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Method for restraining cracking furnace pipe from coking

A technology for cracking furnace tubes and furnace tubes, applied in cracking, non-catalytic thermal cracking, petroleum industry, etc., can solve problems such as furnace tube metal corrosion, olefin product pollution, corrosive pollution, etc., to improve thermophysical properties, prolong The effect of production cycle and service life extension

Active Publication Date: 2013-12-04
内蒙古冠泰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coking inhibitor may cause corrosion to the metal of the furnace tube and pollute the downstream olefin products, and judging from the application of coking inhibitors at home and abroad in industrial devices, it is more suitable for ethane and other light components with a single component. Hydrocarbon raw materials, for domestic cracking raw materials dominated by naphtha, coking inhibitors do not prolong the operation cycle of cracking furnaces much, coupled with their own shortcomings of corrosiveness and pollution, so far there is no large-scale industrial application of coking inhibitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0025] The cracking tube is HK40 tube, the raw material for cracking is naphtha, and the cracking product is ethylene.

[0026] The method for reducing coking of cracking furnace tubes includes the following steps:

[0027] (1) Before coating the scorch suppression coating on the inner surface of the cracking furnace tube, pre-treat the inner surface of the cracking furnace tube at 3 atmospheres: the pre-oxidation temperature is 800 ℃, the treatment is 6 hours, and the pre-oxidation atmosphere is water vapor, A mixture of carbon dioxide, CH4 and hydrogen, the molar ratio is water vapor: carbon dioxide: CH 4 : Hydrogen = 2:25:35:20.

[0028] (2) Coating the anti-coking coating on the inner surface of the cracking furnace tube, preheat the cracking equipment to a temperature of 900 ℃ under 3 atmospheres, using water vapor as the carrier gas, the flow rate of water vapor is 850g / h, and adding Sijia The molar ratio of base silane and hydrogen sulfide, Si and S is 7:2. The concentration...

Embodiment 2

[0032] The cracking tube is HP40, the raw material for cracking is naphtha, and the cracking product is ethylene.

[0033] The method for reducing coking of cracking furnace tubes includes the following steps:

[0034] (1) Before coating the scorch suppression coating on the inner surface of the cracking furnace tube, pre-treat the inner surface of the cracking furnace tube at 2 atmospheres: the pre-oxidation temperature is 780℃, the treatment is 5 hours, and the pre-oxidation atmosphere is water vapor, A mixture of carbon dioxide, CH4 and hydrogen, the molar ratio is water vapor: carbon monoxide: C 2 H 6 = 2:40:35.

[0035] (2) Apply anti-coking coating on the inner surface of the cracking furnace tube, preheat the cracking equipment to 1000℃ under 2 atmospheres, use water vapor as the carrier gas, the flow rate of water vapor is 900g / h, and then add silane A mixture of chlorosilane and sulfur, in which the molar ratio of Si and S is 7:2, the concentration of the mixture in water v...

Embodiment 3

[0039] The cracking tube is HK40 tube, the raw material for cracking is naphtha, and the cracking product is ethylene.

[0040] The method for reducing coking of cracking furnace tubes includes the following steps:

[0041] (1) Before coating the scorch suppression coating on the inner surface of the cracking furnace tube, pre-treat the inner surface of the cracking furnace tube at 1 atmosphere: the pre-oxidation temperature is 760℃, the treatment is 4 hours, and the pre-oxidation atmosphere is CH 4 And hydrogen, the molar ratio is CH 4 : Hydrogen = 45:14.

[0042] (2) Coat the anti-coking coating on the inner surface of the cracking furnace tube, preheat the cracking equipment to a temperature of 800 ℃ under 1 atmosphere pressure, use water vapor as the carrier gas, the flow rate of water vapor is 870g / h, and then add silane And hydrogen sulfide, the molar ratio of Si and S is 7:4, and the concentration of the mixture in water vapor is 3500ppm. A composite coating of silica and sulf...

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Abstract

The invention provides a method for restraining a cracking furnace pipe from coking. The method comprises the following steps: pre-treating the inner surface of the cracking furnace pipe before a coking restraining coating of the inner surface of the cracking furnace pipe is coated; coating a coking resistant coating on the inner surface of the cracking furnace pipe; adding a coking inhibitor into cracking raw materials. According to the invention, the coke formation is reduced through the recombination of the coking resistant technology, so that the hydrocarbon high-temperature cracking coking rate is greatly reduced, and the use cycle of hydrocarbon cracking equipment is prolonged.

Description

technical field [0001] The invention relates to the technical field of suppressing coking of hydrocarbon cracking furnace tubes, in particular to a method for reducing coking of cracking furnace tubes. Background technique [0002] The current method of producing short-chain olefins is mainly realized by high-temperature thermal cracking of hydrocarbons. The high-temperature thermal cracking process of hydrocarbons has complicated reactions. During the decomposition process of cracking raw materials, intermediate free radicals will undergo polycondensation reaction and dehydrogenation reaction, which will make the cracked products move to the direction of coke formation. That is the so-called secondary reaction, so it is inevitable to coke on the inner wall of the cracking furnace tube and the inner wall of the quenching boiler tube. Coking will increase the thermal resistance of the furnace tube, reduce the heat transfer coefficient, increase the wall temperature, increase...

Claims

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Application Information

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IPC IPC(8): C10G9/20
Inventor 张成如
Owner 内蒙古冠泰环保科技有限公司
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