【摘要】 针对传统辊底式明火热处理炉降温效率低、温度不均匀的问题，提出了一种新型快速降温方法，并进行了试验验证。传统方法依赖自然降温或简单的冷却通风系统，降温缓慢(600℃降至200℃需66 h),温度分布不均，导致钢板力学性能差异大，影响产品质量和生产效率。新型降温方法综合运用五项措施：(1)烧嘴冷却交替脉冲循环，提高降温速率和温度均匀性；(2)增加炉膛负压的同时提升炉门高度，增加冷空气吸入；(3)增加排烟风机频率，控制炉膛压力；(4)钢板吸热辅助降温：利用常温大规格钢板吸热；(5)加快热气扰流：提高炉顶循环风机频率，加快炉内热气混合。在热处理炉的对比试验中，新型方法将600℃降至200℃的降温时间缩短至26.9 h,降温速率提高至少两倍。力学性能测试显示，采用新型降温方法的钢板抗拉强度和屈服强度横向差异分别小于0.40%和0.41%,显著优于传统方法。该方法有效提升了生产效率，改善了产品质量，具有显著的经济和环保效益。更多还原

【Abstract】 A novel rapid temperature adjusting method is proposed and experimentally validated to find a solution to the issues of low temperature dropping efficiency and uneven temperature distribution in traditional roller hearth open-flame heat-treatment furnace. Traditional methods rely on natural cooling or simple forced air cooling systems, resulting in slow cooling rates(66 h to cool from 600 ℃ to 200 ℃) and uneven temperature distribution. This leads to significant variations in the mechanical properties of the steel plates, impacting product quality and production efficiency. The novel cooling method integrates five measures:(1) alternating pulse cooling of the burners to improve both cooling rate and temperature uniformity;(2) increasing furnace negative pressure while raising the furnace door to enhance cold air intake;(3) increasing the exhaust fan frequency to control furnace pressure;(4) auxiliary cooling by steel plate, large-specification steel plates to absorb heat; and(5) accelerating hot gas turbulence by increasing the frequency of the top circulating fan to promote better heat mixing within the furnace. Comparative tests on a roller hearth annealing furnace demonstrate that the novel method reduces the cooling time from 600 ℃ to 200 ℃ to 26.9 h, representing at least a two-fold increase in cooling rate. Mechanical property tests show that the steel plates treated with the novel method exhibit significantly lower transverse variations in tensile strength and yield strength(less than 0.40% and 0.41%, respectively) compared to the traditional method. This novel method significantly improves the production efficiency, enhances product quality, and offers substantial economic and environmental benefits.更多还原