Exhaust gas treatment apparatus having diffusing means

1. An exhaust gas treatment apparatus comprising:

a preprocessor configured to primarily remove harmful substances from exhaust gas produced by combustion; and

a postprocessor configured to further remove harmful substances from preprocessed gas, which is the exhaust gas from which the harmful substances have been primarily removed by the preprocessor,

the postprocessor comprising:

a postprocessor housing having a preprocessed gas inlet through which the preprocessed gas is introduced and a postprocessed gas outlet through which postprocessed gas from which harmful substances have been further removed by the postprocessor is discharged and forming a flow path of the preprocessed gas therein; and

a diffuser disposed adjacent to the preprocessed gas inlet so as to be spaced apart from the preprocessed gas inlet and configured to diffuse the preprocessed gas introduced through the preprocessed gas inlet;

wherein the diffuser comprises a body formed so as to vertically cover a front portion of the preprocessed gas inlet, the body having a plurality of through-holes,

wherein an upper end of the body and a lower end of the body are inclined or curved from a central portion of the body towards the preprocessed gas inlet.

2. The exhaust gas treatment apparatus of claim 1 , wherein the body of the diffuser forms an overall curved shape.

3. The exhaust gas treatment apparatus of claim 2 , wherein two or more diffusers are arranged in sequence in front of the preprocessed gas inlet.

4. The exhaust gas treatment apparatus of claim 1 , wherein the preprocessor comprises:

a preprocessor housing having an exhaust gas inlet through which the exhaust gas is introduced and a preprocessed gas outlet through which the preprocessed gas, which is the exhaust gas from which the harmful substances have been primarily removed by the preprocessor, is discharged and forming a flow path of the exhaust gas therein; and

an agitator configured to cause the exhaust gas in the flow path to flow in a curved pattern.

5. The exhaust gas treatment apparatus of claim 4 , wherein the agitator is arranged to cover the flow path inside the preprocessor housing and comprises a body in a center thereof and blades radially coupled to the body at a predetermined torsion angle.

6. The exhaust gas treatment apparatus of claim 5 , wherein the agitator has space portions formed between the blades and through which the exhaust gas passes without colliding with the blades.

7. The exhaust gas treatment apparatus of claim 6 , wherein the agitator is fixed and preventing from rotating.

8. The exhaust gas treatment apparatus of claim 4 , wherein the preprocessor further comprises:

a first preprocessor sprayer disposed between the exhaust gas inlet and the agitator and configured to spray cleaning liquid to the exhaust gas introduced through the exhaust gas inlet; and

a second preprocessor sprayer disposed between the agitator and the preprocessed gas outlet and configured to spray cleaning liquid to the exhaust gas that flows in a spiral pattern by passing through the agitator in the flow path.

9. The exhaust gas treatment apparatus of claim 8 , wherein the first preprocessor sprayer sprays the cleaning liquid in the form of microdroplets, compared to the second preprocessor sprayer.

10. The exhaust gas treatment apparatus of claim 9 , wherein the first preprocessor sprayer sprays the cleaning liquid in the form of droplets having a particle diameter of 100 to 200 μm.

11. The exhaust gas treatment apparatus of claim 10 , wherein the second preprocessor sprayer sprays the cleaning liquid in the form of droplets having a particle diameter of 500 to 1,000 μm.

12. The exhaust gas treatment apparatus of claim 8 , wherein the exhaust gas treatment apparatus comprising the diffuser is installed in a ship, and

wherein the harmful substances comprise sulfur oxides (SOx).

13. The exhaust gas treatment apparatus of claim 1 , wherein a first gas flow direction defined by the preprocessed gas inlet is perpendicular to a second gas flow direction defined by the postprocessed gas outlet.

14. The exhaust gas treatment apparatus of claim 1 , wherein a longitudinal axis of the postprocessor is perpendicular to a longitudinal axis of the preprocessed gas inlet.

15. An exhaust gas treatment apparatus comprising:

a preprocessor configured to primarily remove harmful substances from exhaust gas produced by combustion,

the preprocessor comprising:

a preprocessor housing having an exhaust gas inlet through which the exhaust gas is introduced and a preprocessed gas outlet through which preprocessed gas, which is the exhaust gas from which the harmful substances have been primarily removed by the preprocessor, is discharged and forming a flow path of the exhaust gas therein,

an agitator configured to cause the exhaust gas in the flow path to flow in a curved pattern,

a first preprocessor sprayer disposed between the exhaust gas inlet and the agitator and configured to spray cleaning liquid to the exhaust gas introduced through the exhaust gas inlet, and

a second preprocessor sprayer disposed between the agitator and the preprocessed gas outlet and configured to spray cleaning liquid to the exhaust gas that flows in a spiral pattern by passing through the agitator in the flow path; and

a postprocessor configured to further remove harmful substances from preprocessed gas, which is the exhaust gas from which the harmful substances have been primarily removed by the preprocessor,

the postprocessor comprising:

a postprocessor housing having a preprocessed gas inlet through which the preprocessed gas is introduced and a postprocessed gas outlet through which postprocessed gas from which harmful substances have been further removed by the postprocessor is discharged and forming a flow path of the preprocessed gas therein; and

a diffuser disposed adjacent to the preprocessed gas inlet and configured to diffuse the preprocessed gas introduced through the preprocessed gas inlet.