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SCR
Selective Catalytic Reduction System
Selective Catalytic Reduction (SCR) / De-NOx

NH3 slip control in De-NOx 

Gases like N2O can cause significant long-term environmental affects. Considering an over 100-year period, it has 310 times more impact 'per unit weight' (Global warming potential) than carbon dioxide according to the United States Environmental Protection Agency (EPA).

Selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) technologies for NOx (Oxides of Nitrogen, NO +NO2) controls have become the most popular means of NOx reduction worldwide. From large coal-fired power plants and container ships to small four-cylinder cars, these technologies are now used worldwide.

 

In these processes, ammonia is used as a reagent to reduce the NOx emissions. By-products from these technologies can include ammonia. This is a classic case of measure and counter-measure where an effective pollutant control strategy needs to be multi-dimensional and take into account operator capabilities to ensure the control strategy does not create a greater problem in the long run. Multi-pollutant control strategies can diminish some of these harmful byproducts, however only effective real time measurements and automated controls can ensure long term reliability, thereby making the LGD F200 an invaluable tool for controlling this process effectively.

 

Read our application note: Reducing NOx Emissions


LGD - 选择性催化还原法
Laser Gas Detection in Industrial Applications

Industrial SCR, De-NOx

In power generation, NOx can be reduced by up to 99 percent with SCR where NH3 (or aqueous urea) is injected into the exhaust gas stream to react with NOx on the surface of a catalyst to form nitrogen and water. During this process, ammonia slip can occur, which either needs monitoring during operation or for system design and testing.

SCR System integrators worldwide have designed and implemented ammonia measurement systems based on the LGD F200 in various industries, including:

  • Coal-fired power plants
  • Natural gas-fired power plants
  • Chemical plants

 

Advantages:

- Hot-gas measurement up to 220°C

- Compensated for high moisture

- High NH3 selectivity

- Low ppm-level detectivity

Axetris LGD Process Control: Selective Catalytic Reduction SCR 选择性催化还原反应 (SCR) / De-NOx
Laser Gas Detection in Industrial Applications

Marine SCR, De-NOx

The shipping sector is a considerable contributor to global emissions of nitrogen oxides (NOx). Stricter regulations by the International Maritime Organisation (IMO) in the 2008 Amendments to MARPOL Annex VI, apply globally from 2016. All new ships sailing within an Emission Control Area (ECA) must reduce NOx emissions to meet the strict Tier III requirements.

 

SCR is becoming a widely-accepted technology to meet the Tier III requirements for NOx emission limits, and can be used with marine engines using various standard fuel types.

 

The Axetris LGD F200 offers a unique product which can be designed into marine SCR systems for continuous measurement of ammonia slip as a process conformity verification to protect the catalyst, while increasing the overall efficiency and ensuring safety of onboard personnel. Portable ammonia monitoring test equipment can be a powerful tool for spot checks and process optimization (engine mapping) for the equipment manufactures.

 

Advantages:

- Hot-gas measurement up to 220°C

- Compensated for high moisture

- High NH3 selectivity

- Low ppm-level detectivity

Axetris LGD Process Control: Selective Catalytic Reduction SCR 选择性催化还原反应 (SCR) / De-NOx
Laser Gas Detection in Industrial Applications

Automotive SCR Test Stations

Most major automotive OEMs today offer SCR systems as a standard feature to achieve international norms for automotive exhaust pollution. The widespread adoption of the SCR technology by the automotive industry has spurred a lot of research activity to further improve existing systems, or to develop new solutions.

 

Automotive SCR test equipment manufacturers worldwide trust the Axetris LGD F200 for their ammonia monitoring needs.

 

Advantages:

- Compensated for high moisture

- High NH3 selectivity

- Linearity over a large measuring range

- Low ppm-level detectivity

LGD 表面处理(钢的氮化处理)
Laser Gas Detection in Industrial Applications

Surface treatment—nitrogen hardening 

Surface hardening, treatment of steel by heat or mechanical means to increase the hardness of the outer surface while the core remains relatively soft. In Carburizing or Carbonitriding the donor is a nitrogen rich gas, usually ammonia (NH3), which is why it is sometimes known as ammonia nitriding. When ammonia comes into contact with the heated work piece it disassociates into nitrogen and hydrogen. The nitrogen then diffuses onto the surface of the material creating a nitride layer.

 

This process has existed for nearly a century, though only in the last few decades there has been a concentrated effort to investigate the thermodynamics and kinetics involved. Recent developments have led to a process that can be accurately controlled. The thickness and phase constitution of the resulting nitriding layers can be selected and the process optimized for the particular properties required. The Axetris LGD F200 Sensor OEM Module with its large linear measuring range from 0–5000 ppm represents a reliable measuring solution for this application achieving a good control of the layer properties and thickness.

 

Axetris LGD advantages:

- Linearity over a large measuring range

- High selectivity

- High stability

- Continuous sensor status monitoring

农业控制监测
Laser Gas Detection in Industrial Applications

Agriculture—Poultry/Livestock control

Livestock production is a major contributor to ammonia (NH3) emissions that present a serious health & safety hazard for the personnel, the animals and the environment in general. Because of its role in acidification, eutrophication and ground-level ozone generation, ammonia emissions need to be reduced within the framework of the EU Directive on National Emission Ceilings (NEC Directive). Increasingly farmers are required to install ammonia scrubbers in livestock operations to reduce NH3 emissions. Additionally, ventilation control needs to be optimized in order to reduce exposure of animals to NH3.

Axetris’ LGD presents an excellent solution for this measurement challenge because it provides a contact-less measurement, and—unlike electrochemical detectors—does not degrade over time. It thus enables continuous, low ppm-range NH3 measurements and can be used for effective ventilation control and scrubbing installation management to reduce health threats and odor nuisance from air discharged from stables.

Axetris LGD advantages:

- Low ppm-level detectivity (NH3)

- Linearity over a large measuring range

- High selectivity

- High stability

 

Read our Success Story: Innovative Solutions for Livestock Monitoring Using Axetris LGD F200—Integrated by Harper Adams University.

 

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