| 학회 |
한국화학공학회 |
| 학술대회 |
2008년 가을 (10/23 ~ 10/24, 부산 BEXCO) |
| 권호 |
14권 2호, p.2820 |
| 발표분야 |
에너지 |
| 제목 |
Study of heat transfer characteristics of preheating system for sewage sludge |
| 초록 |
The preheating system of sewage sludge has been investigated to increase energy efficiency of the drying system. In the current drying system, energy consumption is about 1.3 ~ 1.5 times compared with the energy to evaporate moisture contained in sewage sludge. In general, air is used as a carrier gas in the drying system, so the dryer outlet gas is composed of air and steam. The temperature range of the dryer outlet gas is above 90oC enough to preheat sewage sludge. The objective of the preheating system is to exchange heat between dryer outlet gas and sewage sludge of room temperature to save energy consumption in the drying system. In this study, 1 ton/day sewage sludge preheating system is designed as shell-and-tube type heat exchanger. In order to investigate heat transfer characteristics, the overall heat transfer coefficient is firstly calculated using water instead of sewage sludge. Then, the overall heat transfer coefficient is calculated using sewage sludge, varying dryer outlet gas temperature from 90oC to 110oC. The overall heat transfer coefficient in the experimental ranges is between 50 and 150 W/m2oC for both water and sewage sludge. |
| 저자 |
박영철, 진경태, 이승용, 최상일, 김정근, 황갑진, 이상호
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| 소속 |
한국에너지기술(연) |
| 키워드 |
Drying system; Sewage sludge; Preheater; Heat transfer
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| E-Mail |
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| 원문파일 |
초록 보기 |
