CN1377877A - Process for producing large particle urea using finished ureea of prilling tower as seed crystal - Google Patents
Process for producing large particle urea using finished ureea of prilling tower as seed crystal Download PDFInfo
- Publication number
- CN1377877A CN1377877A CN 01106990 CN01106990A CN1377877A CN 1377877 A CN1377877 A CN 1377877A CN 01106990 CN01106990 CN 01106990 CN 01106990 A CN01106990 A CN 01106990A CN 1377877 A CN1377877 A CN 1377877A
- Authority
- CN
- China
- Prior art keywords
- urea
- drum
- rotating drum
- prilling tower
- sent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Fertilizers (AREA)
Abstract
The present invention features that the urea crystal seed from prilling tower flows into prilling drum by the potential difference, urea discharged from the prilling drum is fed via the conveyer belt into double-layered vibration sieve for sieving, and urea discharged from the cooling drum is fed via conveyer belt into single layered vibration sieve for sieving. The present invention utilizes finished urea of prilling tower as seed crystal to produce large particle urea and has simple technological process, saving in investment, low production cost and high economic benefit.
Description
The present invention relates to a kind of method of utilizing the prilling tower finished urea as the seed production granular urea.
Present domestic urea production adopts tower sprinkling pelleting technology basically, and urea granules is less, and is of poor quality, and the utilization ratio of nitrogen is low.In recent years, along with the continuous developing in market, the throughput of world's granular urea is progressively ascendant trend, and the seventies, world's granular urea only accounted for 3.6% of urea gross annual output amount, and just bring up to 19.8% the nineties.World's urea yearly capacity was about 5,300 ten thousand tons in 1997, about 4,000 ten thousand tons of output, and wherein granular urea throughput is 9,200,000 tons, about 8,600,000 tons of output has accounted for about 20.5% of world's urea ultimate production.Domestic present urea production is about 2,700 ten thousand tons, 1,000,000 tons of the granular urea gross annual output quantity not sufficients of Hainan Fu Dao and Ningxia two factories, only account for 3.7% of national urea yearly capacity, the ratio that accounts for urea ultimate production about 20% with the present granular urea in the world is compared, and the development and application of macrobead technology is still very promising.Several years ago, the production of granular urea still belongs to blank at home.Though have some middle-size and small-size nitrogen fertilizer plants once to carry out industrial experiment, tangible effect do not played in the improvement and the raising of domestic carbamide granulation technology.The production of present domestic granular urea mainly depends on introduces external patented technology, Fudao Chemical Engineering Co., Ltd, Hainan Prov. invests 891.4 ten thousand dollars, adopt Norway Hydro fluidized bed granulation process to produce granular urea, be installed on and start building in December, 1994, be constructed and put into operation in October, 1996, the product specification particle diameter has two kinds of 2～4mm and 4～8mm, becomes the large-scale fertilizer plant that China's first hand is produced granular urea.What the chemical fertilizer plant in chemical plant, Ningxia adopted is Japanese TEC fluid injected bed granulation process, puts into operation in June, 1997, produces qualified granular urea on September 30th, 1999.Defectives such as according to incompletely statistics, existing more than 30 families of China present large chemical fertilizer enterprise as all adopting external agglomeration technique, will exist investment huge, and technology dependence is strong, product is single.As utilize the prilling tower finished urea as the seed production granular urea, and compare with foreign technology, not only to reduce investment outlay, technology is simple, and reduces the granular urea production cost.
The present invention seeks to provide a kind of method of utilizing the prilling tower finished urea as the seed production granular urea.
The present invention seeks to realize in the following way: the urea crystal seed that prilling tower comes out flows into granulating rotating drum (M-1) by potential difference, after normal the driving, sieve shaker (M-3, M-6) circulation urea also adds granulating rotating drum, urine by the pumping of urea plant urine and the atomizing air that heats through well heater (E-2) are sprayed onto on the solid urine particle through nozzle, and the heat of crystallization of emitting is taken out of by send into the inner fluidization air of granulating rotating drum (M-1) through gas blower (C-1).
