CN102276239B - Heat exchanger ceramic material for bulk tobacco flue-curing house and preparation method thereof - Google Patents
Heat exchanger ceramic material for bulk tobacco flue-curing house and preparation method thereof Download PDFInfo
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- CN102276239B CN102276239B CN 201110139597 CN201110139597A CN102276239B CN 102276239 B CN102276239 B CN 102276239B CN 201110139597 CN201110139597 CN 201110139597 CN 201110139597 A CN201110139597 A CN 201110139597A CN 102276239 B CN102276239 B CN 102276239B
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Abstract
The invention relates to a heat exchanger ceramic material for a bulk tobacco flue-curing house and a preparation method thereof. A heat exchanger ceramic material for a bulk tobacco flue-curing house is characterized in that the material is made from the following components of: by weight, 64.25-75% of a batch material, 24.25-35% of water and 0.75-1.25% of a dispersant. The batch material contains the following raw materials of, by weight, 10-23% of Yuan'an clay, 33-50% of bauxitic clay, 34-42% of knar clay, 1-3% of wollastonite and 5-8% of talcum. The heat exchanger ceramic material has high strength, high density, high thermal conductivity and good thermal shock resistance.
Description
Technical field
The present invention relates to a kind of heat exchanger ceramic material for bulk tobacco flue-curing house and preparation method thereof.
Background technology
Bulk curing barn will be popularized in an all-round way as the advanced form that reaches at present following tobacco flue-curing, and the whole nation will reach 810,000 scales in 3 years.China's dense tobacco flue-curing house mainly adopts the relatively poor steel heat exchanger of erosion resistance at present, and fuel is mainly coal, and the sulfur-containing smoke gas heat exchanger corrosion that produces behind the coal combustion is very serious, so the work-ing life of steel heat exchanger is shorter.And if adopt acid-resistant alloy steel interchanger, then it is expensive, so that the flue-cured tobacco comprehensive cost greatly promotes.The high temperature creep property of metallic recuperator is relatively poor, this also so that the high temperature section flue gas heat can't obtain utilizing, thereby reduced thermo-efficiency.
The existing report that uses as heat exchanger materials of silicon carbide, silicon nitride and boron nitride in the stupalith, but its raw materials cost is high, sintering temperature is high, moulding is complicated, production unit is required high, present stage China's economic and technique level still can't carry out use of large-scale production in the lower situation.
Alumina-ceramic is a kind of material that has been widely used, and people understand its microtexture and production technique very much, although its thermal conductivity is lower than the potteries such as silicon carbide, also is lower than metallic substance, and alumina-ceramic has its unique advantage.The potteries such as relative silicon carbide, its raw material sources are extensive, and are with low cost, and moulding is simple, and firing temperature is low; Relative metallic substance, its chemical stability is good, and the antioxidant anticorrosive ability is strong, so the maintenance management cost is low, and excellent high temperature creep property be so that it can take full advantage of the high temperature section flue gas heat, thereby greatly improved heating efficiency.
Alumina-ceramic is that its thermal shock resistance is poor as the shortcoming of interchanger, but this can remedy by the material of introducing low bulk, Heat stability is good.The trichroite thermal expansivity is 2.04 * 10
-6(20～800 ℃), thermal shock resistance are very good, be a kind of good anti-thermal shock material, but industrial trichroite price are higher, utilize the synthetic cost of natural mineral lower.
Summary of the invention
The purpose of this invention is to provide a kind of heat exchanger ceramic material for bulk tobacco flue-curing house and preparation method thereof, this interchanger stupalith has the advantages that intensity height, density are high, thermal conductivity is high, thermal shock resistance is good.
For achieving the above object, the technical solution used in the present invention is: a kind of heat exchanger ceramic material for bulk tobacco flue-curing house, it is characterized in that it is prepared from by admixtion, water and dispersion agent, the shared mass percent of each component is: admixtion 64.25～75%, water 24.25～35%, dispersion agent 0.75～1.25%;
Described admixtion comprises Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum, and the shared mass percent of each raw material is in the admixtion: Yuanan soil 10～23%, bauxitic clay 33～50%, camwood knag 34～42%, wollastonite 1～3%, talcum 5～8%.
