Cold Model Performance Test of 50 KWe Dual Fluidized Bed Gasification Technology

Abstract The results of investigations on solids flow in a cold model of the dual fluidized bed reactor designed for chemical looping combustion of solid fuels (DFB-CLC-SF) are presented in this paper. The constructed unit consists of two interconnected reactors. The first one, so-called fuel reactor (FR), is operated under bubbling fluidized bed (BFB) conditions, whereas the second one, so-called air reactor (AR), is structurally divided into two sections. The bottom part of AR works under BFB while the upper part, i.e., the riser, is operated in the fast fluidized bed (FFB) regime. In these studies, the air was used for fluidization process in all parts of the DFB-CLC-SF reactor. The glass beads with similar parameters to oxygen carriers (OCs) used in the CLC process were utilized as an inventory. The fluidization conditions are controlled by using the sets of pressure sensors installed around the circulation loop. The experimental data acquired in the tests are further employed to the analysis of solids behavior in a cold model of the DFB-CLC-SF reactor. The main goal of these studies was to establish the conditions for smooth fluidization, which concurrently provide the required residence time of solids in both reactors that is one of the most crucial factors in the CLC process. It was found that the fluidizing gas velocity in reactors has a significant impact on solids behavior and the investigated parameters. However, what is the most important, it was confirmed that the operation condition of the DFB-CLC-SF reactor can be adjusted to meet the requirements resulting from the properties of OCs.

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Hydrodynamic Properties in a Cold-Model Dual Fluidized-Bed Gasifier

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN ◽

10.1252/jcej.07we111 ◽

2008 ◽

Vol 41 (7) ◽

pp. 686-690 ◽

Cited By ~ 19

Author(s):

Jeong Hoi Goo ◽

Myung Won Seo ◽

Dong Kyoo Park ◽

Sang Done Kim ◽

See Hoon Lee ◽

...

Keyword(s):

Fluidized Bed ◽

Hydrodynamic Properties ◽

Cold Model ◽

Dual Fluidized Bed ◽

Fluidized Bed Gasifier

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Fluid-Dynamic Investigations in a Scaled Cold Model for a Dual Fluidized Bed Biomass Steam Gasification Process: Solid Flux Measurements and Optimization of the Cyclone

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.1394 ◽

2007 ◽

Vol 5 (1) ◽

Cited By ~ 9

Author(s):

Andreas Kreuzeder ◽

Christoph Pfeifer ◽

Hermann Hofbauer

Keyword(s):

Fluidized Bed ◽

Circulating Fluidized Bed ◽

Separation Efficiency ◽

Fluid Dynamic ◽

Steam Gasification ◽

Circulation Rate ◽

Cold Model ◽

Gasification Process ◽

Dual Fluidized Bed ◽

Bed Material

Gasification of biomass is an attractive technology for combined heat and power (CHP) production. A dual fluidized bed steam gasifier is in commercial operation at the biomass CHP plant in Guessing/Austria since 2002. For circulating fluidized bed applications the bed material consumption is economically crucial. Thus, cyclones for circulating fluidized beds need to be designed properly. Some erosion and caking in the cyclone of the gasifier could be observed with increasing hours of operation. The influences of these effects as well as the influence of the solid circulation rate between the two units on the separation efficiency were investigated by fluid-dynamic investigations using a scaled cold model. The results show that due to erosion and caking elutriation rates are increased, especially for smaller particles. However, the cyclone achieves fractional separation efficiencies of more than 99.9%.

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Hydrodynamic characteristics in a cold model of the dual fluidized bed with mixed particles

Powder Technology ◽

10.1016/j.powtec.2019.04.015 ◽

2019 ◽

Vol 351 ◽

pp. 291-304 ◽

Cited By ~ 4

Author(s):

Xin Yang ◽

Zherui Ma ◽

Zhanwei Liang ◽

Hongwei Chen ◽

JiXuan Wang

Keyword(s):

Fluidized Bed ◽

Hydrodynamic Characteristics ◽

Cold Model ◽

Dual Fluidized Bed

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Cold model hydrodynamic studies of a 200 kWth dual fluidized bed pilot plant of calcium looping process for CO2 Capture

Powder Technology ◽

10.1016/j.powtec.2013.10.043 ◽

2014 ◽

Vol 253 ◽

pp. 116-128 ◽

Cited By ~ 17

Author(s):

Ajay R. Bidwe ◽

Craig Hawthorne ◽

Heiko Dieter ◽

Miguel A.M. Dominguez ◽

Mariusz Zieba ◽

...

