A coke cleaning method using ozone mixed gas

A technology of mixing gas and ozone, which is used in cracking, petroleum industry, non-catalytic thermal cracking and other directions to achieve the effect of reducing energy consumption, low coke cleaning temperature and low energy consumption

Active Publication Date: 2019-09-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art reports mainly use ozone to treat wastewater, but the application of ozone in coke cleaning has not been reported yet.

Method used

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  • A coke cleaning method using ozone mixed gas
  • A coke cleaning method using ozone mixed gas
  • A coke cleaning method using ozone mixed gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] use figure 1 The device shown uses ozone mixed gas for decoking. Specific steps are as follows:

[0034] A. According to figure 1 Connect the pipeline and put the device with coke on the inner wall into the muffle furnace;

[0035] B. Raise the muffle furnace to the specified temperature of 160°C and keep the temperature constant;

[0036] C. Open N 2 Bottle valve and mass flow meter, regulating N 2 flow makes N 2 The molar percentage that accounts for described ozone mixed gas is 22%;

[0037] D. open O 2 Bottle valve and mass flow meter, regulating O 2 Flow makes O 2 Accounting for the molar percentage of the ozone mixed gas is about 74%;

[0038] E. Open O 3 generator power supply, the O 3 Generate concentration adjusted to 100%;

[0039] F. Open O 3 Concentration detector, monitoring makes O 3 The concentration is 80mg / l;

[0040] G. Open the ozone decomposer, unreacted O 3 break down;

[0041] H. Turn on the infrared detector to monitor the genera...

Embodiment 2

[0045] Among them, the muffle furnace is raised to the specified temperature of 220 ° C and kept at a constant temperature, O 3 The concentration is 60mg / l, N 2 Accounting for the mol percent of the ozone mixed gas is about 26%, O 2 Accounting for the mole percentage of the ozone mixed gas is 71%.

[0046] Other conditions are with embodiment 1. It takes about 60 minutes to complete the coke cleaning. After the coke cleaning is completed, the appearance of the inner wall of the device is as follows: image 3 shown. Depend on image 3 It can be seen that the coke on the inner wall of the device is relatively clean, and the inner wall of the device has a smooth surface and a high degree of integrity.

[0047]The device after decoking in this embodiment is used to continue the oil refining catalytic reaction, and then use the conditions of this embodiment to perform decoking. After repeating this 10 times, the surface of the inner wall of the device is still intact.

Embodiment 3

[0049] Among them, the muffle furnace is raised to the specified temperature of 200 ° C and kept at a constant temperature, O 3 The concentration is 74mg / l, N 2 Accounting for the mol percent of the ozone mixed gas is about 10%, O 2 The mole percentage of the ozone mixed gas is about 86%.

[0050] Other conditions are with embodiment 1. It takes about 50 minutes to complete the coke cleaning. After the coke cleaning is completed, the appearance of the inner wall of the device is as follows: Figure 4 shown. Depend on Figure 4 It can be seen that the coke on the inner wall of the device is relatively clean, and the inner wall of the device has a smooth surface and a high degree of integrity.

[0051] The device after decoking in this embodiment is used to continue the oil refining catalytic reaction, and then use the conditions of this embodiment to perform decoking. After repeating this 10 times, the surface of the inner wall of the device is still intact.

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Abstract

The invention discloses a decoking method adopting ozone mixed gas. The ozone content in the ozone mixed gas is 60-80 mg / L, the molar percentage of N2 accounting for the ozone mixture gas is 10-30%, and the decoking temperature is 160-220 DEG C. The method has remarkable decoking efficiency and does not cause damage to a catalytic device.

Description

technical field [0001] The invention belongs to the field of maintenance operation of tubular heating furnaces in the petrochemical industry, and in particular relates to a coke cleaning method using ozone mixed gas as a coke cleaning agent. Background technique [0002] The catalytic device is a secondary processing device for oil refining. It uses heavy distillate oil such as straight-run wax oil, coker wax oil, atmospheric heavy oil, vacuum residue, deasphalted oil, etc. as raw materials. The molecular sieve catalyst is used as the carrier, and the fluidization technology is adopted. The raw material oil is in contact with the high-temperature catalyst, and a series of chemical reactions occur, thereby converting the raw material into a production and processing process of light oil. In recent decades, due to the increasing demand for oil worldwide, a large number of mining has led to an increase in the difficulty of mining and a decline in the quality of crude oil, makin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/16
Inventor 张香文刘国柱王庆法刘洁
Owner TIANJIN UNIV
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