The urea that granulating rotating drum (M-1) is discharged is sent into double-deck sieve shaker (M-3) through conveyor and is sieved, urea less than 2mm returns granulating rotating drum (M-1), the urea of 2～4mm enters drum cooler (M-4), in drum cooler (M-4), sent into the suitable for reading of drum cooler device (M-4) by flight, then in water cooler under the effect of gravity, move from top to bottom, and be cooled with the water heat exchange, urea by landing on water cooler overflow suitable for reading whereabouts and the flight is got off then is cooled with the air flowing heat exchange.
The urea that drum cooler (M-4) is discharged is sent into individual layer sieve shaker (M-6) by belt and is sieved, and returns granulating rotating drum (M-1) less than the urea of 2mm, and the urea product of 2～4mm is packed through human metering after being sent to finished urea bunker (F-1).
Adopt the present invention,, compare with foreign technology owing to utilize the prilling tower finished urea as the seed production granular urea, not only technology is simple, reduce investment outlay, and reduced the granular urea production cost, its market price exceeds about 100 yuan/ton than common urea.
The explanation of the present invention being done into-going on foot below with reference to drawings and Examples:
Fig. 1 is a process flow diagram of the present invention
C-1 is a gas blower among the figure, and E-1 is the fluidization air well heater, and E-2 is the atomizing air well heater, and M-1 is a granulating rotating drum, and M-3 is a double-deck screen shale shaker, and M-4 is a drum cooler, and C-2 is an induced draft fan, and M-6 is a single-deck vibrating screen, and F-1 is the urine storehouse.
Embodiment
The urea crystal seed that prilling tower comes out flows into granulating rotating drum (M-1) by potential difference, after normal the driving, sieve shaker (M-3, M-6) circulation urea also adds granulating rotating drum, urine by the pumping of urea plant urine and the atomizing air that heats through well heater (E-2) are sprayed onto on the solid urine particle through nozzle, crystallization is successively grown up particle.The heat of crystallization of emitting is taken out of by send into the inner fluidization air of granulating rotating drum (M-1) through gas blower (C-1), and the residence time of material in granulating rotating drum can be regulated by the rotating speed of change rotary drum and the height of discharging overflow weir.
The urea that granulating rotating drum (M-1) is discharged is sent into double-deck sieve shaker (M-3) through conveyor and is sieved, and returns granulating rotating drum (M-1) less than the urea of 2mm, and the urea comparatively small amt greater than 4mm focuses on after the discharge.The urea of 2～4mm enters drum cooler (M-4), in drum cooler (M-4), sent into the suitable for reading of drum cooler device (M-4) by flight, then in water cooler (M-4) under the effect at gravity, move from top to bottom, and be cooled with the water heat exchange, the urea by landing on water cooler overflow suitable for reading whereabouts and the flight is got off then is cooled with the air flowing heat exchange.
The urea that drum cooler (M-4) is discharged is sent into individual layer sieve shaker (M-6) by belt and is sieved, and returns granulating rotating drum (M-1) less than the urea of 2mm, and the urea product of 2～4mm is packed through human metering after being sent to finished urea bunker (F-1).
Claims (4)
1, a kind of method of utilizing the prilling tower finished urea as the seed production granular urea, it is characterized in that: the urea crystal seed that prilling tower comes out flows into granulating rotating drum (M-1) by potential difference, the urea that granulating rotating drum (M-1) is discharged is sent into double-deck sieve shaker (M-3) through conveyor and is sieved, and the urea that drum cooler (M-4) is discharged is sent into individual layer sieve shaker (M-6) by belt and sieved.
2, a kind of method of utilizing the prilling tower finished urea as the seed production granular urea, it is characterized in that: after normal the driving, sieve shaker (M-3, M-6) circulation urea also adds granulating rotating drum, urine by the pumping of urea plant urine and the atomizing air that heats through well heater (E-2) are sprayed onto on the solid urine particle through nozzle, and the heat of crystallization of emitting is taken out of by send into the inner fluidization air of granulating rotating drum (M-1) through gas blower (C-1).
