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NO_x abatement in the cement industry

thyssenkrupp Industrial Solutions

SCR NO_x abatement at SPZ, Solnhofen/Germany

thyssenkrupp Industrial Solutions

OneStone Research

1 Development of NO_x emission levels

OneStone Research

2 NO_x emissions by selected leading cement producers

OneStone Research

3 NO_x levels of different abatement technologies

OneStone Research

A Tec Greco

4 Example of a multi-channel low NO_x-Burner

A Tec Greco

Fives FCB

5 Low-NO_x precalciner in a cement plant of Holcim, Mexico

Fives FCB

OneStone Research

6 Secondary NO_x abatement systems in the EU28

OneStone Research

[4]

7 Typical arrangement of an SCNR system [4]

[4]

FLSmidth

8 SNCR injection lances on FLS-calciner

FLSmidth

Caldyn Apparatebau

9 Tank installation for ammonia solutions

Caldyn Apparatebau

[2]

10 Typical arrangement for an SCR system [2]

[2]

11 Performance results of an SCR system [2]

[2]

thyssenkrupp Industrial Solutions

12 SCR system at cement work Monselice/Italy

thyssenkrupp Industrial Solutions

Scheuch

13 High-Dust-SCR system in a cement plant (HeidelbergCement Geseke) in Germany

Scheuch

14 Deconox system in a cement plant (Schwenk Zement Allmendingen) in Germany

Scheuch

OneStone Research

15 NO_x abatement costs

OneStone Research

The cement industry is getting cleaner, a fact which also applies to NO_x emissions. In the last 20 years, primary and secondary NO_x abatement technologies have been developed. A combination of these technologies, including selective catalytic and non-catalytic reduction technologies, have become state-of-the-art. This review gives an introduction into what technologies are being used, what emission levels can be achieved and what the installation and operating costs are.

1 Introduction

Cement plants around the world are facing tougher environmental regulations, such as the air emission levels for particulate matter, SO₂, NO_x, HCl, HF, mercury, TOC, dioxins etc. Nitrogen oxides (generically termed NO_x) are highly reactive gases, which are formed when fuel is burned at high temperatures. They contribute to global warming, water quality deterioration and acid rain. Elevated levels of nitrogen dioxide can cause damage to the human respiratory tract and increase a person’s vulnerability to, and the severity of, respiratory infections and asthma. Long-term exposure...