Discussion of the choice of the type of electric heating at the site of a gas well of a coal reservoir
my country is rich in methane from coal seams. According to the assessment of coal seam methane resources, the geological resources of the methane of shallow coal seams below 2,000 m in my country are about 36 trillion cubic meters, mainly distributed in North China and Northwest China. Temperatures in northwest China are too low in winter, and pipelines of coal-bed methane plants are prone to freezing and blockage.
In order to ensure the safety of the plant's installations and equipment during the winter, the coal seam methane plant uses electric heating cables on the surface of the steam water pipelines for heating, and to ensure normal operation in the winter, thermal insulation wool is used on the side to prevent the pipelines from freezing. Electric heating is currently an effective method of maintaining the technological temperature in station facilities and collection pipelines. Electric heating has the characteristics of high thermal efficiency, energy saving, simple structure, convenient construction and installation, no pollution and long service life.
Electric heating cables mainly include high-power electric heating cables and self-limiting temperature heating cables Currently, self-limiting temperature heating cables are used in coal bed methane mining plants. The constant power electric heating tape is made of resistance metal wire or a special beam of carbon fibers connected in series or in parallel with the conductive core and insulating material.
The electric heating cable consists of nanoconductive carbon particles and two parallel tires plus an insulating layer. With this parallel structure, all self-regulating heating cables can be cut into any length in place and connected by double-sided or three-sided junction boxes. In each heating cable, the number of circuits between the tires varies with temperature. When the temperature around the heating cable becomes low, the conductive plastic compresses the micromolecules and connects the carbon particles to form a circuit. The current passes through these tires. Heat the heating cable. The temperature of the self-regulating electric heating belt is uniform, it does not overheat, saves electricity, heats up quickly, allows repeated overlapping without exceeding temperature points.
The electric heating system is very important for the safe mining of methane wells from coal seams in the winter, so the choice of electric heating cable should consult professionals in detail and find experienced manufacturers.
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.