Urs Corporation

Aecom Technical Services, Inc.

James B Jarvis

Sterling Michael Gray

Steven Kosler

Finely atomized alkaline sorbent salt solutions are injected into a hot flue gas stream to remove SO. Flash evaporation of the droplets produces very fine dried sorbent particles, which react efficiently with SOin the flue gas. The liquid sorbent may be sodium carbonate, sodium hydroxide, sodium sulfite, potassium carbonate, potassium hydroxide or the like. In a coal-fired boiler, the liquid sorbent may be injected after the economizer section, where the flue gas temperature is below 850&#xb0; F., and upstream of a particulate collection device. The dried sorbent particles react with SOand then are removed from the flue gas stream in the particulate collection device, producing a cleaned flue gas stream.

Process for removing SO2 from flue gases using liquid sorbent injection

Processes and methods exist for decreasing emissions of mercury upon combustion of fossil fuels such as coal. Halide salts can be effective when used at locations where they are thermally decomposed to form reactive halogen species, or in combination with an adsorbent material such as activated carbon. Halide salts, such as calcium bromide and sodium bromide, are not typically used at locations downstream of the economizer, where the temperature is typically below around 500&#xb0; C., because these salts are non-thermolabile and do not decompose to produce reactive halogen species. However, in flue gas streams that certain flue gas constituents, such as sulfur trioxide or sulfuric acid, reactive halogen species can be produced via chemical reaction. These species react with elemental mercury through various means to form an oxidized form of mercury that is more easily captured in downstream pollution control devices such as particulate control devices or SOscrubbers.

Growing community of inventors

Austin, TX, United States of America

James B Jarvis