Why choose electric heating for gasifier flocculant preparation station
The gasifier plays a vital role in the process of methanol production, and the flocculant preparation station is the main link in the gasifier wastewater treatment, so the reliable operation of the flocculant preparation station is particularly important.
Maintaining the temperature of the flocculant preparation station pipeline is a relatively important issue in the production process. When the ambient temperature decreases when the excitation occurs, the flow rate in the pipeline will decrease and affect the performance of the process. The gasifier is stopped for maintenance in the winter, the environment can be solidified, a blockage or even a breakdown of the pipeline can also occur. Therefore, it is extremely important to isolate the environment in the pipeline.
For most of the heating of the gas generator pipelines of the company's coal chemical branch in Heilongjiang Province, steam heating is used. Electric heating should use electrical thermal energy to supplement the heat lost by the heating body in the process to maintain the most reasonable process temperature of the flow medium. The electric heating is designed to evenly release heat along the length of the pipeline, and the heating temperature is maintained for a long time, which is suitable for long-term use. Thus, other pipelines of the gasification rate flocculant preparation station use electric heating.
Compared with steam heating, electric heating has the following advantages:
The electric heating device is simple, with uniform heating and precise temperature control. Can realize automatic control.
Explosion-proof area has explosion-proof, all-weather operation, high reliability and long service life.
Electric heating has no leaks, which is useful for environmental protection.
Installation of electric heating does not require additional insulating materials, which saves thermal insulation materials.
There is no need for a lot of steam, which saves a lot of water.
Electric heating solves problems that are difficult to solve with steam, such as tees and pressure pipelines, etc. D. The design working load of the electric heating is small, the design is convenient, and the maintenance volume is small.
High efficiency, can significantly reduce energy consumption.
As a result, the company opted for a self-regulating electric heating belt. The electric heating element of the self-regulating electric heating belt is a belt core made of a layer of PTC material uniformly extruded between two parallel metal tires. When two buses are connected to a power supply, current flows horizontally from one bus through a layer of PTC material to the other bus. The PTC layer is an electric heating element connected parallel to the bus, which converts electrical energy into thermal energy. And accompanies the thermal insulation operating system. The resistance of the baseband increases as the temperature rises. In the high resistance region, the resistance almost blocks the current, and the temperature of the baseband reaches the upper limit and no longer rises, but the temperature is automatically limited. The output power of the electric heating belt is mainly controlled by the heat transfer process and the temperature of the heated system.
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.