Citation: WANG Qian, HAN Kui-hua, LI Hui, QI Jian-hui, LU Chun-mei. Influence of ammonium dihydrogen phosphates additive on potassium fixation capacity and ash fusibility for rice straw combustion in an O₂/CO₂ atmosphere[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(8): 955-960. shu

Influence of ammonium dihydrogen phosphates additive on potassium fixation capacity and ash fusibility for rice straw combustion in an O₂/CO₂ atmosphere

1.
National Engineering Laboratory for Coal-Burning Pollutants Emission Reduction, School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Corresponding author: HAN Kui-hua,
Received Date: 19 March 2015
Available Online: 1 July 2015
Fund Project: 国家自然科学基金(51206096) (51206096)济南高校自主创新基金(201401275)。 (201401275)

Particle agglomeration, fouling on the heating surface and other issues are closely related to the alkali metals during biomass thermo-chemical conversion. The potassium fixation ability and ash fusing characteristics in the combustion of rice straw (RS) added with ammonium dihydrogen phosphate (NH₄H₂PO₄) were studied in a 21%O₂/79%CO₂ atmosphere. The reaction residue from the experiment in a drop tube furnace was analyzed with inductively coupled plasma atomic emission spectrometer (ICP-AES), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The potassium retention ratio of co-combustion of RS and NH₄H₂PO₄ is higher than that of RS alone, especially at 900℃, and the retention ratio increases from 14.65% to 68.79%. The reaction between NH₄H₂PO₄ and alkali metals in rice straw leads to the formation of KPO₃ at 700 ℃ and K₂CaP₂O₇ at 900℃, which is a high melting point compound. SEM analysis on residue indicates the agglomeration is inhibited, and the ash fusion temperature of RS is increased by adding NH₄H₂PO₄. These results can be helpful to the research and development of high-alkali biomass clean utilization process.
- biomass,
- O₂/CO₂ combustion,
- ammonium dihydrogen phosphate,
- alkali metals
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Influence of ammonium dihydrogen phosphates additive on potassium fixation capacity and ash fusibility for rice straw combustion in an O2/CO2 atmosphere

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通讯作者: 陈斌, bchen63@163.com

Influence of ammonium dihydrogen phosphates additive on potassium fixation capacity and ash fusibility for rice straw combustion in an O₂/CO₂ atmosphere