POWER PLANT WITH SELECTIVE CATALYTIC REUCTION SYSTEM

摘要

The present invention relates to a power apparatus including a selective catalytic reduction system capable of not only efficiently supplying compressed air to a heating device for supplying thermal energy required for decomposition of urea, but also maintaining the temperature of compressed air supplied to the heating device at a constant temperature or more. The power apparatus including a selective catalytic reduction system comprises: an engine to discharge exhaust gas containing nitrogen oxides; a turbocharger operated by the pressure of the exhaust gas of the engine to supply air for scavenging to the engine; a reactor containing a catalyst for reducing the nitrogen oxides contained in the exhaust gas of the engine; a main exhaust channel to connect the engine, the turbocharger, and the reactor in order, and to supply the exhaust gas of the engine passing through the turbocharger to the reactor; a urea decomposition chamber to generate ammonia by decomposing urea; an ammonia injection unit to inject ammonia generated in the urea decomposition chamber into the exhaust gas to be supplied to the reactor; an exhaust branch channel branched from the main exhaust channel between the turbocharger and the reactor, and connected with the urea decomposition chamber; a heating device installed on the exhaust branch channel to control the temperature of the exhaust gas flowing on the branch channel; and a scavenge branch channel to supply a part of the air for scavenging to the heating device as a part of the air for scavenging supplied to the engine is branched by the turbocharger.