Exhaust gas treating apparatus and treating method

An exhaust gas treating apparatus for treating an exhaust gas emitted from an outlet of an engine, comprising:

• an adsorption tower that has an adsorption layer filled with an adsorbent and a heat transfer path located within the adsorption tower through which heat is transferred to the adsorption layer;
• a first exhaust gas flow path from the outlet of the engine through a branch point (A) to the adsorption layer that introduces the exhaust gas emitted from the outlet of the engine into the adsorption layer of the adsorption tower;
• a second exhaust gas flow path from the outlet of the engine through the branch point (A) to the heat transfer path that introduces the exhaust gas emitted from the outlet of the engine into the heat transfer path of the adsorption tower, wherein a path between the outlet of the engine and the branch point (A) is a single common path for the first exhaust gas flow path and the second exhaust as flow path, and the first exhaust gas flow path is separated from the second exhaust gas flow path at the branch point (A);
• a first desorption gas flow path that introduces a desorption gas into the adsorption layer;
• a first cooling gas flow path that introduces a cooling gas into the adsorption layer;
• and
• a second cooling gas flow path between the adsorption layer and an inlet of the engine, which introduces the cooling gas that has passed through the adsorption layer into the inlet of the engine.