A urea injection control method, device and scr system
A technology of SCR system and urea injection, applied in muffler device, exhaust device, exhaust gas treatment and other directions, which can solve the problems of ammonia leakage, decreased ammonia storage capacity of catalyst, and large difference in storage capacity.
Active Publication Date: 2018-08-21
安徽汉马发动机有限公司
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Problems solved by technology
[0003] However, in the existing urea injection control process, due to the large difference in the storage capacity of the catalyst for ammonia under different temperature and other working conditions, it affects the conversion efficiency of nitrogen and oxygen, and may cause ammonia leakage
Especially in the dynamic working condition of rapid temperature rise, it is very easy to cause a large amount of ammonia leakage due to the decline of the ammonia storage capacity of the catalyst
Method used
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[0057] 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.
[0058] The embodiment of the present invention discloses a urea injection control method applied to an SCR system, see figure 1 As shown, the method includes:
[0059] Step S11: calculating the current temperature of the SCR catalytic converter;
[0060] Step S12: If the current temperature is in the first preset temperature range, correct the current urea injection amount according to the difference between the actual ammonia storage amount and the saturated...
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The invention discloses a urea jet control method and device and an SCR system. The method includes the steps that the current temperature of an SCR catalytic converter is calculated; if the current temperature is in a first preset temperature region, the current urea jet amount is corrected according to the difference between the actual ammonia storage amount and the ammonia saturation storage amount of the SCR catalytic converter under the current working condition; if the current temperature is in a second preset temperature region, the current urea jet amount is corrected according to the change of nitrogen-oxygen conversion efficiency. When the urea jet amount is controlled, high ammonia storage capacity of a catalyst in the low-temperature region and high nitrogen-oxygen conversion efficiency of the catalyst in the high-temperature region are fully utilized, precise control over the urea jet amount is achieved, nitrogen-oxygen conversion efficiency can be improved, and the ammonia leakage amount is reduced.
Description
technical field [0001] The invention relates to the technical field of exhaust post-treatment, in particular to a urea injection control method, device and SCR system. Background technique [0002] At present, in order to control the emission of diesel engine exhaust, it is usually required to install an SCR system (SCR, Selective Catalytic Reduction, Selective Catalytic Reduction) on the diesel engine to use SCR technology to reduce the NO in the exhaust X (nitrogen oxides) for emission control. Among them, the SCR technology sprays urea solution in the exhaust pipe to reduce nitrogen oxides to nitrogen and discharge, which has the advantages of good sulfur resistance. [0003] However, in the existing urea injection control process, due to the large difference in the storage capacity of the catalyst for ammonia under different temperature and other working conditions, the conversion efficiency of nitrogen and oxygen is affected, and ammonia leakage may be caused. Especia...
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IPC IPC(8): F01N3/20G06F17/50
CPCF01N3/208F01N2900/1616G06F30/00Y02T10/12
Inventor 马明彭升平钱文娟于洋晏根张理志曾卫良阮建兵王成亮
Owner 安徽汉马发动机有限公司