CN105174978A - Preparation technology of heat storage balls - Google Patents
Preparation technology of heat storage balls Download PDFInfo
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- CN105174978A CN105174978A CN201510516323.0A CN201510516323A CN105174978A CN 105174978 A CN105174978 A CN 105174978A CN 201510516323 A CN201510516323 A CN 201510516323A CN 105174978 A CN105174978 A CN 105174978A
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Abstract
The invention relates to a preparation technology of heat storage balls. The preparation technology comprises the following steps: (1) grinding fly ash, aluminum ash, and coal gangue into powder with a particle size less than 80 [mu]m, (2) weighing 65 to 67 parts by weight of fly ash powder, 32 to 35 parts by weight of aluminum ash powder, and 3 to 6 parts by weight of coal gangue powder, evenly mixing the powder, spraying water accounting for 5 to 8% of the total weight of the mixture into the mixture under stirring, and stirring to produce nuclei; (3) subjecting the nucleus-containing mixture obtained in the step (2) to steps of balling, roll-screening, material distributing, and sintering. According to the preparation technology, the waste solids are taken as the raw materials, the physical properties, chemical components, and mineral composition of raw materials are analyzed and scientifically compounded, a dynamic sintering ceramic particle production technology is adopted, a large amount of solid wastes is mixed, the wastes are converted into valuable resources, and environment-friendly heat storage balls that can be used in various furnaces are produced.
Description
Technical field
The invention belongs to environmental protection and energy saving field, relate to a kind of method that solid waste is recycled, be specifically related to a kind of technique preparing heat-storing sphere.
Background technology
Heat-accumulation combustion started to rise in the nineties in 20th century, and it allows fuel burn in high-temperature low-oxygen concentration gas oxygen, was utilized by Mist heat recovering with efficient burning and reduced NO
xthe science and technology such as quantity discharged combine, thus reach the object of energy-saving and emission-reduction.Due to multiple advantages such as its collection energy-saving and environmental protection, Regenerative Combustion Technology is that various countries improve fuel availability further, reduction environmental pollution brings new machine.
The key part of Regenerative Combustion Technology is heat storage, the more heat storage of industrial application has heat-storing sphere and cellular heat storage, its principle of work is that air-flow is divided into very rill stock by numerous bead by certain size grading requirement, when high temperature gas flow flows through in heat storage, form stream of strongly wadding a quilt with cotton, effectively break through the boundary layer of surface of heat accumulator, and by heat conduction to heat storage, sphere diameter is little, conduction radius is little, thermal resistance is little, density high-conductivity is good, because heat storage is under the large temperature difference (150-1000 DEG C), the commutation of frequency fast (20-30 time/h), then there is certain performance requriements to heat storage: 1, the heat storage capacity of unit volume heat storage wants large, 2, heat storage must meet for a long time in the requirement of hot environment work, 3, higher thermal shock resistance, 4. good thermal conductivity, 5, the density of object and the product value of specific heat are the bigger the better, 5, slag resistance is good, 6, structural strength is high.
Trichroite, sillimanite, zircon, kaolin, andaluzite etc. are mainly adopted to be main raw in prior art, add appropriate additive, according to certain proportioning raw materials and granulometric composition, adopt hot-forming ceramic heat storage body and the ceramic honey comb of producing diameter 10-20mm.But the material major part earth reserves selected by this kind of heat storage are less, and some material need manually manufacture (as trichroite, mullite), and thus produced valuable product, is difficult to spread.
The utilization ratio that solid waste discharged by China's industrial and mineral is very low, and it is stacked and landfill not only occupies a large amount of valuable land resources, also can produce huge pollution to environment, be unfavorable for the Sustainable development of society equally.In order to find a kind of excellent utilization of waste material approach to be the problem that field of Environment Protection needs solution badly.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method preparing heat-storing sphere, adopt solid waste to be raw material completely, substitute the Nonrenewable resources that social production heat storage adopts,
For achieving the above object, the invention provides following technical scheme:
Prepare a technique for heat-storing sphere, comprise the following steps:
1) flyash, aluminium ash, colliery powder are broken into the powder that particle diameter is less than 80um;
2) in mass parts, fine coal ashes 65 parts, aluminium ashes 32 parts, coal gangue 3 parts is got, described powder stirring is even, add the water of batch mixing gross weight 5-8% under agitation condition and in the mode of water mist spray and stir nucleation;
3) by step 2) the further balling-up of nucleation batch mixing prepared, roll screen, cloth, sintering.
