CN108905377A - A kind of preparation method of high temperature ultrafine dust filtering pipe - Google Patents
A kind of preparation method of high temperature ultrafine dust filtering pipe Download PDFInfo
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- CN108905377A CN108905377A CN201810794195.XA CN201810794195A CN108905377A CN 108905377 A CN108905377 A CN 108905377A CN 201810794195 A CN201810794195 A CN 201810794195A CN 108905377 A CN108905377 A CN 108905377A
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- high temperature
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- ultrafine dust
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
Abstract
The invention discloses a kind of preparation methods of high temperature ultrafine dust filtering pipe, including by percentage to the quality, silicon carbide 50~85%, cosmetic soil 5~30%, epoxy grease 5~30%, tekite sand 2~20%, waterglass 2~20%, preservative 0.05~3% are uniformly mixed, grinding obtains mixed powder, then slurry is mixed to get with deionized water, flow forming mode is used again, use frequency control swingle pressing materials, it forms material under pressure, is finally fired in stove through overlay film and obtain high temperature ultrafine dust filtering pipe.Preparation process of the present invention is easy to operate, reproducible, and uniformly, while preparation time is short, sintering temperature is low for mixing and reaction, the energy and at low cost, has good high-temperature oxidation resistance, suitable for filtering ultrafine dust under high temperature.
Description
Technical field
The invention belongs to dust-filtering pipe manufacturing technology fields, more particularly to a kind of system of high temperature ultrafine dust filtering pipe
Preparation Method.
Background technique
In the industries such as chemical industry, metallurgy, petroleum, electric power, a large amount of high-temperature dusty gas are usually given off, seriously polluted big
Compression ring border, while huge threat is also resulted in human health.On this basis, it needs to remove these high-temperature dusty gas
Dirt processing, reaches the standard of environment protection emission, reduces pollution.However under the high temperature conditions, fine grained coacervation is greatly lowered, right
The separation of particle has higher difficulty, and the engineering problems such as equipment material, structure type and thermal expansion used when high temperature are past
Toward the effective normal operation for influencing equipment.Therefore, how to carry out effective dedusting under the high temperature conditions is one with more highly difficult
Project.
It is greatly the purifying problem in order to solve high-temperature flue gas in high-temperature dust removal field, and China's atmosphere
Pollution is based on the pollution of bituminous coal type, therefore high-temperature dust removal technology has close contact with clean coal technology.It is traditional with coal
Based on thermal power generating technology not only efficiency of energy utilization is low, but also dust pollution is serious, brings serious threat to environment.Cause
This, energy utilization rate is high and almost without the novel thermal power generation system of dust emission, such as integrated gasification combined cycle plants
(IGCC), the clean coal power generations system such as pressurized fluidized bed combustion combined cycle (PFBC) has obtained the extensive blueness of scientific researchers
It looks at.Under the dual-pressure that energy demand growth and environmental pollution aggravate, developing clean coal technology will economize on resources and protection ring
Border is combined together, and is advantageously implemented the sustainable development of Chinese national economy.In these clean coal power generation systems, coal is through height
Temperature is gasificated as the raw gas containing a large amount of dust, and raw gas removes dust through high-temperature dust removal subsystem, then clean coal gas
It again can combustion power generation in the gas turbine after sulphur removal, nitrogen.If dust content will be exceeded in clean gas seriously to damage
The blade of bad gas turbine reduces the service life of gas turbine.Wherein, the developmental research of high-temperature dust removal technology is to implement Filter Tuber For Clean Coal skill
The advantageous guarantee of art.
The characteristics of hi-temp hi-effective dedusting technology is：The dusty gas temperature of required purification high (600-1400 DEG C), particle
Carefully (dp< 5-10 μm), high (exit concentration is required in 10-50mg/m purification standard3).It is remote using simple gas-solid separating device
The requirement of hi-temp hi-effective dedusting is far not achieved.Common dust removal method has wet dedusting, electrostatic precipitation, multi-tube dusting, high temperature
Dust removal by filtration etc..Wherein, high-temperature filter has bigger superiority in separative efficiency, and filtrate mainly uses particulate metal
And micropore ceramics.However the filtrate of high temperature resistant material is generally more costly, and is difficult to regeneration treatment after failing, and these filtrates exist
Under the conditions of high temperature, bad working environments dusty, filtrate will appear quickly damage, deformation, failure phenomena such as, there are operating costs
High, the problems such as working efficiency is low, constrain the industrial application of high-temperature filter.Therefore, novel high temperature filtration is developed
Device is a project in the urgent need to address in current high-temperature dust removal research.
