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Comparison of applications for steam heating, antifreeze and electric heating in thermal power plants
Electric heating is widely used in power plants as effective insulation and anti-freeze protection for sampling pipelines. In most electrical fields, the main methods of heat preservation and freezing protection are steam heating and antifreeze heating, as well as electric heating design. v
Mar 20,2023
Electric heating is widely used in power plants as effective insulation and anti-freeze protection for sampling pipelines. Its working principle is to dissipate a certain amount of heat through the heat heating medium and use direct or indirect heat exchange to make up for heat loss in the heating pipe, which has reached normal operating requirements for temperature increase, heat preservation. And antifreeze. In most electrical fields, the main methods of heat preservation and freezing protection are steam heating and antifreeze heating, as well as electric heating design.
The working principle of steam heating is to dissipate heat through the steam heating pipe to compensate for the heat loss in the insulated pipe, but its thermal energy is unstable, which refers to the unregulated heating method, the temperature fluctuates greatly, and the heating of the entire pipeline is uneven, which can lead to the possibility of evaporation of the measured medium, And this requires large energy costs.
The working principle of antifreeze is to use the lower physical properties of antifreeze refrigerators (usually ethylene glycol type) to prevent the pressure pipeline from freezing due to low temperature. The instrument sampling pipeline, which requires heating in an electric field, is relatively complex, and the laying of the heating pipeline is very inconvenient. In addition, during winter operation, “bubbles, claps, smudges and leaks” often occur in steam heating and antifreeze pipes. Thus, electric heating is used as the preferred method of heat preservation and protection against freezing of the wires of thermal appliances in thermal power plants.
The principle of electric heating is to install a heating element between the thermal insulation layer and the heated pipe and generate electric heat in addition to the heat lost during transportation and storage through the pipeline to keep the heat-heated environment within a certain temperature range.
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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.
Which electric heating should be chosen for the main pipeline transport of heavy oil
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.
Which electric heating cable should be considered for a 4 km pipeline
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.
Application of outdoor electric heating cable in oil main pipelines with high paraffin content
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.
What heating product to choose for main infusion pipelines
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 role of leather tracer cables in the insulation of asphalt main pipelines
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.
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