Abstract
Economic issues associated with designing deep flue gas heat recovery units for natural gas-fired boilers are examined. The governing parameter affecting the performance and cost of surface-type condensing heat recovery heat exchangers is the heat transfer surface area. When firing natural gas, the heat recovery depth depends on the flue gas temperature at the condenser outlet and determines the amount of condensed water vapor. The effect of the outlet flue gas temperature in a heat recovery heat exchanger on the additionally recovered heat power is studied. A correlation has been derived enabling one to determine the best heat recovery depth (or the final cooling temperature) maximizing the anticipated reduced annual profit of a power enterprise from implementation of energy-saving measures. Results of optimization are presented for a surface-type condensing gas–air plate heat recovery heat exchanger for the climatic conditions and the economic situation in Tomsk. The predictions demonstrate that it is economically feasible to design similar heat recovery heat exchangers for a flue gas outlet temperature of 10°С. In this case, the payback period for the investment in the heat recovery heat exchanger will be 1.5 years. The effect of various factors on the optimal outlet flue gas temperature was analyzed. Most climatic, economical, or technological factors have a minor effect on the best outlet temperature, which remains between 5 and 20°С when varying the affecting factors. The derived correlation enables us to preliminary estimate the outlet (final) flue gas temperature that should be used in designing the heat transfer surface of a heat recovery heat exchanger for a gas-fired boiler as applied to the specific climatic conditions.
| Original language | English |
|---|---|
| Pages (from-to) | 680-685 |
| Number of pages | 6 |
| Journal | Thermal Engineering |
| Volume | 64 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 1 Sep 2017 |
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Keywords
- energy saving
- fuel gases
- heat recovery
- optimization
- surface heat exchanger
- water vapor condensation
ASJC Scopus subject areas
- Nuclear Energy and Engineering
- Energy Engineering and Power Technology
Cite this
Investigation and optimization of the depth of flue gas heat recovery in surface heat exchangers. / Bespalov, V. V.; Melnikov, D. V.
In: Thermal Engineering, Vol. 64, No. 9, 01.09.2017, p. 680-685.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Investigation and optimization of the depth of flue gas heat recovery in surface heat exchangers
AU - Bespalov, V. V.
AU - Melnikov, D. V.
PY - 2017/9/1
Y1 - 2017/9/1
N2 - Economic issues associated with designing deep flue gas heat recovery units for natural gas-fired boilers are examined. The governing parameter affecting the performance and cost of surface-type condensing heat recovery heat exchangers is the heat transfer surface area. When firing natural gas, the heat recovery depth depends on the flue gas temperature at the condenser outlet and determines the amount of condensed water vapor. The effect of the outlet flue gas temperature in a heat recovery heat exchanger on the additionally recovered heat power is studied. A correlation has been derived enabling one to determine the best heat recovery depth (or the final cooling temperature) maximizing the anticipated reduced annual profit of a power enterprise from implementation of energy-saving measures. Results of optimization are presented for a surface-type condensing gas–air plate heat recovery heat exchanger for the climatic conditions and the economic situation in Tomsk. The predictions demonstrate that it is economically feasible to design similar heat recovery heat exchangers for a flue gas outlet temperature of 10°С. In this case, the payback period for the investment in the heat recovery heat exchanger will be 1.5 years. The effect of various factors on the optimal outlet flue gas temperature was analyzed. Most climatic, economical, or technological factors have a minor effect on the best outlet temperature, which remains between 5 and 20°С when varying the affecting factors. The derived correlation enables us to preliminary estimate the outlet (final) flue gas temperature that should be used in designing the heat transfer surface of a heat recovery heat exchanger for a gas-fired boiler as applied to the specific climatic conditions.
AB - Economic issues associated with designing deep flue gas heat recovery units for natural gas-fired boilers are examined. The governing parameter affecting the performance and cost of surface-type condensing heat recovery heat exchangers is the heat transfer surface area. When firing natural gas, the heat recovery depth depends on the flue gas temperature at the condenser outlet and determines the amount of condensed water vapor. The effect of the outlet flue gas temperature in a heat recovery heat exchanger on the additionally recovered heat power is studied. A correlation has been derived enabling one to determine the best heat recovery depth (or the final cooling temperature) maximizing the anticipated reduced annual profit of a power enterprise from implementation of energy-saving measures. Results of optimization are presented for a surface-type condensing gas–air plate heat recovery heat exchanger for the climatic conditions and the economic situation in Tomsk. The predictions demonstrate that it is economically feasible to design similar heat recovery heat exchangers for a flue gas outlet temperature of 10°С. In this case, the payback period for the investment in the heat recovery heat exchanger will be 1.5 years. The effect of various factors on the optimal outlet flue gas temperature was analyzed. Most climatic, economical, or technological factors have a minor effect on the best outlet temperature, which remains between 5 and 20°С when varying the affecting factors. The derived correlation enables us to preliminary estimate the outlet (final) flue gas temperature that should be used in designing the heat transfer surface of a heat recovery heat exchanger for a gas-fired boiler as applied to the specific climatic conditions.
KW - energy saving
KW - fuel gases
KW - heat recovery
KW - optimization
KW - surface heat exchanger
KW - water vapor condensation
UR - http://www.scopus.com/inward/record.url?scp=85028075940&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85028075940&partnerID=8YFLogxK
U2 - 10.1134/S0040601517090026
DO - 10.1134/S0040601517090026
M3 - Article
VL - 64
SP - 680
EP - 685
JO - Thermal Engineering (English translation of Teploenergetika)
JF - Thermal Engineering (English translation of Teploenergetika)
SN - 0040-6015
IS - 9
ER -