System capable of simultaneously producing two compound fertilizers with different formulas

Abstract

The utility model belongs to a system capable of simultaneously producing two compound fertilizers with different formulas. Comprising a urea melt pipeline and a compound fertilizer high-tower granulation unit, the compound fertilizer high-tower granulation unit comprises a granulation tower, an outlet of the granulation tower is connected with an inlet of a first screening machine used for screening large-particle fertilizer, and a qualified product outlet of the first screening machine is connected with an inlet of a second screening machine used for screening small-particle fertilizer; a small granular fertilizer outlet of the second screening machine is connected with the roller fluidized bed granulation unit; the urea melt liquid pipeline is respectively connected with the compound fertilizer high tower granulation unit and the roller fluidized bed granulation unit; the fertilizer with unqualified particle size in the high-tower granulation unit of the compound fertilizer is shunted, the returned material is heated by using the molten urea, so that the characteristics of energy conservation and consumption reduction are achieved, and meanwhile, the small-particle fertilizer is used as the seed crystal and is matched with the roller fluidized bed granulation unit to produce a second variety of formula compound fertilizer; therefore, the characteristic of variety diversification of the compound fertilizer is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of compound fertilizer production, specifically a system of two different formula compound fertilizer can be produced simultaneously. BACKGROUND

[0002] The production procedure of compound fertilizer high tower process mainly includes: solid raw material conveying, raw material melting mixing, granulation, drum cooling, screening, powder flow cooling, coating, packaging. The unqualified compound fertilizer (including large particle compound fertilizer and small particle compound fertilizer) screened in the foregoing screening process needs to pass through the return material into the raw material melting mixing section to re-melt, according to the measurement, only small particle compound fertilizer accounts for about 25% of the total amount of fertilizer (for example, the particle size of 2.0~4.5mm, the particle size below 2.0 is called small particle fertilizer), the above production process has the following defects: 1, the process of return material needs to consume a large amount of energy, that is, the molten slurry (urea ammonium nitrate) needs to be heated by cooperating with steam to make the return material become a molten state to achieve the characteristics of facilitating granulation; 2, the above production method can only produce one variety formula compound fertilizer, and there is the defect of single variety of compound fertilizer. CONTENT

[0003] In order to make up for the above shortcomings, the utility model provides a system of two different formula compound fertilizer can be produced simultaneously to solve the technical problems existing in the prior art.

[0004] The utility model adopts the technical scheme that:

[0005] A system of two different formula compound fertilizer can be produced simultaneously, the system includes urea molten liquid pipeline and compound fertilizer high tower granulation unit, the compound fertilizer high tower granulation unit at least includes the granulation tower, the outlet of the granulation tower is connected with the first screening machine import for screening large particle fertilizer, the first screening machine qualified product outlet is connected with the second screening machine import for screening small particle, the small particle fertilizer outlet of the second screening machine is connected with the drum fluidized bed granulation unit, the urea molten liquid pipeline is connected with the compound fertilizer high tower granulation unit and the drum fluidized bed granulation unit respectively.

[0006] The utility model has the advantages that: the utility model is coupled with the drum fluidized bed granulation unit by the transformation of the compound fertilizer high tower granulation unit, so that the fertilizer with unqualified particle size in the compound fertilizer high tower granulation unit is shunted, so that the return material is heated by using the molten urea to achieve the characteristics of energy saving and consumption reduction, and the small particle fertilizer in the compound fertilizer high tower granulation unit is used as the crystal seed to cooperate with the drum fluidized bed granulation unit to produce the second variety formula compound fertilizer, so that the characteristics of compound fertilizer variety diversification are achieved.

[0007] Preferably, the drum fluidized bed granulation unit comprises a drum fluidized bed granulator, the product outlet of the drum fluidized bed granulator is connected with a small particle screening machine, a large particle screening machine, a fluidized bed granulation cooler, a fluidized bed granulation coating machine and a fluidized bed granulation packaging machine in sequence.

[0008] Preferably, the qualified product outlet of the second screening machine is connected with a cooler, a coating machine and a packaging machine in sequence.

[0009] Preferably, the tail gas outlet of the drum fluidized bed granulator, the tail gas outlet of the small particle screening machine, the tail gas outlet of the large particle screening machine, the tail gas outlet of the fluidized bed granulation cooler, the tail gas outlet of the first screening machine, the tail gas outlet of the second screening machine and the tail gas outlet of the cooler are connected with the inlet of a tail gas washing tower respectively, and the liquid phase outlet of the tail gas washing tower is connected with a urea melt liquid pipeline entering the drum fluidized bed granulator.

