Mixer box, a use thereof and a method for mixing

Patent metadata

Field	Value
Publication number	US-2020003101-A1
Application number	US-201716486240-A
Country	US
Kind code	A1
Filing date	Feb 20, 2017
Priority date	Feb 20, 2017
Publication date	Jan 2, 2020
Grant date	—

Abstract

Mixer box for mixing, vaporization and decomposition of a liquid additive to the exhaust gas flow from a combustion engine, comprising a gas inlet (108), a gas outlet (109) and internal duct means establishing a gas flow path (A-H, a-h) from the gas inlet (108) to the gas outlet (109). The duct means includes a first duct portion (107) having an outer wall (171) and an inner wall (161), which is surrounded by the outer wall (171), such that the gas flow path through said first duct portion (107) is established inbetween. The first duct portion (107) is provided with at least two partitions (121-124) extending between the outer wall (171) and the inner wall (161), which separate the first duct portion (107) into at least two duct sections (101a, 101b, 102a, 102b) of which at least one is an upstream duct section (101a, 101b) and at least one is a downstream duct section (102a, 102b).

First claim

1 .- 18 . (canceled)

19 . A mixer box for mixing and complete or partial vaporization and/or decomposition of a liquid additive to the exhaust gas flow from a combustion engine, which mixer box has a gas inlet ( 108 ), a gas outlet ( 109 ) and internal duct means establishing a gas flow path (A-H) from the gas inlet ( 108 ) to the gas outlet ( 109 ), which duct means includes a first duct portion ( 107 ) having an outer wall ( 171 ) and an inner wall ( 161 ), the inner wall ( 161 ) being surrounded by the outer wall ( 171 ), such that the gas flow path through said first duct portion ( 107 ) thereby is established between said walls ( 161 , 171 ), said first duct portion ( 107 ) is provided with at least two partitions ( 121 - 124 ) extending between the outer wall ( 171 ) and the inner wall ( 161 ) and separating said first duct portion ( 107 ) into at least two duct sections ( 101 a , 101 b, 102 a, 102 b ) of which at least one is an upstream duct section ( 101 a, 101 b ) and at least one is a downstream duct section ( 102 a, 102 b ), wherein the duct means further includes a second duct portion ( 106 ), which second duct portion ( 106 ) is surrounded by the first duct portion ( 107 ), characterized in that a liquid injection means ( 112 ) is arranged to inject liquid into the second duct portion ( 106 ), and where the liquid injection means ( 112 ) is provided in an end wall of the second duct portion ( 106 ).

20 . A mixer box according to claim 19 , wherein the number of said partitions ( 121 - 124 ) is at least four and the number of said duct sections ( 101 a, 101 b, 102 a, 102 b ) is at least four, and wherein every second duct section as seen in the circumferential direction is an upstream duct section ( 101 a , 101 b ) and every second duct section is a downstream duct section ( 102 a, 102 b ).

21 . A mixer box according to claim 20 , wherein the duct means includes an upstream re-mixing chamber ( 104 ) and each upstream duct section ( 101 a, 101 b ) has a gas outlet connected to and communicating with the upstream re-mixing chamber ( 104 ).

22 . A mixer box according to claim 20 , wherein the duct means includes a downstream re-mixing chamber ( 105 ) and each downstream duct section ( 102 a, 102 b ) has a gas outlet ( 121 a ) connected to and communicating with the downstream re-mixing chamber ( 105 ).

23 . A mixer box according to claim 19 , wherein the duct means is arranged to provide a first turn (C) of the gas flow direction 180°.

24 . A mixer box according to claim 23 , wherein the duct means is arranged to provide a second turn (E) of the gas flow direction at least 90°, which first (C) and second (E) turns are located at different positions in the gas flow path.

25 . A mixer box according to claim 24 , wherein the second duct portion ( 106 ) has an outer wall that is common to the inner wall ( 161 ) of the first duct portion ( 107 ).

26 . A mixer box according to claim 24 , wherein the duct means has said upstream duct section(s) ( 101 a, 101 b ) located upstream of said second duct portion ( 106 ) and said second duct portion ( 106 ) located upstream of said downstream duct portion(s) ( 102 a, 102 b ).

27 . A mixer box according to claim 23 , wherein the duct means has the second duct portion arranged upstream of the upstream duct section(s) and said upstream duct section(s) located upstream of said downstream duct section(s).

28 . A mixer box according to claim 19 , wherein the duct means includes a heating surface ( 110 , 113 ) arranged to be hit by the gas flow and heat the gas.

29 . A mixer box according to claim 28 , wherein the duct means includes said second duct portion ( 106 ), which second duct portion ( 106 ) is surrounded by the first duct portion ( 107 ) which second duct portion ( 106 ) has an outer wall that is common to the inner wall ( 106 ) of the first duct portion ( 107 ), and wherein the heating surface ( 110 , 113 ) includes a part of a said common wall ( 161 ) and/or an end wall of ( 113 ) the second duct portion ( 106 ), and where gas flowing in the first duct portion ( 101 a, 101 b ) acts as a heat source for heating the heating surface ( 110 , 113 ).

30 . A combustion engine system ( 51 - 53 ) including a mixer box ( 52 ) according to claim 19 .

31 . A vehicle, a vessel or a stationary plant ( 50 ) including a combustion engine system ( 51 - 53 ) according to claim 30 .

32 . A use of the mixer box according to claim 19 , wherein said liquid additive contains urea and wherein the gas/liquid-mixture is used for selective catalytic reduction.

Assignees

• Volvo Penta Corp

Inventors

• Kannisto Hannes

Classifications

• F01N2590/10

  for stationary applications · CPC title

• F01N2610/02

  the substance being ammonia or urea · CPC title

• F01N2470/10

  Tubes having non-circular cross section · CPC title

• F01N2470/08

  Exhaust gas passages being formed between the walls of an outer shell and an inner chamber · CPC title

• F01N2470/24

  Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled · CPC title