Liquid CO<sub>2</sub>/Coal Slurry for Feeding Low Rank Coal to Gasifiers [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 541.38 Radiochemistry

Thông tin xuất bản: Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2013

Mô tả vật lý: Size: 272 p. : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 268333

 This study investigates the practicality of using a liquid CO<
 sub>
 2<
 /sub>
 /coal slurry preparation and feed system for the E-Gas? gasifier in an integrated gasification combined cycle (IGCC) electric power generation plant configuration. Liquid CO<
 sub>
 2<
 /sub>
  has several property differences from water that make it attractive for the coal slurries used in coal gasification-based power plants. First, the viscosity of liquid CO<
 sub>
 2<
 /sub>
  is much lower than water. This means it should take less energy to pump liquid CO<
 sub>
 2<
 /sub>
  through a pipe compared to water. This also means that a higher solids concentration can be fed to the gasifier, which should decrease the heat requirement needed to vaporize the slurry. Second, the heat of vaporization of liquid CO<
 sub>
 2<
 /sub>
  is about 80% lower than water. This means that less heat from the gasification reactions is needed to vaporize the slurry. This should result in less oxygen needed to achieve a given gasifier temperature. And third, the surface tension of liquid CO<
 sub>
 2<
 /sub>
  is about 2 orders of magnitude lower than water, which should result in finer atomization of the liquid CO<
 sub>
 2<
 /sub>
  slurry, faster reaction times between the oxygen and coal particles, and better carbon conversion at the same gasifier temperature. EPRI and others have recognized the potential that liquid CO<
 sub>
 2<
 /sub>
  has in improving the performance of an IGCC plant and have previously conducted systemslevel analyses to evaluate this concept. These past studies have shown that a significant increase in IGCC performance can be achieved with liquid CO<
 sub>
 2<
 /sub>
  over water with certain gasifiers. Although these previous analyses had produced some positive results, they were still based on various assumptions for liquid CO<
 sub>
 2<
 /sub>
 /coal slurry properties.
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