Multilayer structure pellet, preparation method thereof, and lightweight heat transfer coating containing multilayer structure pellet

A multi-layer structure and pellet technology, applied in the field of refractory materials, can solve the problems of easy scaling, easy corrosion on the surface of high-temperature heat exchangers, and reduced heat transfer efficiency, and achieve good resistance, corrosion resistance, and thermal conductivity. Good results

Active Publication Date: 2019-09-06
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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  • Multilayer structure pellet, preparation method thereof, and lightweight heat transfer coating containing multilayer structure pellet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] 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:

[0069] 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;

[0070] The percentage of each layer's total weight of multi-layer structure pellets: from inside to outside, in order: heat transfer layer 1: 26%, transition layer 2: 22%, anti-corrosion layer 3: 28%, high temperature resistant layer 4: twenty four%;

[0071] 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%;

[0072] The raw material composition and weight percentage content of the transition layer are as follows: asp...

Embodiment 2

[0103] 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:

[0104] 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;

[0105]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%;

[0106] 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%;

[0107] The raw material composition and weight percentage content of the transition layer are as follows: asphalt with a softening point temperature not lower th...

Embodiment 3

[0138] 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:

[0139] 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;

[0140] The percentage of each layer's total weight of multi-layer structure pellets: from inside to outside, in order: heat transfer layer 1: 35%, transition layer 2: 14%, anti-corrosion layer 3: 20%, high temperature resistant layer 4: 31%;

[0141] The raw material composition and weight percentage content of the heat transfer layer are: coke powder with a particle size of ≤1mm: 49%, graphite powder with a particle size of ≤0.088mm: 42%, heavy washing oil: 9%;

[0142] The raw material composition and weight percentage content of the transition layer are: asphalt with a softening point temperature not lower than 95°C:...

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Abstract

A multilayer structure pellet sequentially comprises a heat transfer layer, a transition layer, an anticorrosion layer and a high temperature-resistant layer from the inside to the outside; and all the layers are closely bonded. A preparation method of the multilayer structure pellet is characterized in that the multilayer structure pellet is prepared layer by layer from the inside to the outside.A heat transfer coating containing the multilayer structure pellet comprises 40-65 wt% of the multilayer structure pellet having a particle size of 6 mm or below, 10-30 wt% of fused white corundum having a particle size of 0.074-1 mm, 18-55 wt% of silicon carbide with a particle size of 0.074 mm or below, 0.1-0.5 wt% of aluminum powder with a particle size of 0.074 mm or below and 5-18 wt% of a boehmite sol. A preparation method of the coating comprises the following steps: mixing and stirring the multilayer structure pellet, fused white corundum, silicon carbide and aluminum powder to uniformity, adding the boehmite sol, and performing stirring to prepare the coating for later use. The lightweight heat transfer coating containing the multilayer structure pellet has can resist the high temperature of 1500 DEG C or above; and after the coating is used for 8 months, the surface corrosivity of a whole coating layer formed by the coating does not exceed 1%, the surface scaling rate does not exceed 2.6%, the surface has no obvious cracks, and the heat transfer performance is not less than 1.80 w / 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 Applications(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
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