Formation and Control of Fuel-nitrogen Pollutants in Catalytic Combustion of Coal-derived Gases PDF Download
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Author: Frediano V. Bracco
Publisher:
ISBN:
Category : Coal gasification
Languages : en
Pages : 20
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Book Description
The review of data on NH3 and HCN concentrations in the low /medium-Btu off-gases from the Mond, Riley-Morgan, Lurgi, Koppers-Totzek, Hygas and Synthane coal gasifiers indicates that NH3 is present at concentrations of 385-11,000 ppmV and HCN at concentrations up to 300 ppmV. There is a tendency for NH3 concentration to increase as the heating value of the low /medium-Btu gas increases. The observed NH3 concentrations are consistently greater than calculated equilibrium values even when the lowest possible gasifier temperatures (at the outlet) are assumed. The fraction of coal-bound nitrogen converted to NH3 + HCN is 12 to 91 percent. A rough estimate of the amount of NH3 + HCN in raw low/medium-Btu gases can be obtained by subtracting the nitrogen in gasifier byproducts (ash, char and tar) from the amount of coal-bound nitrogen and assuming complete conversion of the difference to NH3 + HCN. The reported concentrations of NH3 and HCN in purified low/medium-Btu gases indicate that levels of 1 to 10 ppmV NH3 and 1 to 100 ppmV HCN can be reached in low temperature cleanup at the expense of sensible heat.
Author: Frediano V. Bracco
Publisher:
ISBN:
Category : Coal gasification
Languages : en
Pages : 20
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Book Description
The review of data on NH3 and HCN concentrations in the low /medium-Btu off-gases from the Mond, Riley-Morgan, Lurgi, Koppers-Totzek, Hygas and Synthane coal gasifiers indicates that NH3 is present at concentrations of 385-11,000 ppmV and HCN at concentrations up to 300 ppmV. There is a tendency for NH3 concentration to increase as the heating value of the low /medium-Btu gas increases. The observed NH3 concentrations are consistently greater than calculated equilibrium values even when the lowest possible gasifier temperatures (at the outlet) are assumed. The fraction of coal-bound nitrogen converted to NH3 + HCN is 12 to 91 percent. A rough estimate of the amount of NH3 + HCN in raw low/medium-Btu gases can be obtained by subtracting the nitrogen in gasifier byproducts (ash, char and tar) from the amount of coal-bound nitrogen and assuming complete conversion of the difference to NH3 + HCN. The reported concentrations of NH3 and HCN in purified low/medium-Btu gases indicate that levels of 1 to 10 ppmV NH3 and 1 to 100 ppmV HCN can be reached in low temperature cleanup at the expense of sensible heat.
Author:
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Category :
Languages : en
Pages :
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The objective of this program has been the elucidation of the mechanism of high temperature catalytic oxidation of coal-derived gases, including their individual constituents, and the effects of sulfur and nitrogen impurities. Detailed experimental data were obtained and a two-dimensional model is being developed and tested by comparison with the experimental data. When complete, the model can be used to optimize designs of catalytic combustors. The model at present includes axial and radial diffusion and gas and surface chemical reactions. Measured substrate temperatures are input in lieu of complete coupling of gas and solid energy conservation equations and radiative heat transfer. Axial and radial gas temperature and composition profiles inside a catalyst channel were computed and compared with experimental measurements at the catalyst outlet. Experimental investigations were made of carbon monoxide and medium-Btu gas combustion in the presence of platinum supported on a monolithic Cordierite substrate. Axial profiles of substrate temperature, gas temperature, and gas composition were determined at different gas velocities and equivalence ratios. The effects of H2S and NH3 in the medium-Btu gas were also investigated. Systems were proposed for making resonance absorption and Raman scattering measurements of gas temperature and/or species concentrations in a catalytic reactor. A new pulsed multipass Raman scattering technique for increasing photon yield from a scattering volume was developed.
Author: Princeton University. Dept. of Aerospace and Mechanical Sciences
Publisher:
ISBN:
Category : Coal gasification
Languages : en
Pages : 11
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Book Description
Author: Frediano V. Bracco
Publisher:
ISBN:
Category : Coal gasification
Languages : en
Pages : 11
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Book Description
The review of data on NH3 and HCN concentrations in the low /medium-Btu off-gases from the Mond, Riley-Morgan, Lurgi, Koppers-Totzek, Hygas and Synthane coal gasifiers indicates that NH3 is present at concentrations of 385-11,000 ppmV and HCN at concentrations up to 300 ppmV. There is a tendency for NH3 concentration to increase as the heating value of the low /medium-Btu gas increases. The observed NH3 concentrations are consistently greater than calculated equilibrium values even when the lowest possible gasifier temperatures (at the outlet) are assumed. The fraction of coal-bound nitrogen converted to NH3 + HCN is 12 to 91 percent. A rough estimate of the amount of NH3 + HCN in raw low/medium-Btu gases can be obtained by subtracting the nitrogen in gasifier byproducts (ash, char and tar) from the amount of coal-bound nitrogen and assuming complete conversion of the difference to NH3 + HCN. The reported concentrations of NH3 and HCN in purified low/medium-Btu gases indicate that levels of 1 to 10 ppmV NH3 and 1 to 100 ppmV HCN can be reached in low temperature cleanup at the expense of sensible heat.
Author: Princeton University. Dept. of Aerospace and Mechanical Sciences
Publisher:
ISBN:
Category : Coal gasification
Languages : en
Pages : 11
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Book Description
Author: Princeton University. Department of Aerospace and Mechanical Sciences
Publisher:
ISBN:
Category : Coal gasification
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 852
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1220
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1234
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1040
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