Keyword(s):

Fluidized Bed ◽

Co2 Capture ◽

Pilot Plant ◽

Cold Model ◽

Calcium Looping ◽

Dual Fluidized Bed

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Effect of fluidizing velocity on gas bypass and solid fraction in a dual fluidized bed gasifier and a cold model

Particuology ◽

10.1016/j.partic.2014.05.007 ◽

2015 ◽

Vol 18 ◽

pp. 58-65 ◽

Cited By ~ 11

Author(s):

Mook Tzeng Lim ◽

Woei-Lean Saw ◽

Shusheng Pang

Keyword(s):

Fluidized Bed ◽

Solid Fraction ◽

Cold Model ◽

Dual Fluidized Bed ◽

Fluidized Bed Gasifier

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Development of Biomass Gasification Technology with Fluidized-Bed Reactors for Enhancing Hydrogen Generation: Part I, Hydrodynamic Characterization of Dual Fluidized-Bed Gasifiers

Applied Sciences ◽

10.3390/app10010002 ◽

2019 ◽

Vol 10 (1) ◽

pp. 2 ◽

Cited By ~ 4

Author(s):

Yau-Pin Chyou ◽

Der-Ming Chang ◽

Po-Chuang Chen ◽

Hsiu-Yun Chien ◽

Keng-Tung Wu ◽

...

Keyword(s):

Fluidized Bed ◽

Hydrogen Generation ◽

Clean Energy ◽

Chemical Conversion ◽

Biomass Gasification ◽

Experimental Results ◽

Hydrodynamic Characteristics ◽

Fluidized Bed Reactors ◽

Cold Model ◽

Gasification Technology

Various means for enhancing hydrogen content in the syngas from gasification of solid biomass in fluidized-bed reactors were investigated in this study. Steam or oxygen-rich gas can be supplied as gasification medium, to improve the syngas characteristics. Alternatively, a so-called “indirect gasification technology” realizes the thermo-chemical conversion processes in dual reactors, respectively, for combustion and gasification, where gaseous streams in between are separated while solid materials are circulated through. Hence, with air as oxidant for combustion this system features the advantage of producing nearly nitrogen-free syngas. Baseline experiments were firstly carried out to identify performance features; then, parametric studies were conducted and positive trends for enhancing hydrogen generation via biomass gasification were revealed. Moreover, hydrodynamic characteristics in dual reactors were comprehensively envisaged in the cold-flow models to facilitate subsequent investigation into thermo-chemical processes. The experimental results indicated that the circulation mass of the bed material driven by the operating air exceeded the design value, which gave a comfortable safety factor of the engineering design. In addition, the average pressure distribution measured by the cyclic operation of the system was similar to that of the published literature. Based on the experimental results of the cold model, the suggestions of the operating tests in the hot model were addressed. Further efforts will be pursued to establish databases for clean energy and carbon abatement technologies.

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Hydrodynamic properties of a cold model of dual fluidized bed gasifier: A modeling and experimental investigation

Chemical Engineering Research and Design ◽

10.1016/j.cherd.2016.04.002 ◽

2016 ◽

Vol 109 ◽

pp. 791-805 ◽

Cited By ~ 5

Author(s):

Siddhartha Shrestha ◽

Brahim Si Ali ◽

Badrul Mohamed Jan ◽

MookTzeng Lim ◽

Khalid El Sheikh

Keyword(s):

Experimental Investigation ◽

Fluidized Bed ◽

Hydrodynamic Properties ◽

Cold Model ◽

Dual Fluidized Bed ◽

Fluidized Bed Gasifier

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Steam Gasification of Biomass Coupled with Lime-Based CO2 Capture in a Dual Fluidized Bed: A Modeling Study

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.716-717.142 ◽

2014 ◽

Vol 716-717 ◽

pp. 142-145

Author(s):

Xiao Ming Wang ◽

Xian Bin Xiao ◽

Xu Jiao Chen ◽

Ji Liu ◽

Wen Yan Li

Keyword(s):

Renewable Energy ◽

Fluidized Bed ◽

Hydrogen Content ◽

Co2 Capture ◽

Theoretical Basis ◽

Aspen Plus ◽

Steam Gasification ◽

Operating Parameters ◽

Dual Fluidized Bed ◽

Gasification Technology

Biomass is an important renewable energy and making hydrogen-rich syngas from biomass is promising. Dual fluidized bed gasification technology can increase hydrogen content in the syngas. Moreover, steam gasification of biomass coupled with lime-based CO2 capture in a dual fluidized bed can further improve the syngas quality . This paper established a dual fluidized bed gasification model using Aspen plus,in order to explore the effect of different gasification temperatures and steam to biomass ratios on hydrogen content in syngas, providing a theoretical basis for the optimization of operating parameters and process.

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