Particle motion in L-valve as observed by positron emission particle tracking

Chan, Chian W.; Seville, Jonathan; Fan, Xianfeng; Baeyens, Jan

doi:10.1016/j.powtec.2009.02.016

Cited by 29 publications

(8 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cyclones [89][90][91][92][93][94][95][96] Standpipes [98][99][100][101][102][103][104][105] L-valves [106][107][108][109][110][111][112][113] 3. Stack emissions: Problems and remedies…”

Section: Auxiliary Equipment Contributionsmentioning

confidence: 99%

Fluidized bed waste incinerators: Design, operational and environmental issues

Caneghem

Brems

Lievens

et al. 2012

Progress in Energy and Combustion Science

185

View full text Add to dashboard Cite

show abstract

“…Cyclones [89][90][91][92][93][94][95][96] Standpipes [98][99][100][101][102][103][104][105] L-valves [106][107][108][109][110][111][112][113] 3. Stack emissions: Problems and remedies…”

Section: Auxiliary Equipment Contributionsmentioning

confidence: 99%

Fluidized bed waste incinerators: Design, operational and environmental issues

Caneghem

Brems

Lievens

et al. 2012

Progress in Energy and Combustion Science

185

View full text Add to dashboard Cite

show abstract

“…The 3-D particles trajectories in mixing process in a powder, a biscuit crumble and a liquid slurry have been obtained. Since then PEPT has been applied to investigate the flow in a variety of equipment and processes, including rotating drums [43][44][45], various type of mixers [46][47][48][49][50][51], fluidized beds for various purposes [52][53][54], extrusion systems [55], stirred grinding mills [56], stirred vessels [57,58], the pharmaceutical Wurster coating system [59], rolling foodstuff cans [60], multiphase stirred tank reactors [61], casting [62][63][64], pipes [65,66], valves [67] and twin screw granulators [68].…”

Section: Introduction To Peptmentioning

confidence: 99%

Particle flow in a hydrocyclone investigated by positron emission particle tracking

Chang

Ilea

Aasen

et al. 2011

Chemical Engineering Science

View full text Add to dashboard Cite

The single-phase flow field in a hydrocyclone was studied numerically using the LES turbulence model. The hydrocyclone geometry and flow conditions are in accordance with previous experimental work. An important phenomenon in cyclone operation, the "end of the vortex," observed in experiments was reproduced in the simulations, where the vortex end deviated from the vortex axis and bent to the wall of the hydrocyclone body. As the vortex end attached to the wall, its rotation (precession) was visualized by monitoring the motion of the low-pressure spot caused by the vortex core on the wall.

show abstract

“…For FCD, several studies had examined the effect of FCD structure and operating parameters on particle flow characteristics, solid circulation rate, and operational stability. [3][4][5][6][7] Ende pulverized coal gasifier (EPCG), as a kind of AT-CFBG, has been widely used in gasification field. However, the return conduit of EPCG is generally not equipped with FCD.…”

Section: Introductionmentioning

confidence: 99%

“…If the solid inventory is too low to form a pressure barrier, part of the flue gas from the furnace will pass through the return conduit and reduce the cyclone efficiency. [8][9][10] In this process, the furnace pressure and coal feeding rate will affect the solid circulation effect, and the flue gas flow can easily flow back to the cyclone separator through the return conduit, thereby reducing the solid circulation rate and even causing serious mass and pressure fluctuations. The above issues increase the unburned combustible of fly ash and fly ash discharge, reducing the economic benefits of EPCG and the effective syngas concentration.…”

Section: Introductionmentioning

confidence: 99%

“…Since the pressure at the bottom of AT‐CFBG is greater than the pressure at the return conduit outlet, a feedback control device (FCD) is commonly installed to prevent recirculation at the furnace bottom, which plays a key role in stabilizing the solid circulation process and increasing the solid circulation rate ( G s ). For FCD, several studies had examined the effect of FCD structure and operating parameters on particle flow characteristics, solid circulation rate, and operational stability 3–7 …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gas/particle flow and pressure variation characteristics of Ende pulverized coal gasifier equipped with ejector

Song

Tang

Liu

et al. 2023

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Ende pulverized coal gasifier (EPCG), as a typical representative of circulating fluidized bed gasifier, has been widely used in gasification field. The return conduit of EPCG is generally not equipped with a feedback control device (FCD), which tends to result in a low solid circulation rate (Gs) and high unburned combustibles in fly ash. To address these issues, a new technique using the ejector as the FCD was designed to provide a stable pressure barrier and improve solid circulation. Preliminary thermal experiments demonstrated the feasibility of improving the EPCG with injector system. Currently, the specific mechanisms that contribute to further optimize this technology have not been systematically studied. Considering the large impact of ejector operation on solid circulation rate and stability as well as syngas production, this work adopts a gas/particle 1:15 cold EPCG bench to investigate the gas/particle flow and pressure variation characteristics before and after ejector operation and under different working medium pressures (Pp). When the ejector operates at the design pressure Ps = 0.187 MPa, the outlet pressure of the return conduit is slightly larger than the furnace bottom pressure, thus preventing the reverse gas flow at the furnace bottom. The particle velocity and concentration distribution in the furnace are basically consistent with that without the ejector, showing a similar central spout region and near‐wall annulus flow region. As Pp increases from 0.04 to 0.24 MPa, the average particle velocity in the return conduit increases from 0.95 to 2.4 m/s, the particle concentration decreases from 0.088 to 0.051, and the solid circulation rate increases from 0.37 to 0.53 kg/h. The ejector outlet pressure gradually increases, the inlet pressure decreases, and the pressure barrier provided by the ejector rises from 1052 to 3640 Pa. When Pp is 0.12 MPa, the ratio of GN2/Gair is 0.91%, which can achieve the purpose of continuous and stable pressurization with a small amount of nitrogen.

show abstract

Particle motion in L-valve as observed by positron emission particle tracking

Cited by 29 publications

References 17 publications

Fluidized bed waste incinerators: Design, operational and environmental issues

Fluidized bed waste incinerators: Design, operational and environmental issues

Particle flow in a hydrocyclone investigated by positron emission particle tracking

Gas/particle flow and pressure variation characteristics of Ende pulverized coal gasifier equipped with ejector

Contact Info

Product

Resources

About