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TitleReduced order modeling of a commercial-scale gasifier using a multi-element injector feed system
AuthorHossein Sahraei, M; Duchesne, M AORCID logo; Boisvert, P G; Hughes, R WORCID logo; Ricardez-Sandoval, L AORCID logo
SourceIndustrial and Engineering Chemistry Research vol. 56, issue 25, 2017 p. 7285-7300,
Alt SeriesNatural Resources Canada, Contribution Series 20220125
PublisherAmerican Chemical Society (ACS)
Mediapaper; digital; on-line
File formatpdf
Subjectsfossil fuels; models; modelling
Illustrationsschematic models; cross-sections; tables; profiles
ProgramClean Fossil Fuels
Released2017 06 06
AbstractThis study presents a reduced order model (ROM) that describes the behavior of a commercial-scale short-residence gasifier which uses a multielement injector feed system. The state-of-the-art injection technology disperses the feed across the crosssection of the gasifier to enhance the mixing efficiency, thereby allowing a reduction in the reactor size and capital cost. A reactor network is integrated into the ROM to capture the laminar and mixing zones formed by each nozzle and subsequently the merging point of the multiphase flow coming from all of the nozzles. The results of the ROM are in reasonable agreement with the limited data reported for a short-residence time commercial-scale gasifier, that is, residence time, carbon conversion, and cold gas efficiency. Moreover, the performance of the gasifier is examined under changes in the operating pressure, number of injectors, flow nonuniformity, and plugging in the fuel's injection tubes. The ROM provides valuable insights on the operation of the commercial-scale gasifier and potential safety concerns that can be used to design suitable and safe operation policies for the system. Furthermore, sensitivity analyses on the model, design, and operational parameters are performed to assess the suitability of the model assumptions and identify the most important factors influencing carbon conversion, particle residence time, and temperature profiles.
Summary(Plain Language Summary, not published)
Gasification is used to generate electricity and produce chemicals. The Gas Technology Institute (GTI), previously as Aerojet Rocketdyne or Pratt & Whitney Rocketdyne, has been developing a compact gasifier with a multi-element feed injector that could reduce the cost of electricity generation by 18.5%. GTI has performed 18 tonnes per day (TPD) pilot-plant testing, risk reduction evaluations, solid pump testing and feed system testing to support development of this technology. The gasifier is now considered ready for demonstration at a scale of 400 TPD, which can support advancement towards the commercial scale at 1,000-3,000 TPD. However, experimental data for a system combining the multi-element feed system and compact gasifier are not available. To accelerate the development of such systems, the present contribution proposes a reduced order model (ROM) for the commercial scale. The ROM is used to investigate the performance of the gasifier system with various operating conditions and scenarios.

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