无焰含氧燃料在钢材再加热中的成功应用

J. Schéele, Vladimír Zilka
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引用次数: 0

摘要

在钢铁再加热中使用含氧燃料燃烧可以提高产量并节省大量燃料。因此,含氧燃料有许多优点,但也有一些缺点,如炉内的热点和热NOx的产生。然而,通过创造“体积燃烧”使燃烧“无焰”,这些问题可以被克服,并且可以实现额外的优势。本文介绍了不同的解决方案,包括完全无焰和半无焰,已开发和实施的钢的再加热和退火炉。在过去的三十年里,林德已经在所有类型的加热炉上安装了160多个氧燃料装置,包括间歇式和连续式加热炉,用于生产所有不同的钢种。自2003年以来,该公司一直专注于使用无焰含氧燃料,迄今为止已成功安装了112台,其中90台完全使用100%无焰含氧燃料。本文描述了这些装置的结果,包括节省高达60%的燃料,提高高达50%的吞吐量,大幅减少二氧化碳和氮氧化物排放,大大改善了加热钢的温度均匀性,减少了高达50%的水垢损失。将介绍从空气燃料转换为无焰含氧燃料的情况。这些例子包括安装在均热炉、转底炉、辊底炉和步进梁炉上,额定容量高达300t /h,并用于美国、欧洲和亚洲公司的碳钢、工程钢和不锈钢的生产。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
SUCCESSFUL USE OF FLAMELESS OXYFUEL IN STEEL REHEATING
Using oxyfuel combustion in steel reheating provides higher throughput and substantial fuel savings. Accordingly, oxyfuel has many benefits, but also some drawbacks like hot spots in furnaces and thermal NOx generation. However, by making the combustion “Flameless” by creating a ‘volume combustion’, these issues can be overcome, and additional advantages can be achieved. This paper describes different solutions, both fully flameless and semi flameless, which have been developed and implemented in steel reheating and annealing furnaces. Over the past three decades, Linde has made more than 160 oxyfuel installations in all types of reheating furnaces, both batch and continuous, and for production of all different steel grades. Since 2003, focus has been on using Flameless Oxyfuel, hitherto resulting in 112 successful installations, 90 of these operating fully with 100 % Flameless Oxyfuel. This paper describes results from these installations, which include fuel savings of up to 60 %, increased throughput by up to 50 %, substantial reductions of CO2 and NOx emissions, much improved temperature uniformity of the heated steel, reduction of scale losses by up to 50 %. Cases with conversion from air-fuel to Flameless Oxyfuel will are described. These examples comprise installations in soaking pit furnaces, rotary hearth furnaces, roller hearth furnaces, and walking beam furnaces with up to 300 t/h nominal capacity, and for production of carbon steel, engineering steel, and stainless steel grades at companies in USA, Europe, and Asia.
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