Reduce emissions

When it comes to reducing emissions and staying ahead of environmental regulations, FLSmidth can help you achieve compliance without limiting plant performance

Brevik case

SO2 emission control

Solutions for evaluating and reducing sulphur dioxide (SO2) emissions

SO2 Emission Control System


The World Bank and many countries are imposing increasingly tougher environmental restrictions on SO2 emission.

In cement plants, SO2 emissions are generated from sulfur compounds in the raw materials and, to a lesser extent, from sulfur in the fuel. It is therefore essential for cement producers to ensure that the kiln process is not compromised and that they remain in compliance with emission regulations.

A base-line emissions audit by FLSmidth includes:

  • on-site stack testing
  • process analysis and
  • raw material sampling

These results are analyzed by process specialists who provide a report that compares current emissions levels against current or future limits, identifies the sources of any emission problems, and recommends practical and economical solutions. 



FLSmidth offers several systems for reducing SO2 emissions depending on the reduction level:

Our D-SOx Cyclone system is a means of achieving SO2 emissions reduction in the range of 25-30% by taking advantage of the free lime that is created in the calciner.

Our Hydrated Lime Injection (HLI) system can reduce SO2 emission by up to 60% by injecting hydrated lime powder either pneumatically into the preheater or bypass system or via a mechanical feed into the preheater kiln feed.

Additionally, FLSmidth's gas suspension absorber, the FLS® GSA is a multi-pollutant control system that provides a high level of SO2 removal of up to 97%, depending on outlet temperature.

For higher removal, FLSmidth also provides third-party wet scrubber technology.

Read the case story
Brevik case