Experimental analysis of a bubbling fluidized bed gasification plant fed by biomass: Design, implementation and validation of the control system

Despite being a renewable source, biomass as fuel for power generation is still not completely exploited. In biomass gasification plants, control operations are crucial for the proper management of the plant. This paper describes the results of a regulation control applied to an experimental biomass bubbling fluidized bed (BFB) gasification plant. The aim of implementing the system is to improve the biomass gasification process, increasing the efficiency and ensuring the safety in the plant operation. The equivalence ratio (ER) is one of the main parameters in a gasification process. To improve the ER, the airflow input is controlled, measuring the air velocity through an anemometer. On the other hand, the biomass flow is controlled modifying the speed of the screw conveyor using an inverter for regulating the frequency of its electric motor. A PLC is used for programming the instructions to implement control functions and to store the data given by the measurement devices. Once implemented the control system, the biomass gasification plant could work either; manually o automatically, allowing to adjust ER, increasing efficiency of the process. Finally, some tests are done to validate the control system, using the acquired data to improve the process.

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Simulation of Enriched Air-Steam Biomass Gasification in a Bubbling Fluidized Bed Gasifier

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.699.510 ◽

2014 ◽

Vol 699 ◽

pp. 510-515

Author(s):

Miao Miao Niu ◽

Ya Ji Huang ◽

Bao Sheng Jin

Keyword(s):

Fluidized Bed ◽

Steam Injection ◽

Biomass Gasification ◽

Carbon Conversion ◽

Gasification Process ◽

Cold Gas Efficiency ◽

Oxygen Percentage ◽

Bubbling Fluidized Bed ◽

Gas Efficiency ◽

Cold Gas

A model was developed for the enriched air-steam biomass gasification in a bubbling fluidized bed (BFB) gasifier using Aspen Plus. Restricted equilibrium method was used to eliminate the deviation caused by the diffusion effect of gas-particle. The model has been divided into three stages (drying and pyrolysis, partial combustion and gasification) for predicting the gasifier performance. Simulation results for gas composition, carbon conversion and cold gas efficiency versus oxygen percentage and steam to biomass ratio (S/B) were compared with the experimental results. Higher oxygen percentage improves the gasification process, increases the production of H2 and CO and results in better gasification efficiency. With increasing oxygen percentage, the production of CO2 and CH4 show decreasing trends. Steam injection enhances the H2 and CO2 production but decreases CO and CH4 production. Carbon conversion presents a slight decrease trend over the S/B range, while cold gas efficiency is first constant and then decreased.

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Simulation of biomass gasification in bubbling fluidized bed reactor using aspen plus®

Energy Conversion and Management ◽

10.1016/j.enconman.2021.113981 ◽

2021 ◽

Vol 235 ◽

pp. 113981

Author(s):

M. Puig-Gamero ◽

D.T. Pio ◽

L.A.C. Tarelho ◽

P. Sánchez ◽

L. Sanchez-Silva

Keyword(s):

Fluidized Bed ◽

Aspen Plus ◽

Fluidized Bed Reactor ◽

Biomass Gasification ◽

Bubbling Fluidized Bed

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Particle behaviours of biomass gasification in a bubbling fluidized bed

Chemical Engineering Journal ◽

10.1016/j.cej.2021.131847 ◽

2021 ◽

pp. 131847

Author(s):

Dali Kong ◽

Kun Luo ◽

Shuai Wang ◽

Jiahui Yu ◽

Jianren Fan

Keyword(s):

Fluidized Bed ◽

Biomass Gasification ◽

Bubbling Fluidized Bed

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Biomass Gasification in a Bubbling Fluidized Bed Reactor

International Journal of Industrial Biotechnology and Biomaterials ◽

10.37628/ijibb.v6i2.594 ◽

2020 ◽

Vol 6 (2) ◽

Author(s):

D.V. Baratha Dodawatta ◽

U.D. Indula ◽

N.A.C.J.D. Senarathna ◽

D.G.C. Wickramasinghe ◽

M. Narayana

Keyword(s):

Fluidized Bed ◽

Fluidized Bed Reactor ◽

Biomass Gasification ◽

Bubbling Fluidized Bed

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Dynamic Modeling for Temperature Prediction in a Fluidized Bed Biomass Gasification Process

SSRN Electronic Journal ◽

10.2139/ssrn.3888677 ◽

2021 ◽

Author(s):

