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Ceramic tube for isothermal gradient heat exchanger and preparation method thereof

A technology of ceramic tubes and heat exchangers, which is applied in the field of ceramic tubes and preparations for temperature gradient heat exchangers, can solve the problems of low heat exchange efficiency, high production cost, and short service life, and achieve high heat exchange efficiency and high operating temperature , the effect of short curing time

Inactive Publication Date: 2010-02-24
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-temperature ceramic heat exchangers generally use ceramic honeycomb regenerators and ceramic ball regenerators. The heat exchange gas and high-temperature flue gas frequently alternate and reverse flow for heat exchange. Due to the continuous thermal shock of the regenerator, the damage is serious. Short service life, low heat exchange efficiency and high production cost

Method used

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  • Ceramic tube for isothermal gradient heat exchanger and preparation method thereof
  • Ceramic tube for isothermal gradient heat exchanger and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Forming of ceramic tubes for isothermal gradient heat exchangers

[0022] The particle size is 100 μm silicon carbide powder, 30 μm silicon carbide powder, 10 μm silicon carbide powder, 2 μm silicon powder, 2 μm silicon dioxide powder, phenolic resin, liquid paraffin at 10:20:10:6.4:13.6:30:10 The weight ratio is uniformly mixed, mixed in a vacuum mud mixer to make silicon carbide ceramic plastic mud, extruded, and cut to make silicon carbide ceramic plastic pipes.

[0023] 2. Curing:

[0024] Dry the silicon carbide ceramic plastic tube after demolding at a temperature of 160° C. for 0.5 hour to make a ceramic tube body for an isothermal gradient heat exchanger.

[0025] 3. Firing:

[0026] The solidified ceramic tube body for isothermal gradient heat exchangers was fired at 1400° C. for 10 hours in a nitrogen atmosphere to make ceramic tubes for isothermal gradient heat exchangers.

[0027] The purity of the batching raw materials used in the experiment is indus...

Embodiment 2

[0030] 1. Forming of ceramic tubes for isothermal gradient heat exchangers

[0031] Silicon carbide powder with a particle size of 100 μm, silicon carbide powder of 30 μm, silicon carbide powder of 10 μm, silicon micropowder of 1 μm, silicon dioxide micropowder of 1 μm, phenolic resin, ethanol, liquid paraffin, and glycerol were mixed in a ratio of 15:30:15:3.2:6.8 : 10: 10: 5: 5 in a weight ratio of 10: 10: 5: 5, kneaded in a vacuum mud mill to make silicon carbide ceramic plastic mud, extruded, and cut to make silicon carbide ceramic plastic pipes.

[0032] 2. Curing:

[0033] Dry the silicon carbide ceramic plastic tube after demolding at a temperature of 80° C. for 1.5 hours to make a ceramic tube body for an isothermal gradient heat exchanger.

[0034] 3. Firing:

[0035] The solidified ceramic tube body for isothermal gradient heat exchangers was fired at 1580° C. for 4 hours in a nitrogen atmosphere to make ceramic tubes for isothermal gradient heat exchangers.

[00...

Embodiment 3

[0039] 1. Forming of ceramic tubes for isothermal gradient heat exchangers

[0040] SiC powder with a particle size of 100 μm, 30 μm silicon carbide, 10 μm silicon carbide, 1 μm silicon micropowder, 1 μm silica micropowder, phenolic resin, and ethanol at a ratio of 20:40:20:1.6:3.4:10:5 The weight ratio is uniformly mixed, mixed in a vacuum mud mixer to make silicon carbide ceramic plastic mud, extruded, and cut to make silicon carbide ceramic plastic pipes.

[0041] 2. Curing:

[0042] Dry the silicon carbide ceramic plastic tube after demolding at a temperature of 100° C. for 1 hour to make a ceramic tube body for an isothermal gradient heat exchanger.

[0043] 3. Firing:

[0044] The solidified ceramic tube body for isothermal gradient heat exchangers was fired at 1700° C. for 5 hours in a nitrogen atmosphere to make ceramic tubes for isothermal gradient heat exchangers.

[0045] The purity of the batching raw materials used in the experiment is industrial pure.

[0046...

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Abstract

The invention provides a ceramic tube for an isothermal gradient heat exchanger and a preparation method thereof. The ceramic tube is characterized in that the ceramic tube comprises two ceramic tubeswith different diameters which are sheathed with each other concentrically and radial connecting reinforcements are distributed evenly between the two ceramic tubes. The preparation method comprisesthe following steps: preparing pug, shaping, curing and sintering. The preparation method is characterized in that a certain grain size of silicon carbide powder, ceramic bonding agent, plasticizer and lubricant are mixed according to a defined ratio and annealed in a vacuum pug mill to prepare silicon carbide ceramic plastic slurry, performing extrusion molding to the silicon carbide ceramic plastic slurry, cutting, curing under a certain temperature and time to prepare ceramic tube green body for an isothermal gradient heat exchanger and finally firing under a certain temperature and atmosphere to prepare the ceramic tube for the isothermal gradient heat exchanger. The ceramic tube for the isothermal gradient heat exchanger prepared by the preparation method of the invention has high strength, heat conduction coefficient and heat transmission efficiency and can recycle 100% of heat which is carried by the exhaust gas to the environment.

Description

technical field [0001] The invention relates to a ceramic tube for an isothermal gradient heat exchanger and a preparation method thereof, belonging to the technical field of ceramic preparation. Background technique [0002] High-temperature ceramic heat exchangers generally use ceramic honeycomb regenerators and ceramic ball regenerators. The heat exchange gas and high-temperature flue gas frequently alternate and reverse flow for heat exchange. Due to the continuous thermal shock of the regenerator, the damage is serious. The service life is short, and the heat exchange efficiency is low, and the production cost is high. Contents of the invention [0003] The object of the present invention is to provide a ceramic tube for an isothermal gradient heat exchanger and a preparation method that can overcome the above-mentioned defects, adapt to a wide working temperature range, and have excellent performance. Its technical solution is: [0004] A ceramic tube for an isothe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F1/00C04B35/622C04B35/565
Inventor 唐竹兴
Owner SHANDONG UNIV OF TECH