The Experts below are selected from a list of 225 Experts worldwide ranked by ideXlab platform
Xiaobing Li - One of the best experts on this subject based on the ideXlab platform.
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Research of novel process route and scale-up based on oil-water separation flotation column
Journal of Water Reuse and Desalination, 2017Co-Authors: Huang, Hongxiang Xu, Xiaobing Li, Lun Wu, Yongtian WangAbstract:A novel process ‘coalescence-airflotation-carrier preferential adsorption’ utilising an oil-water separation flotation column with a unique structure was used in the oil-water separation field. The oil-water separation flotation column contains the cyclonic separation and airflotation separation which has advantages in oily sewage treatment, especially in polymer-flooding-drive oily sewage treatment. In this paper, different dimensions of flotation column with 1 m 3 d −1 , 30 m 3 d −1 and 2,000 m 3 d −1 oil-water separation systems were investigated. In addition, several operating parameters which impact separation, such as feeding speed, aeration rate, Circulating Pressure, adsorbents consumption and frother consumption were also investigated. The optimum operating parameters determined for 1 m 3 d −1 the oil-water separation flotation column were a feeding speed of 0.042 m 3 h −1 , an aeration rate of 0.10 m 3 h −1 , a coal consumption of 4 (g coal)·(g oil) −1 , a frother consumption of 10 mg L −1 , and a Circulating Pressure of 0.12 MPa. The novel process cost reduced 55.8% than conventional two-stage air flotation process. In the 2,000 m 3 d −1 oil-water separation experiment, the oil concentration and the oil removal efficiency of outlet are 23.39 mgL −1 , 97.70%, respectively. Sediment is not produced during the oily sewage treatment using the novel process and flotation column.
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The effect of bubble size on oil-water separation efficiency for a novel oil-water separation column
Separation Science and Technology, 2015Co-Authors: Hongxiang Xu, Xiaobing Li, Chunjuan Zhang, Yongtian WangAbstract:AbstractBubble size is a key factor in froth flotation for oil-water separation. In this paper, the bubble size which impacts on oil removal efficiency for a novel oil-water separation column was researched systematically. The bubble size distribution was researched by using the photographic method and Matlab software. In addition, several operating parameters which impact on the bubble size were investigated, including Circulating Pressure, aeration rate, and the foaming agent. Based on the results of experimental data and image analysis, the frother consumption and aeration rate has important influence on the bubble size. The bubble size can be controlled by adjusting the operation conditions including the Circulating Pressure, aeration rate, and the frother consumption. The optimum operating conditions for the oil-water separation column were determined. Furthermore, the mathematical model of oil removal efficiency for the oil-water separation column was established.
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Study of Oil Removal Kinetics using Cyclone-Static Microbubble Flotation Column
Separation Science and Technology, 2014Co-Authors: Hongxiang Xu, Yongtian Wang, Xiaowei Deng, Xiaobing LiAbstract:The cyclonic-static microbubble flotation column (FCSMC) has dual effects including the cyclonic separation and airflotation separation with advantages in the oily wastewater treatment field such as the small lower limit of the effective separation size, short separation time, large handling capacity, and low operating cost, especially the polymer-flooding oily wastewater treatment aspect. In this paper, the cyclonic separation function mechanism of the FCSMC was investigated. In addition, several operating parameters which impact oil removal efficiency and kinetics constants such as Circulating Pressure, the superficial gas velocity and the frother consumption were also investigated. The mathematical model relationship between the separation kinetics constants and the factors including Circulating Pressure, gas superficial velocity, and the average bubble diameter was established. Based on the strength by steps, the physical separation model of the cyclonic-static microbubble was also established.
