High-strength CFB boiler high-aluminum refractory plastic material

A plasticable and high-strength technology, which is applied in the field of high-strength CFB boiler high-alumina refractory plastics, can solve the problems of further improvement in wear resistance, increased wear, and high sintering temperature, achieving high density, increased strength, The effect of excellent wear resistance

Active Publication Date: 2019-03-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the high temperature wear-resistant coating of CN 100467428C is composed of first material and second material in a weight ratio of 70-85:30-15. Micropowder, pure calcium aluminate cement, and sodium tripolyphosphate are compatible, and the second material is compatible with 85 phosphoric acid, ink-grade aluminum hydroxide, and zirconia ultrafine powder; but the high-temperature wear-resistant coating prepared by it needs to be sintered at 1100°C to achieve pressure resistance Strength of 75-90MPa, flexural strength of 11-13MPa; CN 101428997B discloses a high-temperature wear-resistant coating and a preparation method thereof. The material is made of zirconium corundum, corundum fine powder, No. 3 kyanite, yttrium-based stabilized zirconium, silicon micropowder, alumina micropowder, pure calcium aluminate cement, sodium tripolyphosphate, and fused calcium chromate; Phosphoric acid, ink-grade aluminum hydroxide, zirconia superfine powder, yttrium-based stabilized zirconium, and fused calcium chromate; although its compressive strength has been significantly improved compared with CN100467428C, it still has the problem of high sintering temperature. Moreover, the amount of wear still needs to be improved; CN 102134164 A further improves the compressive strength and flexural strength on this basis, but there is also the need to sinter at 1100°C to achieve the corresponding effect
However, it is common knowledge in the field that in the range of 800-1600°C, generally, the higher the sintering temperature, the higher the strength; these documents that have been reported cannot achieve high strength at a lower temperature (such as 900°C). Its wear resistance also needs to be further improved
In addition, these repairing materials currently reported have problems such as complex formulas and inconvenient construction.

Method used

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  • High-strength CFB boiler high-aluminum refractory plastic material
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  • High-strength CFB boiler high-aluminum refractory plastic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A high-strength CFB boiler refractory plastic, including a filler (B material) and a rubber material (A material) with a weight ratio of 100:16.3; wherein the rubber material (A material) is aluminum dihydrogen phosphate with a density of 1.65g / ml Solution; filler (B material) comprises the component of following weight fraction:

[0035]

[0036] The preparation method comprises the following steps:

[0037] Weigh each substance in the filler according to the mass ratio, mix evenly and add sizing material accounting for 16.3% of the mass of material B and continue mixing to make them stick together to form a soft refractory plastic with construction property. The prepared refractory plastic is compacted and solidified in a mold of 40×40×160 mm. After demoulding, it is calcined at 900° C. for 3 hours, and the compressive strength reaches 185 MPa, and the flexural strength reaches 33 MPa.

Embodiment 2

[0039] A high-strength CFB boiler refractory plastic, including a filler (B material) and a rubber material (A material) with a weight ratio of 100:22; wherein the rubber material (A material) is aluminum dihydrogen phosphate with a density of 1.45g / ml Solution; filler (B material) comprises the component of following weight fraction:

[0040]

[0041] The refractory plastic of this embodiment mainly uses aluminum dihydrogen phosphate as a binder, and does not need to add other components in the liquid-phase rubber made; the concentration of material A and the mixing ratio with material B can effectively Improve the strength of refractory plastic; through the reaction of divalent metal oxide and aluminum oxide, the strength of the repair material is improved; the corundum aggregate also effectively increases the density and hardness of the repair material; adding silica fume improves the construction performance of the repair material (fluidity and plasticity), and improve ...

Embodiment 3

[0045]A high-strength CFB boiler refractory plastic, including a filler (B material) and a rubber material (A material) with a weight ratio of 100:16; wherein the rubber material (A material) is aluminum dihydrogen phosphate with a density of 1.7g / ml Solution; filler (B material) comprises the component of following weight fraction:

[0046]

[0047]

[0048] The preparation method comprises the following steps:

[0049] Weigh each substance in the filler according to the mass ratio, mix evenly and add sizing material accounting for 16% of the mass of material B and continue mixing to make them stick together to form a soft refractory plastic with construction property. The prepared refractory plastic is compacted and solidified in a mold of 40×40×160 mm. After demoulding, it is calcined at 900° C. for 3 hours, and the compressive strength reaches 195 MPa, and the flexural strength reaches 35 MPa.

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Abstract

The invention discloses a high-strength CFB boiler high-aluminum refractory plastic material, and belongs to the technical field of high-strength wear resistant plastic materials. The refractory plastic material of the invention can reach high strength in a range below 900 DEG C. After calcination at 900 DEG C for 3 hours, tests show that the compressive strength is stable to 190-210 MPa and the flexural strength is stable to 33-38 MPa. Compared with a conventional CFB refractory plastic material, the refractory plastic material of the invention is greatly improved in strength. The refractoryplastic material of the invention is convenient in construction and suitable for industrial applications.

Description

technical field [0001] The invention relates to a high-strength CFB boiler high-alumina refractory plastic, which belongs to the technical field of high-strength wear-resistant plastic. Background technique [0002] Circulating fluidized bed (CFB) boiler technology is a high-efficiency and low-pollution clean combustion technology for low-quality coal such as coal gangue that has developed rapidly in the past ten years. It operates at around 900°C. The principle of circulating fluidized bed is that low-quality fuel such as coal gangue is fluidized under the action of wind and circulated for combustion, and limestone is added at the same time to achieve desulfurization during the combustion process. During the operation of the coal circulating fluidized bed boiler, a large amount of fluidized materials are constantly in the high-temperature circulation flow, and a large number of particles will wash the refractory material on the inner wall of the boiler, causing the lining ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101C04B35/64
CPCC04B35/101C04B35/64C04B2235/3222C04B2235/326C04B2235/3284C04B2235/3418C04B2235/602C04B2235/96C04B2235/9607
Inventor 魏慧贤蒋严伟
Owner JIANGNAN UNIV
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