CN110090600B - Method for extruding fertilizer slurry into liquid drops and granular fertilizer - Google Patents
Method for extruding fertilizer slurry into liquid drops and granular fertilizer Download PDFInfo
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- CN110090600B CN110090600B CN201810090980.7A CN201810090980A CN110090600B CN 110090600 B CN110090600 B CN 110090600B CN 201810090980 A CN201810090980 A CN 201810090980A CN 110090600 B CN110090600 B CN 110090600B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/20—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by expressing the material, e.g. through sieves and fragmenting the extruded length
Abstract
The invention provides a method for extruding fertilizer slurry into liquid drops, which comprises the following steps: extruding the fertilizer slurry out of the first discharging part; the fertilizer slurry extruded from the first discharging part is cut by a second discharging part again to form liquid drops, and the liquid drops are discharged from the second discharging part; wherein the direction of cutting of the second discharging member intersects the direction of extrusion of the fertilizer slurry from the first discharging member. The method for extruding the fertilizer slurry into the liquid drops can enable the fertilizer slurry to form the liquid drops uniformly, the size of the liquid drops can be rapidly cooled in a short time, the formed fertilizer particles meet the fertilizer standard, the forming speed of the liquid drops is moderate, and the large-scale production can be realized.
Description
Technical Field
The invention relates to the technical field of fertilizer chemical industry, in particular to a method for extruding fertilizer slurry into liquid drops and a granular fertilizer.
Background
In the prior art, the production method of the fertilizer mainly adopts a high tower granulation technology. The high tower granulation is to adopt molten urea and raw materials such as phosphorus, potassium and the like to prepare mixed slurry under the condition of fully mixing, spray the mixed slurry from the top of the high tower, enable the mixed slurry liquid drop to interact with air resistance rising from the tower bottom in the descending process of the high tower, cool the mixed slurry liquid drop after heat exchange with the air resistance to form granular materials, fall to the tower bottom, fall the granular materials at the tower bottom, and obtain the granular compound fertilizer after screening treatment. However, the construction and maintenance of the high tower at present need higher cost, and the low tower granulation is adopted instead, fertilizer slurry is sprayed from the top, and due to insufficient height, the cooling of fertilizer liquid drops is uneven, and ideal fertilizer products cannot be produced.
201710800.5 discloses a fertilizer granulation experimental apparatus, it includes the base, install driving motor and prilling granulator on the base, driving motor is connected with prilling granulator, prilling granulator includes inner skleeve and outer sleeve, the axis coincidence of inner skleeve and outer sleeve, wherein the internally mounted of inner skleeve has spiral fan blade, the outer surface welding of inner skleeve has the puddler of equipartition, outside parcel at the outer sleeve has heating device, it is provided with the granulation hole on the inner skleeve. The technique is to extrude fertilizer out of a granulation hole by using pressure from an inner sleeve, and to control the size of liquid drops formed by spraying the granulation hole by using the change of the pressure. However, the technology has a limit on the viscosity of the liquid, and when the viscosity is too high, spray cannot be formed, so that the effect of the technology applied to the industrial production of fertilizers is poor.
Disclosure of Invention
In view of this, the invention provides a method for uniformly spraying fertilizer slurry from a discharge port and uniformly spraying liquid drops, and the specific technical scheme is as follows:
a method of extruding a fertilizer slurry into droplets, the method of extruding a fertilizer slurry into droplets comprising:
extruding the fertilizer slurry out of the first discharging part;
the fertilizer slurry extruded from the first discharging part is cut by a second discharging part again to form liquid drops, and the liquid drops are discharged from the second discharging part; wherein the direction of cutting of the second discharging member intersects the direction of extrusion of the fertilizer slurry from the first discharging member.
Preferably, the direction in which the fertilizer slurry is extruded from the first discharging member is a first direction, the direction in which the second discharging member is cut is a second direction, and the first direction and the second direction are perpendicular to each other.
Preferably, the first direction is a vertically downward direction, and the second direction is a horizontal direction.
Preferably, the first discharging part comprises a plurality of first discharging holes, and the second discharging part comprises a plurality of second discharging holes; the aperture of the first discharging hole is 0.5-5 mm, and the aperture of the second discharging hole is 0.5-20 mm.
Preferably, the pressure of the fertilizer slurry passing through the first discharging part is 0.3-1.6MPa, and the viscosity of the fertilizer slurry is 1000-20000 centipoises.
Preferably, the pressure of the fertilizer slurry passing through the first discharging part is 0.8-1.6MPa, and the viscosity of the fertilizer slurry is 10000-20000 centipoises.
Preferably, the distance between the first discharging part and the second discharging part is 0.5-20 mm.
