Ethylene furnace tube surface coating preparation method

Abstract

A way of making the coat of ethene stove's pipe. Put the dry co-infiltration menstruum into the co-infiltration equipment, embed the processed workpiece into co-infiltration menstruum, then seal up the exit of the equipment and heat up the workpiece in the equipment to the temperature around 500-1400 degree. The speed of heating is 10-200 degree per hour. Keep the temperature about 5-40 hours, and then refrigerate it. The whole process is protected by the environment of argon. This approach improves the stove pipe's capability of controlling scorching. The coat and the pipe's wall could combine well, hard to shed and do not damnify the intrinsic mechanical performance. The cost is low, the process is easy to operate and it could reduce the more than 50% scorching due to the high temperature.

Description

technical field [0001] The invention relates to the surface coating of metal materials, more specifically, a method for preparing the coating on the surface of ethylene furnace tubes. Background technique [0002] With the rapid development of my country's economy, the demand for ethylene and other low-grade olefins has increased significantly. During the "Tenth Five-Year Plan" period, it is planned to increase the production capacity of about 4.05 million tons of ethylene, and the total capacity will reach about 9 million tons per year. In terms of demand, it is predicted that the demand for ethylene will reach 15 million tons by 2005, an increase of 40%. The annual growth rate of demand for ethylene will reach 8.5% higher than the growth of GDP. At that time, the production capacity of ethylene can only meet 60% of the demand. In 2005, the production capacity of propylene will reach nearly 7 million tons, which is expected to only meet 65% of the ...

AI Technical Summary

Problems solved by technology

[0011] The above-mentioned prior art is applied to the steam cracking process. Although the ethylene production cycle is extended to a certain extent and the yield of the target product is improved, the osmotic agent cannot be reused in the preparation process, and the waste is large, and the osmotic agent is easily oxidized.

Moreover, the heat treatment equipment used in the process is strictly required, and the cost and energy consumption are relatively large;

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