基于数值模拟的小型玻璃熔窑天然气掺氢燃烧及其对熔窑性能影响的研究

Numerical Simulation of Hydrogen-Enriched Natural Gas Combustion in Small-Scale Glass Furnace and Its Impact on Furnace Performance

节能降碳是我国当前重要的能源战略,天然气掺氢燃烧是减少碳排放的重要措施之一。通过数值模拟,在小型玻璃熔窑中以掺氢天然气作为燃料,探究不同掺氢比例的燃烧特性及其对熔窑特性的影响。研究表明:在不改变现有窑炉供气管道结构以及燃料总流量的情况下,随着天然气中氢气(H_(2))体积分数由0增加至25%,燃烧火焰的长度及覆盖面减小,火焰峰值温度升高,火焰中的氢氧根(OH^(-))浓度增大;因此,天然气掺氢燃烧对熔窑结构提出了新的要求,对耐火材料、火焰喷枪的耐高温和抗碱性能要求更高。在熔窑特性方面,随掺氢量的增加,炉温与玻璃液面的吸热量先升高后降低,掺氢的体积分数为20%时炉温最高,较不掺氢时升高了20℃;烟气中二氧化碳(CO_(2))体积浓度占比随掺氢比增大而降低,掺氢比例为25%时相比于不掺氢工况降低了7.5%。

Energy-saving and carbon reduction is an important energy strategy in my country,and natural gas mixed with hydrogen is one of the principle measures to reduce carbon emissions.This article used the optical glass melting furnace flame space as the research object,it used natural gas mixed with hydrogen as fuel to simulate the combustion characteristics of different natural gas mixed with hydrogen conditions,and it impacted on the melting process.In the case of not changing the existing gas supply pipeline structure and the unchanged total gas supply flow,research showed that in terms of combustion characteristics,as the hydrogen content in natural gas increases from zero to 25%,the flame length was reduced,and the flame coverage surface decreased,the flame peak temperature increased,and the OH^(-)concentration in flames was increased.Therefore,natural gas hydrogenation put forward new requirements for the structure of the molten furnace and refractory materials,especially the high heat and alkali resistance of the burner and the stove wall.In terms of furnace characteristics,as the amount of hydrogen added increases,the furnace temperature and the heat absorption of the glass surface first increased and then decreased.The furnace temperature was highest under the condition of 20%hydrogen added,which was 20℃higher than that without hydrogen added;The volume concentration of CO_(2)emissions decreased with the increase of hydrogen blending ratio,and the hydrogen blending amount was reduced by 7.5%compared to the no hydrogen mixing condition at 25%.