Ash deposition mechanism of shoe manufacturing waste combustion in a full-scale CFB boiler

2021 ◽  
Vol 221 ◽  
pp. 106948
Author(s):  
Yueming Wang ◽  
Xinglei Qiu ◽  
Zhengang Zhou ◽  
Yuanqiang Duan ◽  
Lin Li ◽  
...  
Keyword(s):  
Full Scale ◽  
Ash Deposition ◽  
Deposition Mechanism ◽  
Cfb Boiler ◽  
Waste Combustion ◽  
Shoe Manufacturing ◽  
Shoe Manufacturing Waste

Particulate matter formation during shoe manufacturing waste combustion in a full-scale CFB boiler

2021 ◽  
Vol 221 ◽  
pp. 106914
Author(s):  
Zhengang Zhou ◽  
Xinglei Qiu ◽  
Yueming Wang ◽  
Yuanqiang Duan ◽  
Lin Li ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Full Scale ◽  
Cfb Boiler ◽  
Waste Combustion ◽  
Shoe Manufacturing ◽  
Shoe Manufacturing Waste ◽  
Particulate Matter Formation

scholarly journals Investigation of Ash Deposition Dynamic Process in an Industrial Biomass CFB Boiler Burning High-Alkali and Low-Chlorine Fuel

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1092
Author(s):  
Hengli Zhang ◽  
Chunjiang Yu ◽  
Zhongyang Luo ◽  
Yu’an Li
Keyword(s):  
Gas Flow ◽  
Circulating Fluidized Bed ◽  
Deposition Process ◽  
Biomass Combustion ◽  
Ash Deposition ◽  
Biomass Ash ◽  
Cfb Boiler ◽  
Third Stage ◽  
Ash Deposit ◽  
High Alkali

The circulating fluidized bed (CFB) boiler is a mainstream technology of biomass combustion generation in China. The high flue gas flow rate and relatively low combustion temperature of CFB make the deposition process different from that of a grate furnace. The dynamic deposition process of biomass ash needs further research, especially in industrial CFB boilers. In this study, a temperature-controlled ash deposit probe was used to sample the deposits in a 12 MW CFB boiler. Through the analysis of multiple deposit samples with different deposition times, the changes in micromorphology and chemical composition of the deposits in each deposition stage can be observed more distinctively. The initial deposits mainly consist of particles smaller than 2 μm, caused by thermophoretic deposition. The second stage is the condensation of alkali metal. Different from the condensation of KCl reported by most previous literatures, KOH is found in deposits in place of KCl. Then, it reacts with SO2, O2 and H2O to form K2SO4. In the third stage, the higher outer layer temperature of deposits reduces the condensation rate of KOH significantly. Meanwhile, the rougher surface of deposits allowed more calcium salts in fly ash to deposit through inertial impact. Thus, the elemental composition of deposits surface shows an overall trend of K decreasing and Ca increasing.

scholarly journals Investigation of ash deposition dynamic process in an industrial biomass CFB boiler burning high alkali and chlorine fuel

RSC Advances ◽  
2020 ◽  
Vol 10 (36) ◽  
pp. 21420-21426
Author(s):  
Hengli Zhang ◽  
Chunjiang Yu ◽  
Zhongyang Luo
Keyword(s):  
Dynamic Process ◽  
Deposition Process ◽  
Ash Deposition ◽  
Cfb Boiler ◽  
High Alkali

Analysis of multiple deposits with different deposition times, piecing together the whole deposition process in 50 MW biomass CFB boiler.

