Overview

DyNOR™ is the answer to Europe’s tightened nitrogen oxide limits. Simple in design and easy to install, the non-catalytic DyNOR™ process closes the gap between the costly SCR process and the conventional SNCR process. It is an investment which pays off.

Your advantages:

• Low nitrogen oxide levels with minimal ammonia slip
  Successful deployment and application in several EfW plants has confirmed the functionality of DyNOR™ in full-scale, long-term trials.

• Cost reduction
  The precise and dynamic DyNOR™ process delivers the desired performance with significantly lower investment costs and energy consumption than the SCR process. Ammonia consumption is lower than in the conventional SNCR process thanks to precise temperature measurement and related injection.

More information about our DyNOR™ process can be found here.

Application

The DyNOR™ Process Offers Decisive Advantages

Harmful nitrogen oxides (NOx) are produced in every combustion process; however, they can be converted into their basic elements – nitrogen and water – through a so-called DeNOx process. Developed by HZ Inova engineers, DyNOR™ (dynamic NOx reduction) is an improved SNCR process that succeeds in doing what previously was only possible with a SCR process: it reduces nitrogen oxides to very low levels with minimised ammonia slip.

With DyNOR™, operators can leverage a moderate investment to benefit from the monetary incentives offered by various European countries.

With DyNOR™, the first pass of the steam generator is virtually divided into vertical segments. Each segment is equipped with a DyNOR™ module, which consists of a DyNOR™ distributor, four injection points (one per level), and two infrared pyrometers. As a rule, four modules are sufficient for medium-sized plants rated at about 40 MWth.

Precise Functionality

An accurately metered amount of reagent, based on NOx emission measurements, is injected via the DyNOR™ distributors. The distributors are independently controlled in response to temperature measurements in the respective segments. They ensure the split-second, continuous, spike-free switching across four levels in each segment and the suffcient cooling of the idle nozzles. In this way, the reagent is injected at the right location even in the event of temperature asymmetries.

The Answer to Europe’s Tightened Nitrogen Oxide Limits

Due to the independent segments and continuous level selection, the full potential of the SNCR process is tapped and nitrogen oxide limits are attained with minimal ammonia slip. The patent-pending DyNOR™ process thus fulfills the world’s strictest nitrogen oxide standards in a reliable and cost effective manner. Thanks to the simple installation concept, the process is ideal for both retrofits and for integration in new plants.

Efficiency Thanks to Precisely Interacting Systems

In the SNCR process, the reactant must be injected into the secondary combustion chamber within the optimised temperature range of 850 °C to 950 °C. Although modern combustion systems react to different waste qualities, it is impossible to prevent short-term temperature fluctuations and asymmetries entirely. The key advantage of DyNOR™ is that reagents are always injected at the precise right location.