WANGLi-hua.Waste Heat Recovery of Sludge Drying Exhaust Gas Based on Heat Pipe[J].China Water & Wastewater,2022,38(17):112-116.
Waste Heat Recovery of Sludge Drying Exhaust Gas Based on Heat Pipe
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第17期
Page:
112-116
Column:
Date of publication:
2022-09-01
- Abstract:
- The waste heat of sludge drying exhaust gas was recovered by low temperature gravity heat pipe, so as to realize the waste heat utilization of sludge drying exhaust gas at approximately 80 ℃. Firstly, the process scheme of heat pipe recovering waste heat from sludge drying exhaust gas was explored based on a sludge drying and incineration project in Shanghai, and the design method of heat pipe heat exchanger was determined. Then, a field test was carried out, and the exhaust gas (flow rate of 200 m3/h) was extracted from a dryer of an actual project for waste heat recovery. The sludge drying exhaust gas in the evaporation section of the heat pipe decreased from 81.1 ℃ to 50.7 ℃, the temperature of fresh air increased from 31.3 ℃ to 69.5 ℃ after heat exchange, and the flow rate reached 2 384.2 m3/h, indicating that the heat pipe effectively avoided energy waste. According to the field test results, the heat transfer coefficient of the heat pipe was 79.99 W/(m2·℃), and the heat loss was 4.5%. Therefore, it is feasible and effective to apply low temperature heat pipe to recover waste heat from sludge drying exhaust gas.
Last Update:
2022-09-01