Currently, scientific researchers are to Al both at home and abroad2O3The porous materials such as (corundum), MAS (cordierite), aluminium titanates remove
Dirt efficiency has carried out a series of researchs.Li Jianbao et al. is that main material is prepared for dust-filtering with porous with mullite fiber etc.
Ceramic filter tube (Chinese invention patent, ZL201010265544.2).Wu little Lin et al. proposes a kind of high temperature filtration pipe production
Device and production method (Chinese invention patent, ZL201310058575.4).But corundum thermal shock resistance difference and expensive, violet
The presence for the problems such as green stone is not corrosion-resistant, and mullite fiber is expensive causes these materials to be difficult to promote the use of.And silicon carbide
It is a kind of extremely strong compound of covalent keyness, there is good high temperature resistant and chemical corrosion resistance, and intensity is high, thermal shock resistance
Good, filtering accuracy height, long service life, can be used as the filter element of high-temperature dust removing device, are that other filtering materials can not replace
Generation, but due to the deficiency of current formula and sintering technology, cause the excellent properties of correlated product to be difficult to play completely.To mesh
Before until, the best performance parameter of domestic and international similar products is the porosity 38%, intensity 20MPa, therefore researches and develops high-intensitive, high stomata
The silicon carbide filters of rate, high uniformity, the performances such as low-resistance drop, corrosion-resistant, high temperature resistant are extremely urgent.
Summary of the invention
Goal of the invention：For the deficiency and defect of the existing technology of preparing of dust-filtering pipe, it is anti-that the present invention provides a kind of high temperature
The preparation method of the low high temperature ultrafine dust filtering pipe of oxidation, preparation cost.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：A kind of system of high temperature ultrafine dust filtering pipe
Preparation Method includes the following steps：
(1) in terms of mass fraction, by 50~85 parts of silicon carbide, 5~30 parts of cosmetic soils, 5~30 parts of epoxy greases, 2~20
Part tekite sand, 2~20 parts of waterglass, 0.05~3 portion of preservative are simultaneously uniformly mixed, and grinding obtains mixed powder；
(2) mixed powder that step (1) obtains is sufficiently mixed with the deionized water for accounting for mixed powder quality 5~15%
It is even, obtain slurry；
(3) slurry for obtaining step (2) is coated in mold, using flow forming mode, uses frequency control
Swingle pressing materials make material compression moulding under pressure；
(4) mullite film layer is coated on the dried material after molding for obtaining step (3).
(5) material that step (4) obtains is placed in stove, is fired under certain temperature, obtains final finished.
Preferably, in step (1), purity >=97% of the silicon carbide, granularity is 10~90 μm.
In step (1), purity >=90% of the cosmetic soil, granularity is 10~60 μm.
In step (1), purity >=98% of the epoxy grease.
In step (1), purity >=97% of the tekite sand, granularity is 3~50 μm.
In step (1), the modulus of water glass 1.5-3.5.
In step (1), the preservative pH 2-4.5.
In step (3), the actual conditions of the flow forming are：Frequency control swingle revolving speed is 10-60r/
Min, pressure 0.5-2MPa, dwell time 5-30s.
In step (4), the firing time is 12~15h, and sintering temperature is 1200~1500 DEG C.
The end properties for the high temperature ultrafine dust filtering pipe being prepared by means of the present invention meet following index：Gas
Porosity 41%, 28~31MPa of intensity, specific gravity 1.75.
The beneficial effects of the invention are as follows：Compared with prior art, the present invention provides it is a kind of it is easy to operate, reproducibility is high
The method for preparing high temperature ultrafine dust filtering pipe, by flow forming mode by mixing compression moulding, fire finally at
Product.This method is easy to operate, reproducibility is high, safe and reliable；Gained dust-filtering pipe have the ability of anti-ultrafine dust blocking with
The features such as excellent high-temperature oxidation resistance, antiacid caustic corrosion, skin resistance be low, high dust collection efficiency, long service life, application prospect
Widely.
