CN100560547C - The method and apparatus of industrial production of membrane wrapping control-releasing fertilizer - Google Patents
The method and apparatus of industrial production of membrane wrapping control-releasing fertilizer Download PDFInfo
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- CN100560547C CN100560547C CNB2008101582907A CN200810158290A CN100560547C CN 100560547 C CN100560547 C CN 100560547C CN B2008101582907 A CNB2008101582907 A CN B2008101582907A CN 200810158290 A CN200810158290 A CN 200810158290A CN 100560547 C CN100560547 C CN 100560547C
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Abstract
The invention discloses a kind of method and apparatus of industrial production of membrane wrapping control-releasing fertilizer.Utilize gaseous media to make the fertiliser granulates in the fluidized-bed be in fluidization, simultaneously with the fertiliser granulates preheating, then the coating solution spraying for preparing is arrived fluidised fertiliser granulates surface, solvent volatilizees rapidly, and solute then forms fine and close film uniformly attached to the fertiliser granulates surface and utilizes the inventive method and device to produce coating controlled-release fertilizer.This process unit is simple to operate, can really realize continous way production, the solvent-free waste gas discharging of whole process of production, and the solvent practical efficiency can reach more than 99%.
Description
Technical field
The invention belongs to the coating controlled-release fertilizer production technical field, specifically relate to a kind of method and apparatus that adopts fluidization spraying coating method industrial production of membrane wrapping control-releasing fertilizer.
Background technology
Controlled release fertilizer is that according to the crop nutrition content demand, control nutrient releasing speed and burst size make nutrient release profiles and the corresponding to new-type fertilizer of crop demand at the special film of conventional fertilizers outer parcel one deck.The outstanding feature of this fertilizer is to supply with available nutrient synchronously according to the plant growth law curve, thereby the fertilizer nutrient effective rate of utilization is greatly improved, guaranteeing under the prerequisite of plant growth, with compare with concentration fertilizer, fertilizer efficiency can improve more than 50%, and the consumption of traditional fertilizer is significantly reduced.Because this fertilizer has the chemical fertilizer utilization ratio of raising, reduces usage quantity and fertilizer application frequency, reduces production costs, reduces environmental pollution, improves advantages such as crop products quality and saving chemical fertilizers production raw material, therefore be called as " 21 century high-tech environment-friendly fertilizer ", become the developing direction of fertilizer industry.
Because controlled release fertilizer has above advantage, China has also obtained some achievements also in the research of carrying out release and release control fertilizer in recent years.China's granted patent document " is the production method of the film-coated controlled release fertilizer of degradable membrane to reclaim thermoplastic resin " (CN1257136C, application number: 200410035783.3) disclosing a kind of is the production method of the film-coated controlled release fertilizer of degradable membrane to reclaim thermoplastic resin, though this method can reduce the cost of manufacture of coating controlled-release fertilizer, industrial scale is limited.Chinese patent literature " a kind of technology and equipment of making polymer coating controlled release fertilizer " (publication number: CN 101037371A, application number: 200710098613.3) also disclose a kind of technology and equipment of making polymer coating controlled release fertilizer, the industrial scale of this method is also very limited.
Because above research all is in laboratory or lab scale stage, technology is simple, be simply equipped, yield poorly, the production cost height, is not suitable for the industrial production of mass-producing.Therefore, a kind of controlled-release fertilizer production technology and equipment that is suitable for suitability for industrialized production only is provided, improve output, energy efficient, reduce production costs, could really strengthen the dynamics of applying of controlled release fertilizer, conscientiously accomplish to be increasing peasant income, simultaneously economic benefit and the social benefit of also bringing for country.
Summary of the invention
At the deficiencies in the prior art, the purpose of this invention is to provide a kind of method and apparatus of industrial production of membrane wrapping control-releasing fertilizer.
Technical scheme of the present invention is as follows:
The method of industrial production of membrane wrapping control-releasing fertilizer, utilize gaseous media to make the fertiliser granulates in the fluidized-bed be in fluidization, simultaneously with the fertiliser granulates preheating, then the coating solution spraying for preparing is arrived fluidised fertiliser granulates surface, solvent volatilizees rapidly, solute then forms fine and close film uniformly attached to the fertiliser granulates surface
Specifically comprise the steps:
A, with solute and solvent by weight 1: 20-30 adds dissolution kettle, is heated to 100～125 ℃ of stirring and dissolving, makes coating solution;
B, startup induced draft fan utilize preheater to be heated to 70-90 ℃ to gaseous media, are that solute weight 10-35 granulated fertilizer doubly adds fluidized-bed through feeding device then with weight, make granulated fertilizer be in stable fluidized state;
C, when treating that granulated fertilizer is heated to 45-50 ℃, coating solution is forced into 0.5～0.8MPa, dominant discharge is sprayed onto the granulated fertilizer surface, under the effect of gaseous media, solvent volatilizees rapidly, and solute then forms fine and close film uniformly attached to the fertiliser granulates surface, and discharging gets coating controlled-release fertilizer.
