Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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A Study on the Li5Fe5O8 Species Affecting the Microwave Heating Performance on the Ternary Li-Fe-Zn Material

3원계 금속산화물로 제조한 마이크로웨이브 발열소재상 Li5Fe5O8 종이 발열성능에 미치는 영향 연구

  • Jang, Young Hee (Department of Environmental Energy Engineering, Graduate School of Kyonggi University,) ;
  • Lee, Sang Moon (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Kim, Sung Su (Department of Environmental Energy Engineering, Kyonggi University)
  • 장영희 (경기대학교 일반대학원 환경에너지공학과) ;
  • 이상문 (경기대학교 환경에너지공학과) ;
  • 김성수 (경기대학교 환경에너지공학과)
  • Received : 2018.07.24
  • Accepted : 2018.08.27
  • Published : 2018.12.10
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Abstract

Dielectric heating materials were prepared through the thermal treatment for composites of Li and Zn type precursors that are major materials being responded to microwave under diversified conditions. The prepared heating material samples were analyzed by SEM and it was confirmed that $Li_5Fe_5O_8$ materials being formed on the surface was a major influencing factor for the heating performance. Heating materials improved the moisture removal in a sludge drying facility, for example, the moisture content of 25 v/v% sludge decreased to 15.22 v/v%. Accordingly, heating materials were confirmed to directly affect the performance and efficiency of the microwave drying process.

마이크로웨이브에 감응하는 주요물질인 Li와 Zn계 전구체를 다양한 조건별로 혼합 및 열처리하여 유전발열소재(dielectric heating materials)를 제조하였다. 제조된 발열소재의 표면 형태 등의 변화를 SEM 분석으로 확인하였으며 기공구조, 열처리 단계 그리고 표면에 형성되어 있는 $Li_5Fe_5O_8$ 물질이 발열성능에 주요한 영향인자임을 확인하였다. 또한 슬러지 건조 장치에 발열소재가 적용되었을 경우와 그렇지 않은 경우 25%의 함수율을 갖는 슬러지가 각각 6.34%, 15.22%로 건조되어 슬러지 수분 제거효율이 58.34% 상승하였음을 확인하였다. 이에 따라 발열소재가 마이크로웨이브 건조 공정의 성능 및 효율에 직접적인 영향을 미칠 수 있음을 확인하였다.

Keywords

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Figure 1. Schematic diagram of microwave oven setup for microwave heating of dielectric heating materials.

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Figure 2. Schematic diagram of sewage sludge drying test.

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Figure 3. Exothermic performance evaluations of test heating materials with different precursors (Li and Zn)(heating temperature: 1,400 ℃, gas: air, microwave condition: 500 W).

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Figure 4. Exothermic performance of test heating materials: (a): B-9, (b): B-14.

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Figure 5. SEM of B-9 with different conditions: (a): air, (b): N2, (c): Ar.

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Figure 6. XRD patterns of B-9 with different conditions: (a): air, (b): N2, (c): Ar.

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Figure 7. Exothermic performance of B-14 with different electrical power.

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Figure 8. Moisture contents of sludge with or without B-14 (heating temperature: 1,400 ℃, gas: N2, microwave experiment: 500 W, 1 min).

Table 1. Notation of Various Dielectric Heating Materials

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Table 2. Microwave heating test conditions

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Table 3. Mass Contents of w/w% of Sewage Sludge at Microwave Drying System

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Table 4. Moisture Contents of Sludge with or without B-14

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