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首页> 外文期刊>Combustion Science and Technology >NATURAL GAS COMBUSTION IN A FLUIDIZED BED HEAT-TREATING FURNACE
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NATURAL GAS COMBUSTION IN A FLUIDIZED BED HEAT-TREATING FURNACE

机译：流化床热处理炉中的天然气燃烧

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摘要

Natural gas-fired fluidized beds have been used industrially for low and medium temperature heat-treating systems for quite some time. Attempts at building higher temperature systems for high carbon steel heat treating have been less successful. There has been little academic work done examining the natural gas combustion process in these types of furnaces. Several studies have been conducted on gas combustion in a fluidized bed, but nearly all these studies have been carried out in laboratory-scale systems. It is well known that many phenomenon in fluidized beds do not scale in a predictable fashion, and therefore industrial scale studies in to the natural gas combustion process are warranted. To provide sufficient information to assist in the development of a fluidized bed heat treating furnace capable of heat treating high carbon steel at temperatures in the range of 900℃ and higher, the gas concentrations at various levels in the furnace under pre-mixed conditions were examined. Pollutant emissions (NO_X and CO) were also examined over a range of operating conditions. It was found that, at temperatures below 750℃, combustion only occurs at the top of the bed, with no evidence of combustion in the bed. Combustion only begins to move into the bed when temperatures reach approximately 750℃, with full combustion occurring in the bed at temperatures above 900℃. When combustion occurs completely in the bed, it occurs in the lower part of the bed. As a result, a zone is formed from the top of the combustion zone to the bed surface, which has a low oxygen concentration. This zone therefore offers a protective environment for the heat treatment of the high carbon steel without significant oxidation and decarburization occurring on the steel surface. The depth of this zone is a function of bed temperature and fluidizing gas velocity. The emissions of NO_X and CO are functions of bed temperature and gas velocity in pre-mixed combustion. The mechanisms behind these phenomena are also discussed in this paper.
机译：天然气流化床已经在工业上用于低温和中温热处理系统了相当长的时间。建立用于高碳钢热处理的高温系统的尝试不太成功。很少有学术性工作研究这些类型的炉子中的天然气燃烧过程。已经对流化床中的气体燃烧进行了一些研究，但是几乎所有这些研究都是在实验室规模的系统中进行的。众所周知，流化床中的许多现象并没有以可预测的方式结垢，因此，有必要对天然气燃烧过程进行工业规模的研究。为了提供足够的信息以帮助开发能够在900℃或更高温度下对高碳钢进行热处理的流化床热处理炉，在预混合条件下检查了炉中不同浓度的气体浓度。在一系列操作条件下，还检查了污染物排放（NO_X和CO）。结果发现，在低于750℃的温度下，燃烧仅在床的顶部发生，没有在床中燃烧的迹象。当温度达到约750℃时，燃烧才开始移入床内，而在900℃以上的温度下，床中会发生完全燃烧。当燃烧完全在床中发生时，它在床的下部发生。结果，从燃烧区的顶部到床表面形成了一个区域，该区域具有低的氧气浓度。因此，该区域为高碳钢的热处理提供了保护环境，而不会在钢表面上发生明显的氧化和脱碳。该区域的深度是床温和流化气体速度的函数。 NO_X和CO的排放是预混燃烧中床温和气体速度的函数。本文还讨论了这些现象背后的机制。

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