The A˚bo Akademi Database: Ash Behavior Measurements in Full-Scale Boilers

2005 ◽  
Author(s):  
Bengt-Johan Skrifvars ◽  
Patrik Yrjas ◽  
Tor Laure´n ◽  
Mikko Hupa ◽  
Martin Dittrich
Keyword(s):  
Fluidized Bed ◽  
Compositional Data ◽  
Full Scale ◽  
Back Side ◽  
Ash Deposition ◽  
Chemical Analyses ◽  
Boiler Load ◽  
Probe Surface ◽  
Poster Paper ◽  
Fluidized Bed Boilers

This poster paper presents an overview of the A˚bo Akademi full-scale boiler ash behavior measurement database. The database contains data from some 20 full-scale boiler measurement campaigns during which the ash behavior in the boiler has been monitored identically. The measurements have been done in 3 different bubbling fluidized bed boilers and 2 circulating fluidized bed boilers during 11 different campaigns. For comparison data from 2 pulverized fuel fired boilers as well as from 2 grate fired boilers have also been included. The data collection includes conventional analyses of the fuels or fuel mixes used during the measurements, ash deposition measurements performed with the air-cooled probe technique, chemical analyses of the collected deposits (front and back side separately, chemical analyses of the boiler fly ashes, and recordings of chosen relevant boiler operation parameters such as boiler load, air-distribution, and flue gas temperatures. The poster paper presents ash deposition data, so called Rate-of-build-up values (RBU, g/m2h) as a function of fuel mixes, probe surface temperatures and boiler type. The poster also presents compositional data of the collected deposits such as the chlorine content as a function of fuel mix and probe surface temperature.

Characterization of Ash Deposition and Heat Transfer Behavior of Coals during Combustion in a Pilot-Scale Facility and Full-Scale Utility

2009 ◽  
Vol 23 (5) ◽  
pp. 2570-2575 ◽  
Author(s):  
Sushil Gupta ◽  
Rajender Gupta ◽  
Gary Bryant ◽  
Terry Wall ◽  
Shinji Watanabe ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Pilot Scale ◽  
Full Scale ◽  
Ash Deposition ◽  
Heat Transfer Behavior ◽  
Transfer Behavior

Combustion and Deposition in Coal-Fired Turbines

1987 ◽  
Vol 109 (3) ◽  
pp. 319-324 ◽  
Author(s):  
S. G. Kimura ◽  
C. L. Spiro ◽  
C. C. Chen
Keyword(s):  
Coal Particle ◽  
Ash Content ◽  
Fuel Oil ◽  
Ash Deposition ◽  
Deposition Mechanism ◽  
Deposition Rates ◽  
Deposition Behavior ◽  
Residual Petroleum ◽  
Solids Content ◽  
Dry Combustion

Combustion and deposition behavior of coal in the form of highly beneficiated coal-water mixtures (CWM) has been investigated. The solids content of the CWM fuels was typically 50 percent, with a mean coal particle size of 4 μm and an ash content of 0.8 percent (dry). Combustion efficiencies in excess of 99.5 percent based on the carbon content of the collected ash were achieved in gas turbine-type can combustors with residence times of less than 20 ms with up to 25 percent (Btu basis) supplemental fuel oil assist. Ash deposition rates on a first-stage turbine nozzle sector were measured and were found to be much lower than would have been predicted from residual petroleum fuel experience because of differences in ash chemistry, and thus, deposition mechanism.

Characterization of lead-bearing phases in municipal waste combustor fly ash

1996 ◽  
Vol 54 ◽  
pp. 516-517
Author(s):  
L. L. Sutter ◽  
G. R. Dewey ◽  
J. F. Sandell
Keyword(s):  
Fly Ash ◽  
Bottom Ash ◽  
Municipal Waste ◽  
Primary Concern ◽  
Leaching Behavior ◽  
Waste Combustion ◽  
Lead And Cadmium ◽  
Lead Speciation ◽  
Accepted Practice

Municipal waste combustion typically involves both energy recovery as well as volume reduction of municipal solid waste prior to landfilling. However, due to environmental concerns, municipal waste combustion (MWC) has not been a widely accepted practice. A primary concern is the leaching behavior of MWC ash when it is stored in a landfill. The ash consists of a finely divided fly ash fraction (10% by volume) and a coarser bottom ash (90% by volume). Typically, MWC fly ash fails tests used to evaluate leaching behavior due to high amounts of soluble lead and cadmium species. The focus of this study was to identify specific lead bearing phases in MWC fly ash. Detailed information regarding lead speciation is necessary to completely understand the leaching behavior of MWC ash.

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