Engineering

The proper design of critical equipment such as the ammonia injection and mixing system and reactor internals and systems for ammonia injection and mixing is essential to achieve the optimum performance of the DeNOx system.

Topsoe has developed a number of technologies for the SCR DeNOx process, aiming at improving the overall process efficiency and to provide innovative solutions for our clients.

Flow modelling

Optimum design of an SCR DeNOx system is important to ensure a low emission level. Sophisticated flow-model studies provide a solid basis for the reactor layout and for design of mixers, guide-vanes, rectifiers etc. Flow modelling of the system can be carried out by Computational Fluid Dynamics (CFD) simulations or in a physical scale model.

Ammonia injection

Injection of the ammonia source into the flue gas often takes place either through a grid of nozzles or via a number of lances e.g. combined with a STARMIXER^® system placed in the reactor inlet duct. High system requirements call for a high degree of uniformity of the ammonia-mixed flue gas. Topsoe provides proper matching of ammonia injection design and system requirements, a key to the most efficient SCR DeNOx system.

STARMIXER®

A homogeneous distribution of ammonia in the flue gas is of crucial importance to achieve efficient NOx conversion and to minimise slip of unreacted ammonia. Topsoe has developed a proprietary mixing system - the STARMIXER® - consisting of a set of vortex-creating discs in a unique shape to be inserted in the flue gas duct. The optimised design provides a high degree of homogeneity with a minimum pressure drop.

Reactor design

Topsoe offers to provide basic engineering of the SCR DeNOx reactor. This includes process flow diagrams, control logics, piping and instrumentation diagrams and drawings of the catalyst arrangement and sealing system.

Design review

Topsoe offers to perform review of clients’ design and drawings to ensure the overall process and performance efficiency.