Combustion Characteristics of Heavy Liquid Fuels in a Bubbling Fluidized Bed

2002 ◽  
Vol 124 (1) ◽  
pp. 40-46 ◽  
Author(s):  
E. J. Anthony ◽  
D. Y. Lu ◽  
J. Q. Zhang
Keyword(s):  
Heavy Metals ◽  
Fluidized Bed ◽  
Flue Gas ◽  
Liquid Fuel ◽  
Pilot Scale ◽  
Liquid Fuels ◽  
Feeding System ◽  
Fluidized Bed Combustion ◽  
Fuel Flexibility ◽  
Bubbling Fluidized Bed

Liquid fuels such as bitumen, tars, and pitches are byproducts of heavy oil upgrading processes, and are usually contaminated with high sulphur and sometimes heavy metals contents as well. Fluidized bed combustion (FBC) appears to be a promising technology for the combustion of such fuels due to its inherent fuel flexibility and low emissions characteristics. The combustion of three liquid fuels, i.e., no. 6 oil, bitumen and pitch was investigated in a pilot-scale bubbling FBC unit. An efficient liquid fuel feeding system was developed and a bubbling FBC was successfully used to combust all three liquid fuels. The proportion of fuel escaping in the form of unburnt hydrocarbons in the flue gas was less than 0.4 percent and combustion efficiencies higher than 98.5 percent were achieved. However, combustion of liquid fuels tended to occur in the freeboard and, therefore, good mixing of the fuels in the bed was critical in achieving satisfactory combustion performance.

scholarly journals Fluidized bed combustion with the use of Greek solid fuels

2003 ◽  
Vol 7 (2) ◽  
pp. 33-42
Author(s):  
Emmanuel Kakaras ◽  
Panagiotis Grammelis ◽  
George Skodras ◽  
Panagiotis Vourliotis
Keyword(s):  
Fluidized Bed ◽  
Brown Coal ◽  
Circulating Fluidized Bed ◽  
Pilot Scale ◽  
Thermal Capacity ◽  
Low Rank ◽  
Fluidized Bed Combustion ◽  
Bubbling Fluidized Bed ◽  
Combustion Technology ◽  
Combustion Tests

The paper is an overview of the results obtained up to date from the combustion and co-combustion activities with Greek brown coal in different installations, both in semi-industrial and laboratory scale. Combustion tests with Greek lignite were realized in three different Circulating Fluidized Bed Combustion (CFBC) facilities. Low rank lignite was burned in a pilot scale facility of approx. 100kW thermal capacity, located in Athens (NTUA) and a semi-industrial scale of 1.2 MW thermal capacity, located at RWE's power station Niederaussem in Germany. Co-combustion tests with Greek xylitic lignite and waste wood were carried out in the 1 MWth CFBC installation of AE&E, in Austria. Lab-scale co-combustion tests of Greek pre-dried lignite with biomass were accomplished in a bubbling fluidized bed in order to investigate ash melting problems. The obtained results of all aforementioned activities showed that fluidized bed is the appropriate combustion technology to efficiently exploit the low quality Greek brown coal either alone or in conjunction with biomass species.

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.

scholarly journals Three phase Eulerian-granular model applied on numerical simulation of non-conventional liquid fuels combustion in a bubbling fluidized bed

2016 ◽  
Vol 20 (suppl. 1) ◽  
pp. 133-149
Author(s):  
Stevan Nemoda ◽  
Milica Mladenovic ◽  
Milijana Paprika ◽  
Aleksandar Eric ◽  
Borislav Grubor
Keyword(s):  
Fluidized Bed ◽  
Fluid Dynamic ◽  
Numerical Procedure ◽  
Combustion Efficiency ◽  
Liquid Fuels ◽  
Chemical Components ◽  
Fluidized Bed Combustion ◽  
Bubbling Fluidized Bed ◽  
Energy Equations ◽  
Kinetic Gas Theory

The paper presents a two-dimensional CFD model of liquid fuel combustion in bubbling fluidized bed. The numerical procedure is based on the two-fluid Euler-Euler approach, where the velocity field of the gas and particles are modeled in analogy to the kinetic gas theory. The model is taking into account also the third - liquid phase, as well as its interaction with the solid and gas phase. The proposed numerical model comprise energy equations for all three phases, as well as the transport equations of chemical components with source terms originated from the component conversion. In the frame of the proposed model, user sub-models were developed for heterogenic fluidized bed combustion of liquid fuels, with or without water. The results of the calculation were compared with experiments on a pilot-facility (power up to 100 kW), combusting, among other fuels, oil. The temperature profiles along the combustion chamber were compared for the two basic cases: combustion with or without water. On the basis of numerical experiments, influence of the fluid-dynamic characteristics of the fluidized bed on the combustion efficiency was analyzed, as well as the influence of the fuel characteristics (reactivity, water content) on the intensive combustion zone.

scholarly journals Axial Concentration Profiles and NO Flue Gas in a Pilot-Scale Bubbling Fluidized Bed Coal Combustor

2004 ◽  
Vol 18 (6) ◽  
pp. 1615-1624 ◽  
Author(s):  
Luís A. C. Tarelho ◽  
Manuel A. A. Matos ◽  
Fernando J. M. A. Pereira
Keyword(s):  
Fluidized Bed ◽  
Flue Gas ◽  
Pilot Scale ◽  
Concentration Profiles ◽  
Bubbling Fluidized Bed ◽  
Axial Concentration

The fluidized bed combustion of a heavy liquid fuel

2003 ◽  
Vol 27 (4) ◽  
pp. 473-480 ◽  
Author(s):  
F.M Okasha ◽  
S.H El-Emam ◽  
H.K Mostafa
Keyword(s):  
Fluidized Bed ◽  
Liquid Fuel ◽  
Heavy Liquid ◽  
Fluidized Bed Combustion

Co-gasification of refused derived fuel and biomass in a pilot-scale bubbling fluidized bed reactor

2020 ◽  
Vol 206 ◽  
pp. 112476 ◽  
Author(s):  
D.T. Pio ◽  
L.A.C. Tarelho ◽  
A.M.A. Tavares ◽  
M.A.A. Matos ◽  
V. Silva
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Pilot Scale ◽  
Bubbling Fluidized Bed

scholarly journals Bubbling fluidized bed combustion of Syncrude coke

1987 ◽  
Author(s):  
E J Anthony ◽  
H A Becker ◽  
R K Code ◽  
R W McCleave ◽  
J R Stephenson
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Combustion ◽  
Bubbling Fluidized Bed

Fate of bromine and chlorine in bubbling fluidized bed combustion – Formation of alkali halide aerosols

Fuel ◽  
2014 ◽  
Vol 128 ◽  
pp. 390-395 ◽  
Author(s):  
Hao Wu ◽  
Tor Laurén ◽  
Patrik Yrjas ◽  
Pasi Vainikka ◽  
Mikko Hupa
Keyword(s):  
Fluidized Bed ◽  
Alkali Halide ◽  
Fluidized Bed Combustion ◽  
Bubbling Fluidized Bed
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