Limestone powder CO₂ scrubber – artificial limestone weathering for reduction of flue gas CO₂ emissions

1 Solution weathering of limestone

2 Lime/carbonic acid equilibrium

3 Schematic view of the laboratory test apparatus

4 Influence of temperature and scrubbing
suspension

5 Influence of ion concentration on reaction
rate at 10 °C

6 Influence of sample concentration for various samples and temperatures

7 Increase in removal efficiency at 20 °C when
CO₂ concentration in the flue gas is increased

8 Influence of gas content on reaction rate

9 Diagram of the pilotscale plant

10 Comparison of the conductivities of the
scrubbing solutions used in the laboratory
experiments and the pilot-plant tests

11 CO₂ absorption of scrubbing solutions in
tests performed with closed gas and open
scrubbing-fluid circuits (evaluation of the third
sample downstream of the final absorber in each case)

12 CO₂absorption of the scrubbing fluid
downstream the first, second or final absorption
stage in Test 9 using lime-based scrubbing fluid and a CO₂ concentration of 15 %vol. in the flue gas

13 Removal rates achieved in practical tests using salt-doped mains water

Table 1 Analytical data for the scrubbing water in the
practical tests

Table 2 Comparative assessment of MEA
scrubbing against the limestone-CO₂ scrubbing
process

Slowing down climate change is one of the most important challenges of our age. Exceptional importance attaches in this context to reducing greenhouse-gas emissions, and those of carbon dioxide (CO₂), in particular. Artificial limestone weathering opens up new perspectives in the reduction of CO₂ emissions.

1 Introduction

Various technologies for the removal of CO₂ from the flue gas produced in combustion processes have been researched and tested in trial and pilot facilities in the past already. All of these “post-combustion” processes have in common the fact that they generally utilise...

TEXT Dr. Sonja Haas, Norbert Weber, German Lime and Mortar Research Foundation, Cologne, Andrew Berry, Egon Erich, IUTA – Institute of Energy and Environmental Technology, Duisburg

Issue 11/2019 RESEARCH INSTITUTE LIME AND MORTAR | IUTA E.V.| ICBM

Carbonate CO2 scrubbing process II (ECO2) – Practical experience and technical optimisation

The flue gas scrubbing was researched as part of the AiF IGF research project (IGF No. 18560 N, [1]). The project includes the optimisation of CO2 removal from the flue gas with simultaneous formation...

Issue 12/2014 OTTO-VON-GUERICKE-UNIVERSITÄT MAGDEBURG/GERMANY

Energy consumption and CO2 content in the flue gas of normal shaft kilns: Part 2: Influence of the limestone quality and the process parameters

1 Influence of the CO concentration in the flue gas The lime shaft kiln is used in the lime industry in order to produce so-called medium to hard-burnt lime. This type of kiln is also used in the...

Issue 06-07/2009

Limestone powder CO₂ scrubber – artificial limestone weathering for reduction of flue gas CO₂ emissions

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Related articles:

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