| FANG Rui,LI Jian,WU Ting-ting.Energy Saving and High Production Efficiency of Cold Rolled Hot-dip Galvanizing Annealing Furnace[J],45(6):42-48 |
| Energy Saving and High Production Efficiency of Cold Rolled Hot-dip Galvanizing Annealing Furnace |
| Received:April 07, 2016 Revised:June 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.06.007 |
| KeyWord:annealing furnace equipment improvement process parameters energy reduction thermal efficiency |
| Author | Institution |
| FANG Rui |
Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai , China |
| LI Jian |
Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai , China |
| WU Ting-ting |
Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai , China |
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| Abstract: |
| Objective To analyze the heating period of thermal operation and the problems existing in the structure of cold rolled continuous hot-dip galvanizing annealing furnace(CAF) and give reasonable solutions by means of thermal test and structural examination. Methods Regarding preheating section (PHS) and direct-fired heating section(DFS) as a system, and radiation heating section as another, appropriate test scheme and examination details were adopted, involving the real-time measurements of temperature, pressure, flow rate and gas composition. Results The control and choice of DFS and RHS burner process parameters were not appropriate. The former had a low utilization rate of fuel because of excessive control atmosphere in furnace by lower air coefficient too much, the latter had a low heat utilization rate due to the inaccurate inlet mode leading to inhalation of excess air. Meanwhile, there were other problems such as under-explored gas waste heat recovery and service life of thermal insulation material. Conclusion Moderately increasing DFS air coefficient, changing RHS air inlet mode to “pumping-blowing”, improving the gas waste heat recovery equipment and methods, regularly monitoring temperature fluctuations on the furnace wall surface will be helpful for saving energy, reducing consumption of fuel and improving the thermal efficiency of annealing furnace. Rectification results showed that the thermal efficiency of PHS/DFS section was increased from 51.8% to 60%, and that of RHS section was increased from 44.3% to 55.8%. |
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