Preferably, step 3) middle balling-up operation is for adopting pan-pelletizer rolling balling, and spherical diameter is any one in 3mm, 6mm, 8mm, 10mm, 13mm, 16mm, 20mm, 25mm.
Preferably, by measuring the loss on ignition of mixed powder to determine the homogeneity of mixed powder.
Preferably, step 3) increase drying process between middle cloth and sintering, dry 6 ~ 9min at 180 ~ 200 DEG C of temperature.
Preferably, step 3) described in sintering temperature be 1380 ~ 1430 DEG C.
Roll screen is used to reach following object: a, guarantee wet feed spherolite footpath and grating by specified requirement, sizes of balls and wet mash are rejected and reclaimed in roller screen; B, the surface smoothness improving wet feed ball and intensity; C, hollow rate when guaranteeing cloth.
Heat-storing sphere sintering curve is divided into drying zone, heating zone, seed region, internal combustion burn district, region, five, cooling area, necessary adjustment is carried out according to the physical and chemical performance of selected main raw and auxiliary material, drying zone is set mainly in order to reduce the water ratio of wet feed ball, reduce the ball explosion phenomenon caused because heating up rapidly, and then quality is burnt till in raising.Main component due to environmental protection heat-storing sphere is the resistant to elevated temperatures beta-Sialon multiple phase refractory material that aluminum oxide, silicon oxide and magnesium oxide are formed, therefore sintering curve ignition temperature of the present invention brings up to about 1100 DEG C, and burn area temperature is 1380-1430 DEG C.Due in aluminium ash containing the calx of 6-10%, a part is as multiple phase refractory material, and another part to improve the specific surface area of environmental protection heat-storing sphere at roasting process due to aluminium powder as foamed glue, strengthen energy storage effect.
Preferably, adopt nitrogen as protection gas in sintering process.
Described flyash contains: SiO
2: 35 ~ 40%, Al
2o
3: 39-50%, Fe
2o
3: 2 ~ 4%, TiO
2: 0 ~ 1%, MgO:2 ~ 3%, CaO:0.8%, Na
2o:0 ~ 1%, K
2o:0 ~ 1%, SO
3: 0 ~ 1%.
Al in flyash
2o
3content is 39-50%, SiO
2content is 35-40%, and alkaline metal cpds < 3%, and containing a certain amount of MgO and TiO
2, contained component to raising thermal stability and heat-resistant knocking stability all beneficial, this ash is low-sulfur, low calcium in addition, meets the starting material as heat-storing sphere.
Described aluminium ash contains: Al:6 ~ 10%, Al
2o
3: 50 ~ 60%, SiO
2: 3 ~ 5%, Na
2o1 ~ 1.5%, MgO:2 ~ 3%, CaO:1.5 ~ 3%, FeO+MnO:0 ~ 1%.The present invention makes full use of metallic aluminium in aluminium ash as reductive agent, can by flyash, SiO
2reduction, nitrogenize is converted into high temperature resistant thing phase Sialon (β-Sialon), utilizes the active performance of metallic aluminium simultaneously, in high temperature sintering, increases the specific surface area of environmental protection heat-storing sphere, the Al in addition in aluminium ash and flyash
2o
3, MgO as main component, the refractoriness of environmental protection heat-storing sphere and high thermal shock resistance can be improved.Containing the calx of 6 ~ 10% in aluminium ash, a part is as multiple phase refractory material, and another part to improve the specific surface area of environmental protection heat-storing sphere at roasting process due to aluminium powder as foamed glue, strengthen energy storage effect.
Described coal gangue contains: SiO
2: 52 ~ 55%, Al
2o
3: 16 ~ 25%, Fe
2o
3: 2.28 ~ 5.86%, TiO
2: 0.9-4%, MgO:0.44-2.4%, V
2o
5: 0.008-0.3%, Na
2o+K
2o:1.45-3.9%, burning vector: 20 ~ 30%.
The burning vector of coal gangue can be used as environmental protection heat-storing sphere in sintering process in combustible material, and its argillaceous chemical composition participates in the chemical constitution of heat-storing sphere.
