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PetroChina Karamay Petrochemical Company is located in Jinlong Town, Karamay City, Karamay District, Uygur Autonomous Region. The white oil hydrogenation unit is currently one of the few domestic devices that use more advanced hydrogenation methods to produce white oil products. It produces a variety of specifications. White oil is widely used in industry, cosmetics, food, medicine and other fields.
The white oil products of various brands and grades produced by Karamay Petrochemical Company have been popular in the domestic market, with high reputation and popularity and considerable economic benefits. In response to the various needs of the heat tracing project of this device, Anhui Huanrui provided a complete set of electric heat tracing solutions.
Project difficulties
1.The reaction temperature changes greatly, and the catalyst activity is easily affected.
The white oil high-pressure hydrogenation unit is a high-temperature, high-pressure hydrogenation catalytic process. After the raw materials, catalysts, and pressure are determined, temperature is the main factor affecting desulfurization, denitrification and conversion rate, and it is also the main means to control the reaction depth. For the first-stage reaction, appropriately increasing the reaction temperature can increase the desulfurization and ammonia removal rate, reduce the pollution and poisoning of the second-stage catalyst, and create conditions for the second-stage reaction. However, the reaction temperature is too high, especially when the bed temperature is too high, on the one hand, the cracking reaction of the reactants is increased, so that the low boiling point components increase, and the yield decreases; on the other hand, the bed layer is caused to accumulate coke and the pressure drop increases. The catalyst life is reduced. Therefore, during the production process, the reaction temperature needs to be kept within an appropriate range, and stable and continuous.
2. The pipeline has steam purging requirements, the highest temperature can reach 200 ℃
Steam purging is suitable for conveying power steam pipelines or thermal pipelines, purging with large flow of steam, and the flow rate is not less than 30m/s. Press steam-slowly raise the warm tube-constant temperature for 1h-purge-stop the air to cool down-reheat the pipe to increase the temperature, constant temperature, the second purge, and this repetition is generally no less than 3 times. Under long-term high temperature conditions, the electric heating cable needs to ensure normal and stable operation under high temperature conditions, and must withstand a temperature of 200°C.
Solution
In order to further confirm whether the electric heating cable can meet the reaction temperature. Before the installation, the company's engineering department cooperated with the main business unit to conduct field tests on the heat tracing performance. The heat tracing has a fast heating speed, high temperature resistance, temperature balance, and excellent performance of the sheath material. Huanrui Electric Heating provides electric heating system services for the 150,000 tons of white oil hydrogenation unit of PetroChina Karamay Petrochemical Co., Ltd., and has completed the supply of electric heating materials for 1000/2000m3 storage tanks.
In terms of temperature resistance, the engineering department, the maneuvering department and the electric repair workshop of the inspection and maintenance center have discussed and formulated this electric heat tracing temperature rise plan. Take a piece of electric heat tracing and spread the electric heat tracing on the insulation cotton in the electric repair training room. Check the maximum temperature of the electric heating and check the temperature resistance of the electric heat tracing insulation sheath. After testing, even at a high temperature of 200 ℃, the electric heating cable can work normally and stably. During the 5 and a half hours of continuous operation of the electric heating, the maximum resistance value of the three thermal resistances is 165.6Ω, corresponding to a temperature value of 170-175°, and the electric heating insulation is intact.
At present, the electric heating system has been successfully installed, and the handover and acceptance of the project has been completed. The system will be put into use before the advent of winter.
Huanrui strives for the manufacture of China and strives to warm the world, and will continue to move forward in the future, with quality as king and service first.