Described Yuanan soil is the soil of Yuanan County, Hubei Province.
Described dispersion agent is hexa metaphosphoric acid.
The preparation method of above-mentioned a kind of heat exchanger ceramic material for bulk tobacco flue-curing house is characterized in that it comprises the steps:
1) preparation of admixtion: be by the shared mass percent of each raw material in the admixtion: Yuanan soil 10～23%, bauxitic clay 33～50%, camwood knag 34～42%, wollastonite 1～3%, talcum 5～8%, choose Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum;
It is thin that Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum are all added water mill through ball mill respectively, crosses 300 mesh sieves after the oven dry, then mixes, and obtains admixtion;
2) preparation of slurry: be by the shared mass percent of each component: admixtion 64.25～75%, water 24.25～35%, dispersion agent 0.75～1.25%, choose admixtion, water and dispersion agent; Admixtion is added water and dispersion agent ball milling 3～5 hours in ball mill, obtain slurry;
3) moulding: ball milling mixes complete, behind old 24 hours of the slurry, slurry after old is injected gypsum mold carry out injection forming (the control slurry obtains the goods of definite shape), treat that the gypsum mold midge is complete, base substrate water ratio in the gypsum mold is lower than the 20% rear demoulding, obtains the base substrate after the demoulding;
4) drying: place kiln in 80～100 ℃ of dryings of constant temperature 12 hours, the base substrate after obtaining drying the base substrate after the demoulding;
5) burn till: the base substrate after will drying adopts oxydizing flame to burn till in tunnel furnace, 1150～1300 ℃ of firing temperatures, and firing period 9～11h, the kiln discharge piling obtains heat exchanger ceramic material for bulk tobacco flue-curing house.
The present invention is take camwood knag, bauxitic clay, Yuanan soil, wollastonite and talcum as main raw material, obtain the intensity height by traditional ball milling mixing, injection forming, plasticity is green compact preferably, obtain the ceramic of various size and shape after the oven dry by rational thermal treatment.This interchanger stupalith, the heat conduction base is aluminum oxide, is provided by aluminum-containing raw material; The anti-thermal shock base is trichroite, and is synthetic at the thermal treatment situ by each raw material, with alpha-alumina crystals mortise on microcosmic, thereby can effectively guarantee high heat conductance and the excellent thermal shock resistance of stupalith.
The invention has the advantages that:
1) prepared heat exchanger ceramic material for bulk tobacco flue-curing house product strength high (anti-folding 220-250Mpa), the high (2.70-2.98g/cm of density
3), thermal conductivity high (in Wuhan University of Technology's investigation of materials and test center's test thermal conductivity being: 3.1-5.52W/m ℃), thermal expansivity is little, thermal shock resistance is good, high temperature creep property is good, maximum operating temperature can reach 1200 ℃, and over-all properties is considerably beyond the metallic recuperator material of present use.
2) the desired raw material overwhelming majority is natural mineral, with low cost, and moulding process is simple, to production unit without particular requirement, firing temperature is consistent with common domestic ceramics, can carry out scale operation at the household porcelain production line, so its comprehensive cost is low, be conducive under current national conditions, carry out wide popularization and application.
The present invention effectively overcomes existing metallic recuperator material erosion resistance, oxidation-resistance is poor, and thermal expansivity is high, and work-ing life is short, the shortcoming that production cost is high.
Embodiment
In order to understand better the present invention, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
A kind of preparation method of heat exchanger ceramic material for bulk tobacco flue-curing house, it comprises the steps:
1) preparation of admixtion: be by the shared mass percent of each raw material in the admixtion: Yuanan soil 15%, bauxitic clay 40%, camwood knag 38%, wollastonite 2%, talcum 5%, choose Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum;
Described Yuanan soil is the soil of Yuanan County, Hubei Province.
Described dispersion agent is hexa metaphosphoric acid.
