Page 22 - Impiantistica Italiana Maggio Giugno 2014

individually in a stand-
alone/greenfeld plant.
FW has also designed
CFB gasifcation plants
for over 100 MW ap-
th
plications for various
wood-based biomass
and waste fuels such
as such as REF (in-ori-
gin classifed REcycled
Table 1 - Foster Wheeler Energia Oy atmospheric gasifer references.
Fuel) and RDF (Refuse-
Derived Fuel). A preli-
continues at Foster Wheeler especially for the large minary layout model of the large scale gasifcation
scale applications (around 150 MW ), as shown in plant is shown in fgure 3.
th
table 1. This development work is a follow-on to
the very successful commercial-scale demonstra-
tion of the technology for example in Lahti gasifca- 2.2. Foster Wheeler pressurized
tion plant in Finland. CFB gasifcation development
The Lahti gasifcation plant is a 40–70 MW atmo-
th
spheric unit, which consists of a CFB gasifer, air The world’s frst complete IGCC (Integrated Gasi-
preheater, gas duct to the burners and two product fcation Combined Cycle) Power Plant, which utili-
gas burners in a pulverized coal-fred boiler. The ses wood as fuel, was built in Sweden in the early
whole concept including the product gas burners 1990’s (fgure 4). The plant is located in Värnamo
was designed by FW. The fow scheme of the Lah- and the technology used in the power plant is ba-

Fig. 2 - Flow scheme of the 40–70 MWth atmospheric CFB gasifer plant in Lahti as well as some gasifer feedstock

ti gasifcation plant and examples of the fuels are sed on gasifcation in a pressurised circulating fui-
shown in fgure 2. dised bed gasifer. The technology was developed
Based on the successes on the earlier projects and by Foster Wheeler Energia Oy in co-operation with
evaluation of the future needs, Foster Wheeler has the former Sydkraft AB.
been developing a larger-scale gasifcation concept The plant at Värnamo was a demonstration plant,
for converting various different types of fuels e.g. producing about 6 MW electricity to the grid, as
biomass, agro-biomass, waste based fuels etc., well as 9 MW heat to the district heating system,
into syngas either to be co-combusted directly in from a total fuel input equivalent to 18 MW. The
existing boilers or to be cleaned and combusted start-up phase was completed during spring 1996

18 Impiantistica Italiana - Maggio-Giugno 2014