DeNOx Catalytic SNCR

Name: DeNOx Catalytic SNCR
Brand: MDSJ Process | DUCON

DeNOx Catalytic SNCR is a NOx-abatement solution designed to reduce nitrogen-oxide emissions through controlled reagent injection and the correct reaction window.

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DeNOx Catalytic SNCR

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DeNOx Catalytic SNCR

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SNCR Catalyst for DeNOx Systems

MDSJ 's SNCR DeNOx Systems work by injecting ammonia or urea into the radiant and convection regions of a boiler to treat the flue gases, so the reduction reaction can take place. The reagent comes in contact with the NOx in the flue gas within a specific temperature range. For urea, this range is approximately 800°C to 960°C For ammonia, the range is lower at 500°C to 800°C.

MDSJ 's SNCR system has low capital equipment cost, and is extremely versatile. It offers economic advantages over the SCR systems when combined with other technologies. MDSJ s SNCR technology can be used in many industries including power, steel, cement, petrochemical, waste to energy, glass and many others

SNCR Catalytic System

MDSJ provides the Selective Catalyst Reduction systems and has a sophisticated SCR honeycomb extrude technology that is proven in hundreds of installations for removal of NOx, CO and other VOCs, at power plants, cement plants, incinerators, glass furnaces, nitric acid plants and other industrial applications

Optimized SNCR Catalytic

MDSJ now offers the most advanced and optimized SCR catalyst modules that are based on ultrafine powder technology which controls the pore size, particle size and dispersion of active metal on carrier materials such as TiO2 and Al2 O3.MDSJ can provide high efficiency catalyst at a very low cost for your new project or replacement of existing catalyst. MDSJ provides complete inspection, engineering, removal and replacement services.

DeNOx Technologies: SNCR and SCR

SNCR (Selective Non-Catalytic Reduction) — reagent (urea or ammonia) is injected directly into the hot flue gas within a typical 850-1100°C temperature window; no catalyst is used.
SCR (Selective Catalytic Reduction) — the reagent reacts with the gas over a catalyst bed in a typical 250-400°C range; the highest removal is achieved here.
Core reaction: NOx is reduced to nitrogen (N2) and water vapor (H2O) by ammonia (NH3) or ammonia released from urea — the end products are harmless.
SNCR offers moderate removal with lower capital cost and simple equipment; SCR is preferred for strict emission limits requiring high efficiency.
Hybrid solutions combine SNCR pre-reduction with an SCR polishing stage to optimize catalyst volume and reagent consumption.

Technical Specifications and Operating Range

Removal efficiency: SNCR typically 30-60%, SCR typically 80-95% (90%+ achievable depending on application and catalyst volume).
Reaction temperature: 850-1100°C for SNCR (optimum ~900-1000°C), 250-400°C typical window for SCR.
Reagent: 25% ammonia solution, anhydrous ammonia, or 40-50% urea solution; molar ratio (NSR) typically 0.8-2.0.
Ammonia slip: typically targeted at < 5-10 mg/Nm³; slip is critical for reagent waste and downstream fouling.
Catalyst type: honeycomb or plate; usually V2O5-WO3 active phase on a TiO2 carrier.
Catalyst life: typically 3-5 years (varies with dust, sulfur, and poisoning heavy-metal load).

SNCR versus SCR Comparison

Efficiency: SNCR moderate (30-60%), SCR high (90%+) — SCR is required where legal limits are strict.
Temperature window: SNCR requires injection into a high-temperature zone (furnace/boiler); SCR uses a separate reactor at lower temperature.
Capital cost: SNCR low (no catalyst, simple injection); SCR high (catalyst bed + reactor housing).
Operating cost: SCR consumes less reagent but carries periodic catalyst replacement cost.
Space requirement: SNCR needs minimal equipment; SCR requires additional reactor volume and ductwork arrangement.
NH3 slip control: better controlled in SCR thanks to the catalyst; in SNCR it depends on dosing and temperature stability.

Industries Served

Power plants — flue-gas NOx control on coal, natural gas, and biomass boilers.
Cement industry — reducing rotary kiln (calciner) NOx emissions, frequently with SNCR.
Waste incineration (MSW, hazardous) — SNCR + SCR combination for strict emission limits.
Glass and ceramic furnaces — control of high-temperature (thermal) NOx formation.
Iron-steel and sinter plants — nitrogen oxide removal from process flue gas.
Chemical and petrochemical — NOx control on process heaters and furnaces.

