CN100497266C - New process of carbamide granulation cooling - Google Patents
New process of carbamide granulation cooling Download PDFInfo
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- CN100497266C CN100497266C CNB2006100889073A CN200610088907A CN100497266C CN 100497266 C CN100497266 C CN 100497266C CN B2006100889073 A CNB2006100889073 A CN B2006100889073A CN 200610088907 A CN200610088907 A CN 200610088907A CN 100497266 C CN100497266 C CN 100497266C
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Abstract
The invention discloses a novel technology for urea granulating and cooling, which employs nozzles to add water with a pressure of 0.6-1.6MPa and a temperature which is 220-320 DEG C in the granulating process, and the quantity of the added water is 10kg/ton urea. The cooling method of the invention can reduce the cooling air consumption by above 10%, end gas discharging above 10%, and energy consumption above 20%, thus reaching the goal of environment protection and energy conservation; furthermore, the spraying water of the invention is steam, which does not affect the granulating of urea during the cooling process and effectively ensure the quality of urea product.
Description
Technical field
The present invention relates to a kind of new process of carbamide granulation cooling.
Background technology
At present, known carbamide granulation processing method mainly contains: the granulation of fluidized bed prilling device, rotary drum granulator granulation, the granulation of sprinkling pelleting tower.
As shown in Figure 1, be fluidized bed prilling device production technique, its key step is: urea soln enters Fitz chilsonator through pipeline, and cooling air enters Fitz chilsonator through pipeline and forms fluidized-bed 1, product urea flows into subsequent processing by fluidized-bed 1, and tail gas generated by granulation is discharged emptying after treatment by the Fitz chilsonator top.
As shown in Figure 2; be the rotary drum granulator production technique; its key step is: urea soln enters rotary drum granulator 2 one ends through pipeline; cooling air enters rotary drum granulator 2 through pipeline; product urea flows into subsequent processing by rotary drum granulator 2 the other ends, and tail gas generated by granulation is discharged emptying after treatment by rotary drum granulator 2.
As shown in Figure 3, be sprinkling pelleting tower production technique, its key step is: urea soln is sprayed downwards by prilling tower 3 tops through pipeline, and cooling air enters prilling tower 3 by the bottom, product urea is collected by prilling tower 3 bottoms and is sent into subsequent processing, and tail gas generated by granulation is discharged emptying by prilling tower 3 tops.
Existing above-mentioned three kinds of carbamide granulation technologies in process of production, the carbamide granulation process all is with about 95%～99.7%, urea soln that temperature is about 135 ℃ or fused solution are by the cooling air mode crystalline forming, and the carbamide granulation type of cooling all is to utilize air as thermal barrier, takes away the heat of crystallization and the urea soln moisture evaporated of urea.Because urea crystals is an exothermic process, therefore need a large amount of air to remove heat of crystallization and sensible heat, this will make fluidized-bed or rotary drum granulator, or the sprinkling pelleting tower must consume a large amount of air in granulation refrigerative process, simultaneously consume a large amount of energy, cooling performance is also not good yet; Must be before cooled exhaust emissions through repeatedly dedusting washing, this step need consume a large amount of energy equally, but also has brought serious dust problem, causes the pollution of environment; Because in the process of cooling, the bad control of air consumption, cooling performance are not good, contain factor such as impurity in the air, also can have influence on the quality of product again.
Energy problem is present stage one of the significant problem that faced of industrial production, and therefore, the carbamide granulation process for cooling of environmental protection is the key content that those skilled in the art study again when can guarantee carbamide granulation quality, save energy.
Summary of the invention
The object of the present invention is to provide a kind of conditional request that can satisfy the urea crystals granulation, can reduce cooling air consumption and then save energy again when guaranteeing the granulation quality, reduce the new process of carbamide granulation cooling that the exhaust emissions amount helps environment protection.
To achieve these goals, the present invention adopts following technical scheme:
A kind of new process of carbamide granulation cooling, it comprises the steps: at the fluidized bed prilling device
A, with 95%～99.7%, the urea soln of 135 ℃ of temperature enters the fluidized bed prilling device through pipeline, cooling air enters Fitz chilsonator through pipeline and forms fluidized-bed;
When B, urea soln entered fluidized-bed grain device, utilizing shower nozzle to add pressure in fluidized-bed was that 0.6～1.6MPa, temperature are 220～320 ℃ water, and the water yield of adding is a 10kg/ ton urea;
Flow into bucket elevator by fluidized-bed after C, product urea are cooled to 90 ℃ and deliver to the screening operation, tail gas generated by granulation is discharged emptying after treatment by the Fitz chilsonator top.
