Transforming carbon-intensive coal-fired power plants into negative emission technologies via biomass-fired calcium looping retrofit  

作　　者：Dawid P.Hanak 

机构地区：[1]Net Zero Industry Innovation Centre,Teesside University,Ferrous Road,Riverside Park Industrial Estate,Middlesbrough TS21DJ,United Kingdom

出　　处：《Clean Energy》2024年第6期263-282,共20页清洁能源(英文)

基　　金：supported by the UK Carbon Capture and Storage Research Community Flexible Funding[2023].

摘　　要：Calcium looping is a promising CO_(2)capture technology due to reduced energy and economic penalties compared to mature solvent scrubbing technologies.It also can enable negative CO_(2)emissions when biomass is used to drive the sorbent regeneration process in the calciner.However,the trade-off between the energy,economic and environmental performance under different biomass co-firing fractions in the calciner and process operating scenarios has not yet been well understood.This study examined the potential for transforming a 580 MW_(el) coal-fired power plant into a negative CO_(2)emitter via retrofit of calcium looping with biomass co-firing in the calciner.High-fidelity process models were developed in Aspen Plus and used to analyse the effect of biomass co-firing fraction,CO_(2)capture rate in the carbonator,and the fraction of flue gas fed to the carbonator on the techno-economic performance indicators.The results revealed that co-firing 30%biomass with coal in the calciner was sufficient for the retrofitted process to achieve negative CO_(2)emissions(-3.9 gCO_(2)/kW_(el)h).In this scenario,the levelized cost of electricity was 5%lower(81.1€/MW_(el)h)than that in the reference retrofit scenario without biomass co-firing(85.4€/MW_(el)h)at a carbon tax of 100€/tCO_(2).Further improvement to the techno-economic performance was achieved by reducing the amount of CO_(2)captured in the carbonator by reducing either the CO_(2)capture rate(81.1€/tCO_(2))or the amount of flue gas processed(80.4€/tCO_(2)).Although this was achieved at the expense of the increased specific CO_(2)emissions to 65.2 gCO_(2)/kW_(el)h and 109.0 gCO_(2)/kW_(el)h,respectively,the net specific emissions were still about 90%lower than those of the unabated host plant(792.3 gCO_(2)/kW_(el)h).This study demonstrated that depending on design priorities,biomass co-firing in the calciner can transform the existing coal-fired power plants into negative CO_(2)emission technologies or improve the process techno-economic viability.

关 键 词：biomass co-firing carbonate looping techno-economic analysis decarbonisation coal-fired power plants carbon capture climate change greenhouse gas emissions negative emissions 

分 类 号：X75[环境科学与工程—环境工程]