Air-assisted SCR urea double-injection fault diagnosis system and method
A fault diagnosis system and air-assisted technology, applied in the diagnosis device of exhaust treatment device, air quality improvement, exhaust treatment and other directions, can solve the problem of affecting the stable operation of the system, NOx cannot be catalytically reduced, and faults can be detected quickly and in a timely manner and other problems, to achieve the effect of reducing NOx emissions, avoiding freezing or crystallization, and facilitating system maintenance
Active Publication Date: 2021-11-19
SINO TRUK JINAN POWER
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Problems solved by technology
However, with the further upgrading of emission requirements, it is difficult for a single SCR urea injection to meet the requirements of NOx conversion efficiency
[0004] For example, in the cold start stage of the engine, due to the characteristics of the SCR catalyst carrier itself, NOx cannot be catalytically reduced or even if it can be reduced, the conversion efficiency is low, which cannot meet the emission requirements of the whole machine
Moreover, during the SCR urea injection process, due to failures that cannot be detected quickly and in a timely manner, the failures cannot be effectively eliminated, which affects the stable operation of the system.
Method used
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[0054]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0055] The units and algorithm steps of each example described in the disclosed embodiments of the air-assisted SCR urea dual-injection fault diagnosis system provided by the present invention can be realized with electronic hardware, computer software or a combination of the two, in order to clearly illustrate the hardware and software interchangeability, the composition and steps of each example have been generally described in terms of functions in the above ...
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The invention provides an air-assisted SCR urea double-injection fault diagnosis system and method. The system comprises a compressed air storage cylinder, an SCR double-injection system, a urea nozzle A, a urea nozzle B and a urea box; the SCR double-injection system is connected with the compressed air storage cylinder and the urea box; the urea nozzle A is connected with the SCR double-injection system through an air pipe A and a urea pipe A; and the urea nozzle B is connected with the SCR double-injection system through an air pipe B and a urea pipe B. The system assists urea atomization in a compressed air mode, and the conversion efficiency is improved; faults can be found and removed in time. Residual urea is discharged through compressed air, and the system is prevented from being frozen or crystallized; the system is provided with two urea metering valves, and NOx emission is reduced; and the system is provided with four pressure sensors, the faults of the system can be rapidly diagnosed and positioned through a software strategy, and system maintenance is facilitated.
Description
technical field [0001] The invention relates to the field of SCR urea double injection, in particular to an air-assisted SCR urea double injection fault diagnosis system and method. Background technique [0002] Selective catalytic reduction technology SCR is a treatment process for NOx in diesel vehicle exhaust emissions, that is, under the action of a catalyst, the reducing agent ammonia or urea is injected to reduce the NOx in the exhaust gas to N2 and H2O. [0003] Nitrogen oxide (NOx) from heavy-duty diesel vehicles is one of the main pollutants in the atmosphere. In order to reduce the pollution of heavy-duty diesel vehicles to the atmosphere, there are currently regulations on the emission of harmful gases in the exhaust. Among them, urea-SCR technology is widely used because it can safely and effectively reduce engine NOx emissions. However, with the further upgrading of emission requirements, it is difficult for a single SCR urea injection to meet the requirements ...
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Patent Timeline
Login to View More IPC IPC(8): F01N11/00F01N3/20F01N9/00
CPCF01N11/00F01N3/2066F01N3/208F01N2610/02F01N2610/144F01N2610/1453F01N2610/146F01N2610/148F01N2900/1808Y02A50/20Y02T10/12Y02T10/40
Inventor 王秋花黄少文高发廷付广龙
Owner SINO TRUK JINAN POWER