SYSTEM CONTROL METHOD

To solve a problem that NOx elimination is deteriorated due to partial oxidation of ammonia in a range of 350°C to 500°C of an exhaust gas high temperature region regardless of NOx selective reduction in an SCR exhaust gas aftertreatment system.SOLUTION: Provided is a system control method in which...

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Bibliographische Detailangaben
1. Verfasser:	KITAMURA TAKEAKI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BLASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF 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 INORGANIC CHEMISTRY LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION STEAM ENGINES THEIR RELEVANT APPARATUS TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	To solve a problem that NOx elimination is deteriorated due to partial oxidation of ammonia in a range of 350°C to 500°C of an exhaust gas high temperature region regardless of NOx selective reduction in an SCR exhaust gas aftertreatment system.SOLUTION: Provided is a system control method in which a catalyst is zeolite containing copper and a consumption amount by partial oxidation of ammonia is supplied by controlling an ammonia amount that is an equimolar amount of NOx in exhaust gas, in an NOx selective catalytic reduction system using urea and/or ammonia.SELECTED DRAWING: Figure 3 【課題】ＳＣＲ排ガス後処理システムにおいて、排ガス高温域の３５０℃から５００℃までの範囲で、ＮＯｘ選択還元に係わらずアンモニアが部分酸化によりＮＯｘ浄化が低下する課題があった。【解決手段】本発明は、尿素および／またはアンモニアを用い、ＮＯｘを選択触媒還元システムにおいて、触媒が、銅を含むゼオライトであって、アンモニアの部分酸化による消費量を、排ガス中のＮＯｘと等モル量となるアンモニア量を制御して供給することを特徴とする、システム制御方法である。【選択図】図３