A New Agro/Forestry Residues Co-Firing Model in a Large Pulverized Coal Furnace: Technical and Economic Assessments

Weigang Xu, Yanqing Niu, Houzhang Tan, Denghui Wang, Wenzhi Du and Shien Hui
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Weigang Xu: Ministry of Education (MOE), Key Laboratory of Thermo-Fluid Science and Engineering, Department of Thermal Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Shaanxi 710049, China
Yanqing Niu: Ministry of Education (MOE), Key Laboratory of Thermo-Fluid Science and Engineering, Department of Thermal Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Shaanxi 710049, China
Houzhang Tan: Ministry of Education (MOE), Key Laboratory of Thermo-Fluid Science and Engineering, Department of Thermal Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Shaanxi 710049, China
Denghui Wang: Ministry of Education (MOE), Key Laboratory of Thermo-Fluid Science and Engineering, Department of Thermal Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Shaanxi 710049, China
Wenzhi Du: Ministry of Education (MOE), Key Laboratory of Thermo-Fluid Science and Engineering, Department of Thermal Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Shaanxi 710049, China
Shien Hui: Ministry of Education (MOE), Key Laboratory of Thermo-Fluid Science and Engineering, Department of Thermal Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Shaanxi 710049, China

Energies, 2013, vol. 6, issue 9, 1-17

Abstract: Based on the existing biomass co-firing technologies and the known innate drawbacks of dedicated biomass firing, including slagging, corrosion and the dependence on fuel, a new model of agro/forestry residue pellets/shreds and coal co-fired in a large Pulverized Coal (PC) furnace was proposed, and the corresponding technical and economic assessments were performed by co-firing testing in a 300 MW PC furnace and discounted cash flow technique. The developed model is more dependent on injection co-firing and combined with co-milling co-firing. Co-firing not only reduces CO 2 emission, but also does not significantly affect the fly ash use in cement industry, construction industry and agriculture. Moreover, economic assessments show that in comparison with dedicated firing in grate furnace, agro/forestry residues and coal co-firing in a large PC furnace is highly economic. Otherwise, when the co-firing ratio was below 5 wt%, the boiler co-firing efficiency was 0.05%–0.31% higher than that of dedicated PC combustion, and boiler efficiencies were about 0.2% higher with agro/forestry residues co-firing in the bottom and top burner systems than that in a middle burner system.

Keywords: co-firing; agro/forestry residues; mill; CO 2 /NO x /SO 2; boiler efficiency; fly ash; cement characteristics; economic assessment (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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