Structural Principles and Application Scenarios of Denitrification Flue Ducts

Category: Company News

Time: 2025-02-19

The design principle of the denitrification flue is primarily to provide optimal conditions for the denitrification reaction. By adopting a well‑designed flue configuration, the flue gas is guided at an appropriate velocity and flows uniformly through the denitrification unit, ensuring thorough contact and mixing between the denitrifying agent and the flue gas, thereby enhancing denitrification efficiency.

The denitrification flue is a conduit used in the denitrification process to convey flue gas. The following provides an overview of its features and applications:

Structure and Principle

Structure: The denitrification flue typically consists of pipes made from various materials, including horizontal and vertical sections. To ensure uniform flue gas flow and optimize denitrification performance, special structural features are incorporated, such as mixers installed within the vertical flue. These mixers comprise multiple pairs of first and second flue‑gas discharge sections arranged alternately along the horizontal direction; each section is equipped with several evenly spaced discharge ports, whose outlets are oriented at a specific tilt angle, enabling the flue gas to achieve uniform mixing throughout the flue.

Principle: The design of the denitrification flue gas duct is primarily aimed at providing optimal conditions for the denitrification reaction. By adopting a well‑designed duct configuration, the flue gas is guided to flow through the denitrification unit at an appropriate velocity and with uniform distribution, ensuring thorough contact and mixing between the denitrifying agent and the flue gas, thereby enhancing denitrification efficiency. For example, in the selective catalytic reduction (SCR) process, the flue gas—after passing through the economizer—is directed into the SCR reactor. As it flows through the duct, the flue gas reacts with injected ammonia under the action of the catalyst, reducing nitrogen oxides into environmentally benign nitrogen and water.

Application scenarios

Thermal power plants are one of the primary application sites for denitrification flue gas ducts. In these plants, large quantities of coal are burned, generating flue gases containing nitrogen oxides. These gases are conveyed through denitrification flue gas ducts to denitrification units for treatment, ensuring compliance with environmental emission standards. For example, many large coal-fired power stations employ SCR denitrification systems, in which the flue gas exiting the economizer is routed into the SCR unit; after undergoing denitrification, the treated flue gas is then discharged into the chimney.

Steel plant: During steel production, equipment such as coke ovens and sintering machines generates flue gas containing nitrogen oxides. The denitrification flue duct is used to convey this flue gas to denitrification units for treatment, thereby reducing nitrogen oxide emissions and protecting the environment. For example, the Hanbao Coking Plant of Handan Iron and Steel Group employs an SDA (semi‑dry desulfurization) plus SCR denitrification process, in which the denitrification flue duct plays a critical role in connecting the various treatment stages and transporting the flue gas.

Cement Plant: During cement production, kilns emit large volumes of flue gas containing nitrogen oxides. The denitrification duct conveys this flue gas to the denitrification system, where nitrogen oxide emissions are reduced through a denitrification process to meet environmental regulations.

Keywords: Structural Principles and Application Scenarios of Denitrification Flue Ducts

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