Experimental Investigation of Ash Deposit Behavior during Co-Combustion of Bituminous Coal with Wood Pellets and Empty Fruit Bunches
Experimental Investigation of Ash Deposit Behavior during Co-Combustion of Bituminous Coal with Wood Pellets and Empty Fruit Bunches
复制标题
DOI：
10.3390/en12112087
复制
发表时间：
2019-05
期刊：
影响因子：
3.2
通讯作者：
T. Jeong;Lkhagvadorj Sh;Jongho Kim;B. Lee;C. Jeon
中科院分区：
文献类型：
--
作者：
T. Jeong;Lkhagvadorj Sh;Jongho Kim;B. Lee;C. Jeon
在韩国，油棕空果串 (EFB) 是毛棕榈油加工过程的副产品，是发电厂最有前途的潜在能源之一。然而，EFB在燃烧过程中的结渣和结垢特性尚未得到充分研究。因此，在这项研究中，我们使用热机械分析仪 (TMA) 和落管炉 (DTF) 研究了 EFB 与木颗粒 (WP) 的基本灰分行为。在几种生物质混合比下，用传统的预测指数研究了灰烬的熔化和灰烬颗粒的沉积。结果表明，随着WPs与EFBs比例的增加，由于生物质碱含量增加，熔化温度降低，造渣倾向增加。此外，使用TMA得出的针入度显示出更高的熔化峰，在该峰处发生快速熔化，并且熔化温度分布随着生物质混合的增加而减小。相反，DTF 结果显示在相同混合条件下灰分沉积的不同现象。接近 10% WP 和 15% EFB 的混合比例会导致灰烬沉积趋势逐渐降低，因为与单一煤灰相比，共燃物质的灰分含量较低。进一步添加生物质会增加灰分沉积，这是由于生物质中的灰分聚集所致。因此，本研究表明，10% WP 和 15% EFB 的混合比例为与所选烟煤共燃提供了最佳条件。此外，结果表明，由于EFB 的灰分含量高且同时发生结块，其结渣倾向高于WP。
In Korea, oil-palm empty fruit bunches (EFBs), which are byproducts of the crude palm-oil milling process, are among the most promising potential energy sources for power plants. However, the slagging and fouling characteristics of EFBs during combustion have not yet been fully studied. Accordingly, in this study, we investigated the fundamental ash behavior of EFBs in comparison to that of wood pellets (WPs) using a thermomechanical analyzer (TMA) and a drop-tube furnace (DTF). Ash melting and the deposition of ash particles were investigated with traditional prediction indices at several biomass blending ratios. The results demonstrated that, as the ratio of WPs to EFBs increases, the melting temperature decreases and the slagging propensity increases because of the increased biomass alkali content. Moreover, the penetration derived using the TMA shows a higher melting peak at which rapid melting occurs, and the melting temperature distribution is decreased with increased biomass blending. Conversely, the DTF results show different phenomena for ash deposition under the same blending conditions. Blend ratios approaching 10% WP and 15% EFB result in gradual decreases in ash deposition tendencies because of the lower ash contents of the co-combusted mass compared to that of the single coal ash. Further biomass addition increases ash deposition, which is attributable to ash agglomeration from the biomass. Thus, this study demonstrates that blending ratios of 10% WP and 15% EFB provide optimal conditions for co-combustion with the selected bituminous coal. In addition, it is shown that the slagging propensity of EFB is higher than that of WP owing to its ash content and simultaneous agglomeration.