CN1081480C - Particle capable of fluidizing other viscous fine particle and fluidization method - Google Patents
Particle capable of fluidizing other viscous fine particle and fluidization method Download PDFInfo
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- CN1081480C CN1081480C CN97111769A CN97111769A CN1081480C CN 1081480 C CN1081480 C CN 1081480C CN 97111769 A CN97111769 A CN 97111769A CN 97111769 A CN97111769 A CN 97111769A CN 1081480 C CN1081480 C CN 1081480C
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Abstract
The present invention relates to particles which can uniformly fluidize viscous fine particles and a fluidization method, which belongs to particle fluidization. The particles are non-fibrous particles whose particle size is from scores of mu m to hundreds of mu m and the density is from scores of kg/m3 to hundreds of kg/m3, and are superfine gel particles of hollow balls or bleaching beads or agglomerates; 5 to 50 wt% of the particles are added in fine particles to be uniformly mixed and then is added to the fluidized bed; after the mixture added in the fluidized bed acts with apparent gas at 0.04 m/s, bi-component particles flowing out from a discharge opening can be uniformly fluidized. The present invention has the advantages of simplicity, easy operation and low cost; channeling can disappear in fluidization; in addition, the particles do not have big agglomerates of which the size exceeds 2mm, and the average size of agglomerates is from scores of mu m to about hundreds of mu m.
Description
The invention belongs to the particle fluidization, particularly make the method for viscous fine particle homogeneous fluidization.
Fine grain gas-solid is processed or catalytic reaction process mutually for stickiness, because the fine grain intergranular active force of stickiness is very strong, easily produce channel caking or poly-group during fluidization, the gas-solid contacting efficiency reduces, make the reactor hot-spot, catalyst activity reduces or completely loses activity, influences the efficient of reactor.
At present, to the fine grain fluidization process of stickiness, generally divide two classes:
(1). the additional external force field
As document Mori, S., second Sino-Japan fluidization proceedings, P.75 (1988) (inFluidization ' 88 for Mori, S., Science and Technology, eds., Kwauk, M., and Kunii, D., p.75 (1988)), with Q.Zhu and H.Li, " magnetofluidization of C class particle ", powder technology, 86 (2), 179-185 (1996) (Q.Zhu and H.Li; " Study on magnetic fluidization of group Cpowders ", Powder Technology, 86 (2); 179-185 (1996)) the additional external force field reported mainly is a vibrated fluidized bed and magnetic field fluidized bed.Use vibrated fluidized bed, most of stickiness fine graineds can be realized the fluidization operation under certain vibration frequency, but because reactor assembly is in vibrational state, on problems such as pipeline connection, equipment life fatal shortcoming are arranged during amplification; Magnetic field fluidized bed system utilizes ferromagnetic particle to form next broken poly-group of chain thing and bubble in magnetic field.Thereby improve the fine grain fluidization quality of stickiness, but amplify difficulty, power consumption is big, unsuitable high-temperature operation.
(2). the intrinsic method
The intrinsic method of utilizing that U.S. Pat 4743431 and Japan Patent JP2106214 are reported promptly utilizes the interpolation particle of heterogeneity and shape and surface modification to improve the fine grain fluidization quality of stickiness.This method simple and convenient, do not need optional equipment, but for fluidization, owing to lack the foundation of choosing of the kind of adding particle, shape, particle diameter, do not have directive significance during the industrialization operation based on stickiness fine grained bed material.
For the particle that the viscous fine particle homogeneous fluidization is added, add fibrous particle as the employing that U.S. Pat 4743431 is reported, to prevent the bonding of viscous material; And Japan Patent JP62106214 be adopt to add the bigger particle of sand isodensity (＞1.0g/cc).But they have respectively to the defective of life, are difficult for processing as particle, can't be applicable to large-scale industrial production and big to equipment attrition, because density contrast is big, the low gas velocity operation is not easy control, difficult common fluidisation.
The objective of the invention is to address the aforementioned drawbacks, a kind of equipment that do not damage is provided, easily makes viscous fine particle homogeneous fluidization industrial production, energy consumption is low, produce and not limited by temperature, density is little and be convenient to process and be applicable to a kind of method that makes the viscous fine particle homogeneous fluidization of suitability for industrialized production.
