CN1288129C - Improved method and apparatus for combined drum granulating large granule urea - Google Patents
Improved method and apparatus for combined drum granulating large granule urea Download PDFInfo
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- CN1288129C CN1288129C CN 02116695 CN02116695A CN1288129C CN 1288129 C CN1288129 C CN 1288129C CN 02116695 CN02116695 CN 02116695 CN 02116695 A CN02116695 A CN 02116695A CN 1288129 C CN1288129 C CN 1288129C
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Abstract
The present invention relates to an improved method and an apparatus for a combined granulation revolving drum of large granule urea, which solves the defects of the prior art of high equipment cost and energy source waste. In the method, in a fluidized bed of the combined granulation revolving drum, liquid drops of melting urea are uniformly sprayed on the particle surfaces of urea crystal nucleus so that the urea crystal nucleus particles are enlarged in a boiling state to generate urea particles in different sizes. After sieving, urea particles with qualified granularity are cooled by a combined cooling drum of finished products to obtain finished products after sieving; exhaust gas which is exhausted from the combined granulation revolving drum, and the combined cooling drum of finished products and contains urea is introduced into the lower part of a urea prilling tower through a draught fan to move from bottom to top; after being washed by liquid drops of urea liquid melt, the exhaust gas is exhausted into atmosphere, wherein the liquid drops of urea liquid melt are sprayed from top to bottom in the prilling tower. The apparatus used by the method comprises the combined granulation revolving drum, a conveyor, a large particle vibration sieve, a pulverizer, the combined cooling drum of finished products, wherein the combined granulation revolving drum, and an air outlet of the combined cooling drum of finished products are communicated with the lower part of a urea prilling tower in an ordinary urea process apparatus.
Description
Technical field:
The present invention relates to a kind of combined drum granulating method and apparatus of production method and equipment, particularly urea of urea.
Background technology:
The present invention is to be 99122286.5 to application number, name is called the improvement application of " large size particle urea composite rotary drum prilling process and equipment " application for a patent for invention, 99122286.5 the gas that comes out from combination granulating rotating drum and combination drum cooler in the summary of the invention of number patent application all contains urea, therefore must handle just and can be discharged in the atmosphere containing the urea air, be about to urea-containing air and send into the dust washing tower by induced draft fan, carbamide dust is washed off and reclaimed, then clean air is discharged in the atmosphere.Adopting the dust washing tower that urea-containing air is washed needs to build huge washing tower, not only causes whole plant cost height, complex manufacturing, and the more energy of production process consumption.
Summary of the invention:
The technological deficiency that the present invention solves granular urea production unit cost height in the prior art, wastes energy designs a kind of equipment manufacturing cost and reduces greatly, the granular urea production method and the equipment of save energy.
Technical scheme of the present invention is: a kind of improved combined drum granulating large granule urea method, in the fluidized-bed of combination granulating rotating drum, the fusing urea drop evenly is sprayed at urea nucleus particle surface in the fluidized-bed, under fluidization air effect from the bottom to top, urea nucleus particle constantly increases under boiling state, generate the urea granules of different sizes, after screening, excessive urea granules returns granulation again in the described combination granulating rotating drum together through pulverizing and too small urea granules, and the urea granules that granularity is qualified obtains finished product through finished product combination drum cooler cooling with after rescreening branch; It is characterized in that the urea-containing waste gas of discharging is through bottom that induced draft fan is introduced urea prilling tower in the common urea process unit from described combination granulating rotating drum and described finished product combination drum cooler, and from bottom to top motion in described urea prilling tower, be discharged in the atmosphere after the urea melt drop that in described urea prilling tower, sprays the from top to bottom washing.
Described urea-containing waste gas is sent to the dust washing tower when the washability deficiency of urea prilling tower.