[0010] Preferably, the inlet of the drum fluidized bed granulator is connected with a urea melt liquid pipeline, the small particle fertilizer outlet of the second screening machine, the small particle fertilizer outlet of the small particle screening machine and the large particle fertilizer outlet of the large particle screening machine; the large particle fertilizer outlet of the large particle screening machine is connected with the inlet of the drum fluidized bed granulator through a crusher.

[0011] Preferably, the fluidization air inlet of the drum fluidized bed granulator is connected with an air pipeline through a fluidization air fan, and the cooling air inlet of the drum fluidized bed granulator is connected with an air pipeline through a cooling air fan.

[0012] Preferably, the compound fertilizer high tower granulation unit further comprises a phosphorus element supply part, a potassium element supply part and a medium and trace element supply part; the inlet of the first mixing tank in the phosphorus element supply part is connected with a urea melt liquid pipeline, the outlet of the first mixing tank in the phosphorus element supply part is connected with the inlet of the second mixing tank in the potassium element supply part, the outlet of the second mixing tank is connected with the inlet of the granulation tower through a third mixing tank, and the third high tower elevator of the medium and trace element supply part is connected with the inlet of the second mixing tank.

[0013] Preferably, the large particle fertilizer outlet of the first screening machine is connected with the inlet of the third high tower elevator.

[0014] Preferably, the phosphorus element supply part comprises a phosphorus element storage tank, the phosphorus element storage tank is connected with a first metering belt through a phosphorus element crusher, the first metering belt is connected with the inlet of the first mixing tank through a first high tower elevator; the potassium element supply part comprises a potassium element storage tank, the potassium element storage tank is connected with a second metering belt through a potassium element crusher, the second metering belt is connected with the inlet of the second mixing tank through a second high tower elevator; and the medium and trace element supply part comprises a medium and trace element storage tank, the medium and trace element storage tank is connected with the third high tower elevator through a medium and trace element crusher and a third metering belt.

[0015] The system for simultaneously producing two different formula compound fertilizers according to the technical scheme has the effects of saving energy consumption and reducing production cost on the basis of producing two different formula compound fertilizers by reforming the original compound fertilizer high tower granulation unit and coupling the reforming unit with the roller fluidized bed granulation unit, specifically, the large particle fertilizer in the compound fertilizer high tower granulation unit is returned into the compound fertilizer high tower granulation unit for repeated use, and the small particle fertilizer is fed into the roller fluidized bed granulation unit for compound fertilizer granulation, the above-mentioned flow separation can save the energy consumption of the molten return material, and the characteristics of simultaneously producing two formula compound fertilizers are realized, further, the tail gas in the compound fertilizer high tower granulation unit and the roller fluidized bed granulation unit is concentrated for treatment in the utility model to achieve the characteristics of reaching the standard discharge and being environment-friendly, further, the recycling of the washing liquid can be realized, so that the characteristics of reducing the fertilizer production cost are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] In the figure: 1, urea molten liquid pipeline; 2, phosphorus element storage tank; 3, phosphorus element crusher; 4, first metering belt; 5, first high tower elevator; 6, first mixing tank; 7, potassium element storage tank; 8, potassium element crusher; 9, second metering belt; 10, second high tower elevator; 11, second mixing tank; 12, trace element storage tank; 13, trace element crusher; 14, third metering belt; 15, third high tower elevator; 16, third mixing tank; 17, granulation tower; 18, first screening machine; 19, second screening machine; 20, roller fluidized bed granulator; 21, small particle screening machine; 22, large particle screening machine; 23, fluidized bed granulation cooler; 24, fluidized bed granulation coating machine; 25, fluidized bed granulation packaging machine; 26, cooler; 27, coating machine; 28, packaging machine; 29, tail gas washing tower; 30, crusher; 31, fluidizing fan; 32, air pipeline; 33, cooling fan. DETAILED DESCRIPTION