A kind of new process of carbamide granulation cooling, it comprises the steps: at rotary drum granulator
A, with 95%～99.7%, the urea soln of 135 ℃ of temperature enters rotary drum granulator one end through pipeline, cooling air enters tablets press through pipeline;
B, urea soln are when entering rotary drum granulator, and utilizing shower nozzle to add pressure in tablets press is that 0.6～1.6MPa, temperature are 220～320 ℃ water, and the water yield of adding is a 10kg/ ton urea;
Flow into bucket elevator by the tablets press the other end after C, product urea are cooled to 90 ℃ and deliver to the screening operation, tail gas generated by granulation is discharged emptying after treatment by tablets press.
A kind of new process of carbamide granulation cooling, it comprises the steps: at the sprinkling pelleting tower
A, with 95%～99.7%, the urea soln of 135 ℃ of temperature sprays downwards by sprinkling pelleting tower top through pipeline, cooling air enters prilling tower by the bottom;
B, urea are when entering the sprinkling pelleting tower, and utilizing shower nozzle to add pressure on prilling tower top is that 0.6～1.6MPa, temperature are 220～320 ℃ water, and the water yield of adding is a 10kg/ ton urea;
C, product urea is cooled to＜and to collect in the prilling tower bottom after 50 ℃ and send into screening, packaging process, tail gas generated by granulation is by the discharge emptying of prilling tower top.
Method of cooling of the present invention is applicable to fluidized bed prilling device, rotary drum granulator and the sprinkling pelleting tower of any specification model through repetition test; In process of cooling, the local temperature of urea can reduce by 2～5 ℃.
The shower nozzle that is used for spraying liquid in the prior art all can be used as the shower nozzle that is used to spray water coolant on fluidized bed prilling device of the present invention, rotary drum granulator and the sprinkling pelleting tower, can be according to the different concrete suitably shower nozzle of size of selecting of water consumption.Sprinkler head can be according to circumstances be set to a plurality of with water consumption different, it can keep the parallel installation of certain distance with the urea soln shower nozzle, through repetition test, mounting distance between two kinds of shower nozzles does not have influence to the carbamide granulation cooling performance, so concrete distance is not done further qualification at this, can do suitable adjustment at any time according to concrete unit type and practical situation; The sprinkling direction of water coolant is consistent with the sprinkling direction of urea soln.The used water of the present invention can be the high-temperature water of the cleanings that other equipment discharged such as boiler, and such second stage employ can effectively be saved the water source.
The present invention is the improvement that prior art is carried out compared with prior art, is the water that adds certain pressure and certain temperature in the process of urea cooling granulation, utilizes the vaporization phase transformation of liquid to absorb heat, reaches the effect of quick reduction temperature.Again because if the moisture content of urea hyperabsorption in granulation process can cause situations such as the inhomogeneous or downgrade of granulation, the inventor at this technological difficulties through repetition test draw when adding pressure be that it is into the water vapour shape when being 220～320 ℃ water for 0.6～1.6MPa, temperature, not only can fully contact with urea granules, absorb heat by the vaporization phase transformation and effectively reduce temperature, and satisfied the condition of urea crystals granulation, urea was absorbed water mostly occur phenomenons such as caking, guarantee the quality of carbamide granulation.
Advantage of the present invention and benefit:
1, new process of carbamide granulation cooling of the present invention, significantly reduced the consumption of cooling air, originally reduced more than 10% through the air amount ratio after the improvement technology, same exhaust emissions amount has also reduced more than 10%, energy-output ratio has been saved more than 20%, and the local temperature of carbamide granulation device has reduced by 2～5 ℃, and the water that the present invention sprayed is vaporous, can not influence the granulation of urea in the time of cooling again, effectively guarantee the quality of urea product.