The raw materials used source of the present invention and main chemical compositions see Table 1:
The chemical constitution of each raw material of table 1 (mass percent content)
| Chemical constitution | SiO 2 | Al 2O 3 | MgO | CaO | Fe 2O 3 | TiO 2 | Loss on ignition | The place of production |
| Yuanan soil | 46.23 | 41.78 | 0.11 | 0.19 | 0.20 | 0.20 | 11.29 | The Yuanan, Hubei |
| Bauxitic clay | 8.69 | 73.00 | 0.23 | - | 1.06 | 2.45 | 14.57 | From Xiaoyi, Shanxi |
| Camwood knag | 45.22 | 34.67 | 0.06 | 0.64 | 1.46 | 1.46 | 16.49 | The Yichang |
| Wollastonite | 50.34 | 0.46 | 1.00 | 44.90 | 0.82 | 0.01 | 2.47 | Daye, hubei Province |
| Talcum | 45.85 | 0.08 | 24.68 | 10.47 | 1.21 | 1.21 | 16.5 | Wide West 3rd Ring Road |
It is thin that Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum are all added water mill through ball mill respectively, crosses 300 mesh sieves after the oven dry, then mixes, and obtains admixtion;
2) preparation of slurry: be by the shared mass percent of each component: admixtion 74.25%, water 25%, dispersion agent 0.75%, choose admixtion, water and dispersion agent; Admixtion is added water and dispersion agent ball milling 5 hours in ball mill, obtain slurry;
3) moulding: ball milling mixes complete, behind old 24 hours of the slurry, slurry after old is injected gypsum mold carry out injection forming (the control slurry obtains the goods of definite shape), treat that the gypsum mold midge is complete, base substrate water ratio in the gypsum mold is lower than the 20% rear demoulding, obtains the base substrate after the demoulding;
4) drying: the base substrate after the demoulding was placed kiln dry 12 hours (90 ℃ of constant temperature are lower dry), the base substrate after obtaining drying;
5) burn till: the base substrate after will drying adopts oxydizing flame to burn till in tunnel furnace, 1300 ℃ of firing temperatures, and firing period 9～11h, the kiln discharge piling obtains heat exchanger ceramic material for bulk tobacco flue-curing house (finishing finished product).
By burning till under the following calcining system:
Obtain intensity high (anti-folding 220-250Mpa), the density 2.86g/cm of heat exchanger ceramic material for bulk tobacco flue-curing house
3, thermal conductivity 4.82W/m ℃, thermal shock resistance reaches the requirement of YB/T376.3 standard, illustrates that thermal shock resistance is good.Maximum operating temperature can reach 1200 ℃.
This embodiment relies on existing production to equip in the industrialization of having carried out each assembly of interchanger in Yidu City, Hubei Province ceramics factory and produces as a trial, find that aborning its processability is good, and sintering is thorough, and the flexural deformation of large size goods is minimum.After this each assembly has carried out installing and has carried out the by a definite date flue-cured tobacco test in two weeks in Lichuan City, Hubei Province tobacco leaf company, evidence interchanger normal operation, and flue-cured tobacco is respond well, has reached the set objective that reduces fuel consumption when keeping higher flue-cured tobacco level.
Embodiment 2:
A kind of preparation method of heat exchanger ceramic material for bulk tobacco flue-curing house, it comprises the steps:
1) preparation of admixtion: be by the shared mass percent of each raw material in the admixtion: Yuanan soil 10%, bauxitic clay 50%, camwood knag 34%, wollastonite 1%, talcum 5%, choose Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum;
It is thin that Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum are all added water mill through ball mill respectively, crosses 300 mesh sieves after the oven dry, then mixes, and obtains admixtion;
Described Yuanan soil is the soil of Yuanan County, Hubei Province;
Described dispersion agent is hexa metaphosphoric acid;
2) preparation of slurry: be by the shared mass percent of each component: admixtion 64.25%, water 35%, dispersion agent 0.75%, choose admixtion, water and dispersion agent; Admixtion is added water and dispersion agent ball milling 3 hours in ball mill, obtain slurry;
3) moulding: ball milling mixes complete, behind old 24 hours of the slurry, slurry after old is injected gypsum mold carry out injection forming (the control slurry obtains the goods of definite shape), treat that the gypsum mold midge is complete, base substrate water ratio in the gypsum mold is lower than the 20% rear demoulding, obtains the base substrate after the demoulding;
4) drying: the base substrate after the demoulding was placed kiln dry 12 hours (80 ℃ of constant temperature are lower dry), the base substrate after obtaining drying;
5) burn till: the base substrate after will drying adopts oxydizing flame to burn till in tunnel furnace, 1150 ℃ of firing temperatures, and firing period 9h, the kiln discharge piling obtains heat exchanger ceramic material for bulk tobacco flue-curing house.
