The skin effect heating cables can be used for oil trunk pipelines on offshore platforms.
Published on:
2023-03-09 11:51
According to the characteristics of the transport environment, the pipeline can be divided into non-insulated pipeline, insulated pipeline and thermally insulated pipeline. Gasoline, kerosene, etc. D. Usually not transported by insulated pipelines, agricultural diesel, fuel oil, periodically transported crude oil, etc. D. Are usually transported through electrically heated insulated pipelines, and continuous crude oil is usually transported through insulated pipelines. The purpose of heat preservation is to reduce heat loss and save energy. Satisfy the production process, maintain and develop production capacity, and prevent surface burns and improve the working environment.
Three electric heating methods are commonly used: the accompanying pipe, the jacketed pipe, and the electric heating cable. The heating medium includes hot water, steam, thermal oil, and electrical energy. Marine platforms use electric heating due to lack of space. Electric heating is safe, reliable and convenient in construction. The daily maintenance workload is small, the effective energy utilization rate is high, and the operating cost is low, the maintained temperature can be effectively controlled to prevent overheating of the pipeline environment.
Electric heating of pipelines is a new technology and a new technology for electric heating and heat preservation in the heat transmission pipelines of petrochemical and other enterprises. Oil, high-condensing oil) pipelines and heating. The leather effect heating method mainly consists of four parts: oil pipe, heating pipe (including heat-resistant cable), insulation layer and protective shell. Both the oil pipeline and the heating pipe are ordinary steel pipes, the diameter of the heating pipe is about 15-40mm, they are welded to the oil pipe by intermittent welding. Depending on the diameter of the pipe and the heating temperature, electric heating with a skin effect can be divided into single-tube, double-tube and three-tube. The heat-resistant cable is put into an electric heating pipe, and an alternating current of electrical phase is supplied to one end of the cable. When the AC is passed through the cable and the heating pipe, due to the skin effect and proximity effect, the current is unevenly closed Twenty Concentrate on the inner surface of the heating tube to flow. The cross-section of the surface layer wire on the pipe wall is reduced, and the angular force resistance is greatly increased. With the same current, the heating pipe receives a large electric heating power, and the oil pipeline is heated by thermal conductivity.
If the heat capacity of the heating element simply compensates for the heat loss under normal conditions, not only the start time will be large, but the utilization rate of the pipeline will also be low. In order to start heating, you need a little more electric heating power. However, if the power is too large, the start time will be short. Although heat energy can be saved, the cost of equipment will increase. Operating fees will increase during normal operations. Therefore, it is necessary to determine the total operating time, physical time and number of starts and stops during the year to determine the most economical thermal power.
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