The study of evaporation characteristics of the desulfurization wastewater (electrolyte solution) droplet

Liang, Zhengxing; Yan, Yanan; Yan, Junhao; Lee, Timothy H.; Yang, Zhongqing; Zhang, Li; Lee, Chia-fon F.

doi:10.1016/j.applthermaleng.2019.114119

Cited by 17 publications

(4 citation statements)

References 28 publications

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“…As a result, in the well-known research works, the ranges of heating temperatures and concentrations of components of suspensions, solutions, and emulsions are very wide. For example, some of the studies provided data for evaporation of a drop of sulfur-purified wastewater (electrolyte) with different concentrations of solute, obtained by suspending it on a glass fiber in a heated chamber at varying ambient temperatures (90-170 • C) [26]. The radius of the droplet during evaporation was recorded.…”

Section: Introductionmentioning

confidence: 99%

Rates of High-Temperature Evaporation of Promising Fire-Extinguishing Liquid Droplets

et al. 2019

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Differences in the rates of heating and evaporation of droplets with the component composition are important parameters of heat transfer processes and phase transformations. This paper presents the values of high-temperature (up to 600 °C) evaporation rates of droplets of promising fire-extinguishing compositions (water, bentonite suspension, bischofite solution, EA-5 solution, and foaming agent emulsion) at convective (in the air stream), conductive (on a heated surface), and radiation (in a muffle furnace) heating. A high-speed video recording system and tracking software algorithms are used. At identical initial sizes of droplets of fire-extinguishing suspensions, known as emulsions and solutions, the times of their complete evaporation are shown to differ 3.7 times when heating on the substrate, 1.25 times in the air flow, and 1.9 times in the muffle furnace. A general approximation expression is formulated, and the empirical constants are calculated to predict the evaporation rate of the droplets of extinguishing agents in a wide range of temperatures (up to 600 °C) and heat fluxes (up to 100 kW/m2), which are characteristic of forest fires. With the use of the experimental data obtained, it is possible to predict the completeness of evaporation of promising extinguishing liquids at different schemes of heat supply.

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Section: Introductionmentioning

confidence: 99%

Rates of High-Temperature Evaporation of Promising Fire-Extinguishing Liquid Droplets

et al. 2019

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“…The test system consists of water circulation system, air circulation system and measurement system. Since the salt content of the desulfurization wastewater mainly affects the end of evaporation, and the evaporation trends of droplets with different salt contents are basically the same at the beginning of evaporation [20,21], the ordinary water is used instead of desulfurization wastewater in the water circulation system to carry out the indoor tests. Water from the reservoir through the pump to the heating tank, heated and sent to the water distribution device, the distribution device is made up of three pressure water pipes with a diameter of 25mm, each pipe is equidistantly installed on the three shower nozzles, circulating water sprays from the shower nozzles uniformly, after electromagnetic flowmeter and the flow rate is measured by the electromagnetic flowmeter and returned to the reservoir for recycling.…”

Section: Test Set Up Designmentioning

confidence: 99%

A Study on Mechanism of Evaporation Reduction of Desulfurization Wastewater in Air Cooling Tower

Du,

Li,

Song

et al. 2024

J. Phys.: Conf. Ser.

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It’s a new technology for the concentration and reduction of desulfurization wastewater by the indirect air cooling tower. In this paper, indoor experiments are conducted to explore the evaporation characteristics of the evaporation tower and the evaporation law of desulfurization wastewater in the filler and analyze the factors affecting the evaporation characteristics, and a power plant adopting this technology is tested to verify the conclusion of the indoor experiments. The results show that the evaporation rate of the evaporation tower is positively correlated with the cross-sectional wind speed, water spray density, packing height and other parameters, and the influence of the interrupted wind speed on the evaporation rate is the most significant. The difference of vapor pressure has a positive linear relationship with that of mass fraction of the air in inlet and outlet, and the results of model test conform to those of actual one basically. On the condition of ventilation rate of 817.56m3/s, the evaporation efficiency of a mechanical ventilation cooling tower with a drenching area of about 400m2 can reach 16.2-18.4t/h, which basically meets the engineering needs of desulfurization wastewater concentration and reduction in millions of thermal power plants.

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“…20 Liang et al investigated the component changes in wastewater during the evaporation process by SDD. 21 Thus SDD could be employed to investigate droplet evolution during the evaporation process, and the release characteristics of chloride could also be evaluated by this technique.…”

Section: Introductionmentioning

confidence: 99%

Release characteristics of chloride during single droplet drying process of desulfurization wastewater

Shenb

Zhan

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND:The release characteristics of chloride during the evaporation process of desulfurization wastewater droplets were studied by single droplet drying experiments. The mass, size and temperature variation of droplets during the evaporation process were measured and the release mechanism of chloride was revealed. In addition, the influence of temperature, pH value and metal cation species on the release characteristics of chloride was explored.RESULTS: Combined with the evaporation process, chloride release could be divided into three stages: free water evaporation, shell instability and crystallization chloride salt hydrolysis. In the initial stage, moisture removal was the dominant phenomenon and almost no chloride release was observed. During the stage of shell instability, cycles of droplet inflation and rupture took place, and the release amount of chloride accounted for 51.2% of the total release amount in the typical working conditions. Hydrolysis of crystallization chloride salt played a key role in chloride release and about 46.0% chloride release could be traced during the last stage. High temperature would boost the chloride release; with pH value increasing from 3 to 9, chloride release decreased from 39.7% to 28.8%; a higher magnesium concentration would enhance the chloride release due to the greater hydrolysis strength. CONCLUSION: Chloride in the wastewater droplet would not transfer to the gas phase until the evaporation proceeded to the stage of shell instability. The chloride release characteristics investigated in this work are expected to control the HCl emission in practical engineering of hot flue gas evaporation.

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The study of evaporation characteristics of the desulfurization wastewater (electrolyte solution) droplet

Cited by 17 publications

References 28 publications

Rates of High-Temperature Evaporation of Promising Fire-Extinguishing Liquid Droplets

Rates of High-Temperature Evaporation of Promising Fire-Extinguishing Liquid Droplets

A Study on Mechanism of Evaporation Reduction of Desulfurization Wastewater in Air Cooling Tower

Release characteristics of chloride during single droplet drying process of desulfurization wastewater

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