Reduction of dust deposition in air-cooled condensers in thermal power plants by Ni–P-based coatings

Abstract

One of the largest problems with most current thermal power plants is the cooling efficiency. This paper aims to massively reduce fuel consumption and heat wasted in thermal power plants and hence CO2 emissions by resolving fouling issues associated with air-cooled condensers. In order to reduce the dust fouling deposition in the air-cooled condensers, the finned flat tubes were coated with nickel−phosphorus and nickel−phosphorus−polytetrafluoroethylene (Ni–P-PTFE) by an electroless coating technology. The anti-fouling performance of the coated tubes was investigated using the field operation parameters of air-cooled condensers, and the influence of the surface energies of the coatings on the dust adhesion was also investigated. The results demonstrated that the Ni–P coated finned tubes performed best, which reduced fouling resistance by 83.3% compared with the untreated finned tubes. The Ni–P coatings have potential applications in thermal power plants for reducing heat exchanger fouling and hence significantly decreasing waste heat and CO2 emissions.

Graphic abstract

Introduction

Fouling of heat exchangers in processing industries is a chronic operational problem that compromises energy recovery and environmental welfare (Rammerstorfer E et al. 2019). Fouling on the surfaces of heat exchangers acts as a thermal insulator, resulting in significant loss of heat transfer, the increased consumption of fuels and CO2 emissions. Studies have shown that heat exchanger fouling may contribute up to 2.5% of global CO2 emissions, while reducing the global gross domestic product (GDP) by 0.25% (Byers et al. 2014). Based on 2017 GDP data, heat exchanger fouling costs the UK $6.5 billion per year and China $32 billion a year. Globally, 80% of electricity generation comes from thermo-electric power stations using carbonaceous fuels (coal and gas) and nuclear (Casanueva-Robles et al. 2016). The UK electricity mix is dominated by thermo-electric generation capacity which contributes to 90% of the ~ 380 TWh generated each year (Byers et al. 2014). The power station sector is responsible for 32% of the UK’s CO2 emissions and has been identified as a key component of the UK’s efforts to reduce emissions by 80% by 2050, a legally binding target of the Climate Change Act 2008 (Byers et al. 2014). The dielectric barrier discharge plasma reactor has a significant reduction effect on the concentration of carbon dioxide (Abedi-Varaki 2017).

Air-cooled condensers (ACCs) with finned flat tubes are broadly applied in thermal power plant for the purpose of exhaust steam condensation in thermal power plants. However, due to the compact structure of ACCs and the high dust concentration of cooling air, the finned flat tubes are usually prone to fouling on the surfaces of the fin side, as shown in Fig. 1. Dust fouling not only reduces heat transfer coefficient, but also blocks cooling air channel, ultimately resulting in higher energy consumption ( Yang et al. 2012). To reduce the influence of fouling on the heat transfer capacity of ACCs, many attempts have been made to improve the efficacy of ACCs. Numerical modelling is usually used to optimize the design of heat exchanger parameters and improve heat exchange efficiency (Lenhard et al. 2019). The optimized design can improve the heat transfer efficiency to a certain extent (Müller-Steinhagen et al. 2007). It is has been demonstrated that the staggered finned tubes can reduce pressure loss and improve heat transfer efficiency (Wu et al. 2012). However, these finned tubes are more prone to fouling due to the small fin spacing (Bell et al. 2011). To accommodate the reduction in heat transfer capacity due to dust fouling, ACCs are generally designed with an excess heat transfer surface area and the finned tubes must be frequently cleaned with high-pressure demineralized water. These countermeasures increase investment costs and the water consumption of power plants in drought areas.

