Experimental Investigation on Improving the Removal Effect of WFGD System on Fine Particles by Heterogeneous Condensation

Bao, Jianchun; Yang, Linjun; Yan, Jun; Xiong, Guilong; Shen, Xiangqian

doi:10.1007/978-3-642-30445-3_92

Cited by 6 publications

(6 citation statements)

References 14 publications

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“…This technology has been applied into an industrial ammoniabased wet flue gas desulfurization (WFGD) system with the flue gas scale of 50 × 10 4 Nm 3 /h, and the fine particle emissions were reduced by 30−50%. 10 There are some factors concerned with the growth of fine particles in a supersaturated environment, including the particulate composition, the residence time, the initial particle size, the supersaturation degree, etc. 11,12 According to the equation given by the classical nucleation theory, the growth of fine particles is exponentially related to the degree of supersaturation.…”

Section: Introductionmentioning

confidence: 99%

Study on Effects of Different Carrier Gases on Characteristics of the Supersaturated Environment in the One-/Multi-section Growth Tube

Zhang

et al. 2018

Energy Fuels

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The supersaturation profiles in the one-/multi-section growth tube were predicted under the conditions of different carrier gases for two kinds of typical supersaturation-achieving methods. The results show that Lewis number (Le) of the carrier gas is an important factor affecting the supersaturation profiles. For the one-section growth tube, the carrier gas with a smaller Le is beneficial to a higher level and flatter trend of supersaturation profiles for method 1, where the supersaturated environment is achieved by a cool saturated flow into a warm-walled growth tube. However, for the carrier gas of a larger Le, the higher level but less stable supersaturation profiles are presented from method 2, with a warm saturated flow into a cold-walled growth tube. With the carrier gas of large Le (>1) from method 1 and the carrier gas of small Le (<0.5) from method 2, an efficient supersaturated environment cannot be achieved under the ordinary conditions. In the multi-section growth tube, the more minimum number of the sections is selected for stable supersaturation profiles with the carrier gas of larger Le. Additionally, the sections of a flatter supersaturated environment are closely related to the achieving methods of a supersaturation environment, the whole length of the growth tube, and radial positions.

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Section: Introductionmentioning

confidence: 99%

Study on Effects of Different Carrier Gases on Characteristics of the Supersaturated Environment in the One-/Multi-section Growth Tube

Zhang

et al. 2018

Energy Fuels

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“…Bao investigated the removal performance of the WFGD system for sulfuric acid droplets by adding steam to the desulfurized flue gas to establish a supersaturated vapor environment. The results indicate that a higher degree of supersaturation will lead to larger condensation‐grown droplets, and then the enlarged droplets can be removed by a wire mesh demister more effectively . Yan studied the formation of supersaturated vapor environments in the desulfurization tower by numerical calculations and found that a supersaturated vapor environment can be obtained by increasing the moisture content of inlet flue gas .…”

Section: Introductionmentioning

confidence: 99%

Improving the removal efficiency of sulfuric acid droplets from flue gas using heterogeneous vapor condensation in a limestone‐gypsum desulfurization process

Hao

Pan

Bao

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND: Emissions of sulfuric acid droplets have caused many problems. Improving the removal efficiency of sulfuric acid droplets is of great importance. A novel process based on heterogeneous vapor condensation was proposed in this paper to improve the removal efficiency of sulfuric acid droplets in a limestone-gypsum desulfurization process. RESULTS:The results indicated that the sulfuric acid droplets were relatively easily activated in a supersaturated vapor environment and condensed into larger droplets. The removal efficiency of sulfuric acid droplets in a wet flue gas desulfurization (WFGD) system could be significantly improved. The improvements were mainly related to the inlet flue gas moisture content and temperature. A relatively higher moisture content and lower temperature of inlet flue gas improved the removal performance. Moreover, the liquid-to-gas ratio and the SO 3 concentration also contributed to the improvement in removal efficiency. However, a higher temperature of the desulfurization slurry was unfavorable. CONCLUSION: The novel process based on heterogeneous vapor condensation is suitable for industrial application. The removal efficiency of sulfuric acid droplets can be improved from 30 ∼ 40% to greater than 60%.

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“…Therefore, more fine particles would be collected by the ESP. However, because many of the removed fine particles were lightweight sub-micrometer particles, 23 the downward trend in the number concentration of fine particle emission was more obvious than that of the mass concentration. For the removal performance of the WFGD, it can be seen in panels a and b of Figure 8 that the number concentration of fine particles at the WFGD outlet decreased from 5.1 × 10 7 to 2.4 × 10 7 cm −3 , while the mass concentration decreased from 27.6 to 16.6 mg Nm −3 .…”

Section: Energy and Fuelsmentioning

confidence: 99%

Abatement of Fine Particle Emissions from a Coal-Fired Power Plant Based on the Condensation of SO₃ and Water Vapor

et al. 2017

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A new process was proposed to reduce fine particle emissions in coal-fired flue gases via the condensation of SO3 and water vapor. In this new process, hot atomized water was sprayed before the electrostatic precipitator (ESP) system to decrease the flue gas temperature and increase the flue gas humidity, causing the flue gas temperature to drop below the acid dew point; thus, SO3 would condense on the particle surfaces ahead of the ESP, which would enhance the fine particle removal efficiency of the ESP. Then, a fluoroplastic heat exchanger was located between the ESP and the wet flue gas desulfurization (WFGD) system to make the WFGD inlet flue gas temperature decrease further at a high humidity, leading to the condensation of water vapor on the particle surfaces in the desulfurization scrubber, which would improve the removal efficiency of the WFGD. The feasibility of this new process was analyzed by numerical calculation, and the results showed that the new process was feasible for the original flue gas with high SO3 concentrations, high temperature, and high humidity. The effectiveness of this new process under typical operating conditions was also presented. Furthermore, the influence of several main parameters, such as the SO3 concentration of original flue gas, the temperature drop of flue gas before the ESP, and the temperature of flue gas at the WFGD inlet, were also investigated. The results indicated that the fine particle emissions in the final exhausted flue gas would be reduced by 50–70% with this new process.

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Experimental Investigation on Improving the Removal Effect of WFGD System on Fine Particles by Heterogeneous Condensation

Cited by 6 publications

References 14 publications

Study on Effects of Different Carrier Gases on Characteristics of the Supersaturated Environment in the One-/Multi-section Growth Tube

Study on Effects of Different Carrier Gases on Characteristics of the Supersaturated Environment in the One-/Multi-section Growth Tube

Improving the removal efficiency of sulfuric acid droplets from flue gas using heterogeneous vapor condensation in a limestone‐gypsum desulfurization process

Abatement of Fine Particle Emissions from a Coal-Fired Power Plant Based on the Condensation of SO₃ and Water Vapor

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Experimental Investigation on Improving the Removal Effect of WFGD System on Fine Particles by Heterogeneous Condensation

Cited by 6 publications

References 14 publications

Study on Effects of Different Carrier Gases on Characteristics of the Supersaturated Environment in the One-/Multi-section Growth Tube

Study on Effects of Different Carrier Gases on Characteristics of the Supersaturated Environment in the One-/Multi-section Growth Tube

Improving the removal efficiency of sulfuric acid droplets from flue gas using heterogeneous vapor condensation in a limestone‐gypsum desulfurization process

Abatement of Fine Particle Emissions from a Coal-Fired Power Plant Based on the Condensation of SO3 and Water Vapor

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Abatement of Fine Particle Emissions from a Coal-Fired Power Plant Based on the Condensation of SO₃ and Water Vapor