Detailed description of the invention
Fig. 1 for embodiment 1 sample microstructure scanning electron microscopic picture.
Specific embodiment
Below by specific embodiment, the present invention will be described in detail.
Embodiment 1
High temperature ultrafine dust filtering pipe is prepared according to the following steps to obtain：
(1) in terms of mass fraction, by silicon carbide 55 parts of 25 parts of (its granularity is 90 μm, purity 97%), cosmetic soil (purity
>=93%, granularity be 40 μm), 8 parts of epoxy grease (purity >=98%), (purity >=97%, granularity are 6 parts of tekite sand
40 μm), 6 parts of waterglass (modulus 2.5), 0.05 part of preservative (pH 4) be uniformly mixed, be ground to partial size be 80 μm, mixed
Close powder；
(2) above-mentioned mixed powder is sufficiently mixed uniformly with the deionized water for accounting for mixed powder quality 15%, obtains slurry；
(3) above-mentioned slurry is coated in mold, using flow forming mode, is squeezed using frequency control swingle
Material makes material compression moulding under pressure；Wherein, the actual conditions of flow forming are：Frequency control rotation
Bar revolving speed is 20r/min, pressure 1.5MPa, dwell time 20S.
(4) by 20 μm of dried material film after molding,
(5) above-mentioned material is placed in stove, forms final finished in 1300 DEG C of sintering 12h.
The section electron microscope (Fig. 1) of obtained high temperature ultrafine dust filtering pipe, the results showed that the screen pipe is matched using novel
The product that side and moulding process generate has high intensity, high porosity, high uniformity, the performances such as low-resistance drop.Through detecting correlation
It can be as follows：The porosity 41%, 28~31MPa of intensity, specific gravity 1.75, fully meet the secondary filter of high temperature, high corrosion gas.
Embodiment 2
High temperature ultrafine dust filtering pipe is prepared according to the following steps to obtain：
(1) in terms of mass fraction, by silicon carbide 70 parts of 10 parts of (its granularity is 60 μm, purity 98%), cosmetic soil (purity
>=90%, granularity be 20 μm), 10 parts of epoxy grease (purity >=98%), (purity >=97%, granularity are 5 parts of tekite sand
20 μm), 5 parts of waterglass (modulus 3.5), 0.1 part of preservative (pH 2) be uniformly mixed, be ground to partial size be 50 μm, mixed
Powder；
(2) above-mentioned mixed powder is sufficiently mixed uniformly with the deionized water for accounting for mixed powder quality 12%, obtains slurry；
(3) above-mentioned slurry is coated in mold, using flow forming mode, is squeezed using frequency control swingle
Material makes material compression moulding under pressure；Wherein, the actual conditions of flow forming are：Frequency control rotation
Bar revolving speed is 50r/min, pressure 0.5MPa, dwell time 5s；
(4) by 20 μm of dried material film after molding；
(5) above-mentioned material is placed in stove, forms final finished in 1500 DEG C of sintering 15h.
By examples detailed above, obtained the high temperature ultrafine dust filtering pipe porosity 41%, 28~31MPa of intensity, specific gravity
1.75, show that the screen pipe has had preferable use value, can put into production.
Embodiment 3
High temperature ultrafine dust filtering pipe is prepared according to the following steps to obtain：
(1) in terms of mass fraction, by silicon carbide 50 parts of 25 parts of (its granularity is 50 μm, purity 99%), cosmetic soil (purity
>=90%, granularity be 60 μm), 10 parts of epoxy grease (purity >=98%), (purity >=97%, granularity are 8 parts of tekite sand
10 μm), 7 parts of waterglass (modulus 1.5), 0.5 part of preservative (pH 3) be uniformly mixed, be ground to partial size be 20 μm, mixed
Powder；
(2) above-mentioned mixed powder is sufficiently mixed uniformly with the water for accounting for mixed powder quality 8%, obtains slurry；
(3) above-mentioned slurry is coated in mold, using flow forming mode, is squeezed using frequency control swingle
Material makes material compression moulding under pressure；Wherein, the actual conditions of flow forming are：Frequency control rotation
Bar revolving speed is 30r/min, pressure 2MPa, dwell time 30s.
