Catalyst system for reducing N2O emission of SCR/SCRF (selective catalytic reduction/self-consistent reaction field) system of diesel engine

A catalyst and diesel engine technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, heterogeneous catalyst chemical elements, etc., can solve problems such as urea waste and secondary pollution

Inactive Publication Date: 2018-06-29
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In addition, NH as a reducing agent for the reaction 3 , if too much urea solution is injected, the excess NH 3 Will escape into the atmosphere, because ammonia is a greenhouse gas and is poisonous, the escaped ammonia not only causes waste of urea, but also forms secondary pollution

Method used

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  • Catalyst system for reducing N2O emission of SCR/SCRF (selective catalytic reduction/self-consistent reaction field) system of diesel engine
  • Catalyst system for reducing N2O emission of SCR/SCRF (selective catalytic reduction/self-consistent reaction field) system of diesel engine

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Embodiment

[0027] see figure 1 , a kind of reducing diesel engine SCR / SCRF system N described in one embodiment of the present invention 2 O emission catalyst system includes: DOC catalyst 2, urea injection device 4, control device, heating device 7, SCR / SCRF10 and N 2 O Catalyst 14. DOC Catalyst 2 for oxidation of NO to NO 2 , providing the appropriate NO / NO 2 Ratio, thereby improving SCR / SCRF to NO X conversion efficiency; the urea injection device 4 is used to inject urea into the exhaust pipe, and the NH produced by urea decomposition 3 Simultaneously as SCR and N 2 O is the reducing agent for the two reactions of catalytic reduction; the control device actively controls the catalytic environment of the system; the heating device 7 is arranged at the front end of the SCR / SCRF exhaust pipe of the diesel engine to heat the exhaust gas; the SCR / SCRF10 controls the exhaust NO in exhaust X process; N 2 O catalyst 14, reduce N 2 The activation energy of the O catalytic reduction r...

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Abstract

The invention discloses a catalyst system for reducing N2O emission of an SCR / SCRF (selective catalytic reduction / self-consistent reaction field) system of a diesel engine. The catalyst system comprises a DOC (diesel oxidation catalyst), a urea injection device, a heating device, a controller, the SCR / SCRF system and an N2O catalyst. The DOC is used for oxidizing NO to obtain NO2 and further improving the NOX conversion efficiency of the SCR / SCRF system; the urea injection device is used for injecting urea into exhaust pipes, and NH3 generated after the urea is decomposed can be used as a reducing agent for SCR and N2O catalytic reduction reaction; the heating device is arranged at the front end of the SCR / SCRF system of the exhaust pipes of the diesel engine and is used for heating exhausted gas; the controller is used for actively controlling catalytic environments according to data measured by sensors; NOX in the exhausted gas can be treated by the SCR / SCRF system; remaining NH3 inthe exhausted gas treated by the SCR / SCRF system is used as a reducing agent for carrying out catalytic reduction on N2O by the N2O catalyst, and accordingly the purpose of removing the N2O can be achieved.

Description

technical field [0001] The patent of the present invention relates to the field of aftertreatment of diesel engines, in particular to a system for reducing the SCR / SCRF of diesel engines N 2 Catalyst system for O emissions. Background technique [0002] Due to the advantages of large load, low specific fuel consumption, high thermal efficiency, durability, and good economy, diesel engines have been widely used in medium and heavy passenger and trucks. However, the NO X The emission problem is more serious. NO X It is one of the main pollutants in air pollutants and also the main pollutant emitted by diesel engines. Currently, the reduction of diesel NO X There are two main technical routes for emissions: optimized combustion + SCR route and EGR+DOC+DPF route. Among them, selective catalytic reduction (SCR) technology can meet the requirements of NO in higher emission standards. X The emission limits are generally adopted. The chemical reaction equation catalyzes NO in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28F01N3/20F01N9/00F01N11/00F01N3/10F01N3/035B01J23/83
CPCB01J23/002B01J23/83B01J2523/00F01N3/035F01N3/106F01N3/2006F01N3/2066F01N3/208F01N3/28F01N9/00F01N11/00F01N11/002F01N2560/021F01N2560/026F01N2560/06F01N2560/14F01N2570/14B01J2523/17B01J2523/27B01J2523/31B01J2523/3706Y02T10/12Y02T10/40
Inventor 王攀裔静雷利利李凯
Owner JIANGSU UNIV
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