Preferably, in the step of cutting the fertilizer slurry extruded from the first discharging member into droplets by the second discharging member, the frequency of cutting the fertilizer slurry by the second discharging member is 360 to 3600 times/min.
Preferably, the second discharging member cuts the fertilizer slurry at a frequency of 600 to 3600 times/min.
The invention also provides a granular fertilizer, and a preparation method of the granular fertilizer comprises a method for extruding the fertilizer slurry into liquid drops.
The invention has the beneficial effects that: the method for extruding the fertilizer slurry into the liquid drops can enable the fertilizer slurry to uniformly form the liquid drops, the size of the liquid drops can be rapidly cooled in a short time, the formed fertilizer particles meet the fertilizer standard, the forming speed of the liquid drops is moderate, and the large-scale production can be realized. The method can be applied to low tower granulation.
Drawings
Fig. 1 is a flow chart of a method for extruding fertilizer slurry into droplets according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an intelligent aerosol apparatus according to an embodiment of the present invention.
Fig. 3 is a partially enlarged view of the extrusion cutting position of the device for the method for extruding the fertilizer slurry into the liquid drops, which is provided by the embodiment of the invention.
Detailed Description
While the following is a description of the preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
The terms "first," "second," and the like in the description and in the claims, and in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Examples
Referring to fig. 1, an embodiment of the present invention provides a method for extruding a fertilizer slurry into droplets, where the method for extruding a fertilizer slurry into droplets includes steps S10 and S20. The specific steps are as follows.
Step S10: the fertilizer slurry is extruded out of the first discharge member.
The fertilizer slurry is prepared by mixing one or more of nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, medium trace element fertilizer, organic carbon fertilizer, microbial fertilizer and the like to form fertilizer slurry, wherein the mixing mode can be primary mixing, secondary mixing, tertiary mixing and the like, and the conditions of the mixing sequence, the temperature, the pH value and the like of the fertilizer slurry are not limited and can be adjusted according to the characteristics and the mixing requirements of the raw material components of the fertilizer slurry.
The first discharging part is a part for extruding fertilizer slurry, namely the fertilizer slurry is concentrated to one side of the first discharging part under the action of pressure, and the fertilizer slurry is extruded to form strip-shaped fertilizer slurry on the other side of the first discharging part under the action of pressure. It is understood that the first discharging member may be, but not limited to, circular, conical, cylindrical, square, etc., wherein the "member" may also be expressed by other terms such as device, equipment, etc.
Step S20: and cutting the fertilizer slurry extruded from the first discharging part by a second discharging part to form liquid drops, and discharging the liquid drops from the second discharging part, wherein the cutting direction of the second discharging part is intersected with the extruding direction of the fertilizer slurry from the first discharging part. The direction of the fertilizer slurry extruded from the first discharging component is intersected with the cutting direction of the first discharging component, so that the fertilizer slurry can be cut into a droplet shape, and the fertilizer can be uniformly dispersed in an extruded manner. The second discharging part is used for cutting the fertilizer slurry strip extruded from the first discharging part and throwing the fertilizer liquid drops formed after cutting out from the first discharging part.
In a further embodiment, the direction of extrusion of the fertilizer slurry from the first discharging member is a first direction, and the direction of cutting by the second discharging member is a second direction, and the first direction and the second direction are perpendicular to each other. When the first direction is perpendicular to the second direction, that is, the cutting direction is perpendicular to the direction in which the fertilizer slurry is extruded, the fertilizer slurry can be cut quickly and uniformly to form droplets. The fertilizer slurry is still in a flowing liquid state after being extruded from the first discharging part, and the longer the fertilizer slurry stays in the air, the more the fertilizer slurry can be diffused, and if the fertilizer slurry can be cut off quickly in time, liquid drops with uniform sizes can be formed. Furthermore, the pressure of the fertilizer slurry extruded from the first discharging member is maximum at the first discharging member and gradually decreases as the pressure is farther from the first discharging member, so that the components in the fertilizer droplets can be uniformly distributed by cutting in a vertical intersecting manner.
In a further embodiment, the first outfeed member comprises a plurality of first outfeed holes. The step of extruding the fertilizer slurry out of the first discharging part is to extrude the fertilizer slurry out of a first discharging hole, wherein the aperture of the first discharging hole is 0.5-5 mm, and the fertilizer slurry is extruded out of the air with the aperture of 0.5-5 mm to form a strip-shaped fertilizer slurry strip. The second discharging component comprises a plurality of second discharging holes. The fertilizer slurry extruded from the first discharging part is cut by the second discharging part to form liquid drops, and is discharged from the second discharging part. The' refers to that the fertilizer slurry extruded from the first discharging hole is cut off by the second discharging hole and thrown out of fertilizer liquid drops, and the aperture of the second discharging hole is 0.5-20 mm. When the aperture of the second discharging hole is larger than that of the first discharging hole, the fertilizer slurry strips can be smoothly cut off and thrown away, so that the fertilizer liquid drops are dispersed more uniformly.