[0019] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] The following will be described in detail in combination with the drawings in the embodiments of the present application, and obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Figure 1 The present application is further described in detail, and the present application is a system capable of simultaneously producing two different formula compound fertilizers, which comprises a urea melt liquid pipeline 1 and a compound fertilizer high tower granulation unit, the compound fertilizer high tower granulation unit at least comprises a granulation tower 17, the outlet of the granulation tower 17 is connected with the inlet of a first screening machine 18 for screening large particle fertilizers, the qualified product outlet of the first screening machine 18 is connected with the inlet of a second screening machine 19 for screening small particles, and the small particle fertilizer outlet of the second screening machine 19 is connected with a rotary drum fluidized bed granulation unit; the urea melt liquid pipeline 1 is connected with the compound fertilizer high tower granulation unit and the rotary drum fluidized bed granulation unit respectively. In the present application, coupling is realized between the compound fertilizer high tower granulation unit and the rotary drum fluidized bed granulation unit, so as to realize the purpose of producing different types of compound fertilizers on the basis of saving energy consumption, wherein the large particle fertilizers screened by the first screening machine 18 are used to enter the compound fertilizer high tower granulation unit to realize the return of materials, the small particle fertilizers screened by the second screening machine 19 enter the rotary drum fluidized bed granulation unit to be used for preparing high-nitrogen compound fertilizers, the fertilizers screened by the above are divided into streams, so as to realize the characteristics of reducing energy consumption, and different varieties of compound fertilizers can also be produced; the granulation tower 17 in the present application is internally provided with a granulator, and the compound fertilizer slurry enters the granulator in the interior of the granulation tower 17 to be granulated, which is the prior art and thus will not be described in detail.

[0021] Further, the rotary drum fluidized bed granulation unit comprises a rotary drum fluidized bed granulator 20, the product outlet of the rotary drum fluidized bed granulator 20 is sequentially connected with a small particle screening machine 21, a large particle screening machine 22, a fluidized bed granulation cooler 23 and a fluidized bed granulation coating machine 24, and is connected with a fluidized bed granulation packaging machine 25.

[0022] Further, the qualified product outlet of the second screening machine 19 is sequentially connected with a cooler 26 and a coating machine 27, and is connected with a packaging machine 28.

[0023] Further, the tail gas outlet of the drum fluidized bed granulator 20, the tail gas outlet of the small particle screening machine 21, the tail gas outlet of the large particle screening machine 22, the tail gas outlet of the fluidized bed granulator cooler 23, the tail gas outlet of the first screening machine 18, the tail gas outlet of the second screening machine 19 and the tail gas outlet of the cooler 26 are connected with the inlet of the tail gas washing tower 29 respectively, and the liquid phase outlet of the tail gas washing tower 29 is connected with the urea melt liquid pipeline 1 entering the drum fluidized bed granulator 20. Through the above setting, the compound fertilizer production workshop can be prevented from being polluted by dust, the dust is recycled, the tail gas is discharged up to the standard, the environment is friendly and the production cost is reduced.

[0024] Further, the inlet of the drum fluidized bed granulator 20 is connected with the urea melt liquid pipeline 1, the small particle fertilizer outlet of the second screening machine 19, the small particle fertilizer outlet of the small particle screening machine 21 and the large particle fertilizer outlet of the large particle screening machine 22, and the large particle fertilizer outlet of the large particle screening machine 22 is connected with the inlet of the drum fluidized bed granulator 20 through the crusher 30. Through the above setting, the returned material can be recycled and reused; essentially, the above setting of the utility model realizes the recycling of the small particle fertilizer in the compound fertilizer high tower granulation unit and the large particle fertilizer and the small particle fertilizer in the drum fluidized bed granulation unit under the premise of reducing energy consumption.

[0025] Further, the fluidization air inlet of the drum fluidized bed granulator 20 is connected with the air pipeline 32 through the fluidization air fan 31, and the cooling air inlet of the drum fluidized bed granulator 20 is connected with the air pipeline 32 through the cooling air fan 33. Through the setting of the fluidization air fan 31 and the cooling air fan 33, the fluidization air and the cooling air can be entered according to the actual situation in the drum fluidized bed granulator 20, not only the convenience of control is achieved, but also the purpose of saving power consumption is achieved.

[0026] Further, the compound fertilizer high tower granulation unit further comprises a phosphorus element supply part, a potassium element supply part and a middle and trace element supply part; the inlet of the first mixing tank 6 in the phosphorus element supply part is connected with the urea melt liquid pipeline 1, the outlet of the first mixing tank 6 in the phosphorus element supply part is connected with the inlet of the second mixing tank 11 in the potassium element supply part, the outlet of the second mixing tank 11 is connected with the inlet of the granulation tower 17 through the third mixing tank 16, and the third high tower elevator 15 of the middle and trace element supply part is connected with the inlet of the second mixing tank 11.

