塔一联含氮天然气对加热炉燃烧的影响

Effect of natural gas containing nitrogen on combustion of heating furnace in No.1 combined station of Tahe Oilfield

关键词:  含氮天然气  加热炉  燃烧  数值模拟  掺混方案

Key words:  nitrogen-containing natural gas  heating furnace  combustion  numerical simulation  blending scheme

摘要:

为解决塔河油田注氮开采导致天然气含氮量上升而造成的天然气燃烧炉燃烧过程不稳定的问题,基于数值模拟软件Fluent,对塔一联含氮天然气在加热炉锥形燃烧室中温度场的分布规律及燃烧产物NO_x的生成规律进行了研究,并针对塔一联含氮天然气组分的特殊性,分别以燃烧效率、NO_x浓度、引燃温度、发热量及沃泊指数为基准,对掺混方案进行计算,并对4种掺混方案进行对比分析。确定选用基于NO_x浓度的含氮天然气掺混方案,可保证塔一联含氮天然气燃烧过程燃烧效率、引燃温度、发热量及沃泊指数要求的同时,有效减少氮氧化合物带来的环境污染,具有较强的实际意义。

Abstract:

In order to solve the unstable combustion process of natural gas combustion furnace due to increase of nitrogen content in natural gas caused by the injection of nitrogen in Tahe Oilfield,based on the numerical simulation software Fluent, which is for the tower-linked natural gas containing nitrogen in the furnace conical combustion chamber, the distribution law of temperature field and the formation law of combustion product NO_x are researched in this paper. According to the particularity of the natural gas component of the nitrogen of the tower, the combustion efficiency, NO_x content, ignition temperature and heating value and Webbo index used as the benchmark for the blending scheme,four blending schemes are calculated and compared. A nitrogen-containing natural gas blending scheme based on NO_x content, which will ensure the combustion efficiency, ignition temperature and calorific value and Webbo index of the tower-linked natural gas containing nitrogen is selected. At the same time, this scheme will effectively reduce the environmental pollution caused by nitrogen oxides, and has strong practical significance.