A kind of high-temperature dusty gas separation porous material and preparation method thereof

A technology for gas separation and porous materials, which is applied in the preparation of porous materials and the preparation of porous nickel-based alloy materials for separation of high-temperature dust-laden gases. Reliability, low mechanical strength and other issues, achieve high mechanical strength, improve anti-stripping performance, and ensure the effect of anti-corrosion performance

Active Publication Date: 2019-09-17
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Invention patent CN102895809A discloses a ceramic filter device and its preparation method. The filter material in the ceramic filter device is composed of loose ceramic microsphere particles. A single ceramic microsphere particle has an interconnected pore structure, and its spherical particle structure It has good structural stability and avoids the shortcomings of existing porous ceramic materials such as low mechanical strength, difficulty in processing, and easy cracks
Ceramic filters can withstand temperatures up to about 1000°C and have good corrosion resistance. However, periodic backflushing vibrations are required during the high-temperature gas separation process. The thermal brittleness of the ceramic itself, combined with poor thermal shock resistance and pressure shock strength, The reliability of the porous filter material in use cannot be guaranteed

Method used

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  • A kind of high-temperature dusty gas separation porous material and preparation method thereof
  • A kind of high-temperature dusty gas separation porous material and preparation method thereof
  • A kind of high-temperature dusty gas separation porous material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Four kinds of powders of Ni, Cr, Al and Y are prepared according to the proportion, wherein the Ni content is 79.5wt%, the powder particle size is 350 mesh; the Cr content is 15wt%, the powder particle size is 350 mesh; the Al content is 5wt%, The particle size of the powder is 350 mesh; the Y content is 0.5 wt%, and the particle size of the powder is 300 mesh. Put the prepared powder on a V-type powder mixer and mix it at a constant speed for 8 hours, then add 3% stearic acid of the total powder mass, dry it in a common drying oven at 35°C for 12 hours, and cold press it at a pressure of 50 MPa. The holding time is about for 90s; place the green compact in a vacuum sintering furnace for sintering with a vacuum degree of 5×10 -3 Pa; the sintering process is: maintain a heating rate of 5°C / min from room temperature to 60°C, and hold for 120 minutes; then raise the temperature to 300°C at a heating rate of 3°C / min, and hold for 120 minutes; Raise the temperature to 550°C...

Embodiment 2

[0028] The four powders of Ni, Cr, Al and Y are prepared in proportion, wherein the Ni content is 53wt%, the powder particle size is 150 mesh; the Cr content is 25wt%, the powder particle size is 150 mesh; the Al content is 20wt%, the powder The particle size is 150 mesh; the Y content is 2wt%, and the powder particle size is 200 mesh. Put the prepared powder on a V-type powder mixer and mix it at a constant speed for 14 hours, then add 2% stearic acid of the total powder mass, dry it in a common drying oven at 55°C for 6 hours, and cold press it at a pressure of 150 MPa. The holding time is about for 30s; put the compact in a vacuum sintering furnace for sintering, the vacuum degree is 1×10 -2 Pa; the sintering process is: keep the temperature rise rate of 7°C / min from room temperature to 100°C, and keep it for 100min; The temperature was raised to 650°C at a speed of 180 minutes; finally, the temperature was raised to 1300°C at a heating rate of 7°C / min, and the heat was he...

Embodiment 3

[0030] Mix Ni, Cr, Al, and Y four kinds of powders in proportion, wherein the Ni content is 69wt%, the powder particle size is 275 mesh; the Cr content is 20wt%, the powder particle size is 275 mesh; the Al content is 10wt%, the powder The particle size is 275 mesh; the Y content is 1 wt%, and the powder particle size is 250 mesh. Put the prepared powder on a V-type powder mixer and mix it at a constant speed for 10 hours, then add 1% stearic acid of the total powder mass, and then dry it in an ordinary drying oven at 50°C for 8 hours, and cold press it at a pressure of 100 MPa. The holding time is about for 50s; put the compact in a vacuum sintering furnace for sintering, the vacuum degree is 8×10 -3 Pa; the sintering process is: keep the temperature rise rate of 10°C / min from room temperature to 80°C, and keep it for 90 minutes; then raise the temperature to 350°C at a rate of 6°C / min, keep it for 90 minutes; The temperature was raised to 600°C at a speed of 200 minutes; fi...

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Abstract

The invention discloses a preparation method of a high-temperature dust-containing gas separation porous material. The preparation method mainly comprises the following steps: (1) mixing powder: completely mixing 53 to 79.5 percent by mass of high-purity Ni powder, 15 to 25 percent by mass of high-purity Cr powder, 5 to 20 percent by mass of high-purity Al powder, and 0.5 to 2 percent by mass of high-purity Y powder; (2) performing cold-press molding: pelletizing and drying the mixed powder and performing cold-press molding to obtain green bodies; (3) performing four-stage sintering on the green bodies in a vacuum sintering furnace. The Ni-Cr-Al-Y porous alloy prepared by vacuum sintering reaction synthesis of element powder is rich and uniform in internal pore, high in open porosity and high in filtering efficiency, has excellent high-temperature resistance, oxidation resistance, thermal shock resistance and corrosion resistance, high mechanical strength and weldability, and is convenient to process. The service life of filtering components is prolonged effectively while the filtering precision is improved and the filtering stability is guaranteed.

Description

technical field [0001] The invention relates to a preparation method of a porous material, in particular to a preparation method of a high-temperature dust-containing gas separation porous nickel-based alloy material synthesized by element powder vacuum sintering reaction, and belongs to the technical field of air pollution control and dust removal. Background technique [0002] High-temperature gas filtration and dust removal technology can maximize the use of physical sensible heat and chemical latent heat of the gas, improve energy utilization, simplify the process, and save equipment investment; secondary water pollution. Therefore, rational use of this technology has very huge economic value and social benefits. High-temperature filters generally adopt the method of pulse back-blowing and dust removal to realize the cyclic regeneration of filter elements, which must meet the following three performance requirements: (1) Good thermal shock resistance and mechanical stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/08B22F3/11B01D39/20B01D46/00
Inventor 肖逸锋徐阳吴靓许艳飞钱锦文郭小花李晓娜曾灿
Owner XIANGTAN UNIV
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