95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier and preparation method thereof

A technology of pressurized gasification and coal-water slurry, which is applied in the field of refractory materials and can solve the problems of restricting the operating rate of gasifiers and the economic benefits of enterprises

Inactive Publication Date: 2010-12-15
李正平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, with the improvement of coal gasification technology, the increase of furnace type and the improvement of the gasification furnace from the top spray nozzle to the side spray four nozzles, the use of 90 chromium aluminum zirconium bricks in the vault and slag mouth of the gasifier The service life is about 5,000 hours and 4,000 hours respectively, which has seriously restricted the operating rate of the gasifier and the economic benefits of the enterprise

Method used

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  • 95 chromium-aluminum-zirconium brick for coal water slurry pressurized gasifier and preparation method thereof

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Embodiment 1

[0025] A 95 chrome-aluminum-zirconium brick for a coal-water slurry pressurized gasifier, the raw materials of which are calculated by weight percentage: fused chromium oxide 4mm-2mm 40%, fused chromium oxide 2mm-0mm 25%, fused chromium oxide ≤ 0.088 mm 23.5%, chromium oxide green 5.0%, zirconia micropowder 1.5%, α-Al 2 o 3 5.0% of fine powder; according to the percentage of the total amount of raw materials, 2.5% of aluminum dihydrogen phosphate and 0.4% of dextrin are added.

Embodiment 2

[0027] A 95 chrome-aluminum-zirconium brick for a coal-water slurry pressurized gasifier, the raw materials of which are calculated by weight percentage: fused chromium oxide 4mm-2mm 45%, fused chromium oxide 2mm-0mm 20%, fused chromium oxide ≤ 0.088 mm 22.5%, chromium oxide green 5.0%, zirconia micropowder 2.0%, α-Al 2 o 3 5.5% of fine powder; according to the percentage of the total amount of raw materials, 3.0% of aluminum dihydrogen phosphate and 0.35% of dextrin are added.

Embodiment 3

[0029] A 95 chromium-aluminum-zirconium brick for a coal-water slurry pressurized gasifier, the raw materials of which are calculated by weight percentage: fused chromium oxide 4mm-2mm 50%, fused chromium oxide 2mm-0mm 15.0%, fused chromium oxide ≤ 0.088 mm 21.0%, chromium oxide green 5.0%, zirconia micropowder 3.0%, α-Al 2 o 3 6.0% of fine powder; according to the percentage of the total amount of raw materials, 3.5% of aluminum dihydrogen phosphate and 0.3% of dextrin are added.

[0030] In the above-mentioned embodiments, the weight percentage of chromium oxide in fused chromium oxide is more than or equal to 99%; The particle composition is less than or equal to 5 μm, and the weight percentage of zirconia in zirconia powder is ≥97%; α-Al 2 o 3 Micropowder consists of particles with a particle size less than or equal to 5 μm, α-Al 2 o 3 α-Al in fine powder 2 o 3 The weight percentage is more than or equal to 99%; the aluminum dihydrogen phosphate is liquid; the dextr...

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Abstract

The invention belongs to the technical field of refractory materials, and discloses a 95 chromium-aluminum-zirconium brick for a coal water slurry pressurized gasifier and a preparation method thereof. The 95 chromium-aluminum-zirconium brick comprises electrically fused chromium oxide, chromium oxide green, fine zirconium oxide powder, fine alpha-Al2O3 powder and an adhesive serving as raw materials in percentage by weight; the preparation method comprises the following steps of: (1) weighing the raw materials in percentage by weight; (2) mixing and rolling the raw materials in a wet mill toform slurry; (3) pressing the slurry in a friction press to prepare a half-finished product; (4) drying the half-finished product in a drying kiln; (5) firing the dried half-finished product in an automatic shuttle kiln; and (6) taking the finished product out of the kiln, and checking the appearance and the physicochemical property of the product. Compared with the conventional 90 chromium-aluminum-zirconium brick, the 95 chromium-aluminum-zirconium brick has the advantages that the scour resistance, corrosion resistance, volume density, and ambient compressive strength are improved and the service life of the 95 chromium-aluminum-zirconium brick is improved by 20 to 50 percent.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a 95 chrome-aluminum-zirconium brick for a coal-water slurry pressurized gasification furnace and a preparation method thereof. Background technique [0002] At present, 90 chromium aluminum zirconium bricks (commonly known as high chrome bricks) are generally used as fire bricks for coal-water slurry pressurized gasifiers. The physical and chemical indicators of 90 chromium aluminum zirconium bricks are: Cr 2 o 3 Mass content ≥ 86%, ZrO 2 The mass content is 4-7%, Fe 2 o 3 Mass content≤0.4%, bulk density≥4.2g / cm 3 , Apparent porosity ≤ 17%, room temperature compressive strength ≥ 100Mpa. Because 90 chromium aluminum zirconium brick has the advantages of high volume density, low apparent porosity, high pressure resistance at room temperature, low content of impurities such as iron oxide and silicon oxide, and also has good thermal stability and high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/12C04B35/622
Inventor 李正平焦伶侠刘豪
Owner 李正平
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