Field of the invention
[0001]This invention relates to the field of exhaust gas treatment system.
Background of the invention
[0002] NOx reduction is one the emission control technology to meet the emerging emission requirements worldwide. NOx reduction technique involves dosing aqueous urea along the exhaust flow path. Urea when mixed with exhaust gas results in conversion of nitrous oxides into N2 and H2O. As the exhaust flow along the exhaust flow path for NOx reduction, a part of exhaust gets deposited along the walls of the exhaust flow path, a phenomena called as wall wetting. As the deposition rate increases, the chances of crystal formation along the walls of exhaust increases, leading to decrease in NOx reduction efficiency, and increase in back pressure along the exhaust flow path.
[0003]Prior art patent application US8443595 discloses in a structure of an additive-agent diffusion plate in an exhaust passage, the exhaust passage is an exhaust passage for an engine. The additive-agent diffusion plate includes a plurality of collision portions; and a plurality of communication portions that allow exhaust gas flowing in the exhaust passage to flow from an area upstream of the additive-agent diffusion plate to an area downstream of the additive-agent diffusion plate in an exhaust-gas flow direction. The additive-agent diffusion plate diffuses an additive agent injected into the exhaust passage, at a position upstream of an exhaust gas purification device, which is disposed in the exhaust passage, in the exhaust-gas flow direction. Each of the collision portions protrudes toward an upstream side in the exhaust-gas flow direction, and a cross section of each of the collision portions increases

from the upstream side toward a downstream side of the exhaust-gas flow direction.
Brief description of the accompanying drawing
[0004] Different modes of the invention are disclosed in detail in the description
and illustrated in the accompanying drawing:
[0005] FIG. 1 illustrates a spray deflector plate for an exhaust gas system.
Detailed description of the embodiments
[0006] FIG. 1 illustrates a spray deflector plate for an exhaust gas system 100. The exhaust gas system 100 comprises an exhaust flow path 102, a dosing module 104 for dosing exhaust fluid into the exhaust flow path 102. An SCR module 106 located downstream to the exhaust flow path 102. A plate is located along the exhaust flow path 102 and at the interface of said exhaust flow path 102 and said dosing module 104, the plate is adapted to deviate the flow of exhaust from the exhaust flow path 102 towards the SCR module 106. The plate 108 may be removably attached along the exhaust flow path 102. Alternately, the plate may be permanently attached along said exhaust flow path 102.
[0007]The working of the exhaust gas system 100 will be explained in further detail. The exhaust gas system 100 is used to reduce NOx emission by dosing an aqueous solution of urea along the exhaust flow path 102. From the outlet port (not shown) of the internal combustion engine, the exhaust gases flow through the exhaust flow path 102. A part of the exhaust gas impinges onto the plate that is located along the exhaust flow path 102. The plate comprises a fixed element 107 and a flat member 109 that is exposed to exhaust. The

fixed element may be permanently or removably attached to the walls of the exhaust flow path 102. The flat member may comprise perforations for allowing exhaust to flow through. Since the flat member of the plate element protrudes into the exhaust flow path 102, there is a deviation in the flow of exhaust, this deviation causes the exhaust to flow in a direction that is away from the walls of the exhaust flow path 102. With this deviation in the flow of exhaust, the impingement of exhaust on to the walls of the exhaust flow path 102 is thus prevented.
[0008] By using the above mentioned plate it is now possible to deflect the flow of exhaust away from the walls of the exhaust flow path. This prevents the exhaust from being deposited onto the walls of the exhaust flow path 102 and thereby preventing formation of deposits. The spray deflector plate helps in enabling optimum thermal working condition of dosing module. The spray deflector plate deflects high thermal gradients away from the tip of dosing module and supports effective functionality over life.
[0009] ‘Adapted’ or ‘arranged’, in the context of the instant disclosure, refers to the technical capability or the technical capacity of a component, in relation to which the term ‘adapted’ or ‘arranged’ is used, to carry out or executed a specified action or actions, upon the requirement of the specified action or actions to be carried out or executed. Moreover, the usage of the term ‘adapted’ or ‘arranged’ here, is in reference with the normal technical capability or technical capacity of the component, imparted by the design or the structure or the composition of the component, and not in reference with any special or extraneous capability or capacity, beyond the scope of the normal technical capability or technical capacity. Therefore there is a need to address this problem.

[0010]It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention in terms of the type of plate used. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.

We Claim:
1. A spray deflector plate for an exhaust gas system (100), said exhaust
gas system 100 comprising:
an exhaust flow path (102);
a dosing module (104) for dosing exhaust fluid into said exhaust
flow path (102);
an SCR module (106) located downstream to said exhaust flow
path (102); characterized in that:
a plate (108) located along said exhaust flow path (102) and at
the interface of said exhaust flow path (102) and said dosing
module (104), said plate (108) adapted to deviate the flow of
exhaust from said exhaust flow path towards the SCR module
(106).
2. The exhaust gas system 100 of claim 1, wherein said plate (108) is removably attached along said exhaust flow path 102.
3. The exhaust gas system (100) of claim 1, wherein said plate is permanently attached along said exhaust flow path 102.
4. The exhaust gas system (100) of claim 1, wherein said plate comprises a flat member, said flat member comprising perforations.