Fig. 1
figure1

The finned flat tubes of air-cooled condenser: a heat transfer process; b structure parameters

Many attempts have been made to investigate the adhesion mechanisms of dust particles on heat transfer surfaces. Ni et al. (2018) explained the particle adhesion behavior on the surface of lump coal by the Deryagin, Landau, Verwey and Overbeek (DLVO) theory. They found that the total interaction energy was inversely proportional to the amount of adhered deposit. Zou et al. (2018) used the extended DLVO theory to explore the interfacial interaction between coal and the main impurity mineral particles in application of selective flocculation flotation. It has been shown that in the initial ash deposition stage, the length of the induction period depended on the energy barrier (Zhang et al. 2019). The dust particles that are adsorbed on the surface need to cross the energy barrier (Harimawan et al. 2013). During attraction, the electrostatic double-layer force component is the main influencing factor (Liang et al. 2019) and the zeta potential determines the energy barrier level (Yu et al. 2018). Some experimental studies have shown that the surface roughness also affects the energy barrier level (Gungoren et al. 2020), which is the main factor that affects the induction period of the ash deposition process.

It is much more desirable if the surfaces of finned tubes can be modified via a coating with low fouling properties (Zhang et al. 2018). Many attempts have been made to reduce crystalline fouling and biofouling via the application of surface coatings. Cheng et al. (2014) demonstrated that the addition of PTFE to the Ni-Cu-P composite coating inhibits mineral fouling accumulation. Zhao et al. (2005) also demonstrated that the Ni-Cu-P-PTFE composite coating inhibits both biofouling and mineral fouling on heat exchanger surfaces. Matjie et al. (2016) demonstrated that the coating with the optimal surface energy minimizes the aluminum silicate deposits. Liu et al. (2011a, b) found that the surface energy components CQ ratio has a strong correlation with fouling adhesion.

The accumulation of dust particles on the surfaces of the finned tubes reduced the efficiency of the heat exchangers. No study has been reported on the reduction of dust fouling with Ni–P coatings. As Ni–P coating is metal based, it has very good thermal conductivity which is similar to steel. The Ni–P-based coating has very good durability and anti-corrosion properties, which is suitable for heat exchange application (Hadzima et al. 2007). However, to the best of the authors’ knowledge, there have no applications of Ni–P-based coatings on the finned tubes to reduce the dust fouling of ACCs. The objective of this paper is to optimize the surface energy of finned flat tubes of ACCs by a Ni–P-based coating technology to mitigate the dust fouling deposition. If successful, it will significantly reduce the waste heat and CO2 emissions of heat exchangers in thermal power plants.

Experimental procedure

Preparation of coatings on finned flat tube

To investigate the effect of the surface properties of the coatings on dust fouling adhesion, Ni–P-based composite coatings were prepared on the fin side of the tube bundles (50 mm length × 220 mm width × 57 mm thickness) using an electroless plating technology. The procedures and operation conditions for the electroless Ni–P and Ni–P-PTFE composite coatings are listed in Table 1. The sample needs to be rinsed at room temperature before and after each operation.

Table 1 Pretreatment and coating procedures of electroless Ni–P and Ni–P-PTFE coatings

The 60 wt% PTFE emulsion with a particle size in the range of 0.05–0.5 µm (purchased from Zhanyang Polymer Materials CO., LTD, Dongguan, China) was diluted with demineralized water and stirred with a magnetic stirrer for 45 min. During the coating process, the PTFE particles were incorporated into the Ni–P matrix. The compositions and the plating conditions are listed in Table 2. The surface energy of the coatings was changed by changing the concentration of PTFE in the plating solutions. The thickness of the coatings was measured using an X-ray Thickness Gauge. The surface morphology and composition of the coatings were analyzed using a scanning electron microscope (SEM). The thickness of the coatings was controlled by the deposition time.

