Exhaust Gas Purification Device

Abstract

An exhaust gas purification device ( 1 ) comprising a main exhaust passage ( 2 ) and a branch exhaust passage ( 3 ) connected to an exhaust passage ( 100 ) on the engine side; shutoff valves ( 4 A) and ( 4 B) capable of shutting off exhaust gas at the exhaust inlets ( 2 a ) and ( 3 a ) of the main exhaust passage ( 2 ) and the branch exhaust passage ( 3 ); a nitrogen oxide adsorbing material ( 5 ); an adsorbed material detachment unit ( 6 ), having an air nozzle ( 61 ); and a combustion device ( 7 ) including an air nozzle ( 71 ), a fuel nozzle ( 72 ) and an ignition plug ( 73 ), wherein the exhaust gas from the exhaust passage ( 100 ) on the engine side is discharged directly from the exhaust outlet ( 3 b ) of the branch exhaust passage ( 3 ).

1 . An exhaust gas purification device connected to an exhaust passage on the engine side of an internal combustion engine or a burning appliance, comprising:
 a main exhaust passage and a branch exhaust passage connected to the exhaust passage on the engine side;   an exhaust gas shutoff unit capable of shutting off exhaust gas at the exhaust inlets of the main exhaust passage and the branch exhaust passage;   a nitrogen oxide adsorbing material, disposed inside the main exhaust passage, for temporarily adsorbing nitrogen oxides in an excess air atmosphere and for detaching the adsorbed nitrogen oxides in a rising temperature atmosphere or a reducing atmosphere;   an adsorbed material detachment unit, disposed on the exhaust upstream side of the nitrogen oxide adsorbing material inside the main exhaust passage and having an air supply unit, for setting the atmosphere of the air supplied from the air supply unit to the rising temperature atmosphere or the reducing atmosphere; and   a combustion device disposed on the exhaust downstream side of the nitrogen oxide adsorbing material inside the main exhaust passage and including an air supply unit, a fuel supply unit and an ignition unit,   wherein the branch exhaust passage is configured so that the exhaust gas from the exhaust passage on the engine side is discharged directly without being processed.   
     
     
         2 . The exhaust gas purification device according to  claim 1 , further comprising a filter member disposed on the exhaust downstream side of the combustion device inside the main exhaust passage and being capable of trapping particulate matter contained in the exhaust gas. 
     
     
         3 . The exhaust gas purification device according to  claim 1 , further comprising a sulfur oxide adsorbing material, disposed on the exhaust upstream side of the nitrogen oxide adsorbing material and on the exhaust downstream side of the adsorbed material detachment unit inside the main exhaust passage, for temporarily adsorbing sulfur oxides in the excess air atmosphere and for detaching the adsorbed sulfur oxides in the rising temperature atmosphere or the reducing atmosphere. 
     
     
         4 . An exhaust gas purification device connected to an exhaust passage on the engine side of an internal combustion engine or a burning appliance, comprising:
 a main exhaust passage and a branch exhaust passage connected to the exhaust passage on the engine side;   an exhaust gas shutoff unit capable of shutting off exhaust gas at the exhaust outlet of the main exhaust passage and at the exhaust inlet of the branch exhaust passage, respectively; a nitrogen oxide adsorbing material, disposed inside the main exhaust passage, for temporarily adsorbing nitrogen oxides in an excess air atmosphere and for detaching the adsorbed nitrogen oxides in a rising temperature atmosphere or a reducing atmosphere;   an adsorbed material detachment unit, disposed on the exhaust downstream side of the nitrogen oxide adsorbing material inside the main exhaust passage and having an air supply unit, for setting the atmosphere of the air supplied from the air supply unit to the rising temperature atmosphere or the reducing atmosphere in correspondence with the nitrogen oxide adsorbing material;   a sulfur oxide adsorbing material disposed on the exhaust upstream side of the nitrogen oxide adsorbing material inside the main exhaust passage and being capable of adsorbing sulfur oxides;   a combustion device disposed on the exhaust upstream side of the sulfur oxide adsorbing material inside the main exhaust passage and including an air supply unit, a fuel supply unit and an ignition unit;   a filter member disposed on the exhaust upstream side of the combustion device inside the main exhaust passage and being capable of trapping particulate matter contained in the exhaust gas; and   a controller for performing normal operation and regeneration operation, wherein   the branch exhaust passage is configured so that the exhaust gas from the exhaust passage on the engine side is discharged directly without being processed,   the controller opens the exhaust outlet of the main exhaust passage and closes the exhaust inlet of the branch exhaust passage by using the exhaust gas shutoff unit during the normal operation to allow the exhaust gas to pass through the main exhaust passage, and   the controller closes the exhaust outlet of the main exhaust passage and opens the exhaust inlet of the branch exhaust passage by using the exhaust gas shutoff unit during the regeneration operation, and operates the adsorbed material detachment unit and the combustion device to allow the air flow generated by virtue of the exhaust gas shutoff unit and the air supply unit of the combustion device to pass through the main exhaust passage in a direction opposite to the flow direction of the exhaust gas.   
     
     
         5 . The exhaust gas purification device according to  claim 2 , further comprising a sulfur oxide adsorbing material, disposed on the exhaust upstream side of the nitrogen oxide adsorbing material and on the exhaust downstream side of the adsorbed material detachment unit inside the main exhaust passage, for temporarily adsorbing sulfur oxides in the excess air atmosphere and for detaching the adsorbed sulfur oxides in the rising temperature atmosphere or the reducing atmosphere.