天然气预热温度对蓄热式加热炉内温度场和NO_x排放影响的研究  

Study on the influence of the air preheating temperature of natural gas on the temperature distribution and NO_x emission in regenerative heating furnace

作　　者：刘公正 张玲玲[2] 苍大强[1] 李子亮[1] 王东[1] 

机构地区：[1]北京科技大学冶金与生态工程学院 [2]北京科技大学能源与环境工程学院

出　　处：《冶金能源》2017年第3期27-30,37,共5页Energy For Metallurgical Industry

基　　金：国家自然科学基金(51234008)

摘　　要：为了研究不同天然气预热温度对蓄热式加热内炉温度场和NO_x排放的影响,对加热炉操作参数进行优化。采用fluent软件中标准k-ε模型、P-1辐射模型、涡耗散模型、热力型NO_x模型对不同天然气预热温度情况下加热炉内的速度场、温度场、浓度场进行数值模拟分析。结果表明:提高天然气的预热温度,减小了炉膛中心区域的流速,有利于炉膛内火焰的轴向扩散,高温区域也有变小的趋势,炉膛温度趋于均匀。随着天然气预热温度的升高,炉膛最高温度近线性增大,平均温度先减小后增大,CH_4浓度近线性降低,O_2浓度近指数型增加,NO浓度先减后增,且NO的高浓度区域分布与高温区域基本对应。In order to study the influence of different preheating temperature of natural gas on the tem-perature distribution and N0X emission in the regenerative heating furnace, optimized the operating pa-rameters of the furnace. The study used the standard k - s model, P - 1 radiation model, eddy dissipa-tion model and thermodynamic N0X model in fluent software to simulate the temperature field and con-centration field in the heating furnace under different natural gas preheating temperature. The results show that the increase of preheating temperature of natural gas reduces the flow rate of the central re-gion of the furnace, and it is conducive to the radial diffusion of flame in the furnace, the tendency of the high temperature area is smaller, and the furnace temperature is nearly uniform. With the increase of the air preheating temperature of natural gas, the maximum temperature of the furnace increases lin-early and the average temperature decreases and then increases, CH4 concentration decreases near line-arly, 02 concentration increases near exponentially, NO concentration decrease first and then in-creased ,and regional distribution of high concentration of NO is corresponded to high temperature region.

关 键 词：加热炉 蓄热燃烧 天然气 预热温度 

分 类 号：TK175[动力工程及工程热物理—热能工程]