Beneficial effect of the present invention is: (1) the present invention utilizes solid waste for raw material, by the physicals to various raw material, chemical composition, mineral composition analysis, science is prepared, select dynamic sinter ceramsite production process, realize the large dosage of solid waste, turn waste into wealth, make the environmental protection heat-storing sphere meeting various roasting kiln needs, meet the policy of national development green economy, recycling economy, low-carbon economy.(2) its refractoriness of environmental protection heat-storing sphere developed according to present method reaches 1750 DEG C, ultimate compression strength (diameter 10mm) 5020N, heat-resistant knocking stability (1100 DEG C of water-cooleds) > 60 times, Mohs' hardness > 7, specific surface area 240m
2/ m
3, thermal conductivity 1.1w/m
2.k, specific heat 1200j/kg0 DEG C.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is heat-storing sphere production technological process;
Fig. 2 is that heat-storing sphere drying and knot burn thetagram.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Prepare heat-storing sphere as follows:
(1) raw material
A, flyash, according to " flyash GB GB/T1596-2005 in cement and concrete " and " radioactive material radionuclides limitation GB GB/6566-2001 " standard-required, select F class flyash, and by chemical composition analysis, suggestion requires high alumina, low-sulfur, low calcium ash.In the present embodiment, flyash picks up from Inner Mongol Datang Tuoketuo Power Plant, chemically examines it, and described flyash contains: SiO
2: 35 ~ 40%, Al
2o
3: 39-50%, Fe
2o
3: 2 ~ 4%, TiO
2: 0 ~ 1%, MgO:2 ~ 3%, CaO:0.8%, Na
2o:0 ~ 1%, K
2o:0 ~ 1%, SO
3: 0 ~ 1%, burn vector: 0.8%.
B, aluminium ash, in the present embodiment, aluminium ash picks up from Baotou Aluminium Plant electrolytic aluminum ash, chemically examines it, and described aluminium ash is containing Al6 ~ 10%, Al
2o
3: 50 ~ 60%, SiO
2: 3 ~ 5%, Na
2o1 ~ 1.5%, MgO:2 ~ 3%, CaO:1.5 ~ 3%, FeO+MnO:0 ~ 1%.
C, coal gangue, in the present embodiment, coal gangue picks up from Erdos area, and described coal gangue contains SiO
2: 52 ~ 55%, Al
2o
3: 16 ~ 25%, Fe
2o
3: 2.28 ~ 5.86%, TiO
2: 0.9-4%, MgO:0.44-2.4%, V
2o
5: 0.008-0.3%, Na
2o+K
2o:1.45-3.9%, burning vector: 20 ~ 30%.
(2) preparation technology
Preparation flow figure by shown in Fig. 1:
1) by flyash, aluminium ash, coal gangue is broken into powder, and cross 200 mesh sieves and get lower part of screen and divide;
2) fine coal ashes 65 parts is got, aluminium ashes 32 parts, colliery powder 3 parts, by even for described powder stirring, employing dry powder stirs, plurality of raw materials is used to stir in dry composition, become a kind of material, by measuring the loss on ignition of mixed powder to ensure that proportioning is even, continue again stir and add batch mixing gross weight 5-8% in the mode of water mist spray, the dry powder mixed under the control of the computer with water smoke (molecularity, certain hydraulic pressure, flow and vaporific nozzle) all mixed stir and form uniform wet feed in the process advanced continuously enter nucleation district, under the stirring of the nucleation blade of (nucleation blade angle 8-10 °), wet feed under the effect of water molecules tension force and material stirring, collision, extruding, under centrifugal physical action such as grade, part wet feed is bonding under the effect of water tension force, form the nucleon (generally about 10%) of certain size, and discharge under stirring (agitating vane angle 18-25 °) effect, be pressed on rotary conveyor continuously,
3) by step 2) to adopt pan-pelletizer to roll into diameter be further 3mm, 6mm, 8mm, 10mm, 13mm, 16mm, 20mm, 25mm spheroid for the nucleation batch mixing prepared;
4) roll screen, for guaranteeing haydite particle diameter and grating, meet sintering quality and burn till product performance, adopt oscillating distributing machine and roller type sieving machine by incongruent pellet (large pellet, small nodules) and wet mash, peeled off away by roller type sieving machine, and reclaim, will wet feed ball continuous rolling on roller bearing of particle diameter, grating be met, improve pellet surface smoothness and intensity;
5) cloth, adopts depression bar to control and electronic measurement, ensures that dolly table top cloth is even, consistency of thickness.The flue gas waste heat recovery simultaneously utilizing sintering process to produce is as the drying temperature of wet feed ball;
6) dry and sintering, fills nitrogen as protection gas, the drying temperature 180-200 DEG C of this example, time 3-9min in sintering process; Ignition temperature 1100 DEG C, regional environment temperature 1000-1200 DEG C, time 2min; Calcination temperature 1380-1430 DEG C, time about 6min; The cooling down time is about 20min, and go out car after below slow continuous cooling to 150 DEG C, temperature curve as shown in Figure 2.