(4) by 20 μm of dried material film after molding；
(5) above-mentioned material is placed in stove, forms final finished in 1500 DEG C of sintering 15h.
By above-mentioned example, obtained the high temperature ultrafine dust filtering pipe porosity 41%, 28~31MPa of intensity, specific gravity
1.75, show that the screen pipe has had preferable use value, can put into production.
Embodiment 4
High temperature ultrafine dust filtering pipe is prepared according to the following steps to obtain：
(1) in terms of mass fraction, by silicon carbide 80 parts of 8 parts of (its granularity is 90 μm, purity 97%), cosmetic soil (purity
>=93%, granularity be 40 μm), 5 parts of epoxy grease (purity >=98%), (purity >=97%, granularity are 3 parts of tekite sand
40 μm), 4 parts of waterglass (modulus 2.5), 0.1 part of preservative (pH 4) be uniformly mixed, be ground to partial size be 80 μm, mixed
Powder；
(2) above-mentioned mixed powder is sufficiently mixed uniformly with the deionized water for accounting for mixed powder quality 15%, obtains slurry；
(3) above-mentioned slurry is coated in mold, using flow forming mode, is squeezed using frequency control swingle
Material makes material compression moulding under pressure；Wherein, the actual conditions of flow forming are：Frequency control rotation
Bar revolving speed is 20r/min, pressure 1.5MPa, dwell time 20S.
(4) by 20 μm of dried material film after molding,
(5) above-mentioned material is placed in stove, forms final finished in 1400 DEG C of sintering 13h.
The section electron microscope (Fig. 1) of obtained high temperature ultrafine dust filtering pipe, the results showed that the screen pipe is matched using novel
The product that side and moulding process generate has high intensity, high porosity, high uniformity, the performances such as low-resistance drop.Through detecting correlation
It can be as follows：The porosity 41%, 28~31MPa of intensity, specific gravity 1.75, fully meet the secondary filter of high temperature, high corrosion gas.
Claims (9)
1. a kind of preparation method of high temperature ultrafine dust filtering pipe, which is characterized in that include the following steps：
(1) in terms of mass fraction, 50~85 parts of silicon carbide, 5~30 parts of cosmetic soils, 5~30 parts of epoxy greases, 2~20 parts are melted
Fused silica sand, 2~20 parts of waterglass, 0.05~3 portion of preservative are simultaneously uniformly mixed, and grinding obtains mixed powder；
(2) mixed powder that step (1) obtains is sufficiently mixed uniformly with the deionized water for accounting for mixed powder quality 5~15%,
Obtain slurry；
(3) slurry for obtaining step (2) is coated in mold, using flow forming mode, is rotated using frequency control
Bar pressing materials make material compression moulding under pressure；
(4) dried material after molding that step (3) obtains is placed in stove, fires, is obtained finally under certain temperature
Finished product.
2. preparation method according to claim 1, which is characterized in that in step (1), the purity of the silicon carbide >=
97%, granularity is 10~90 μm.
3. preparation method according to claim 1, which is characterized in that in step (1), the purity of the cosmetic soil >=
90%, granularity is 10~60 μm.
4. preparation method according to claim 1, which is characterized in that in step (1), the purity of the epoxy grease >=
98%.
5. preparation method according to claim 1, which is characterized in that in step (1), the purity of the tekite sand >=
97%, granularity is 3~50 μm.
6. preparation method according to claim 1, which is characterized in that in step (1), the modulus of water glass 1.5-3.5.
7. preparation method according to claim 1, which is characterized in that in step (1), the preservative pH is 2-4.5.
8. preparation method according to claim 1, which is characterized in that in step (3), the flow forming it is specific
Condition is：Frequency control swingle revolving speed is 10-60r/min, pressure 0.5-2MPa, dwell time 5-30s.
9. preparation method according to claim 1, which is characterized in that in step (4), the firing time is 12~15h, sintering
Temperature is 1200~1500 DEG C.