2, the water of the present invention's adding is into the water vapour shape in described pressure and temperature scope, overcome the difficult point of prior art, water can fully be contacted with urea granules absorb the effect that heat reaches fast cooling, and can not influence the quality of carbamide granulation, make water consumption reach minimum simultaneously.
3, the used cooling water of the present invention can be the clean water of boiler or other equipment exhaustings or the clean high-temperature water behind the cooling step, can make the water second stage employ of discharging like this, has saved water resources.
Reduce energy consumption when 4, reducing the quantity discharged of cooling air consumption and cooling air, improved energy utilization rate, reduced cost, and the exhaust emissions amount is reduced, alleviated pollution on the environment greatly.
5, novel technique for cooling of the present invention does not increase step, is to cool off in granulation, can not prolong the production time.
Description of drawings
Fig. 1 is existing fluidized bed prilling device process flow diagram;
Fig. 2 is existing rotary drum granulator process flow diagram;
Fig. 3 is existing sprinkling pelleting tower process schematic flow sheet;
Fig. 4 is applied to fluidized bed prilling device process flow diagram for the present invention;
Fig. 5 is applied to the rotary drum granulator process flow diagram for the present invention;
Fig. 6 is applied to sprinkling pelleting tower process schematic flow sheet for the present invention.
Embodiment
Embodiment 1
As shown in Figure 4, a kind of new process of carbamide granulation cooling, it comprises the steps at the fluidized bed prilling device,
A, with 95%～99.7%, the urea soln of 135 ℃ of temperature enters the fluidized bed prilling device through pipeline, cooling air enters Fitz chilsonator through pipeline and forms fluidized-bed 1 ';
B, when urea enters the fluidized bed prilling device, utilizing shower nozzle to add pressure in fluidized-bed 1 ' is 220 ℃ water for 0.6MPa, temperature, the water yield of adding is a 10kg/ ton urea;
Flow into bucket elevator by fluidized-bed 1 ' after C, product urea are cooled to 90 ℃ and deliver to the screening operation, tail gas generated by granulation is discharged emptying after treatment by the Fitz chilsonator top.
After testing, the urea product total nitrogen (N) (in butt) 〉=46.4% produced of embodiment 1; Biuret≤0.9%; Water (H
2O) divide≤0.4%; MDU (in HCHO)≤0.6%; Granularity (d0.85mm～2.80mm, d1.18mm～3.35mm, d2.00mm～4.75mm, d4.00mm～8.00mm) 〉=93%; Outward appearance: white or lighter colored particles shape; Meet (GB2440-2001) premium grads standard of country's " urea ".
As shown in Figure 5, a kind of new process of carbamide granulation cooling, it comprises the steps at rotary drum granulator,
A, with 95%～99.7%, the urea soln of 135 ℃ of temperature enters rotary drum granulator one end through pipeline, cooling air enters rotary drum granulator 2 ' through pipeline;
B, when urea enters rotary drum granulator 2 ', utilizing shower nozzle to add pressure in rotary drum granulator 2 ' is 280 ℃ water for 1MPa, temperature, the water yield of adding is a 10kg/ ton urea;
Flow into bucket elevator by the rotary drum granulator 2 ' the other end after C, product urea are cooled to 90 ℃ and deliver to the screening operation, tail gas generated by granulation is discharged emptying after treatment by rotary drum granulator 2 '.
After testing, the urea product total nitrogen (N) (in butt) 〉=46.4% produced of embodiment 2; Biuret≤0.9%; Water (H
2O) divide≤0.4%; MDU (in HCHO)≤0.6%; Granularity (d0.85mm～2.80mm, d1.18mm～3.35mm, d2.00mm～4.75mm, d4.00mm～8.00mm) 〉=93%; Outward appearance: white or lighter colored particles shape; Meet (GB2440-2001) premium grads standard of country's " urea ".
As shown in Figure 6, a kind of new process of carbamide granulation cooling, it comprises the steps: at the sprinkling pelleting tower
A, with 95%～99.7%, the urea soln of 135 ℃ of temperature sprays downwards by sprinkling pelleting tower top through pipeline, cooling air enters sprinkling pelleting tower 3 ' by the bottom;
B, when urea enters prilling tower, utilizing shower nozzle to add pressure is 320 ℃ water on sprinkling pelleting tower 3 ' top for 1.6MPa, temperature, the water yield of adding is a 10kg/ ton urea;
C, product urea is cooled to＜and to collect in sprinkling pelleting tower 3 ' bottom after 50 ℃ and send into screening, packaging process, tail gas generated by granulation is by the discharge emptying of sprinkling pelleting tower 3 ' top.
