Study on impact of coal particle ash content on bottom ash formation behavior in fluidized bed combustion

2014 ◽  
Author(s):  
YanPeng Liu ◽  
BeiJing Zhong ◽  
ShaoHua Li
Keyword(s):  
Fluidized Bed ◽  
Coal Particle ◽  
Bottom Ash ◽  
Ash Content ◽  
Fluidized Bed Combustion ◽  
Formation Behavior ◽  
Ash Formation

Partitioning of Trace Elements During Fluidized Bed Combustion of High Ash Content Lignite

2005 ◽  
Author(s):  
Nevin Selc¸uk ◽  
Yusuf Gogebakan ◽  
Zuhal Gogebakan
Keyword(s):  
Trace Elements ◽  
Fly Ash ◽  
Fluidized Bed ◽  
Inductively Coupled Plasma ◽  
Bottom Ash ◽  
Ash Content ◽  
Fluidized Bed Combustion ◽  
Test Rig ◽  
Minor Elements ◽  
Element Partitioning

The behavior of 20 trace elements (As, B, Ba, Cd, Co, Cr, Cu, Hg, Li, Mn, Mo, Ni, P, Pb, Sb, Se, Sn, Tl, V, Zn) and 8 major and minor elements (Al, Ca, Fe, K, Mg, Na, Si, Ti) during the combustion of high ash content lignite with and without limestone addition have been investigated in the 0.3 MWt Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) Test Rig. Experiments were performed without fines recycle. Inert bed material utilized in the experiments was bed ash obtained previously from the combustion of the same lignite without limestone addition in the same test rig. Concentrations of trace elements in coal, limestone, bottom ash, cyclone ash and filter ash were determined by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). Measurements show that the distribution of major and minor elements follows the ash split between the bottom ash and fly ash and that the major proportion of most of the trace elements (As, Ba, Cr, Hg, Li, Mo, Ni, Sn, V, Zn) are recovered in fly ash. Comparisons between the trace element partitioning of the runs with and without limestone addition reveal that addition of limestone shifts the partitioning of Ba, Cr, Hg, Mo, Ni, Sn, V, Zn from bottom ash to fly ash.

scholarly journals Enhanced reactivity of geopolymers produced from fluidized bed combustion bottom ash

2020 ◽  
Vol 34 ◽  
pp. 72-77
Author(s):  
Tobi Stephen Osholana ◽  
Mbuso Kingdom Dludlu ◽  
Bilainu Oboirien ◽  
Rotimi Sadiku
Keyword(s):  
Fluidized Bed ◽  
Bottom Ash ◽  
Fluidized Bed Combustion

Fluidized bed combustion bottom ash: A better and alternative geo-material resource for construction

2018 ◽  
Vol 36 (4) ◽  
pp. 351-360 ◽  
Author(s):  
AK Mandal ◽  
Bala Ramudu Paramkusam ◽  
OP Sinha
Keyword(s):  
Fluidized Bed ◽  
Coal Combustion ◽  
Construction Material ◽  
Combustion Process ◽  
Bottom Ash ◽  
Base Material ◽  
Filter Material ◽  
Fluidized Bed Combustion ◽  
River Sand ◽  
Pulverized Combustion

Though the majority of research on fly ash has proved its worth as a construction material, the utility of bottom ash is yet questionable due to its generation during the pulverized combustion process. The bottom ash produced during the fluidized bed combustion (FBC) process is attracting more attention due to the novelty of coal combustion technology. But, to establish its suitability as construction material, it is necessary to characterize it thoroughly with respect to the geotechnical as well as mineralogical points of view. For fulfilling these objectives, the present study mainly aims at characterizing the FBC bottom ash and its comparison with pulverized coal combustion (PCC) bottom ash, collected from the same origin of coal. Suitability of FBC bottom ash as a dike filter material in contrast to PCC bottom ash in replacing traditional filter material such as sand was also studied. The suitability criteria for utilization of both bottom ash and river sand as filter material on pond ash as a base material were evaluated, and both river sand and FBC bottom ash were found to be satisfactory. The study shows that FBC bottom ash is a better geo-material than PCC bottom ash, and it could be highly recommended as an alternative suitable filter material for constructing ash dikes in place of conventional sand.

