SCR Denitrification Reactor

Overview

The SCR denitrification reactor is a device used to reduce nitrogen oxide (NOx) emissions from flue gas, achieving high-efficiency denitrification through Selective Catalytic Reduction (SCR) technology. SCR technology utilizes a catalyst to facilitate the reaction between a reducing agent (typically ammonia) and NOx in the flue gas in the presence of oxygen, producing harmless nitrogen and water, thereby reducing NOx emissions. This technology offers advantages such as no by-products, no secondary pollution, simple device structure, high removal efficiency (up to 90% or more), reliable operation, and ease of maintenance.

The SCR denitrification reactor mainly consists of the reactor body, steel support and stair platform, soot blowing system, and internal flow distribution device. The reactor cross-section is reasonably designed based on the flue gas volume to ensure optimal flue gas velocity, thereby guaranteeing reaction efficiency. The reactor generally has a multi-layer structure, divided into an initial catalyst layer and a reserved layer.

Working Mechanism

Ammonia gas, as the denitrification agent, is injected into the high-temperature flue gas denitrification device, where, under the action of the catalyst, NOx in the flue gas is decomposed into N₂ and H₂O. The reaction formulas are as follows:
(1) Main reactions

NO+NO₂+2NH₃→2N₂+3H₂O
4NO+4NH₃+O₂→4N₂+6H₂O
2NO₂+4NH₃+O₂→3N₂+6H₂O

(2) Side reaction

2SO₂O₂→2SO₃

Gas Flow Rate

10,000 ~ 3,000,000 m³/h, with outlet emission concentration as low as 5 mg/Nm³

Applicable Industries

Flue gas from boilers and kilns in industries such as power, metallurgy, building materials, light industry, chemical, steel, and coking.

Features of SCR Denitrification Reactor

1. High denitrification efficiency: SCR technology achieves high-efficiency nitrogen oxide removal, with denitrification efficiency reaching over 90%, and even stably exceeding 95%.
2. Good stability: The design and operation of SCR denitrification equipment are relatively stable, maintaining high denitrification performance over the long term. Through reasonable control parameters and optimized operation methods, catalyst deactivation and equipment failure rates can be reduced, improving equipment reliability and service life.
3. Strong adaptability: SCR denitrification equipment has relatively low requirements for fuel type and combustion conditions. Whether using coal, oil, natural gas, or other fuels, as well as different combustion temperatures, pressures, and other conditions, SCR technology can be applied for denitrification treatment. This enables SCR denitrification equipment to be widely used across various industrial and energy sectors.
4. Environmentally friendly with no secondary pollution: SCR denitrification technology uses a reducing agent to convert NOx into non-toxic N₂ and H₂O, and the entire process does not generate secondary pollution.

SCR Denitrification Reactor Technical Parameters (Partial)