Device for inhibiting coking of hydrocarbon-like steam cracking device and quenching boiler

A cracking device and quenching boiler technology, applied in cracking, non-catalytic thermal cracking, petroleum industry, etc., can solve the problems of polluting downstream products, cumbersome operating conditions, and industrial impossibility, etc., to achieve extended operating cycle, simple operation, and efficient operation method simple and easy effects

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Disclosed in US 4297246A is to provide a coating on the metal substrate to suppress the deposition of carbon layers on the metal surface exposed to the air flow, using a high concentration of CeO 2 , SiO 2 , ZrO 2 Such as sol to process the metal samples in the laboratory by dipping, but if high-concentration sol is used in the cracking furnace, it will affect the downstream system and even pollute the downstream products; in addition, the method disclosed in US 4297246A has many procedures and operating conditions Complicated, not only high cost, complicated technology, difficult to master, but also impossible to achieve in industry
This technology does not provide a method for applying the above-mentioned sol to the treatment of pyrolysis furnace tubes

Method used

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  • Device for inhibiting coking of hydrocarbon-like steam cracking device and quenching boiler
  • Device for inhibiting coking of hydrocarbon-like steam cracking device and quenching boiler
  • Device for inhibiting coking of hydrocarbon-like steam cracking device and quenching boiler

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1 and embodiment 2 are the method that industrial cracking furnace is processed.

[0039] Example 1

[0040] SiO 2 The mass concentration is 20%, and the neutral silica sol that pH is 6.5~7.5 is diluted with water to be pure oxide mass concentration and is the silica sol aqueous solution of 1.0%. ~850°C, under the operating pressure of 0.4Mpa, inject the diluted silica sol aqueous solution into the cracking furnace from the convection section of the cracking furnace under the accompaniment of carrier gas water vapor. The sol aqueous solution accounts for 18wt% of the total weight of the carrier gas. The injection time is 3 hours; Then, during the oiling operation of the cracking furnace, n-butanethiol is continuously injected into the cracking furnace from the convection section of the cracking furnace under the companionship of the carrier gas steam, and the n-butylmercaptan accounts for the total weight of the carrier gas 16wt%, the weight ratio of carri...

Embodiment 2

[0042] Set the solid content to 20%, SiO 2 / Al 2 o 3 =8, PH is that the aluminum silicate sol of 3~4 is diluted with water to be the SiO that pure oxide mass concentration is 2.0% 2 -Al 2 o 3 Aqueous sol solution, in which SiO 2 : Al 2 o 3 =8: 1 (molar ratio), during the thermal preparation after the cracking furnace burnt, the outlet temperature of the cracking furnace is 700~850 ℃, under the operating pressure of 0.3Mpa, the diluted SiO 2 -Al 2 o 3 The sol aqueous solution is injected into the cracking furnace from the spanning section of the cracking furnace under the companionship of the carrier gas water vapor. The sol aqueous solution accounts for 10wt% of the carrier gas gross weight, and the injection time is 2 hours; Phosphorus compound tributyl phosphate trithioester (wherein the atomic molar ratio of sulfur element to phosphorus element is S:P=3:1), accompanied by carrier gas and water vapor, is continuously injected from the spanning section of the crackin...

Embodiment 3

[0047] To simulate the SRT-III cracking furnace, when the outlet temperature of the cracking furnace is 800°C, the TiO 2 TiO with a mass concentration of 30% 2 The sol was diluted with water to obtain TiO with a mass concentration of 0.5% pure oxide 2 The sol aqueous solution is injected into the cracking furnace from the spanning section of the cracking furnace for pretreatment, the treatment time is 1 hour, and the injection rate is 200g / h; then, naphtha cracking is carried out when the outlet temperature of the cracking furnace is 840°C. The physical properties of raw naphtha are: distillation range 48-211°C, specific gravity D 15.6 0.7287, sulfur content 165PPM; cracking conditions: cracking temperature 840°C, feed oil 800g / h, water 400g / h, residence time 0.37 seconds, water-oil ratio 0.5, reaction time 6 hours. The amount of coking in the simulated cracking furnace is 3.49g, which is 30% less than that of the untreated furnace tube.

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Abstract

The invention relates to a device for inhibition to the hydrocarbon steam cracking, and a method for quenching boiler coking, wherein, the method comprises the following steps that pretreatment is performed to the hydrocarbon steam cracking device with sol composition during the heating preparation period of a cracking furnace, and the liquid-state coking inhibitor is injected into the cracking furnace uninterruptedly during the flushing running period of the cracking furnace. Through the pretreatment to the hydrocarbon steam cracking device and the method of uninterrupted injection of the coking inhibitor, not only the catalyzed coking effect of the cracking furnace tube metal can be inhibited, but also the carburization and the performance degradation of the cracking furnace tube metal can be inhibited. The invention has the advantages that the method is simple and feasible, the cost is low, the influence to the downstream systems of an ethylene plant cannot caused, simultaneously the coking of the cracking furnace can be effectively inhibited, thereby the service life and the running cycle of the cracking furnace are prolonged.

Description

technical field [0001] The invention relates to a method for suppressing coking of a hydrocarbon steam cracking device and a quenching boiler. Background technique [0002] In the pyrolysis ethylene production plant, the cracking furnace is the most critical core equipment, and about 60% of the energy consumption of ethylene production is consumed in the cracking furnace. The cracking furnace tube is the component with the highest operating temperature in the ethylene plant. The cracking reaction of hydrocarbons is carried out in the furnace tube. Due to the secondary reactions such as polymerization and condensation, it is inevitable to generate coke scale on the inner wall of the cracking furnace tube and the inner wall of the quenching boiler tube. . Coking increases the thermal resistance of the tube wall, reduces the heat transfer coefficient, increases the wall temperature and causes local overheating, shortens the service life of the furnace tube; decrease, the yiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/16
Inventor 陈硕王红霞杜志国杨元一
Owner CHINA PETROLEUM & CHEM CORP
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