Experimental study on gas–solids flows in a circulating fluidised bed using electrical capacitance tomography

Wang, Cuiping; Lv, Zian; Ding-kai, LI

doi:10.1016/j.powtec.2007.10.007

Cited by 28 publications

(8 citation statements)

References 8 publications

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“…There exists a demand for noncircular sensors, for example, the cross sections of the pipes in the power industry or chemical reactors are square or rectangular Wang, Lv, & Li, 2008). However, direct calculation of the scattering transform from measured capacitances in the case of a noncircular sensor, for example, an elliptical region, is very complicated (Murphy, Mueller, & Newell, 2007).…”

Section: Introductionmentioning

confidence: 99%

Direct methods for image reconstruction in electrical capacitance tomography

Cao¹,

Xu²

2015

Industrial Tomography

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Section: Introductionmentioning

confidence: 99%

Direct methods for image reconstruction in electrical capacitance tomography

Cao¹,

Xu²

2015

Industrial Tomography

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“…Like other modalities, the research has involved both the process industry [ 2 – 8 ] and biomedical tissue imaging, which this article is going to focus on. The MIT modality is categorized as a passive imaging modality together with Electrical Impedance Tomography (EIT) [ 9 – 13 ], Electrical Capacitance Tomography (ECT) [ 14 , 15 ] and Magnetostatic Permeability Tomography (MPT) [ 16 – 18 ]. All these modalities are sensitive to all three passive electromagnetic properties which are conductivity, permittivity and permeability of the material where in this article the interest is on biological tissues.…”

Section: Introductionmentioning

confidence: 99%

Advancements in Transmitters and Sensors for Biological Tissue Imaging in Magnetic Induction Tomography

Zakaria

Rahim

Mansor

et al. 2012

Sensors

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Magnetic Induction Tomography (MIT), which is also known as Electromagnetic Tomography (EMT) or Mutual Inductance Tomography, is among the imaging modalities of interest to many researchers around the world. This noninvasive modality applies an electromagnetic field and is sensitive to all three passive electromagnetic properties of a material that are conductivity, permittivity and permeability. MIT is categorized under the passive imaging family with an electrodeless technique through the use of excitation coils to induce an electromagnetic field in the material, which is then measured at the receiving side by sensors. The aim of this review is to discuss the challenges of the MIT technique and summarize the recent advancements in the transmitters and sensors, with a focus on applications in biological tissue imaging. It is hoped that this review will provide some valuable information on the MIT for those who have interest in this modality. The need of this knowledge may speed up the process of adopted of MIT as a medical imaging technology.

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“…The internal structures in CFB desulfurization reactors are mostly ring-shaped with the aim to improve the gas−solid contact efficiency through enhanced solids mixing and prolonged particle residence time . Wang et al reported that the solids concentration distribution in a square CFB reactor was measured along the reactor height by optical fiber probes and electrical capacitance tomography (ECT) measurements at ambient temperature to determine the optimal CFB reactor structure. , Furthermore, various internal structures were modeled in a 2D reactor to investigate the moderate temperature desulfurization process . However, these cold-state gas−solid measurements and 2D numerical simulations were difficult to fully reflect the real moderate temperature CFB-FGD process with the rapidly hydrated sorbent, mainly due to the simplified assumptions of the sorbent particle characteristics and the gas−solid fluidization regime.…”

Section: Introductionmentioning

confidence: 99%

Effect of Internal Structure on Flue Gas Desulfurization with Rapidly Hydrated Sorbent in a Circulating Fluidized Bed at Moderate Temperatures

Zhang¹,

You²,

Chen³

2010

Ind. Eng. Chem. Res.

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A moderate-temperature desulfurization process at 600-800 °C was studied in a pilot-scale circulating fluidized bed flue gas desulfurization (CFB-FGD) experimental facility with the addition of the internal structure. The rapidly hydrated sorbent and the desulfurization products were analyzed to clarify the influence mechanism of the internal structure on the moderate-temperature desulfurization process. The results show that the desulfurization efficiency with the internal structure at 600-800 °C was 74-93% for the calcium to sulfur (Ca/S) molar ratio of 2.0, which was higher than the desulfurization efficiency without the internal structure of 67-83%. As for the calcium-containing compositions, the desulfurization products included about 70% cyclone recirculation sample and about 30% bag filter sample. The cyclone recirculation sample was mainly composed of CaSO 4 and CaO. The bag filter sample not only contained high contents of CaSO 4 and CaO but also contained a considerable amount of CaCO 3 and even some unreacted Ca(OH) 2 . With the addition of the internal structure, the calcium conversion rate of the cyclone recirculation sample greatly increased from 42.8 to 47.4% while that of the bag filter sample just increased from 29.4 to 30.7%. It demonstrated that the main contributor for the improved desulfurization efficiency was the cyclone recirculation sample due to the improved solids concentration distribution and the enhanced gas-solid contact efficiency. The calcium conversion rate for the bag filter sample depended on the solids concentration distribution as well as the particle residence time in the moderate temperature range, which indicated that prolonging the particle residence time for the fresh sorbent and the fall off calcium-containing particles was important to further improve the desulfurization performance. These results provided good guidance for realizing high desulfurization efficiency and low flow resistance in dry FGD processes.

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Experimental study on gas–solids flows in a circulating fluidised bed using electrical capacitance tomography

Cited by 28 publications

References 8 publications

Direct methods for image reconstruction in electrical capacitance tomography

Direct methods for image reconstruction in electrical capacitance tomography

Advancements in Transmitters and Sensors for Biological Tissue Imaging in Magnetic Induction Tomography

Effect of Internal Structure on Flue Gas Desulfurization with Rapidly Hydrated Sorbent in a Circulating Fluidized Bed at Moderate Temperatures

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