Static mixer assembly suitable for use with injected gas in SCR and/or other applications

摘要

A static mixer is described in which rows of mixing plates are used in a combination with nozzles that are located with respect to the mixing plates in a manner that is designed to produce a high level of mixing without significantly impeding the flow of flue gas passing through the rows of mixer plates. In various embodiments, the static mixer includes rows of tilted plates, and the injection lance nozzles are positioned to align with row boundaries corresponding to the boundaries between consecutive rows of mixing plates. In some embodiments, there are N rows of mixing plates and N-1 rows of nozzles. In some embodiments the nozzles are positioned to coincide with the boundaries between rows. The mixer assembly including injection nozzles and/or lances can be implemented in a relatively compact manner allowing for it to be placed in a shorter length of flue than many other mixer assemblies.

主权项

1. A mixer assembly, comprising:
a duct configured to pass flue gas in a first direction, said first direction being a downstream direction; a plurality of rows of mixing plates in said duct, each row of mixing plates extending in a second direction in said duct, mixing plates in said rows of mixing plates each having an upstream end and a downstream end and being supported at a location between said upstream end and said downstream end, said second direction being perpendicular to said first direction, said plurality of rows of mixing plates forming a set of consecutive rows of mixing plates, each consecutive row being at a different location in a third direction, said third direction extending perpendicular to said first and second directions, a mixing plate row boundary, extending parallel to the rows of mixing plates, occurring in the third direction between each pair of adjacent rows of mixing plates in said set of consecutive rows of mixing plates, adjacent mixing plates in a first row of mixing plates alternating in angle with respect to the second direction, a first mixing plate in said first row being adjacent a first mixing plate in a second row of mixing plates in said plurality of rows of mixing plates and having a different angle with respect to the second direction than the first mixing plate in the second row; and a plurality of gas injection nozzles, positioned upstream of said rows of mixing plates, said nozzles being arranged in rows which are aligned in said third direction with mixing plate row boundaries.