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Publication Title | Supercritical CO2 Power Cycle Symposium 2014

Organic Rankine Cycle

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Supercritical CO2 Power Cycle Symposium September 9 - 10, 2014 Pittsburg, Pennsylvania USA

Study of a Supercritical CO2 Power Cycle Application in a Cogeneration Power Plant

Dr. Leonid Moroz, Dr. Maksym Burlaka, Dr. Oleksii Rudenko

SoftInWay Inc.

15 New England Executive Park Burlington, MA 01803, USA

Email: l.moroz@softinway.com, m.burlaka@softinway.com, o.rudenko@softinway.com

Abstract

Cogeneration,orcombined heat and power(CHP), is the use of aheat engineorpower stationto simultaneously generate electricity and useful heat. Cogeneration is considered as a thermodynamically efficient use of fuel [1]. In separate productions of electricity, some energy must be discarded as waste heat, but in cogeneration this thermal energy is put to use. Usually the CHP plant uses steam as the working fluid and has a flexible ratio of cogeneration, which depends on the season.

In turn, supercritical CO2 (S-CO2) power cycles are proposed for future energy applications because of their high thermal efficiency [2]. However, the possibilities of carbon dioxide applications as working fluids for cogeneration power plants have never been published or expanded on.

This paper considers several S-CO2 cycles in terms of application in a CHP plant. Combined steam/S- CO2 cycles are also proposed and described, though the S-CO2 cycles are used as “bottom” cycles which only turn on when heat production is not required. The performance of several standalone cycles and combined steam/S-CO2 cycles are compared with typical steam cogeneration cycle performances. Combined steam/S-CO2 cycles, steam turbine and S-CO2 turbine features are considered.

Introduction

Supercritical CO2 operating in a closed-loop recompression Brayton cycle has the potential of equivalent or higher cycle efficiency versus supercritical or superheated steam cycles at similar temperatures [2]. The current applications of the supercritical CO2 Brayton cycle are intended for the electricity production only and the questions which are related to the building of CHP plants based on Supercritical CO2 technology were not considered yet.

CHP is the concurrent production of electricity or mechanical power and useful thermal energy (heating and/or cooling) from a single source of energy. CHP is a type of distributed generation, which, unlike central station generation, is located at located at or near the point of consumption. Instead of purchasing electricity from a local utility and then burning fuel in a furnace or boiler to produce thermal energy, consumers use CHP to improve efficiency and reduce greenhouse gas (GHG) emissions. For optimal efficiency, CHP systems typically are designed and sized to meet the users' thermal base load demand. CHP is not a single technology but a suite of technologies that can use a variety of fuels to generate electricity or power at the point of use, allowing the heat that would normally be lost in the power

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