The urea granules that described carbamide granulation tower bottom generates enters the Flashmelt device through screening than small-particle, is fused into molten state urea and is sent to urea pump in the described urea technique device, plays past described carbamide granulation cat head granulation again; The larger particles that sieves out is sent in the combination granulating rotating drum and is used for the qualified urea granules of production granularity as described urea nucleus particle.
The urea-containing waste gas of discharging in described combination granulating rotating drum and the described finished product combination drum cooler is after induced draft fan is drawn, through the bottom that urea prilling tower in the common urea process unit is introduced in the water cooler cooling.
The straying quatity that enters the fusing urea in the fluidized-bed of described combination granulating rotating drum is relevant with the urea granules that urea nucleus particulate parts by weight and described carbamide granulation tower bottom come out, and is generally 2-4: 1.
Temperature is 90-100 ℃ in the described fluidized-bed.
The flow of described fluidization air in fluidized-bed is relevant with the fusing urea that sprays into, and fusing urea per ton needs about 4000 cubic metres of fluidization air.
Described improved combined drum granulating large granule urea method equipment used, comprise the combination granulating rotating drum, transfer roller, macrobead vibratory screening apparatus, pulverizer, the finished product combination drum cooler that are provided with fluidized-bed in it, it is characterized in that the air of described combination granulating rotating drum and finished product combination drum cooler all is communicated with the bottom of urea prilling tower in the common urea process unit.
Described carbamide granulation tower bottom links to each other with a Flashmelt device through a prilling tower vibratory screening apparatus, and described Flashmelt device links to each other with urea pump in the described urea technique device.
The fine particle output terminal of described macrobead vibratory screening apparatus and the pulverized particles output terminal of pulverizer all link to each other with a water cooler, and described water cooler links to each other with the opening for feed of combination granulating rotating drum.
Described combination granulating rotating drum comprises a plurality of folding shape flights that are arranged on the rotary drum inwall, coaxial material discharge port and the air that is arranged on multihole distributor, the fusing urea inlet pipe that is arranged on described rotary drum one side and fluidization air inlet tube that back taper flute profile in the described rotary drum and the discrepant fluidized-bed of bed wall height, described fluidized-bed bottom be provided with near the bottom and feed chute, opposite side, the correspondence position of described fusing urea inlet pipe and fluidized-bed has a plurality of nozzles, and the fluidized-bed length of every 150-500mm is provided with a nozzle; Described fusing urea inlet pipe is arranged in the fluidized-bed.
Described fusing urea inlet pipe is arranged near the lower bed wall outside of fluidized-bed.
The percentage of open area of described multihole distributor is 0.8-7%, and the aperture is 0.8-2.5mm, and the flight on the described rotary drum inwall becomes 0-25 ° of angle with axis; Also be provided with atomisation unit on the described nozzle.
Described transfer roller is bucket elevator or rotary conveyor.
Technique effect: the urea-containing waste gas that the present invention will discharge from combination granulating rotating drum and finished product combination drum cooler is bottom direct or urea prilling tower in supercooler introducing common urea process unit through induced draft fan, and is discharged in the atmosphere after the urea melt drop that sprays from top to bottom in the urea prilling tower washing.Be that the present invention directly utilizes the urea prilling tower in the existing urea process device urea-containing waste gas to be washed rather than makes specially a huge washing tower, simplified the granular urea production technique, the whole plant cost is greatly reduced, saved washing tower, urea production process also just consumes the less energy, reaches the purpose of save energy.Particularly, adopting urea prilling tower to replace water wash column, is example with 50,000 tons of/year granular urea production equipments, adopts the inventive method and equipment can build the stainless steel washing tower and related facility one cover of 4 meters high 8 meters of diameters less, saves the nearly million people people's coin of investment.
If the washability of urea prilling tower is not enough, a small-sized washing tower also can be set, its laid down cost and energy consumption are lower than existing equipment equally.
