A method for measuring critical thermal cracking temperature of heavy oil in heating furnace tube
A method of determination, heavy oil technology, applied in the direction of weighing by removing certain components, to achieve the effect of simple test process, less raw material consumption and good test repeatability
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Embodiment 1
[0031] A typical heavy crude oil (Venezuelan crude oil) was selected as the test oil sample in Example 1, and the room temperature was raised to 600° C., and nitrogen (pressure 0.1 MPa) was used for full protection during the heating and cooling process. Under the condition of 15K / min linear temperature rise, the weight loss trend of the sample is obtained, and the results are as follows figure 2 shown.
[0032] The obtained weight loss trend curve was divided into peaks using origin software, and four sub-peaks were obtained, namely sub-peaks 1, 2, 3, and 4. The correlation R between the sub-peak wrapping curve and the actual curve is 0.9999, which shows that the peak division method is appropriate.
[0033] The activation energies of the thermal processes corresponding to the four peaks were calculated respectively. Calculation preferred Achar-Brindley-Sharp-Wendworth method,
[0034] Such as figure 1 As shown, the conversion rate α of the weight loss process is defined...
Embodiment 2
[0043] Select the residual oil (atmospheric residual oil) obtained from atmospheric distillation in Venezuela with a boiling point higher than 350°C as the test oil sample, raise the room temperature to 600°C, and protect the whole process with nitrogen (pressure 0.1MPa) during the heating and cooling process, 15K / min linear Under the condition of rising temperature, obtain the weight loss trend of the sample, the result is as follows image 3 shown.
[0044] The obtained weight loss trend curve was divided into peaks using origin software, and two sub-peaks were obtained, which were sub-peaks 1 and 2 respectively. The correlation R between the wrapping curve of the sub-peak and the actual curve is 0.9828, which shows that the peak division method is basically appropriate.
[0045] The activation energies of the thermal processes corresponding to the two peaks were calculated respectively, and the calculation process was as in Example 1.
[0046] The calculation results are ...
Embodiment 3
[0049] Select the residual oil (vacuum residual oil) obtained from vacuum distillation in Venezuela with a boiling point higher than 420°C as the test oil sample, raise the room temperature to 600°C, and protect the whole process with nitrogen (pressure 0.1MPa) during the heating and cooling process, 15K / min linear Under the condition of rising temperature, obtain the weight loss trend of the sample, the result is as follows Figure 4 shown.
[0050] The obtained weight loss trend curve was divided into peaks using origin software, and two sub-peaks were obtained, which were sub-peaks 1 and 2 respectively. The correlation R between the wrapping curve of the sub-peak and the actual curve is 0.9943, which shows that the method of splitting the peak is appropriate.
[0051] The activation energies of the thermal processes corresponding to the two peaks were calculated respectively, and the calculation process was as in Example 1.
[0052] The calculation results are shown in Ta...
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