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首页> 外文会议>McMaster symposium on iron and steelmaking;Symposium on the challenges of coal injection in today's blast furnaces; 20080923-25;20080923-25; Hamilton(CA);Hamilton(CA) >Burden Distribution Challenges at IH-7 Blast Furnace Resulting From New Furnace Lines, High Pellet Percentage and High PCI Rate
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Burden Distribution Challenges at IH-7 Blast Furnace Resulting From New Furnace Lines, High Pellet Percentage and High PCI Rate

机译：新生产线，高球团率和高PCI率导致IH-7高炉的负荷分配挑战

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摘要

During the 2003 reline the throat diameter of IH-7 blast furnace was increased from 10.2 to 11 meters. The working volume of the furnace was increased by replacing high density cooling plates with copper and cast iron staves. The new furnace lines compounded with a high percentage of pellets, 85% and greater, presented new burden distribution challenges. Fundamental changes in our historic burden distribution philosophy were made in three phases. The first was to achieve the same gas flow stability experienced prior to the change in furnace lines and working volume. This was a priority due to the very high heat loads early in the campaign. The second phase of distribution changes were driven by the push for increasing daily furnace productivity above the 2.75 mt/m~^3 range while maintaining the target pci rates of 180kg/mthm. The need for permeability and charging capacity resulted in strong central flow and thick ore layers. The final burden distribution change was from a CCOO pattern with one of the largest layer thicknesses in the industry to a COCO format and a very thin layer structure. This pattern improved charging capacity and allowed for lower central temperatures at the stockline and improved process stability.
机译：在2003年的改造中，IH-7高炉的喉口直径从10.2米增加到11米。通过用铜和铸铁冷却壁代替高密度冷却板，增加了熔炉的工作量。新的熔炉生产线与高比例的球团（85％或更高）复合，带来了新的负荷分配挑战。我们历史上的负担分配理念在三个阶段进行了根本性的改变。首先是要达到改变炉线和工作量之前所经历的相同气流稳定性。由于运动初期的热负荷很高，因此这是当务之急。分配变化的第二阶段是通过推动日炉生产率提高到2.75 mt / m〜^ 3范围以上，同时将目标pci率保持在180kg / mthm的推动而实现的。对渗透率和装料能力的需求导致强大的中心流动和厚的矿石层。最终的负担分布变化是从具有业界最大的层厚度之一的CCOO模式到COCO格式和非常薄的层结构。这种模式提高了充电容量，并降低了生产线的中心温度，并提高了工艺稳定性。

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