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Oil removing efficiency in oil–water separation flotation column
Desalination and Water Treatment, 2014Co-Authors: Hongxiang Xu, Yongtian Wang, Xiaowei Deng, Gan Cheng, Xiaobing LiAbstract:AbstractAn oil–water separation flotation column with a unique structure was used in oil–water separation fields. The oil–water separation flotation column contains the cyclonic separation and airflotation separation with advantages in the oily sewage treatment field such as low effective separation size, short separation time, large handling capacity, and low operating cost, especially in polymer-flooding-drive oily sewage treatment aspect. In this paper, the oil removal efficiencies of the cyclonic and airflotation sections of the oil–water separation flotation column were investigated. In addition, several operating parameters which impact separation such as feeding speed, aeration rate, Circulating Pressure, underflow split ratio, frother consumption were also investigated. The optimum operating parameters determined for the oil–water separation flotation column were a feeding speed of 1.50 m3 h−1, an aeration rate of 2.50 m3 h−1, and a Circulating Pressure of 0.28 MPa. A bottom flow diversion ratio o...
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Cyclonic separation process intensification oil removal based on microbubble flotation
International journal of mining science and technology, 2013Co-Authors: Hongxiang Xu, Xiaobing LiAbstract:Abstract The cyclonic-static microbubble flotation column has dual effects including the cyclonic separation and floatation separation with the characteristics of the small lower limit of the effective separation size, short separation time, large handling capacity, and low operation cost. It shows significant advantages in the oily wastewater treatment field, especially the polymer flooding oily wastewater treatment aspect. In this paper, the cyclonic separation function mechanism of the cyclonic-static microbubble flotation column was studied, the impact of the parameters including the feeding rate, aeration rate, Circulating Pressure, and underflow split ratio on the cyclonic separation efficiency was investigated, and the cyclonic separation efficiency model was established as well. In addition, by applying the Doppler Laser Velocimeter (LDV) and Fluent simulation software, the test and simulation to the single-phase flow velocity field of the cyclonic separation section of the cyclonic-static microbubble flotation column were carried out, and the velocity distribution rule of the cyclonic separation section was analyzed under the single-phase flow conditions.
Hongxiang Xu - One of the best experts on this subject based on the ideXlab platform.
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Research of novel process route and scale-up based on oil-water separation flotation column
Journal of Water Reuse and Desalination, 2017Co-Authors: Huang, Hongxiang Xu, Xiaobing Li, Lun Wu, Yongtian WangAbstract:A novel process ‘coalescence-airflotation-carrier preferential adsorption’ utilising an oil-water separation flotation column with a unique structure was used in the oil-water separation field. The oil-water separation flotation column contains the cyclonic separation and airflotation separation which has advantages in oily sewage treatment, especially in polymer-flooding-drive oily sewage treatment. In this paper, different dimensions of flotation column with 1 m 3 d −1 , 30 m 3 d −1 and 2,000 m 3 d −1 oil-water separation systems were investigated. In addition, several operating parameters which impact separation, such as feeding speed, aeration rate, Circulating Pressure, adsorbents consumption and frother consumption were also investigated. The optimum operating parameters determined for 1 m 3 d −1 the oil-water separation flotation column were a feeding speed of 0.042 m 3 h −1 , an aeration rate of 0.10 m 3 h −1 , a coal consumption of 4 (g coal)·(g oil) −1 , a frother consumption of 10 mg L −1 , and a Circulating Pressure of 0.12 MPa. The novel process cost reduced 55.8% than conventional two-stage air flotation process. In the 2,000 m 3 d −1 oil-water separation experiment, the oil concentration and the oil removal efficiency of outlet are 23.39 mgL −1 , 97.70%, respectively. Sediment is not produced during the oily sewage treatment using the novel process and flotation column.
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The effect of bubble size on oil-water separation efficiency for a novel oil-water separation column
Separation Science and Technology, 2015Co-Authors: Hongxiang Xu, Xiaobing Li, Chunjuan Zhang, Yongtian WangAbstract:AbstractBubble size is a key factor in froth flotation for oil-water separation. In this paper, the bubble size which impacts on oil removal efficiency for a novel oil-water separation column was researched systematically. The bubble size distribution was researched by using the photographic method and Matlab software. In addition, several operating parameters which impact on the bubble size were investigated, including Circulating Pressure, aeration rate, and the foaming agent. Based on the results of experimental data and image analysis, the frother consumption and aeration rate has important influence on the bubble size. The bubble size can be controlled by adjusting the operation conditions including the Circulating Pressure, aeration rate, and the frother consumption. The optimum operating conditions for the oil-water separation column were determined. Furthermore, the mathematical model of oil removal efficiency for the oil-water separation column was established.
