The Experts below are selected from a list of 1341 Experts worldwide ranked by ideXlab platform
Yuzhong Zhang - One of the best experts on this subject based on the ideXlab platform.
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nh2 mil 125 filled mixed matrix membrane contactor with so2 enrichment for flue gas Desulphurization
Chemical Engineering Journal, 2021Co-Authors: Yanli Zhang, Qingping Xin, Ligang Lin, Xiaoli Ding, Lizhi Zhao, Yuzhong ZhangAbstract:Abstract Membrane absorption is a convenient and efficient flue SO2 capture technology. In this study, NH2-MIL-125 filled mixed matrix membrane contactor (MMMC) is constructed by Non-solvent Induced Phase Separation (NIPS) method. The functional groups and metal active sites on the surface of NH2-MIL-125(Ti) exhibit high affinity for SO2. The microporous structure of NH2-MIL-125(Ti) provides storage for adsorbed SO2, which is conducive to the formation of SO2 enrichment zone in the membrane. The membrane morphology, wetting resistance, and light responsiveness et al of MMMC have been tested. The combination of NH2-MIL-125(Ti) adsorption and membrane absorption process effectively promotes the transfer of gas molecules in the membrane pores. The SO2 absorption flux of MMMC filled by NH2-MIL-125(Ti) has a significant increment, reaching 8.81×10-4 mol·m-2·s-1 and 9.77×10-4 mol·m-2·s-1 under non-light and visible light conditions respectively, which is comparability with results in literature. The membrane phase mass transfer coefficient calculated by Wilson model is 149.6 s·m-1, which shows the low resistance in membrane. The SO2 absorption flux keep stable after 4 cycles of tests. The membrane contactor coupled with function fillers enhances the SO2 capture ability and further promotes the enrichment of SO2, which has favorable development foreground.
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electrospinning in membrane contactor manufacturing elec pvdf sio2 superhydrophobic surface for efficient flue gas Desulphurization applications
Green Chemical Engineering, 2021Co-Authors: Qingping Xin, Kaiqiang Xie, Qingqing Liang, Yinan Zeng, Yuhang Zhao, Lei Zhang, Shaofei Wang, Yuzhong ZhangAbstract:Abstract In membrane contactors, maintaining a high SO2 absorption flux and an excellent wetting resistance are crucial for hazardous gas removal. In this study, we adopted an electrospinning strategy to fabricate highly robust superhydrophobic dual-layer Elec-PVDF/SiO2 composite membrane contactors used for flue gas desulfurization. The composite membrane contactor consisted of a durable and ultrathin three-dimensional (3D) superhydrophobic surface and a porous supporting layer, where the formulation was optimized by regulating the PVDF concentration, solvent ratio and SiO2 particles content in electrospinning solution. The scanning electronic microscopy (SEM), EDS-mapping, water contact angle (WCA) and surface roughness of as-prepared Elec-PVDF/SiO2 composite membrane contactors wereconducted to explore the physical and chemical structure. The SiO2 nanoparticles wereuniformly loaded in Elec-PVDF/SiO2 composite membrane contactor, and constructed micro-nano dual-coarse lotus-leaf-like morphology, which noticeably elevated surface roughness (Ra). The SiO2 nanoparticles also functioned as hydrophobic modifiers, which boosted the WAC up to 155°. The SO2 absorption fluxes and SO2 removal efficiencies were investigated. In particular, the membrane contactor doped with 20 wt% SiO2 nanoparticles significantly elevated the stability of desulfurization performance. Besides, the membrane mass transfer coefficient (Km) and corresponding membrane mass transfer resistance (H/Km) were explored.
