A Novel Radial Adsorber with Parallel Layered Beds for Prepurification of Large-Scale Air Separation Units

Tian, Qiqi; He, Guogeng; Wang, Zhiping; Cai, Dehua; Chen, Liping

doi:10.1021/acs.iecr.5b00555

Cited by 15 publications

(11 citation statements)

References 39 publications

(91 reference statements)

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“…The calculation results show that this design can effectively solve the problem of uneven flow field. Tian et al [16] proposed a novel radial adsorber by parallel layered beds. By the numerical simulation analysis, the results showed that this design could better meet the requirements of large-scale air separation in terms of achieving good pre-purification performance under the premise of low energy consumption.…”

Section: Gravity Directionmentioning

confidence: 99%

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Numerical Investigation into the Distributor Design in Radial Flow Adsorber

sci¹

2019

AAMM

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Air flow distribution in radial flow adsorber was numerically investigated using computational fluid dynamics (CFD) method, which was proved to be applicable to study the problem of non-uniform distribution in radial flow adsorber. Results showed that the degree of non-uniformity was more serious in desorption process than that is adsorption process. Therefore, it was considered that the non-uniform distribution of flow in a radial flow adsorber was mainly manifested in the desorption process. Optimum design of distributor parameters can improve the flow distribution in adsorber. Meanwhile, three different structures of distributor and the effect of breathing valve were analyzed. Results revealed that truncated cone is more effective than tubular and conical distributors in flow distribution. By inserting the truncated cone in central channel, desorption uniformity was increased by 6.56% and the breakthrough time of CO 2 was extended from 564s to 1138s in the adsorption process. The "dead zone" problem at the top of adsorber during the desorption process was solved by opening breathing valve, which prolonged the working life of adsorber and was proved to have less effect on the uniform of airflow.

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Section: Gravity Directionmentioning

confidence: 99%

“…The relevant sizes are shown in Tables 1-2. A two-dimensional (2D) axisymmetric finite element model has proven to be applicable by Tang [14], Tian [16] and Li [17]. Comparing with 3D model, 2D axisymmetric model can reduce computational complexity and shorten the computing period.…”

Section: Cfd Simulation Of Adsorption and Desorption Process 21 Geommentioning

confidence: 99%

Numerical Investigation into the Distributor Design in Radial Flow Adsorber

sci¹

2019

AAMM

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“…In addition to that, Sakwa-Novak et al evaluated a At present, RFRs have not been investigated for the application of CO 2 direct air capture. In the past two decades, RFRs were studied in some research papers and patents for, e.g., (1) configurations for a uniform flow distribution [31][32][33], (2) the application of catalytic reactions to produce naphtha [34,35], xylenes [36], methanol [37], or hydrogen [38], and (3) the application of air purification (prior to the cryogenic air separation unit) [39]. No other studies evaluated RFRs for DAC using a supported amine sorbent.…”

Section: Introductionmentioning

confidence: 99%

A Radial Flow Contactor for Ambient Air CO2 Capture

Brilman

2020

Applied Sciences

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Direct air capture (DAC) of CO2 can address CO2 emissions from distributed sources and produce CO2 from air virtually anywhere that it is needed. In this paper, the performance of a new radial flow reactor (RFR) for CO2 adsorption from ambient air is reported. The reactor uses a supported amine sorbent and is operated in a batch mode of operation or semi-continuously, respectively without or with sorbent circulation. The radial flow reactor, containing 2 kg of the adsorbent, is successfully scaled up from the experimental results obtained with a fixed bed reactor using only 1 g of the adsorbent. In the batch operation mode, the sorbent in the annular space of the RFR is regenerated in situ. With sorbent circulation, the RFR is loaded and unloaded batchwise and only used as an adsorber. A sorbent batch loaded with CO2 is transported to and regenerated in an external (fluid bed) regenerator. The RFR unit is characterized by a low contacting energy (0.7–1.5 GJ/ton-CO2) and a relatively short adsorption time (24–43 min) compared to other DAC processes using the same types of sorbents. The contactor concept is ready for further scale-up and continuous application.

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“…In contrast, radial flow adsorber (RFA) has the characteristics of large cross-sectional area, large flow capacity, gas distribution uniformity, small flow resistance and large feed flowrate [4,5]. It has been widely used in chemical industry, petrochemical and gas production industry [6,7]. However, due to the extremely complex variable mass flow caused by the internal structure of RFA, one of the most important issues to be solved for heat and mass transfer in two-phase flow in RFA is model verification [8].…”

Section: Introductionmentioning

confidence: 99%

3-D Modeling of Gas–Solid Two-Phase Flow in a π-Shaped Centripetal Radial Flow Adsorber

Wang

Yang

et al. 2020

Applied Sciences

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Radial flow adsorber (RFA) is widely used in large-scale pressure swing adsorption (PSA) oxygen production system because of high air separation. In this study, a 3-D modeling of gas–solid two-phase flow was established for the π-shaped centripetal RFA (CP-π RFA). The pressure difference, temperature changes, velocity profiles and oxygen distributions were comparatively studied using this model. Part of the results have been compared with the experiments results, which shows this model can give an accurately prediction. The results show that the pressure and velocity in the adsorber change greatly near the outer hole and central hole, but the overall pressure and velocity changes in the bed are stable. The oxygen product purity in the adsorbent filling area performed better on oxygen enrichment after eight cycles. The oxygen product flow rate will affect the oxygen production performance. The laws of the pressure, velocity, temperature and oxygen distributions can provide an important technical reference for CP-π RFA in the PSA for oxygen production.

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A Novel Radial Adsorber with Parallel Layered Beds for Prepurification of Large-Scale Air Separation Units

Cited by 15 publications

References 39 publications

Numerical Investigation into the Distributor Design in Radial Flow Adsorber

Numerical Investigation into the Distributor Design in Radial Flow Adsorber

A Radial Flow Contactor for Ambient Air CO2 Capture

3-D Modeling of Gas–Solid Two-Phase Flow in a π-Shaped Centripetal Radial Flow Adsorber

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