The industrialized preparing process of described coating controlled-release fertilizer, in preferred scheme, the gaseous media that comes out from fluidized-bed enters condenser condenses through induced draft fan, the solvent that condensation the is got off accumulator tank that desolvates is delivered to dissolution kettle through solvent pump and is utilized, cooled gaseous media enters fluidized-bed again through preheater, the tail gas of solvent recuperation groove and dissolution kettle truncates after gas recovering device handles, emptying up to standard.
The industrialized preparing process of described coating controlled-release fertilizer, in preferred scheme, discharging again after coating solution has all sprayed follow-up afterflow 2-3 minute among the step C.The purpose that continues fluidisation for some time is to make attached to the solute rete on granulated fertilizer surface more fine and close evenly, strengthens its coating effect.Enter next circulation after the discharging, this process needn't stop induced draft fan.
The industrialized preparing process of described coating controlled-release fertilizer, in preferred scheme, step B adds granulated fertilizer before the fluidized-bed, and elder generation sieves in the granulated fertilizer pretreatment unit, polished finish.Its objective is that sieve removes excessive too small particle, make granulated fertilizer slick and sly more, suitable more parcel coated fertilizer strengthens its coating effect.
The industrialized preparing process of described coating controlled-release fertilizer, described solute are this area conventional material, preferred new LDPE (film grade), recovery polyethylene etc.
The industrialized preparing process of described coating controlled-release fertilizer, described solvent are the conventional solvent in this area, are preferably the mixture of zellon or zellon and methylene dichloride.When solvent was selected the mixture of zellon and methylene dichloride for use, both can mix according to arbitrary proportion.
The industrialized preparing process of described coating controlled-release fertilizer, described gaseous media are air or nitrogen.
The present invention realizes the device of industrial production of membrane wrapping control-releasing fertilizer material, comprise feeding device, fluidized-bed, induced draft fan, condenser, preheater, the solvent recuperation groove, solvent pump, dissolution kettle, device for recovering tail gas, wherein, described fluidized-bed is provided with feeding device, the air outlet of described fluidized-bed is through induced draft fan, condenser and preheater are connected with the air intake of fluidized-bed, the condensate outlet of described condenser connects the solvent recuperation groove, described solvent recuperation groove is connected with dissolution kettle by solvent pump, the tail gas outlet of described solvent recuperation groove and dissolution kettle connects device for recovering tail gas, and the solvent outlet of described dissolution kettle is connected with fluidized-bed by solvent conduit.
In preferred scheme, the present invention realizes the device of industrial production of membrane wrapping control-releasing fertilizer material, also is provided with the granulated fertilizer pretreatment unit in described feeding device upstream.
In preferred scheme, the present invention realizes the device of industrial production of membrane wrapping control-releasing fertilizer material, also is provided with dumping device in described fluidized-bed bottom.
In preferred scheme, the present invention realizes the device of industrial production of membrane wrapping control-releasing fertilizer material, also is provided with the coating controlled-release fertilizer after-treatment device that links to each other with dumping device.
In preferred scheme, the present invention realizes the device of industrial production of membrane wrapping control-releasing fertilizer material, also is provided with strainer on dissolution kettle and solvent conduit that fluidized-bed is connected.
The gas that comes out from the fluidized-bed top is below induced draft fan enters condenser condenses to 40 ℃, the solvent that condensation the is got off accumulator tank that desolvates is delivered to dissolution kettle through solvent pump and is utilized, cooled gaseous media enters fluidized-bed through preheater, the gas recovering device emptying up to standard that truncates of the tail gas of solvent recuperation groove and dissolution kettle.
Compared with prior art, excellent effect of the present invention is:
1,, designed continuously the also technical process of industrialization production coating controlled-release fertilizer according to processing requirement.
2, designed complete suitability for industrialized production equipment according to processing requirement, throughput improves greatly, and energy consumption is lower greatly.
3, the solvent-free waste gas discharging of whole process of production, the solvent practical efficiency can reach more than 99%.
Description of drawings
Fig. 1 is the structural representation of embodiment 1 described device.
Fig. 2 is the structural representation of embodiment 2 described devices.
Fig. 3 is the structural representation of embodiment 3 described devices.
Wherein, 1. feeding device, 2. fluidized-bed, 3. induced draft fan, 4. condenser, 5. preheater, 6. solvent recuperation groove, 7. solvent pump, 8. dissolution kettle, 9. device for recovering tail gas, 10. dumping device, 11. granulated fertilizer pretreatment units, 12, strainer, 13, coating controlled-release fertilizer after-treatment device.
Embodiment
Describe the details and the working condition of the technical scheme of the present invention's proposition in detail below in conjunction with accompanying drawing, but be not limited thereto.
Embodiment 1:
The device of industrial production of membrane wrapping control-releasing fertilizer, structure as shown in Figure 1, comprise feeding device 1, fluidized-bed 2, induced draft fan 3, condenser 4, preheater 5, solvent recuperation groove 6, solvent pump 7, dissolution kettle 8, device for recovering tail gas 9, wherein, described fluidized-bed 2 is provided with feeding device 1, the air outlet of described fluidized-bed 2 is through induced draft fan 3, condenser 4 and preheater 5 are connected with the air intake of fluidized-bed 2, the condensate outlet of described condenser 4 connects solvent recuperation groove 6, described solvent recuperation groove 6 is connected with dissolution kettle 8 by holding agent pump 7, the tail gas outlet of described solvent recuperation groove 6 and dissolution kettle 8 connects device for recovering tail gas 9, and the solvent outlet of described dissolution kettle 8 is connected with fluidized-bed 2 by solvent conduit.
Embodiment 2:
The device of industrial production of membrane wrapping control-releasing fertilizer, structure as shown in Figure 2, different is also to be provided with granulated fertilizer pretreatment unit 11 in described feeding device 1 upstream with embodiment 1.
Embodiment 3:
The device of industrial production of membrane wrapping control-releasing fertilizer, structure also are provided with dumping device 10 with embodiment 1 or 2 in described fluidized-bed 2 bottoms as shown in Figure 2.
Embodiment 4:
The device of industrial production of membrane wrapping control-releasing fertilizer, structure as shown in Figure 3, different is also to be provided with the coating controlled-release fertilizer after-treatment device 13 that links to each other with dumping device 10 with embodiment 3.
Embodiment 5:
The device of industrial production of membrane wrapping control-releasing fertilizer, structure as shown in Figure 3, different is also is provided with strainer 12 on dissolution kettle 8 and solvent conduit that fluidized-bed 2 is connected with embodiment 4.
Embodiment 6: utilizing the described devices of embodiment 2 to produce the coating rates is 3% coating controlled-release fertilizer
The concrete operations step is as follows:
A, with 30kg new LDPE (film grade) (Beijing Yanshan Petrochemical Company of SINOPEC produce sell) and 600kg zellon adding dissolution kettle 8, be heated to 105 ℃ of stirring and dissolving, make coating solution;
B, start induced draft fan 3, utilize preheater 5 to give air heating to 70 ℃, then the 1000kg granulated fertilizer is gone into fluidized-bed 2 through feeding device 1, make granulated fertilizer be in stable fluidized state;
C, when treating that granulated fertilizer is heated to 45 ℃, coating solution is forced into 0.5～0.6MPa, dominant discharge is sprayed onto the granulated fertilizer surface in the fluidized-bed 2, under the effect of air, zellon volatilizees rapidly, and new LDPE (film grade) is then attached to the fertiliser granulates surface, form fine and close film uniformly gradually, when coating solution has all sprayed, continue fluidisation after 2-3 minute, the coating rate is 3% coating controlled-release fertilizer.
Also can be earlier with granulated fertilizer earlier through fertilizer pretreatment unit 11 sieve, polished finish, big or small evenly, the smooth surface granulated fertilizer is used further to coating.
