Abstract

The enamel heat pipe exchanger (EHPE) is a promising technology for waste heat recovery of coal-fired flue gas due to its abilities to resist acid corrosion, erosive wear, and ash deposit. This article presents a techno-economic assessment of EHPE based on an existing 135 t/h combined heat and power plant (CHP). The results indicated that over the 50–70 °C exhaust temperature range of flue gas, the application of EHPE could obviously improve the energy efficiency and slightly promote the exergy efficiency. The energy and exergy efficiencies gradually increase with the decrease in the exhaust temperature. However, the increased revenue by fuel saving could be totally offset by the decreased revenue in electricity selling. The net annual revenue would probably turn to be negative when coal price is low and electricity price is relatively high. One should pay more attention to the economic aspects for the application of EHPE.

References

References
1.
Zhao
,
S.
,
Wang
,
W.
, and
Ge
,
Z.
,
2020
, “
Energy and Exergy Evaluations of a Combined Heat and Power System With a High Back-Pressure Turbine Under Full Operating Conditions
,”
Energies
,
13
(
17
), pp.
4484
4501
. 10.3390/en13174484
2.
Wang
,
C.
,
He
,
B.
,
Sun
,
S.
,
Wu
,
Y.
,
Yan
,
N.
,
Yan
,
L.
, and
Pei
,
X.
,
2012
, “
Application of a Low Pressure Economizer for Waste Heat Recovery From the Exhaust Flue Gas in a 600 MW Power Plant
,”
Energy
,
48
(
1
), pp.
196
202
. 10.1016/j.energy.2012.01.045
3.
Xu
,
G.
,
Huang
,
S.
,
Yang
,
Y.
,
Wu
,
Y.
,
Zhang
,
K.
, and
Xu
,
C.
,
2013
, “
Techno-Economic Analysis and Optimization of the Heat Recovery of Utility Boiler Flue Gas
,”
Appl. Energy
,
112
, pp.
907
917
. 10.1016/j.apenergy.2013.04.048
4.
Buchta
,
J.
, and
Oziemski
,
A.
,
2019
, “
Flue Gas Heat Recovery in High Efficient Coal-Fired Power Plant
,”
Proceeding 2019 20th International Scientific Conference on Electric Power Engineering EPE 2019
,
Kouty nad Desnou, Czech Republic
,
May 15–17
, pp.
1
6
.
5.
Jouhara
,
H.
,
Almahmoud
,
S.
,
Chauhan
,
A.
,
Delpech
,
B.
,
Bianchi
,
G.
,
Tassou
,
S. A.
,
Llera
,
R.
,
Lago
,
F.
, and
Arribas
,
J. J.
,
2017
, “
Experimental and Theoretical Investigation of a Flat Heat Pipe Heat Exchanger for Waste Heat Recovery in the Steel Industry
,”
Energy
,
141
, pp.
1928
1939
. 10.1016/j.energy.2017.10.142
6.
Chen
,
H.
,
Zhou
,
Y.
,
Cao
,
S.
,
Li
,
X.
,
Su
,
X.
,
An
,
L.
, and
Gao
,
D.
,
2017
, “
Heat Exchange and Water Recovery Experiments of Flue Gas With Using Nanoporous Ceramic Membranes
,”
Appl. Therm. Eng.
,
110
, pp.
686
694
. 10.1016/j.applthermaleng.2016.08.191
7.
Garlapalli
,
R. K.
,
Spencer
,
M. W.
,
Alam
,
K.
, and
Trembly
,
J. P.
,
2018
, “
Integration of Heat Recovery Unit in Coal Fired Power Plants to Reduce Energy Cost of Carbon Dioxide Capture
,”
Appl. Energy
,
229
, pp.
900
909
. 10.1016/j.apenergy.2018.08.031
8.
Song
,
G.
,
Xiao
,
J.
,
Zhao
,
H.
, and
Shen
,
L.
,
2012
, “
A Unified Correlation for Estimating Specific Chemical Exergy of Solid and Liquid Fuels
,”
Energy
,
40
(
1
), pp.
164
173
. 10.1016/j.energy.2012.02.016
9.
Bahadori
,
A.
,
2011
, “
Estimation of Combustion Flue Gas Acid Dew Point During Heat Recovery and Efficiency Gain
,”
Appl. Therm. Eng.
,
31
(
8–9
), pp.
1457
1462
. 10.1016/j.applthermaleng.2011.01.020
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