Device for decreasing nitrogen oxides

Abstract

PURPOSE: To always secure a high denitrating efficiency by correcting the am ount of ammonia supply in accordance with the temperature of an exhaust gas. CONSTITUTION: At the entrance side of the denitration equipment 4 of an exhaust gas duct 2, an exhaust gas thermometer 24 to detect the exhaust gas temperature 23 is provided, a function generator 26, with which the correcting gain 25 for the exit concentration of the nitrogen oxide is obtained from the exhaust gas temperature 23, is provided, and a multiplier 28 to obtain the correcting exit concentration 27 of the nitrogen oxide, which is to be sent to a proportional integral adjustor 17 after multiplying the exit temperature 14 of the nitrogen oxide by the correcting gain 25 for the exit concentration of the nitrogen oxide, is provided. Also, the function generator 30 with which the correcting gain 29 for the advance supply amount of the ammonia is obtained from the above exhaust gas temperature 23 is provided, and the multiplier 32 to obtain the correcting advance supply amount 31 of the ammonia, which is to be sent to an adder 21 after multiplying the correcting gain 29 for the advance supply amount of the ammonia by the advance supply amount 20 of the ammonia, is provided. COPYRIGHT: (C)1992,JPO&Japio

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (0)

    Publication numberPublication dateAssigneeTitle

NO-Patent Citations (0)

    Title

Cited By (1)

    Publication numberPublication dateAssigneeTitle
    US-7543443-B2June 09, 2009Hino Motors, Ltd.Method for determining NOx reduction ratio in exhaust emission control device