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<p>Burning of rice straw in open fields is the major pollution source in Vietnam. Producing fuel pellets from rice straw is challenging due to technical issues like low lignin, long fibers, high moisture, and low ash melting temperature. This study aims to assess the effects of operating conditions and additives on the fuel properties and emissions of rice straw, with the goal of improving its biofuel performance. The impacts of additives, moisture, particle size, and pelletizing pressure on durability, density, ash content, elemental composition, and heating value of rice straw pellets were examined. Rice straw pellets were produced at pelletizing pressure ranging from 100 to 287&#xa0;MPa and moisture ranging from 12 to 18%, resulting in durability ranging from 67 to 96% and density ranging from 980 to 1,350&#xa0;kg/m<sup>3</sup>. Without additives, the coarsely grinding feedstock produced pellets with the highest density of 1,250&#xa0;kg/m<sup>3</sup> and the highest durability of 91%. The black liquor significantly enhanced the density and durability of rice straw pellets. The density and durability of pellets mixed with the black liquor additive were over 1,350&#xa0;kg/m<sup>3</sup> and 96%, respectively. Kaolin and calcium oxide additives reduced ash content by 4.4% and 6.7%, respectively. The calcium oxide additive increased S and Cl content in the ash of rice straw pellets, thereby potentially reducing SO<sub>x</sub> and HCl emissions during pellet combustion. Improving the quality of rice straw pellets can help utilize this renewable energy source to replace fossil fuels, reduce air pollution, and decrease greenhouse gas emissions in Vietnam.</p>

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Effects of pelletizing conditions and additives on properties of rice straw fuel pellets and ash characteristics

  • 期刊论文

  • 发表日期：

    2025年2月21日

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  • Truong Xuan Do,
  • Kien Trung Tran,
  • Anh Tuan Vu,
  • Tho Dinh Son Van,
  • Son Thanh Le,
  • Phuc Quang Nguyen

摘要

Burning of rice straw in open fields is the major pollution source in Vietnam. Producing fuel pellets from rice straw is challenging due to technical issues like low lignin, long fibers, high moisture, and low ash melting temperature. This study aims to assess the effects of operating conditions and additives on the fuel properties and emissions of rice straw, with the goal of improving its biofuel performance. The impacts of additives, moisture, particle size, and pelletizing pressure on durability, density, ash content, elemental composition, and heating value of rice straw pellets were examined. Rice straw pellets were produced at pelletizing pressure ranging from 100 to 287 MPa and moisture ranging from 12 to 18%, resulting in durability ranging from 67 to 96% and density ranging from 980 to 1,350 kg/m3. Without additives, the coarsely grinding feedstock produced pellets with the highest density of 1,250 kg/m3 and the highest durability of 91%. The black liquor significantly enhanced the density and durability of rice straw pellets. The density and durability of pellets mixed with the black liquor additive were over 1,350 kg/m3 and 96%, respectively. Kaolin and calcium oxide additives reduced ash content by 4.4% and 6.7%, respectively. The calcium oxide additive increased S and Cl content in the ash of rice straw pellets, thereby potentially reducing SOx and HCl emissions during pellet combustion. Improving the quality of rice straw pellets can help utilize this renewable energy source to replace fossil fuels, reduce air pollution, and decrease greenhouse gas emissions in Vietnam.