[0027] Further, the large particle fertilizer outlet of the first screening machine 18 is connected with the inlet of the third high tower elevator 15.

[0028] Further, the phosphorus element supply part comprises a phosphorus element storage tank 2, the phosphorus element storage tank 2 is connected with a first metering belt 4 through a phosphorus element crusher 3, the first metering belt 4 is connected with an inlet of a first mixing tank 6 through a first high tower elevator 5; the potassium element supply part comprises a potassium element storage tank 7, the potassium element storage tank 7 is connected with a second metering belt 9 through a potassium element crusher 8, the second metering belt 9 is connected with an inlet of a second mixing tank 11 through a second high tower elevator 10; the medium trace element supply part comprises a medium trace element storage tank 12, the medium trace element storage tank 12 is connected with a third high tower elevator 15 through a medium trace element crusher 13 and a third metering belt 14.

[0029] The essence of the utility model is that the compound fertilizer high tower granulation unit and the roller fluidized bed granulation unit are coupled to simultaneously produce two kinds of compound fertilizers with different formulas, for example, the compound fertilizer varieties with two different formulas, such as 15-15-15 (balanced fertilizer variety) and 35-5-5 (fertilizer variety for topdressing); the production process of the technical scheme of the utility model comprises raw material batching, high tower granulation, cooling and screening, coating, packaging, roller fluidized bed granulation, cooling, screening, coating, packaging, and tail gas washing and recovery processes. After the particles below the tower of the compound fertilizer high tower granulation unit are screened, about 5% of the particles with a particle size of more than 4.5 mm return to the high tower granulation system, 70% of the medium particles (with a particle size of 2.0-4.5 mm) enter the cooling, coating, and packaging system to form high tower compound fertilizer (such as formula 15-15-15); 25% of the small particles (with a particle size of less than 2.0 mm) enter the roller fluidized bed granulation unit, are coated by molten spraying with 96% molten urea (the urea molten liquid in the urea molten liquid pipeline 1 has a concentration of 99%, and the tail gas washing wastewater from the tail gas washing tower 29 can be mixed with the urea molten liquid in the urea molten liquid pipeline 1), are cooled and screened (with a particle size of 2.8-4.5 mm), are coated, and are packaged to form new high-nitrogen and large-particle compound fertilizer varieties (such as formula 35-5-5); the utility model can be used to produce two kinds of compound fertilizers with different varieties, and has the characteristics of low energy consumption and low cost.

[0030] The utility model discloses a production process of compound fertilizer, which comprises a high-tower granulation unit and a rotary fluidized bed granulation unit, and the high-tower granulation unit is used for producing balanced fertilizer with a formula of 15-15-15, and the rotary fluidized bed granulation unit is used for producing high-nitrogen fertilizer with a formula of 35-5-5.The utility model has reasonable process design, can be used to produce two different varieties of compound fertilizer, and has the characteristics of low energy consumption and low cost.

[0031] Test example

[0032] Taking a 200,000 tons / year compound fertilizer high tower granulation unit as an example, 25% of small particles, i.e. 50,000 tons / year, are recycled in the compound fertilizer high tower granulation unit to make qualified products, and the recycling cost is 50,000 tons x 200 yuan / ton = 10 million yuan / year, while the recycling cost of the drum fluidized bed granulation unit is 80 yuan / ton, and the energy-saving recycling cost is 50,000 tons x 120 yuan / ton = 6 million yuan / year.

[0033] Taking the output of the drum fluidized bed granulation unit as 30 t / h, the cost reduction brought by the drum fluidized bed production of high-nitrogen products is (30-7.5) x 7200 h x 120 yuan / ton = 1944 million yuan / year.

[0034] At the same time, the benefits generated are as follows: the compound fertilizer high tower granulation unit increases production due to the non-recycling of 25% of the returned material, and the output increase is not included.

[0035] In summary, the annual benefits of using the drum fluidized bed to produce high-nitrogen large-particle compound fertilizer in the device are more than 2544 million yuan.

[0036] The above shows and describes the basic principles, main features and advantages of the utility model. It should be understood by those skilled in the art that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the utility model, and various changes and improvements can be made without departing from the spirit and scope of the utility model. These changes and improvements all fall within the scope of the claimed utility model.