Prilling tower vibratory screening apparatus and Flashmelt device are set in the bottom of urea prilling tower, make the urea nucleus particle that enters in the combination granulating rotating drum relatively large, can improve the production efficiency of combination granulating rotating drum, less urea granules also obtains recycling through the urea pump that the Flashmelt device enters in the urea technique device.
Description of drawings:
Fig. 1 is technical process of the present invention and structural representation;
Fig. 2 is a granulating rotating drum structural representation of the present invention;
Fig. 3 is that fusing urea inlet pipe of the present invention is arranged on the schematic cross-section near the lower bed wall outside of fluidized-bed.
Fig. 4 is that fusing urea inlet pipe of the present invention is arranged on the schematic cross-section in the fluidized-bed.
Embodiment:
Embodiment 1: the technical process and the equipment that have comprised most preferred embodiment of the present invention among Fig. 1.In the fluidized-bed 22 of combination granulating rotating drum 1, fusing urea is imported by fusing urea inlet pipe 19, evenly be sprayed at the urea nucleus particle surface in the fluidized-bed 22, under fluidization air 11 effects from the bottom to top, urea nucleus particle constantly increases under boiling state, generate the urea granules of different sizes, after screening, excessive urea granules returns granulation again in the described combination granulating rotating drum 1 together through pulverizing and too small urea granules, the urea granules that granularity is qualified obtains finished product through 3 coolings of finished product combination drum cooler with after rescreening branch, the bottom of the urea-containing waste gas of from combination granulating rotating drum 1 and finished product combination drum cooler 3, discharging urea prilling tower 4 in induced draft fan introducing common urea process unit, and from bottom to top motion in described urea prilling tower, be discharged in the atmosphere after the urea melt drop that in described urea prilling tower 4, sprays the from top to bottom washing.The urea granules that urea prilling tower 4 bottoms generate enters Flashmelt device 6 through 5 screenings of prilling tower vibratory screening apparatus than small-particle, is fused into molten state urea and is sent to urea pump 7 in the urea technique device, beats past urea prilling tower 4 and pushes up granulation again; The larger particles that sieves out is sent in the combination granulating rotating drum 1 and is used for the qualified urea granules of production granularity as described urea nucleus particle.The straying quatity that enters the fusing urea in the fluidized-bed 22 of combination granulating rotating drum 1 is relevant with the urea granules that comes out in urea nucleus particulate parts by weight and described urea prilling tower 4 bottoms, be generally 2-4: 1, temperature is 90-100 ℃ in the fluidized-bed 22 in technological process.The flow of fluidization air 11 in fluidized-bed 22 is relevant with the fusing urea that sprays into, and fusing urea per ton needs about 4000 cubic metres of fluidization air.Molten urea solution is sprayed at urea nucleus particle surface after dropping in and atomizing under atomizing air or self the pressure effect.The urea-containing waste gas of discharging in combination granulating rotating drum 1 and the finished product combination drum cooler 3 is after induced draft fan 15 is drawn, through the bottom that urea prilling tower 4 in the common urea process unit is introduced in water cooler 16 coolings.33 is qualified finished urea particle collection device among Fig. 1.
Above-mentioned technological process equipment used comprises combination granulating rotating drum 1, transfer roller 9, macrobead vibratory screening apparatus 12, pulverizer 13, the finished product combination drum cooler 3 that is provided with fluidized-bed 22 in it, and the air of combination granulating rotating drum 1 and finished product combination drum cooler 3 all is communicated with the bottom of urea prilling tower 4 in the common urea process unit.The urea prilling tower outlet at bottom links to each other with a Flashmelt device 6 through a prilling tower vibratory screening apparatus 5, and Flashmelt device 6 links to each other with urea pump 7 in the urea technique device.The fine particle output terminal of macrobead vibratory screening apparatus 12 all links to each other with a water cooler 8 with the pulverized particles output terminal of pulverizer 13, and water cooler 8 links to each other with the opening for feed of combination granulating rotating drum 1.Present embodiment transfer roller 9 is a bucket elevator, and transfer roller 9 also can be rotary conveyor.