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Study of Oil Removal Kinetics using Cyclone-Static Microbubble Flotation Column
Separation Science and Technology, 2014Co-Authors: Hongxiang Xu, Yongtian Wang, Xiaowei Deng, Xiaobing LiAbstract:The cyclonic-static microbubble flotation column (FCSMC) has dual effects including the cyclonic separation and airflotation separation with advantages in the oily wastewater treatment field such as the small lower limit of the effective separation size, short separation time, large handling capacity, and low operating cost, especially the polymer-flooding oily wastewater treatment aspect. In this paper, the cyclonic separation function mechanism of the FCSMC was investigated. In addition, several operating parameters which impact oil removal efficiency and kinetics constants such as Circulating Pressure, the superficial gas velocity and the frother consumption were also investigated. The mathematical model relationship between the separation kinetics constants and the factors including Circulating Pressure, gas superficial velocity, and the average bubble diameter was established. Based on the strength by steps, the physical separation model of the cyclonic-static microbubble was also established.
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Oil removing efficiency in oil–water separation flotation column
Desalination and Water Treatment, 2014Co-Authors: Hongxiang Xu, Yongtian Wang, Xiaowei Deng, Gan Cheng, Xiaobing LiAbstract:AbstractAn oil–water separation flotation column with a unique structure was used in oil–water separation fields. The oil–water separation flotation column contains the cyclonic separation and airflotation separation with advantages in the oily sewage treatment field such as low effective separation size, short separation time, large handling capacity, and low operating cost, especially in polymer-flooding-drive oily sewage treatment aspect. In this paper, the oil removal efficiencies of the cyclonic and airflotation sections of the oil–water separation flotation column were investigated. In addition, several operating parameters which impact separation such as feeding speed, aeration rate, Circulating Pressure, underflow split ratio, frother consumption were also investigated. The optimum operating parameters determined for the oil–water separation flotation column were a feeding speed of 1.50 m3 h−1, an aeration rate of 2.50 m3 h−1, and a Circulating Pressure of 0.28 MPa. A bottom flow diversion ratio o...
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Cyclonic separation process intensification oil removal based on microbubble flotation
International journal of mining science and technology, 2013Co-Authors: Hongxiang Xu, Xiaobing LiAbstract:Abstract The cyclonic-static microbubble flotation column has dual effects including the cyclonic separation and floatation separation with the characteristics of the small lower limit of the effective separation size, short separation time, large handling capacity, and low operation cost. It shows significant advantages in the oily wastewater treatment field, especially the polymer flooding oily wastewater treatment aspect. In this paper, the cyclonic separation function mechanism of the cyclonic-static microbubble flotation column was studied, the impact of the parameters including the feeding rate, aeration rate, Circulating Pressure, and underflow split ratio on the cyclonic separation efficiency was investigated, and the cyclonic separation efficiency model was established as well. In addition, by applying the Doppler Laser Velocimeter (LDV) and Fluent simulation software, the test and simulation to the single-phase flow velocity field of the cyclonic separation section of the cyclonic-static microbubble flotation column were carried out, and the velocity distribution rule of the cyclonic separation section was analyzed under the single-phase flow conditions.
Yongtian Wang - One of the best experts on this subject based on the ideXlab platform.
