Exhaust purification device

An exhaust purification device comprising:

• a catalyst reactor having an upstream end configured to receive an exhaust gas and a downstream end, the catalyst reactor comprising:
• a NOx catalyst disposed between the upstream end and the downstream end;
• and
• a control device coupled to the catalyst reactor and configured to:
• identify an initial pressure difference which is the pressure difference at an initial state;
• identify an operating pressure difference which is the pressure difference at an operating state;
• determine a pressure difference rise amount based on a difference between an operating pressure difference and the initial pressure difference;
• and
• generate an output signal responsive to a determination that the pressure difference rise amount exceeds a first predetermined reference pressure threshold amount;
• a pressure sensor coupled to the control device and configured to generate a signal associated with a pressure difference between an upstream exhaust pressure of the catalyst reactor and a downstream exhaust pressure of the catalyst reactor;
• and
• a display or a speaker coupled to the control device, the display or the speaker configured receive the output signal and to indicate replacement of the NOx catalyst of the exhaust purification device is needed.

A method of operating an exhaust purification device, the method comprising:

• receiving, at a control device, a first reference pressure difference threshold amount;
• determining an initial pressure difference of an exhaust purifier at an initial state;
• determining an operating pressure difference of the exhaust purifier at an operating state, the operating state subsequent to the initial state;
• calculating a pressure difference amount based on the initial pressure difference and the operating pressure difference;
• comparing, by the control device, the pressure difference amount to the first reference pressure difference threshold amount;
• generating, by the control device an output signal based on the pressure difference amount being greater than or equal to the first reference pressure difference threshold amount;
• and
• switching an operating mode of a soot blower from a standard mode to a washing mode based on the pressure difference amount being greater than or equal to a second reference pressure difference threshold amount.