H+H SCR Technology for lower NOx emissions

Environmentally-friendly, efficient, long-lasting


Engine and non-engine combustion processes in stationary and industrial applications are subject to strict legal guidelines, just as
44. BImSchV (Regulation on medium combustion plants, gas turbines and combustion engines plants) and DIRECTIVE (EU) 2015/2193
(on the limitation of emissions of certain pollutants into the air from medium combustion plants), demanding the implementation of efficient
measures to reduce emissions while maintaining the best possible levels of performance. A challenge that H+H successfully masters with
its plant technology. Our exhaust gas treatment plants enable the achievement of nitrogen oxide reduction rates > 95 %. Engines
operated in this manner undershoot pertinent limits to a considerable degree.

» Overview of current emission limits and laws in Europe


More than 30 years of experience

Consulting and Planning

Benefit from more than 30 years of experience with DENOx plant engineering.  Our team is very
pleased to support you with the planning of your exhaust treatment system and designs a tailor-
made concept according to your application. The modular design of our SCR systems facilitates
installation, only a minimum of cables and pipelines are required.

H+H also provides the exactly dimensioned accessory components such as,
for example, reducing agent tanks, compressed air stations or exhaust gas analyzers.


100% made in Germany

High-Quality Components for rough
conditions and for a long life time

The use of the proven industry components, such as the equipment with robust sensors, guarantees
a long life time and reliable system performance. This ensures a long-term supply of spare parts.
This measure allows operation with low but sophisticated and preventive maintenance. 

Our service team will be at your disposal at any time with advice and assistance. 


Design & Manufacturing

Know-How and Service

SCR systems of H+H are programmed and further developed by our team. Due to the
know-how in programming, the diversity in the various areas of exhaust treatment system
is almost infinite.
Different reducing agents, different load curves or fuels, communication with
the power station control room – all technologies and requests can be considered and
implemented here. 

Should you require a reporting or recording of the performance data, our specially developed
software CaReCon (Catalyst Remote Control) can be of assistance. This feature allows us also
to provide remote maintenance access in order to carry out software updates or to support you
in case of interruptions. And all this without any waiting times or expensive travel costs!


Sustainability and Reliability

Continuous improvement process

Our experience, gained with more than 1000 SCR systems from over 30 years, will be integrated
in every new project. In addition, a continuous improvement process made with the development of
our service activities will also be implemented. 

We would like to win you as our customer and to achieve your satisfaction. If you place an
order for the second exhaust treatment system at H+H, then we will also be satisfied.

It is all about the optimal temperature 

Operating Temperatures

Our H+H SCR systems are suitable for operating temperatures
between 180 and 540°C. 
The catalyst must be operated at a minimum
temperature, however the maximum must not be exceeded. The
minimum temperature is a design criteria and an important parameter
for the NOx conversion. The lower the temperature, the more catalyst
is needed.

The operating temperature for combustion engines (MGO / MDO)
is at least 290-310°C up to a maximum of 540°C.

With non-engine combustion processes (biomass, glass furnace,
SNCR + SCR) as well as for industrial boilers the H+H SCR systems
require at least a temperature of 180°C up to a maximum of 540°C.

Global references speak for themselves

Our references

  • Industry

    Combustion Processes

    RTO in cooperation with Krantz

    Exhaust Mass Flow Rate:6.000 Nm³/h
    Emission Source:RTO Exhaust
    NOx out of catalyst:80 mg/Nm³
  • Industry

    Gas Turbine

    Spectra Energy Danville Compressor Station in cooperation with AeriNOx

    Engine Producer:General Electric
    Type:GE FRAME 3
    Power:44 MW
    Fuel:Natural Gas
    NOx Reduction:100 -> 25 ppm
  • Industry

    Combustion Engine

    Modernization CHP-Kapaunenstraße in cooperation with EAN

    Engine Producer:Jenbacher
    Power:2x 2679 kW
    Fuel:Natural Gas
    NOx Reduction:> 80%