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Research of novel process route and scale-up based on oil-water separation flotation column
Journal of Water Reuse and Desalination, 2017Co-Authors: Huang, Hongxiang Xu, Xiaobing Li, Lun Wu, Yongtian WangAbstract:A novel process ‘coalescence-airflotation-carrier preferential adsorption’ utilising an oil-water separation flotation column with a unique structure was used in the oil-water separation field. The oil-water separation flotation column contains the cyclonic separation and airflotation separation which has advantages in oily sewage treatment, especially in polymer-flooding-drive oily sewage treatment. In this paper, different dimensions of flotation column with 1 m 3 d −1 , 30 m 3 d −1 and 2,000 m 3 d −1 oil-water separation systems were investigated. In addition, several operating parameters which impact separation, such as feeding speed, aeration rate, Circulating Pressure, adsorbents consumption and frother consumption were also investigated. The optimum operating parameters determined for 1 m 3 d −1 the oil-water separation flotation column were a feeding speed of 0.042 m 3 h −1 , an aeration rate of 0.10 m 3 h −1 , a coal consumption of 4 (g coal)·(g oil) −1 , a frother consumption of 10 mg L −1 , and a Circulating Pressure of 0.12 MPa. The novel process cost reduced 55.8% than conventional two-stage air flotation process. In the 2,000 m 3 d −1 oil-water separation experiment, the oil concentration and the oil removal efficiency of outlet are 23.39 mgL −1 , 97.70%, respectively. Sediment is not produced during the oily sewage treatment using the novel process and flotation column.
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The effect of bubble size on oil-water separation efficiency for a novel oil-water separation column
Separation Science and Technology, 2015Co-Authors: Hongxiang Xu, Xiaobing Li, Chunjuan Zhang, Yongtian WangAbstract:AbstractBubble size is a key factor in froth flotation for oil-water separation. In this paper, the bubble size which impacts on oil removal efficiency for a novel oil-water separation column was researched systematically. The bubble size distribution was researched by using the photographic method and Matlab software. In addition, several operating parameters which impact on the bubble size were investigated, including Circulating Pressure, aeration rate, and the foaming agent. Based on the results of experimental data and image analysis, the frother consumption and aeration rate has important influence on the bubble size. The bubble size can be controlled by adjusting the operation conditions including the Circulating Pressure, aeration rate, and the frother consumption. The optimum operating conditions for the oil-water separation column were determined. Furthermore, the mathematical model of oil removal efficiency for the oil-water separation column was established.
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Study of Oil Removal Kinetics using Cyclone-Static Microbubble Flotation Column
Separation Science and Technology, 2014Co-Authors: Hongxiang Xu, Yongtian Wang, Xiaowei Deng, Xiaobing LiAbstract:The cyclonic-static microbubble flotation column (FCSMC) has dual effects including the cyclonic separation and airflotation separation with advantages in the oily wastewater treatment field such as the small lower limit of the effective separation size, short separation time, large handling capacity, and low operating cost, especially the polymer-flooding oily wastewater treatment aspect. In this paper, the cyclonic separation function mechanism of the FCSMC was investigated. In addition, several operating parameters which impact oil removal efficiency and kinetics constants such as Circulating Pressure, the superficial gas velocity and the frother consumption were also investigated. The mathematical model relationship between the separation kinetics constants and the factors including Circulating Pressure, gas superficial velocity, and the average bubble diameter was established. Based on the strength by steps, the physical separation model of the cyclonic-static microbubble was also established.
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Oil removing efficiency in oil–water separation flotation column
Desalination and Water Treatment, 2014Co-Authors: Hongxiang Xu, Yongtian Wang, Xiaowei Deng, Gan Cheng, Xiaobing LiAbstract:AbstractAn oil–water separation flotation column with a unique structure was used in oil–water separation fields. The oil–water separation flotation column contains the cyclonic separation and airflotation separation with advantages in the oily sewage treatment field such as low effective separation size, short separation time, large handling capacity, and low operating cost, especially in polymer-flooding-drive oily sewage treatment aspect. In this paper, the oil removal efficiencies of the cyclonic and airflotation sections of the oil–water separation flotation column were investigated. In addition, several operating parameters which impact separation such as feeding speed, aeration rate, Circulating Pressure, underflow split ratio, frother consumption were also investigated. The optimum operating parameters determined for the oil–water separation flotation column were a feeding speed of 1.50 m3 h−1, an aeration rate of 2.50 m3 h−1, and a Circulating Pressure of 0.28 MPa. A bottom flow diversion ratio o...
Guo Sheng Li - One of the best experts on this subject based on the ideXlab platform.
