Stationary SCR System

Stationary SCR System can be applied to a variety of land-based scenarios, such as power plants, furnaces, cogeneration and other post-combustion treatment. It is suitable for diesel, heavy oil, biofuel and gas fuel engines. Through configuration and combination, it can handle a variety of pollutants and reduce nitrogen oxide emissions by more than 98%.

1. Control System:

Monitor and adjust system operating parameters, such as temperature, pressure, flow and supply of reducing agent, to optimize denitrification effect.

Open-loop system: SEP/SNV, Close-loop system: SNQ

● Temperature sensor TEA

Measurement range: up to 600℃

Signal output: 4-20 mA

 

● Differential pressure transmitter PEA

Measurement range: 0-100 mbar

Signal output: 4-20 mA

 

● NOx sensor

Measurement range: 0-1500 ppm

Temperature: max 620℃

 

● Temperature switch UT

Signal sent to Engine control when temperature limit reached

2,Catalyst & Converter

Reaction chamber: The place where the flue gas comes into contact with the reducing agent, usually a vertical or horizontal pipe with a catalyst inside.

SCR catalyst: A substance used to promote the NOx reduction reaction, usually a metal oxide or a composite material of metal oxide and other elements.

The main reaction principle of SCR catalyst denitrification:

Urea solution passes through the mixing tube, and the ammonia produced by thermal decomposition/hydrolysis is fully mixed with the exhaust gas of the unit and enters the reactor equipped with catalyst for chemical reaction to generate nitrogen and water vapor. The effective NO_x conversion rate can reach 98%.

Urea hydrolysis: CO(NH₂)₂ + H₂O = NH₂CO₂NH₄=2NH₃ + CO₂

Urea Pyrolysis: CO(NH₂)₂=NH₃+HNCO, 8HNCO+6NO₂=8CO₂+4H₂O+7N₂

> Fast chemical reaction： 2NO+2NO₂+4NH₃= 4N₂+6H₂O

> Slow chemical reactions： 8NH₃ + 6NO₂ = 7N₂ + 12H₂O

SCR catalyst: TiO₂ matrix

● Large surface area

● Strong interaction with active ingredients

WO₃ promoter

● Enhance thermal stability

● Strong acidity promotes NH₃ adsorption

V₂O₅ active ingredient

● Uniform distribution of VOx

● Redox cycle (V4+ - V5+)

● Loading 1 - 3 wt% V₂O₅

Active:

3. Dosing System

4,Media Supply

Air supply air supply system: Air compressor CA air compressor, Air valve kit DRV air valve group.

If the customer provides compressed air, we provide air valve group; if there is no compressed air available, we provide air compressor integrated in SEP.

Reactant supply: Responsible for delivering reductant to the reactor to ensure sufficient reductant to fully react with NOx. 40% mass concentration, 32.5% urea solution is optional. Urea consumption is related to the removal effect and debugging situation.

SEP system dedicated VPH urea pump, maximum flow rate 14L/h

Standard VNR urea pump, maximum flow rate 95/125/190L/h

Large capacity urea pump, maximum flow rate 10,000 L/h

Stationary SCR System has a rich product series, including highly integrated systems, open-loop control systems and closed-loop control systems. With modular design concepts, catalysts, reaction chambers, injection systems and control systems can all be adapted to different power ranges. The closed-loop control system uses proprietary built-in detection technology to achieve high-precision denitrification control, long maintenance cycles, and low failure rates to optimize operating costs.

Jinan Jingheng Machinery Equipment Co., Ltd. is a high-tech sales and service company specializing in the design, installation and operation and maintenance of generator sets and supporting exhaust denitrification projects. It provides customers with comprehensive solutions such as gas comprehensive utilization system, combined heat and power system (CHP), sewage treatment system, and exhaust gas post-treatment. In order to meet customers' diversified needs such as power, economy, and environmental protection, the company is actively exploring Stationary SCR System solutions for agricultural combined heat and power application scenarios such as greenhouses, glass houses, and greenhouses.

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