Claims

1. A system for simultaneous production of two different formula compound fertilizers, comprising a urea melt pipeline (1) and a compound fertilizer prilling unit, characterized in that: The compound fertilizer high-tower granulation unit comprises at least a granulation tower (17), an outlet of the granulation tower (17) is connected with an inlet of a first screening machine (18) for screening large-particle fertilizers, an outlet of qualified products of the first screening machine (18) is connected with an inlet of a second screening machine (19) for screening small-particle fertilizers, and a small-particle fertilizer outlet of the second screening machine (19) is connected with a rotary drum fluidized bed granulation unit. The urea melt liquid pipeline (1) is connected with the compound fertilizer high-tower granulation unit and the rotary drum fluidized bed granulation unit respectively.

2. The system for simultaneously producing two different compound fertilizers according to claim 1, characterized in that: The rotary drum fluidized bed granulation unit comprises a rotary drum fluidized bed granulator (20), a product outlet of the rotary drum fluidized bed granulator (20) is connected with a fluidized bed granulation packaging machine (25) in sequence through a small-particle screening machine (21), a large-particle screening machine (22), a fluidized bed granulation cooler (23) and a fluidized bed granulation coating machine (24).

3. The system for simultaneously producing two different compound fertilizers according to claim 2, characterized in that: The qualified product outlet of the second screening machine (19) is connected with a packaging machine (28) in sequence through a cooler (26) and a coating machine (27).

4. The system for simultaneously producing two different compound fertilizers according to claim 3, characterized in that: Tail gas outlets of the rotary drum fluidized bed granulator (20), the small-particle screening machine (21), the large-particle screening machine (22), the fluidized bed granulation cooler (23), the first screening machine (18), the second screening machine (19) and the cooler (26) are respectively connected with an inlet of a tail gas washing tower (29), and a liquid phase outlet of the tail gas washing tower (29) is connected with the urea melt liquid pipeline (1) entering the rotary drum fluidized bed granulator (20).

5. The system for simultaneously producing two different compound fertilizers according to claim 2, characterized in that: An inlet of the rotary drum fluidized bed granulator (20) is connected with the urea melt liquid pipeline (1), a small-particle fertilizer outlet of the second screening machine (19), a small-particle fertilizer outlet of the small-particle screening machine (21) and a large-particle fertilizer outlet of the large-particle screening machine (22). The large-particle fertilizer outlet of the large-particle screening machine (22) is connected with the inlet of the rotary drum fluidized bed granulator (20) through a crusher (30).

6. The system for simultaneously producing two different compound fertilizers according to claim 5, characterized in that: A fluidizing air inlet of the rotary drum fluidized bed granulator (20) is connected with an air pipeline (32) through a fluidizing air fan (31), and a cooling air inlet of the rotary drum fluidized bed granulator (20) is connected with the air pipeline (32) through a cooling air fan (33).

7. The system for simultaneously producing two different compound fertilizers according to claim 1, characterized in that: The compound fertilizer high-tower granulation unit further comprises a phosphorus element supply part, a potassium element supply part and a medium and trace element supply part; an inlet of a first mixing tank (6) in the phosphorus element supply part is connected with the urea melt liquid pipeline (1), an outlet of the first mixing tank (6) is connected with an inlet of a second mixing tank (11) in the potassium element supply part, an outlet of the second mixing tank (11) is connected with an inlet of the granulation tower (17) through a third mixing tank (16), and a third high-tower elevator (15) of the medium and trace element supply part is connected with the inlet of the second mixing tank (11).

8. The system for simultaneously producing two different compound fertilizers according to claim 7, characterized in that: The large-particle fertilizer outlet of the first screening machine (18) is connected with the inlet of the third high-tower elevator (15).

9. The system for simultaneously producing two different compound fertilizers according to claim 7, characterized in that: The phosphorus element supply part comprises a phosphorus element storage tank (2), the phosphorus element storage tank (2) is connected with the first metering belt (4) through a phosphorus element crusher (3), the first metering belt (4) is connected with the inlet of the first mixing tank (6) through the first high tower bucket elevator (5); The potassium element supply part comprises a potassium element storage tank (7), the potassium element storage tank (7) is connected with the second metering belt (9) through a potassium element crusher (8), the second metering belt (9) is connected with the inlet of the second mixing tank (11) through the second high tower bucket elevator (10); The medium trace element supply part comprises a medium trace element storage tank (12), the medium trace element storage tank (12) is connected with the third high tower bucket elevator (15) through a medium trace element crusher (13) and the third metering belt (14).

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