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Experimental study on removal of unburned carbon from coal fly ash using flotation column
Journal of China Coal Society, 2020Co-Authors: Guo Sheng LiAbstract:The fly ash sample was characterized by size fraction,X-ray diffraction,contact angle measurements and Xray fluorescence.The function of a new type of frother(KD) which can produce more stable foam than conventional frothers was studied.The effect of the column flotation operating variables on the removal of unburned carbon from the fly ash was also systematically examined.Within the range studied,the optimum frother dosage is 400 g/ t,superficial gas velocity is 1.8 cm/ s,froth thickness is about 150-200 mm and Circulating Pressure is 0.22 MPa.The results indicate that Cyclonic-Static Micro-bubble Flotation Column(FCSMC) technique is effective in removing the unburned carbon from coal fly ash.Under the optimized conditions,a cleaning ash with 3.15% LOI(Loss on Ignition) and 91.88% RUC(Removal Rate of Unburned Carbon) is obtained.
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Removal of unburned carbon from fly ash using a cyclonic-static microbubble flotation column
Journal of The South African Institute of Mining and Metallurgy, 2012Co-Authors: Guo Sheng Li, H.j. Zhang, X. ZhaiAbstract:Synopsis The purpose of this study was to investigate the flotation behaviour of unburned carbon in a cyclonic-static microbubble flotation column (FCSMC). The ash sample, collected from a power station in Guangdong province of China, was characterized by size analysis, X-ray diffraction, contact angle measurements, and X-ray fluorescence. The effect of the column flotation operating variables on the removal of unburned carbon from the fly ash was systematically studied. The feasibility of separating unburned carbon and ash was determined from the removal rate of unburned carbon (RUC) and loss on ignition (LOI). Within the range studied, the optimum diesel oil dosage was 1200 g/t, abies oil dosage was 600 g/t, pulp density was 20 per cent, superficial gas velocity was 1.4 cm/s, and Circulating Pressure was 0.20 MPa. The results indicate that the FCSMC technique is effective in removing the unburned carbon from the fly ash, which can be attributed to the generation of microbubbles and the continuous cyclonic circulation method. Under the optimized conditions, a cleaning ash with 2.13 per cent LOI and 94.21 per cent RUC was obtained.
Tianfu Xu - One of the best experts on this subject based on the ideXlab platform.
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Use of CO2 as Heat Transmission Fluid to Extract Geothermal Energy: Advantages and Disadvantages in Comparison with Water
2020Co-Authors: Tianfu Xu, Guanhong FengAbstract:Use of CO2 as heat transmission fluid to extract geothermal energy is currently considered as a way to achieve CO2 resource utilization and geological sequestration. As a novel heat transmission fluid, the thermophysical property of CO2 is quite different from water. It has many advantages, such as larger mobility and buoyancy resulted from the lower density and viscosity. This will reduce the consumption of driving Pressure of the circulation, and save the energy consumption of external equipment. The cycle even can be achieved by siphon phenomenon under a negative Circulating Pressure difference. However, there are still some disadvantages for CO2 as a kind of heat transmission fluid, such as small heat capacity, leading to carry less heat at the same mass flow rate. At the same time, if temperature and Pressure change, it will cause a more complex flow and thermodynamic processes because of the lager expansion and compression coefficient for CO2. Lager compressibility makes it possible to get high temperature at the bottom of the injection well, but lager expansion coefficient makes the temperature drops rapidly during the extraction process. Therefore, how to scientifically control the production Pressure to guarantee the temperature at the head of production well to be high enough and then improve the efficiency of heat extraction is the key problem to be further studied and solved. Here, a classic idealized “five-spot” model coupled with wellbores is set up according to the geological and geothermal conditions and parameters of the central depression of Songliao basin. Our purpose is to (1) explore the flow and thermodynamics process of supercritical CO2 as heat transmission fluid, analyze the heat recovery mechanism, (2) compare the heat extraction efficiency of CO2 with water, and evaluate the advantages and disadvantages using CO2, (3) optimize the temperature and Pressure of injection and production and other parameters for CO2, and (4) determine the favorable range of temperature and Pressure of geothermal reservoirs, and provide a theoretical basis for the selection of heat transmission fluid. Results from this work may be useful for future field design of a CO2-geothermal system.
