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Ship SCR system ammonia spraying amount control method based on ARMAX and MMPC

A technology of SCR system and control method, which is applied in the direction of electronic control of exhaust gas treatment device, exhaust gas treatment, mechanical equipment, etc., can solve the problems of weak robustness, low denitration efficiency, and large amount of ammonia escape.

Inactive Publication Date: 2021-04-09
SHANGHAI MARITIME UNIVERSITY
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  • Description
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  • Application Information

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Problems solved by technology

[0016] Due to the shortcomings of the traditional PID ammonia injection quantity control subsystem, such as slow dynamic response and weak robustness, it is easy to cause problems such as low denitrification efficiency and large amount of ammonia escape

Method used

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  • Ship SCR system ammonia spraying amount control method based on ARMAX and MMPC
  • Ship SCR system ammonia spraying amount control method based on ARMAX and MMPC
  • Ship SCR system ammonia spraying amount control method based on ARMAX and MMPC

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Embodiment

[0067] S1, S2: According to the change of diesel engine exhaust NOx concentration obtained from the data of a marine diesel engine experimental platform, according to S1, the working state of marine diesel engine is mainly divided into three working conditions: economic working condition, standard working condition and overload working condition. According to the division of these three working conditions, the marine diesel engine exhaust data is divided into three parts; then according to S2, the diesel engine exhaust data is used as the entry data of the SCR denitrification mathematical mechanism model for simulation. Figure 6 It is the inlet and outlet NOx concentration map under economic conditions, the inlet NOx concentration changes mainly in the range of 3500-5500ppm, and the concentration amplitude change range is about 2000ppm; Figure 7 It is the inlet and outlet NOx concentration diagram under the standard working condition. The concentration change of the inlet NOx...

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Abstract

The invention provides a ship SCR system ammonia spraying amount control method based on ARMAX and MMPC. The method is improved for solving the problem that the control precision of a traditional ship diesel engine SCR denitration system is reduced under the condition of variable working conditions. The control method comprises the steps that the working conditions of a marine diesel engine are divided into three working conditions according to the concentration of nitrogen oxide at an inlet; a mechanism simulation experiment platform of the SCR denitration system is established in MATLAB, and simulation under three working conditions is carried out; ARMAX model identification ammonia spraying control system models under different working conditions are obtained according to the offline data obtained by simulation; and an MMPC controller is designed on the basis of the identified ammonia spraying control models; According to the ship SCR system ammonia spraying amount control method based on ARMAX and MMPC, the obtained control model can predict the working condition of the system according to the concentration of the nitrogen oxide at the inlet, different MPC algorithms are automatically switched according to the change of the working condition to adjust the ammonia spraying amount needed by the system, and the escape amount of ammonia gas can be reduced while the denitration efficiency is improved.

Description

technical field [0001] The invention relates to marine diesel engine tail gas denitrification, in particular to an ammonia injection amount control method under multiple working conditions of a marine diesel engine SCR denitrification system based on an ARMAX identification model and MMPC. Background technique [0002] With the increase in the number of ships, the problem of air pollution caused by the exhaust of marine diesel engines is becoming more and more serious. In order to reduce the emission of nitrogen oxides (Nitric Oxide, NOx) in exhaust, the International Maritime Organization (IMO) has formulated Relevant regulations, the 58th meeting of the Marine Environmental Protection Committee passed the revised regulations of "MARPOL Convention 73 / 78 Annex VI", which stipulates a more stringent emission standard Tier III. Tier III regulations start from January 1, 2016. Exhaust emissions are reduced to 20% of the Tier I emissions stage. In order to meet Tier III emissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N9/00F01N3/20
CPCF01N3/208F01N2610/02F01N2900/04Y02T10/12Y02T10/40
Inventor 许媛媛李昊董冠男夏同飞解翔梁璟旻
Owner SHANGHAI MARITIME UNIVERSITY
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