Antifreeze electric heating case and pipeline conservation on offshore drilling platforms
In winter, the ambient temperature in the Bohaya Sea reaches-30 degrees Celsius. If the insulated pipelines and containers of the offshore oil drilling platform have no antifreeze and heat preservation measures, none will be damaged by freezing. How to ensure that pipelines are not frozen damaged has become the key to the continuous safe operation of the drilling platform during the winter.
This is an ideal way to heat and maintain the pipeline with a self-regulating electric heating belt. This electric heating belt reduces electrical energy and converts it into thermal energy sufficient to heat the pipeline to compensate for the heat loss in the pipeline. And it can also be changed according to the change of ambient temperature. The generation of electricity not only limits the temperature from too high, but also saves electricity, so that the temperature of the pipeline itself is always higher than the freezing point temperature so that the liquid in the pipeline does not freeze.
Parameters of self-regulating electric heating cable
Features of self-regulating temperature heating cable
(1) Automatic adjustment of output power and compensation according to the actual amount of heat required by the electric heating system This is a new generation of energy-saving constant temperature heaters.
(2) It can be arbitrarily shortened or lengthened within a certain range, and it allows multiple overlapping without fear of overheating and igniting.
(3) Low temperature, fast start and uniform temperature, as each part can be automatically adjusted according to the temperature change of the heating part.
(4) Easy installation, easy maintenance, 24-hour service, high automation, low operation and maintenance costs.
(5) Safety and reliability, wide application, no pollution, long service life.
In September 2022, as a long-term partner, we installed an electric heating system for the Israeli drilling platform CNOOC Boshang. For this design, we provided not only self-regulating electric heating cables, constant power electric heating cables, but also there are leather electric heating cables.
The practice has shown that the application of antifreeze electric heating and heat preservation technology on offshore drilling platforms gives good results, providing a reliable guarantee of the safety of offshore operations in winter.
Electric heating cable is a heating method that uses insulation resistance or resistance heating wire to create a temperature after power supply. It can automatically adjust the output temperature and reasonably maintain the process temperature requirements to keep warm, raise the temperature and protect the heating equipment from freezing. The insulation and antifreeze effect of the container is very good.
Transport of heavy oil through the pipeline over long distances and long-term retention in the pipeline will result in a drop in temperature due to heat dissipation and increased viscosity, which will cause the pipeline to be blocked by freezing or condensation-related accidents. Electric heating is widely used as effective insulation of pipelines and anti-freeze protection.
According to the statistics of the Hydrometeorological Center, the average daily minimum temperature at the location of the CNPC tank farm is 5 ° C, and the average daily maximum temperature is 14 ° C. Since the freezing point of the PX is about 15 °C, the supply pipeline needs heat preservation and heating. The oil depot has been in operation for many years without a stable source of steam, therefore, this project is considering the use of electric heating technology.
Long-distance crude oil pipelines with a high paraffin content with freezing temperatures above 50 °C. According to the requirements of the production plan of the plant, the volume of oil transportation through the pipeline is 150 thousand rubles. Tons per year, maximum-200 thousand. Tons per year.. According to the thermodynamic analysis of the pipeline, the initial supply temperature of the pipeline is 80 ° C (TN), and the temperature of the end entering the tank is 60 ° C (Tu). Since the transportation temperature needs to be adjusted according to the time of year, it sometimes needs to be transported by heat.
In petrochemical engineering, trunk infusion pipelines are the lifeblood of the factories. The temperature in the northern region is too low in winter and the pipeline needs to be insulated to compensate for the heat loss due to the low temperature in winter to ensure the normal operation of the pipeline.
The toughness of the asphalt is greatly affected by the temperature. When the temperature decreases, the toughness of the asphalt increases, and the drop in resistance of the asphalt during pipeline transportation increases; when the temperature falls below the freezing point, the asphalt solidifies, causing the pipeline to clog and the conveyor belt to come to trouble. Therefore, electric heating and heat preservation during the transportation of asphalt are very important.
To solve many problems in the "three high levels" crude oil extraction process, the thermal energy generated by the electric heating is used to heat the crude oil in the oil pipe throughout the process to improve the fluidity of the crude oil. Effectively solve various technical problems encountered in the operation of high-condensation, high-viscosity and high-paraffin crude oil, and achieve the goal of improving the productivity and efficiency of oil wells.