THERMAL CALCULATION OF ELECTRICAL HEATING OIL AND GAS BURIED PIPELINES AND EXPERIMENTAL RESEARCH

摘要

Physical and mathematic models of electrical heating buried pipelines are set up on the basis of considering the influence of the changing of environmental temperature, earth temperature field, pipeline's diameter, parameters of running, physical properties and other correlative factors. After calculating and analyzing, the earth temperature fields and the required electrical heating power of buried pipelines are obtained. And a set of in-indoor experimental rig is designed and installed to simulate the running of buried electrical heating oil and gas pipelines. According to the actual running state of the electrical heating pipelines, different circumstances and running states are designed and tested. According to the experimental results, earth temperature fields around electrical heating buried pipelines are drawn to revise the physical and mathematic models and to analyze the changing rules of earth temperature field in Daqing. By comparing the results of numerical simulation calculation with the testing results of electrical heating transportation craft of the eighth plant of mud oil in Daqing oilfield company limited , there are good agreements. The procedure based on this computing method in the paper can be used to conduct the power design of electrical heating buried pipes and the management of safely running.