Selection and Design Criteria

The flue-gas temperature profile determines whether the injection point falls in the correct temperature window — the wrong temperature lowers efficiency and increases slip.
The target emission limit (mg/Nm³) directly determines whether SNCR or SCR is required.
Dust, sulfur (SO2/SO3), and heavy-metal load affect the catalyst type, position (high-dust / low-dust / tail-end), and life.
Reagent choice (ammonia vs urea) should be evaluated for safety, storage, logistics, and dosing control.
Molar ratio (NSR) and mixing quality directly affect both efficiency and NH3 slip; injection-lance geometry matters for good mixing.

Why DUCON, Why MDSJ Process?

Designing, manufacturing, installing, and commissioning air pollution control systems under the DUCON brand in Turkey since 1986 — 40 years of continuous industrial project experience.
DeNOx (SNCR/SCR), wet scrubbers, jet pulse baghouse filters, and pneumatic conveying under one roof — an integrated emission-control line from a single supplier.
End-to-end project delivery from flue-gas measurement through reagent-dosing optimization to commissioning — not just equipment, but system integration and operator training too.
Direct trilingual engineering support (TR / EN / DE) — technical documentation in their own language for DACH and European customers operating in Turkey.
Field-validated DUCON reference designs across power, cement, waste incineration, and glass sectors.
Made in Turkey — short lead times, local service, and full regulatory compliance.

Frequently Asked Questions

What is DeNOx?

DeNOx is the general term for the emission-control technology used to reduce nitrogen oxides (NOx) in industrial flue gas. There are two main methods: non-catalytic SNCR and catalytic SCR. Both reduce NOx to harmless nitrogen (N2) and water vapor.

What is the difference between SNCR and SCR?

SNCR (non-catalytic) injects reagent directly into hot flue gas in the 850-1100°C range and typically achieves 30-60% removal. SCR operates over a catalyst at 250-400°C and reaches 90%+ efficiency. SCR offers higher efficiency, SNCR offers lower cost.

How much NOx does a DeNOx system remove?

SNCR typically removes 30-60% of NOx, while SCR typically removes 80-95% (90%+ depending on application and catalyst volume). Strict emission limits usually require SCR or a hybrid SNCR+SCR solution.

Which reagent is used in a DeNOx system?

The most common reagents are ammonia (25% solution or anhydrous ammonia) and urea (40-50% solution). Reagent choice depends on safety, storage, and logistics; both ultimately supply the ammonia that reduces NOx to nitrogen.

What is ammonia slip and why does it matter?

Ammonia slip is the unreacted ammonia that leaves with the flue gas. It matters for reagent waste, downstream equipment fouling, and secondary emissions; it is typically targeted to stay below 5-10 mg/Nm³.

At what temperature does SNCR operate?

SNCR typically operates within an 850-1100°C temperature window, with optimum efficiency usually in the 900-1000°C range. The reagent must therefore be injected into the correct temperature zone of the boiler or furnace; the wrong temperature lowers efficiency and increases slip.

What is the life of an SCR catalyst?

An SCR catalyst typically lasts 3-5 years. Its life depends on factors such as dust load, sulfur (SO2/SO3) content, and poisoning heavy metals. The catalyst usually consists of a V2O5-WO3 active phase on a TiO2 carrier.

Is there a DeNOx system manufacturer in Turkey?

Yes, MDSJ Process designs, manufactures, installs, and commissions SNCR and SCR DeNOx systems in Turkey under the DUCON brand. It has been active in air pollution control systems since 1986.

Which industries use DeNOx systems?

Power plants, cement plants, waste incineration facilities, glass and ceramic furnaces, iron-steel/sinter plants, and chemical-petrochemical process heaters are the main application areas. SNCR, SCR, or a hybrid solution is selected based on the industry and emission limit.

Quick Info

Typical NOx removal of 30-60% with SNCR and 90%+ with SCR

Catalytic (SCR) and non-catalytic (SNCR) reduction architectures from one supplier

Ammonia/urea reagent dosing and NH3 slip control are optimized together

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