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A kind of multi-layer structure spheroid and preparation method and light heat transfer coating containing multi-layer structure spheroid

A multi-layer structure and ball technology, applied in the field of refractory materials, can solve the problems of high-temperature heat transfer device surface corrosion, heat transfer efficiency reduction, easy scaling, etc., to achieve good resistance, good thermal conductivity, corrosion resistance Good results

Active Publication Date: 2021-04-06
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problems that the surface of the high-temperature heat transfer device of the coking hydrogenation reactor is easily corroded, easily scaled, and the heat transfer efficiency is reduced. Layer structure spheroids and heat transfer coatings containing multilayer structure spherules

Method used

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  • A kind of multi-layer structure spheroid and preparation method and light heat transfer coating containing multi-layer structure spheroid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A kind of multi-layer structure spherulite, its composition structure and the percentage that each layer accounts for the multi-layer structure spherulite gross weight is:

[0067] Structure: from inside to outside: heat transfer layer 1, transition layer 2, anti-corrosion layer 3, high temperature resistant layer 4; and between layers

[0068] are closely bonded;

[0069] The percentage of each layer's total weight of the multi-layer structure pellets: from the inside to the outside, in order: heat transfer layer 1: 26%, transition layer 2: 22%, anti-corrosion layer 3: 28%, high temperature resistant layer 4: twenty four%;

[0070] The raw material composition and weight percentage content of the heat transfer layer are: coke powder with a particle size of ≤1mm: 42%, waste electrode powder with a particle size of ≤0.088mm: 41%, tar and heavy washing oil mixed in any proportion: 17%;

[0071] The raw material composition and weight percentage content of the transition...

Embodiment 2

[0102] A kind of multi-layer structure spherulite, its composition structure and the percentage that each layer accounts for the multi-layer structure spherulite gross weight is:

[0103] Structure: from inside to outside: heat transfer layer 1, transition layer 2, anti-corrosion layer 3, high temperature resistant layer 4; and the layers are tightly bonded;

[0104]The percentage of each layer's total weight of multi-layer structure pellets: from inside to outside, in order: heat transfer layer 1: 31%, transition layer 2: 16%, anti-corrosion layer 3: 23%, high temperature resistant layer 4: 30%;

[0105] The raw material composition and weight percentage content of the heat transfer layer are: coke powder with a particle size of ≤1mm: 46%, waste electrode powder with a particle size of ≤0.088mm: 41%, and tar: 13%;

[0106] The raw material composition and weight percentage content of the transition layer are: asphalt with a softening point temperature not lower than 95°C: 48...

Embodiment 3

[0137] A kind of multi-layer structure spherulite, its composition structure and the percentage that each layer accounts for the multi-layer structure spherulite gross weight is:

[0138] Structure: from inside to outside: heat transfer layer 1, transition layer 2, anti-corrosion layer 3, high temperature resistant layer 4; and between layers

[0139] are closely bonded;

[0140] The percentage of each layer in the total weight of the multilayer structure pellets: from the inside to the outside, in order: heat transfer layer 1: 35%, transition layer 2:

[0141] 14%, anti-corrosion layer 3: 20%, high temperature resistant layer 4: 31%;

[0142] The raw material composition and weight percentage content of the heat transfer layer are: coke powder with particle size ≤ 1mm: 49%, graphite powder with particle size ≤ 0.088mm: 42%, heavy washing oil: 9%;

[0143] The raw material composition and weight percentage content of the transition layer are: asphalt whose softening point te...

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Abstract

A multi-layer structure spherulite, its composition structure: from inside to outside: heat transfer layer, transition layer, anti-corrosion layer, high temperature resistant layer; and the layers are closely bonded; its preparation method : Prepared layer by layer from inside to outside. The raw material composition and wt% of the heat transfer coating containing multi-layer structure spheroids are as follows: multi-layer structure spheroids with a particle size of no more than 6mm: 40%~65%, fused white corundum with a particle size of 0.074~1mm: 10%~30 %, silicon carbide with particle size ≤0.074mm: 18%~55%, aluminum powder with particle size ≤0.074mm: 0.1%~0.5%, boehmite sol 5%~18%; coating preparation steps: multi-layer structure pellets, Fused white corundum, silicon carbide, and aluminum powder are mixed and stirred until uniform, then boehmite sol is added and stirred; set aside. The light-weight heat-transfer coating containing multi-layer structure spheroids prepared by the present invention has a high temperature resistance above 1500°C. When used for 8 months, the corrosion rate of the entire coating surface does not exceed 1%, and the scaling rate of the coating surface does not exceed 2.6%, and no obvious cracks, the heat transfer performance is not less than 1.80w / m.k.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a multilayer structure spheroid and a preparation method, as well as a heat transfer coating containing the multilayer structure spheroid, which is suitable for use in heat exchange devices. Background technique [0002] In order to reduce energy consumption in metallurgical and chemical production, heat exchange devices are usually used for waste heat recycling, usually called preheaters or heat transfer devices, but due to the high temperature of the contact surface between the heat exchange device and the heat source, it is highly corrosive , easy to scale and other problems, it is necessary to cover the contact surface between the heat exchange device and the heat source with a protective layer, that is, to use anti-corrosion paint for protection. In use, although it can protect the heat exchange device, it hinders heat transfer and cannot realize rap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/10C09D5/16C09D1/00
CPCC09D1/00C09D5/103C09D5/1687C09D5/18
Inventor 周旺枝刘黎张洪雷徐国涛
Owner 武汉钢铁有限公司