一、目前燃料气计量中存在的难题炼油装置生产和消耗的燃料气是一种混合气体。混合气体中主要含有H_2、CH_4、C_2H_6、C_2H_4、C_3H_8、C_3H_6、C_4H_10、C_4H_8、C_5H_(12)、CO、CO_2、H_2S、空气等气体,比起单一气体的流量计量较为复杂。在石化企业中,日常的燃料气平衡采用的是质量平衡体系,所以不仅要求体积流量准确,而且要求混合密度计算准确。因此,在气体测量过程中存在以下难点: First, the current fuel gas measurement problems Refined oil production and consumption of fuel gas is a mixture of gases. The gas mixture contains mainly H 2, CH 4, C 2 H 6, C 2 H 4, C 3 H 8, C 3 H 6, C 4 H 10, C 4 H 8, C 5 H 12, CO, CO 2, H 2 S and air. In petrochemical enterprises, the daily fuel gas balance is the use of mass balance system, so not only accurate volume flow requirements, but also requires accurate calculation of mixed density. Therefore, the gas measurement process has the following difficulties: