EXHAUST GAS PURIFICATION DEVICE AND TEMPERATURE CONTROL METHOD THEREFOR

The present invention is an exhaust gas purification device (1, 501) for purifying exhaust gas containing a combustible toxic component. This exhaust gas purification device comprises a plurality of heat storage chambers (13) which are each provided with a heat storage element (11) therein and provided with a pair of an air supply port and an air evacuation port (21, 23), a combustion chamber (15) which is formed to communicate with the upper parts of the plurality of heat storage chambers, air evacuation and air supply valves (17, 19) which are mounted to the air supply port and the air evacuation port of each of the heat storage chambers in order to perform switching between the supply of air to and the evacuation of air from the heat storage chamber, a heating burner (25) which is provided in the combustion chamber, a heat discharge damper (27) which discharges surplus heat from the combustion chamber, and a microcomputer (MC) which ignites/extinguishes the heating burner on the basis of a combustion chamber temperature (t1) and controls the temperature such that the combustion chamber temperature becomes a set value (SP) by adjusting the degree of opening of the heat discharge damper. This microcomputer determines whether early combustion, in which the temperature of exhaust gas rises to a self-burning temperature or higher when the exhaust gas passes the heat storage element, and the exhaust gas burns before arriving at the combustion chamber, is performed or not, when determining that the early combustion is performed, executes an early combustion countermeasure operation for forcibly opening the heat discharge damper and extinguishing the heating burner, and thereafter when determining that the early combustion is not performed, cancels the early combustion countermeasure operation. La présente invention concerne un dispositif de purification de gaz d'échappement (1, 501) permettant de purifier un gaz d'échappement contenant un composant toxique combustible. Le présent dispositif de purification de gaz d'échappement comprend une pluralité de chambres de stockage de chaleur (13) qui sont chacune pourvues d'un élément de stockage de chaleur (11) à l'intérieur et pourvues d'une paire constituée d'un orifice d'alimentation en air et d'un orifice d'évacuation d'air (21, 23), une chambre de combustion (15) qui est formée de manière à communiquer avec les parties supérieures de la pluralité de chambres de stockage de chaleur, des soupapes d'évacuation d'ai