Method for reduction of sulfur products for gases by injection of powdered alkali sorbent at intermediate temperatures

Patent · Tue Jan 28 04:00:00 EST 1992

OSTI ID:5316595

McElroy, M W; Beittel, R; Bartz, S J; Offen, G R

This patent describes a method for reducing the sulfur content of a combustion gas from a combustion installation comprising the step of injecting a dry powdered sorbent selected from the group consisting of calcium hydrate, magnesium hydrate, dolomite hydrate and mixtures thereof, into sulfur-containing gases at a location in the combustion installation where combustion gases are between 800 and 1200 degrees F., without the injection significantly decreasing the temperature of the gases, the injection of dry powdered sorbent providing during the residence time of the gases within the combustion installation a chemical reaction of the sorbent with SO{sub 2} and the combustion gases that converts at least 25 percent of the sorbent to sulfite, with the remaining unreacted sorbent being substantially alkali hydroxide.

• Assignee: Electric Power Research Inst., Inc., Palo Alto, CA (United States)
• Patent Number(s): A; US 5084256
• Application Number: PPN: US 7-565869
• OSTI ID: 5316595
• 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-)
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CARBONATE MINERALS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
DESULFURIZATION
DISPERSIONS
DOLOMITE
FLUE GAS
GASEOUS WASTES
HYDRATES
MAGNESIUM COMPOUNDS
MINERALS
MIXTURES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REMOVAL
SORBENT INJECTION PROCESSES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THERMOCHEMICAL PROCESSES
WASTES