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Method, device and equipment for correcting urea injection amount and storage medium

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, ammonia distribution uniformity, 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: 2021-04-09
WEICHAI POWER CO LTD
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  • 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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  • Method, device and equipment for correcting urea injection amount and storage medium
  • Method, device and equipment for correcting urea injection amount and storage medium
  • Method, device and equipment for correcting urea injection amount and storage medium

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Embodiment Construction

[0047] In order to understand the characteristics and technical content 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 in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present disclosure. In the following technical description, for purposes of explanation, numerous details are set forth in order 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 technology, it can be seen that the control method of urea injection quantity in the prior art does not consider the flow uniformity of ammonia, the uniform distribution of ammonia...

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Abstract

The invention discloses a method for correcting the urea injection amount. The method comprises the steps that the initial SCR ammonia storage set value and the original emission amount of nitric oxide are determined; the current ammonia storage actual value and the conversion efficiency of the nitric oxide are calculated according to a preset regional SCR model; the urea deviation injection amount is obtained according to the ammonia storage set value and the ammonia storage actual value; and according to the conversion efficiency of the nitric oxide, the original emission amount of the nitric oxide and the urea deviation injection amount, the urea injection amount needing to be supplemented is obtained. According to the correction method, based on the characteristics of urea hydrolysis, storage, reaction and the like, the control deviation between the theory and the reality 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 tail 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 the emission requirements of regulations, most of the aftertreatment systems of existing diesel engines are equipped with SCR (Selective Catalystic Reduction, Selective Catalytic Reduction) devices. 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 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 ammoni...

Claims

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Application Information

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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