Abstract
This study is conducted for understanding the fluidization behavior in a CFB combustor for low ranked coals. A lab-scale cold CFB test rig was built at the NFCIET Multan for understanding the fluidization behaviour. Influence of fluidizing air on the fluidization behavior was observed. It was found that voidage along the riser height is affected by riser geometry. The combustion behavior of low grade coals from Thar coal was also explored in a CFB Combustor. The influence of the fluidizing air on the combustion erformance was examined and their effect on emissions was established. The temperature in the riser of the CFB rose quickly to around 900°C. This rise in temperature has caused an increase in the amount of exhaust gasses which has their influence on the suspension density. From this study, a firsthand experience of combustion behavior of low grade Pakistani coals was documented.
Highlights
Fluid-catalytic cracking (FCC) are industrial processes that are continuously improving over the past two decades in the circulating fluidized bed (CFB) combustors
Thar, is an asset of having around 175 billion tones of coal is the biggest coalfield of Pakistan and Thar coal ranges from lignite-B to sub-bituminous-A having low sulfur and high moisture content
The pressure drop at various heights in the riser section is shown in Figure 8.In circulating fluidized beds, to study the axial voidage distribution is an important factor because pressure drop is determine along the CFB and within the riser is closely related to the mean solid time residence
Summary
Fluid-catalytic cracking (FCC) are industrial processes that are continuously improving over the past two decades in the circulating fluidized bed (CFB) combustors. Some important areas of performance have limited information and this limited knowledge hinder the operation and/or design of industrial CFB reactors [5,6]. Engin et al(2018) [13] have reported that the most challenging problem in CFB combustion is SO2 emissions. The use of lignite as energy sources and low-ranked coals increased recently. Wang et al (2017) [18] investigated experimental and computational fluid dynamics (CFD) analysis of low grade coal combustion. Margarita et al (2018) [19] experimentally found that the major gas emissions from the industrial combustion of coal. Et al (2018) [20] studied hydrolysis of lignin and low rank coal in a drop-tube fixed bed reactor. As the fluidization velocity of the bubbling fluidized bed (BFB) increases, the foaming http://dx.doi.org/10.24949%2Fnjes.v11i1.436
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