Page 53 - Impiantistica Novembre-Dicemvre 2015

slaergiteshtaismapalacrtgoenimthpeaCctOo2navthoeidaLnCcOeEcoosf tt,hbeerceafue-- ference pulverised coal plant without CCS.

rence plant. Conversely, the coal price, which has a tChoesrtesfeorfenCcOe 2pleamntisasrioen60a-v6o5id€a/ntcfeorcboomileprarbeadsetdo
plants with CCS and 95-100 €/t for IGCC plants.
relatively large impact on the COE of the plant with

capture has a relatively small impact on the avoi-

dance cost, because it has broadly similar impacts

on both plants, the only difference being due to cInocmrebaussintigonthaenrdateIGoCfCCOpl2anctasptwuoreultdo 98% in oxy-
increase the
the lower efficiency of the plant with capture. Apart

from the emissions cost, the parameter which has cost of electricity by 3-5% but reduce the cost per

the greatest impact on the avoidance cost, for the tonne of CO2 emissions avoided by 3%.

ranges considered in this study, is the CO2 tran-
sport and storage cost.
Co-firing biomass can be used to rzeedrou,ceasnseutmCinOg2
emissions of plants with CCS to

Conclusions biomass is regarded as a zero CthOis2 fuel. In a plant
with post combustion capture increases the
The thermal efficiencies of power plants with CCS
based on pulverised coal combustion with post cost of electricity by 6% and has no impact on
combustion capture, oxy-combustion and IGCC
with pre-combustion capture are 34.8 - 35.7% the cost of tCheO2coasvtooidf abniocme,absus,t the cost depends
LHV basis, which is around 9 percentage points strongly on which depends on
lower than a reference pulverised coal plant without
capture. the availability.

The levelised cost of base load electricity genera- The net efficiency of producing hydrogen by coal
tion is about 92 €/MWh for boiler-based plants with gasification with CCS is 57.8% on an LHV basis
oxy-combustion or post combustion capture and (65.5% HHV basis) and the levelised cost of hydro-
115 €/MWh for IGCC plants with pre-combustion gen is 16.1 €/GJ LHV basis (13.6 €/GJ HHV).
capture. This is about 75-125% higher than the re-
Alternative cooling systems could be used to redu-
ce the water requirements of pulverised coal power
plants with CCS to close to zero. The reduction

Sviluppo degli impianti a carbone
per produzione di energia elettrica
e idrogeno con cattura della CO2

Nei mesi passati, la IEAGHG (International Energy Agency Greenhouse Gas) ha commissionato ad Amec Foster

Wheeler uno studio per valutare le prestazioni e i costi degli impianti a carbone con cattura dell’anidride carbonica

dedicati sia alla produzione di energia elettrica sia alla produzione di idrogeno. Lo studio esamina le tre tecnologie

cspuarictntccueirpasaspliivrpeae-screolapmacbraautzstuitoironanededeienllalliamCcpOriia2o,ngoteivndvieicgraoadslaeslilcfaicaCattzuOiro2anppee.orsct-ocnodmenbsuasztiioonnee e la combustione con ossigeno con la
in centrali a carbone convenzionali e

Il risultato è una fotografia dello stato attuale dello sviluppo delle tecnologie di cattura e dei costi associati nonché

una base per eventuali studi successivi su altri processi di cattura della CO2 in settori diversi dalla generazione
elettrica e dalla produzione di idrogeno.

L’articolo riassume i risultati tecnico-economici di questo studio, ovvero prestazioni, costi di investimento e

principali parametri finanziari, quali costo di generazione dell’energia elettrica, (LCOE, Levelised Cost of Electricity)

esigcnoisfitcoatdiveillpaaCraOm2eetvriittaetcan(iCciAeCfiCnaonsztiaorfi.CO2 Avoidance) per le diverse tipologie di impianto analizzate e al variare di
Impiantistica Italiana - Novembre-Dicembre 2015 51