Effect of Fuel Properties on the Bottom Ash Generation Rate by a Laboratory Fluidized Bed Combustor

2006 ◽  
Vol 129 (2) ◽  
pp. 144-151 ◽  
Author(s):  
Peter L. Rozelle ◽  
Sarma V. Pisupati ◽  
Alan W. Scaroni
Keyword(s):  
Particle Size ◽  
Specific Gravity ◽  
Fluidized Bed ◽  
Size Range ◽  
Bottom Ash ◽  
Test System ◽  
Ash Content ◽  
Fuel Properties ◽  
Inventory Level ◽  
Ash Removal

The fluidized bed combustion (FBC) process, used in power generation, can handle a variety of fuels. However, the range of fuels that can be accommodated by an FBC boiler system is affected by the ability of the fuel, sorbent, and ash-handling equipment to move the required solids through the boiler. Of specific interest is the bottom ash handling equipment, which must have sufficient capacity to remove ash from the system in order to maintain a constant bed inventory level, and must have sufficient capability to cool the ash well below the bed temperature. Quantification of a fuel’s bottom ash removal requirements can be useful for plant design. The effect of fuel properties, on the rate of bottom ash production in a laboratory FBC test system was examined. The work used coal products ranging in ash content from 20to40+wt.%. The system’s classification of solids by particle size into flyash and bottom ash was characterized using a partition curve. Fuel sizing was compared to the partition curve, and fuels were fractionated by particle size. Fuel fractions in the size range characteristic of bottom ash were further analyzed for distributions of ash content with respect to specific gravity, using float sink tests. The fuel fractions were then ashed in a fixed bed. In each case, the highest ash content fraction produced ash with the coarsest size consist (characteristic of bottom ash). The lower ash content fractions were found to produce ash in the size range characteristic of flyash, suggesting that the high ash content fractions were largely responsible for the production of bottom ash. The contributions of the specific gravity fractions to the composite ash in the fuels were quantified. The fuels were fired in the laboratory test system. Fuels with higher amounts of high specific gravity particles, in the size ranges characteristic of bottom ash, were found to produce more bottom ash, indicating the potential utility of float sink methods in the prediction of bottom ash removal requirements.

Assessment of Sorbent Reactivation by Water Hydration for Fluidized Bed Combustion Application

2003 ◽  
Author(s):  
Fabio Montagnaro ◽  
Piero Salatino ◽  
Fabrizio Scala ◽  
Yinghai Wu ◽  
Edward Anthony ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Liquid Water ◽  
Operating Cost ◽  
Bottom Ash ◽  
Full Scale ◽  
Fluidized Bed Combustion ◽  
Research Activities ◽  
Combination Of Methods ◽  
Influence Of Hydration

Disposal of FBC solid residues currently represents one of the major issues in FBC design and operation, and contributes significantly to FBC operating cost. This issue has triggered research activities on the enhancement of sorbent utilization for in-situ sulfur uptake. The present study addresses the effectiveness of the reactivation by liquid water hydration of FB spent sorbents. Two materials are considered in the study, namely bottom ash from the operation of a full-scale utility FB boiler and the raw commercial limestone used in the same boiler. Hydration-reactivation tests were carried out at temperatures of 40°C and 80°C and for curing times ranging from 15min to 2d, depending on the sample. The influence of hydration conditions on the enhancement of sulfur utilization has been assessed. A combination of methods has been used to characterize the properties of liquid water-hydrated materials.

scholarly journals PROKNOW-C: DA SELEÇÃO DE UM PORTFÓLIO DE ARTIGOS A ANÁLISE SISTÊMICA SOBRE BLOCOS DE TERRA COMPRIMIDA

2019 ◽  
Vol 17 (3) ◽  
Author(s):  
Sâmara França ◽  
Mariana Rezende Schuab ◽  
Kastelli Pacheco Sperandio ◽  
Rogério Cabral de Azevedo ◽  
Maria Cristina Ramos de Carvalho ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Bottom Ash ◽  
Fluidized Bed Combustion ◽  
Circulating Fluidized Bed Combustion

Blocos de terra compactada são elementos de alvenaria feitos a partir de terra estabilizada e adensada. Estes materiais se destacam no quesito sustentabilidade por dispensarem a fase de queima em sua produção. A estabilização química dos blocos pode ser realizada através da ativação alcalina que consiste na obtenção de ligantes a partir de materiais aluminossilicatos em uma solução fortemente alcalina. A ativação alcalina também é vista como ambientalmente correta devido a sua baixa emissão de gases do efeito estufa.  Entre os materiais precursores da ativação alcalina estão as cinzas volantes devido a sua composição química. Diante desse contexto, o objetivo deste trabalho é montar um portfólio de artigos científicos sobre blocos de terra compactado com adição de cinzas orgânicas e ativação alcalina, fazer análise bibliométrica e sistêmica dos artigos. O portfólio bibliográfico resultante é composto por 4 artigos relevantes e alinhados com o tema. Dentro da análise bibliométrica pode-se destacar o artigo “Feasibility o fmanufacturing geopolymer bricks using circulating fluidized bed combustion bottom ash” como mais relevante. Em relação a análise sistêmica elencou-se 5 lentes para a discussão dos artigos e a partir disso pode-se observar oportunidades para futuras pesquisas.

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