Fig. 2 is a granulating rotating drum structural representation of the present invention, combination granulating rotating drum 1 comprises a plurality of folding shape flights 20 that are arranged on rotary drum 23 inwalls, coaxial back taper flute profile and the discrepant fluidized-bed 22 of bed wall height that is arranged in the described rotary drum 23, the multihole distributor 24 that fluidized-bed 22 bottoms are provided with near the bottom, be arranged on fusing urea inlet pipe 19 and the fluidization air inlet tube 18 and the feed chute 2 of rotary drum 23 1 sides, the material discharge port 25 of opposite side and air 26, fusing urea inlet pipe 19 has a plurality of nozzles 21 with the correspondence position of fluidized-bed 22, and the fluidized-bed length of every 150-500mm is provided with a nozzle; Fusing urea inlet pipe 19 is arranged in the fluidized-bed.The percentage of open area of multihole distributor 24 is 0.8-7%, and the aperture is 0.8-2.5mm, and the folding shape flight 20 on rotary drum 23 inwalls becomes 0-25 ° of angle with axis: also be provided with atomisation unit on the nozzle 21.
Can find out among Fig. 3 that fusing urea inlet pipe 19 is arranged near the lower bed wall outside of fluidized-bed 22.
Fig. 4 can find out that fusing urea inlet pipe 19 is arranged in the fluidized-bed.
Embodiment 2: when urea-containing waste gas when the washability of urea prilling tower is not enough, small-sized dust washing tower also can be set, with waste gas emptying after small-sized washing tower washing.
Claims (10)
1. combined drum granulating large granule urea method, in the fluidized-bed of combination granulating rotating drum, the fusing urea drop evenly is sprayed at urea nucleus particle surface in the fluidized-bed, under fluidization air effect from the bottom to top, urea nucleus particle constantly increases under boiling state, generate the urea granules of different sizes, after screening, excessive urea granules returns granulation again in the described combination granulating rotating drum together through pulverizing and too small urea granules, and the urea granules that granularity is qualified obtains finished product through finished product combination drum cooler cooling with after rescreening branch; The bottom of the urea-containing waste gas of from described combination granulating rotating drum and described finished product combination drum cooler, discharging urea prilling tower in induced draft fan introducing common urea process unit, and from bottom to top motion in described urea prilling tower, be discharged in the atmosphere after the urea melt drop washing of in described urea prilling tower, spraying from top to bottom, the urea-containing waste gas that it is characterized in that discharging in described combination granulating rotating drum and the described finished product combination drum cooler is also introduced the bottom of urea prilling tower in the common urea process unit after water cooler cools off after induced draft fan is drawn.
2. a kind of combined drum granulating large granule urea method according to claim 1 is characterized in that described urea-containing waste gas when the washability deficiency of urea prilling tower, is sent to the dust washing tower.
3. a kind of combined drum granulating large granule urea method according to claim 1, it is characterized in that the urea granules process screening that described carbamide granulation tower bottom generates, enter the Flashmelt device than small-particle, be fused into molten state urea and be sent to urea pump in the described urea technique device, beat toward the granulation again of described carbamide granulation cat head; The larger particles that sieves out is sent in the combination granulating rotating drum and is used for the qualified urea granules of production granularity as described urea nucleus particle.
4, a kind of combined drum granulating large granule urea method according to claim 1, it is characterized in that described carbamide granulation tower bottom links to each other with a Flashmelt device through a prilling tower vibratory screening apparatus, described Flashmelt device links to each other with urea pump in the described urea technique device.
5, a kind of combined drum granulating large granule urea method according to claim 1, it is characterized in that the fine particle output terminal of described macrobead vibratory screening apparatus and the pulverized particles output terminal of pulverizer all link to each other with a water cooler, described water cooler links to each other with the opening for feed of combination granulating rotating drum.
