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Method for reducing tar adhesion and application thereof

A tar and oleophobic technology, used in coke ovens, petroleum industry, preparation of liquid hydrocarbon mixtures, etc., can solve the problems of acid and alkali corrosion resistance, high temperature resistance, inability to know oleophobic properties, and inability to use tar condensation in high temperature environments. , to achieve the effect of strengthening the oleophobicity of the coating, enhancing the oleophobicity of the coating, and good oleophobicity

Active Publication Date: 2021-10-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the field of tar condensation collection, CN2017104673220 discloses a high-adhesion wear-resistant and temperature-resistant super-amphiphobic self-cleaning surface coating and its preparation method. The coating prepared by this method can only maintain strong oleophobic properties below 200°C , cannot be applied to the high-temperature environment where tar condenses, and only tested the oleophobic performance under a single organic compound, and cannot know the oleophobic performance under complex components and corrosive components
CN2020114719345 discloses a dynamic oleophobic siloxane self-enrichment epoxy coating and its preparation method and application. The coating consists of polysiloxane, epoxy resin, 3-aminopropyltriethoxysilane Prepared from raw materials with organic solvents, it has good thermal stability at 100°C and can resist acid and alkali corrosion, but it cannot be applied to high-temperature environments where tar condenses
CN2019103279673 discloses a solvent-resistant and corrosion-resistant superhydrophobic, oleophobic self-cleaning coating and its preparation method. It is only resistant to acid and alkali corrosion and not high temperature resistant, so it cannot be applied to high temperature environments where tar is condensed

Method used

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  • Method for reducing tar adhesion and application thereof
  • Method for reducing tar adhesion and application thereof
  • Method for reducing tar adhesion and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of double-cylinder alternating tar condensation and self-cleaning device, selects the heat exchange tube 18 mainly made of power plant steel and the outer wall of the heat exchange tube 18 is covered with NiCr alloy base oleophobic coating (the Ni of 45wt% and the Cr of 36wt% Doped with 8wt% Mo, 6wt% Fe and 5wt% Si, and using polytetrafluoroethylene-hexafluoropropylene copolymer for surface modification) for tar condensation, the front end is coupled to a reactor made of quartz as the main material For biomass pyrolysis, choose N as the carrier gas 2 , the flue gas temperature is 550°C. In actual application, the pyrolysis gas enters from the pyrolysis gas inlet 17 and flows out from the pyrolysis gas outlet 20, and the condensed working fluid enters from the condensing working fluid inlet 19 and flows out from the condensing working fluid outlet 15, completing the tar condensation work. After multiple pyrolysis, the NiCr alloy coating can reduce the tar adhesio...

Embodiment 2

[0039] A double-cylinder alternating tar condensation and self-cleaning device selects heat exchange tubes 18 made of power plant steel as the main material and the outer wall of the heat exchange tubes 18 is covered with a NiCr alloy-based oleophobic coating (85wt% Ni and 8.99wt% Ni Cr is doped with 0.01wt% Mo, 4wt% Fe and 2wt% Si, and the surface is modified by polytetrafluoroethylene-hexafluoropropylene copolymer) for tar condensation, and the front-end coupling is mainly made of quartz The reactor is used for biomass pyrolysis, and the carrier gas is N 2 , the flue gas temperature is 500°C. In actual application, the pyrolysis gas enters from the pyrolysis gas inlet 17 and flows out from the pyrolysis gas outlet 20, and the condensed working fluid enters from the condensing working fluid inlet 19 and flows out from the condensing working fluid outlet 15, completing the tar condensation work. After repeated pyrolysis, the NiCr alloy coating can reduce the tar adhesion rate...

Embodiment 3

[0041] A double-cylinder alternate tar condensation and self-cleaning device, selects heat exchange tubes 18 made of power plant steel and the outer wall of the heat exchange tubes 18 is covered with a NiCr alloy-based oleophobic coating (65wt% Ni and 18wt% Cr Doped with 4wt% Mo, 10wt% Fe and 3wt% Si, and using polytetrafluoroethylene-hexafluoropropylene copolymer for surface modification) for tar condensation, the front end is coupled to a reactor made of quartz as the main material For biomass pyrolysis, choose N as the carrier gas 2, the flue gas temperature is 500°C. In actual application, the pyrolysis gas enters from the pyrolysis gas inlet 17 and flows out from the pyrolysis gas outlet 20, and the condensed working fluid enters from the condensing working fluid inlet 19 and flows out from the condensing working fluid outlet 15, completing the tar condensation work. After multiple pyrolysis, the NiCr alloy coating can reduce the tar adhesion rate up to 60%. To clean th...

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Abstract

The invention belongs to the field of tar collection, and particularly discloses a method for reducing tar adhesion and application thereof. The method specifically comprises the following steps: when the temperature of flue gas is below 300 DEG C, coating the outer side of a pipeline with a nano organic composite oleophobic coating; when the temperature of the flue gas is 300-400 DEG C, coating the outer side of the pipeline with a metal oxide oleophobic coating; when the temperature of the flue gas is 400-450 DEG C, coating the outer side of the pipeline with a SiO2 oleophobic coating; and when the temperature of the flue gas is 450 DEG C or above, coating the outer side of the pipeline with a NiCr alloy oleophobic coating. According to the invention, large differences of dew point temperatures, viscosities and acid corrosivity of different components of tar are considered, and different types of coatings are selected for protection according to different flue gas temperatures, so that multifunctional and multi-environment application is realized.

Description

technical field [0001] The invention belongs to the field of tar collection, and more specifically relates to a method for reducing tar adhesion and application thereof. Background technique [0002] Pyrolysis is an ideal technology for the utilization of solid fuels. When solid fuels (including coal, biomass, sludge, and solid waste) are pyrolyzed under anaerobic / anoxic conditions, solid, liquid, and gaseous three-state products will be generated. Among them, the condenser is the key equipment for collecting liquid phase products in the solid fuel pyrolysis process, and the shell-and-tube condenser is the most widely used. Liquid phase products, such as tar, are rapidly cooled in the condenser, and will partially adhere to the outer wall of the heat exchange tube of the condenser, combining with ash and carbon particles to form blockages such as tar residue, which seriously affects the heat exchange efficiency and the tar residue enters the subsequent process Can cause pip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/00C10B53/00C10B53/02C10G1/02C09D163/00C09D7/61C09D7/65C09D1/00C09D7/62C09D181/02
CPCC10B57/00C10B53/00C10B53/02C10G1/02C09D163/00C09D7/61C09D7/65C09D1/00C09D7/62C09D181/02C09D7/70C08L2205/03C08K2201/011C08L33/26C08L79/02C08K3/041C08K7/26Y02E50/10
Inventor 刘欢吴扬威易琳琳姚洪
Owner HUAZHONG UNIV OF SCI & TECH
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