Study of new cascade heating system with multi-heat sources based on exhausted steam waste heat utilization in power plant

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 is economically untenable.

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The thermoelectric generators use for waste heat utilization from conventional power plant

E3S Web of Conferences ◽

10.1051/e3sconf/20171401032 ◽

2017 ◽

Vol 14 ◽

pp. 01032 ◽

Cited By ~ 2

Author(s):

Karol Sztekler ◽

Krzysztof Wojciechowski ◽

Maciek Komorowski

Keyword(s):

Power Plant ◽

Waste Heat ◽

Thermoelectric Generators ◽

Heat Utilization ◽

Waste Heat Utilization ◽

Conventional Power Plant

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Influence of heat recuperation in ORC power plant on efficiency of waste heat utilization

Archives of Thermodynamics ◽

10.2478/v10173-010-0032-7 ◽

2010 ◽

Vol 31 (4) ◽

pp. 111-123 ◽

Cited By ~ 5

Author(s):

Aleksandra Borsukiewicz-Gozdur

Keyword(s):

Power Plant ◽

Output Power ◽

Waste Heat ◽

Organic Rankine Cycle ◽

Internal Heat ◽

External Heat ◽

Working Fluid ◽

Heat Utilization ◽

Heat Recuperation ◽

Waste Heat Utilization

Influence of heat recuperation in ORC power plant on efficiency of waste heat utilization The present work is devoted to the problem of utilization of the waste heat contained in the exhaust gases having the temperature of 350 °C. Conversion of the waste heat into electricity using a power plant working with organic fluid cycles is considered. Three Organic Rankine Cycle (ORC) power plant solutions are analysed and compared: a solution with the basic, single thermodynamic conversion cycle, one with internal heat recuperation and one with external heat recuperation. It results from the analysis that it is the proper choice of the working fluid evaporation temperature that fundamentally affects the maximum of the ORC plant output power. Application of the internal heat recuperation in the plant basic cycle results in the output power increase of approx. 5%. Addition of the external heat recuperation to the plant basic cycle, in the form of a secondary supercritical ORC power cycle can rise the output power by approx. 2%.

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