Apparatus for the monitoring and/or controlling of selective catalytic reduction processes

• Main Authors: Hoyte, Scott M, Mitra, Chayan, Badami, Vivek V, Banerjee, Ayan
• Format: Patent
• Language: English; French; German
• Published: 04.11.2020
• Subjects: BLASTING; COLORIMETRY; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT; MEASURING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; RADIATION PYROMETRY; SEPARATION; STEAM ENGINES; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; TRANSPORTING; WEAPONS

A system for the monitoring and/or controlling emission levels of nitrogen oxide and a reductant from a stream of combustion exhaust, wherein the internal combustion engine 116 includes a SCR unit disposed in the stream of combustion exhaust between an upstream conduit 124 and a downstream conduit 126, the SCR unit having a catalyst that is configured to catalytically reduce nitrogen oxides contained in the combustion exhaust to elemental nitrogen in the presence of a reductant and oxygen, and wherein the internal combustion engine 116 further includes a reductant injector 212; the system comprising: a laser absorption spectroscopy unit 300 that is disposed in the downstream conduit 126 and configured to measure the concentration level of at least nitrogen oxide and the reductant in the exhaust; and a control unit 216.