Investigation into scavenging of sodium and ash deposition characteristics during co-combustion of Zhundong lignite with an oil shale semi-coke of high aluminosilicate in a circulating fluidized bed
Investigation into scavenging of sodium and ash deposition characteristics during co-combustion of Zhundong lignite with an oil shale semi-coke of high aluminosilicate in a circulating fluidized bed
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准东褐煤与高铝硅酸油页岩半焦循环流化床混燃扫钠及灰沉积特性研究
DOI：
10.1016/j.fuel.2019.116099
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发表时间：
2019-12
期刊：
影响因子：
7.4
通讯作者：
Zhang Dongke
中科院分区：
文献类型：
--
作者：
Liu Zhuo;Li Jianbo;Zhu Mingming;Wang Quanhai;Lu Xiaofeng;Zhang Yuanyuan;Zhang Zhezi;Zhang Dongke
研究了准东褐煤与油页岩半焦在循环流化床中混烧时的除钠特性和灰沉积特性。准东褐煤（ZD）及其与10和20wt%的半焦（SC）的混合物在950 °C的CFB炉中燃烧。两个空气冷却的探针分别放置在炉腔（P1）和旋风分离器出口（P2）处，以模拟灰沉积。利用XRD、SEM-EDX、ICP-OES和激光粒度分析仪对底灰、飞灰和沉积在探头上的灰进行了采集和分析。结果表明，ZD粉煤灰由亚微米级颗粒和团聚体组成，其中Na主要为NaAlSi 3 O 8、Na 2SiO 3、Na 2Si 2 O 5和NaAlSiO 4。当添加高硅铝比的SC时，粉煤灰由亚微米颗粒组成，团聚体较少，其中含钠矿物也明显减少。在ZD燃烧过程中，底灰为富含SiO2、（Ca，Na）（Si，Al）4 O 8和CaSiO 3的粗颗粒，而添加SC后，底灰转变为SiO2、（Na，Ca）Al（Si，Al）3 O 8或NaAlSi 3 O 8，表明Na被SC捕获并保留在底灰中。P1上的存款在ZD燃烧时富含Na 2SO 4和CaSO 4，而在SC存在时变成富含Ca/Na铝硅酸盐的粗颗粒，显示烧结倾向降低。同样，P2沉积物是Ca/Na硫酸盐团聚体，但随着SC的加入，变成难熔的SiO2、Ca硫酸盐和铝硅酸盐。结果表明，添加SC后，燃烧ZD的循环流化床锅炉的积灰得到了缓解。
Scavenging of sodium and ash deposition characteristics during co-combustion of Zhundong lignite with an oil shale semi-coke in a circulating fluidized bed (CFB) were investigated. Zhundong lignite (ZD) and its blends with the semi-coke (SC) of 10 and 20 wt% were combusted in the CFB furnace at 950 °C. Two air-cooled probes were placed in the furnace chamber (P1) and at the cyclone outlet (P2), respectively, to simulate ash deposition. The bottom ash, fly ash and ash deposits on the probes were collected and analysed by using XRD, SEM-EDX, ICP-OES and laser particle analyser. Results show that the fly ash burning ZD was comprised of sub-micron particles and agglomerates enriched in CaSO4and SiO2, with Na being NaAlSi3O8, Na2SiO3, Na2Si2O5and NaAlSiO4. When SC of high Si/Al was added, the fly ash was comprised of sub-micron particles with less agglomerates, where Na-bearing minerals were also evidently reduced. Likewise, the bottom ash was coarse-grained particles rich in SiO2, (Ca,Na)(Si,Al)4O8and CaSiO3during ZD combustion but changed to SiO2, (Na,Ca)Al(Si,Al)3O8or NaAlSi3O8as SC was added, suggesting that Na was captured by SC and retained in the bottom ash. The deposit on P1was enriched in Na2SO4and CaSO4when ZD was burned but turned into coarse-grained particles rich in Ca/Na aluminosilicates while SC presented, showing a decreased sintering propensity. Likewise, the P2deposit was of Ca/Na sulphates agglomerates, but became refractory SiO2, Ca sulphate and aluminosilicates as SC added. Ash deposition in CFB burning ZD is consequently mitigated with SC addition.
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