加熱爐壁廢熱回收熱電發電系統設計與應用

Design and Application of Thermoelectric Generators on the Waste Heat Recovery from Heating Furnace Wall

方俊仁(Chun-Jen Fang)

《臺灣鑛業》 69卷3期 (2017/09) Pp. 23-33

摘要

中鋼公司目前廢熱回收大都屬於高溫大型廢熱回收，對於加熱爐壁等中小型低溫廢熱（100~180℃），則尚無回收機制且有其技術困難度，間接形成能源浪費。本研究以一維穩態熱網路理論模型搭配實驗測試，建立熱電系統熱設計技術，並在廠內完成1 套1kW 級之加熱爐壁廢熱回收熱電發電系統建置，為全國第1 套工業節能廢熱回收熱電發電系統應用實例，總計使用504 片熱電模組，熱端採用直接貼壁式設計、冷端則採用水冷散熱鋁板，總安裝面積為5m^2，熱端平均溫度為115.3℃、冷端平均溫度為33.2℃、冷熱端溫差為82.1℃，平均發電密度200W/m^2，每年可發電約1 萬度，可減少約7 公噸CO2 排放量，並降低爐區作業環境溫度約10℃。

關鍵字

加熱爐壁 ； 廢熱回收 ； 熱電發電系統（TEG）

並列摘要

The high temperature massive waste heat in China Steel Corporation is mostly recovered. However, the low temperature (100~180℃) grade waste heat such as the waste heat from heating furnace wall is not reused economically and is directly emitted to the environment causing energy dissipation. In this study, an optimized 1kW thermoelectric generator (TEG) for the heating furnace wall is designed by one-dimensional steady state thermal network method under the constraint of without affecting the normal operation of the furnace. The TEG system is the first application of using thermoelectric technology to recover industrial waste heat in the country. There are 504 thermoelectric modules installed in this TEG system, the interface designs of hot side and cold side of this system are using direct contact concentrator and aluminum cold plate heat exchanger respectively. The total installed area are 5m^2, the average power density is 200W/m^2, the average temperature difference is 82.1℃and the average temperature of the TEG system hot side and cold side are 115.3℃and 33.2℃respectively. The power generated by this TEG system is 10,000 kWh per year and the seven tons of CO_2 emissions can be reduced. Besides, the operating environment temperature of heating furnace can also be reduced about 10℃.

並列關鍵字

Heating Furnace Wall ； Waste Heat Recovery ； Thermoelectric Generator (TEG)