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|1. (WO2017039268) EXHAUST GAS PURIFYING SYSTEM AND METHOD FOR MONITORING SAME|
|Applicants:||DOOSAN INFRACORE CO., LTD.
|Title:||EXHAUST GAS PURIFYING SYSTEM AND METHOD FOR MONITORING SAME|
An exhaust gas purifying system comprises: a reduction agent injecting module installed on a housing to inject a reduction agent into the housing, the housing capable of being mounted on an exhaust pipe through which exhaust gas from an engine is discharged; a selective catalyst reduction device installed behind the reduction agent injecting module within the housing to react nitrogen oxides in the exhaust gas with the reduction agent, which is injected by the reduction agent injecting module, to reduce the nitrogen oxides; a differential pressure sensor for measuring a pressure difference between the internal pressure of the housing in front of the selective catalyst reduction device and the internal pressure of the housing behind the selective catalyst reduction device; and a control device that receives pressure information from the differential pressure sensor and outputs a first warning signal when the received pressure is equal to or lower than a preset pressure.