CN100425320C - Method of preparing iron-aluminum based metal compound microporous filter element, and its application - Google Patents
Method of preparing iron-aluminum based metal compound microporous filter element, and its application Download PDFInfo
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- CN100425320C CN100425320C CNB2006100575381A CN200610057538A CN100425320C CN 100425320 C CN100425320 C CN 100425320C CN B2006100575381 A CNB2006100575381 A CN B2006100575381A CN 200610057538 A CN200610057538 A CN 200610057538A CN 100425320 C CN100425320 C CN 100425320C
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Abstract
The present invention relates to a preparation method and a purpose of a metal micropore filtering element which is applied to the purifying, filtering and dust removing technology or a system of high-temperature gas containing corrosive components, which belongs to the field of powder metallurgy preparation. The method comprises the following steps: raw material is put in a vacuum smelting furnace for smelting; smelted Fe3Al is pulverized by high-pressure water atomizing technology, and atomizing water pressure is larger than 8MPa; Fe3Al intermetallic compound powder prepared by atomizing high-pressure water is sieved into different levels by a standard sieve; raw material powder is formed once by isostatic pressing/compression moulding forming technology, pressure is 100 to 300MPa, pressure maintaining time is 10 to 30 min, vacuum sintering technology is adopted after demoulding, sintering temperature is 1100 to 1350 DEG C, temperature maintaining time is 1 to 5 h, and vacuum degree is smaller than 9.0*10<-3>torr. Compared with the prior art, the present invention has the advantage of high intensity, excellent high-temperature oxidation resistance, excellent sulfur corrosion resistant performance, high filtration efficiency, low running resistance, stable technology, easy reverse blow, cleaning and regeneration, long service life and energy saving.
Description
Technical field
The invention belongs to field of powder metallurgy preparation, the Preparation method and use of used iron-aluminum based metal compound microporous filter element in particularly a kind of purification filtering of the high-temperature gas (coal gas, combustion gas, flue gas etc.) that is applied to contain corrosive component such as aerobic/sulfur dioxide/hydrogen sulfide and dust collecting process or the system.
Background technology
Fe
3The Al base intermetallic compound is because its good hear resistance, good mechanical performance and excellent high-temperature oxidation resistant and kinds of anti-sulfur corrosion performance have been subjected to more and more many concern and the application studies of countries in the world investigation of materials worker in recent years.Wherein, development that important research and development are high temperature porous filter materials.In the modern industry production process, the field that relates to dusty gas direct purification dedusting at high temperature and application is very extensive, comprises the energy, petrochemical industry, metallurgy, electric power, chemical industry, glass industry and environmental protection field etc.Hot industry gas contains a large amount of physics heat, potential chemical heat and available material, and as solid catalyst, its reasonable utilization has very huge economic.Be accompanied by the development of industrial technology and improving constantly of environmental protection requirement; the development of gas cleaning at high temperature technology comes into one's own more; especially round the industrialization of clean coal power generation technology; comprise the clean combustion combined cycle generation technology (IGCC) and the supercharging sulfuration bed coal fired power generation technology (PFBC) of coal, various countries have carried out the research of a large amount of gas cleaning at high temperature technology and critical material.The core of gas cleaning at high temperature technology is the high-performance filtering material.There are problems such as thermal shock resistance is bad, reliability is not high in later stage nineteen nineties at ceramic filter material, and some countries of west have carried out the research and development of advanced metal porous filtering material.Fe
3Al base alloy material resistance to high temperature oxidation and sulfur corrosion resistant performance are outstanding, are suitable for working under high temperature corrosive environments such as IGCC, PFBC electricity generation system.Yet, Fe
3The Al material is also effectively used at present, and most important reason is that its temperature-room type plasticity is not high, fragility is bigger, thereby makes processing difficulties.Adopt powder metallurgy process can directly obtain the Fe of desired structure
3Al sintered powder material solves processing problems.Mostly being of report adopts mechanical alloying to obtain Fe at present
3After the Al raw meal, carry out pressure sintering and obtain Fe
3The Al dense material.
Summary of the invention
The object of the present invention is to provide a kind of preparation intensity height, high temperature oxidation resistance and kinds of anti-sulfur corrosion excellent performance, filter efficiency height, running resistance are low, process stabilizing, be easy to the method and the purposes of long, the energy-conservation iron-aluminum based metal compound microporous filter element of blowback cleaning and regeneration, life-span.
