气体碳氢化合物的导热系数随温度或压力的升高而增大。求解方法有查图、查表和经验公式计算。The thermal conductivity of gaseous hydrocarbons increases with the increase of temperature or pressure. The solution methods include graph, table and empirical formula.计算法：先求低压气体导热系数，然后计算混合气体与高压下导热系数Calculation method: the thermal conductivity of low pressure gas is calculated first, and then the thermal conductivity of mixed gas and high pressure is calculated