Embodiment 7: utilizing the described devices of embodiment 3 to produce the coating rates is 5% coating controlled-release fertilizer
The concrete operations step is as follows:
A, 50kg new LDPE (film grade) and 1000kg zellon and 250kg dichloromethane mixture are added dissolution kettle 8, be heated to 100 ℃ of stirring and dissolving, make coating solution;
B, startup induced draft fan 3 utilize preheater 5 to be heated to 70 ℃ to nitrogen, then the 1000kg granulated fertilizer are gone into fluidized-bed 3 through feeding device 2, make granulated fertilizer be in stable fluidized state;
C, when treating that granulated fertilizer is heated to 50 ℃, coating solution is forced into 0.5～0.6MPa, dominant discharge is sprayed onto the granulated fertilizer surface in the fluidized-bed 2, under the effect of nitrogen, zellon and methylene dichloride volatilize rapidly, and new LDPE (film grade) is then attached to the fertiliser granulates surface, form fine and close film uniformly gradually, when coating solution has all sprayed, continue fluidisation after 2-3 minute, getting the coating rate by dumping device 10 dischargings is 5% coating controlled-release fertilizer.
Embodiment 8: utilizing embodiment 4 or 5 described devices to produce the coating rates is 10% coating controlled-release fertilizer
The concrete operations step is as follows:
A, 100kg new LDPE (film grade) and 3000kg zellon are added dissolution kettle 8, be heated to 125 ℃ of stirring and dissolving, make coating solution;
B, start induced draft fan 3, utilize preheater 5 to give air heating to 70 ℃, then the 1000kg granulated fertilizer is gone into fluidized-bed 2 through feeding device storehouse 2, make granulated fertilizer be in stable fluidized state;
C, when treating that granulated fertilizer is heated to 45 ℃, coating solution is forced into 0.5～0.6MPa, dominant discharge is sprayed onto the granulated fertilizer surface in the fluidized-bed 3, under the effect of air, zellon volatilizees rapidly, and new LDPE (film grade) is then attached to the fertiliser granulates surface, form fine and close film uniformly gradually, when coating solution has all sprayed, continue fluidisation after 2-3 minute, the coating rate is 10% coating controlled-release fertilizer.
Embodiment 9: utilizing embodiment 4 or 5 described devices to produce the coating rates is 11% coating controlled-release fertilizer
The concrete operations step is as follows:
A, 100kg new LDPE (film grade) and 3000kg zellon are added dissolution kettle 8, be heated to 125 ℃ of stirring and dissolving, make coating solution;
B, start induced draft fan 3, utilize preheater 5 to give air heating to 90 ℃, then the 3500kg granulated fertilizer is gone into fluidized-bed 2 through feeding device 1, make granulated fertilizer be in stable fluidized state;
C, when treating that granulated fertilizer is heated to 47 ℃, coating solution is forced into 0.5～0.6MPa, dominant discharge is sprayed onto the granulated fertilizer surface in the fluidized-bed 2, and under the effect of air, zellon volatilizees rapidly, new LDPE (film grade) is then attached to the fertiliser granulates surface, form fine and close film uniformly gradually,, enter the continuous spray of next cycle when coating solution has all sprayed, recirculation 3 times gets the coating rate and is about 11% coating controlled-release fertilizer.
Embodiment 10: utilizing embodiment 4 or 5 described devices to produce the coating rates is 10% coating controlled-release fertilizer
The concrete operations step is as follows:
A, 100kg is reclaimed polyethylene and 2800kg zellon add dissolution kettle 8, be heated to 120 ℃ of stirring and dissolving, make coating solution;
B, start induced draft fan 3, utilize preheater 5 to give air heating to 80 ℃, then the 2000kg granulated fertilizer is gone into fluidized-bed 2 through feeding device 1, make granulated fertilizer be in stable fluidized state;
C, when treating that granulated fertilizer is heated to 50 ℃, coating solution is forced into 0.5～0.6MPa, dominant discharge is sprayed onto the granulated fertilizer surface in the fluidized-bed 2, under the effect of air, zellon volatilizees rapidly, reclaim polyethylene then attached to the fertiliser granulates surface, form fine and close film uniformly gradually, the coating rate is 10% coating controlled-release fertilizer.