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metal organic frameworks decorated membrane contactor constructing so2 philic channels for efficient flue gas Desulphurization
Journal of Membrane Science, 2021Co-Authors: Qingping Xin, Shaofei Wang, Yu Zhang, Mingya Yun, Ligang Lin, Xiaoli Ding, Yuzhong ZhangAbstract:Abstract Membrane contactor has been considered to be a prospective alternative to traditional technology for toxic acid gases capture. In this study, the mixed matix membrane contactors (MMMCs) with the metal organic frameworks (MOFs, MIL-101(Cr)) as fillers are fabricated for high-efficiency SO2 removal. The MIL-101(Cr) with microporous structure provides more SO2 channels for the enhancement of SO2 absorption flux. Moreover, the open metal sites from MIL-101(Cr) display the high affinity to SO2, which construct “SO2-philic” channels in the finger-like pore structure, resulting in the increment of SO2 removal efficiency. The introduction of MIL-101(Cr) into PVDF modifies the physical structure verified by scanning electron microscope (SEM), liquid entry pressure (LEPw) and gas permeation test et al. The newly developed MIL-101(Cr) doped MMMCs exhibit competitive hydrophobicity with the water contact angle of 119°. In particular, the M915 MMMC with MIL-101(Cr) loading 15 wt% displays the optimum SO2 absorption performance with the SO2 absorption flux and SO2 removal efficiency of 1.09 × 10−3 mol m−2 s−1 and 89.51%, respectively. The SO2 mass transfer coefficient in membrane (Km) is significantly enhanced to 4.44 × 10−3 m s−1 and membrane phase resistance (H/Km) is noticeably decreased to 92.96 s m−1. Besides, the MIL-101(Cr) doped MMMCs show both the alkali resistance and long-term stability.
Qingping Xin - One of the best experts on this subject based on the ideXlab platform.
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nh2 mil 125 filled mixed matrix membrane contactor with so2 enrichment for flue gas Desulphurization
Chemical Engineering Journal, 2021Co-Authors: Yanli Zhang, Qingping Xin, Ligang Lin, Xiaoli Ding, Lizhi Zhao, Yuzhong ZhangAbstract:Abstract Membrane absorption is a convenient and efficient flue SO2 capture technology. In this study, NH2-MIL-125 filled mixed matrix membrane contactor (MMMC) is constructed by Non-solvent Induced Phase Separation (NIPS) method. The functional groups and metal active sites on the surface of NH2-MIL-125(Ti) exhibit high affinity for SO2. The microporous structure of NH2-MIL-125(Ti) provides storage for adsorbed SO2, which is conducive to the formation of SO2 enrichment zone in the membrane. The membrane morphology, wetting resistance, and light responsiveness et al of MMMC have been tested. The combination of NH2-MIL-125(Ti) adsorption and membrane absorption process effectively promotes the transfer of gas molecules in the membrane pores. The SO2 absorption flux of MMMC filled by NH2-MIL-125(Ti) has a significant increment, reaching 8.81×10-4 mol·m-2·s-1 and 9.77×10-4 mol·m-2·s-1 under non-light and visible light conditions respectively, which is comparability with results in literature. The membrane phase mass transfer coefficient calculated by Wilson model is 149.6 s·m-1, which shows the low resistance in membrane. The SO2 absorption flux keep stable after 4 cycles of tests. The membrane contactor coupled with function fillers enhances the SO2 capture ability and further promotes the enrichment of SO2, which has favorable development foreground.
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electrospinning in membrane contactor manufacturing elec pvdf sio2 superhydrophobic surface for efficient flue gas Desulphurization applications
Green Chemical Engineering, 2021Co-Authors: Qingping Xin, Kaiqiang Xie, Qingqing Liang, Yinan Zeng, Yuhang Zhao, Lei Zhang, Shaofei Wang, Yuzhong ZhangAbstract:Abstract In membrane contactors, maintaining a high SO2 absorption flux and an excellent wetting resistance are crucial for hazardous gas removal. In this study, we adopted an electrospinning strategy to fabricate highly robust superhydrophobic dual-layer Elec-PVDF/SiO2 composite membrane contactors used for flue gas desulfurization. The composite membrane contactor consisted of a durable and ultrathin three-dimensional (3D) superhydrophobic surface and a porous supporting layer, where the formulation was optimized by regulating the PVDF concentration, solvent ratio and SiO2 particles content in electrospinning solution. The scanning electronic microscopy (SEM), EDS-mapping, water contact angle (WCA) and surface roughness of as-prepared Elec-PVDF/SiO2 composite membrane contactors wereconducted to explore the physical and chemical structure. The SiO2 nanoparticles wereuniformly loaded in Elec-PVDF/SiO2 composite membrane contactor, and constructed micro-nano dual-coarse lotus-leaf-like morphology, which noticeably elevated surface roughness (Ra). The SiO2 nanoparticles also functioned as hydrophobic modifiers, which boosted the WAC up to 155°. The SO2 absorption fluxes and SO2 removal efficiencies were investigated. In particular, the membrane contactor doped with 20 wt% SiO2 nanoparticles significantly elevated the stability of desulfurization performance. Besides, the membrane mass transfer coefficient (Km) and corresponding membrane mass transfer resistance (H/Km) were explored.
