Hebei Hanlan's SCR system for gas generators in a overseas project has passed customs acceptance

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Designed and manufactured by Hebei Hanlan, an SCR deNOx system for gas generator sets was installed and operated in a certain overseas region recently. The NOx emissions from the exhaust gas were reduced from 500 mg/Nm³ to ≤75 mg/Nm³ (provided by final user) and met the acceptance criteria successfully after installing Hanlan’s SCR system.

This project specifically targeted biogas engine exhaust treatment. Hanlan’s ACME® series deNOx system for gas generator set reduced NOx to nitrogen and water by adopting SCR technology which utilized urea solution as the reducing agent and high-performanced gas engine specific deNOx catalysts. With the experience of controlling emission of internal combustion engine for more than 20 years, not only considering about the characteristics of biogas engine exhaust deNOx work, but also the investment costs, operational safety, and other factors, Hanlan's technical team designed the customized deNOx system so that the emission standards can be met.

Considering about the exhaust gas temperatures corresponding to different engine loads, the project utilized high-temperature deNOx catalysts, each independent SCR deNOx system served one generator set. The scr system include:

Urea solution storage tank,

Main part of the SCR deNOx (mixing device, reactor housing, catalyst cube and module),

Dosing and injection unit (atomizing spray gun, spray gun sleeve),

Process pipe and valves,

Power distribution and control system.

Our SCR deNOx system features excellent sealing, robustness, and stability, ensuring a  long-term operation under exhaust gas temperatures not exceeding 600°C for at least 1 hour without any significant deformation. The system can ensure that the internal flue gas passes evenly through the catalyst surface with a good control of velocity, temperature and NH₃/NOx molar ratio. The catalyst modules are designed for easy replacement and  some incorporate measures are utilized to prevent vibration displacement caused by gas flow erosion.

This deNOx system adopted high-temperature SCR catalysts specifically designed for internal combustion engines. The catalysts feature uniform coating meeting local and international standards, both porosity rate and factory acceptance rate can reach 95%, which can ensure a longer service life. Additionally, the catalyst modules have standardized specifications for interchangeability and are securely packaged for ease of replacement, transportation, and installation.

The dosing and injection system within the gas generator set deNOx system atomizes the urea solution. It ensures high deNOx efficiency while controlling the ammonia slip rate precisely. The spray guns offer high resistance to thermal shock, heat deformation, wear-resistant, and corrosion by the reducing agent solution, and are designed for easy maintenance and replacement.

The control system for this SCR deNOx system is based on a PLC. Temperature and NOx sensors areequiped at both the reactor inlet and outlet. The system controls the urea injection volume based on the measured inlet and outlet NOx concentrations. It also features a human-machine interface (HMI) with functions for load calibration, fault diagnosis and troubleshooting, and alarm management. This enables remote monitoring and integration with the plant's main automation system.

Overall, this gas generator scr system features high purification efficiency (meeting environmental requirements for NOx ≤ 75mg/Nm³), safety and reliability, low backpressure (reducing the impact of the denitrification process on the internal combustion generator), optimal piping layout and installation location, a compact footprint, and easy maintenance and repair. As a result, after installation and commissioning, the system not only successfully met standards but also performed well, earning high customer recognition. If you also need exhaust purification for fuel or gas generators, please contact us; we can provide professional solutions for your generator exhaust purification. We hope our SCR systems provide better solutions and services for more users allover the world.