Experimental study on SO2 recovery using a sodium–zinc sorbent based flue gas desulfurization technology

Yang, Zhigang; Wang, Tao; Yang, Hairui; Zhang, Hai; Zhang, Xuyi

doi:10.1016/j.cjche.2014.10.007

Cited by 13 publications

(5 citation statements)

References 23 publications

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“…As shown in Table 1, many scholars have studied the flue gas desulfurization process by experiment or simulation [25][26][27][28][29]. Table 1 shows that research on circulating fluidized bed flue gas desulfurization is mostly focused on improving the adsorbent's adsorbability [30][31][32][33][34][35][36][37], improving the pore structure of the adsorbent [31,[38][39][40], and establishing different desulfurization models [41][42][43] to improve the utilization rate of the desulfurizing agent. Li et al [42] established a mass balance model using fast hydrating adsorbents, and predicted the system status from the aspects of particle wear, particle residence time, particle segregation, and the desulfurization process, and optimized operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

et al. 2021

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In view of the current status of catalytic cracking flue gas treatment, it is necessary to study the flow environment of desulfurization ash particles, which are a type of Geldart C particle, in a circulating fluidized bed (CFB) for semi-dry flue gas desulphurization using CFB technology. This study investigated the flow characteristics of desulphurization ash particles in a riser with an inner diameter of 70 mm and a height of 12.6 m, at a gas velocity of 4–7 m/s and a solids circulation rate of 15–45 kg/m2·s. The solids holdup in the axial distribution is relatively high near the bottom of the riser, and gradually decreases as the riser height increases, with a stable value from the middle to the top of the riser. In the radial distribution, the solids holdup of desulfurization ash particles is low in the center and high in the wall region. Within the above operating conditions, the solids holdup ranges from 0.008 to 0.025. The particle-based Archimedes number has a linear relationship with the solids holdup at all operating conditions.

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Section: Introductionmentioning

confidence: 99%

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

et al. 2021

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“…4 Like gas permeation discussed above, the membrane mass transfer coefficients are also proportional to membrane porosity and inversely proportional to membrane thickness and membrane tortuosity. Because the absorption time was 30 min, the SO 2 absorption flux of PES membrane was 8.67E-4 mol/m 2 s, but the SO 2 absorption flux of PES/fSiO 2 organic–inorganic composite membrane was 7.87E-4 mol/m 2 s. The membrane mode of operation was assumed to be non-wetted case, owing to the shorter operation time (30 min). The membrane mass transfer coefficient of PES/fSiO 2 organic–inorganic composite membrane was lower than the membrane mass transfer coefficient of the PES membrane because of the lower gas permeation deduced previously.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characterization of poly(ether sulfone)/fluorinated silica organic–inorganic composite membrane for sulfur dioxide desulfurization

et al. 2018

High Performance Polymers

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The highly hydrophobic poly(ether sulfone)/fluorinated silica (PES/fSiO2) organic–inorganic composite membrane for sulfur dioxide (SO2) desulfurization was prepared by incorporating the fSiO2 particles on the PES membrane via sol–gel process and fluorination. The formation of PES/fSiO2 organic–inorganic composite membrane was examined by attenuated total reflectance Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermal gravimetric analysis, field-emission scanning electron microscopy, and water contact angle. The experimental results showed that the fSiO2 inorganic layer was tightly bonded to the PES membrane surface through silane chemical reactions. The incorporation of the fSiO2 inorganic layer on the PES membrane surface increases the surface roughness and reduces the surface free energy because of the hydrophobic dodecafluoroheptyl-propyl-trimethoxysilane. The hydrophobicity of the PES/fSiO2 composite membrane was dramatically enhanced from 78.0° of PES membrane to 128.2° of PES/fSiO2 membrane. Compared with PES membrane, the desulfurization performance of PES/fSiO2 membrane was investigated. PES/fSiO2 organic–inorganic composite membrane indicated a reasonably stable SO2 absorption flux of 7.69E-4 mol/m2 s during the 240-min-long time operation.

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“…The adsorption processes are already used and are well known for SO 2 removal as well as for H 2 S removal. Common sorbents for SO 2 removal are mostly calcium-based oxide/hydroxide (CaO/Ca(OH) 2 ), zinc oxide-based (ZnO), sodium hydroxide based (NaOH) and ammonia-based [3]. Limestone, slaked lime or a mixture of slaked lime with fly ash is commercially used in FGD systems [4].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Raw and Calcined Chicken Eggshell for Sulfur Dioxide and Hydrogen Sulfide Removal at Low Temperature

et al. 2021

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Chicken eggshell (ES) is a waste from the food industry with a high calcium content produced in substantial quantity with very limited recycling. In this study, eco-friendly sorbents from raw ES and calcined ES were tested for sulfur dioxide (SO2) and hydrogen sulfide (H2S) removal. The raw ES was tested for SO2 and H2S adsorption at different particle size, with and without the ES membrane layer. Raw ES was then subjected to calcination at different temperatures (800 °C to 1100 °C) to produce calcium oxide. The effect of relative humidity and reaction temperature of the gases was also tested for raw and calcined ES. Characterization of the raw, calcinated and spent sorbents confirmed that calcined eggshell CES (900 °C) showed the best adsorption capacity for both SO2 (3.53 mg/g) and H2S (2.62 mg/g) gas. Moreover, in the presence of 40% of relative humidity in the inlet gas, the adsorption capacity of SO2 and H2S gases improved greatly to about 11.68 mg/g and 7.96 mg/g respectively. Characterization of the raw and spent sorbents confirmed that chemisorption plays an important role in the adsorption process for both pollutants. The results indicated that CES can be used as an alternative sorbent for SO2 and H2S removal.

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Experimental study on SO2 recovery using a sodium–zinc sorbent based flue gas desulfurization technology

Cited by 13 publications

References 23 publications

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

Preparation and characterization of poly(ether sulfone)/fluorinated silica organic–inorganic composite membrane for sulfur dioxide desulfurization

Valorization of Raw and Calcined Chicken Eggshell for Sulfur Dioxide and Hydrogen Sulfide Removal at Low Temperature

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