Process Synthesis of a Gasification Process Modified for High Solar Energy Integration
Solar energy can be integrated with chemical processes to transform solar energy into a more convenient form and to save natural ressources. A gasification process has been examined as an example of a solar process with advanced elements, including the co
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PROCESS SYNTHESIS OF A GASIFICATION PROCESS MODIFIED FOR HIGH SOLAR ENERGY INTEGRATION
G. BIRKE R, REIMERT
LURGI, FRANKFURT
M. Becker (ed.), Solar Thermal Energy Utilization © Springer-Verlag Berlin Heidelberg 1987
Contents
Summary
551
1.
The CFB_TO_MEOH-solar Process as a Reference Process for Solar Process Synthesis
554
2.
Solar-specific Design Topics Problem Definition and Solving Modeling of Solar Process Plants Formal Handling of Solar Design Topics ASPEN-Model of the CFB_TO_MEOH-solar Process
555 555 558 558 561
Elements of the CFB_TO_MEOH-solar Process Solar CFB-gasification with Integrated Power and/or Hot Gas Generation Raw Gas Conditioning and Compression Shift Conversion Gas Cooling and Cleaning Methanol-Synthesis Hot-Gas Loop and Methane Steamreforming Oxygen Plant Drying Plant Steam System and Energy Scheme
564 564
2. 1 2.2 2.3 2.4 3. 3. 1
3. 2 3. 3 3.4 3. 5
3.6 3. 7
3.8 3.9 4. 4. 1 4.2
4. 2.1 4. 2. 2 4. 2. 3 4.3
5. 5. 1 5.2 5. 2. 1
CFB_TO_MEOH- solar Process on Basis Biomass Biomass Combination of Solar CFB-Gasification with Power Generation Definition of Cases Design of Plant Results and Conclusions Influence of Solar Operation Time on Integration Results
568 568 574 575 577 581 587 588 591 592 594 594 594 599 603
5. 2. 3
CFB_TO_MEOH-solar Process on Basis Lignite The Material Lignite A Solar Process with Shift Gas Buffer Definition of Cases Design of Plant Results
606 606 608 608 610 613
6. 6.1 6.2
Conclusions Major Results of this Study Research Required
614 614 617
7.
Literature
619
5.2.2
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summary Solar energy can be integrated with chemical processes to transform solar energy into a more convenient form and to save natural ressources. A gasification process has been examined as an example of a solar process with advanced elements, including the combination of several energy absorbing steps, usage of solar-modified processes and solar-specific components. The basic assumptions of this process are: the gasification in the Circulating Fluid Bed (CFB) to produce synthesis gas is the primary energy absorbing process. Solar energy is integrated in the reaction system via direct insolation. The raw materials are biomass and lignite. Solar gasification of biomass is an example of a scenario based on completely regenerable energy. The anticipated product is methanol, which is easily integrated in existing productiun and consumption schemes. Many aspects of the methanol synthesis route are exemplary for any synthesis. So, the CFB TO MEOH-solar process will serve as a reference process for studying problems of integration of solar energy into chemical processes, i.e. solar process synthesis. A problem analysis and detailed breakdown leads to the basic concept: solar energy is integrated in an advanced step which combines specific features of solar energy (radiation) and the reaction system (energy absorption, distribution and consumption) in a nearly ideal manner. A further advantage is, that a combination of chemical reaction and power generation is possible. The
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