Realize that the technical scheme that purpose of the present invention adopts is to add one to add particle, i.e. fluidisation gamete in the stickiness fine grained.Very easily channel, caking or poly-group because the stickiness fine grained itself has tangible intergranular adhesive force, according to bed material particle and the difference of adding particle properties, the bed material particle combines selectively with adding particle, makes that fine grained can not autohemagglutination Cheng Daju group; Or add particle shielding intergranular power, stop poly-regimental commander big.Thereby fine grained is able to fluidization stably.
The selected particle of the present invention is a kind of particle that makes the viscous fine particle homogeneous fluidization, it is characterized in that particle be particle diameter be tens μ m to hundreds of μ m, density is tens to hundreds of kg/m
3Non-fibrous particle; Non-fibrous particle is hollow ball or floats pearl or the ultra-fine gel-like particle of poly-group.
The fluidised method of the present invention be at first select to add particle diameter be tens μ m to hundreds of μ m, density be several+to hundreds of kg/m
3Non-fibrous particle, add in the fine grained in the ratio of adding particle and fine grained (percentage by weight) 5-50%, mix, join in the fluid bed then, in fluid bed,, can realize uniform fluidization through the bi-component particle that discharging opening flows out with after the superficial gas effect greater than 0.04m/s; Mixing can be in fluid bed; Non-fibrous particle is hollow ball, floats pearl or gather the ultra-fine gel-like particle of group.
Further introducing concrete technology contents of the present invention below is how to realize goal of the invention.Before material adds fluid bed,, choose the interpolation particle according to the rerum natura of bed material particle.Add particle two kinds of different mechanisms of action arranged:
1.. enter the poly-group of bed material, change its structure.Use to add particle, can reduce the density of poly-group, the little poly-group that formation can fluidisation.If chain or netted poly-group add particle and are used to replace the catemer particle, the blocking-up particle chain.
Select foundation: with the bed material particle be the less fine grained of similar compound density, this kind particle is quiescent fluidization separately; As the bed material particle is netted poly-group, selects diameter near mesh size, the less stickiness particle of density.
2.. do not enter the poly-group of bed material, but stop poly-regimental commander big.A kind of situation is to add the poly-group of particle by the broken bed material of collision; Another kind of situation is to add the particle shielding bed material is intergranular to stick, and stops poly-regimental commander big.
Select foundation: density is less than the bulky grain of bed material or with firm poly-naturally group fine grained that exist, that density is littler.
Method of the present invention is: selecting particle diameter is that tens μ m are tens to hundreds of kg/m to hundreds of μ m, density
3Hollow ball or float pearl, join in the fine grained by adding the quality adding proportion that particle accounts for fine grained 5-50%, before adding fluid bed, generally to mix, also can directly add in the fluid bed, because under the air-flow effect, two kinds of particles will reconfigure.After through a certain higher superficial gas velocity (generally will surpass 0.04m/s) effect, the bi-component particle can be realized uniform fluidization.
The coarse granule that adds can be: particle diameter is that tens μ m are tens to hundreds of kg/m to hundreds of μ m, density
3Hollow ball or float the ultra-fine gel-like particle that the less fine grained of pearl isodensity maybe can form the poly-group with above-mentioned particle diameter and density.
The above-mentioned various particles of carrying all can be bought on market.
The present invention makes the stickiness fine grained realize homogeneous fluidization, has a significant effect:
1. after adding suitable interpolation particle, channel disappears, and hybrid particles all has a stable fluidization pressure drop, and production is not limited by temperature.
2. the bed collapse process (weighing a kind of conventional means of grain fluidized quality) of mixed particle has typical three phase characteristics, and the time in hindered settling stage wherein generally surpasses 2s;
3. all do not have the significantly big poly-group that surpasses 2mm, average poly-group size from tens μ m to hundreds of μ m about.
Embodiment 1
Bed material is calcium carbonate (particle diameter 4.6 μ m, density 2.54g/cm
3) time, selecting particle diameter is that 50 μ m, density are 0.52g/cm
3Hollow ball, join in the calcium carbonate by adding the quality adding proportion that particle accounts for fine grained 50%, mix with agitator, surpassing under the superficial gas velocity effect of 0.04m/s, calcium carbonate granule can be realized uniform fluidization.Whole bed expansion is even, and poly-group is all less than 1mm.
