Evaluation method of oil-soluble scale inhibitor and tester

Abstract

The invention provides an evaluation method of an oil-soluble scale inhibitor, comprising the steps of: firstly pre-heating a test raw material and keeping the temperature at a constant value; leading the test raw material to pass through an annular space between an electric heating bar and a scale test tube at a relatively low flow speed, heating up and scaling; adjusting and stabilizing the temperature of the scale test tube by means of temperature cascade control of the electric heating bar and the scale test tube outlet; adjusting and maintaining the pressure of a scale generating part by a constant pressure valve; finally performing cycle test for the flow of returning to the original pot after being cooled, wherein the scale deposition amounts at beginning and end of blank test and agent added test are used as the evaluation standard. The method has the characteristics of easy implementation, small process parameter fluctuation, strong practicability to test raw materials, good simulation of real use working conditions of oil-soluble scale inhibitor, accurate evaluation result, and safe and reliable test procedure. Simultaneously, the flow of the tester is simplified, the volume of the tester is reduced, the constant process parameters are ensured during the evaluation procedure, and the adaptability of the tester to different raw materials is widened.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and mainly relates to a dynamic evaluation method and a test device for the performance of an oil-soluble scale inhibitor. Background technique [0002] Scale inhibitors, also known as antiscalants, antiscalants, and antiscorch agents, are a type of chemical additives commonly used in the petrochemical industry to inhibit and slow down the scaling tendency in processing equipment and prolong the smooth operation period of equipment. [0003] The petrochemical process is a continuous large-scale production process, and long-term operation has become one of the important indicators to measure its technical level. Due to the high temperature in the processing process, and the processing medium contains some impurities and coking precursors, these substances will gradually accumulate or deposit in parts with high temperature and low flow rate, causing scaling of equipment, affecting he...

AI Technical Summary

Problems solved by technology

This method can better simulate the flow state of materials under actual working conditions, but it has two obvious defects: one is that the evaluation process is under normal pressure, which is only suitable for high boiling point media such as catalytic oil slurry, and has poor adaptability; The second is that the beginning and end of the test are the stages with the largest temperature fluctuations. Taking the temperature difference between the inlet and outlet of the fouling test tube as the evaluation standard at this time, it is difficult to guarantee the accuracy of the test data.

Its shortcomings: first, the dirt is distributed in the dirt generation pipe and the dirt collection pipe, which makes the test process complicated; second, the screen is set in the dirt generation pipe, which is easy to cause system blockage, so it is not suitable for testing asphaltenes and Medium with high colloid content (such as atmospheric residue, vacuum residue, etc.), and the dirt obtained by filtering through the screen is very different from the scale deposited on the wall of industrial equipment; the third is the test process The medium circulating between the dirt generation pipe and the dirt collection pipe is only the part stored between the two, and it is impossible to replenish new medium from the raw material tank. The effective circulation of the medium is small, and for some media with low boiling point or low coking tendency , the amount of dirt generated is too small, which affects the accuracy of the results; fourth, the invention does not have special pressure regulating facilities, and it is difficult to maintain a stable system pressure; The test temperature has a greater influence

However, this method uses the capillary as the main body of the flow and fouling of the sample, which has great disadvantages.

The adsorption effect of the capillary is very strong. If the sample is an organic medium, the organic matter adsorbed on the capillary wall is difficult to desorb, and will quickly polymerize and scale in the high-temperature test environment, blocking the capillary; is also very difficult; therefore, the method is not suitable for testing the fouling tendency of highly viscous media and organic media at high temperatures

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