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metal organic frameworks decorated membrane contactor constructing so2 philic channels for efficient flue gas Desulphurization
Journal of Membrane Science, 2021Co-Authors: Qingping Xin, Shaofei Wang, Yu Zhang, Mingya Yun, Ligang Lin, Xiaoli Ding, Yuzhong ZhangAbstract:Abstract Membrane contactor has been considered to be a prospective alternative to traditional technology for toxic acid gases capture. In this study, the mixed matix membrane contactors (MMMCs) with the metal organic frameworks (MOFs, MIL-101(Cr)) as fillers are fabricated for high-efficiency SO2 removal. The MIL-101(Cr) with microporous structure provides more SO2 channels for the enhancement of SO2 absorption flux. Moreover, the open metal sites from MIL-101(Cr) display the high affinity to SO2, which construct “SO2-philic” channels in the finger-like pore structure, resulting in the increment of SO2 removal efficiency. The introduction of MIL-101(Cr) into PVDF modifies the physical structure verified by scanning electron microscope (SEM), liquid entry pressure (LEPw) and gas permeation test et al. The newly developed MIL-101(Cr) doped MMMCs exhibit competitive hydrophobicity with the water contact angle of 119°. In particular, the M915 MMMC with MIL-101(Cr) loading 15 wt% displays the optimum SO2 absorption performance with the SO2 absorption flux and SO2 removal efficiency of 1.09 × 10−3 mol m−2 s−1 and 89.51%, respectively. The SO2 mass transfer coefficient in membrane (Km) is significantly enhanced to 4.44 × 10−3 m s−1 and membrane phase resistance (H/Km) is noticeably decreased to 92.96 s m−1. Besides, the MIL-101(Cr) doped MMMCs show both the alkali resistance and long-term stability.
Shigang Zhang - One of the best experts on this subject based on the ideXlab platform.
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Performance study and application of new coal-fired boiler flue gas heat recovery system
Applied Energy, 2017Co-Authors: Maolin Wei, Xiling Zhao, Lin Fu, Shigang ZhangAbstract:The recovery of heat from the flue gas is an effective way to improve the thermal efficiency of a boiler. In a coal-fired boiler with wet-Desulphurization, a portion of the flue gas thermal energy is used for the latent heat process, which leads to temperature reduction and humidity increase. Although it still contains significant heat, flue gas without sulfur cannot be further utilized; as such, in conventional systems, it is directly exhausted. This paper proposes a new system that utilizes the remaining heat in sulfur-reduced flue gas, where direct-contact heat transfer and absorption technologies are used to even further reduce the exhausted flue gas temperature. Here, not only is the heat recovered, but waste water is also reused as the make-up water in the flue gas Desulphurization (FGD) tower. An engineering application analysis provides a detailed account of the system thermodynamic characteristics, economic profitability, and pollutant emission reduction effects. The results show that the boiler efficiency improves by 3.2 percentage point when the exhaust temperature decreases to 39 °C. Also, the pressure drop in the heat exchanger remains below 400 Pa, which results in low extra electricity consumption. The direct-cooling treatment removes 59% of sulfur dioxide and 8.8% of nitrogen dioxide. The investment is 28.8 million RMB and the annual net revenue is 7.4 million RMB, with a static payback period of 3.8 years; as such, it is commercially viable. In summary, the new system simultaneously saves energy, saves water, and reduces pollutant emissions.
Da G Zollinge - One of the best experts on this subject based on the ideXlab platform.