For evaluating the performance of heat-storing sphere, the heat-storing sphere after burning till is carried out to the detection of indices, fire performance detected result is as shown in table 1 below:
Table 1 heat-storing sphere fire performance
| Refractoriness (DEG C) | ≥1700 |
| Volume density (g/cm 3) | 0～2.1 |
| Specific surface area (m 2/m 3) | 200 |
| Thermal expansivity (20-800 DEG C) | ≤5 |
| Specific heat (200-1000 DEG C) (j/kg. DEG C) | 1100-1300 |
| Thermal conductivity (200-1000 DEG C) (w/m 2.k) | 1.5-2.5 |
| Thermal shock strength DEG C/min | ≥450 |
| Heat-resistant knocking stability (1100 DEG C of water-cooleds) | >=30 times |
| Wear rate | ≤0.1％ |
| Ultimate compression strength (N) | ≥4000 |
| Mohs intensity (scal) | ≥6.5 |
Table 1 represents the heat-storing sphere fire performance coefficient prepared by the present embodiment, can find out that the present embodiment utilizes solid waste for raw material from the data of table 1, by the physicals to various raw material, chemical composition, mineral composition analysis, science is prepared, make heat-storing sphere, the fire performance of heat-storing sphere meets property indices requirement.
Again by carrying out chemical composition analysis to heat-storing sphere, analytical results is as table 2:
Table 2 heat-storing sphere chemical composition
| Al 2O 3 | 65-85％ |
| SiO 2 | 10～13％ |
| MgO | 2-3％ |
| Other | 1～2％ |
Heat-storing sphere chemical composition, also can verify that it possesses the component requirements of heat-storing sphere theoretically.
In sum, the present invention mainly according in domestic and international Regenerative Combustion Technology use and researching and developing the technical feature of heat storage of test and various body of heater to the requirement of heat storage, utilize solid waste for raw material, fuel, additive, by physico-chemical analysis, scientific matching, adopt dynamic sinter ceramsite production process, produce the environmental protection heat-storing sphere meeting performance, meet energy storage and waste heat recovery, substitute now conventional Nonrenewable resources, realize green economy, recycling economy and low-carbon economy.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (10)
1. prepare a technique for heat-storing sphere, it is characterized in that, comprise the following steps:
1) flyash, aluminium ash, colliery powder are broken into the powder that particle diameter is less than 80um;
2) in mass parts, fine coal ashes 65 ~ 67 parts, aluminium ashes 32 ~ 35 parts, colliery powder 3 ~ 6 parts is got, described powder stirring is even, add the water of batch mixing gross weight 5 ~ 8% in the mode of water mist spray under agitation condition and stir nucleation;
3) by step 2) the further balling-up of nucleation batch mixing prepared, roll screen, cloth, sintering.
2. prepare the technique of heat-storing sphere according to claim 1, it is characterized in that, step 2) get fine coal ashes 65 parts, aluminium ashes 32 parts, colliery powder 3 parts.
3. prepare the technique of heat-storing sphere according to claim 1, it is characterized in that, sampling is carried out to mixed powder and measures loss on ignition to determine the homogeneity of mixed powder.
4. prepare the technique of heat-storing sphere according to claim 1, it is characterized in that, step 3) middle balling-up operation is for adopting pan-pelletizer rolling balling, and spherical diameter is any one in 3mm, 6mm, 8mm, 10mm, 13mm, 16mm, 20mm, 25mm.
5. prepare the technique of heat-storing sphere according to claim 1, it is characterized in that, step 3) increase drying process between middle cloth and sintering, dry 6 ~ 9min at 180 ~ 200 DEG C of temperature.
6. prepare the technique of heat-storing sphere according to claim 1, it is characterized in that, step 3) described in sintering temperature be 1380 ~ 1430 DEG C.
7. state the technique preparing heat-storing sphere according to claim 6, it is characterized in that, in sintering process, adopt nitrogen as protection gas.
8. prepare the technique of heat-storing sphere according to claim 1, it is characterized in that, described flyash contains: SiO
2: 35 ~ 40%, Al
2o
3: 39-50%, Fe
2o
3: 2 ~ 4%, TiO
2: 0 ~ 1%, MgO:2 ~ 3%, CaO:0.8%, Na
2o:0 ~ 1%, K
2o:0 ~ 1%, SO
3: 0 ~ 1%, burn vector: 0.8%.
9. prepare the technique of heat-storing sphere according to claim 1, it is characterized in that, described aluminium ash contains: Al:6 ~ 10%, Al
2o
3: 50 ~ 60%, SiO
2: 3 ~ 5%, Na
2o1 ~ 1.5%, MgO:2 ~ 3%, CaO:1.5 ~ 3%, FeO+MnO:0 ~ 1%.
