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SELECTIVE CATALYTIC REACTOR IN-LINE INJECTION SYSTEM AND METHOD

IP.com Disclosure Number: IPCOM000246683D
Publication Date: 2016-Jun-27
Document File: 8 page(s) / 61K

Publishing Venue

The IP.com Prior Art Database

Abstract

An industrial plant equipped with a selective catalytic reactor in-line injection system and a method of using the selective catalytic reactor in-line injection system are disclosed for use in reducing nitrogen oxides (NOx) in combustion flue gas comprising NOx for compliance with environmental regulations. The subject industrial plant comprises a selective catalytic reactor arranged downstream of an in-line ammonia or ammonia water injection system. The in-line ammonia or ammonia water injection system uses injectors of a type similar to the diesel fuel injectors manufactured for and used in the automotive industry. In using injectors of a type similar to the diesel fuel injectors from the automotive industry for reducing NOx in combustion flue gas comprising NOx, certain advantages are achieved. Such advantages of using injectors of a type similar to the diesel fuel injectors from the automotive industry for an in-line ammonia or ammonia water injection system include reduced injected ammonia or ammonia water droplet size allowing for a reduced distance between the in-line injection system and the selective catalytic reactor, increased injection momentum for increased mixing between the injected ammonia or ammonia water and the flue gas, individually controlled injectors and injector valves, controlled injection amount through control of opening time of a pulsed valve, improved tuning and online tuning with sensor measurements regarding NOx, and/or like pollutants, reduced number of or elimination of in duct static mixing devices, and decreased capital and operating costs.

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Page 01 of 8

SELECTIVE CATALYTIC REACTOR IN-LINE INJECTION SYSTEM AND METHOD

Disclosed by General Electric Company; Lars-Erik JOHANSSON

Abstract

    An industrial plant equipped with a selective catalytic reactor in-line injection system and a method of using the selective catalytic reactor in-line injection system are disclosed for use in reducing nitrogen oxides (NOx) in combustion flue gas comprising NOx for compliance with environmental regulations. The subject industrial plant comprises a selective catalytic reactor arranged downstream of an in-line ammonia or ammonia water injection system. The in-line ammonia or ammonia water injection system uses injectors of a type similar to the diesel fuel injectors manufactured for and used in the automotive industry. In using injectors of a type similar to the diesel fuel injectors from the automotive industry for reducing NOx in combustion flue gas comprising NOx, certain advantages are achieved. Such advantages of using injectors of a type similar to the diesel fuel injectors from the automotive industry for an in-line ammonia or ammonia water injection system include reduced injected ammonia or ammonia water droplet size allowing for a reduced distance between the in-line injection system and the selective catalytic reactor, increased injection momentum for increased mixing between the injected ammonia or ammonia water and the flue gas, individually controlled injectors and injector valves, controlled injection amount through control of opening time of a pulsed valve, improved tuning and online tuning with sensor measurements regarding NOx, and/or like pollutants, reduced number of or elimination of in duct static mixing devices, and decreased capital and operating costs.

 


Page 02 of 8

SELECTIVE CATALYTIC REACTOR IN-LINE INJECTION SYSTEM AND METHOD

Disclosed by General Electric Company; Lars-Erik JOHANSSON

    An industrial plant equipped with a selective catalytic reactor in-line injection system and a method of using the selective catalytic reactor in-line injection system are disclosed for use in reducing nitrogen oxides (NOx) in combustion flue gas FG comprising NOx for compliance with environmental regulations. The subject industrial plant is equipped with a selective catalytic reactor in-line injection system comprising a selective catalytic reactor arranged downstream of an in-line ammonia or ammonia water injection system. The in-line ammonia or ammonia water injection system is arranged at least partially in a duct downstream of a combustion unit. The combustion unit may for example be a boiler used in power generation. Within the combustion unit, a fuel F is combusted producing a flue gas FG comprising pollutants such as NOx. This flue gas FG comprising pollutants such as NOx flows through the duct contacting and mixing with ammonia or ammonia water injected into the duct by the in-line ammonia or ammonia water injection system. Injected ammonia water is typically about 25 percent ammo...