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A kind of graphite material for heat exchanger and preparation method thereof

A technology for heat exchangers and graphite materials, applied in the field of graphite materials for high-density, high-strength heat exchangers and its preparation, can solve problems such as insufficient structure, unsatisfactory requirements, and insufficient strength, so as to facilitate fluency and reduce Effect of porosity and strength improvement

Active Publication Date: 2020-01-10
HUNAN CHANGYU NEW CARBON MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when heat exchangers are processing small-diameter pipes that are very close to each other, many graphite blocks are not strong enough and the structure is not delicate enough, resulting in chipping and extrusion between the two pipes during the processing process, so that the two pipes are connected. Cause processing failure; at the same time, the thermal conductivity of general graphite block is only 75~105W / m·K
Therefore, the general graphite materials used in current heat exchangers are far from meeting the requirements of current heat exchanger designs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A graphite material for heat exchangers of the present invention, which is mainly prepared by mixing pitch mesophase carbon microspheres (hereinafter referred to as: MCMB), needle-shaped petroleum coke and modified pitch (softening point temperature is 196°C); wherein MCMB The mass ratio of phase material (tertiary coking needle petroleum coke) is 9:1; the amount of modified asphalt added is 15% of the total weight of raw materials (modified asphalt + MCMB + stage material).

[0037] The preparation method of the heat exchanger graphite material of the present embodiment comprises the following steps:

[0038] (1) Put the modified asphalt (the softening point temperature is 196°C) into a hot oil furnace and heat it at 220°C for 36 hours. The oil furnace cover needs to be half-opened to make the modified asphalt slurry;

[0039] (2) Grind the needle-shaped petroleum coke with an airflow until the particle size is D50=8 microns, then put 40Kg of needle-shaped petroleum co...

Embodiment 2

[0047] A graphite material for heat exchangers of the present invention is mainly prepared by mixing pitch mesophase carbon microspheres (hereinafter referred to as MCMB), needle-shaped petroleum coke and modified pitch (softening point temperature is 196°C); wherein MCMB and The mass ratio of tertiary coking needle petroleum coke is 8:2; the amount of modified asphalt added is 18% of the total weight (modified asphalt + MCMB + tertiary coking needle petroleum coke).

[0048] The preparation method of the heat exchanger graphite material of the present embodiment comprises the following steps:

[0049] (1) Put the modified asphalt (the softening point temperature is 196°C) into a hot oil furnace and heat it at 220°C for 36 hours, and the oil furnace cover is half open to make the modified asphalt slurry;

[0050] (2) Grind the needle-shaped petroleum coke with an airflow until the particle size is D50=8 microns, then put 40Kg of needle-shaped petroleum coke into the vacuum kne...

Embodiment 3

[0058] A graphite material for heat exchangers of the present invention is mainly prepared from pitch mesocarbon microspheres (hereinafter referred to as: MCMB), needle-shaped petroleum coke and modified pitch (softening point temperature is 196°C); wherein MCMB and three The mass ratio of coking needle petroleum coke is 7:3; the amount of modified asphalt added is 20% of the total weight (modified asphalt + MCMB + tertiary coking needle petroleum coke).

[0059] The preparation method for the graphite heat exchanger material of the present embodiment comprises the following steps:

[0060] (1) Put the modified asphalt (the softening point temperature is 196°C) into a hot oil furnace and heat it at 220°C for 36 hours, and the oil furnace cover is half open to make the modified asphalt slurry;

[0061] (2) Grind the needle-shaped petroleum coke with an airflow until the particle size is D50=8 microns, then put 40Kg of needle-shaped petroleum coke into the vacuum kneader, open a...

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Abstract

Provided is a graphite material for a heat exchanger. The graphite material is mainly prepared by mixing pitch meso-carbon microbeads, a petroleum coke stage material and modified pitch, wherein the petroleum coke stage material is needle petroleum coke subjected to secondary coking or third-time coking. A preparation method comprises the steps that the petroleum coke and modified pitch slurry are subjected to mixing kneading and rolling and flaking under vacuum condition, cooling and smashing are conducted in sequence, the smashed materials are subjected to mixing, standing, isostatic press molding, calcining and smashing, and the petroleum coke stage material is obtained; the petroleum coke stage material and the pitch meso-carbon microbeads are subjected to mixing kneading, the modified pitch is added and rolled to be flakes, cooling and smashing are conducted in sequence, the smashed materials are subject to mixing, standing, isostatic press molding, calcining carbonization treatment and graphitization treatment, and the graphite material for the heat exchanger is obtained. According to the graphite material for the heat exchanger, the needle petroleum coke subjected to secondary coking or third-time coking is used for the first time, toughness and self-lubrication of graphite are enhanced, the processing efficiency of graphite machinery is improved, and thermal conductivity of graphite pieces can be increased.

Description

technical field [0001] The invention relates to the field of graphite materials, in particular to a high-density, high-strength graphite material for heat exchangers and a preparation method thereof. Background technique [0002] Graphite has inherent advantages such as good corrosion resistance, high temperature resistance, good thermal conductivity, low thermal expansion coefficient, and high strength. It can be applied to industries such as chemical industry, smelting, and oil refining that produce a large amount of high-temperature, corrosive, strong acid, and strong alkali gases and liquids. Especially in the use of cooling device heat exchangers, graphite material has particularly obvious performance advantages. Nowadays, the design of heat exchange pipelines is becoming more and more complicated, and the cooling efficiency is getting higher and higher. The requirements for graphite itself must be further improved. Not only the material requires good compactness, high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/532C04B35/622
CPCC04B35/532C04B35/622C04B2235/422C04B2235/48
Inventor 杨程刘金平
Owner HUNAN CHANGYU NEW CARBON MATERIALS
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