Application Example of Heating Cable for Ramp Snowmelt on Coal Mine Road
According to statistics, China's combined crude coal production will reach 4,071.36 million tons in 2021, which means a cumulative increase of 4.7%. As of September 2022, China's crude coal production will amount to 386.718 million tons, up 12.3% year-on-year. However, the mountain roads in coal transportation in the mining area are mostly uneven sections of road with ascents and descents. In winter or in cold areas, snow and ice will reduce the coefficient of friction and traction, and the mine vehicle will slip and turn.
In recent years, much research has been done on the problem of melting snow and ice on the roads. In general, the methods of melting snow and ice are divided into two types: the active method and the passive method. The passive method includes manual removal, mechanical removal and deicing agent. The method of active snow melting consists of thermal snow melting, Technologies of anti-ice modified asphalt and special surface layer, etc.
On the long descent of a mountain road in a mining area, the icing phenomenon exists for a long time. If a snow melting agent is often used, it damages the road structure and contaminates nearby soil, vegetation and other ecological environments. Therefore, it is necessary to choose a new method of melting snow and ice with long-term effect and without side effects. This article uses the active melting technology of the snow and ice heating cable. The basic principle is to bury the TXLP series heating cable in advance into the middle surface layer of the concrete coating. After the power is turned on, the electrical energy can be converted into thermal energy to achieve the effect of melting snow and ice.
Taking the long descent section of the mining area in Ordos as a real engineering example, one can see the effect of snow melting with a heating cable on the slope. The continuous section of descent is 3 km long, along the path there are 3 sharp turns, and the width of the roadway is 10 meters.
For him, we supply TXLP series heating cable. The top layer of concrete is completely paved. With a little snow on the road, power can be turned on. Most snow on the concrete road on the long slope can be removed in 30 minutes after the power is turned on. Since the use of our heating cables on the long descent, no snow has previously accumulated on this section of the road, which significantly increases the safety of mountain transport.
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.