3, a kind of method of utilizing the prilling tower finished urea as the seed production granular urea, it is characterized in that: the urea that granulating rotating drum (M-1) is discharged is sent into double-deck sieve shaker (M-3) through conveyor and is sieved, urea less than 2mm returns granulating rotating drum (M-1), the urea of 2～4mm enters drum cooler (M-4), in drum cooler (M-4), sent into the suitable for reading of drum cooler device (M-4) by flight, then in water cooler under the effect of gravity, move from top to bottom, and be cooled with the water heat exchange, urea by landing on water cooler overflow suitable for reading whereabouts and the flight is got off then is cooled with the air flowing heat exchange.
4, a kind of method of utilizing the prilling tower finished urea as the seed production granular urea, it is characterized in that: the urea that drum cooler (M-4) is discharged is sent into individual layer sieve shaker (M-6) by belt and is sieved, urea less than 2mm returns granulating rotating drum (M-1), the urea product of 2～4mm is packed through human metering after being sent to finished urea bunker (F-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01106990 CN1377877A (en) | 2001-04-05 | 2001-04-05 | Process for producing large particle urea using finished ureea of prilling tower as seed crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01106990 CN1377877A (en) | 2001-04-05 | 2001-04-05 | Process for producing large particle urea using finished ureea of prilling tower as seed crystal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1377877A true CN1377877A (en) | 2002-11-06 |
Family
ID=4655944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01106990 Pending CN1377877A (en) | 2001-04-05 | 2001-04-05 | Process for producing large particle urea using finished ureea of prilling tower as seed crystal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1377877A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103028343A (en) * | 2012-12-18 | 2013-04-10 | 天津大学 | Production method for pelletoidal calcium chloride dihydrate |
-
2001
- 2001-04-05 CN CN 01106990 patent/CN1377877A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103028343A (en) * | 2012-12-18 | 2013-04-10 | 天津大学 | Production method for pelletoidal calcium chloride dihydrate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4459326B2 (en) | Mixed fertilizer granulation method | |
| CN102083518B (en) | Method and device for processing of granules | |
| CN104815591A (en) | Fluid bed granulation process and apparatus | |
| CN100450979C (en) | Full- fusing wind-cooling crystallization granulation method and device for composite fertilizer | |
| CN100586906C (en) | Production process for high tower roller composite fertilizer | |
| CN101302123A (en) | Large size particle urea composite rotary drum prilling process and equipment | |
| CN207210288U (en) | Compound fertilizer granulating system | |
| CN1377877A (en) | Process for producing large particle urea using finished ureea of prilling tower as seed crystal | |
| CN101696141A (en) | Method for producing fluidized bed | |
| CN1355152A (en) | Granulating method of urea | |
| CN2370006Y (en) | Drum pelletizing device for urea | |
| CN2683240Y (en) | Spray column-fluidized bed pelletizer | |
| CN112624153B (en) | Porous ammonium nitrate production process | |
| CN214344472U (en) | Energy-saving large granule urea granulation system | |
| CN1100023C (en) | Large size particle urea composite rotary drum prilling technology and equipment | |
| CN1288129C (en) | Improved method and apparatus for combined drum granulating large granule urea | |
| CN220824781U (en) | Fertilizer production equipment | |
| CN201883044U (en) | Tower type cooling, crystallizing and prilling device | |
| CN212791824U (en) | Organic inorganic fertile granulation screening integrated device | |
| CN101376614A (en) | Industrial production method and apparatus of sulfur coated controlled release fertilizer | |
| CN101091892A (en) | Horizontal continuous granulating apparatus of using gravity method | |
| CN200974819Y (en) | Air-cooled crystallization granulating device for full-fusion composite fertilizer | |
| CN113072409A (en) | Low tower preparation method of small particle calcium fertilizer containing nitrogen and calcium oxide | |
| CN206940758U (en) | A kind of high tower compound fertilizer production system | |
| CN118079784A (en) | Combined production method of urea products with multiple granularities |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |