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SCR(Selective Catalytic Reduction)

SCR (Selective Catalytic Reduction) is a device that efficiently removes nitrogen oxides (NOx) from flue gas. The core of this technology is to convert NOx into harmless N₂ and H₂O using ammonia or urea as a reducing agent under the action of a catalyst.

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Waste water treatment VOC Concentrator Waste Gas Treatment Chemical reactor Fine Chemical EPC

Technical Parameters

Working Principle

Product Advantage

Application

FAQ

Working Principle

The SCR method denitrification system is mainly composed of SCR catalytic reactor, ammonia injection system, flue gas bypass system, ammonia storage and preparation system, etc.Liquid ammonia is vaporized by the evaporator and then enters the SCR system. The vaporized ammonia is mixed with the dilution air and sprayed into the upstream flue gas through the ammonia spray grid. The fully mixed reducing agent and flue gas react in the catalyst layer, ultimately achieving the purpose of removing NOx.

Product Features

The denitrification efficiency can usually reach 80% - 95%, and can even exceed 90% in some optimized systems.

High treatment efficiency
The device integrates dust removal and denitrification functions, saving space and reducing system resistance. The device adopts a multi-layer catalyst design to support rapid replacement and maintenance.

Integrated design
The equipment monitors NOx concentration, temperature and flue gas flow in real time through the automated system, dynamically adjusts the injection amount of ammonia/urea, and ensures the stability of denitrification efficiency.

Automated control
The equipment is compatible with coal, gas, oil and other fuels, and can operate at low temperatures (150℃ – 450℃), suitable for working conditions that cannot meet the requirements of high-temperature denitrification.

Wide adaptability
The system has low energy consumption and low operating and maintenance costs. Combined with intelligent control technology, it can further optimize the amount of reducing agent and reduce operating costs.

Economic and energy-saving

Application

Power industry

Coal-fired power plants, gas-fired power plants, biomass power plants, etc.

Iron and steel industry

Sintering machines, pellet production lines, coke ovens, blast furnaces, etc.

Cement industry

Used for cement kiln tail gas treatment.

Glass manufacturing industry

Used for glass melting furnace flue gas treatment.

Petrochemical industry

Refineries, petrochemical plants, fertilizer plants, etc.

Waste incineration

Used for waste incineration plant flue gas purification.

FAQs

Causes of catalyst deactivation

(1) Catalyst poisoning: heavy metals (such as As, Pb), alkali metals (such as Na, K, Ca) or sulfides in flue gas will cover the active sites of the catalyst, which leads to a decrease in catalytic efficiency;
(2) Catalyst blockage: ammonium salts (such as ammonium sulfate) may crystallize in the catalyst pores at low temperatures, affecting the reaction;
(3) Catalyst aging: catalyst activity decreases after long-term use and needs to be replaced regularly.
How to optimize the soot blowing system and reduce the catalyst blockage rate

(1) Use sonic soot blower (suitable for loose soot);
(2) Use steam/compressed air soot blower (suitable for sticky soot);
(3) Control the flue gas temperature to avoid long-term low-temperature operation (ABS generation temperature: 150-280℃).
How to reduce ammonia escape

(1) Optimize ammonia injection operation: adjust the AIG valve opening to make NH₃/NOx evenly distributed;
(2) Intelligent control optimization: adopt feedforward + feedback control, and predict ammonia injection demand in combination with unit load; introduce AI algorithm to dynamically adjust ammonia injection amount to reduce lag effect; set a reasonable ammonia escape limit.

SCR(Selective Catalytic Reduction)

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