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首页> 外文期刊>Ironmaking Conference Proceedings >Extent of Coal Combustion in the Blast Furnace at Different Coal Injection Rates and Different Blast Furnace Parameters
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Extent of Coal Combustion in the Blast Furnace at Different Coal Injection Rates and Different Blast Furnace Parameters

机译：不同注煤量和不同高炉参数下高炉内煤的燃烧程度

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The injection of constantly increasing amounts of coal in the blast furnace is an important research assignment because of the drop in hot metal costs and for environmental reasons. No selective measurements of the extent of coal conversion in the blast furnace or investigation of factors influencing the extent of coal conversion have been carried out to date. Accordingly, at blast furnace 1, Schwelgern, an inclined horizontal probe (inclination 35~0) was used to provide 9 measuring points above the furnace radius at the top, and 15 gas sampling points were installed along the furnace height (1.2 - 21.5 m above the tuyere level), at which gas can be simultaneously sampled and analyzed. At the same time dust can be removed from the gas, which can then be analyzed for C_(coke) and C_(coal). This made it possible to measure the extent of coal conversion in the blast furnace in relation to different influencing factors such as coal injection rates, coal properties, oxygen enrichment and the radial flow of gas and other blast furnace parameters. The tests were carried out with coal injection rates between 130 and 190 kg/t HM, oxygen contents between 22.5 and 24.1 %, and volatile components in the injected coal between 18 and 42 %, and under different radial gas flow conditions at the top. The amounts of dust caught with the aid of the inclined probe are highest in the centre of the furnace and at the periphery of the blast furnace. The dust mainly consists of carbon, iron oxides and alkalis. The iron oxide content is at a maximum at the furnace periphery on account of the greater degree of burden degradation here, and the alkali content in the furnace centre on account of the high temperatures prevailing here. The C_(coal) content is also highest in the centre of the furnace. Observations of the course of ETA CO and % H_2 values above the furnace radius at the top show that gas conversion generally accords with the water shift reaction, but that the composition of the gas in the furnace centre often does not accord with this correlation, and is heavily determined by the coal rising in the blast furnace and still emitting its volatile parts in the upper shaft. Accordingly, it is not surprising that the H_2 contents measured in the furnace centre are correlated with the C_(coal) contents in the dust. Rising coal injection rates lead to increasing C_(coal) contents in the dust. This can be counteracted by increasing the added oxygen. No influence of volatile matter on the extent of coal conversion in the blast furnace was detected.
机译：由于铁水成本的下降和环境原因，在高炉中注入不断增加的煤量是一项重要的研究任务。迄今为止，尚未进行高炉中煤转化率的选择性测量或影响煤转化率的因素的研究。因此，在高炉1处，Schwelgern用倾斜的水平探针（倾斜度为35〜0）在炉膛上方上方提供9个测量点，并沿炉膛高度（1.2-21.5 m）安装了15个气体采样点。高于风口水平），在此可以同时对气体进行采样和分析。同时可以从气体中去除灰尘，然后可以分析其C_（焦炭）和C_（煤）。这样就可以测量高炉中煤的转化程度，它与不同的影响因素有关，例如喷煤速度，煤的性质，氧气富集和气体的径向流量以及其他高炉参数。在顶部不同径向气流条件下，煤的注入量为130至190 kg / t HM，氧含量为22.5至24.1％，煤中的挥发性成分为18至42％时进行了测试。借助倾斜探针捕获的灰尘量在炉子的中心和高炉的外围最高。灰尘主要由碳，氧化铁和碱组成。由于这里的炉渣降解程度较大，因此在炉膛周围的氧化铁含量最大，而由于高温在炉膛中心的碱含量在此处较高。炉中央的C_（煤）含量也最高。对顶部上方炉膛半径以上的ETA CO和％H_2值的过程的观察表明，气体转化率通常与水转化反应相符，但是炉膛中心的气体成分通常与这种相关性不符，并且在很大程度上取决于高炉中上升的煤并仍将其挥发性部分排放到上部竖井中。因此，在炉中心测得的H_2含量与粉尘中的C_（煤）含量相关就不足为奇了。喷煤速率的提高导致粉尘中C_（煤）含量的增加。这可以通过增加添加的氧气来抵消。未检测到挥发性物质对高炉中煤转化程度的影响。

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