CN1101363C - Method for producing urea granules - Google Patents
Method for producing urea granules Download PDFInfo
- Publication number
- CN1101363C CN1101363C CN98115143A CN98115143A CN1101363C CN 1101363 C CN1101363 C CN 1101363C CN 98115143 A CN98115143 A CN 98115143A CN 98115143 A CN98115143 A CN 98115143A CN 1101363 C CN1101363 C CN 1101363C
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- China
- Prior art keywords
- urea
- particle
- cylinder
- small
- seed material
- Prior art date
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- Expired - Fee Related
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- Fertilizers (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention relates to a method for producing urea granules by using a fluid drum granulator through a small-granule increasing or granulating method. Granules obtained by the method have the advantages of proper size, increased hardness and low cost of the method.
Description
Technical field
The present invention relates to the granulation of molten salt, use the 0 216 653 li disclosed fluidisation cylinder agglomeration techniques of EP that for example belong to the inventor.
Background technology
This known method is used a kind of prilling granulator, and it comprises the cylindrical horizontal cylinder and the fluidized-bed that infeeds atmospheric air that rotate and be provided with in cylinder inside the jet apparatus that has special anti-clogging plug lifter around its axis.
This prilling granulator is accepted the granulation seed material by the round-robin product slate.
Lifter takes seed material the top of cylinder to, from they drop on its refrigerative fluidisation bed surface here.
The bed surface inclination angle of fluidized-bed can make product flow and drop to the cylinder bottom along bed surface.When falling, they spray them with fused salt.Lifter will wrap the material lift of new salt deposit with further crystallization and cooling.Then same circulation is repeated necessary number of times, to reach desired particle size.The round-robin number of times is obtained by an adjustable overflow device by the decision of the residence time in cylinder.
Summary of the invention
This method is mainly continued to use in nitrate, and the particle that the objective of the invention is to adopt Same Way to be used for urea increases and granulation, in order that obtain the suitable particle size of urea and the urea granules of shape, water-content and hardness with minimum possible cost.
According to the present invention, the method for producing urea granules may further comprise the steps:
-will contain the small-particle of the urea of mean sizes between 1～2mm or the seed material of urea particle joins in the rotary drum of fluidisation cylinder granulating equipment;
-fused urea is ejected in the fluidisation cylinder granulating equipment of described rotation with 96～99.9% concentration with 130～138 ℃ temperature;
-the urea of every 1000kg injection infeeds 1000～2000kg air and passes fluidized-bed, and the temperature of described air is 10～40 ℃;
-at cylinder downstream screening particle, and if desired, described particle is sent into recirculation in the cylinder as seed grain, reach suitable size until them.
Further aspect of the present invention and advantage will be described with reference to the drawings hereinafter.
Description of drawings
Fig. 1 and 2 is two accompanying drawings that specify two embodiment of method of the present invention.
Embodiment
In the embodiment corresponding to the Fig. 1 that increases urea granules, granulating equipment comprises that one is rotated and be provided with the horizontal cylindrical cylinder 10 of lifter (not shown) around its axis, is installed in fluidized-bed 12 and nozzle 14 in the cylinder.
Fluidized-bed air-supplied 16 and nozzle infeed fused urea 18.The small-particle 20 that comes from the urea of small-particle tower (not shown) is sent in the cylinder as seed material and use the fused urea-spray in prilling granulator.
This is the individual not disposable process of round-robin.
The small-particle 22 of the increase of coming out from prilling granulator with 90～95 ℃ temperature sieves in scalping 24, and the bulk material is melted and sends back in the urea soln circulating ring 26 again.The small-particle with suitable dimension that has increased uses air cool off in a fluidized-bed or water is cooled off at a static bulk-material cooler at 28 places, they all are technique known.
The air that comes out from prilling granulator is in 30 and is washed before sending atmosphere back to.
In Fig. 2, represent with identical reference number with member identical in Fig. 1 corresponding to the granulation of urea.
Here, the particle that leaves prilling granulator 10 separates by screening section 24.
The particle of commercial grade size is removed and is delivered to forward cooling section 28, and little returns in the working cycle with overdimensioned particle.
The seed grain 40 that obtains by rough grinding machine in this process infeeds in the prilling granulator.Like this, the particle that little particle, seed grain and corase grind are crossed or enter prilling granulator recirculation as seed perhaps passes through the recirculation of urea soln circulating ring.
