Cement News tagged under: SNCR

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SNCR: when the equation no longer holds

28 November 2023, Published under Cement News

There are plants where selective non-catalytic reduction (SNCR) does not achieve the expected DeNO X results for no apparent reason. Often a look at the chemical processes in the background provides a clue as to why successful denitrification is failing.  By Karin Koglbauer, DyCarnica, Austria. Figure 1: chemical DeNOx behaviour-ammonia vs urea (© DyCarnica) Selective non-catalytic reduction (SNCR) refers to selective flue gas denitrification without a catalyst at 800-1100˚C. G...


21 November 2022, Published under Cement News

While in some cases the choice between SCR and SNCR technology for NOx reduction appears straightforward, there is a middle way that enables the use of the less expensive option of SNCR technology. Lechler explains how cement producers can benefit from its high-efficiency SNCR technology.  By Dipl Ing Claus Fritze, Lechler, Germany. Figure 1: structure of the APC Process Proven technologies for the reduction of NO x emissions, in addition to primary measurements, are either the...

Beyond primary measures

25 July 2022, Published under Cement News

Under tightening emission legislation, it may be time to consider new technologies and products to remain in compliance. Denmark-based Umicore offers a variety of catalysts for the removal of NO x , NH 3 , dioxins, CO and various volatile organic compounds (VOCs). Globally several cement plants are today operating with a Umicore catalyst. This article presents selected case stories from some of the company’s catalyst installations in cement plants. By Anders Rooma Nielsen, Umicore, Denmark. ...

Injecting new life in NOx control

30 May 2018, Published under Cement News

The aqueous ammonia (NH 3 ) injection system for nitrogen oxide (NO x ) emission reductions at a cement plant in Florida, USA, provided limited ability for flow downturn and material usage efficiency. A new injection system, provided by Lechler, considerably lowered the use of NH 3   in its NO x reduction system. By Stewart McKenzie and Aly Gilbertsen, Lechler Inc, USA, and Daniel Ball, Argos Cement, USA. A new NH 3 injection system with the latest nozzle design by Lechler improved ...

Improving SNCR performance

21 December 2016, Published under Cement News

In recent years the reduction of nitrogen oxide (NOx) emissions in kiln lines has been an important topic which is expected to further gain prominence as central European emission limits are set to reduce to 200mg/Nm³ at the start of 2019. NH3 slip emission will also be limited to 30mg/Nm³. To meet these new limits, current SNCR technology will need to be reconsidered as a realistic NOx reduction degree is between 50-75 per cent depending on the kiln line design. By C Helmreich, MAL Umweltte...

NOx reduction at Vidal Ramos

05 December 2014, Published under Cement News

To lower NOx emissions Votorantim Cimentos decided to install SNCR equipment as well as implement alternative fuels (AF) use at its Vidal Ramos plant, Brazil. This required the optimisation of the urea injection system to ensure the lowest-possible consumption of the reducing agent before and after the introduction of the AFs. By Mario Henrique Interlenghi & Carlos Roberto Moreira da Cunha, Votorantim Cimentos, Brazil. Votorantim Cimentos’ greenfield Vidal Ramos plant in Brazil has op...