High-heat conductivity and wear-resistant composite material

A composite material and high thermal conductivity technology, which is applied in the field of refractory materials for circulating fluidized bed boilers, can solve the problem of insufficient erosion resistance and thermal shock stability, affecting the safe operation of circulating fluidized bed boilers, and the construction of circulating fluidized bed boilers. It can improve the strength and thermal conductivity, prolong the operation period of the boiler, and reduce the energy consumption of the boiler operation.

Inactive Publication Date: 2017-11-07
YIXING GUOQIANG FURNACE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The construction system of circulating fluidized bed boilers is complex, the construction volume is large, the concentration of coal ash and dust in the furnace is high, and the flow rate is large, so the performance requirements for refractory materials are particularly strict
The refractories used in existing circulating fluidized bed boilers are made of high-alumina clinker or white corundum raw materials, with high cement content, resulting in unsatisfactory wear resistance, erosion resistance, erosion resistance and thermal shock stability. Strict requirements of circulating fluidized bed boiler technology, requiring frequent repair or replacement
[0003] In addition, more importantly, the refractory materials used in existing circulating fluidized bed boilers have low thermal conductivity, resulting in high bed temperature of circulating fluidized bed boilers, and SO 2 and NO x The high emission affects the normal and safe operation of the circulating fluidized bed boiler, and also causes the high operating cost of the circulating fluidized bed boiler
[0004] The thermal conductivity of existing wear-resistant materials can generally only reach 5 under the premise of ensuring high wear resistance. If the thermal conductivity is further increased, other properties will be reduced, resulting in low overall performance of refractory materials, which needs to be improved

Method used

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Effect test

Embodiment 1

[0017] Embodiment 1: High thermal conductivity and wear-resistant composite material, composed of main materials and auxiliary materials, the weight ratio of main materials and auxiliary materials is 71:29, and the main materials and auxiliary materials are respectively composed of the following raw materials in parts by weight:

[0018] Main ingredients, 18 parts of zirconium corundum fine powder with a particle size of 1-2.5 mm; 25 parts of silicon carbide fine powder with a particle size of 0.5 mm-1 mm; 6.7 parts of zirconia fine powder with a particle size of 0.072-0.093 mm; nano-aluminum nitride 10 parts 9 parts of pure calcium aluminate cement; 8 parts of carbon fiber; 4 parts of magnesia-zirconium sand; 9 parts of silicon micropowder; 5 parts of alumina micropowder; 0.3 part of sodium triphosphate; 1 part of calcium chromate; The silica powder is fused silica powder with a silicon content ≥ 98%, and the magnesium oxide content in the magnesia-zircon sand is 92%.

[0019...

Embodiment 2

[0029] The high thermal conductivity and wear-resistant composite material is composed of main materials and auxiliary materials. The weight ratio of main materials and auxiliary materials is 85:15. The main materials and auxiliary materials are composed of the following raw materials in parts by weight:

[0030] Main ingredients, 21 parts of zirconium corundum fine powder with a particle size of 1-2.5 mm; 20 parts of silicon carbide fine powder with a particle size of 0.5-1 mm; 15 parts of zirconia fine powder with a particle size of 0.072-0.093 mm; 14 parts of nano-aluminum nitride 6.2 parts of pure calcium aluminate cement; 4 parts of carbon fiber; 7 parts of magnesia-zirconium sand; 5 parts of silicon micropowder; 3 parts of alumina micropowder; The silica powder is fused silica powder with a silicon content ≥ 98%, and the magnesium oxide content in the magnesia-zircon sand is 92%.

[0031] Auxiliary materials, 73.8 parts of phosphoric acid with a mass percentage concentra...

Embodiment 3

[0041] The high thermal conductivity and wear-resistant composite material is composed of main materials and auxiliary materials. The weight ratio of main materials and auxiliary materials is 79:21. The main materials and auxiliary materials are composed of the following raw materials in parts by weight:

[0042] Main ingredients, 19 parts of zirconium corundum fine powder with a particle size of 1-2.5 mm; 21 parts of silicon carbide fine powder with a particle size of 0.5-1 mm; 18 parts of zirconia fine powder with a particle size of 0.072-0.093 mm; 9 parts of nano-aluminum nitride 5 parts of pure calcium aluminate cement; 4 parts of carbon fiber; 5 parts of magnesia-zircon sand; 7 parts of silicon micropowder; 7 parts of alumina micropowder; The silica powder is fused silica powder with a silicon content ≥ 98%, and the magnesium oxide content in the magnesia-zircon sand is 92%.

[0043] Auxiliary materials, 75.3 parts of phosphoric acid with a mass percentage concentration o...

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Abstract

A high-heat conductivity and wear-resistant composite material comprises a main material and an auxiliary material, wherein the main material comprises zirconium corundum fine powder, nanometer aluminum nitride, pure calcium aluminate cement, carbon fiber, magnesium zirconium sand, silica micropowder, aluminum oxide micropowder, sodium tripolyphosphate, silicon carbide, graphene and the like; and the auxiliary material comprises phosphoric acid, ink-grade aluminum hydroxide, aluminum oxide, graphene, a sintering agent and the like. The high-heat conductivity and wear-resistant composite material provided by the invention has high compressive strength, high compactness, very high wear resistance, corrosion resistance and scouring resistance, heat shock stability and high heat conductivity. The high-heat conductivity and wear-resistant composite material is applied to wear-resistant and flame-isolating parts of a circulating fluidized bed boiler and chemical and industrial kilns, and can prolong the service life of wear-resistant layers of the wear-resistant and flame-isolating parts, so that the complex repair times, the maintenance cycle and the maintenance cost are reduced, and thus a requirement on long-cycle safe operation of the high-temperature wear-resistant layer of the circulating fluidized bed boiler is met.

Description

technical field [0001] The invention relates to a refractory material for a circulating fluidized bed boiler, in particular to a high thermal conductivity wear-resistant composite material. Background technique [0002] The construction system of the circulating fluidized bed boiler is complex, the construction volume is large, the concentration of coal ash and dust in the furnace is high, and the flow rate is large, so the performance requirements for refractory materials are particularly strict. The refractories used in existing circulating fluidized bed boilers are made of high-alumina clinker or white corundum raw materials, with high cement content, resulting in unsatisfactory wear resistance, erosion resistance, erosion resistance and thermal shock stability. The stringent requirements of circulating fluidized bed boiler technology require frequent repairs or replacements. [0003] In addition, more importantly, the refractory materials used in existing circulating fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/565
CPCC04B35/565C04B35/66C04B2235/3206C04B2235/3217C04B2235/3218C04B2235/3243C04B2235/3244C04B2235/3409C04B2235/3418C04B2235/3865C04B2235/425C04B2235/447C04B2235/5248C04B2235/77C04B2235/96C04B2235/9615
Inventor 林国强赵鹏姚翔
Owner YIXING GUOQIANG FURNACE IND
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