H+H Engineering & Services
Today HuHES is providing global support for more than 100 ships and, consequently, over 400 engines. Having almost 30 years of experience in this highly specialized field of business, the team around HuHES Managing Directors Dipl. Ing. Hartmut Ritter and Jürgen Müller has established a network of worldwide partners, thus providing fast and efficient service throughout the whole world.
H+H Engineering & Services meets every challenge and delivers innovative and energy-efficient NOx-reduction solutions for your application.
SCR, catalyst and NOx treatment technology
SCR = Selective Catalytic Reduction
The SCR method is intended to control the NOx emissions by means of a selective catalytic reduction. This is the most common method for removal of NOx in combustion engines and non-engine combustion processes (biomass, glass furnace, SNCR-SCR combination, industrial boilers).
This is injected in the exhaust gas where it evaporates and releases NH3 – ammonia. On the SCR catalyst surface the reduction occurs and converts the NOx to harmless N2 which is inert and a natural component of the air. The equally harmless H2O is a by-product.
For which temperature range are the H+H SCR systems suitable?
Our H+H SCR systems are suitable for operating temperatures between 180 and 540°C.The catalytic converter must be operated at a minimum temperature, but must not exceed the maximum. While the minimum temperature depends on the sulfur content, the maximum temperature is based on the thermal limit of the catalyst. 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 (gas / diesel / heavy oil) is at least 260-320°C and at most 540°C.
The H+H SCR systems require at least 180° C for non-engine combustion processes (biomass, glass furnace, SNCR-SCR combination, industrial boilers).