Referring to fig. 2 and 3, in a further embodiment, the first direction is a vertical downward direction, and the second direction is a horizontal direction. The innovations of the embodiments of the present invention are described in conjunction with fig. 2 and 3. Fertilizer ground paste 10 extrudes from first ejection of compact part 20 under the effect of pressure, extrudes through first discharge opening 21 on the first ejection of compact part 20, and the direction of extruding from first discharge opening 21 is vertical direction B, promptly the direction of the ejection of compact of first discharge opening 21 is vertical down. The fertilizer slurry 10 extruded from the first discharging hole 21 is in a strip shape, that is, a fertilizer slurry strip 11 is formed, the fertilizer slurry strip 11 is cut by the second discharging hole 31 on the second discharging member 30, which is substantially the same as that the second discharging hole 31 is provided in the second discharging member 30, the second discharging holes 31 are spaced by the cutting part 32, the fertilizer slurry strip 11 is cut by the cutting part 32 from the horizontal direction a, and then is cut to form fertilizer droplets 12 which are thrown out from the second discharging hole 31. Wherein the second discharging member 30 rotates around the first discharging member 20, the direction of the rotation is clockwise direction C, when the second discharging hole 31 in the second discharging member 30 rotates to the position where the fertilizer slurry strip 11 is extruded, i.e. the fertilizer slurry strip 11 is cut off in horizontal direction a. It will be appreciated that the cutting direction is not the horizontal direction a but the direction tangential to the clockwise direction C during the course of the second outfeed opening 31 being intended to be rotated to the lowest position or after passing through the lowest position. It is understood that the second discharging member 30 may also be rotated counterclockwise around the first discharging member 20.
In a further embodiment, the pressure of said fertilizer slurry through said first discharge member is 0.3-1.6MPa and the viscosity of said fertilizer slurry is 1000-20000 centipoise. The pressure in the first discharging part and the viscosity of the fertilizer slurry are in the range, so that the discharged fertilizer liquid drops are more uniform. And the fertilizer liquid drops can be extruded out of the first discharging part fast enough to meet the requirement of large-scale production.
In a further embodiment, the pressure of the fertilizer slurry passing through the first discharging part is 0.8-1.6MPa, and the viscosity of the fertilizer slurry is 10000-20000 centipoise. This embodiment is a preferred embodiment of the present invention, and is preferably within the above range.
In a further embodiment, the distance between the first discharging member and the second discharging member is 0.5 to 20 mm. The distance is the distance between a second discharging hole and the first discharging hole, and if the second discharging part is a circular device rotating around the first discharging part, the distance is the distance between the first discharging part and the lowest point of the second discharging part. The distance between the first discharging part and the second discharging part is within the range, so that the fertilizer slurry strips can be cut off in time, and the components of the formed fertilizer liquid drops are more uniform.
In a further embodiment, the frequency of cutting the fertilizer slurry by the second discharging member in the "fertilizer slurry extruded from the first discharging member is cut by the second discharging member to form droplets" is 360-3600 times/min.
In a further embodiment, the second discharge member severs the fertilizer slurry at a frequency of 600 to 3600 times per minute. The frequency of severing the fertilizer slurry by the second discharge member is substantially the frequency of severing the strips of fertilizer slurry. It can be understood that if the second discharging member has a circular shape, the number of the second discharging member is 50 to 300 rpm when there are 12 second discharging holes in one turn of the second discharging member. At this frequency, the size of the fertilizer droplets formed meets the fertilizer production standards. If the frequency of cutting the fertilizer is low, namely the cutting time is prolonged, the fertilizer slurry strips are extruded for a longer time, and when the fertilizer is finally cut, each formed fertilizer drop is large, so that the fertilizer production requirement cannot be met.
The invention also provides a granular fertilizer, and a preparation method of the granular fertilizer comprises a method for extruding the fertilizer slurry into liquid drops.
In a further embodiment, the method of preparing a granular fertilizer further comprises the step of cooling the fertilizer droplets into granules.
Comparative examples
In order to illustrate the effects of the above technical solutions, the present invention also provides the following comparative examples for illustration. Please refer to table 1. Wherein P represents the pressure of the fertilizer slurry passing through the first discharging part, mu represents the viscosity of the fertilizer slurry, D1 represents the aperture of the first discharging hole, D2 represents the aperture of the second discharging hole, D represents the distance between the first discharging part and the second discharging part, and f represents the frequency of cutting off the fertilizer slurry strip by the second discharging part.
