Reducing the flue gases temperature by individual droplets, aerosol, and large water batches

Voytkov, I.S.; Волков, Р. С.

doi:10.1016/j.expthermflusci.2017.06.009

Cited by 16 publications

(12 citation statements)

References 35 publications

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“…To generate a sprayed water flow, we used a system comprised of a water reservoir, feeding channel, and spraying nozzle 12. The nozzle was the same as in [20,21]. To determine the droplet flow characteristics (droplet velocity U d and droplet radius R d ), we used a panoramic optical system.…”

Section: Dropletsmentioning

confidence: 99%

“…The temperature distribution (LIP measurement) and temperature trend (thermocouple measurement) obtained were processed similarly to [20,21] to determine the following parameters; ∆T a : temperature drop of combustion products or air in the trace of droplet flow relative to its initial value, • C; τ: low (relative to the initial) gas temperature lifetime in the trace of droplet flow, s. Parameter τ describes the time from the point when the temperature of combustion products started dropping, τ 1 (recording initiation at 0 s), until the time of the complete recovery of its initial value, τ 2 . The thermal trace of a droplet is defined as an area in the wake of droplet flow with a temperature at least 10 • C lower than the initial T a .…”

Section: Experimental Data Processingmentioning

confidence: 99%

“…Unlike in [20,21], for each of the measurement techniques in this research, we additionally calculated temperature fluctuation δT as a difference between maximum (T max ) and minimum (T min ) temperature readings in a single experiment (i.e., experimental temperature dispersion at identical initial conditions). We also calculated the difference (∆T) between the thermocouple (T Therm ) and LIP (T LIP ) measurement results.…”

Section: Experimental Data Processingmentioning

confidence: 99%

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Temperature Fields of the Droplets and Gases Mixture

2020

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In this research, we obtain gas–vapor mixture temperature fields generated by blending droplets and high-temperature combustion products. Similar experiments are conducted for droplet injection into heated air flow. This kind of measurement is essential for high-temperature and high-speed processes in contact heat exchangers or in liquid treatment chambers, as well as in firefighting systems. Experiments are conducted using an optical system based on Laser-Induced Phosphorescence as well as two types of thermocouples with a similar measurement range but different response times (0.1–3 s) and accuracy (1–5 °C). In our experiments, we inject droplets into the heated air flow (first scheme) and into the flow of high-temperature combustion products (second scheme). We concentrate on the unsteady inhomogeneous temperature fields of the gas–vapor mixture produced by blending the above-mentioned flows and monitoring the lifetime of the relatively low gas temperature after droplets passes through the observation area. The scientific novelty of this research comes from the first ever comparison of the temperature measurements of a gas–vapor–droplet mixture obtained by contact and non-contact systems. The advantages and limitations of the contact and non-contact techniques are defined for the measurement of gas–vapor mixture temperature.

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Section: Dropletsmentioning

confidence: 99%

Section: Experimental Data Processingmentioning

confidence: 99%

Section: Experimental Data Processingmentioning

confidence: 99%

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Temperature Fields of the Droplets and Gases Mixture

2020

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“…Therefore, in the global energy industry, the development of biofuel technologies defines the growing interest for droplets evaporation process and its influence for fuel burning characteristics [19][20][21][22]. Water droplet and sprays are also suitable for combustion control [18,23] and reduction of toxogens concentrations in combustion products [18,24,25], for cooling of flue gas [26] and recovery of heat [27,28]. The efficiency of liquid spray technology is determined by the intensity of the droplet transfer processes and the very high contact surface between the liquid and gaseous phases.…”

Section: Introductionmentioning

confidence: 99%

“…This is owing to the need of improvement of existing and development of new spraying technologies. This requires a good understanding of the heat and mass transfer processes of the sprayed liquid droplets, and droplet studies are conducted in various aspects [26,[29][30][31][32][33][34][35][36]. The boundary conditions of the water droplets phase change and heat transfer in biofuel combustion technologies can be very different.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Water Droplet Heating in Humidified Air Flow

Ramanauskas¹,

Puida

Miliauskas

et al. 2019

mech

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The droplet heat and mass transfer processes are important for liquid spraying technologies, which were investigated when applying the theoretical and numerical modelling and experimental methods. In this work, results of experimental research on the heating of water droplets in purified biofuel flue gas were presented and analyzed. In experimental investigation, the purified biofuel flue gas is replaced by additionally humidified airflow. The experiment methods and results processing are discussed and provided. Impact of air heating and additional humidification was estimated. While heating and additionally humidifying the air flow was focused on boundary conditions in condense economizers, when the flue gas temperature is 20-100°C and water vapor volume fraction is 0-0.2.

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