Exhaust heat recovery boiler

F - Mech Eng,Light,Heat,Weapons – 02 – C

Patent

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Details

F02C 6/18 (2006.01) B01D 53/56 (2006.01) F22B 1/18 (2006.01) F22B 37/00 (2006.01)

Patent

CA 2249805

An exhaust heat recovery boiler in which an exhaust gas discharged from a gas turbine into a boiler duct to recover a heat of the exhaust gas and ammonia is injected to and mixed with the exhaust gas to reduce nitrogen oxide contained in the exhaust gas, the exhaust heat recovery boiler comprising: a boiler duct of a horizontal installation type having an inner hollow portion along which an exhaust gas flows from an upstream side to a downstream side; a superheater; an evaporator; a denitration reactor; and an economizer, which are disposed inside the boiler duct in this order from the upstream side to the downstream side of the exhaust gas flow therein. A drum is disposed outside the boiler duct and connected to the evaporator and a downcomer pipe extending from the drum into the boiler duct. An ammonia injection unit is disposed inside the boiler duct for injecting ammonia, and the ammonia injection unit is disposed upstream side of the evaporator closely to the downcomer pipe unit on either one of upstream side and downstream side of the downcomer pipe unit.

Divulgation d'une chaudière de récupération de chaleur des gaz d'échappement dans laquelle on introduit un gaz d'échappement provenant d'une turbine à gaz, afin d'en récupérer la chaleur. On injecte de l'ammoniac que l'on mélange avec le gaz d'échappement afin de réduire la teneur en oxyde d'azote de celui-ci. Cette chaudière de récupération de chaleur des gaz d'échappement comprend : un conduit du type de ceux installés horizontalement, comportant une partie creuse interne, le long de laquelle un gaz d'échappement circule d'amont en aval, un surchauffeur, un évaporateur, un réacteur de dénitrification et un économiseur, ces derniers étant disposés à l'intérieur du conduit, dans cet ordre d'amont en aval. Un fût est placé à l'extérieur du conduit et relié à l'évaporateur et à un tuyau de descente allant du fût à l'intérieur du conduit. On place un dispositif d'injection d'ammoniac à l'intérieur du conduit afin d'injecter de l'ammoniac, ce dispositif est placé en amont de l'évaporateur, à proximité du tuyau de descente, soit en amont, soit en aval de celui-ci.

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