Prepared heat exchanger ceramic material for bulk tobacco flue-curing house product strength high (anti-folding 220-250Mpa), the high (2.98g/cm of density
3), thermal conductivity high (5.52W/m ℃), thermal shock resistance reaches the requirement of YB/T376.3 standard, and maximum operating temperature can reach 1200 ℃, and over-all properties is considerably beyond the metallic recuperator material of present use.
Embodiment 3:
A kind of preparation method of heat exchanger ceramic material for bulk tobacco flue-curing house, it comprises the steps:
1) preparation of admixtion: be by the shared mass percent of each raw material in the admixtion: Yuanan soil 14%, bauxitic clay 33%, camwood knag 42%, wollastonite 3%, talcum 8%, choose Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum;
It is thin that Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum are all added water mill through ball mill respectively, crosses 300 mesh sieves after the oven dry, then mixes, and obtains admixtion;
Described Yuanan soil is the soil of Yuanan County, Hubei Province;
Described dispersion agent is hexa metaphosphoric acid;
2) preparation of slurry: be by the shared mass percent of each component: admixtion 75%, water 24.25%, dispersion agent 0.75%, choose admixtion, water and dispersion agent; Admixtion is added water and dispersion agent ball milling 5 hours in ball mill, obtain slurry;
3) moulding: ball milling mixes complete, behind old 24 hours of the slurry, slurry after old is injected gypsum mold carry out injection forming (the control slurry obtains the goods of definite shape), treat that the gypsum mold midge is complete, base substrate water ratio in the gypsum mold is lower than the 20% rear demoulding, obtains the base substrate after the demoulding;
4) drying: the base substrate after the demoulding was placed kiln dry 12 hours (80 ℃ of constant temperature are lower dry), the base substrate after obtaining drying;
5) burn till: the base substrate after will drying adopts oxydizing flame to burn till in tunnel furnace, 1300 ℃ of firing temperatures, and firing period 11h, the kiln discharge piling obtains heat exchanger ceramic material for bulk tobacco flue-curing house.
Prepared heat exchanger ceramic material for bulk tobacco flue-curing house product strength high (anti-folding 220-250Mpa), the high (2.70g/cm of density
3), thermal conductivity high (3.1W/m ℃), thermal shock resistance reaches the requirement of YB/T376.3 standard, and maximum operating temperature can reach 1200 ℃, and over-all properties is considerably beyond the metallic recuperator material of present use.
Embodiment 4:
A kind of preparation method of heat exchanger ceramic material for bulk tobacco flue-curing house, it comprises the steps:
1) preparation of admixtion: be by the shared mass percent of each raw material in the admixtion: Yuanan soil 23%, bauxitic clay 33%, camwood knag 36%, wollastonite 2%, talcum 6%, choose Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum;
It is thin that Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum are all added water mill through ball mill respectively, crosses 300 mesh sieves after the oven dry, then mixes, and obtains admixtion;
Described Yuanan soil is the soil of Yuanan County, Hubei Province;
Described dispersion agent is hexa metaphosphoric acid;
2) preparation of slurry: be by the shared mass percent of each component: admixtion 69.5%, water 29.25%, dispersion agent 1.25%, choose admixtion, water and dispersion agent; Admixtion is added water and dispersion agent ball milling 4 hours in ball mill, obtain slurry;
3) moulding: ball milling mixes complete, behind old 24 hours of the slurry, slurry after old is injected gypsum mold carry out injection forming (the control slurry obtains the goods of definite shape), treat that the gypsum mold midge is complete, base substrate water ratio in the gypsum mold is lower than the 20% rear demoulding, obtains the base substrate after the demoulding;
4) drying: the base substrate after the demoulding was placed kiln dry 12 hours (100 ℃ of constant temperature are lower dry), the base substrate after obtaining drying;
5) burn till: the base substrate after will drying adopts oxydizing flame to burn till in tunnel furnace, 1200 ℃ of firing temperatures, and firing period 10h, the kiln discharge piling obtains heat exchanger ceramic material for bulk tobacco flue-curing house.