Table 2 Composition and conditions for electroless Ni–P and Ni–P-PTFE coatings

Experimental system

For initial screening tests, the air-cooled finned tubes were cut into 50-mm-long segments and then were coated with Ni–P and Ni–P-PTFE, respectively. The water circulation circuit consisted of a heating source, circulation pumps and rubber pipes. The hot water originated from the heating tube in the boiler system and the heating source was a 1.5 kW thermostatic water bath. The water temperature was maintained at 54 °C. The finned tubes were connected to a circulating pump with a power of 160 W. The cooling air driven by an axial flow fan was removed through vertically arranged finned tubes. The wind speed was detected by an air speed sensor installed at the exit of the finned tubes. The fan speed was controlled by a frequency converter to simulate a 2 m/s wind speed and generate a 2m3/s volume flow at the operating site. The frequency converter was adjusted to 45 Hz and could simulate a 2 m/s wind speed at the outlet. The fan inverter output frequency was fixed to maintain the wind speed. Dust was continuously sprayed above the fan at a rate of 15 mg/s to maintain the dust concentration at 7.5 mg/m3. K-type thermocouple temperature sensors were installed at the air inlet of the axial flow fan, on the side of the fin tube outlet and on the water inlet and outlet of the fin tubes to measure the wind and water temperatures. The measurements of temperature profiles at different locations are critical for the deposition of ash particles (Jandacka et al. 2017). Temperature data was collected and recorded by a paperless recorder. A computer-controlled data acquisition system regularly read the temperature data. The heat transfer coefficient and thermal resistance were calculated and saved in an Excel table. The experimental system diagram is illustrated in Fig. 2.

Fig. 2
figure2

Experimental system: a Schematic diagram; b experimental facilities

Ash particles

Because the use of the ash from thermal power plant (the actual area) is not practical, the artificial ash (experimental ash) was used. In order to remove larger fibers, a sieve (100 μm diameter) was used to filter the experimental dust. Energy-dispersive X-ray spectroscopy (EDX) was used for the component and particle size analysis of the dust sample. Figure 3(a) shows the comparison of the main components and proportions of the ash from a local thermal power plant with the artificial ash. There were no significant differences in the components and proportions between the two types of ash. The average particle size of the ash from the actual area was around 15 μm, and the average size of experimental ash particles was also around 15 μm, as shown in Fig. 3(b). Laser particle size analyzer (TopSizer, OMEC CO., LTD, Zhuhai, China) was used to measure the size of ash particles.

Fig. 3
figure3

a Ash components; b ash particle sizes

Analysis method

The air-cooler heat transfer coefficient was calculated according to the heat balance theory (Liu et al. 2013). When an air cooler is operated for a period of time, dust accumulates on the surfaces of the finned tubes to cause ash accumulation. The definitions of the heat transfer coefficient and the fouling resistance as well as their analysis methods are described in detail by Tang et al. (2019) and Wang et al. (2019).

Results and discussion

Surface analysis of coatings

Figure 4 shows the surface morphologies of the untreated and treated aluminum finned tubes. Figure 4a shows the SEM image of an untreated aluminum finned tube. Figure 4b is the SEM image of a typical Ni–P coated finned tube, which is much smoother than the untreated finned tube. Figure 4c–f show the SEM images of Ni–P-PTFE coated finned tubes with PTFE contents 9.2%, 11.4%, 21.9% and 23.9%, respectively. The surface roughness increased slightly with increasing PTFE content.

Fig. 4
figure4

SEM images of untreated and coated finned tubes

Figure 5 shows the chemical compositions of the coatings by EDX analysis. The F element in Fig. 5(c–f) was from the PTFE particles in the Ni–P-PTFE coatings. Since the chemical formula of PTFE is -(CF2-CF2)n-, the corresponding PTFE contents in the Ni–P-PTFE coatings were calculated based on the F contents and the PTFE formula, which was 9.2%, 11.4%, 21.9% and 23.9%, respectively. The PTFE contents in the Ni–P-PTFE coatings increased with increasing PTFE concentration in the plating solution.

Fig. 5
figure5

EDX spectra of untreated and coated finned tubes

Table 3 shows the thickness of the coatings, which is in the range of 4 µm ~ 14.5 µm (measured by X-ray Thickness Gauge). The thickness of the aluminum fins was 444 µm. As the thickness of the coatings was very thin and the coatings mainly contained metal Ni–P, the additional thermal resistance of the coatings should be negligible. To verify this idea, the thermal resistance of the coatings was measured. The results indicated that the additional thermal resistance of the coatings was only increased by 0.071‰ ~ 0.32‰, which is indeed negligible.

