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Woodgas cooler
Koláček, Martin ; Toman, Filip (referee) ; Lachman, Jakub (advisor)
This bachelor thesis deals with problematics of designing a cooler suitable for gas produced by gasification of biomass. The current state of knowledge is presented in research part of this thesis. Subsequent design segment contains detailed calculations, design and construction solution of cooler suitable for producer gas. Cooling of gas created by biomass gasification is more problematic than cooling of pure gases or water vapor because producer gas contains many impurities that condense during cooling process and settle inside cooler. Thus, complicating design of effective cooling device. Our motivation for cooling producer gas is increasing its energy density and decreasing its volume. Basic technical documentation of designed cooler is also part of this thesis.
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Application of Commercial Sorbent into Coal-derived Syngas Desulfurization Field for Clean Coal technologies Development
Chien, H.-Y. ; Chyou, Y.-P. ; Svoboda, Karel
Advanced applications of producer gas (e.g. fuel cells, catalytic processes for liquid fuels production) require deep gas cleaning. Dry desulfurization technologies of fuel gas select appropriate sorbents according to material’s physical and chemical properties like sulfur capacity, attainable sulphur concentration in gas, price, etc.. The properties of a commercial sorbent were determined by means of XRD, ICP-OES, SEM and surface area measurement. The main components of the sorbent were ZnO, CuO and alumina. The content of effective metal oxides for desulfurization reaches approx. 70% , the surface area is 90.8 m2/g. The sorbent has been used as a moderate-temperature desulfurization agent (300-600oC) for H2S removal from model gas in a fixed-bed reactor. Its H2S removal properties are promising for application in clean coal technology field. The theoretical amount of sulfur capacity according to effective metal oxide content in the sorbent is 20.5 g-S/100 g.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22015061614110 - PDF
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Thermodynamic Interferences of HCl and HF in Producer Gas Desulfurization by Ce, La, Mn and Zn Based Solid Sorbents
Hartman, Miloslav ; Svoboda, Karel ; Pohořelý, Michael ; Šyc, Michal ; Jeremiáš, Michal ; Huang, Ch.-Y.
In our thermodynamic theoretical study we concentrated our attention on thermodynamics of gas-solid desulfurization reactions (H2S, COS, thiophene), properties of sorbents (melting point evaporation), attainable equilibrium sulfur compounds concentrations in gas at temperature 500 – 1100 K (227-827 oC) under conditions typical for producer gas composition. Similarly removal of HCl and HF by Ce, La, Zn, Mn and Ni oxides based sorbents is described and possible interferences in simultaneous sorption of HCl or HF with H2S are analyzed. Suitable conditions and sorbents are suggested for deep removal of sulfur compounds in presence of HCl. Conditions for efficient preliminary removal of HCl and HF by alkali-based sorbents (NaHCO3, K2CO3, Ca(OH)2, CaCO3) are suggested and possible interferences caused by H2S are analyzed in terms of attainable equilibrium concentrations of HCl and HF in presence of H2S. Properties of La and Ce-based sorbents for sulfur compounds are compared with Zn, Mn and Ni based sorbents in terms of efficiency and interferences caused by presence of hydrogen-halides (HCl, HF).
Fulltext: content.csg - PDF
Plný tet: SKMBT_C22014082908320 - PDF
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