CINAR

Unveiling the “invisible” AFR co-processing limitations

Most cement plants have limitations in terms of co-processing due to flow stratification leading to lower fuel burnout/calcination, high CO/NOx and build-ups. The identification of flow stratification is extremely difficult and requires elaborate in-flame and 3-D mapping of the temperature and major gas species to quantify the air-fuel mixing pattern and mixedness levels. In this paper, a mineral interactive computational fluid dynamics (MI-CFD) model encompassing combustion and mineral interactions is used to visualise intricacies of calciner internal aerodynamics and its effect on meal calcination levels and fuel burnout. Modelling results provide a cost-effective way to reduce flow stratification, which leads to the implementation of low-cost solutions.

1 Introduction

The use of alternative fuels and raw materials have become an undeniable reality in the cement industry worldwide, motivated by ever increasing fuel costs as well as environment-efficient solutions. Under the name “co-processing”, the use of these unconventional materials in the cement manufacturing process with the purpose of energy and/or resource recovery combine the safe disposal of these residues with economic savings of the reduction in the use of conventional fuels and raw materials through substitution. The alternative fuels therefore are regularly “co-processed”, but not...

Related articles:

Issue 09/2013

A TEC supplies calciner upgrade

In June 2013, the Austrian A TEC was awarded an order for the implementation of a calciner upgrade with engineering, supply of equipment, steel structure, erection and civil works at Buzzi Cement...

more
Issue 12/2017 WO 2017/178254 A1

Process and plant for manufacturing cement in the oxyfuel mode

(22) 31.03.2017 (43) 19.10.2017 (57) Process for operating a cement or lime plant comprising a cement (1, 11) or lime kiln (21, 31) and a calciner (2, 12), wherein heat is generated by combustion of...

more
Issue 5/2019 US 2019/0071351 A1

Process and plant for manufacturing cement in the oxyfuel mode

(22) 31.03.2017 (43) 07.03.2019 (57) Process for operating a cement or lime plant comprising a cement or lime kiln and a calciner, wherein heat is generated by combustion of a fuel in the kiln and/or...

more
Issue 6/2019 PL3231779 (T3)

Process and plant for manufacturing cement in the oxyfuel mode

(22) 15.04.2016 (43) 29.03.2019 (57) Summary of the corresponding patent EP3231779 (A1): Process for operating a cement or lime plant comprising a cement (1, 11) or lime kiln (21, 31) and a calciner...

more
Issue 4/2016 US 2016/0046525 A1

Plant for producing cement clinker with gasification reactor for difficult fuels

(22) 04.04.2014 (43) 18.02.2016 (57) A plant for producing cement clinker, comprising as viewed in the direction of materials flow, a heat exchanger to preheat raw meal, a downstream calciner to...

more