Zeolite Membrane Reactor for Pre-Combustion Carbon Dioxide Capture (Final Scientific/Technical Report) [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 622.4 Mine environment

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Office of the Assistant Secretary of Energy for Fossil Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2020

Mô tả vật lý: Size: 72 p. : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 267913

 Water-gas shift (WGS) reaction followed by carbon dioxide (CO<
 sub>
 2<
 /sub>
 ) separation is a critical step in the integrated gasification combined cycle (IGCC) process for fossil-fuel-fired electrical power generation with CO<
 sub>
 2<
 /sub>
  capture. To intensify the IGCC process hydrogen-permselective zeolite membrane reactor offers promise to replace the conventional energy-intensive fixed-bed reactors and solvent-based CO<
 sub>
 2<
 /sub>
  capture units. The objectives of this project were to develop a bench-scale zeolite membrane reactor (total membrane area: 932 cm<
 sup>
 2<
 /sup>
  for a 21-tube membrane bundle) for the water-gas-shift reaction of raw syngas from an oxygen-blown coal-gasifier for H<
 sub>
 2<
 /sub>
  production with simultaneous CO<
 sub>
 2<
 /sub>
  separation at the capability of about 2 kilograms H<
 sub>
 2<
 /sub>
  per day (equivalent to 2 kW IGCC power plant) and to demonstrate significant progress toward achieving overall performance goal of 90% CO<
 sub>
 2<
 /sub>
  capture rate with 95% CO<
 sub>
 2<
 /sub>
  purity at the cost of electricity 30% less than the baseline carbon capture approaches. This report summarizes results obtained in this project on scaling up the zeolite membrane reactor by a factor of 200 in membrane area, tests of the bench-scale zeolite membrane reactor for the water-gas-shift reaction at high temperature and high-pressure, and techno-economic analysis of the integration of the zeolite membrane reactor in IGCC power plant for the electrical generation with CO<
 sub>
 2<
 /sub>
  capture. With effective pore modification by catalytic cracking deposition of MDES (methyldiethoxysilane), fabrication of MFI-type zeolite membranes was successfully scaled-up from a lab-scale disk type to bench-scale multiple-tube bundles on low-cost alumina supports. A Co-Mo based sour shift catalyst was evaluated and used in the zeolite membrane reactors for water-gas-shift reaction. The reaction kinetic and gas-permeation equations were developed and employed in mathematic models to guide/predict experiments/performance of zeolite membrane reactors for water-gas shift reaction. Multiple-tube zeolite membrane bundles and reactors were designed, fabricated and tested for gas separation and water-gas-shift reactions with real raw syngas from a coal-fired gasifier operated at high temperature and pressure. The zeolite membrane reactors demonstrated good long-term thermal and chemical stability and constant H<
 sub>
 2<
 /sub>
  permeance (>
 300 GPU) together with a Knudsen selectivity (~4.7) for H<
 sub>
 2<
 /sub>
  over CO<
 sub>
 2<
 /sub>
  in the field test (cumulative time >
 28 hours) with high-sulfur coal-derived syngas. The zeolite-membrane-reactor integrated IGCC process was designed using the performance experimentally measured by the University of Cincinnati team with a single-tube zeolite membrane reactor that offers a CO conversion >
 98% with more than 90% of CO<
 sub>
 2<
 /sub>
  and H<
 sub>
 2<
 /sub>
  captured. With the above integrative approaches, a techno-economic analysis for a cost-benefit comparison was performed to uncover features that determine the power output, capital expenditure, operating expenditure, cost of electricity and cost of CO<
 sub>
 2<
 /sub>
  capture in a 550-MW zeolite-membrane-reactor integrated IGCC process. The integration of the zeolite membrane reactor in IGCC could provide a significant reduction of 80% and 27% in the power consumption for Selexol? Acid Gas Removal and CO<
 sub>
 2<
 /sub>
  compression, respectively, which lowers the total auxiliary power consumption by 12.5%. However, the low pressure required at permeate stream for maintaining the driving force of hydrogen permeation through the zeolite membrane costs a huge power in permeate compressor, compensating the power consumption reduction achieved with the membrane reactor. Thus, for coal-fired IGCC for electricity generation with 90% CO<
 sub>
 2<
 /sub>
  captured, the integration of the membrane reactor could provide a CO conversion ~99% and a significant drop in cost-of-electricity using zeolite membrane with H<
 sub>
 2<
 /sub>
  permeance >
 600 GPU and the H<
 sub>
 2<
 /sub>
 /CO<
 sub>
 2<
 /sub>
  selectivity over 70.
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