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Selective catalytic reduction how it works


Carbon dioxide, CO 2 is a reaction product when urea is used as the reductant.
Contents Chemistry edit The NO x reduction reaction takes place as the gases pass through the catalyst chamber.In the case of selective catalytic reduction, a catalytic converter converts the nitrogen oxides contained in the exhaust gas into water vapor and nitrogen.MTU has also transferred this high-volume production expertise to larger engines with power outputs of up to 3,000 kW and has developed an economical modular concept for SCR metering devices and catalytic converters, with each module using two metering devices.The DEF tank fill opening is designed to accommodate a DEF fill nozzle to ensure only DEF is put into the tank.For the underfloor rail powerpack equipped with the V engine, MTU is even developing a complete SCR system that, in addition to the catalytic converter and metering system, includes a reducing agent tank, heater and piping.SCR can reduce NOx emissions up to 90 percent while simultaneously reducing HC and CO emissions by 50-90 percent, and PM emissions by 30-50 percent.SCR has been used for decades to reduce stationary source emissions.DPR is a diesel particulate filtration system with regeneration process that uses late fuel injection to control exhaust temperature to burn off soot.
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This occurs when ammonia is over-injected into gas stream, temperatures are too low for ammonia to react, or catalyst has degraded (see above).




Honeycomb configurations are smaller than plate types, but have higher pressure drops and plug much more easily.At the same time, the drive system is optimized for low fuel consumption and a minimal space requirement for the SCR components.That ensures compliance with stringent emission limits for diesel engines.System development at MTU.This frequently means that depending on the emission standard applicable the need for an additional diesel particulate filter (DPF) in the exhaust system can be eliminated.Other issues that must be considered in using SCR for NO x control in power plants are the formation of ammonium sulfate and ammonium bisulfate due to the sulfur content goibibo voucher code of the fuel as well as the undesirable catalyst-caused formation of SO 3 from the.
SCR technology is designed to permit nitrogen oxide (NOx) reduction reactions to take place in an oxidizing atmosphere.




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