Table 3 Characterization of coatings

The contact angles on the coatings were determined using a sessile drop technique with a contact angle instrument with a resolution of 0.5°. The four test liquids, including distilled water, diiodomethane, ethylene glycol and glycerol, were used for the contact angle measurements (Han et al. 2019). For each test liquid, 10 measurements were performed and an average value of the 10 contact angles on the coating was obtained.

Table 4 lists the contact values and surface energy components of the Ni–P coated tube, Ni–P-PTFE coated tubes with different PTFE contents, untreated aluminum tube and dust particles. In the table, the \(\gamma^{{_{{^{LW} }} }}\), \(\gamma^{{_{{^{AB} }} }}\), \(\gamma^{{_{{^{ + } }} }}\) and \(\gamma^{{_{{^{ - } }} }}\) are Lifshitz-van de Waals (LW), acid–base (AB), electron-accepter and electron-donator components of surface energy, respectively, and \(\gamma^{{_{{^{TOT} }} }}\) is the total surface energy. Clearly the total surface energy of the Ni–P-PTFE coatings decreased with PTFE content increasing.

Table 4 Contact angle and surface energy components

Dust fouling characteristics

After 168 h of ash deposition, the heat transfer coefficient and thermal resistance (also known as fouling resistance) were determined, respectively, by measuring the water temperatures and air temperatures at the inlet and the outlet. The heat transfer coefficient and thermal resistance of each coating are presented in Figs. 6 and 7, respectively. Figure 6 clearly indicates that all the coated finned tubes had much higher heat transfer coefficients than the uncoated finned tube. The Ni–P coated finned tubes performed best in inhibiting ash deposition and the heat transfer coefficient was only decreased slightly after 168 h operation, while the heat transfer coefficient of the untreated finned tubes was decreased sharply. The Ni–P coated finned tubes performed better than the Ni–P-PTFE coated tubes in the reduction of the ash accumulation, as the PTFE particles made the Ni–P-PTFE coating rougher. Figure 7 shows the comparison of fouling resistance of the Ni–P coated finned tubes with the untreated finned tubes. The fouling resistance of the untreated finned tubes increased rapidly to 0.015 m2K/W after 168 h operation, while the fouling resistance of the Ni–P coated finned tubes only increased to 0.0025 m2K/W, which was decreased by 83.3% as compared with the untreated finned tubes.

Fig. 6
figure6

Heat transfer coefficient vs time

Fig. 7
figure7

Fouling resistance vs time

Discussion

Waste heat and CO2 emissions

As carbon dioxide (CO2) is the primary greenhouse gas, this work focused on the improvement of the greenhouse effect by energy saving. Currently several techniques are available for reducing CO2 emissions. The turning of food waste into biogas via anaerobic fermentation is widely recognized as an environmentally responsible and economically reasonable option (Marouek et al. 2020). Solid biofuels also have the characteristics of reducing carbon dioxide emissions (Mardoyan et al. 2015). Biowaste collection and circular economy are closely related (Rolewicz-Kalińska et al. 2020). Meanwhile, fouling deposits on the surface of condensers/heat exchangers have a severe impact on the condenser’s ability to condense the exhaust steam, resulting in a significant increase in the amount of fuel consumption, waste energy and CO2 emissions (Byers et al. 2014). It has been demonstrated that for a 550 MW coal-fired power station, a thin layer of fouling film (0.5 mm) on heat transfer surfaces in power station steam condensers can increase waste heat by 6.3 × 1010 kJ/y and CO2 emissions by 13,728 t/y (Casanueva-Robles et al. 2016).

