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Preparation method of ceramic fiber porous combustion medium with gradient pore structure

A technology of ceramic fibers and gradient pores is applied in the field of preparation of porous ceramics, which can solve the problems of reducing combustion stability, breaking, and being easily corroded, and achieve the effects of improving combustion stability, improving service life, and avoiding acoustic shock phenomena.

Inactive Publication Date: 2016-09-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the brittleness of the ceramic material itself and the thermal shock and acoustic shock during use, it is easy to cause breakage; the chemical properties of the metal material are active, and they are easily corroded in a high-temperature water-oxygen environment, and their service life is short. High-temperature tempering occurs, which is not suitable for high-temperature conditions; although ceramic fibers have excellent high-temperature strength and stability, the single pore structure reduces combustion stability and narrows the lean-burn limit

Method used

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  • Preparation method of ceramic fiber porous combustion medium with gradient pore structure
  • Preparation method of ceramic fiber porous combustion medium with gradient pore structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment one (single-phase fiber):

[0034] Select SiC chopped fibers with a length between 3-6mm and 10-13mm and mix them with a PVA solution with a concentration of 0.2% at a ratio of 0.4g:400mL, and mix evenly by stripping and stirring to obtain a uniform, short-term stable SiC chopped fiber suspension. The obtained SiC chopped fiber suspension is vacuum filtered to obtain a single layer of SiC chopped fiber paper with a certain pore structure and different fiber lengths. Then, the obtained single-layer SiC chopped fiber paper with different fiber lengths is laminated. The upper 3 layers are laminated with long fibers to obtain a large pore structure, and the lower 3 layers are laminated with short fibers to obtain a small pore structure, thereby obtaining a gradient pore structure. Structured SiC porous fiber mat. A certain pressure is applied to obtain a fiber mat with a thickness of about 3 mm, and then sprayed with a sizing glue for curing to obtain a SiC fib...

Embodiment 2

[0035] Embodiment two (multiphase fiber):

[0036] Choose mullite chopped fibers with a length of 3-6mm and SiC chopped fibers with a length of 10-13mm to mix with a CMC solution with a concentration of 0.2% in a ratio of 0.4g:400mL, and mix evenly by stripping and stirring to obtain Homogeneous, short-term stable mullite chopped fiber and SiC chopped fiber suspensions. The prepared mullite chopped fiber and SiC chopped fiber suspensions are vacuum filtered to obtain a single-layer mullite chopped fiber paper and SiC chopped fiber paper with a certain pore structure. The obtained single-layer mullite chopped fiber paper and SiC chopped fiber paper are laminated, the upper 3 layers are the macroporous structure obtained by laminating SiC fiber paper, and the lower 3 layers are obtained by laminating mullite fiber paper The small pore structure is used to obtain the mullite fiber-SiC fiber gradient porous mat, a certain pressure is applied to obtain a fiber mat with a thickness...

Embodiment 3

[0037] Embodiment three (multiphase fiber):

[0038] Choose Al with a length of 3-6mm and a diameter of 3-5μm 2 o 3 Chopped fibers and SiC chopped fibers with a diameter of 7-14 μm were mixed with 0.2% CMC solution at a ratio of 0.4g:400mL, and mixed evenly by stripping and stirring to obtain uniform, short-term stable Al 2 o 3 Chopped Fiber and SiC Chopped Fiber Suspension. Al obtained by vacuum filtration 2 o 3 Chopped fiber and SiC chopped fiber suspension to obtain a single layer of Al with a certain pore structure 2 o 3 Chopped fiber paper and SiC chopped fiber paper. The resulting monolayer Al 2 o 3 Chopped fiber paper and SiC chopped fiber paper are laminated, the upper 3 layers are the macroporous structure obtained by laminating SiC fiber paper, and the lower 3 layers are Al 2 o 3 The small pore structure obtained by lamination of fiber paper, resulting in Al 2 o 3 - SiC fiber gradient porous mat, apply a certain pressure to obtain a fiber mat with a thic...

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Abstract

The invention relates to a preparation method of a ceramic fiber porous combustion medium with a gradient pore structure. The preparation method comprises the following steps: respectively preparing a ceramic fiber suspension with different lengths or diameters by using ceramic fibers with different lengths or ceramic fibers with different diameters; carrying out suction filtration on the suspension to obtain ceramic fiber papers with different pore structures; laminating the ceramic fiber papers with a gradient pore structure (the fiber papers with a large pore structure are laminated at the upper portion, and the fiber papers with a small pore structure are laminated at the lower portion) according to a certain rule, and applying a certain pressure to obtain a ceramic fiber felt with a certain thickness and a gradient pore structure; and preparing a ceramic phase matrix on the ceramic fiber felt through a chemical vapor deposition (CVD) technology or a polymer infiltration pyrolysis (PIP) technology, and connecting ceramic fibers to obtain the ceramic fiber porous combustion medium with a gradient pore structure. The gradient pore structure makes a gas fuel be premixed in the upstream small pore zone and be combusted in the downstream large pore zone, so the combustion stability is improved, and the lean combustion limit is widened.

Description

technical field [0001] The invention belongs to a preparation method of porous ceramics, relates to a porous combustion medium material for production and daily use, in particular to a preparation method of a ceramic fiber porous combustion medium with a gradient pore structure. Background technique [0002] For a long time, the production and consumption of energy have driven the rapid development of industry and economy. But at the same time, in terms of energy utilization: on the one hand, there are problems such as low efficiency, serious waste, and environmental pollution; on the other hand, a large amount of low-grade energy has not been developed and utilized, especially the waste gas produced in industrial production. In industrial production, gaseous fuels have low calorific value and low combustion efficiency in the combustion process, which is difficult to be utilized by conventional combustion technologies, which not only causes energy waste, but also pollutes th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/583
CPCC04B35/583C04B35/806C04B2235/5224C04B2235/5232C04B2235/5244C04B2235/5256C04B2235/526C04B2235/5292C04B2235/614
Inventor 梅辉徐亚威张卉成来飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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