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A Low Emission Power Plant: An Integrated Technique to Remove Major Pollutants

[+] Author Affiliations
Ali Ergut, Yiannis A. Levendis

Northeastern University, Boston, MA

Paper No. IMECE2002-33203, pp. 337-348; 12 pages
doi:10.1115/IMECE2002-33203
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Advanced Energy Systems
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Advanced Energy Systems Division
  • ISBN: 0-7918-3626-6 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

This manuscript presents an integrated approach for the simultaneous reduction of major combustion-generated pollutants from powerplants. This approach combines dry-sorbent injection for SO2 concentration reduction, coal injection (reburning) for NOx reduction in conjunction, with a ceramic honeycomb filter for particulate emission capture. A succinct economic analysis was conducted to show the financial feasibility of the system, as compared with other state of the art systems. The performance of low-cost commercial sorbent, calcium carbonate [CaCO3 ] as well as sodium bicarbonate [NaHCO3 ] was evaluated in this laboratory. The sorbent powders were blended with three types of pulverized coal (bituminous, sub-bituminous and lignite coal) to achieve NOx reduction and results were contrasted with the performance of the more costly sorbent calcium formate [Ca(COOH)2 ], which forms porous calcium oxide. The sorbents were injected in a simulated effluent gas containing SO2 and NO at a gas temperature of 1150°C (1423 K), upstream of the ceramic filter, which was kept at 600°C (873 K). Most of the tests have been run in the Ca/S range 1–2. The fuel-to-air equivalence ratio, φ, was in the neighborhood of 2 for all tests. This integrated sorbent/filter method is cost-effective in comparison to current technologies, on both capital cost ($/kW) and levelized cost ($/ton pollutant removed) bases, if a limestone/coal mixture is used as the sorbent for fossil fuel plants. Capital costs for the filter/sorbent combination are estimated to be in the range of $61–105/kWe for new plants of different size. Since current technologies are designed for removing one pollutant at a time both their cost and space requirements are higher than those of this integrated technique. At the minimum projected removal efficiencies for SO2 /NOx of in the order of 40% and particulate removal efficiencies in the order of 99%, the levelized costs are projected to be $203–261/ton of combined pollutant SO2 /NOx and particulates removed from coal fired power plants.

Copyright © 2002 by ASME

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