Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A Study on Composition and Utilization of Waste Heat Recovery System Assuming Aerobic Liquid-composting Fermentation heat

호기성 액비화 발효열을 가정한 폐열회수시스템 구성 및 활용 연구

  • Lim, Ryugap (Division of Energy & Environmental, Department of Agricultural Engineering, NlAS) ;
  • Jang, Jae Kyung (Division of Energy & Environmental, Department of Agricultural Engineering, NlAS) ;
  • Kang, Taegyung (Division of Energy & Environmental, Department of Agricultural Engineering, NlAS) ;
  • Son, Jinkwan (Division of Energy & Environmental, Department of Agricultural Engineering, NlAS) ;
  • Lee, Donggwan (SK hynix SHE R&D)
  • 임류갑 (국립농업과학원 농업공학부 에너지환경공학과) ;
  • 장재경 (국립농업과학원 농업공학부 에너지환경공학과) ;
  • 강태경 (국립농업과학원 농업공학부 에너지환경공학과) ;
  • 손진관 (국립농업과학원 농업공학부 에너지환경공학과) ;
  • 이동관 (SK 하이닉스 선행환경보건팀)
  • Received : 2021.01.07
  • Accepted : 2021.04.02
  • Published : 2021.04.30
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Abstract

In this study, a waste heat recovery system was devised and the performances of components incorporated to recover the heat generated during the processing of aerobic liquid-composting in a livestock manure treatment facility were analyzed. In addition, the availability of recovered heat was confirmed. The heat generated by liquid fermentation in the livestock manure treatment facility was also checked. Experimental temperatures were set at 35, 40, and 45 ℃ based on considerations of the uniformity of aerobic liquid-composting fermentation tank temperature and its operating range (34.5 ~ 43.9 ℃). Recovered heat energies from the combined heat exchanger, which consisted of PE and STS pipes, were 53.5, 65.6, 74.4 MJ/h, The heat pump of capacity 5 RT was heated at 95.6, 96.1, 98.9 MJ/h and the heating COPs of the pump were 4.53, 4.62, and 4.65, respectively. The maximum hot water production capacity of the heat exchanger assuming a fermentation tank temperature of 45 ℃ confirmed an energy supply of 56 360 kcal/day. The heating capacity of the FCU linked to the heat storage tank was 20.8 MJ/h, and the energy utilization efficiency was 96.1%. When livestock manure was dried using the FCU, it was confirmed that the initial function rate was reduced by 50.5 to 45.8 % after drying.

본 연구에서는 가축분뇨 처리시설의 호기성 액비화 과정에서 발생하는 열을 회수하기 위한 폐열회수 시스템을 고안하여 시스템을 구성하는 요소 장치의 성능을 분석하였다. 또한, 회수된 열의 활용 가능성을 확인하였다. 실험 설정을 위해 가축분뇨 처리시설의 액비 발효조에서 발생하는 발효열을 확인하였다. 호기성 액비화를 위한 발효조의 온도가 균일성을 나타낸 특성과 34.5 ~ 43.9 ℃의 범위에서 운영되는 점을 고려하여 실험 온도 수준을 35, 40, 45 ℃로 설정하였다. PE 및 STS 파이프로 구성된 복합열교환기는 53.5, 65.6, 74.4 MJ/h 열에너지를 회수하고, 5 RT 용량의 히트펌프는 95.6, 96.1, 98.9 MJ/h 열에너지를 축열 하였으며, 이때 히트펌프의 난방성능계수는 4.53, 4.62, 4.65이었다. 발효조의 온도를 45 ℃로 가정한 열교환기의 최대 온수 생산능력을 급탕량 산정 방법으로 비교했을 때 56 360 kcal/day의 에너지 공급량을 확인하였다. 축열조와 연계된 FCU의 온풍 난방능력은 20.8 MJ/h, 에너지 이용효율은 96.1 %였다. FCU의 온풍으로 퇴비를 건조하였을 때 초기함수율 50.5 %에서 건조 후 함수율 45.8 %로 4.7 % 감소함을 확인할 수 있었다.

Keywords

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