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| CN201810794195.XA CN108905377B (en) | 2018-07-19 | 2018-07-19 | Preparation method of high-temperature ultrafine dust filter tube |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6155432A (en) * | 1999-02-05 | 2000-12-05 | Hitco Carbon Composites, Inc. | High performance filters based on inorganic fibers and inorganic fiber whiskers |
| US6214078B1 (en) * | 1997-11-25 | 2001-04-10 | Ferro Corporation | High temperature ceramic filter |
| US20100071328A1 (en) * | 2007-01-29 | 2010-03-25 | Saint-Gobain Centre De Recherches Et D'etudes Eur. | Method for making a sic based ceramic porous body |
| CN102964124A (en) * | 2011-01-07 | 2013-03-13 | 宜兴市鑫帝豪高科陶瓷厂 | High-temperature gas-solid ceramic filter tube and preparation method |
| CN103111132A (en) * | 2013-02-25 | 2013-05-22 | 中国石油大学(北京) | Filtering tube applied to high-temperature gas filtration, and manufacturing device and method of filtering tube |
| CN103566778A (en) * | 2012-07-27 | 2014-02-12 | 佛山市南海区西樵金刚科技有限公司 | Inorganic film tube and making method thereof |
| CN105000906A (en) * | 2015-06-24 | 2015-10-28 | 左然 | Pressurelessly-sintered silicon carbide foamed ceramic and preparation method thereof |
| WO2016052461A1 (en) * | 2014-09-29 | 2016-04-07 | イビデン株式会社 | Method for producing honeycomb filter |
| CN106380224A (en) * | 2016-09-19 | 2017-02-08 | 南京工业大学 | Preparation method of silicon carbide porous ceramic for filtering high-temperature fume |
| CN107469641A (en) * | 2017-08-24 | 2017-12-15 | 江苏亚峰科技集团有限公司 | A kind of filtering inoranic membrane |
-
2018
- 2018-07-19 CN CN201810794195.XA patent/CN108905377B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6214078B1 (en) * | 1997-11-25 | 2001-04-10 | Ferro Corporation | High temperature ceramic filter |
| US6155432A (en) * | 1999-02-05 | 2000-12-05 | Hitco Carbon Composites, Inc. | High performance filters based on inorganic fibers and inorganic fiber whiskers |
| US20100071328A1 (en) * | 2007-01-29 | 2010-03-25 | Saint-Gobain Centre De Recherches Et D'etudes Eur. | Method for making a sic based ceramic porous body |
| CN102964124A (en) * | 2011-01-07 | 2013-03-13 | 宜兴市鑫帝豪高科陶瓷厂 | High-temperature gas-solid ceramic filter tube and preparation method |
| CN103566778A (en) * | 2012-07-27 | 2014-02-12 | 佛山市南海区西樵金刚科技有限公司 | Inorganic film tube and making method thereof |
| CN103111132A (en) * | 2013-02-25 | 2013-05-22 | 中国石油大学(北京) | Filtering tube applied to high-temperature gas filtration, and manufacturing device and method of filtering tube |
| WO2016052461A1 (en) * | 2014-09-29 | 2016-04-07 | イビデン株式会社 | Method for producing honeycomb filter |
| CN105000906A (en) * | 2015-06-24 | 2015-10-28 | 左然 | Pressurelessly-sintered silicon carbide foamed ceramic and preparation method thereof |
| CN106380224A (en) * | 2016-09-19 | 2017-02-08 | 南京工业大学 | Preparation method of silicon carbide porous ceramic for filtering high-temperature fume |
| CN107469641A (en) * | 2017-08-24 | 2017-12-15 | 江苏亚峰科技集团有限公司 | A kind of filtering inoranic membrane |
Non-Patent Citations (5)
| Title |
|---|
| 侯华: "《液态成型工艺及CAD》", 30 November 2012 * |
| 刘红军: "《日照地区龙山文化》", 30 June 2006, 山东友谊出版社 * |
| 孙智: "《材料概论》", 30 November 2008, 中国矿业大学出版社 * |
| 时钧，袁权，高从阶: "《膜技术手册》", 31 January 2001 * |
| 汪多仁: "《绿色增塑剂》", 31 October 2011 * |
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Inventor after: Gu Yiping Inventor after: Cui Yongjie Inventor after: Zhou Cheng Inventor after: Xu Xueliang Inventor before: Gu Yiping Inventor before: Wu Yaping Inventor before: Cui Yongjie Inventor before: Zhou Cheng Inventor before: Xu Xueliang |
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