Reducing agent pyrolysis system for selective catalytic reduction apparatus

A reducing agent pyrolysis system for a selective catalytic reduction apparatus, the reducing agent pyrolysis system comprising:

• an elbow duct, which is installed on an exhaust duct at a front end of a reactor, allows exhaust gas to flow into the elbow duct, and allows the exhaust gas to be discharged toward the reactor;
• an inner pipe unit, which is disposed in the elbow duct and allows a part of the exhaust gas to flow into and be discharged from the inner pipe unit;
• a burner or electric heater, which is installed in the inner pipe unit and heats the exhaust gas flowing into the inner pipe unit;
• a nozzle, which is installed in the inner pipe unit, is disposed at a rear end of the burner or electric heater based on a flow of the exhaust gas, and injects a reducing agent into the inner pipe unit;
• and
• a valve unit, which is installed at a portion of the inner pipe unit where the exhaust gas flows in,
• wherein a flow rate of the exhaust gas flowing into the inner pipe unit is controlled by controlling an opening and closing operation of the valve unit.