Method for treating inner surface of hydrocarbon cracking furnace tube
A hydrocarbon cracking furnace tube and a technology for cracking furnace tubes are applied in the field of treating the inner surface of a hydrocarbon cracking furnace tube, which can solve problems such as reducing deposition, and achieve the effects of improving surface roughness, maintaining anti-coking effect and lasting effect.
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Embodiment 1
[0082] A new furnace tube with the same size and material as Comparative Example 1 was used, and the furnace tube was coated according to the method of the present invention. First, the furnace tube was extruded and ground according to the method of Comparative Example 4, and then the furnace tube was treated according to the two-stage low oxygen partial pressure method. In the first stage, let the furnace tube in H 2 H with a molar ratio of 4000 to water vapor 2 -H 2 O in a low oxygen partial pressure atmosphere at 1000 °C for 10 hours; in the second stage, let the furnace tube in H 2 H with a molar ratio of 100 to water vapor 2 -H 2O in a low oxygen partial pressure atmosphere at 950°C for 30 hours. After cooling, the composition of the inner surface of the furnace tube was analyzed, and the thickness of the oxide layer on the inner surface was tested. The results are shown in Table 2.
[0083] The furnace tube was subjected to 10 cycles of cracking and coking cycle te...
Embodiment 2
[0085] A new furnace tube with the same size and material as Comparative Example 1 was used, and the furnace tube was coated according to the method of the present invention. The furnace tube was first extruded and ground according to the following conditions: (1) abrasive formula, 83% silicon carbide (400 mesh) + 17% vaseline; (2) extrusion grinding pressure, 2MPa; (3) extrusion grinding time, 500 seconds. The furnace tube was then treated according to a two-stage low oxygen partial pressure method. In the first stage, let the furnace tube in H 2 H with a molar ratio of 4000 to water vapor 2 -H 2 O in a low oxygen partial pressure atmosphere at 1050 °C for 20 hours; in the second stage, let the furnace tube in H 2 H with a molar ratio of 120 to water vapor 2 -H 2 O in a low oxygen partial pressure atmosphere (in which nitrogen accounts for 60% of the total gas volume) at 900°C for 40 hours. After cooling, the composition of the inner surface of the furnace tube was ana...
Embodiment 3
[0088] A new furnace tube with the same size and material as Comparative Example 1 was used, and the furnace tube was coated according to the method of the present invention. First, the furnace tube is extruded and ground according to the following conditions: (1) abrasive formula, 76% boron carbide (1000 mesh) + 12% paraffin + 10% oleic acid + 2% turpentine; (2) extrusion grinding pressure, 10MPa ; (3) extrusion grinding time, 15 seconds. The furnace tube was then treated according to a two-stage low oxygen partial pressure method. In the first stage, let the furnace tube in H 2 H with a molar ratio of 5000 to water vapor 2 -H 2 O in a low oxygen partial pressure atmosphere at 900 °C for 10 hours; in the second stage, let the furnace tube in H 2 H with a molar ratio of 150 to water vapor 2 -H 2 O low oxygen partial pressure atmosphere (in which helium accounts for 50% of the total gas volume) for 40 hours at 1000°C. After cooling, the composition of the inner surface o...
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Abstract
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