10. prepare the technique of heat-storing sphere according to claim 1, it is characterized in that, described coal gangue contains: SiO
2: 52 ~ 55%, Al
2o
3: 16 ~ 25%, Fe
2o
3: 2.28 ~ 5.86%, TiO
2: 0.9-4%, MgO:0.44-2.4%, V
2o
5: 0.008-0.3%, Na
2o+K
2o:1.45-3.9%, burning vector: 20 ~ 30%.
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| CN105174978B CN105174978B (en) | 2018-06-29 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108624294A (en) * | 2018-06-08 | 2018-10-09 | 华北电力大学 | A kind of high temperature phase-change heat-storage material and preparation method based on gangue |
| CN111960851A (en) * | 2020-08-31 | 2020-11-20 | 郑州经纬科技实业有限公司 | Method for preparing cordierite ceramic filter plate based on aluminum ash raw material |
| CN113512408A (en) * | 2021-07-05 | 2021-10-19 | 华北电力大学 | Composite heat storage material based on steel slag-coal gangue and preparation method thereof |
| CN113880604A (en) * | 2021-11-22 | 2022-01-04 | 河南东大高温节能材料有限公司 | Preparation method for preparing ceramic heat storage material by adopting coal gangue |
| CN114477991A (en) * | 2022-02-21 | 2022-05-13 | 河南瓦勒希新材料有限公司 | Method for preparing heat accumulator by utilizing solid waste aluminum ash |
| CN115432997A (en) * | 2022-10-18 | 2022-12-06 | 中南大学 | Ceramic-based molten salt composite phase-change heat storage material and preparation method thereof |
| CN115537556A (en) * | 2022-10-18 | 2022-12-30 | 中南大学 | Porous ceramic heat storage ball and method for preparing porous ceramic heat storage ball based on secondary aluminum ash |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108624294A (en) * | 2018-06-08 | 2018-10-09 | 华北电力大学 | A kind of high temperature phase-change heat-storage material and preparation method based on gangue |
| CN111960851A (en) * | 2020-08-31 | 2020-11-20 | 郑州经纬科技实业有限公司 | Method for preparing cordierite ceramic filter plate based on aluminum ash raw material |
| CN113512408A (en) * | 2021-07-05 | 2021-10-19 | 华北电力大学 | Composite heat storage material based on steel slag-coal gangue and preparation method thereof |
| CN113880604A (en) * | 2021-11-22 | 2022-01-04 | 河南东大高温节能材料有限公司 | Preparation method for preparing ceramic heat storage material by adopting coal gangue |
| CN113880604B (en) * | 2021-11-22 | 2022-12-30 | 河南东大高温节能材料有限公司 | Preparation method for preparing ceramic heat storage material by adopting coal gangue |
| CN114477991A (en) * | 2022-02-21 | 2022-05-13 | 河南瓦勒希新材料有限公司 | Method for preparing heat accumulator by utilizing solid waste aluminum ash |
| CN115432997A (en) * | 2022-10-18 | 2022-12-06 | 中南大学 | Ceramic-based molten salt composite phase-change heat storage material and preparation method thereof |
| CN115537556A (en) * | 2022-10-18 | 2022-12-30 | 中南大学 | Porous ceramic heat storage ball and method for preparing porous ceramic heat storage ball based on secondary aluminum ash |
| CN115432997B (en) * | 2022-10-18 | 2023-08-22 | 中南大学 | Ceramic-based fused salt composite phase-change heat storage material and preparation method thereof |
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| CN105174978B (en) | 2018-06-29 |
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Effective date of registration: 20210527 Address after: 100096 Room 403, 4th floor, building 9, Xisanqi East, Haidian District, Beijing Patentee after: Beijing zhengtangyuxiu Environmental Technology Co.,Ltd. Address before: 014030 2210, 22 / F, building a, Financial Plaza, rare earth high tech Zone, Baotou City, Inner Mongolia Autonomous Region Patentee before: INNER MONGOLIA ZHENGTANG ENVIRONMENTAL PROTECTION INDUSTRY Co.,Ltd. |
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Effective date of registration: 20220707 Address after: 014030 No. 9, building 11, block 16, Xingfu Road, Qingshan District, Baotou City, Inner Mongolia Autonomous Region Patentee after: Fan Yuming Address before: 100096 Room 403, 4th floor, building 9, Xisanqi East, Haidian District, Beijing Patentee before: Beijing zhengtangyuxiu Environmental Technology Co.,Ltd. |