Flue gas desulfurization and denitrification

The flue gas desulfurization and denitrification system is a flue gas purification technology widely applied in the chemical industry to control the formation of nitrogen oxides and sulfur oxides. The system employs a self-developed low-temperature, sulfur‑resistant denitrification catalyst, enabling a sequential process of denitrification followed by desulfurization. While achieving ultra‑low emissions of nitrogen oxides, sulfur dioxide, and particulate matter, it also efficiently recovers waste heat from coke oven flue gas, maximizes steam production, and resolves the issue of excessive ammonia slip. In the desulfurization stage, a CFB fluidized‑bed process is utilized, with hydrated lime as the desulfurizing agent, effectively reducing operating costs. The system features a simple process flow, minimal water consumption, and eliminates the need for flue gas cooling or reheating. Equipment exhibits virtually no corrosion, scaling, or wastewater discharge; it occupies a small footprint, saving space, requires low capital investment, and incurs modest operating expenses. With its high adaptability, the system is suitable for diverse operating conditions and can be customized to optimize performance based on specific customer requirements, helping coking enterprises achieve ultra‑low emissions and green production.

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Product Description

Technological Advantages

Technological Innovation: A low-temperature, sulfur‑resistant denitrification catalyst has been developed, enabling a process that first removes nitrogen oxides and then desulfurizes, thereby fully recovering waste heat from coke oven flue gas. Steam production has been maximized, effectively addressing the issue of excessive ammonia slip. Furthermore, the conventional CFB fluidized‑bed desulfurization process has been improved by adopting hydrated lime as the desulfurizing agent, significantly reducing operating costs and resolving the problem of high expenses associated with coke oven flue gas desulfurization and denitrification.

Key technologies: Low-temperature sulfur-resistant denitrification catalyst.

Key equipment: CFB desulfurization fluidized bed.

Product Information	Low-temperature denitrification catalyst	Sulfur-resistant denitrification catalyst
Photo
Catalyst type	Rare earth/honeycomb type	Rare earth/honeycomb type
Denitrification efficiency	98%	98%
Operating temperature	>170℃	>200℃
Sulfur dioxide content requirements in flue gas	<30mg/Nm ³	<1000mg/Nm ³
Features	Large surface area, high activity, and compact catalytic volume; the amount of active catalytic material is 10–20% greater than in other types.	It exhibits strong resistance to sulfur, dust, and water; the catalyst operates stably with a long service life.
Scope of Application	Suitable for low-temperature, low-sulfur applications; widely used in steel sintering and pelletizing, coking, biomass combustion, waste incineration, nonferrous metals, cement, glass, petrochemicals, and more.	It is suitable for medium- and low-temperature applications and for medium-to-high sulfur conditions, and is widely used in denitrification‑followed‑desulfurization processes across industries such as coking, cement, glass, and petrochemicals.

Product Description

Process Recommendation

Comprehensive Treatment of Sulfur and Nitrogen Oxide Removal from Coke Oven Flue Gas

Process Route Recommendation: Medium- and low-temperature SCR denitrification + waste heat recovery + CFB desulfurization + baghouse dust removal + induced draft fan + stack emissions.
Process characteristics:

(1) Post‑combustion desulfurization can enhance ammonia slip absorption, ensuring stable compliance with environmental emission standards.

(2) There are more options for selecting desulfurization methods.

(3) Maximum steam output.

(4) The baghouse operates at a lower temperature, resulting in reduced bag replacement costs.

(5) Lower operating costs.

Integrated Flue Gas Desulfurization and Denitrification for Sintering/Pelletizing Processes

Process Route Recommendation: CFB desulfurization + baghouse dust collection + GGH (cold end) + internal combustion furnace + low-temperature SCR denitrification + GGH (hot end) + induced draft fan + stack emissions.

Process characteristics:

(1) Low operating costs.

(2) No wastewater is discharged.

(3) All reactions are conducted above the dew point temperature to prevent dew-point corrosion.

(4) The system is simple and easy to operate and maintain.

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Flue gas desulfurization and denitrification

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Jiangsu Longye Energy‑Saving Technology Co., Ltd. is a comprehensive energy‑saving and emission‑reduction service provider that integrates R&D, design, manufacturing, engineering general contracting, and operation‑and‑maintenance services.

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Jiangsu Longye Energy-Saving Technology Co., Ltd.

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Email:longyetech@jslyjn.com

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