Preparation method of high-precision metal fiber felt for high-temperature gas dust removal

A technology of metal fiber felt and high-temperature gas, applied in the field of non-woven fabrics, can solve the problems of fiber mechanical properties, decreased folding resistance, poor bonding force of the felt layer, and difficult formation, etc., to achieve good mechanical properties and folding resistance, Not easy to break and short heat preservation time

Active Publication Date: 2020-08-04
西安菲尔特金属过滤材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The metal fiber mat prepared by the traditional sintering process is prone to grain coarsening and "bamboo-like" morphology, which significantly reduces the mechanical properties and folding resistance of the fiber; the sintering temperature and The holding time is different, so it is difficult to form a welding point of a certain size between the fibers, resulting in poor bonding of the felt layer

Method used

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  • Preparation method of high-precision metal fiber felt for high-temperature gas dust removal
  • Preparation method of high-precision metal fiber felt for high-temperature gas dust removal
  • Preparation method of high-precision metal fiber felt for high-temperature gas dust removal

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Embodiment 1

[0037] The preparation method of the high-precision metal fiber felt for high-temperature gas dedusting of the present invention is specifically implemented according to the following steps:

[0038] Step 1. Use felting equipment to pave the crude fiber into a coarse fiber mat, then check the uniformity of the coarse fiber mat at the light inspection station, take out the uniform coarse fiber mat, and set aside;

[0039] Among them, the diameter of the thick fiber is 22μm, and the unit weight is 600g / m 2 .

[0040] Step 2, using a high-temperature vacuum furnace to carry out vacuum high-temperature sintering treatment on the crude fiber felt blank, and obtain a coarse fiber sintered felt after cooling down, and set aside;

[0041] Among them, the temperature of vacuum high-temperature sintering treatment is 1100°C, the holding time is 120min, and the vacuum degree is 7.0×10 - 2 Pa, the gas quenching temperature is 750°C, and the high temperature vacuum furnace is filled wit...

Embodiment 2

[0049] The preparation method of the high-precision metal fiber felt for high-temperature gas dedusting of the present invention is specifically implemented according to the following steps:

[0050] Step 1. Use felting equipment to pave the crude fiber into a coarse fiber mat, then check the uniformity of the coarse fiber mat at the light inspection station, take out the uniform coarse fiber mat, and set aside;

[0051] Among them, the diameter of the thick fiber is 30μm, and the unit weight is 1200g / m 2 .

[0052] Step 2, using a high-temperature vacuum furnace to carry out vacuum high-temperature sintering treatment on the crude fiber felt blank, and obtain a coarse fiber sintered felt after cooling down, and set aside;

[0053] Among them, the temperature of vacuum high-temperature sintering treatment is 1200°C, the holding time is 150min, and the vacuum degree is 7.0×10 - 2 Pa, the gas quenching temperature is 800°C, and the high temperature vacuum furnace is filled wi...

Embodiment 3

[0061] The preparation method of the high-precision metal fiber felt for high-temperature gas dedusting of the present invention is specifically implemented according to the following steps:

[0062] Step 1. Use felting equipment to pave the crude fiber into a coarse fiber mat, then check the uniformity of the coarse fiber mat at the light inspection station, take out the uniform coarse fiber mat, and set aside;

[0063] Among them, the diameter of the thick fiber is 35μm, and the unit weight is 1500g / m 2 .

[0064] Step 2, using a high-temperature vacuum furnace to carry out vacuum high-temperature sintering treatment on the crude fiber felt blank, and obtain a coarse fiber sintered felt after cooling down, and set aside;

[0065] Among them, the temperature of vacuum high-temperature sintering treatment is 1300°C, the holding time is 180min, and the vacuum degree is 7.0×10 - 2 Pa, the gas quenching temperature is 700°C, and the high temperature vacuum furnace is filled wi...

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Abstract

The invention discloses a preparation method of a high-precision metal fibrofelt for high-temperature gas dust removal. The preparation method comprises the following steps: firstly, paving crude fibers into a crude fibrofelt blank by adopting felt paving equipment; performing vacuum high-temperature sintering treatment on the crude fibrofelt blank by adopting a high-temperature vacuum furnace, and cooling to obtain a crude fiber sintered felt; paving superfine fibers into a superfine fibrofelt blank by adopting the felt paving equipment, and then flattening the superfine fibrofelt blank by adopting a flattening machine so as to obtain a flat superfine fibrofelt blank; stacking the flat superfine fibrofelt blank and the crude fiber sintered felt, covering the surface of an obtained felt with a non-metal high-temperature-resistant material, then feeding an obtained felt blank into a high-temperature vacuum furnace for vacuum high-temperature sintering treatment, taking out the felt blank after cooling, and flattening the felt blank to obtain the high-precision metal fibrofelt. The high-precision metal fibrofelt prepared by the method is good in mechanical property, folding resistance and binding force of felt layers.

Description

technical field [0001] The invention relates to the technical field of nonwoven fabrics, in particular to a preparation method of a high-precision metal fiber felt for high-temperature gas dust removal. Background technique [0002] The unique high temperature resistance of metal fiber felt is applied to the purification of high temperature dusty gas, and the remaining heat can be recovered, which saves energy and has no secondary pollution. Therefore, it is widely used in high-temperature fields such as coal-fired boiler flue gas dust removal, precious metal recovery, and metallurgical industry dust removal. [0003] The filter material for high-temperature gas dust removal uses ultra-fine fibers as the windward side of the metal fiber felt filter material, combined with fibers with thicker diameters as the support layer, which can form a structure with gradient pore sizes from small to large in the thickness direction of the filter material; The fiber layer can block most...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/20
CPCB01D39/2044
Inventor 康彦侯力强张小庆卢文静王磊李明路晓锋李凯凯彭海军阳清郭亮呼伟
Owner 西安菲尔特金属过滤材料股份有限公司
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