Page 228 - New Trends In Coal Conversion

190 New Trends in Coal Conversion

to economic reasons operations at Kemper County, was going to shift to natural gas as
fuel feedstock instead of coal (Geuss, 2017; Lunsford, 2017).

7.2.2.1.4 Edwardsport
The Edwardsport IGCC Plant is a facility located in Knox County, Indiana, owned by
Duke Energy, with a capacity of 618 MW, which replaced the Duke Energy’s former
160 MW coal-fired Edwardsport Station (Duke Energy, n.d.). The plant is based on the
GE Energy “Reference Plant” design, which basically consists of two GE gasifiers in
parallel, two GE-7FB combustion turbines in parallel (236 MWe each), and one GE-
G13 steam turbine (322 MWe) (Marchino, 2013). Moreover, the facility also includes
an activated carbon bed for mercury absorption, two heat recovery steam generators
equipped with selective catalytic reduction for nitrogen oxide control and multiple-
cell cooling tower. The global result is that the Edwardsport IGCC Plant is considered
one of the cleanest and most efficient coal-fired plants of the world, although its final
cost (estimated at $3.55 billion) almost duplicates the initial estimations. Nevertheless,
as far as these authors’ knowledge, the plant is currently operating since its beginning
in commercial operation in June 2013 (Duke Energy, n.d.; NETL, n.d.-c).

7.2.2.1.5 Polk Power Station
Tampa Electric’s Polk Power Station is one of the two demonstrations projects of
advanced gasification combined cycle (IGCC) in the United States. The plant uses
the gasification technology originally developed by Texaco, now General Electric,
which is based on oxygen-blown, slurry-fed, entrained flow gasifier, operating at
400 psi nominal, to produce syngas from 2200 tons/day of coal and petroleum coke
blend (20/80), which feeds a combined-cycle turbine system to produce electricity
(320 MW Gross output, 250 MW net) (Hornick, 2015; NETL, n.d.-f; TECO, 2017).
With the lessons learned from Polk 1 IGCC, Tampa Electric decided to expand the
project to Polk 2. In early 2017, Tampa Electric completed the conversion of four
existing simple-cycle combustion turbine units into a modern and efficient combined
cycle unit. This expansion added approximately 460 MW of generating capacity while
increasing the efficiency of the existing units by 37%. Using selective catalytic reduc-
tion (SCR) technology, the project reduces nitrogen oxide emissions by over 75% from
the existing units (TECO, 2017).

7.2.2.1.6 Texas Clean Energy Project
The Texas Clean Energy Project (TCEP) is an IGCC polygeneration facility with fully
integrated CO 2 capture that is located in Penwell, Texas, 15 miles west of Odessa. The
gasification technology applied is based on a Siemens SFG-850 entrained-flow,
oxygen-blown gasifier, and a Siemens high-hydrogen power block. Besides, the plant
includes two-stage water-gas shift to produce high H 2 synthesis gas (syngas) and Linde
®
Rectisol Wash Unit (RWU) acid gas removal (AGR) to achieve around 90% carbon
capture efficiency for the entire syngas stream, around 2 Mtons-per-year of CO 2 ,