Prepared heat exchanger ceramic material for bulk tobacco flue-curing house product strength high (anti-folding 220-250Mpa), the high (2.70g/cm of density
3), thermal conductivity high (3.1W/m ℃), thermal shock resistance reaches the requirement of YB/T376.3 standard, and maximum operating temperature can reach 1200 ℃, and over-all properties is considerably beyond the metallic recuperator material of present use.
Claims (3)
1. a heat exchanger ceramic material for bulk tobacco flue-curing house is characterized in that it is prepared from by admixtion, water and dispersion agent, and the shared mass percent of each component is: admixtion 64.25～75%, water 24.25～35%, dispersion agent 0.75～1.25%;
Described admixtion comprises Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum, and the shared mass percent of each raw material is in the admixtion: Yuanan soil 10～23%, bauxitic clay 33～50%, camwood knag 34～42%, wollastonite 1～3%, talcum 5～8%;
Described Yuanan soil is the soil of Yuanan County, Hubei Province.
2. a kind of heat exchanger ceramic material for bulk tobacco flue-curing house according to claim 1, it is characterized in that: described dispersion agent is hexa metaphosphoric acid.
3. the preparation method of a kind of heat exchanger ceramic material for bulk tobacco flue-curing house as claimed in claim 1 is characterized in that it comprises the steps:
1) preparation of admixtion: be by the shared mass percent of each raw material in the admixtion: Yuanan soil 10～23%, bauxitic clay 33～50%, camwood knag 34～42%, wollastonite 1～3%, talcum 5～8%, choose Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum;
It is thin that Yuanan soil, bauxitic clay, camwood knag, wollastonite and talcum are all added water mill through ball mill respectively, crosses 300 mesh sieves after the oven dry, then mixes, and obtains admixtion;
2) preparation of slurry: be by the shared mass percent of each component: admixtion 64.25～75%, water 24.25～35%, dispersion agent 0.75～1.25%, choose admixtion, water and dispersion agent; Admixtion is added water and dispersion agent ball milling 3～5 hours in ball mill, obtain slurry;
3) moulding: ball milling mixes complete, and slurry injects gypsum mold with the slurry after old and carries out injection forming after old 24 hours, and the demoulding obtains the base substrate after the demoulding;
4) drying: place kiln in 80～100 ℃ of dryings of constant temperature 12 hours, the base substrate after obtaining drying the base substrate after the demoulding;
5) burn till: the base substrate after will drying adopts oxydizing flame to burn till in tunnel furnace, 1150～1300 ℃ of firing temperatures, and firing period 9～11h, the kiln discharge piling obtains heat exchanger ceramic material for bulk tobacco flue-curing house.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1785909A (en) * | 2005-12-09 | 2006-06-14 | 陈文杨 | High-crystal structure cordierite-mullite kiln furniture, kiln refractory product and roasting process |
| CN201830878U (en) * | 2010-11-02 | 2011-05-18 | 湖北省烟叶公司 | Non-metallic heat exchanger used for tobacco flue-curing in bulk curing barn |
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2011
- 2011-05-27 CN CN 201110139597 patent/CN102276239B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1785909A (en) * | 2005-12-09 | 2006-06-14 | 陈文杨 | High-crystal structure cordierite-mullite kiln furniture, kiln refractory product and roasting process |
| CN201830878U (en) * | 2010-11-02 | 2011-05-18 | 湖北省烟叶公司 | Non-metallic heat exchanger used for tobacco flue-curing in bulk curing barn |
Non-Patent Citations (4)
| Title |
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| 不同材质换热器密集烤房能效实验研究;陈献勇 等;《海峡科学》;20091231(第12期);18-21 * |
| 密集烤烟房用氧化铝_堇青石换热陶瓷材料的制备;袁红涛 等;《佛山陶瓷》;20101231;第20卷(第12期);30-33 * |
| 袁红涛 等.密集烤烟房用氧化铝_堇青石换热陶瓷材料的制备.《佛山陶瓷》.2010,第20卷(第12期),30-33. |
| 陈献勇 等.不同材质换热器密集烤房能效实验研究.《海峡科学》.2009,(第12期),18-21. |
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