FGD

Titel:
Absorption and reemission processes of mercury in wet flue gas desulphurisation unit (FGD)

Editor:
M. Sc. Mohammad Nader Alskaf

Duration:
07/2019 – 06/2021

Funding institution:
AiF-IGF

Project partner:
IUTA – Institut für Energie- und Umwelttechnik e. V.

Background and motivation:

Mercury (Hg) in its oxidised form (Hg^_ox), can be well separated by absorption in the scrubber of the flue gas desulphurisation plant. However, re-emission processes take place in this unit. These reemission proesses jeopardise the compliance of the emissions limit.

The aim of this project is to develop an extended knowledge about the interaction of the different operation parameters as comprehensive as possible, so that an optimum in the seperation efficiency achieved when the site-specific mode of operation is specified.

The knowledge is prepared in such a way that potential professional users, for instance: consulting engineering offices, plant constructors and suppliers of additives can apply it directly and, on the basis of this knowledge, develop process optimisations and define guarantees with regard to lower Hg emissions in a risk-free manner.

For the research and development works, a cooperation is conculded between the Institute for Energy and Environmental Technology E. V. (IUTA) and the Institute of Process and Environmental Engineering, Chair of Energy Process Engineering at the TU Dresden (EVT).

The work steps are as followed:

AP_IUTA_1¹: Studies of possible reaktions in a FGD with the focus on a solid/liquid equilibrium.

AP_IUTA_2: Construction and modification the FGD on laboratory scale.

AP_IUTA_3:   Test series on the FGD plant on a laboratory scale.

AP_IUTA_4: Analysis the possible solid compounds of mercury.

AP_EVT_1 : Development and validation of a droplet model.

AP_EVT_2: Structural extension of the experimental unit (FGD) at the TU Dresden.

AP_EVT_3:  Series of measurements at the experimental unit (FGD).

AP_EVT_4: Verification the model at a real power plant FGD.

AP_IUTA_5 / EVT5: Project coordination, reporting.

¹:  AP: Arbeitspaket = work steps.

If you are interested in participating in this research project in the project-accompanying committee, please contact the project manager: Dr.-Ing. Daniel Bernhardt.

Publications and presentations:

• Alskaf, M.N.; Köhler, M.: Absorption and reemission processes of mercury in wet flue gas desulphurisation unit, project-accompanying committee, 26.11.2020, Dresden, online.
• Alskaf, M.N.; Ohle, A.: Absorption and reemission processes of mercury in wet flue gas desulphurisation unit, Annual meeting of the ProcessNet specialist group gas cleaning, 10.03.2020, Bamberg.

• Alskaf, M.N.; Ohle, A. „Absorptions- und Reemissionsvorgänge von Quecksilber in Wäschern zur Entschwefelung von Verbrennungsabgasen“, project-accompanying committee, 21.10.2019, Dresden.

• Bittig, M.; Klöfer, I.; Herrmann, D.; Ohle, A.: Mercury separation in FGD scrubbers, a comparison between the actual state of the studies and practical experience. In: Beckmann, M. (eds.): Emission reduction in power plants 2018. Freiberg: SAXONIA , Standortentwicklungs- und -verwaltungsgesellschaft mbH, 2018, p. 141-151. ISBN 978-3-934409-82-8.

Documents of the first meeting of the project-accompanying committee:

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