; OXYGEN COMPOUNDS; PARTICLES; POLLUTION CONTROL; POWER PLANTS; PROCESSING; RECOVERY; SULFATE MINERALS; SULFUR COMPOUNDS; SULFUR OXIDES; THERMAL POWER PLANTS; WASTE PROCESSING; WASTES 320305* -- Energy Conservation, Consumption, & Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management; 200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions; 540120 -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (1990-)