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potential use of stockpiled circulating fluidized bed combustion ashes in manufacturing compressed earth bricks
Construction and Building Materials, 2009Co-Authors: Chang Seo Sho, Do Saylak, Da G ZollingeAbstract:Abstract There is currently 123 million tons of coal combustion by-products produced in US each year. Among these include fly ash, bottom ash, boiler slag, and flue gas Desulphurization material. Of that approximately 40% are utilized as a construction material in cement manufacturing, roadway construction, and others. However, the utilization of some ashes such as those produced by fluidized bed combustion has been limited due to their inherent high sulfate and carbon content. This paper is aimed at the evaluation of the potential use of stockpiled circulating fluidized bed combustion ash (SCFBCA) to develop compressed earth brick (CEB). Laboratory tests were conducted to determine the physical, chemical, and mineralogical properties with respect to SCFBCA. A series of tests were carried out to evaluate the properties of the bricks related to filler and binder types on compressive strength, density, and absorption. Test results indicate that SCFBCA can be used to manufacture CEB. Subordinately, test results may provide a means to reduce a waste disposal problem while providing the brick industry with a new, useful, low cost raw material.
Yongchil Seo - One of the best experts on this subject based on the ideXlab platform.
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mercury co beneficial capture in air pollution control devices of coal fired power plants
International Journal of Coal Geology, 2017Co-Authors: Deepak Pudasainee, Ha Na Jang, Yongchil Seo, Jin Ho Sung, Rajender GuptaAbstract:Abstract Coal contains trace amount of mercury (Hg). Hg compounds in coal combustion flue gas are speciated into elemental (Hgo), oxidized (Hg2+), and particle-bound (Hgp). Air pollution control devices (APCDs) installed for removing NOx, particulate matter and SOx have a co-beneficial effect on Hg capture. In this paper Hg emission and speciation across APCDs in coal-fired power plants in S. Korea were measured; total emission and the co-beneficial control in existing APCDs were estimated for the year 2013. Hg concentration in flue gas at the outlet of the boiler and stack ranged from 7.5 to 9.9 μg/Sm3 and 1.0 to 1.2 μg/Sm3, respectively. APCDs (selective catalytic reactor (SCR) + electrostatic precipitator (ESP) + wet flue gas Desulphurization (FGD)) were able to capture 80.8% of Hg as a co-beneficial control. SCR, ESP, and wet FGD independently and in a group promoted co-beneficial Hg control. Annually, 7.2 t of Hg was captured as a co-beneficial control in existing APCDs of coal-fired power plants in South Korea. Even though, Hg co-beneficial controls in plants with advanced APCDs are significant, emphasis should be given for the direct control of Hg.
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effect of selective catalytic reactor on oxidation and enhanced removal of mercury in coal fired power plants
Fuel, 2010Co-Authors: Deepak Pudasainee, Sung Jun Lee, Sang Hyeob Lee, Jeong Hun Kim, Ha Na Jang, Sung Jin Cho, Yongchil SeoAbstract:The present study investigated the variation of mercury (Hg) speciation within the air pollution control devices (APCDs) in bituminous coal-fired power plants. The effect of selective catalytic reduction (SCR) system, which is mainly installed for NOx removal, on elemental Hg (Hg0) oxidation and enhancement of Hg removal within APCDs, was studied. Hg speciations in flue gas at the inlet and outlet of each APCDs, such as SCR, cold-side electrostatic precipitator (CS-ESP) and flue gas Desulphurization (FGD), were analyzed. Sampling and analysis were carried out according to Ontario Hydro Method (OHM). Overall Hg removal efficiency of APCDs, on average, was about 61% and 47% with and without SCR system, respectively. In the flue gas, Hg was mainly distributed in gaseous (elemental and oxidized) form. The oxidized to elemental Hg partitioning coefficient increased due to oxidation of Hg0 across the SCR system and decreased due to the removal of oxidized Hg (Hg2+) across a wet FGD system. Hg0 oxidation across the SCR system varied from 74% to 7% in tested coal-fired power plants. The comparative study shows that the installation of an SCR system increased Hg removal efficiency and suppressed the reemission of captured Hg0 within a wet FGD system.