6. a kind of combined drum granulating large granule urea method according to claim 1, the straying quatity and the urea nucleus particulate ratio of weight and number that it is characterized in that entering the fusing urea in the fluidized-bed of described combination granulating rotating drum are 2-4: 1.
7. one kind according to the described a kind of combined drum granulating large granule urea method equipment used of one of claim 1-6, it is characterized in that comprising the combination granulating rotating drum, transfer roller, macrobead vibratory screening apparatus, pulverizer, the finished product combination drum cooler that are provided with fluidized-bed in it, the air of described combination granulating rotating drum and finished product combination drum cooler all is communicated with the bottom of urea prilling tower in the common urea process unit, it is characterized in that also being provided with between the bottom of described air and described urea prilling tower water cooler.
8. according to the described equipment of claim 7, it is characterized in that described carbamide granulation tower bottom links to each other with a Flashmelt device through a prilling tower vibratory screening apparatus, described Flashmelt device links to each other with urea pump in the described urea technique device.
9. according to the described equipment of claim 7, it is characterized in that the fine particle output terminal of described macrobead vibratory screening apparatus and the pulverized particles output terminal of pulverizer all link to each other with a water cooler, described water cooler links to each other with the opening for feed of combination granulating rotating drum.
10. according to the described equipment of claim 7, it is characterized in that described combination granulating rotating drum comprises a plurality of folding shape flights that are arranged on the rotary drum inwall, coaxial back taper flute profile and the discrepant fluidized-bed of bed wall height that is arranged in the described rotary drum, the multihole distributor that described fluidized-bed bottom is provided with near the bottom, be arranged on fusing urea inlet pipe and the fluidization air inlet tube and the feed chute of described rotary drum one side, the material discharge port and the air of opposite side, the correspondence position of described fusing urea inlet pipe and fluidized-bed has a plurality of nozzles, and the fluidized-bed length of every 150-500mm is provided with a nozzle; Described fusing urea inlet pipe is arranged in the fluidized-bed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02116695 CN1288129C (en) | 2002-04-16 | 2002-04-16 | Improved method and apparatus for combined drum granulating large granule urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02116695 CN1288129C (en) | 2002-04-16 | 2002-04-16 | Improved method and apparatus for combined drum granulating large granule urea |
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| Publication Number | Publication Date |
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| CN1451651A CN1451651A (en) | 2003-10-29 |
| CN1288129C true CN1288129C (en) | 2006-12-06 |
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| CN 02116695 Expired - Fee Related CN1288129C (en) | 2002-04-16 | 2002-04-16 | Improved method and apparatus for combined drum granulating large granule urea |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2545073C (en) * | 2003-11-10 | 2013-02-19 | Dsm Ip Assets B.V. | Process for the preparation of urea granules |
| CN102964148B (en) * | 2012-12-03 | 2014-07-16 | 李思斌 | Improved large granule urea combined drum granulating method and equipment |
| CN104693135A (en) * | 2013-12-04 | 2015-06-10 | 山东联合化工股份有限公司 | Urea-caking-proofing urine washing tower |
| CN109173926B (en) * | 2018-08-29 | 2020-06-16 | 上海化工研究院有限公司 | Improved method for producing granular compound fertilizer by drum granulation |
| CN109437984B (en) * | 2019-01-03 | 2021-10-01 | 灵谷化工集团有限公司 | Production device for converting large urea particles into medium urea particles and operation process |
| CN112358327A (en) * | 2020-11-26 | 2021-02-12 | 河南晋开化工投资控股集团有限责任公司 | Energy-saving type large-particle urea granulation system and granulation process |
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Assignee: Beijing Dalike Technology Co. Ltd. Assignor: Li Sibin Contract record no.: 2012990000152 Denomination of invention: Improved large granule urea combined drum granulating method and equipment Granted publication date: 20061206 License type: Exclusive License Open date: 20031029 Record date: 20120329 |
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Granted publication date: 20061206 Termination date: 20210416 |