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Ammonia concentration correction method at front end of scr catalyst and scr processing system

A technology of SCR catalyst and ammonia concentration, which is applied in exhaust gas treatment, electronic control of exhaust gas treatment device, machine/engine, etc. It can solve the problems of inaccurate estimation of sensor errors, changes, and different sensor cross-sensitivity factors.

Active Publication Date: 2019-08-27
LIANCHUANG AUTOMOBILE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cross-sensitivity factors are different between sensors and may change over time and environment
It can be seen that these two methods have certain disadvantages in theory.
At the same time, there may be inaccurate estimates of sensor errors, etc.

Method used

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  • Ammonia concentration correction method at front end of scr catalyst and scr processing system
  • Ammonia concentration correction method at front end of scr catalyst and scr processing system
  • Ammonia concentration correction method at front end of scr catalyst and scr processing system

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Embodiment Construction

[0028] A method for correcting the ammonia concentration of an SCR catalytic converter of a diesel engine according to the present invention comprises:

[0029] Get SCR Catalyst Front NO X Concentration, diesel engine speed value, diesel engine torque value, SCR catalytic converter inlet temperature value and calculated exhaust gas mass flow value.

[0030] According to the pyrolysis and hydrolysis reactions of urea, adsorption and desorption of ammonia, NO X Catalytic reduction reaction of nitrogen oxides, NH 3 Oxidation and chemical reaction calculation of urea SCR catalyst to obtain SCR catalyst back-end NO X The simulated concentration;

[0031] Pyrolysis and hydrolysis of urea;

[0032] Urea generates ammonia gas after evaporation, pyrolysis, hydrolysis and other reactions, and the evaporation of urea:

[0033]

[0034] NH 2 -CO-NH 2 Indicates solid ammonia;

[0035] Pyrolysis of urea:

[0036] Hydrolysis of urea: HNCO+H 2 O→NH 3 +CO 2

[0037] Adsorptio...

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Abstract

The invention discloses a diesel engine SCR front end ammonia concentration modification method. The simulation concentration of NOX at the rear end of an SCR catalytic converter is calculated by obtaining the SCR catalytic converter front end NOX concentration, the rotation speed value of a diesel engine, the torque value of the diesel engine, the temperature value of an SCR catalytic converter inlet and by calculating exhaust mass flow value. The simulation concentration serves as feedback to modify the injection amount of a urea nozzle at the front end of the SCR catalytic converter. The invention further discloses an SCR treatment system. According to the diesel engine SCR front end ammonia concentration modification method and the SCR treatment system, the front end ammonia concentration of the SCR catalytic converter can be modified accurately, urea over-injection caused by the error of the front end ammonia concentration of the SCR catalytic converter is then avoided, pollutantemission of the diesel engine is lowered, and the requirement of environmental protection is met.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a method for correcting ammonia concentration at the front end of an SCR catalytic converter of a diesel engine. The invention also relates to a diesel engine SCR processing system. Background technique [0002] Diesel engines are widely used in automobiles, ships, tanks and construction machinery because of their high thermal efficiency, good adaptability, strong durability, and high output power. However, according to statistics, the NO of diesel vehicles X (Nitrogen oxides) and particulate matter emissions account for 70% of vehicle pollutant emissions, becoming one of the important sources of air pollution in my country. According to the national conditions of my country's crude oil with high sulfur content, SCR+ optimizes the combustion route, that is, reduces the generation of particulate matter by optimizing the combustion in the engine cylinder, and then uses SCR (selective c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/208F01N9/007F01N2560/026F01N2570/14F01N2610/02F01N2610/146F01N2900/08F01N2900/1411Y02A50/20Y02T10/12Y02T10/40
Inventor 栗工李振鹏袁文莉许朕孙涛吉河波胡志展罗来军
Owner LIANCHUANG AUTOMOBILE ELECTRONICS