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가열로내에서 Slab온도예측 수식모델
A Mathematical Model for Predicting Slab Temperature in Reheating Furnace
HWAHAK KONGHAK, June 1985, 23(3), 137-143(7), NONE
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Abstract
가열로내에서의 slab온도를 예측하기 위한 2차원열전달 수식모델을 유도하였다. 이 모델은 가열로내에서 slab, 분위기가스 및 노벽에 의한 복사 열전달과 slab내부에서 길이와 두께방향의 온도구배에 의한 전도 열전달을 고려하였으며, 유도한 식을 차분법을 이용하여 가열로내의 slab 온도를 계산하였다.
모델의 타당성을 검토하기 위해서 No. 4 조압연기 후단에서 pyrometer에 실적 slab 평균추출온도와 모델에서 계산된 slab 평균추출온도를 비교하였으며 그 결과 본 모델은 slab온도예측정도를 약 6 ℃ 향상시켰다.
모델의 타당성을 검토하기 위해서 No. 4 조압연기 후단에서 pyrometer에 실적 slab 평균추출온도와 모델에서 계산된 slab 평균추출온도를 비교하였으며 그 결과 본 모델은 slab온도예측정도를 약 6 ℃ 향상시켰다.
A mathematical model based on two-dimensional heat transfer for predicting slab temperature in reheating furnace was derived. This model takes into account the radiation heat transfer between the slab and atmosphere gases and furnace walls, and the conduction heat transfer by temperature gradient in the length and the thickness direction within the slab. The slab temperature was calculated from the derived equation by using the difference method.
To vertify this model, actual slab average extraction temperature which could be estimated by the temperature after No 4 roughing mill using a pyrometer was compared with the calculated value. Results from this model showed that the accuracy of predicting slab temperature enhanced abot 6 ℃.
To vertify this model, actual slab average extraction temperature which could be estimated by the temperature after No 4 roughing mill using a pyrometer was compared with the calculated value. Results from this model showed that the accuracy of predicting slab temperature enhanced abot 6 ℃.