Recently several coal-fired power stations closed due to approaching the end of their original design life and CO2 emissions. China electricity mix is dominated by coal-fired generation capacity (3906 TWh) which contributes to 65% of the total 5983 TWh generated each year. The formation of a 0.5-mm-thick fouling film on the steam condensers in these coal-fired power stations in China can increase waste heat by 4.5 × 1017 kJ/y and CO2 emissions by 99 billion t/y, based on Casanueva-Robles and Bott’s calculation method (Casanueva-Robles et al. 2016). The experimental results in this study demonstrated that the Ni–P coated finned tubes reduced fouling resistance by 83.3% compared with the untreated finned tubes. The cost due to ash accumulation is defined as the operating economic loss caused by the increase in the exhaust pressure of the unit. Due to the increased thermal resistance by ash accumulation, the exhaust pressure of the steam turbine increases and the output power of the generator set decreases. Application of the Ni–P anti-fouling coatings to heat exchangers in thermal power plants will significantly decrease waste heat and CO2 emissions.

Surface energy and Fouling adhesion

After 168-h operation, the heat transfer coefficient decreased due to ash fouling formation on the tubes. Figure 8 shows the comparison of the reduction percentage in heat transfer coefficient of the coated finned tubes with the untreated finned tubes. Clearly, all the coated tubes have lower reduction percentage in heat transfer coefficient, compared with the untreated tube. Ni–P coated tube has the lowest reduction percentage and the untreated tube has the highest reduction percentage.

Fig. 8
figure8

Comparison of the reduction percentage in heat transfer coefficient of the coated finned tubes with the untreated finned tubes

It is well know that the surface energy components, especially the Lifshitz-van der Waals component (\(\gamma_{{}}^{LW}\)) and electron-donator component (\(\gamma^{ - }\)), have significant influence on fouling adhesion. Chen Liu and Qi Zhao found that the ratio \(\gamma_{{}}^{LW}\)/\(\gamma^{ - }\) (called as CQ ratio, which is named after the authors, Chen and Qi) determines fouling adhesion strength (Liu et al. 2011a, b) In this investigation, the surface energy components (\(\gamma_{{}}^{LW}\) and \(\gamma^{ - }\)) of the untreated aluminum fins were 34.6 mJ/m2 and 0 mJ/m2, respectively (see Table 4). After coating with Ni–P and Ni–P-PTFE, the \(\gamma_{{}}^{LW}\) and \(\gamma^{ - }\) values changed in wide range, in the ranges of 13.9–30.3 mJ/m2 and 4.5–36.4 mJ/m2, respectively (see Table 4). However, the surface energy component \(\gamma_{2}^{ + }\) value was nearly equal to zero, in the narrow range of 0.26–1.5 mJ/m2. In order to explain Fig. 8, we correlated the reduction percentage in heat transfer coefficient with the new ratio \(\gamma^{ - }\)/\(\gamma_{{}}^{LW}\)(1/CQ). The 1/CQ ratio for the coated finned tubes and the untreated finned tube is given in Table 4. Figure 9 indicates that the reduction percentage in heat transfer coefficient has a strong correlation with 1/CQ ratio, that is, the reduction percentage decreases linearly with 1/CQ ratio increasing. The results will help to design anti-fouling coatings by optimum surface energy approach through surface modification. This study did not consider the effect of surface roughness on dust deposition. This will be our next stage of work. The joint study of surface energy components and surface roughness will help us to understand the mechanism of dust deposition.

Fig. 9
figure9

Influence of 1/CQ ratio on reduction percentage in heat transfer coefficient

Conclusion

In this study, Ni–P and Ni–P-PTFE were applied to the coupons of finned tubes to investigate their effects on the anti-fouling performance. The Ni–P coated finned tubes performed best, which reduced fouling resistance by 83.3% compared with the untreated finned tubes. Both the Lifshitz-van der Waals (LW) component and electron-donator component of surface energy have significant influence on fouling adhesion. The ratio of electron-donator component to LW component (1/CQ ratio) controls the dust fouling formation and adhesion. The reduction percentage in heat transfer coefficient decreases linearly with 1/CQ ratio increasing. The Ni–P anti-fouling coatings have protentional application to heat exchangers in thermal power plants, which can significantly decrease waste heat and CO2 emissions.