According to above-mentioned purpose, the technical solution used in the present invention is:
At first adopt industrial pure material iron, aluminium and other trace alloying element to add in the vaccum sensitive stove and carry out melting with certain percentage by weight, adopt the powder process of high-pressure water mist metallization processes then, made powder carries out after the classification by mould and through isostatic cool pressing/mold pressing straight forming, carry out vacuum-sintering after the demoulding, finally be prepared into the Fe of tubulose and other shape
3Al sintered powder microporous element.
According to above-mentioned purpose and whole technical scheme, the concrete technical scheme of the present invention is:
It is Al:10～20% that the chemical composition of the raw material iron-aluminum based metal compound that this method is used is formed weight %, Cr:1.5～6.0%, B:0.01～0.05%, Zr:0.05～0.25%, surplus is Fe, this method comprise vacuum melting, hydraulic atomized powder process, powder classification, etc. static pressure/compression molding and 5 steps of vacuum-sintering, specific as follows:
A, vacuum melting
Above-mentioned ready raw material is dropped into melting in the vacuum smelting furnace, and as deoxidier, smelting temperature is between 1500～1800 ℃ with aluminium, and smelting time is 3～10 minutes;
B, hydraulic atomized powder process
After the melting, adopt the powder process of high-pressure water mist metallization processes, atomizing hydraulic pressure＞8MPa, and, reduce the oxygen content of powder, 0＜0.3% by adjusting fusion temperature and slagging process;
C, powder classification
The mixing Fe of hydraulic atomized preparation
3The Al intermetallic compound powder passes through standard screen, sieves to be following rank :-60 orders+100 orders ,-the 100+150 order ,-150+200 order and-200 orders;
D, etc. static pressure/compression molding
According to Fe
3The net shape of Al powder filter element designs corresponding mould, and the proper raw material powder is adorned than 1.30～1.70g/cm with pine
3After inserting mould, static pressure/die press technology for forming one-shot formings such as employing, pressure 100～300MPa, dwell time 10～30min, the uniformity of assurance poromerics density;
E, vacuum-sintering
After the demoulding, adopt vacuum sintering technology, 1100～1350 ℃ of sintering temperatures, temperature retention time 1～5h, vacuum＜9.0 * 10
-3Holder.
The iron-aluminium alloy microporous filter element that said method is made is applied to contain in the purification filtering and dust collecting process or system of high-temperature gas (coal gas, combustion gas, flue gas etc.) of corrosive component such as aerobic/sulfur dioxide/hydrogen sulfide.
Compared with prior art, the Fe of the present invention's preparation
3Al base intermetallic compound sintered powder microporous filter element, be applied in the dust removal and filtration of corrosivity mists such as 300-750 ℃ of high-temperature oxydation, sulfuration, has the intensity height, high temperature oxidation resistance and kinds of anti-sulfur corrosion excellent performance, filter efficiency height, running resistance are low, process stabilizing, be easy to blowback cleaning and regeneration, life-span long, energy-conservation advantage, specific as follows:
1, the Fe of the present invention's preparation
3Al intermetallic compound sintered powder microporous filter element, pressing process has guaranteed the uniformity of poromerics density, adopts vacuum sintering technology in addition, makes filter material have good overall characteristic at aspects such as hole characteristic, intensity, toughness;
2, the Fe of the present invention's preparation
3Al base intermetallic compound sintered powder microporous filter element, be applied in the udst separation of 300-750 ℃ of high-temperature oxydation and corrosivity dusty gas, filter efficiency height not only, running resistance is low, stable technical process be easy to the blowback cleaning and regeneration, and anti-corrosion effects is remarkable, the long-time use can be because of plug-hole or pass variation take place in corrosion yet, and improve service life greatly;
3, the Fe of the present invention's preparation
3Al base intermetallic compound sintered powder microporous filter element is in dust removal and filtration is used, because the high temperature of ability up to 750 ℃, and the intensity height, it is big to bear pressure reduction, can adapt to than rugged environment, thereby can save a large amount of sensible heats energy and pressure energy.
The specific embodiment
Adopt method of the present invention to prepare Fe
3Three batches of Al base intermetallic compound sintered powder microporous filter elements.Three crowdes of raw materials used Fe
3The chemical composition of Al intermetallic compound sees Table 1, and preparation method's process system and parameter, dimensions see Table 2, the Fe of preparation
3The hole characteristic of Al base intermetallic compound sintered powder microporous filter element sees Table 3.Above-mentioned three crowdes of Fe
3Al base intermetallic compound sintered powder microporous filter element is applied in the cement kiln high-temperature flue gas dust removal filter, and the performance indications that showed see Table 4.The test environment of these performance indications is a cement kiln head height temperature ash-laden gas, and working condition is as follows:
Flue-gas temperature: 200-500 ℃;
Flue gas pressures: normal pressure;
Smoke components: CO
2, N
2, O
2, CO, H
2O;
Dust contained flue gas concentration: 300-1500mg/Nm
3
In the above-mentioned tabulation, 1-3# is the embodiment of the invention.
