Method and system for reducing concentration of oxynitride in flue gas of glass kiln

By combining vertical flue gas SNCR and horizontal flue gas SCR in the glass furnace flue gas denitrification system, and by optimizing reaction conditions using urea injection units and control units, the problems of high cost and low nitrogen oxide conversion rate of glass furnace flue gas denitrification equipment have been solved, achieving efficient flue gas denitrification and low-cost operation.

CN121869064APending Publication Date: 2026-04-17ZHENGZHOU XUFEI OPTOELECTRONICS TECH
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Patent Information

Application Number
CN202610301603.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-12
Publication Date
2026-04-17

AI Technical Summary

Technical Problem

Existing technologies for denitrification of flue gas in glass kilns, such as SCR and SNCR, are expensive and cannot meet denitrification requirements. Furthermore, they have low ammonia utilization and low nitrogen oxide conversion rates.

Method used

The system employs a vertically arranged first flue for SNCR reaction and a horizontally arranged second flue for SCR reaction. Urea solution is injected into the first flue using a urea injection unit. The reaction conditions are optimized by a control unit to achieve the combined use of SNCR and SCR, thereby reducing ammonia slip and improving urea utilization.

Benefits of technology

It significantly improved flue gas denitrification efficiency, reduced operating costs, and achieved a nitrogen oxide concentration of less than 60 mg/m3, meeting emission standards. It also reduced catalyst usage and ammonia slip.

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Abstract

The invention discloses a method and a system for reducing the concentration of oxynitride in flue gas of a glass kiln. The system comprises a urea injection unit, a smoke exhaust unit and a control unit, the smoke exhaust unit comprises a first flue and a second flue, the first flue is vertically arranged, and the second flue is horizontally arranged and provided with a catalyst module; the urea spraying unit comprises a urea container, a urea pump and a urea spraying gun which are sequentially connected through a pipeline, and a gun body of the urea spraying gun is vertically arranged in the first flue; the urea spraying unit further comprises a first adjusting valve, and the first adjusting valve is arranged between the urea spraying gun and the urea pump. SNCR (selective non-catalytic reduction) and SCR (selective catalytic reduction) are combined, urea only needs to be sprayed in the vertical first flue to be decomposed into ammonia gas at high temperature to react with NOx, the rest ammonia gas can continue to be subjected to SCR reaction in the second flue, ammonia liquid does not need to be additionally supplemented, ammonia escape can be reduced, the urea utilization rate is increased, the content of nitric oxide in flue gas can be reduced to 60 mg / m < 3 > or below, and the SCR effect is improved. And the required emission standard is reached.
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