Abstract: A gas temperature control apparatus for a DeNOx boiler in an engine cogeneration plant is installed to maintain a reaction temperature of denitrification catalyst used to remove nitrogen oxide generated from an internal combustion engine in the engine cogeneration plant. The apparatus includes a connection passageway between a high-temperature gas part of a combustion tank of the boiler and an intermediate-temperature gas part formed after a first heat exchange, and a flow control valve mounted in the passageway to thereby control a volume of bypass combustion gas. The apparatus can easily raise temperature of combustion gas even though temperature of the inside water of the boiler does not reach a normal operation state since the flow control valve mounted in the connection passageway between the high-temperature gas part and the intermediate-temperature gas part. thereby greatly reducing a time period to reach an activation temperature of the denitrification catalyst.

Abstract: A burner for generating a reductive atmosphere of exhaust gas in a boiler system of an engine cogeneration plant having a denitrification process comprises a post-combustion burner for combusting an internal combustion engine exhaust gas, and an auxiliary burner installed in an outer side of the post-combustion burner. The internal combustion exhaust gas is supplied from an internal combustion engine exhaust gas injection port. The auxiliary burner is combined with a fuel injection port through which fuel is supplied, and an air channel through which air inflows. Combustion heat generated by combusting the supplied fuel and air is provided to a combustion chamber of the post-combustion burner through a flame channel.

Abstract: A gas temperature control apparatus for a DeNOx boiler in an engine cogeneration plant is installed to keep a reaction temperature of denitrification catalyst used to remove nitrogen oxide generated from an internal combustion engine in the engine cogeneration plant. The apparatus includes a connection passageway between a high-temperature gas part of a combustion tank of the boiler and an intermediate-temperature gas part formed after a first heat exchange, and a flow control valve mounted in the passageway to thereby control a volume of bypass combustion gas. The apparatus can easily raise temperature of combustion gas even though temperature of the inside water of the boiler does not reach a normal operation state since the flow control valve mounted in the connection passageway between the high-temperature gas part and the intermediate-temperature gas part, thereby greatly reducing a time period to reach an activation temperature of the denitrification catalyst.