Dual-mode purification method of marine hydrogen internal combustion engine exhaust gas low-temperature plasma

By monitoring and dynamically adjusting plasma power in real time, the emission problems of particulate matter, NOx, and unburned hydrogen in the exhaust gas of hydrogen internal combustion engines were solved, achieving improved purification efficiency and safety throughout the entire process and ensuring stable system operation.

CN122106722APending Publication Date: 2026-05-29TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TONGJI UNIV
Filing Date
2026-01-23
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies have failed to effectively address the emission issues of particulate matter, NOx, and unburned hydrogen in the exhaust gas of hydrogen internal combustion engines under different operating conditions, and have not considered the impact of different ambient temperatures and humidity on discharge efficiency, resulting in insufficient system stability and safety.

Method used

By monitoring engine parameters in real time and utilizing cryogenic plasma technology, combined with sensors and ECU control, dynamic regulation of plasma power is achieved, including basic power setting, temperature correction, closed-loop control of hydrogen concentration, and diversion valve adjustment, ensuring efficient conversion of unburned hydrogen and NOx degradation, and avoiding the impact of extreme temperatures on the equipment.

Benefits of technology

It achieves efficient purification of exhaust gas under different operating conditions, ensuring the safety and stability of the system, improving the conversion efficiency of unburned hydrogen and the removal effect of NOx, and avoiding equipment wear and carbon buildup problems.

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Abstract

This invention discloses a dual-mode purification method for low-temperature plasma of exhaust gas from marine hydrogen internal combustion engines, comprising the following steps: real-time acquisition of relevant parameters of the hydrogen internal combustion engine, including engine speed and plasma generator inlet exhaust temperature T. D Plasma generator cavity wall temperature T 腔 Unburned hydrogen concentration at inlet and outlet C 氢 in / C 氢 out, exhaust flow rate F 排 and ozone concentration C 臭氧 The plasma base power P is determined based on the engine speed range and the corresponding exhaust flow rate. 0； Combined with exhaust temperature T D The interval characteristics yielded the initial power P 初 At the same time, priority is given to determining the cavity wall temperature T. 腔 If T 腔 If the temperature exceeds 500 ℃, immediately shut down the plasma power supply and open the bypass pipeline to enter safe mode; invoke the pre-constructed 3D map of "temperature-flow rate-hydrogen concentration-minimum power" on the test bench, combined with real-time acquired T... D F 排 C 氢 The query retrieves the minimum plasma discharge power P. D Control the plasma generator according to P D Operation. According to this invention, both purification and safety are ensured, thereby guaranteeing the safe elimination of unburned hydrogen, the efficient degradation of nitrogen oxides and particulate matter, and ensuring the stability and reliability of emission control throughout the entire flight.
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