Table 1 comparative example parameters
| P(Mpa) | Mu (centipoise) | D1 (millimeter) | D2 (millimeter) | d (millimeter) | f (times/minute) | |
| Example 1 | 1.6 | 15000 | 3 | 10 | 25 | 600 |
| Comparative example 1 | 0.1 | 15000 | 3 | 10 | 25 | 600 |
| Comparative example 2 | 1.6 | 100 | 3 | 10 | 25 | 600 |
| Comparative example 3 | 1.6 | 15000 | 8 | 5 | 25 | 600 |
| Comparative example 4 | 1.6 | 15000 | 3 | 10 | 100 | 600 |
| Comparative example 5 | 1.6 | 15000 | 3 | 10 | 25 | 100 |
Granular fertilizers were prepared from the fertilizer slurry using the parameters of example 1 and comparative examples 1-5 above, and it was found that example 1 produced a uniform particle size, standard size compound fertilizer. The fertilizer produced in comparative examples 1 to 5 had a non-uniform particle size and did not meet the requirements. In comparative example 1, the extrusion pressure P was reduced, so that the resulting granulated fertilizer was smaller. In comparative example 2, the viscosity was lowered, and the formed particles were not uniform in shape, and were not shaped in some cases. In comparative example 3, because D1 is greater than D2, the speed of fertilizer droplet formation is greatly reduced, large-scale life is impossible, and fertilizer slurry is accumulated between the first discharging part and the second discharging part, which affects production. The fertilizer granules may become large and the molding is not visually uniform in comparative example 4 and comparative example 5.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. A method of extruding a fertilizer slurry into droplets, the method comprising:
extruding the fertilizer slurry out of the first discharging part;
the fertilizer slurry extruded from the first discharging part is cut by a second discharging part to form liquid drops, and the liquid drops are discharged from the second discharging part; wherein the direction of cutting of the second discharging member intersects the direction of extrusion of the fertilizer slurry from the first discharging member;
the first discharging part comprises a plurality of first discharging holes, and the second discharging part comprises a plurality of second discharging holes; the aperture of the first discharging hole is 3 mm, the aperture of the second discharging hole is 10 mm, and the distance between the first discharging part and the second discharging part is 25 mm;
the pressure of the fertilizer slurry passing through the first discharging part is 1.6MPa, and the viscosity of the fertilizer slurry is 15000 centipoises;
the frequency of the second discharging part cutting off the fertilizer slurry is 600 times/min.
2. The method of claim 1, wherein the direction of extrusion of the fertilizer slurry from the first discharge member is a first direction, the direction of cutting of the second discharge member is a second direction, and the first direction and the second direction are perpendicular to each other.
3. A method of extruding a fertilizer slurry into droplets as recited in claim 2 wherein said first direction is a vertical downward direction and said second direction is a horizontal direction.
4. A granulated fertilizer, characterized in that it is produced by a process comprising a method of extruding a fertilizer slurry according to any one of claims 1 to 3 into droplets.
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| DE3530508A1 (en) * | 1985-08-27 | 1987-03-12 | Santrade Ltd | Appliance for extruding flowable compositions |
| CN2037735U (en) * | 1988-02-05 | 1989-05-17 | 杭州龙山化工厂 | Granulator for ammonium-chloride monomer |
| JP2954939B1 (en) * | 1998-09-25 | 1999-09-27 | アムコン株式会社 | Pelletizer |
| CN201168591Y (en) * | 2008-02-03 | 2008-12-24 | 上海瑞宝造粒机有限公司 | Rotary type granulator apparatus for squeezing flowable material |
| US7985393B2 (en) * | 2009-03-31 | 2011-07-26 | Uop Llc | Pastillation of ammonium sulfate nitrate |
| CN102079679B (en) * | 2010-12-16 | 2013-02-27 | 福建省大德投资发展有限公司 | Fertilizer concentrating and forming machine |
| DE102014217603A1 (en) * | 2014-09-03 | 2016-03-03 | Sandvik Materials Technology Deutschland Gmbh | Process and apparatus for producing L-menthol in solid form |
| CN106334495B (en) * | 2016-10-31 | 2018-09-21 | 重庆市南川区庆岩福利碱厂 | Granulating mechanism with automatic clearing function |
| CN107175044A (en) * | 2017-07-18 | 2017-09-19 | 广西容县宏旺树脂有限公司 | A kind of particle disproportionated rosin former |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203750503U (en) * | 2014-03-12 | 2014-08-06 | 山东戴瑞克新材料有限公司 | Discharging pore plate of granulating machine with gradient-type pore diameter |
| CN106334494A (en) * | 2016-10-31 | 2017-01-18 | 重庆市南川区庆岩福利碱厂 | Pelleting collecting device |
| CN107583570A (en) * | 2017-08-24 | 2018-01-16 | 广西力源宝科技有限公司 | A kind of organic fertilizer granulator mold |
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