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Correction method, device, equipment and storage medium for urea injection amount

A technology of urea injection and injection volume, which is applied in the direction of mechanical equipment, exhaust devices, noise reduction devices, etc., and can solve the problems of chemical reactions that do not consider the uniformity of ammonia flow and uniformity of ammonia distribution, affect the control accuracy of urea injection volume, and the distribution of ammonia storage. Uniformity and other issues to achieve the effect of improving control accuracy and adaptability

Active Publication Date: 2022-08-05
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The control method of urea injection amount in the prior art does not consider the uniformity of ammonia flow, the uniformity of distribution of ammonia on the entire SCR cross-section, the hydrolysis of ammonia, pyrolysis and other chemical reactions, resulting in uneven distribution of ammonia storage, Affecting the control accuracy of urea injection volume

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  • Correction method, device, equipment and storage medium for urea injection amount
  • Correction method, device, equipment and storage medium for urea injection amount
  • Correction method, device, equipment and storage medium for urea injection amount

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Embodiment Construction

[0047] In order to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are for reference only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, numerous details are provided to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawings.

[0048] According to the background art, the method for controlling the injection amount of urea in the prior art does not take into account the uniformity of ammonia flow, the uniformity of ammonia distribution on the entire SCR cross-section, and chemical re...

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Abstract

The invention discloses a method for correcting urea injection amount, which includes: determining an initial SCR ammonia storage setting value and an original nitrogen oxide discharge amount; calculating a current ammonia storage actual value and nitrogen oxides according to a preset subregional SCR model conversion efficiency of urea; according to the ammonia storage set value and the ammonia storage actual value, the urea deviation injection amount is obtained; according to the nitrogen oxide conversion efficiency, the original nitrogen oxide discharge amount and the urea deviation injection amount Get the urea injection amount that needs to be supplemented. According to the correction method disclosed in the present invention, based on the characteristics of urea hydrolysis, storage, reaction, etc., the control deviation between theory and practice is identified, the injection amount of urea is more accurately controlled, and the control precision and adaptability of SCR model emission are effectively improved.

Description

technical field [0001] The invention relates to the technical field of exhaust gas treatment, in particular to a method, device, equipment and storage medium for correcting the injection amount of urea. Background technique [0002] Diesel engines will produce nitrogen oxides during operation. In order to meet regulatory emission requirements, SCR (Selective Catalystic Reduction, Selective Catalytic Reduction) devices are mostly installed in the aftertreatment systems of existing diesel engines. The catalyst sprays urea aqueous solution to reduce nitrogen oxides to pollution-free nitrogen, thereby reducing emissions and meeting the requirements of emission regulations. [0003] The control method of the urea injection amount in the prior art does not consider the flow uniformity of ammonia, the uniformity of ammonia distribution on the entire SCR cross-section, the hydrolysis of ammonia, pyrolysis and other chemical reactions, resulting in uneven distribution of ammonia stor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20
CPCF01N3/208F01N2610/02F01N2570/14F01N2900/1402F01N2900/1621Y02T10/12
Inventor 王建东张军杨海龙
Owner WEICHAI POWER CO LTD