Title: Beneficial Reuse of Industrial CO2 Emissions Using a Microalgae Photobioreactor: Waste Heat Utilization Assessment

Abstract

Microalgae are a potential means of recycling CO2 from industrial point sources. With this in mind, a novel photobioreactor (PBR) was designed and deployed at a coal-fired power plant. To ascertain the feasibility of using waste heat from the power plant to heat algae cultures during cold periods, two heat transfer models were constructed to quantify PBR cooling times. The first, which was based on tabulated data, material properties and the physical orientation of the PBR tubes, yielded a range of heat transfer coefficients of 19–64 W m−2 K−1 for the PBR at wind speeds of 1–10 m s−1. The second model was based on data collected from the PBR and gave an overall heat transfer coefficient of 24.8 W m−2 K−1. Energy penalties associated with waste heat utilization were found to incur an 18%–103% increase in energy consumption, resulting in a 22%–70% reduction in CO2 capture for the scenarios considered. A techno-economic analysis showed that the cost of heat integration equipment increased capital expenditures (CAPEX) by a factor of nine and increased biomass production costs by a factor of three. Although the scenario is thermodynamically feasible, the increase in CAPEX incurs an increase in biomass production cost that ismore » economically untenable.« less

Authors:

Mohler, Daniel T.; Wilson, Michael H.; Fan, Zhen; Groppo, John G.; Crocker, Mark

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• Search DOE PAGES for ORCID "0000-0002-6560-8071"
• Search orcid.org for ORCID "0000-0002-6560-8071"

Publication Date:

2019-07-09

Sponsoring Org.:

USDOE

OSTI Identifier:

1532774

Grant/Contract Number:  

FE0026396

Resource Type:

Published Article

Journal Name:

Energies

Additional Journal Information:

Journal Name: Energies Journal Volume: 12 Journal Issue: 13; Journal ID: ISSN 1996-1073

Publisher:

MDPI AG

Country of Publication:

Switzerland

Language:

English