After testing, the urea product total nitrogen (N) (in butt) 〉=46.4% produced of embodiment 3; Biuret≤0.9%; Water (H
2O) divide≤0.4%; MDU (in HCHO)≤0.6%; Granularity (d0.85mm～2.80mm, d1.18mm～3.35mm, d2.00mm～4.75mm, d4.00mm～8.00mm) 〉=93%; Outward appearance: white or lighter colored particles shape; Meet (GB2440-2001) premium grads standard of country's " urea ".
Claims (3)
1, a kind of carbamide granulation process for cooling, it comprises the steps, with 95%～99.7%, the urea soln of 135 ℃ of temperature enters the fluidized bed prilling device through pipeline, cooling air enters Fitz chilsonator through pipeline and forms fluidized-bed; Flow into bucket elevator by fluidized-bed after product urea is cooled to 90 ℃ and deliver to the screening operation, tail gas generated by granulation is discharged emptying after treatment by the Fitz chilsonator top; It is characterized in that: when urea soln entered the fluidized bed prilling device, utilizing shower nozzle to add pressure in fluidized-bed was that 0.6～1.6MPa, temperature are 220～320 ℃ water, and the water yield of adding is a 10kg/ ton urea.
2, a kind of carbamide granulation process for cooling, it comprises the steps, with 95%～99.7%, the urea soln of 135 ℃ of temperature enters rotary drum granulator one end through pipeline, cooling air enters this tablets press through pipeline; Flow into bucket elevator by this tablets press the other end after product urea is cooled to 90 ℃ and deliver to the screening operation, tail gas generated by granulation is discharged emptying after treatment by this tablets press; It is characterized in that: when urea soln entered rotary drum granulator, utilizing shower nozzle to add pressure in this tablets press was that 0.6～1.6MPa, temperature are 220～320 ℃ water, and the water yield of adding is a 10kg/ ton urea.
3, a kind of carbamide granulation process for cooling, it comprises the steps, with 95%～99.7%, the urea soln of 135 ℃ of temperature sprays downwards by sprinkling pelleting tower top through pipeline, cooling air enters this prilling tower by the bottom; Product urea is cooled to＜and to collect in this prilling tower bottom after 50 ℃ and send into screening, packaging process, tail gas generated by granulation is by this prilling tower top discharge emptying; It is characterized in that: when urea soln entered the sprinkling pelleting tower, utilizing shower nozzle to add pressure on this prilling tower top was that 0.6～1.6MPa, temperature are 220～320 ℃ water, and the water yield of adding is a 10kg/ ton urea.
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| CNB2006100889073A CN100497266C (en) | 2006-07-25 | 2006-07-25 | New process of carbamide granulation cooling |
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| CNB2006100889073A CN100497266C (en) | 2006-07-25 | 2006-07-25 | New process of carbamide granulation cooling |
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| CN101113108A CN101113108A (en) | 2008-01-30 |
| CN100497266C true CN100497266C (en) | 2009-06-10 |
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Non-Patent Citations (2)
| Title |
|---|
| 大颗粒尿素产品的水分问题. 茅启昌，张谦.大氮肥，第24卷第1期. 2001 |
| 大颗粒尿素产品的水分问题. 茅启昌，张谦.大氮肥，第24卷第1期. 2001 * |
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Owner name: BEIJING FUNGHAN ENGINEERING CONSULTING CO., LTD. Free format text: FORMER OWNER: WANG WEI Effective date: 20100831 Free format text: FORMER OWNER: XU YAOWU |
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Effective date of registration: 20100831 Address after: 100102 Beijing city Chaoyang District Lake Park B Botai International Center 122 floor 16 Patentee after: Beijing Funghan Engineering Consulting Co., Ltd. Address before: 100089 Beijing city Haidian District minzhuang Road No. 3 Yuquan Huigu Park Building No. 3 Co-patentee before: Xu Yaowu Patentee before: Wang Wei |
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Granted publication date: 20090610 Termination date: 20160725 |