References

  1. Abedi-Varaki M (2017) Study of carbon dioxide gas treatment based on equations of kinetics in plasma discharge reactor. Mod Phys Lett B 31(22):1750210

    CAS  Article  Google Scholar 

  2. Bell IH, Groll EA (2011) Air-side particulate fouling of microchannel heat exchangers: Experimental comparison of air-side pressure drop and heat transfer with plate-fin heat exchanger. Appl Therm Eng 31(5):742–749

    Article  Google Scholar 

  3. Byers EA, Hall JW, Amezagaa JM (2014) Electricity generation and cooling water use: UK pathways to 2050. Global Environ Chang 25:16–30

    Article  Google Scholar 

  4. Casanueva-Robles T, Bott TR (2016) Proceedings of 6th International Conference on Heat Exchanger Fouling and Cleaning. The Berkeley Electronic Press. 2; 278–282.

  5. Cheng YH, Chen HY, Zhu ZC, Jen TC, Peng YX (2014) Experimental study on the anti-fouling effects of Ni–Cu–P-PTFE deposit surface of heat exchangers. Appl Therm Eng 68:20–25

    CAS  Article  Google Scholar 

  6. Gungoren C, Guven O, Cinar M, Ozdemir O (2020) An investigation of the effect of clay type on coal flotation along with DLVO theoretical analyses. Int J Coal Prep Util 40(3):210–222

    CAS  Article  Google Scholar 

  7. Hadzima B, Janecek M, Estrin Y, Kim HS (2007) Microstructure and corrosion properties of ultrafine-grained interstitial free steel. Mat Sci Eng A 462(1–2):243–247

    Article  Google Scholar 

  8. Han B, Liang S, Wang B, Zheng J, Xie X, Xiao K, Wang X, Huang X (2019) Simultaneous determination of surface energy and roughness of dense membranes by a modified contact angle method. Colloid Surface A 562:370–376

    CAS  Article  Google Scholar 

  9. Harimawan A, Zhong S, Lim CT, Ting TP (2013) Adhesion of B. subtilis spores and vegetative cells onto stainless steel-DLVO theories and AFM spectroscopy. J Colloid Interf Sci 405:233–241

    CAS  Article  Google Scholar 

  10. Jandacka J, Micieta J, Holubcik M, Nosek R (2017) Experimental Determination of Bed Temperatures during Wood Pellet Combustion. Energ Fuel 31(3):2919–2926

    CAS  Article  Google Scholar 

  11. Lenhard R, Malcho M, Jandačka J (2019) Modelling of Heat Transfer in the Evaporator and Condenser of the Working Fluid in the Heat Pipe. Heat Transfer Eng 40(3–4):215–226

    CAS  Article  Google Scholar 

  12. Liang L, Tan J, Li B, Xie G (2019) Reducing quartz entrainment in fine coal flotation by polyaluminum chloride. Fuel 235:150–157

    CAS  Article  Google Scholar 

  13. Liu C, Zhao Q (2011a) Influence of surface-energy components of Ni-P-TiO2-PTFE nanocomposite coatings on bacterial adhesion. Langmuir 27:9512–9519

    CAS  Article  Google Scholar 

  14. Liu C, Zhao Q (2011b) The CQ ratio of surface energy components influences adhesion and removal of fouling bacteria. Biofouling 27:275–285

    CAS  Article  Google Scholar 

  15. Liu J, Hu Y, Zeng D, Wang W (2013) Optimization of an air-cooling system and its application to grid stability. Appl Therm Eng 61:206–212

    Article  Google Scholar 

  16. Mardoyan A, Braun P (2015) Analysis of Czech Subsidies for Solid Biofuels. Int J Green Energy 12(4):405–408

    CAS  Article  Google Scholar 

  17. Marouek J, Struneck O, Kolá L, Vochozka M (2020) Advances in nutrient management make it possible to accelerate biogas production and thus improve the economy of food waste processing. Energ Source Part A 2:1–10

    Google Scholar 

  18. Matjie R, Zhang S, Zhao Q, Mabuza N, Bunt JR (2016) Tailored surface energy of stainless steel plate coupons to reduce the adhesion of aluminium silicate deposit. Fuel 181:573–578

