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Near-zero heat loss refractory lining for batch-operated high-temperature kiln and preparation method thereof

A refractory material and intermittent technology, which is applied to the field of near-zero heat loss refractory linings and their preparation in intermittent operation of high-temperature kilns, can solve problems such as restricting applications, reducing the service life of furnace lining refractories, cracking and peeling of refractories, etc.

Active Publication Date: 2021-06-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, "a lightweight corundum-spinel castable and its preparation method" (CN 105236995) patent technology uses microporous corundum as the main aggregate to prepare a lightweight corundum-spinel castable with low thermal conductivity. Thermal conductivity and bulk density are greatly reduced
However, the erosion and erosion performance of lightweight refractories against high-temperature media (such as molten steel, steel slag, special atmosphere, etc.) at high temperatures has not been verified in practice, which limits their application in actual industrial furnaces
[0004] In addition, for high-temperature industrial kilns that work intermittently, the lining refractory material is heated and cooled periodically, and the temperature gradient produces thermal stress. Under the action of this thermal fatigue or thermal shock, the refractory material cracks and peels off, reducing the use of the lining refractory material. life

Method used

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  • Near-zero heat loss refractory lining for batch-operated high-temperature kiln and preparation method thereof

Examples

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Effect test

preparation example Construction

[0072] The preparation method of the ceramic spherical shell is:

[0073] Mill 80-90wt% corundum fine powder, 5-15wt% mullite fine powder, 3-5wt% α-alumina fine powder and 1-3wt% silica fine powder in a ball mill for 5-8 minutes, Obtain a mixed powder; add zirconia sol accounting for 5 to 20 wt% of the mixed powder to the mixed powder, stir evenly to obtain a mixed mud; then use an injection molding machine to mold the mixed mud, Obtain a threaded hemispherical shell mud; then dry the threaded hemispherical shell mud at 110-180°C for 24-36h, and heat up to 1350°C at a rate of 3-5°C / min ~1650°C, keep warm for 2~4h, and make a ceramic hemispherical shell with threads.

[0074] The threaded ceramic hemispherical shell is divided into two types: a ceramic hemispherical shell with internal threads and a ceramic hemispherical shell with external threads; The threaded ceramic hemispherical shell is threaded into a hollow sphere to obtain a ceramic spherical shell.

[0075] The ann...

Embodiment 1

[0086] Disclosed are a near-zero heat loss refractory lining for a batch-operated high-temperature kiln and a preparation method thereof. Its preparation method is:

[0087] Step 1. The preparation methods of Al-Si-Ni alloy@alumina microcapsule, aluminum-silicon-iron alloy@alumina microcapsule and aluminum-silicon alloy@alumina microcapsule are respectively:

[0088] Al-Si-Ni alloy powder is alternately washed with alkali and deionized water for 3 to 5 times, then dried in a nitrogen atmosphere at 60 to 110°C for 8 to 12 hours, then placed in a high-temperature atmosphere furnace, and roasted in six stages, naturally After cooling, Al-Si-Ni alloy@alumina microcapsules were prepared.

[0089] Wash AlSiFe alloy powder with alkali and deionized water alternately for 3 to 5 times, then dry in nitrogen atmosphere at 60 to 110°C for 8 to 12 hours, then place it in a high-temperature atmosphere furnace, roast according to six stages, and cool naturally , to prepare aluminum silicon...

Embodiment 2

[0122] Disclosed are a near-zero heat loss refractory lining for a batch-operated high-temperature kiln and a preparation method thereof. Its preparation method is:

[0123] Step 1, with the step 1 of embodiment 1.

[0124] Step 2, with step 2 of embodiment 1.

[0125] Step 3, the preparation method of high temperature phase change heat storage refractory material

[0126] 58-62wt% Al-Si-Ni alloy@ceramic macrocapsule as aggregate, 28-32wt% Al-Si-Ni alloy@alumina microcapsule, 4.5-5.5wt% α-Al 2 o 3 Micropowder, 0.3-0.8wt% silicon micropowder and 4.5-5.5wt% calcium aluminate cement are used as matrix, and the sum of aggregate and matrix is ​​used as raw material. First mix the matrix with polycarboxylic acid accounting for 0.1-0.2wt% of the raw material to obtain a premixed matrix material; then mix the premixed matrix material with the aggregate, and then add 3-5wt% of the raw material water, stirred evenly, poured into shape, cured at 25-28°C and relative air humidity of ...

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Abstract

The invention relates to a near-zero heat loss refractory lining of a high-temperature kiln operated intermittently and a preparation method thereof. The technical solution is: the permanent lining refractory material of the refractory lining body is a phase change heat storage refractory material, that is, a high temperature phase change heat storage refractory material, a medium temperature phase change heat storage refractory material and a low temperature phase change heat storage refractory material. composed in sequence. The phase change heat storage refractory material is composed of alloy@ceramic macrocapsule, alloy@alumina microcapsule, α‑Al 2 o 3 It is prepared by mixing micropowder, silica micropowder, calcium aluminate cement and polycarboxylic acid with water, forming, demolding and drying. When preparing: Al-Si-Ni alloy @ Ceramic Large Capsule, Al-Si-Fe Alloy @ Ceramic Large Capsule and Al-Si Alloy @ Ceramic Large Capsule and the corresponding Al-Si-Ni alloy @ Aluminum Oxide Microcapsule in Alloy @ Ceramic Large Capsule Microcapsules, aluminum silicon ferroalloy@alumina microcapsules and aluminum silicon alloy@alumina microcapsules are prepared separately. The heat loss of the present invention is close to zero and the furnace lining refractory material has a long service life.

Description

technical field [0001] The invention belongs to the technical field of intermittently operated high-temperature kiln linings. In particular, it relates to a near-zero heat loss refractory lining of a high-temperature kiln operated intermittently and a preparation method thereof. Background technique [0002] Energy is the foundation of social development. Industrial energy consumption accounts for 32-35% of the world's total energy consumption, while my country's industrial energy consumption is as high as 70% of the total energy consumption. High-temperature industrial furnaces are major energy consumers, accounting for more than 48% of industrial energy consumption (Laveet Kumar, M. Hasanuzazzaman, N.A. Rahim. Global advancement of solar thermal energy technologies for industrial process heat and its future prospects: Review. Energy Conversion and Management, 2019, 195:885-908). Furnace lining refractories have a decisive impact on the energy consumption of industrial fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/622
CPCC04B35/622C04B35/66C04B2235/3217C04B2235/402C04B2235/404C04B2235/428
Inventor 张美杰顾华志王瑶黄奥付绿平杨爽夏求林
Owner WUHAN UNIV OF SCI & TECH
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