The raw materials used Fe of table 1 embodiment of the invention
3The chemical component table wt% of Al intermetallic compound
The preparation method's that table 2 embodiment of the invention is adopted processing step and technological parameter, dimensions table
The Fe of table 3 the present invention preparation
3Al metal compound microporous filter element hole property list
Claims (2)
1, a kind of preparation method of iron-aluminum based metal compound microporous filter element, it is Al:10～20%, Cr:1.5～6.0%, B:0.01～0.05%, Zr:0.05～0.25% that the chemical composition of the raw materials used iron-aluminum based metal compound of this method is formed weight %, surplus is Fe, this method comprise vacuum melting, hydraulic atomized powder process, powder classification, etc. static pressure or compression molding and 5 steps of vacuum-sintering, it is characterized in that the concrete steps of said method are as follows:
A, vacuum melting
Above-mentioned ready raw material is dropped into melting in the vacuum smelting furnace, and aluminium is as deoxidier, and smelting temperature is between 1500～1800 ℃, and smelting time is 3～10 minutes;
B, hydraulic atomized powder process
With the Fe after the melting
3Al adopts the powder process of high-pressure water mist metallization processes, atomizing hydraulic pressure 8-12MPa, and, reduce the oxygen content of powder, oxygen content＜0.3% by adjusting fusion temperature and slagging process;
C, powder classification
The Fe of hydraulic atomized preparation
3The Al intermetallic compound powder passes through standard screen, sieves to be following rank :-60 orders+100 orders ,-the 100+150 order ,-150+200 order and-200 orders;
D, etc. static pressure or compression molding
According to Fe
3The net shape of Al powder filter element designs corresponding mould, and above-mentioned other material powder of different meshes level is adorned than 1.30～1.70g/cm with pine respectively
3After inserting mould, employing waits static pressure or die press technology for forming one-shot forming, and pressure is 100～300MPa, and the dwell time is 10～30min;
E, vacuum-sintering
After the demoulding, adopt vacuum sintering technology, sintering temperature is 1100～1350 ℃, and temperature retention time is 1～5h, vacuum＜9.0 * 10
-3Holder.
2,, it is characterized in that iron-aluminum based metal compound microporous filter element is applied to contain in the purification filtering and dust collecting process or system of high-temperature gas of aerobic and/or sulfur dioxide and/or hydrogen sulfide corrosion component according to the iron-aluminum based metal compound microporous filter element of the described preparation method of claim 1 preparation.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101838752B (en) * | 2009-04-22 | 2011-10-05 | 李玉清 | Method for preparing iron aluminum intermetallic compound homogenizing cellular material by utilizing powder raw materials |
| CN101890500B (en) * | 2010-07-14 | 2012-04-25 | 安泰科技股份有限公司 | Method for preparing double-layer sintering metal powder filter element |
| CN102000457B (en) * | 2010-10-12 | 2013-12-04 | 广州海辰过滤技术有限公司 | Fe3Al intermetallic compound filter element and pre-oxidization treatment method and application thereof |
| BR112013015200A2 (en) * | 2010-12-15 | 2017-06-27 | Gkn Sinter Metals Llc | improved aluminum alloy powder metal with transition elements |
| CN105195752B (en) * | 2015-09-07 | 2017-07-18 | 内蒙古科技大学 | A kind of method for preparing acieral powder material |
| CN107158811A (en) * | 2017-04-14 | 2017-09-15 | 西安电子科技大学 | A kind of filter element preparation method applied to coal liquifaction product gas solid separation |
| CN107299286A (en) * | 2017-05-31 | 2017-10-27 | 成都小柑科技有限公司 | A kind of inorganic nano-particle strengthens ferroalloy composite |
| CN108079666A (en) * | 2017-11-17 | 2018-05-29 | 安泰环境工程技术有限公司 | A kind of low-resistance drop filtering material and preparation method thereof |
| CN110125392B (en) * | 2019-06-28 | 2022-02-15 | 安泰环境工程技术有限公司 | High-flux external light Fe-Al intermetallic compound filter element and preparation method thereof |
| CN111069590A (en) * | 2020-01-10 | 2020-04-28 | 安泰环境工程技术有限公司 | Gradient composite iron-aluminum-based intermetallic compound microporous filter material and preparation method thereof |
| CN111098051B (en) * | 2020-01-10 | 2024-02-09 | 安泰环境工程技术有限公司 | Iron-aluminum-based intermetallic compound filter element and preparation method thereof |
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