Advances in New and Renewable Energy >
Experimental Study on Slagging Characteristics of Typical Agricultural Biomass in South China
Received date: 2014-05-19
Revised date: 2014-06-09
Online published: 2014-08-30
The combustion slagging characteristics experiments were carried out for bagasse, sugarcane leaf and rice straw, the typical agricultural biomass in Guangdong province. GB/T212-2001 and ASTM E1755 were adopted as standards to the ashing experiments respectively. Both pyramid method and one-step experimental method were carried out to measure the ash melting charateristics of the biomass. Ashing experiments results confirmed that the ASTM standard with low ashing temperature is more suitable for the biomass materials with high inorganic salt contents. The alkali metal oxide content in rice straw reached more than 20%, which is the main factor to cause ash melting and slagging. In the pyramid method, part of alkali metal and chlorine were transformed and precipitated in advance, so the test result was far higher than the actual combustion melting temperature. Compared with pyramid method, one-step method was more intuitive and instructional. And by one-step experimental, the critical slagging temperature of rice straw was at 700oC ~ 750oC, bagasse at 850oC ~ 900oC, sugarcane leaves at 900oC ~ 950oC. Adding CaO and Al2O3 into the biomass material had a certain resistance effect on the slagging function. CaO can react with SiO2 (s) to produce the high melting point solid Ca3Si2O7 (s) and MgOCa3O3Si2O4 (s), so able to consume the SiO2 (s) around the biomass material and inhibiting the co-fusion in low temperature. While Al2O3 can generate high melting point solid KAlSiO4 and KAlSi2O6, slowing down the eutectic phenomenon in low temperature.
FANG Jiang-tao , LIAO Yan-fen , HUANG Ze-hao , MA Xiao-qian , HUANG Jia-song . Experimental Study on Slagging Characteristics of Typical Agricultural Biomass in South China[J]. Advances in New and Renewable Energy, 2014 , 2(4) : 275 -281 . DOI: 10.3969/j.issn.2095-560X.2014.04.006
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