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Method for reducing coking of cracking device

A cracking device and cracking furnace technology, applied in cracking, non-catalytic thermal cracking, petroleum industry, etc., can solve the problems of complex operation, toxic raw materials, etc., achieve the effects of inhibiting coking, convenient operation, and prolonging the operation cycle

Inactive Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the problems of toxic raw materials used in the prior art and complicated operation during use, the present invention provides a method for reducing coking in cracking units

Method used

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  • Method for reducing coking of cracking device

Examples

Experimental program
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Effect test

Embodiment 1

[0035]The cracking furnace tube was heat treated on the 200g / h laboratory ethylene cracking evaluation device. The furnace tube is made of 0Cr25Ni20 stainless steel. In the heat preparation stage, under normal pressure, 100g / h of 600°C water vapor carries 100ppm of silicon-containing organic compounds (tetraethoxysilane) and polysulfide organic compounds (di-tert-butyl polysulfide) into the cracking furnace , where the molar ratio of Si to S is 3:1, heat treatment at 750°C for 2h. After the experiment, the cracking furnace tube was evacuated by introducing nitrogen gas, and then the cracking furnace tube was rapidly heated to 860°C for the cracking experiment. Ethane feed 100g / h, water feed 30g / h, residence time 0.4s, cracking time 2h. After the end of the cracking experiment, evacuate with nitrogen, and use N 2 and O 2 The mixed gas is burned, and the CO and CO in the burnt gas are measured online with an infrared analyzer 2 Concentration, record the volume of charred ga...

reference example 1

[0037] In this reference example, no treatment was done to the furnace tube, and the pyrolysis was carried out according to the method in Example 1, and the amount of coking during the pyrolysis operation was tested. The amount of coke obtained is shown in Table 1.

Embodiment 2

[0041] The furnace tube is treated with reference to the method of Example 1, the difference is that 100 g / h of 600 ° C steam carries 300 ppm of silicon-containing organic compounds (tetraethoxysilane) and polysulfur organic compounds (di-tert-butyl polysulfide) thing), the rest are the same as in Example 1. The amount of coke obtained is shown in Table 1.

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Abstract

The invention relates to the field of furnace tube coking, in particular to a method for reducing coking of a cracking device. The method comprises the following step: during a hot standby period, treatment gas containing a silicon-containing organic compound, a polysulfide organic compound and carrier gas is introduced into a cracking device for heat treatment under a heat treatment condition. The general formula of the polysulfide organic compound is R1-Sn-R2, wherein n is an integer from 3 to 5, R1 and R2 are independently selected from hydrogen or alkyl with the carbon atom number being 1to 24, and R1 and R2 are not hydrogen at the same time. The raw materials used in the method are small in smell and convenient to operate in use, the coking phenomenon on the surface of the cracking device can be effectively inhibited, and the operation period of the cracking device is prolonged.

Description

technical field [0001] The invention relates to the field of coking of furnace tubes, in particular to a method for reducing coking of cracking devices. Background technique [0002] A prominent problem in the process of hydrocarbon cracking to produce ethylene is coking on the inner wall of the cracking furnace tube and carburization of the metal matrix. Coking will increase the thermal resistance of the furnace tube wall of the cracking furnace, reduce the heat transfer coefficient, cause the wall temperature to rise, and cause local overheating, shortening the life of the furnace tube. When the coke layer reaches a certain thickness, regular decoking is required. Frequent decoking not only reduces the output, but also affects the life of the furnace tube. In addition, the carbon deposited on the surface of the furnace tube will diffuse into the metal matrix to form carbides, which will increase the brittleness of the material and cause metal powdering. These carburizing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/16
CPCC10G9/16
Inventor 郏景省王红霞王申祥王国清张利军
Owner CHINA PETROLEUM & CHEM CORP
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