Reducing mercury emissions from the burning of coal

Details Reducing mercury emissions from the burning of coal Reducing mercury emissions from the burning of coal

F - Mech Eng,Light,Heat,Weapons

23

B

F23B 90/00 (2011.01)

Patent

CA 2601325

Processes and compositions are provided for decreasing emissions of mercury upon combustion of fuels such as coal. Various sorbent compositions are provided that contain components that reduce the level of mercury and/or sulfur emitted into the atmosphere upon burning of coal. In various embodiments, the sorbent compositions are added directly to the fuel before combustion; are added partially to the fuel before combustion and partially into the flue gas post combustion zone; or are added completely into the flue gas post combustion zone. In preferred embodiments, the sorbent compositions comprise a source of halogen and preferably a source of calcium. Among the halogens, iodine and bromine are preferred. In various embodiments, inorganic bromides make up a part of the sorbent compositions.

Cette invention concerne des procédés et des compositions permettant de réduire les émission de mercure lors de la combustion de combustibles, tels que le charbon. Cette invention concerne diverses compositions adsorbantes contenant des composants qui permettent de réduire le niveau de mercure et/ou le niveau de soufre émis dans l'atmosphère lors de la combustion de charbon. Dans divers modes de réalisation, les compositions adsorbantes sont ajoutées directement au combustible avant la combustion; les compositions adsorbantes sont ajoutées en partie au combustible avant la combustion et en partie dans les fumées après la zone de combustion; ou encore, les compositions adsorbantes sont ajoutées uniquement dans les fumées après la zone de combustion. Dans des modes de réalisation privilégiés, les compositions adsorbantes comprennent une source d'halogène et, de préférence, une source de calcium. Parmi les halogènes, l'iode et le brome sont privilégiés. Dans divers modes de réalisation, des bromures inorganiques constituent une partie des compositions adsorbantes.

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