Abstract
In order to study how deep we can reduce the temperature of exhaust flue gas, an experiment focusing on the combined influence of ash deposition and acid condensation on the heat transfer characteristics of the heat exchanger was carried out in a 300-MW boiler unit. An annular tube was inserted into the flue gas duct between the air preheater and the electrostatic precipitator. The water with given temperature firstly entered the inner tube and then flowed into the outer tube at the end of the inner tube. It is found that heat transfer performance drops sharply at fixed temperature range under given coal quality. The turning temperature is defined as the engineering acid dew temperature (EADT). When the inlet water temperature is under the EADT, ash sticks to the tube and is difficult to blow off, and thus the flow resistance rises. Furthermore, the corrosion can be observed obviously. From the point of economy and reliability, EADT is the limitation for flue gas heat recovery. The EADT is at least 30 °C lower than ADT calculated by traditional empirical and theoretical equations.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Britain Petroleum Company (2013) BP statistical review of world energy, London
Zhang FW (2010) Application of exhaust gas surplus heat of boiler. Electr Power Sur Des 4:48–52
Hwang K, Song CH, Saito K et al (2010) Experimental study on titanium heat exchanger used in a gas fired water heater for latent heat recovery. Appl Therm Eng 30:2730–2737
Li Y, Wu B, Xu XC (1997) Effect of SO2, SO3 and H2O on dew point flue gas. Acta Sci Circ 17:126–130
Müller PA (1959) Contribution to the problem of the action of sulfuric acid on the dew point temperature of flue gases. Chem Eng Technol 31:345–350
Jia MS, Ling CM (2003) Influencing factors and calculation methods of flue gas acid dew point temperature. Ind Boil 6:31–35
Kiyoura R (1972) Measurement of dew point of gases containing low concentrations of H2SO4. Bull Tokyo Inst Technol 108:165
Verhoff FH, Banchero JT (1974) Predicting dew points of flue gases. Chem Eng Prog 70:71–72
Okkes AG (1987) Get acid dew point of flue gas. Hydro Process 66:53–55
Cen KF, Fan JR (1994) Principle and calculation to prevent plugging, slagging. Eros Corros Boil Heat Exch 21:34–36
Bahadori A (2011) Estimation of combustion flue gas acid dew point during heat recovery and efficiency gain. Appl Therm Eng 31:1457–1462
ZareNezhad B, Aminian A (2010) A multi-layer feed forward neural network model for accurate prediction of flue gas sulfuric acid dew points in process industries. Appl Therm Eng 30:692–696
Wen JP (1994) Technological analysis of domestic and foreign flue gas acid dewpoint meters. J JS Univ Sci Tech 15:18–21
Chen JY (1994) Heat pipe acid dewpoint meter experimental research. J JS Univ Sci Tech 13:11–15
Zhao ZJ, Lu FS, Zhang SQ et al (2007) New-type steam air heater and the application of it’s automatic control device. Electr Power 40:54–56
Wang YG, Zhao QY (2013) Mechanism research on coupling effect between dew point corrosion and ash deposition. Appl Therm Eng 54:102–110
Acknowledgments
This work was supported by the National Basic Research Program of China (2011CB710702) and Shandong Provincial Science and Technology Development Plan (2012GGE27012).
Author information
Authors and Affiliations
Corresponding author
Additional information
SPECIAL TOPIC: Deep Utilization of Boiler Low-Temperature Flue Gas
About this article
Cite this article
Shi, Y., Zhang, X., Li, F. et al. Engineering acid dew temperature: the limitation for flue gas heat recovery. Chin. Sci. Bull. 59, 4418–4425 (2014). https://doi.org/10.1007/s11434-014-0577-y
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11434-014-0577-y