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以火用经济学的有关理论和方法为基础,利用热火用和压火用不同的价格,将管输原油过程的火用流值折合成费用,计算火用耗费用和剩余火用费用,火用耗费用与投资费用之和与剩余火用费用的比值定义为火用耗指标。以此为基础分别计算并分析火用耗指标随输量的变化规律,从而确定最优输量。以大庆油田某输油管道为研究对象的实验表明:压火用耗值随着输量的增大先减小后逐渐增大;热火用耗值随着输量的增大逐渐减小;总火用耗费用随着输量的增大先减小,在输量为50m3/h时减小至最小值,之后又逐渐增大。通过计算可知,火用耗指标先减小而后有缓慢增大,在输量为60 m3/h时为最小值,即最优输量为60 m3/h。
Based on the relevant theories and methods of exergy economics, the exergy flow value of the process of transporting crude oil is converted to the expense by using the different prices of heat exergy and suppressor fire, and the exergy expense and remaining exergy expense are calculated. The fire Expenditure and investment costs and the ratio of the remaining exergy cost is defined as the exergy consumption index. On the basis of this, we calculate and analyze the change rule of exergy consumption index with the change of output, so as to determine the optimal output. Experiments on an oil pipeline in Daqing Oilfield show that the consumption value of crushers decreases first and then increases with the increase of the output. The heat consumption decreases with the increase of the total output. With the cost of consumption increases with the increase of the first decrease in the output of 50m3 / h reduced to a minimum, and then gradually increased. It can be seen from the calculation that the exergy consumption index first decreases and then increases slowly, and reaches the minimum when the output is 60 m3 / h, that is, the optimal output is 60 m3 / h.