The Heat Release Ratio and Performance Test at a Small-Scale RDF-5 Bubbling Fluidized Bed Boiler

2009 ◽  
pp. 475-480
Author(s):  
Hou-Peng Wan ◽  
Chien-Song Chyang ◽  
Chyh-Sen Yang ◽  
Ching-I Juch ◽  
Kuo-Chao Lo ◽  
...  
Keyword(s):  
Heat Release ◽  
Fluidized Bed ◽  
Performance Test ◽  
Small Scale ◽  
Bubbling Fluidized Bed ◽  
Release Ratio ◽  
And Performance

scholarly journals DEVELOPMENT AND EVALUATION OF DRUM COFFEE ROASTING MACHINE FOR SMALL-SCALE ENTERPRISES

2020 ◽  
Vol 60 (1) ◽  
pp. 79-88
Author(s):  
Dadang Dayat Hidayat ◽  
Arie Sudaryanto ◽  
Yose Rizal Kurniawan ◽  
Ashri Indriati ◽  
Diang Sagita
Keyword(s):  
Development Time ◽  
Performance Test ◽  
Development Stage ◽  
Small Scale ◽  
Coffee Bean ◽  
Green Coffee ◽  
Roasting Machine ◽  
Average Crack ◽  
And Performance ◽  
Coffee Roasting

The design, manufacture and evaluation of a drum coffee roasting machine had been carried out. The aimed of the study was to develop a small-scale drum roaster to meet the demand of the small enterprises at design and function. The development stage consisted of sizing of the main components, creating technical drawings, determination of component materials, manufacture and performance test. The dimension of the roaster drum was 168.28 mm in diameter and 250 mm in length; the capacity of the roaster was 750 gram/ batch. Results of the test determined that the coffee roasting machine had worked well as expected. The preheating time was 15-22 minutes at a drum speed of 67.5 rpm. The initial loading temperature was 180°C. The test using arabica coffee bean reveals that the average crack time was 8.78 minutes, development time was 2.35 minutes, decreasing mass and increasing volume ranged from 19.80 – 20.30 % and 49.97 – 54.85 % respectively. The average crack time of Robusta coffee bean was 10 minutes; development time was 3 minutes, decreasing mass and increasing volume ranged from 10.87 – 14.90 % and 44.93 – 56.20 %, respectively. The required time to roast Arabica green coffee bean to the light-medium and medium-dark level was 11.3 and 12.38 minutes respectively, besides for Robusta green coffee beans was 13.00 and 14.00 minutes respectively.

A design methodology for small-scale bubbling fluidized-bed furnaces

1995 ◽  
Vol 19 (6) ◽  
pp. 535-553
Author(s):  
W. A. Macgregor ◽  
V. I. Ugursal ◽  
F. Hamdullahpur
Keyword(s):  
Fluidized Bed ◽  
Design Methodology ◽  
Small Scale ◽  
Bubbling Fluidized Bed

Fireside Deposit Formation in Biomass Fired FBC: A Comparison Between Tests Performed in Three Significantly Different Sized Combustors

2003 ◽  
Author(s):  
Bengt-Johan Skrifvars ◽  
Patrik Yrjas ◽  
Mikko Hupa ◽  
Martti Aho ◽  
Jaani Silvennoinen ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Flue Gas ◽  
Pilot Scale ◽  
Full Scale ◽  
Small Scale ◽  
Deposition Rates ◽  
Stable Conditions ◽  
Bubbling Fluidized Bed ◽  
Main Components ◽  
Fluidized Bed Boilers

This paper deals with the prediction of ash related problems in fluidized bed boilers during co-firing of various bio-fuels. A study was performed where the slagging and fouling behavior was monitored in three different sized bubbling fluidized bed combustors, a 20 kW semi-pilot reactor, a 2 MW pilot-scale device and a 105 MW full-scale boiler. The aim of the study was to learn about how well slagging and fouling in a small-scale device compares to a full-scale boiler and to see how well the slagging and fouling can be predicted with a small-scale device. Various types of Scandinavian bio-fuels as well as peat were used both separately and mixed. From all three devices ash and deposit samples were collected during as uniform and stable conditions as possible. The fuels used in the three devices during the test campaigns were carefully chosen so that they would be as similar as possible. Bed, furnace and flue gas temperatures were monitored as well as flue gas emissions. The fuels, ashes and deposits were analyzed on their main components and deposition rates were calculated based on the deposit measurements. These data were finally used for assessing the slagging and fouling propensity of the fired fuel. The paper compares and discusses the results from the three different size classes.

Scaled down Design of a Cold and Hot Flow Model Based on a Bubbling Fluidized Bed Pilot Plant Gasifier

2015 ◽  
Vol 786 ◽  
pp. 232-237 ◽  
Author(s):  
Iman Eslami Afrooz ◽  
Chandra Mohan Sinnathambi ◽  
Saravanan Karuppanan ◽  
Dennis Ling Chuan Ching
Keyword(s):  
Fluidized Bed ◽  
Pilot Plant ◽  
Scaling Laws ◽  
Flow Model ◽  
Operating Conditions ◽  
Critical Parameters ◽  
Small Scale ◽  
Empirical Equations ◽  
Cold Model ◽  
Bubbling Fluidized Bed

Bubbling fluidized bed (BFB) is a vital equipment in many applications in the energy, pharmaceuticals, and chemicals process industries due to its numerous advantages such as large heat capacity inside a bed, and rapid heat and mass transfer rate. In spite of numerous research activities, achieving high fluidization performances in BFB process is still a challenge of science. This research is being conducted to study the hydrodynamic regime of a BFB pilot plant gasifier. To this end, a lab-scale cold model was first designed based on the empirical equations and scaling laws. The scaling laws was used to scale down the Tenaga Nasional Berhad-PETRONAS (TNBR-PETRONAS) pilot plant gasifier into a small scale laboratory model. Moreover, the empirical equations were utilized to determine the critical parameters such as bed pressure drop, height of the bed, number of orifices of the distributor plate and the pitch size. Finally a lab-scale hot flow model will be designed based on the cold model geometric dimensions but under a real operating conditions as that of a pilot plant.

scholarly journals Empirical Design, Construction, and Experimental Test of a Small-Scale Bubbling Fluidized Bed Reactor

2021 ◽  
Vol 13 (3) ◽  
pp. 1061 ◽  
Author(s):  
Carlos Vargas-Salgado ◽  
Elías Hurtado-Pérez ◽  
David Alfonso-Solar ◽  
Anders Malmquist
Keyword(s):  
Fluidized Bed ◽  
Distribution System ◽  
Experimental Tests ◽  
Fluidized Bed Reactor ◽  
Air Distribution ◽  
Small Scale ◽  
Trial And Error ◽  
Integrated Methodology ◽  
Bubbling Fluidized Bed ◽  
Design Construction

The methods currently used for designing a fluidized bed reactor in gasification plants do not meet an integrated methodology that optimizes all the different parameters for its sizing and operational regime. In the case of small-scale (several tens of kWs biomass gasifiers), this design is especially complex, and, for this reason, they have usually been built in a very heuristic trial and error way. In this paper, an integrated methodology tailoring all the different parameters for the design and sizing of a small-scale fluidized bed gasification plants is presented. Using this methodology, a 40 kWth biomass gasification reactor was designed, including the air distribution system. Based on this design, with several simplified assumptions, a reactor was built and commissioned. Results from the experimental tests using this gasifier are also presented in this paper. As a result, it can be said the prototype works properly, and it produces syngas able to produce thermal energy or even electricity.

scholarly journals Experimental Evaluation of Napier Grass Gasification in an Autothermal Bubbling Fluidized Bed Reactor

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1517 ◽  
Author(s):  
Ramin Khezri ◽  
Wan Azlina Wan Ab Karim Ghani ◽  
Dayang Radiah Awang Biak ◽  
Robiah Yunus ◽  
Kiman Silas
Keyword(s):  
Fluidized Bed ◽  
High Performance ◽  
Maximum Yield ◽  
Substantial Effect ◽  
Napier Grass ◽  
Small Scale ◽  
Fluidized Bed Reactors ◽  
Direct Combustion ◽  
Bubbling Fluidized Bed ◽  
Fluidized Bed Gasifier

Air gasification of Napier grass (NG) was studied with the target of producing combustible synthesis gas to be used in direct combustion for power generation. A small-scale autothermal bubbling fluidized bed gasifier was used to investigate the effect of reactor temperature, equivalence ratio (ER), and static bed height (SBH) on gasification performance and combustibility of the producer gas. The main generated species in syngas were identified through gas chromatography (GC) analysis. Minimum fluidization conditions were determined at different levels of SBH. Experiments carried out with two intentions of first, to achieve the highest composition of combustible species to ensure the maximum Lower Heating Value (LHV) of syngas and second, to obtain a high performance process with maximum yield of syngas and minimum residues. The results showed that the temperature and ER have significant effects on syngas yield and composition. SBH was found have a substantial effect on the production of H2 and CO. The results from this study was compared to other gasification studies from literature which have evaluated biomass gasification in bubbling fluidized bed reactors with different scales but almost similar method of experimentation. The purpose of verification was to demonstrate the effect of different reactor scales and heating characteristics on the results.

Technical Feasibility to Utilize Wasted Empty Fruit Bunch from Small Scale Farms for Simultaneous Production of Biochar and Electricity

2020 ◽  
Vol 3 (3) ◽  
pp. 88-98
Author(s):  
Dwi Setiawan ◽  
Johanis Rumengan Pangala ◽  
Abdul Baits Dehana Padma Swastika ◽  
Armansyah Halomoan Tambunan
Keyword(s):  
Electricity Generation ◽  
Energy Use ◽  
Performance Test ◽  
Small Scale ◽  
Airflow Rate ◽  
Empty Fruit Bunch ◽  
Technical Feasibility ◽  
Excess Heat ◽  
Simultaneous Production ◽  
And Performance

Biochar production by pyrolysis stove and utilization of the excess heat to generate electricity, simultaneously, could improve the performance of the whole system, and give a significant solution to both energy and environmental problems. This is especially if implemented as a stand-alone facility and applied in a remote area. The purpose of this study is to evaluate technical feasibility and strategy in using pyrolysis stoves to produce biochar and generate electricity by ORC, simultaneously. This study combines various data obtained previously, which consists of pyrolysis stove design and performance test for simultaneous biochar production and thermal energy use, and ORC experiments for electricity generation. Those data then was used to analyze the technical feasibility of the simultaneous production of biochar and electricity generation using the excess heat from the pyrolysis stove. The integration of the pyrolysis stove with the ORC was conducted in a simulative study. The results showed that biochar produced using the pyrolysis stove has characteristics that are very supportive for use as a soil enhancer. Excess heat from the pyrolysis stove during the production of biochar can be used to fuel the ORC system to generate electricity. The optimum biochar yield and thermal efficiency of the ORC were found to be optimum at the stove's airflow rate of 0.034-0.035 kg/s. Accordingly, a combination of biochar production and electricity generation using the ORC system is considered to be technologically feasible to meet the sustainability requirement.

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