Effects of riser height and total solids inventory on the gas–solids in an ultra-tall CFB riser

Hu, Nan; Zhang, Hai; Yang, Hairui; Shen, Yang; Yue, Guangxin; Lü, Junfu; Liu, Qing

doi:10.1016/j.powtec.2009.06.011

Cited by 36 publications

(12 citation statements)

References 31 publications

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“…As the total solids inventory increased, the hydrostatic pressure, which pushed particles from the bubbling bed to the riser through the pot-seal, increased, and increased the particle elutriation in the riser. Moreover, the extension of the dense zone in the riser was observed due to a higher solids inventory, which was consistent with the experimental observations [49][50][51].…”

Section: Effect Of Gas Velocity In the Bubbling Bedsupporting

confidence: 91%

Three-dimensional full loop simulation of solids circulation in an interconnected fluidized bed

et al. 2016

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract 3-D full loop CFD simulation of solids circulation rate is conducted in a complicated circulating-fluidized bed, which consists of a riser, a bubbling bed, a cyclone and a loop-seal. The effects of operating gas velocity, particle diameter and total solids inventory on the solids circulation rate are investigated based on the system pressure balance of an interconnected fluidized bed. CFD results indicate that the gas velocity in the riser plays a dominant role in controlling the solids circulation rate, whilst the gas velocity in the pot-seal influences in a narrow operating range. The solids circulation rate is strongly influenced by particle diameter and total solids inventory, but becomes insensitive to the operating conditions in the bubbling bed as the gas velocity is higher than the minimum fluidization velocity.

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Section: Effect Of Gas Velocity In the Bubbling Bedsupporting

confidence: 91%

Three-dimensional full loop simulation of solids circulation in an interconnected fluidized bed

et al. 2016

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“…The design of the Baima 600 MWe boiler was supported by a number of research projects on key technical points, which were addressed in the development of a supercritical boiler of this size [23]. For example, the gas-solid flow in an ultra-high riser was studied experimentally [24], the 3D heat flux profile in the large combustion chamber was subject of simulation work [25], the hydrodynamic safety of low mass flow of steam was examined [26], mal-distribution of flow among six cyclones in parallel was experimentally investigated [18,27] as well as the overturn of solids from one pant leg of the bottom section of the combustion chamber into the other [28].…”

Section: Fluidized-bed Combustion Reactorsmentioning

confidence: 99%

Fluidized‐Bed Reactors – Status and Some Development Perspectives

Werther

Hartge

Heinrich

2014

Chemie Ingenieur Technik

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This review of industrial applications of fluidized-bed reactors is focused on the fluid catalytic cracking (FCC) process and the fluidized-bed combustion. Both processes have a tremendous economic importance. In the FCC process, the main challenges are the increase of runtime, the adaption of the product spectrum to regional requirements of the market, and the adaption to heavier feedstocks. In fluidized-bed combustion the main trends are towards larger units sizes, higher efficiency, and further reduced emissions while keeping the boiler as flexible as possible with regard to the mixture of fuels.

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“…The difference of solid suspension density between 38 m and 54 m riser were experimentally studied in a cool 75t/h, 3220Pa 75t/h, 3830Pa 75t/h, 5680Pa 75t/h, 7330Pa CFB test rig with a 240 mm cross-section diameter [24]. Experimental results showed that when fluidization velocity exceeded the transport velocity, an S-shaped voidage profile characterized by fast fluidization was established in the riser, shown in Fig.…”

Section: Solid Suspension Density Of An Ultra Large Cfb Furnacementioning

confidence: 99%

Progress of circulating fluidized bed combustion technology in China: a review

Cai

Lyu

et al. 2017

Clean Energy

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Circulating fluidized bed (CFB) technology plays an important role in the utilization of low-grade coal in China. This article reviews CFB combustion technology development in China and summarizes recent achievements. Since 1990 Chinese engineers and researchers have been undertaking work to improve CFB boiler technology. A completely novel CFB boiler design theory was developed and used in the domestic manufacturing of CFB boilers with various capacities. China is the largest supplier and customer of CFB boilers in the world due to the widespread use of CFB boilers. In 2007, the lower energy consumption CFB technology was successfully developed by re-specifying the fluidization state, which reduced the power consumption of forced fans and solved the potential erosion problems on the water wall. Afterwards, in order to increase the electric power generation efficiency, the supercritical CFB (SCCFB) boiler was developed and the first 600 MW SCCFB boiler was demonstrated and put into commercial operation in 2013. The success of the technology is evident with over 80 SCCFB boilers on order with capacities of 350 MW to 660 MW. Chinese scientists and engineers are also developing technology to lower the emissions of CFB combustion to meet the requirements of China's strict emission regulations. This emission reduction is through high-efficiency desulfurization by limestone injection into the furnace and low NO x combustion, ultra-low emission of SO 2 and NO x in the furnace can be realized by improving the bed quality and increasing the solid circulation rate. There is currently further research and design development being undertaken to develop a 660 MW ultra-supercritical CFB (USCCFB) boiler. The new boiler is expected to be operational before 2020 resulting in higher efficiency and lower energy consumption and emissions.

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Effects of riser height and total solids inventory on the gas–solids in an ultra-tall CFB riser

Cited by 36 publications

References 31 publications

Three-dimensional full loop simulation of solids circulation in an interconnected fluidized bed

Three-dimensional full loop simulation of solids circulation in an interconnected fluidized bed

Fluidized‐Bed Reactors – Status and Some Development Perspectives

Progress of circulating fluidized bed combustion technology in China: a review

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