Extended Abstract: Operation of Carbon-Capture Integrated into Industrial Combined-Heat-and-Power Plants - Dependency on Hourly to Seasonal Load Changes

Abstract

Partial capture, i.e. capture of a part of the CO2 accessible from the plant, is motivated by a reduced capture cost and thus, an easier implementation of carbon capture and storage (CCS). Partial capture, as defined in the work by Biermann et al. [1], may be favorable in case of 1) multi-stack sites; 2) achieving emission performance standards; 3) sites with access to low-value excess heat that can power the capture process; 4) industries with ability to adapt their production to variations in energy market conditions and perform CO2 capture in cases with low revenues for heat and electricity generation. This work discusses partial capture from heat and power plants integrated with an industrial site, i.e. points 3) and 4) above. Energy-intensive industrial sites (e.g. steel or pulp and paper mills) are often multiproduct facilities selling their excess electricity and low-value heat as district heating from on-site combined-heatand- power plants (CHP). The demand for electricity and district heating varies with the time of day, weather conditions and season. Excess energy not deemed valuable are disregarded through cooling, emission of warm gases, or through flaring. The aim of the present work is to map the variations in production and available excess heat from an integrated steel mills and investigate the effect of these variations on the capture plant and its performance.