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Wellbore–reservoir coupled simulation to study thermal and fluid processes in a CO2-based geothermal system: identifying favorable and unfavorable conditions in comparison with water
Environmental Earth Sciences, 2015Co-Authors: Tianfu Xu, Guanhong Feng, Zhaoyun Hou, Yan Shi, Hailong Tian, Hongwu LeiAbstract:Using CO2 as a heat transmission fluid to extract geothermal energy is currently considered as a way to achieve CO2 resource utilization and geological sequestration. As a novel heat transmission fluid, the thermophysical properties of CO2 are quite different from those of water. CO2 has many advantages, such as larger mobility and buoyancy resulted from the lower density and viscosity. This will reduce the consumption of Pressure driving the circulation, and save the energy of external equipment. The cycle even can be achieved by siphon phenomenon under a negative Circulating Pressure difference. However, there are still some disadvantages for CO2 as the heat transmission fluid, such as small heat capacity, leading to a less heat at the same mass flow rate. At the same time, because of the lager expansion and compression coefficient for CO2, changes in temperature and Pressure may cause a more complex flow and thermodynamic processes. The lager compressibility makes it possible to get high temperature at the bottom of the injection well, whereas the lager expansion coefficient makes the temperature drop rapidly along the production well. Therefore, how to scientifically control the production Pressure to guarantee sufficient high temperatures at the head of production well and, thereby, improve the efficiency of heat extraction are the key issues needed to be further addressed. The geological and geothermal conditions correspond to the central depression of the Songliao Basin located in the Northest of China. This depression has a high geothermal gradient and heat flow. In this article, a classic idealized “five-spot” reservoir model coupled with wellbores is used for simulations and analyses. The objectives of the present work are: (1) to investigate the fluid flow and thermal processes of supercritical CO2 along the wellbore and in the reservoir, (2) to understand the heat-extracting mechanism, (3) to identify advantages and disadvantages of using CO2 as the heat transmission fluid, and (4) to provide a theoretical basis for the selection of heat transmission fluid.
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wellbore reservoir coupled simulation to study thermal and fluid processes in a co2 based geothermal system identifying favorable and unfavorable conditions in comparison with water
Environmental Earth Sciences, 2015Co-Authors: Tianfu Xu, Guanhong Feng, Hailong TianAbstract:Using CO2 as a heat transmission fluid to extract geothermal energy is currently considered as a way to achieve CO2 resource utilization and geological sequestration. As a novel heat transmission fluid, the thermophysical properties of CO2 are quite different from those of water. CO2 has many advantages, such as larger mobility and buoyancy resulted from the lower density and viscosity. This will reduce the consumption of Pressure driving the circulation, and save the energy of external equipment. The cycle even can be achieved by siphon phenomenon under a negative Circulating Pressure difference. However, there are still some disadvantages for CO2 as the heat transmission fluid, such as small heat capacity, leading to a less heat at the same mass flow rate. At the same time, because of the lager expansion and compression coefficient for CO2, changes in temperature and Pressure may cause a more complex flow and thermodynamic processes. The lager compressibility makes it possible to get high temperature at the bottom of the injection well, whereas the lager expansion coefficient makes the temperature drop rapidly along the production well. Therefore, how to scientifically control the production Pressure to guarantee sufficient high temperatures at the head of production well and, thereby, improve the efficiency of heat extraction are the key issues needed to be further addressed. The geological and geothermal conditions correspond to the central depression of the Songliao Basin located in the Northest of China. This depression has a high geothermal gradient and heat flow. In this article, a classic idealized “five-spot” reservoir model coupled with wellbores is used for simulations and analyses. The objectives of the present work are: (1) to investigate the fluid flow and thermal processes of supercritical CO2 along the wellbore and in the reservoir, (2) to understand the heat-extracting mechanism, (3) to identify advantages and disadvantages of using CO2 as the heat transmission fluid, and (4) to provide a theoretical basis for the selection of heat transmission fluid.