Method and device for accurate testing of petroleum products questionable points

Abstract

This invention relates to one oil product inclination point accurate test method and its device without other type, which comprises temperature control oil tar and constant ring tube path through micro meter pump to form recycle oil sample tube, wherein, the recycle tube uses multiple parallel branch connected to relative closed sample container; it heats the oil tar into 50+-1DEG C for recycle in tube to observe whether there is flow; If the flow temperature is lowered to second observe point, keeping it constant to observe second container till certain observe point sample not move.

Description

technical field [0001] The invention relates to a precise testing method and device for testing the freezing point of petroleum products, and relates to the technical fields of testing and petroleum industry not included in other categories. Background technique [0002] The freezing point of petroleum products is a very important technical index in the physical property testing of oil products. It indicates the maximum temperature of petroleum products when they are cooled to the point where the liquid surface does not move under the test conditions. For crude oil, the freezing point determines the necessary entry temperature during pipeline transportation, which also determines the transportation process used by the entire pipeline, and the allowable stoppage time once the transportation is stopped, which is the process of pipeline design and operation. It is a parameter that must be considered mainly; for refined oil, especially diesel oil, it determines the ambient tempe...

AI Technical Summary

Problems solved by technology

[0003] Whether it is a national standard or an industry standard, there are great defects: for the industry standard, it is unscientific to continue the cooling test after tilting, because the movement of the liquid surface destroys the structure formed by the crude oil at low temperature, and the re-test is impossible to be accurate. And it is difficult to avoid vibration or temperature changes during the movement without affecting the structure formed by crude oil at low temperature

As far as the national standard is concerned, although it stipulates that once the liquid level moves, it should be reheated to 50±1°C, which eliminates the influence of structural damage, but such a complicated operation procedure is time-consuming and laborious, and will be lost under non-airtight conditions with repeated heating. Cause light components to volatilize and affect test results

In addition, since both of them use circular test tubes, it is difficult to ensure that the center temperature of the oil sample is consistent with the edge at a faster cooling rate, and it is difficult to ensure that the liquid surface of the oil sample is smooth, which brings inconvenience to the observation of liquid surface movement

In this way, the final freezing point test results are difficult to achieve high accuracy and precision

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