As pointing out in the explanation of the present invention, the special character of this method is:
The mean sizes of-urea seed grain is: 1～2mm,
The concentration of-fusing urea (output concentration) is: 96～99.9%,
-the temperature that infeeds the air of fluidized-bed is: 10～40 ℃.
Hereinafter will describe corresponding to these two examples that embodiment is more definite, the ability of supposing equipment is 1000mt/ days, and uses the static bulk-material cooler at 28 ℃.
1, raw material and equipment
2, circulate soln and effluent are from the urea soln of washer
Urea from the fusion hopper
Effluent from washer
3, the character of the finished product
| The short grained increase of urea | The particle of urea | |
| Urea liquid-N2 productive rate-temperature and pressure steam power consumption recycle ratio is processed T=20 ℃ of Δ T=3 ℃ of water cooling water | 99.8% 135 ℃ of 6 abs.bars, 14 kg/t, 10 kwh/t do not have 90 kg/t, 6.5 m3/t | 99.8％ 135℃ 6 abs.bars 28 kg/t 22 kwh/t 1 160 kg/t 6.5 m 3/t |
| The short grained increase of urea | The particle of urea | |
| Urea in 45% solution | 11 kg/t | 28 kg/t |
| The short grained increase of urea | The particle of urea | |
| Urea in 100% solution | 21 kg/t | 90 kg/t |
| The short grained increase of urea | The particle of urea |
| 30mg urea/Nm 3Air | 30mg urea/Nm 3Air |
| The short grained increase of urea | The particle of urea | |
| Water-content hardness granulometry (generally) two urea contents that contract | The highest 0.2% short grained hardness contracts above 1kg weight increase coefficient 2～5, and two urea contents are unobvious to be increased | The highest 0.2% 3kg 3mm is the highest by 1 |
Advantage of the present invention is as follows:
The size of-particle and hardness increase;
-the increase of contracting two urea in product can be ignored;
-for the situation that granule increases, do not need recirculation;
-adopt the required output investment ratio of existing equipment lower thereby production cost is also very low.
Claims (5)
1, produce the method for urea granules, comprising:
-will contain the small-particle of the urea of mean sizes between 1～2mm or the seed material of urea particle joins in the rotary drum of fluidisation cylinder granulating equipment;
-fused urea is ejected in the fluidisation cylinder granulating equipment of described rotation with 96～99.9% concentration with 130～138 ℃ temperature;
-the urea of every 1000kg injection infeeds 1000～2000kg air and passes fluidized-bed, and the temperature of described air is 10～40 ℃;
-at cylinder downstream screening particle, and if desired, described particle is sent into recirculation in the cylinder as seed grain, reach suitable size until them.
2,,, be not provided as the circulation of seed material product when seed material is when being made of small-particle according to the process of claim 1 wherein.
3, according to the process of claim 1 wherein that the particulate temperature of coming out from cylinder is between 90～95 ℃.
4, according to the process of claim 1 wherein that seed material is made of small-particle, the hardness of the product that obtains after particle increases increases by 1 kilogram.
5, according to the process of claim 1 wherein that the increase of the biuret in product can be ignored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98115143A CN1101363C (en) | 1998-06-05 | 1998-06-05 | Method for producing urea granules |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98115143A CN1101363C (en) | 1998-06-05 | 1998-06-05 | Method for producing urea granules |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1238320A CN1238320A (en) | 1999-12-15 |
| CN1101363C true CN1101363C (en) | 2003-02-12 |
Family
ID=5224429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98115143A Expired - Fee Related CN1101363C (en) | 1998-06-05 | 1998-06-05 | Method for producing urea granules |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1101363C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2077147A1 (en) * | 2008-01-04 | 2009-07-08 | Urea Casale S.A. | Fluid bed granulation process and apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056298A (en) * | 1990-11-29 | 1991-11-20 | 辽河化肥厂 | A kind of manufacturing process of urine-base boron fertilizer |
-
1998
- 1998-06-05 CN CN98115143A patent/CN1101363C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056298A (en) * | 1990-11-29 | 1991-11-20 | 辽河化肥厂 | A kind of manufacturing process of urine-base boron fertilizer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1238320A (en) | 1999-12-15 |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030212 Termination date: 20140605 |