Claims (9)
1, the method for industrial production of membrane wrapping control-releasing fertilizer, it is characterized in that: utilize gaseous media to make the granulated fertilizer in the fluidized-bed (2) be in fluidization, simultaneously with the granulated fertilizer preheating, then the coating solution spraying is arrived fluidised granulated fertilizer surface, solvent evaporates, and solute forms fine and close film uniformly attached to the granulated fertilizer surface, and step is as follows:
A, with solute and solvent by weight 1: 20-30 adds dissolution kettle (8), is heated to 100～125 ℃ of stirring and dissolving, makes coating solution,
B, startup induced draft fan (3) utilize preheater (5) to be heated to 70-90 ℃ to gaseous media, are that solute weight 10-35 granulated fertilizer doubly adds fluidized-bed (2) through feeding device (1) then with weight, make granulated fertilizer be in stable fluidized state,
C, when treating that granulated fertilizer is heated to 45-50 ℃, coating solution is forced into 0.5～0.8MPa, dominant discharge is sprayed onto the granulated fertilizer surface, under the effect of gaseous media, solvent volatilizees rapidly, and solute then forms fine and close film uniformly attached to the granulated fertilizer surface, and discharging gets coating controlled-release fertilizer.
2, method according to claim 1, it is characterized in that, the gaseous media that comes out from fluidized-bed (2) enters condenser (4) condensation through induced draft fan (3), the solvent that condensation the is got off accumulator tank (6) that desolvates is delivered to dissolution kettle (8) through solvent pump (7) and is utilized, cooled gaseous media enters fluidized-bed (2) again through preheater (5), and the tail gas of solvent recuperation groove (6) and dissolution kettle (8) gas recovering device (9) that truncates is handled back emptying up to standard.
3, method according to claim 1 and 2 is characterized in that, step C discharging again after coating solution has all sprayed follow-up afterflow 2-3 minute.
4, method according to claim 1 and 2 is characterized in that, step B adds granulated fertilizer before the fluidized-bed, and elder generation sieves in granulated fertilizer pretreatment unit (11), polished finish.
5, realize the device of claim 1 or 2 described methods, it is characterized in that, comprise feeding device (1), fluidized-bed (2), induced draft fan (3), condenser (4), preheater (5), solvent recuperation groove (6), solvent pump (7), dissolution kettle (8), device for recovering tail gas (9), wherein, described fluidized-bed (2) is provided with feeding device (1), the air outlet of described fluidized-bed (2) is through induced draft fan (3), condenser (4) and preheater (5) are connected with the air intake of fluidized-bed (2), the condensate outlet of described condenser (4) connects solvent recuperation groove (6), described solvent recuperation groove (6) is connected with dissolution kettle (8) by solvent pump (7), the tail gas outlet of described solvent recuperation groove (6) and dissolution kettle (8) connects device for recovering tail gas (9), and the solvent outlet of described dissolution kettle (8) is connected with fluidized-bed (2) by solvent conduit.
6, device according to claim 5 is characterized in that, also is provided with granulated fertilizer pretreatment unit (11) in described feeding device (1) upstream.
7, device according to claim 5 is characterized in that, also is provided with dumping device (10) in described fluidized-bed (2) bottom.
8, device according to claim 7 is characterized in that, also is provided with the coating controlled-release fertilizer after-treatment device (13) that links to each other with dumping device (10).
9, device according to claim 5 is characterized in that, also is provided with strainer (12) on dissolution kettle (8) and solvent conduit that fluidized-bed (2) is connected.
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| CNB2008101582907A CN100560547C (en) | 2008-10-28 | 2008-10-28 | The method and apparatus of industrial production of membrane wrapping control-releasing fertilizer |
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| CN105110951A (en) * | 2015-09-06 | 2015-12-02 | 叶青军 | Production method and equipment of controlled-release fertilizer |
| CN110325289B (en) * | 2016-12-28 | 2022-04-08 | 沙特基础工业全球技术公司 | Solvent recovery from purge gas stream |
| CN108358698B (en) * | 2018-04-03 | 2021-03-30 | 合肥工业大学 | Sectional type fluidized bed coating device, coating process and coated green slow-release fertilizer |
| CN112939670A (en) * | 2021-03-25 | 2021-06-11 | 山东奥德鲁生物科技有限公司 | Hydrophobic slow-release organic-inorganic compound fertilizer preparation device and preparation method |
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Non-Patent Citations (2)
| Title |
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| 复混肥料生产技术手册. 方天翰主编，148-149，化学工业出版社. 2003 |
| 复混肥料生产技术手册. 方天翰主编，148-149，化学工业出版社. 2003 * |
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Application publication date: 20090325 Assignee: Henan post Land Technology Services Co., Ltd. Assignor: KINGENTA ECOLOGICAL ENGINEERING GROUP CO., LTD. Contract record no.: 2014410000054 Denomination of invention: Method and device for industrial production of membrane wrapping control-releasing fertilizer Granted publication date: 20091118 License type: Exclusive License Record date: 20140627 |
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