A steam-enhanced SNCR system and methods of using the same

By using a mixed injection technology of medium-temperature and medium-pressure steam with ammonia and carbonyl hydrazine synergist, the problem of low denitrification efficiency of SNCR system in waste incineration power plant has been solved, achieving high efficiency and energy-saving denitrification effect.

CN121623543BActive Publication Date: 2026-06-05GRANDBLUE ENVIRONMENT CO LTD
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Patent Information

Application Number
CN202610147507.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-02-03
Publication Date
2026-06-05
Estimated Expiration
2046-02-03

AI Technical Summary

Technical Problem

Existing SNCR systems have low denitrification efficiency in waste-to-energy plants. Traditional methods require high-temperature, sub-high-pressure steam, which increases steam consumption and fails to completely vaporize ammonia water. Furthermore, there is a lack of synergists to improve efficiency.

Method used

Medium-temperature and medium-pressure steam (400℃, 4MPa) is mixed with 20% ammonia water and carbonyl hydrazine synergist, and a superheated mixture is formed through a coupling mixer. The mixture is then injected into the furnace for denitrification. Carbonyl hydrazine solution is used to adjust the oxygen content in the furnace to enhance the reaction efficiency.

Benefits of technology

It reduces steam consumption, decreases the requirements for steam sources, and improves denitrification efficiency, especially significantly enhancing the removal of nitrogen oxides under high oxygen content conditions.

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Abstract

The application discloses a steam enhanced SNCR system and a use method thereof, relates to the technical field of flue gas denitration treatment, and comprises the following steps: S1, a first conveying control unit is used for conveying main steam to a coupling mixer and controlling the flow of the main steam; S2, a second conveying control unit is used for conveying ammonia water and controlling the flow of the ammonia water; S3, a coupling processing unit is used for mixing the main steam and the ammonia water to form a mixture; S4, the second conveying control unit is used for conveying an efficiency improver and controlling the flow of the efficiency improver, and the coupling processing unit is used for mixing the main steam and the ammonia water mixture with the efficiency improver to form a target mixture in a superheated state; and S5, the coupling mixer is used for conveying the target mixture into a lance, and the lance is used for spraying the target mixture into an incinerator. According to the application, water is not added to dilute the ammonia water, and the steam consumption is greatly reduced; the medium-temperature and medium-pressure steam is used to replace the medium-temperature and high-pressure steam in other schemes, so that the requirement for steam quality is reduced; and when the oxygen content is too high, a hydrazine carbohydrazide solution is started to enhance the denitration reaction efficiency.
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