Equipment for mixing fluid streams
A kind of equipment and fluid technology, which is applied in the field of equipment for mixing two fluid flows, can solve the problems of increased fuel consumption, pressure loss, and inability to fully ensure the homogeneous mixing of exhaust gas flow and secondary air, so as to reduce pressure loss and improve homogeneity effect
Inactive Publication Date: 2021-05-25
WITZENMANN GMBH
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- Description
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- Application Information
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Problems solved by technology
The supply of secondary air to the exhaust gas flow accordingly takes place only "point by point", wherein a homogeneous mixing of the exhaust gas flow and secondary air up to the OPF cannot be ensured sufficiently
However, the setting of the mixer is accompanied by a severe pressure loss, which in turn leads to an increase in fuel consumption
Method used
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Embodiment Construction
[0044] figure 1 The purely schematic block diagram shows the flow-related relationships when secondary air is injected into the exhaust system of a motor vehicle with a gasoline engine. In this case, the secondary air pump (see reference number 4) is fixedly mounted on the engine or assembly. Arrows indicate the direction of flow of the fluid involved (secondary air or exhaust gas). Reference numeral 1 denotes a catalytic converter (KAT), reference numeral 2 denotes a decoupling element EKE, and reference numeral 3 denotes a gasoline particle filter (OPF). Accordingly, the exhaust gas flow A first reaches the KAT 1 , then the EKE 2 and from there to the OPF 3 . Reference numeral 4 denotes a unit or device for injecting secondary air S. As shown in FIG. Secondary air is usually introduced into the exhaust train (exhaust gas flow A) between KAT 1 and EKE 2 . Secondary air can be used to allow sufficient oxygen to be present in the exhaust to regenerate the OPF 3 so that the ...
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Abstract
An apparatus for mixing fluid flows is proposed, comprising: a conduit section having a longitudinal length for a first fluid flow; and an annular flow space arranged around said conduit section at least over a part of said longitudinal length at least one input line leading to the annular flow space for introducing a second fluid flow into the annular flow space; and at least one of the following feature complexes a) and b): a) when introducing the annular flow space a number of openings in a wall separating the flow space from the conduit section, the apertures allowing diversion of at least a portion of the second fluid flow from the annular flow space into the conduit section b) a wall separating the annular flow space from the line section, which wall extends with a free end into the line section or its extension in one region, so that the annular flow The space is fluidly connected in this region to the interior of the line section via an air gap.
Description
technical field [0001] The invention relates to a device for mixing two fluid streams. Background technique [0002] In order to be able to meet future exhaust gas limit values in actual driving cycles, additional measures for reducing particle emissions are also required in gasoline engines. It is foreseeable that gasoline particulate filters (OPF) are increasingly being used for this purpose. The OPF is installed in the underbody region of the motor vehicle and is located downstream of the catalytic converter (KAT) and the usually present decoupling element (EKE) in the direction of flow of the exhaust gas flow. In order to be able to regenerate the OPF, oxygen is required in the exhaust gas flow, but it must be supplied separately in gasoline engines, since gasoline engines, unlike diesel engines, run without oxygen remaining. [0003] According to the prior art, in order to regenerate the OPF, air is blown into the exhaust system, ie into the exhaust gas flow, by mea...
Claims
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IPC IPC(8): F01N3/30F01N13/08B01F3/02B01F5/04B01F23/10
CPCF01N3/30F01N13/08F01N2270/00B01F23/19B01F23/10B01F25/314F01N3/05F01N3/22F01N2240/20F01N2270/04Y02T10/12B01F25/31423B01F25/31425
Inventor 马提亚·波普大卫·埃伦伯格
Owner WITZENMANN GMBH