Emission apparatuses for sensor cross-sensitivity to ammonia and associated systems and methods

A system for reducing emissions in an exhaust gas flow, the system comprising:

• an ammonia capture media in an extraction member, an inlet end of the extraction member in fluid communication with the exhaust gas flow and receiving a first exhaust gas sample from the exhaust gas flow, the ammonia capture media for reducing gaseous ammonia in the first exhaust gas sample;
• a post-capture sensor positioned downstream of the ammonia capture media, the post-capture sensor configured to measure at least one downstream NOx concentration measurement of the first exhaust gas sample;
• a processor in communication with the post-capture sensor and an ammonia generation means the processor configured to:
• receive the at least one downstream NOx concentration measurement from the post-capture sensor;
• determine an aggregate NOx concentration measurement based on the at least one downstream NOx concentration measurement;
• and
• transmit a control signal to an ammonia producing means based on the aggregate NOx concentration measurement, the ammonia producing means is positioned in the exhaust gas flow upstream of the extraction member;
• wherein the post-capture sensor are cross-sensitive to ammonia.

A method for reducing emissions in an exhaust gas flow, the method comprising:

• extracting, from the exhaust gas flow into an inlet of an extraction member, a first exhaust gas sample;
• reducing, using an ammonia capture media within the extraction member, a gaseous ammonia concentration in the first exhaust gas sample;
• measuring, at a post-capture sensor positioned downstream from the ammonia capture media, at least one downstream NOx concentration measurement of the first exhaust gas sample;
• receiving, at a processor, the at least one downstream NOx measurement;
• determining, at the processor, an aggregate NOx concentration measurement based on the at least one downstream NOx concentration measurement;
• transmitting, from the processor to an ammonia producing means positioned in the exhaust gas flow, a control signal based on the aggregate NOx concentration measurement;
• and
• wherein the post-capture sensor are cross-sensitive to ammonia.