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通过分析钢坯在炉内的运行过程,推出了用于轧钢加热炉计算机在线最优供热控制模型的生产检测计算的新方法。经计算机仿真验证表明,该法既能保证热负荷调节准确,及时,又能保证过程控制平稳,从而使得Q-P模型对复杂生产条件的加热炉在线优化控制成为可能。 相似文献
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通过对650×1/500×3轧机加热炉空气换热器的使用、测试与计算结果的分析,并根据几座粉煤加热炉的各种换热器多年生产经验的对比,说明粉煤加热炉空气换热器宜选择二级带插件U型管换热器。 相似文献
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A numerical model of billet reheating furnace is proposed, which includes heat fluxes calculation around four billet surfaces and two-dimensional conduction calculation inside billet. Radiation and convection heat fluxes on top and bottom surfaces are calculated simultaneously, based on quartic and linear difference between furnace gas and billet surface temperatures, while furnace gas temperature is determined according to thermocouple values along furnace length together with billet surface temperature. Lateral fluxes are also calculated considering angle factor on billets interval. Two-dimensional partial differential equation is acquired for billet conduction to determine temperature distribution, which is discretised and solved by Alternating Direction Implicit and TriDiagonal Matrix Algorithm. Two embedded thermocouple experiments were carried out to verify furnace gas temperature, the effect of billet interval on lateral heat flux calculation as well as billet temperature. It met agreement well with experiments on billet temperature, which could be a better prerequisite for further reheating furnace automatic control. 相似文献
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带钢步进梁式加热炉节能技术的应用 总被引:1,自引:0,他引:1
莱风轧钢厂带钢国间采用步进梁式加热炉,在生产中应用了热送热装工艺,降低钢坯加热温度,对助燃空气进行预热,提高加热炉保温性能,采用高铲节能型燃烧器,实现计算机控制烧钢等节能技术,使煤气消耗平均降至1.1GJ/t。 相似文献
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介绍了蓄热式燃烧技术在青钢钰尊高线步进梁式加热炉设计中的应用情况。加热炉燃烧系统分三个供热段,采用分隔式空、煤气双预热烧嘴.直通道蜂窝体蓄热体,通过换向系统,实现了“极限余热回收”和高温空(煤)气预热。投用后,加热炉满足节能、无公害及生产操作自动化程度高的要求,钢坯加热温度均匀,吨钢燃耗1.4GJ,氧化烧损率约为0.7%。 相似文献
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Oxidation of low carbon steel in multicomponent gases: Part II. Reaction mechanisms during reheating
H. T. Abuluwefa R. I. L. Guthrie F. Ajersch 《Metallurgical and Materials Transactions A》1997,28(8):1643-1651
Oxidation behavior of low carbon steel during reheating in an industrial walking-beam steel reheat furnace was investigated.
It was observed that scaling (oxidation) rates were reduced by reducing the input air/fuel ratio to the furnace, thereby lowering
concentrations of free oxygen in the combustion products from about 3 to 1.5 pct. Laboratory experiments involving isothermal
and nonisothermal oxidation were carried out in atmospheres consisting of oxygen, carbon dioxide, water vapor, and nitrogen.
A general equation for the prediction of weight gains due to oxidation during reheating, using isothermal oxidation rate constants,
was developed. The prediction of weight gains from nonisothermal oxidation conducted in the laboratory was poor, owing to
a separation of the scale from the metal substrate which took place at about 900 °C. The predicted weight gains during reheating
in the industrial reheat furnace indicated that oxidation rates during reheating were intermediate between linear and parabolic,
especially during reheating with high air/fuel ratio. However, the linear mechanism predominated. Laboratory isothermal experiments
for oxidation in atmospheres containing free oxygen showed that the magnitude of the linear oxidation rates was determined
by the oxygen concentration in the atmosphere. It was concluded that the observed reduction in scaling rates during reheating
of low carbon steel in the industrial reheat furnace was a result of the lower free oxygen level in the furnace atmosphere. 相似文献
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济钢对副产煤气加热炉高效燃烧控制系统进行改造 ,煤气混合系统通过控制焦、高、转炉煤气的比例和压力 ,保证了混合煤气的热值和压力稳定 ;加热炉DCS系统通过控制加热炉废气中残氧量 ,调节空燃比 ,使燃烧达到最佳状态 ,提高了炉内钢坯的加热质量 ,实现了节能降耗和环境保护的目的 相似文献
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钢铁联合企业副产大量的高炉煤气,但高炉煤气因热值低,难于直接用于轧钢加热炉上,许多企业存在高炉煤气富余放散的现象.韶钢通过采用金属换热器对高炉煤气、助燃空气进行双预热,重油-高炉煤气混烧,蓄热式燃烧技术等措施,将高炉煤气用到轧钢加热上,充分利用企业的富余高炉煤气,降低了轧钢工序的生产成本,走出一条发展循环经济的新路子. 相似文献
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煤气热值及空燃比是影响加热炉能耗指标的重要因素之一。通过配置煤气热值仪及烟道残/定氧分析仪,在线、实时检测煤气热值和烟道残氧数值,并通过模型计算,合理、动态地配置空燃比,从而实现降低加热炉吨钢燃耗及氧化烧损率的目的。 相似文献