Boiler ammonia injection grid

By using a linearly equidistant array of ammonia injection units and 304 stainless steel pipes, the problems of low denitrification efficiency and high ammonia escape rate caused by the ammonia injection grid structure are solved, achieving uniform coverage of ammonia gas and efficient denitrification in the SCR reactor, and ensuring stable operation of the equipment.

CN224524454UActive Publication Date: 2026-07-21QUZHOU DONGGANG ENVIRONMENTAL THERMOELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
QUZHOU DONGGANG ENVIRONMENTAL THERMOELECTRIC CO LTD
Filing Date
2025-08-18
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The existing ammonia injection grid structure results in a large flue cross-section for the denitrification unit, low denitrification efficiency, and high ammonia escape rate, which affects the reliable operation of the boiler tail air preheater.

Method used

The ammonia injection units are arranged in a linear equidistant array. Through a graded delivery structure consisting of a first delivery pipe, a first delivery branch pipe, and a second delivery pipe, ammonia gas is precisely distributed to each ammonia injection pipe, so that it is evenly covered in the horizontal and vertical directions within the SCR reactor, avoiding injection blind spots. 304 stainless steel pipes are used to resist corrosion and high temperature.

Benefits of technology

This achieves uniform coverage of ammonia gas within the SCR reactor, reduces ammonia escape rate, improves denitrification efficiency, ensures stable equipment operation, and meets environmental standards.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a boiler ammonia injection grid, including a plurality of ammonia injection units, a plurality of ammonia injection units are linear equidistance array distribution in the inside of SCR reactor, a plurality of ammonia injection units all include first delivery pipe, and the both sides of one end of first delivery pipe all are linked with first delivery branch pipe, and the both sides of the one end of two first delivery branch pipes away from first delivery pipe all are linked with second delivery pipe, and a plurality of ammonia injection pipes that are linked with second delivery pipe are arranged on second delivery pipe, and a plurality of ammonia injection pipes are linear equidistance array distribution along the axial direction of second delivery pipe, the utility model discloses a linear equidistance array distribution's ammonia injection unit, and the hierarchical delivery structure that cooperation first delivery pipe, first delivery branch pipe and second delivery pipe constitute, make ammonia gas in SCR reactor horizontal and vertical direction evenly cover, thoroughly eliminate injection blind area, make ammonia gas and flue gas fully mix, effectively avoid ammonia gas local excess, effectively reduce ammonia gas escape rate.
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