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Heat and Mass Transfer

, Volume 50, Issue 8, pp 1081–1090 | Cite as

Preliminary thermodynamic study for an efficient turbo-blower external combustion Rankine cycle

  • Manuel Romero GómezEmail author
  • Javier Romero Gómez
  • Ramón Ferreiro Garcia
  • Álvaro Baaliña Insua
Original
  • 175 Downloads

Abstract

This research paper presents a preliminary thermodynamic study of an innovative power plant operating under a Rankine cycle fed by an external combustion system with turbo-blower (TB). The power plant comprises an external combustion system for natural gas, where the combustion gases yield their thermal energy, through a heat exchanger, to a carbon dioxide Rankine cycle operating under supercritical conditions and with quasi-critical condensation. The TB exploits the energy from the pressurised exhaust gases for compressing the combustion air. The study is focused on the comparison of the combustion system’s conventional technology with that of the proposed. An energy analysis is carried out and the effect of the flue gas pressure on the efficiency and on the heat transfer in the heat exchanger is studied. The coupling of the TB results in an increase in efficiency and of the convection coefficient of the flue gas with pressure, favouring a reduced volume of the heat exchanger. The proposed innovative system achieves increases in efficiency of around 12 % as well as a decrease in the heat exchanger volume of 3/5 compared with the conventional technology without TB.

Keywords

Heat Exchanger Convection Heat Transfer Coefficient Combustion System Rankine Cycle Turbo Compressor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

A

Heat transfer area (m2)

Cp

Specific heat at constant pressure (J/kg K)

d

Diameter (m)

de

Equivalent diameter (m)

f

Friction factor (dimensionless)

G

Mass flow rate per area unit (kg/m2 s)

h

Specific enthalpy (kJ/kg)

H

Convection heat transfer coefficient (W/m2 K)

\(\overline{h}\)

Molar specific enthalpy (kJ/kmol)

k

Thermal conductivity (W/mK)

\(\mathop m\limits^{ \cdot }\)

Mass flow rate (kg/s)

np

Moles of combustion products

nr

Moles of combustion reactants

Nb

Baffles number (dimensionless)

Np

Number of tube passes (dimensionless)

p

Pressure (bar)

q

Specific heat (kJ/kg)

\(\mathop Q\limits^{ \cdot }\)

Heat transfer rate (kW)

Re

Reynolds number (dimensionless)

T

Temperature (°C)

U

Overall heat transfer coefficient (W/m2K)

um

Mean velocity (m/s)

w

Specific work (kJ/kg)

x

Excess air rate (%)

Δpi

Total pressure drop at the tube inside (Pa)

Δps

Pressure drop at the shell side (Pa)

ΔTLM

Logarithmic mean temperature difference (°C)

Abbreviations

LHV

Lower heating value

SRC

Supercritical Rankine cycle

TB

Turbo-blower

TIT

Turbine inlet temperature

Greek symbols

Β

Air–fuel ratio

ε

Effectiveness (dimensionless)

p

Density (kg/m3)

μ

Dynamic viscosity (Pa s)

η

Thermal efficiency

ηov

Overall efficiency

ηmec

Mechanical efficiency

ηalt

Alternator efficiency

ηcomb

Combustion efficiency

Subscripts

c

Ceramic

f

Fuel

i

Tube inside

in

Inlet

g

Flue gas

o

Tube outsider

out

Outlet

s

Heat exchanger shell

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Manuel Romero Gómez
    • 1
    Email author
  • Javier Romero Gómez
    • 1
  • Ramón Ferreiro Garcia
    • 2
  • Álvaro Baaliña Insua
    • 1
  1. 1.Department of Energy and Marine Propulsion, ETSNMUniversity of A CoruñaA CoruñaSpain
  2. 2.Department of Industrial Engineering, ETSNMUniversity of A CoruñaA CoruñaSpain

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