    CAS  Article  Google Scholar 

  19. Müller-Steinhagen H, Malayeri MR, Watkinson AP (2007) Recent Advances in Heat Exchanger Fouling Research, Mitigation and Cleaning Techniques. Heat Transfer Eng 28:173–176

    Article  Google Scholar 

  20. Müller-Steinhagen H, Malayeri MR, Watkinson AP (2011) Heat Exchanger Fouling: Environmental Impacts. Heat Transfer Eng 30:773–776

    Article  Google Scholar 

  21. Ni C, Bu X, Xia W, Peng Y, Yu H, Xie G (2018) Observing slime-coating of fine minerals on the lump coal surface using particle vision and measurement. Powder Technol 339:434–439

    CAS  Article  Google Scholar 

  22. Rammerstorfer E, Karner T, Siebenhofer M (2019) The kinetics and mechanisms of fouling in crude oil heat transfer. Heat Transfer Eng 41(2):1–17

    Google Scholar 

  23. Rolewicz-Kalińska A, Lelicińska-Serafin K, Manczarski P (2020) The Circular Economy and Organic Fraction of Municipal Solid Waste Recycling Strategies. Energies 13(17):4366

    Article  Google Scholar 

  24. Tang SZ, Li MJ, Wang FL, Liu ZB (2019) Fouling and thermal-hydraulic characteristics of aligned elliptical tube and honeycomb circular tube in flue gas heat exchangers. Fuel 251:316–327

    CAS  Article  Google Scholar 

  25. Wang FL, Tang SZ, He YL, Kulacki FA, Yu Y (2019) Heat transfer and fouling performance of finned tube heat exchangers: Experimentation via on line monitoring. Fuel 236:949–959

    CAS  Article  Google Scholar 

  26. Wu JM, Zhang H, Yan CH, Wang Y (2012) Experimental study on the performance of a novel fin-tube air heat exchanger with punched longitudinal vortex generator. Energ Convers Manage 57:42–48

    Article  Google Scholar 

  27. Yang L, Tan H, Du X, Yang Y (2012) Thermal-flow characteristics of the new wave-finned flat tube bundles in air-cooled condensers. Int J Therm Sci 53:166–174

    Article  Google Scholar 

  28. Yu Y, Ma L, Xu H, Sun X, Zhang Z, Ye G (2018) DLVO theoretical analyses between montmorillonite and fine coal under different pH and divalent cations. Powder Technol 330:147–151

    CAS  Article  Google Scholar 

  29. Zhang C, Zhong L, Wang J (2018) Decoupling between water use and thermoelectric power generation growth in China. Nat Energy 3:792–799

    Article  Google Scholar 

  30. Zhang XY, Zhou XT, Xi HP, Sun JX, Liang XL, Wei J, Xiao X, Liu ZG, Li SW, Liang ZS, Chen YY, Wu ZR (2019) Interpretation of adhesion behaviors between bacteria and modified basalt fiber by surface thermodynamics and extended DLVO theory. Colloid Surface B 177:454–461

    CAS  Article  Google Scholar 

  31. Zhao Q, Liu Y, Wang S, Müller-Steinhagen H (2005) Effect of surface free energy on the adhesion of biofouling and crystalline fouling. Chem Eng Sci 60(17):4858–4865

    CAS  Article  Google Scholar 

  32. Zou W, Zhao J, Sun C (2018) Adsorption of Anionic Polyacrylamide onto Coal and Kaolinite Calculated from the Extended DLVO Theory Using the van Oss-Chaudhury-Good Theory. Polymers-Basel 10(2):113

    Article  Google Scholar 

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Acknowledgements

This work was supported by the Science and Technology Development Plan of Jilin Province (Grant No. 20190201098JC).

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Zhao, B., Wang, X., Xu, Y. et al. Reduction of dust deposition in air-cooled condensers in thermal power plants by Ni–P-based coatings. Clean Techn Environ Policy (2021). https://doi.org/10.1007/s10098-021-02055-6

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Keywords

  • Thermal power plants
  • Heat exchanger
  • Fouling
  • Dust deposition
  • Coatings
  • CO2 emissions