Ibtihaj Khurram Faridi ◽

Evangelos Tsotsas ◽

Wolfram Heineken ◽

Marcus Koegler ◽

Abdolreza Kharaghani

Keyword(s):

Fluidized Bed ◽

Dynamic Modeling ◽

Biomass Gasification ◽

Temperature Prediction ◽

Gasification Process

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Integrating LCA with Process Modeling for the Energetic and Environmental Assessment of a CHP Biomass Gasification Plant: A Case Study in Thessaly, Greece

Eng ◽

10.3390/eng1010002 ◽

2020 ◽

Vol 1 (1) ◽

pp. 2-30

Author(s):

Ioannis Voultsos ◽

Dimitrios Katsourinis ◽

Dimitrios Giannopoulos ◽

Maria Founti

Keyword(s):

Life Cycle Assessment ◽

Life Cycle ◽

Moisture Content ◽

Process Simulation ◽

Energy Savings ◽

Biomass Gasification ◽

Lower Efficiency ◽

Technical Parameters ◽

Gasification Process ◽

Gasification Plant

The energetic and environmental performance of a cogeneration biomass gasification plant, situated in Thessaly, Greece is evaluated via a methodology combining process simulation and Life Cycle Assessment (LCA). Initially, the gasification process of the most common agricultural residues found in the Thessaly region is simulated to establish the effect of technical parameters such as gasification temperature, equivalence ratio and raw biomass moisture content. It is shown that a maximum gasification efficiency of approximately 70% can be reached for all feedstock types. Lower efficiency values are associated with increased raw biomass moisture content. Next, the gasifier model is up-scaled, achieving the operation of a 1 MWel and 2.25 MWth cogeneration plant. The Life Cycle Assessment of the operation of the cogeneration unit is conducted using as input the performance data from the process simulation. Global Warming Potential and the Cumulative Demand of Non-Renewable Fossil Energy results suggest that the component which had the major share in both impact categories is the self-consumption of electricity of the plant. Finally, the key conclusion of the present study is the quantification of carbon dioxide mitigation and non-renewable energy savings by comparing the biomass cogeneration unit operation with conventional reference cases.

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Investigation of Ash-Related Issues During Combustion of Maize Straw and Wood Biomass Blends in Lab-Scale Bubbling Fluidized Bed Reactor

Journal of Energy Resources Technology ◽

10.1115/1.4044221 ◽

2019 ◽

Vol 142 (2) ◽

Cited By ~ 1

Author(s):

Krzysztof Głód ◽

Janusz Lasek ◽

Krzysztof Słowik ◽

Jarosław Zuwała ◽

Daniel Nabagło ◽

...

Keyword(s):

Fluidized Bed ◽

Air Velocity ◽

Interesting Phenomenon ◽

Simultaneous Application ◽

Agglomeration Process ◽

Bubbling Fluidized Bed ◽

Bed Agglomeration ◽

The Cost ◽

The Impact ◽

Combustion Of Solid Fuels

Abstract During the combustion of solid fuels, the undesired effects of ash transformation include bed agglomeration, slagging, and fouling processes. In particular, a problematic consequence of bed agglomeration is the defluidization process, resulting from the disappearance of gaseous bubbles that are created behind air distributors. Different solutions can be applied against the agglomeration process. One possible method is to apply some additives that influence the ash behavior, thus inhibiting the agglomeration process. This paper presents the results of investigations into ash-related issues in a laboratory-scale bubbling fluidized bed (BFB) reactor. In particular, the impact of additives (kaolin, halloysite, fly ash, and the residuals from wet desulfurization system (IMOS)) on bed agglomeration was investigated. It was found that the addition of these compounds increased the defluidization time from ∼109 min (without additive) to ∼285 min in the BFB (with the addition of 0.1 g/min of kaolin). The morphology of additive (kaolin and halloysite) transformation after their addition into the combustion chamber was discussed. Another interesting phenomenon is that residuals from the IMOS exhibited the ability to be an additive against the agglomeration process. The defluidization time can be also significantly increased by the simultaneous application of the additive and the control of fluidization air velocity. The procedure of periodical bed moving by impulse primary air feeding against defluidization (PADM) is suggested and discussed. The PADM procedure resulted in a 36% reduction of additive, thus reducing the cost of measures against ash-related issues.

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