Ash deposition behavior in co-combusting high-alkali coal and bituminous coal in a circulating fluidized bed

2019 ◽  
Vol 149 ◽  
pp. 520-527 ◽  
Author(s):  
Yanquan Liu ◽  
Leming Cheng ◽  
Jieqiang Ji ◽  
Weiguo Zhang
Keyword(s):  
Fluidized Bed ◽  
Bituminous Coal ◽  
Circulating Fluidized Bed ◽  
Ash Deposition ◽  
Deposition Behavior ◽  
High Alkali

scholarly journals Ash deposition behavior of a high-alkali coal in circulating fluidized bed combustion at different bed temperatures and the effect of kaolin

RSC Advances ◽  
2018 ◽  
Vol 8 (59) ◽  
pp. 33817-33827 ◽  
Author(s):  
Yanquan Liu ◽  
Leming Cheng ◽  
Jieqiang Ji ◽  
Qinhui Wang ◽  
Mengxiang Fang
Keyword(s):  
Fluidized Bed ◽  
Combustion Temperature ◽  
Circulating Fluidized Bed ◽  
Ash Deposition ◽  
Fluidized Bed Combustion ◽  
Deposition Behavior ◽  
Zhundong Coal ◽  
High Alkali ◽  
Circulating Fluidized Bed Combustion

This work reports the influence of combustion temperature on the ash deposition of Zhundong coal in a CFB, and evaluates the effect of kaolin.

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.

Fly Ash Deposition Onto the Convective Heat Exchangers During Combustion of Willow in a Circulating Fluidized Bed Boiler

2005 ◽  
pp. 541-553 ◽  
Author(s):  
Terttaliisa Lind ◽  
Esko I. Kauppinen ◽  
George Sfiris ◽  
Kristina Nilsson ◽  
Willy Maenhaut
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Convective Heat ◽  
Heat Exchangers ◽  
Circulating Fluidized Bed ◽  
Ash Deposition ◽  
Circulating Fluidized Bed Boiler ◽  
Fly Ash Deposition

Dependence of bituminous coal gasification on pressure in a turbulent circulating fluidized bed

2011 ◽  
Vol 7 (6) ◽  
pp. 822-827 ◽  
Author(s):  
Feng Duan ◽  
Lihui Zhang ◽  
Yaji Huang
Keyword(s):  
Fluidized Bed ◽  
Bituminous Coal ◽  
Coal Gasification ◽  
Circulating Fluidized Bed

Ash Deposition Behavior of Upgraded Brown Coal and Bituminous Coal

2010 ◽  
Vol 24 (8) ◽  
pp. 4138-4143 ◽  
Author(s):  
Katsuya Akiyama ◽  
Haeyang Pak ◽  
Toshiya Tada ◽  
Yasuaki Ueki ◽  
Ryo Yoshiie ◽  
...  
Keyword(s):  
Brown Coal ◽  
Bituminous Coal ◽  
Ash Deposition ◽  
Deposition Behavior

CO2-O2 gasification of a bituminous coal in circulating fluidized bed

Fuel ◽  
2017 ◽  
Vol 200 ◽  
pp. 81-88 ◽  
Author(s):  
Chen Liang ◽  
Haixia Zhang ◽  
Zhiping Zhu ◽  
Yongjie Na ◽  
Qinggang Lu
Keyword(s):  
Fluidized Bed ◽  
Bituminous Coal ◽  
Circulating Fluidized Bed

Experimental study on NOx emissions of pulverized bituminous coal combustion preheated by a circulating fluidized bed

2019 ◽  
Vol 92 (2) ◽  
pp. 247-256 ◽  
Author(s):  
Shujun Zhu ◽  
Qinggang Lyu ◽  
Jianguo Zhu ◽  
Chen Liang
Keyword(s):  
Experimental Study ◽  
Fluidized Bed ◽  
Coal Combustion ◽  
Bituminous Coal ◽  
Circulating Fluidized Bed ◽  
Nox Emissions
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