Embodiment 2
Bed material is iron oxide yellow (particle diameter 0.6 μ m, density 3.76g/cm
3) time, select the ultra-fine tenderly white carbon black of gel-like, dp=0.01 μ m, density p b=64.5kg/m
3, the quality adding proportion that accounts for fine grained 5% by the interpolation particle joins in the iron oxide yellow, mixes with agitator, adds fluidisation in the fluid bed then, surpassing under the superficial gas effect of 0.04m/s, and poly-group minimum (the most about 1mm), fluid effect is the best also.Same quadrat method, adding proportion 30%, selecting particle diameter is that 120 μ m, density are 0.82g/cm
3When floating pearl, the big poly-group that bed does not have above 1mm forms, and fluidisation is steady.
Embodiment 3
Bed material is magnetic (particle diameter 0.8 μ m, density 4.72g/cm
3) time, select the ultra-fine tenderly white carbon black of gel-like, dp=0.01 μ m, density p b=64.5kg/m
3, the quality adding proportion that accounts for fine grained 10% by the interpolation particle joins in the iron oxide yellow, mixes with agitator, adds fluidisation in the fluid bed then, is surpassing under the superficial gas effect of 0.04m/s, does not have macroscopic poly-group and forms, and fluidisation is steady.Same quadrat method, adding proportion 25%, particle diameter is that 50 μ m, density are 0.52g/cm
3During hollow ball, also better fluidisation.
Claims (3)
1. method that makes the viscous fine particle homogeneous fluidization is characterized in that at first selecting to add particle diameter and is tens μ m to hundreds of μ m, and density is tens to hundreds of Kg/m
3Spheric granules, in adding particle and fine grained percentage by weight is that the ratio of 5-50% is added in the fine grained, mix, join in the fluid bed then, in fluid bed,, can realize uniform fluidization through the bi-component particle that discharging opening flows out with after the superficial gas effect greater than 0.04m/s.
2. a kind of method that makes the viscous fine particle homogeneous fluidization as claimed in claim 1 is characterized in that described being blended in the fluidized-bed carry out.
3. a kind of method that makes the viscous fine particle homogeneous fluidization as claimed in claim 1 is characterized in that described spheric granules is hollow ball, floats pearl or gather the ultra-fine gel-like particle of group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97111769A CN1081480C (en) | 1997-05-13 | 1997-05-13 | Particle capable of fluidizing other viscous fine particle and fluidization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97111769A CN1081480C (en) | 1997-05-13 | 1997-05-13 | Particle capable of fluidizing other viscous fine particle and fluidization method |
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| Publication Number | Publication Date |
|---|---|
| CN1198961A CN1198961A (en) | 1998-11-18 |
| CN1081480C true CN1081480C (en) | 2002-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN97111769A Expired - Fee Related CN1081480C (en) | 1997-05-13 | 1997-05-13 | Particle capable of fluidizing other viscous fine particle and fluidization method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301785C (en) * | 2004-12-13 | 2007-02-28 | 东南大学 | Fluidized bed dry type aerosal generating method and aerosol generator |
| CN110877974A (en) * | 2018-09-06 | 2020-03-13 | 西安交通大学 | Low-density and high-strength ceramic ball and preparation method thereof |
| CN109046187B (en) * | 2018-10-09 | 2023-05-23 | 天津西敦津洋环保科技有限公司 | High-aeration rate gas-solid fluidized bed reactor, method for realizing high aeration rate in fluidized bed and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62106214A (en) * | 1985-11-05 | 1987-05-16 | Kawasaki Heavy Ind Ltd | Method of preventing scale from adhering on heat transfer pipe in fluidized bed |
| US4738828A (en) * | 1984-12-20 | 1988-04-19 | Trw Inc. | Fluidization aid including low bulk density fluidization aid |
| US4743431A (en) * | 1982-01-15 | 1988-05-10 | Trw Inc. | Fluidization aid including low bulk density fluidization aid |
-
1997
- 1997-05-13 CN CN97111769A patent/CN1081480C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4743431A (en) * | 1982-01-15 | 1988-05-10 | Trw Inc. | Fluidization aid including low bulk density fluidization aid |
| US4738828A (en) * | 1984-12-20 | 1988-04-19 | Trw Inc. | Fluidization aid including low bulk density fluidization aid |
| JPS62106214A (en) * | 1985-11-05 | 1987-05-16 | Kawasaki Heavy Ind Ltd | Method of preventing scale from adhering on heat transfer pipe in fluidized bed |
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| Publication number | Publication date |
|---|---|
| CN1198961A (en) | 1998-11-18 |
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