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	Institute of Chemical Process Fundamentals ASCR, v.v.i. Prague

Laboratory of Gas-Solid Systems, Emissions, and Waste Control

Research staff: K. Svoboda, M. Hartman, O. Trnka

Technical staff: M. Pohorely

• Gas-solid reactions
• Gas-solid reactors and operations
• Fluidized bed combustion
• Gaseous and particulate emissions from combustion and industrial processes
• Solid waste treatment and co-combustion

Combustion of sewage sludge in the circulating fludized bed

(M. Hartman, supported by GA ASCR, grant No. A4072201)

The proposed research is orientated towards resolving the burdensome difficulties with current disposal of voluminous digested sewage sludge. The project addresses most relevant issues related to its combustion such as (very) high contents of moisture, volatile matter and nitrogen, the presence of heavy metals, emissions of pollutant gases as well as the handling of solid by-products. [Refs. 4-8, 11, 14]

Agglomeration in fluidized-bed reactors

(M. Hartman, supported by GA CR, grant No. 203/02/0002)

The study is aimed at resolving the troublesome problems in fluidized-bed processes at conditions where particles are sticky and agglomeration tends to occur. The subject of research is the capability of a fluidized bed to handle particulate solids becoming sticky/wet by the presence of liquids or during chemical reactions taking place within the bed. [Refs. 3, 5, 7, 8, 12]

Evaluation of dynamic states of gas fluidized suspensions via pressure fluctuations

(O. Trnka, supported by GA ASCR, grant No. A4072001)

Research is oriented on developing new tools for the on-line diagnostics of flow regimes in fluidized beds. Pressure fluctuations within the beds are measured and subjected to detailed analysis. Novel and rigorous computational procedures are developed for the evaluation of pressure fluctuation time series. [Refs. 5, 8, 10, 12]

Click here for explanation of abbreviations used on this page.

• University College London, London, Great Britain: High temperature fluidization
• University of Connecticut, Storrs, USA: Desulfurization of Gases
• Delft University of Technology, Delft, the Netherlands: Circulating fluidized beds
• Technical University Cottbus, Germany: Pressurized fluidized bed combustion
• Institute of Physical Chemistry, PAS, Warsaw, Poland: Fluidized bed operations
• Institute for Energy, Joint Research Centre, Petten, the Netherlands: Pressurized fluidized bed combustion/gasification technologies; Waste incineration/gasification

• K. Svoboda: Institute for Energy, Joint Research Centre of European Commission, Petten, the Netherlands (9 months)

• M. Carsky, University of Durban-Westville, Republic of South Africa

• M. Hartman: ICT, postgraduate course "Multiphase reactors"

Original papers

1. Hartman M., Trnka O.: Calcination of Calcium-Based Sorbents at Pressure in a Broad Range of CO2 Concentrations. Chem. Eng. Sci. 58(14), 3299-3300 (2003).

2. Hartman M., Trnka O., Svoboda K., Vesely V.: Thermal Dissociation and H2S Reactivity of Czech Limestones. Chem. Pap. 57(3), 309-316 (2003).

3. Svoboda K., Pohorely M., Hartman M.: Effects of Operating Conditions and Dusty Fuel on the NOx, N2O and CO Emissions in PFB Co-Combustion of Coal and Wood. Energy Fuels 17(4), 1091-1099 (2003).

4. Hartman M., Pohorely M., Trnka O.: Transport Velocities of Different Particulate Materials in Pneumatic Conveying. Chem. Eng. Sci., submitted.

5. Hartman M., Trnka O., Svoboda K., Vesely V.: Impediment to Gas-Porous Particle Fluidization Due to Liquid Depositing upon the Solids. Chem. Eng. Commun., submitted.

6. Pohorely M., Svoboda K., Hartman M.: Komurkovy suvny davkovac sypkych materialu. (Czech) Slide Feeder of Different Particulate Materials. Chem. Listy, submitted.

7. Pohorely M., Svoboda K., Hartman M.: Feeding Smaller Quantities of the Particulate Solids. Powder Technol., submitted.

8. Svoboda K., Hartman M., Pohorely M., Trnka O.: Modelling of Effects of Operating Conditions and Coal Reactivity on Temperature of Burning Particles in Fluidized Bed Combustion. Acta Montana Ser. B, submitted.

9. Svoboda K., Pohorely M.: Influence of Operating Conditions and Coal Properties on NOx and N2O Emissions in Pressurized Fluidized Bed Combustion of Subbituminous Coals. Fuel, submitted.

10. Trnka O., Hartman M., Vesely V.: Charakteristika tlakovych fluktuaci v ruznych rezimech suspenzi plyn - tuha latka. (Czech) Characteristics of the Pressure Fluctuations in Different Operation Regimes of Gas-Solid Suspensions. Chem. Listy, submitted.

Review papers

11. Hartman M., Svoboda K., Vesely V., Trnka O., Chour J.: Tepelne zpracovani cistirenskych kalu. (Czech) Sewage Sludge Thermal Processing. Chem. Listy 97(10), 976-982 (2003).

12. Hartman M., Trnka O., Svoboda K., Vesely V.: Aglomerace castic a defluidacni jevy ve fluidni vrstve. (Czech) Agglomeration of Particles and Defluidization Phenomena in the Fluid Bed. Chem. Listy 97(9), 942-948 (2003).

13. Svoboda K., Hartman M., Trnka O., Cermak Ji.: Vysokoteplotni palivove clanky, vhodna paliva a moznosti jejich vyuziti. (Czech) High-Temperature Fuel Cells, Their Status, Fuels and Applications. Chem. Listy 97(1), 9-23 (2003).

14. Svoboda K., Fernandez Gutierrez M.-J., Baxter D., Hunter Ch.: N2O Emissions from Waste and Biomass Incineration Plants. Waste Management, submitted.

Conferences

15. Svoboda K., Hartman M., Baxter D., Hunter C.: Integration of Biomass Gasification with High Temperature Fuel Cells. Second International Conference of Central European Energy, Efficiency and Renewable Energy Sources CEEERES'03, Proceedings, p. 145-155, Prague, Czech Republic, 10-11 November 2003.

16. Svoboda K., Pohorely M., Hartman M.: Emissions in Pressurized Bed Co-Combustion of a Subbituminous Coal with Wood. 30th International Conference of Slovak Society of Chemical Engineering, Proceedings, p. 80, Tatranske Matliare, Slovakia, 26-30 May 2003.

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