Experimental Model Study of Liquid–Liquid and Liquid–Gas Interfaces during Blast Furnace Hearth Drainage
2. Experimental Setup
2.1. Apparatus Arrangement and Procedure
- The lifting table was elevated to a certain level, followed by opening the ball valve to charge water into the model until the predetermined level was reached.
- The moveable oil distributor was fixed on top of the model and the peristaltic pump was started at low pumping speed to feed oil into the model slowly to create an oil layer with uniform and desired thickness.
- A settling time of a few minutes was allowed for both l–g and l–l interfaces to become absolutely stable. After this, the oil distributor was removed from the top of the model.
- The vacuum pump was switched on until the desired under-pressure was obtained in the receiver.
- The high-speed camera was turned on to record the drainage process.
- The outlet was opened fully. When air started blowing out through the outlet, the outlet was closed and the camera was switched off.
- The vent was opened to recover the receiver pressure, and the drain of the receiver was opened to empty the receiver.
2.2. Experimental Conditions and Analytical Methods
3. Results and Discussion
3.1. Influence on Residual Ratio, Tapping Time
3.1.1. Influence of Initial Oil Layer Thickness
3.1.2. Influence of the Initial l–l Interface Level
3.1.3. Influence of Pressure Difference
3.1.4. Influence of Oil Viscosity
3.2. Effect of the Factors on the End State
3.2.1. Effect of the Initial l–l Interface Level
3.2.2. Effect of the Pressure Difference
3.2.3. Effect of Oil Viscosity
3.3. Comparison with Earlier Findings
- An increase in the initial oil layer thickness (i.e., more accumulated slag in the hearth) extends the draining time and decreases the residual ratios of both liquids. In addition, the likelihood of abnormal drainage also decreases.
- With a higher initial l–l interface level, the draining time increases and the residual liquid ratios decrease. The likelihood of abnormal drainage increases.
- With an increased pressure difference (“driving force”) in the system, the residual liquids ratios and the likelihood of abnormal drainage increase, while the gas breakthrough time decreases.
- An increase of oil viscosity increases the tapping time and reduces the likelihood of abnormal drainage and residual ratios of both liquids.
Conflicts of Interest
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|BF: Slag–Iron||Model: Oil–Water|
|Density of phase 1, (kg/m3)||6800||998|
|Dynamic viscosity of phase 1, (Pa·s)||0.0068||0.001|
|Density of phase 2, (kg/m3)||2800||855|
|Dynamic viscosity of phase 2, (Pa·s)||0.43||0.131, 0.254|
|Experimental Group Number||Δp|
|Initial l–l Interface Level|
|Initial Oil Layer Thickness|
|Initial Oil Layer Thickness|
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Liu, W.; Shao, L.; Saxén, H. Experimental Model Study of Liquid–Liquid and Liquid–Gas Interfaces during Blast Furnace Hearth Drainage. Metals 2020, 10, 496. https://doi.org/10.3390/met10040496
Liu W, Shao L, Saxén H. Experimental Model Study of Liquid–Liquid and Liquid–Gas Interfaces during Blast Furnace Hearth Drainage. Metals. 2020; 10(4):496. https://doi.org/10.3390/met10040496Chicago/Turabian Style
Liu, Weiqiang, Lei Shao, and Henrik Saxén. 2020. "Experimental Model Study of Liquid–Liquid and Liquid–Gas Interfaces during Blast Furnace Hearth Drainage" Metals 10, no. 4: 496. https://doi.org/10.3390/met10040496