High tower granulation scene simulation experiment system and method

Abstract

The invention relates to the technical field of chemical fertilizer production, and discloses a high tower granulation scenario simulation experiment system and method.The high tower granulation scenario simulation experiment system comprises a pulping unit and a granulation unit which are sequentially connected, the granulation unit comprises a granulator, the bottom end of the granulator is communicated with a cooling pond, and cooling liquid is stored in the cooling pond; the granulator is connected with the solid-liquid separator through the cooling pond to separate chemical fertilizer particles and cooling liquid, a cooling liquid outlet of the solid-liquid separator is connected with a cooling liquid inlet of the granulator through a circulating pipeline, and a cooling tower is arranged on the circulating pipeline; round particles manufactured by the pelletizer fall into the cooling pool and are rapidly cooled through heat exchange with the cooling liquid, the cooling liquid does not need to descend from high altitude for cooling, and compared with an air cooling mode, the cooling liquid and the particles are in direct contact for heat exchange, so that the cooling speed is increased; high tower granulation can be simulated, order formula testing is carried out through the system, energy consumption is reduced, raw materials are saved, the number of defective products is small, and the formula adjusting and debugging cost of high tower granulation is saved.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizer production, in particular to a high-tower granulation scenario simulation experimental system and method. Background Art

[0002] The fertilizer high tower granulation technology is one of the new technologies in the production process of compound fertilizers. For example, in the granulation of compound fertilizers, urea or ammonium nitrate phosphate is indirectly heated and melted by steam, and then stirred and mixed with phosphorus and potassium fertilizers to form a flowable slurry, which naturally overflows into the differential granulator, is sprayed into the air-cooled tower under the action of centrifugal force, and is cooled and crystallized into spherical particles in the countercurrent air, thereby producing compound fertilizer particles. In the production of compound fertilizer high-tower granulation, the production line is used for formula experiments, especially the physical and chemical properties of monoammonium phosphate in its raw materials, such as the PH, water content, purity, etc. of monoammonium phosphate are variable and unstable, which brings a series of problems to the product production process and equipment use, such as the wall hanging phenomenon of the steam coil of the dissolving tank and the mixing tank, the blockage of the conveying pipeline, etc.; because the order of high-tower granulation is generally around 1,000 tons, and the single test feed amount of this order formula is tested through the production line, at least 40 tons is required, the waste of raw materials is too serious, and the products produced during the test process have a large number of empty shells, insufficient hardness, uneven particle size and other problems, resulting in a large number of defective products.

[0003] The pain points of high tower granulation can be attributed to the following: first, the product order formula needs to be combined with production line testing, which results in serious waste of raw materials, high energy consumption and high testing costs; second, there is a lot of powder, hollow particles and defective products in the production process; in addition, during the early testing of high tower granulation, when the raw materials stick to the tower wall and bottom, cleaning becomes more troublesome. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a high-tower granulation scenario simulation experimental system and method, which can simulate high-tower granulation, so that order formula testing can be carried out through this system, thereby reducing energy consumption, saving raw materials, reducing the amount of defective products, and saving the cost of formula adjustment and debugging of high-tower granulation.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In the first aspect, a high-tower granulation scenario simulation experimental system includes a pulping unit and a granulation unit connected in sequence. The granulation unit includes a granulator, and the bottom end of the granulator is connected to a cooling pool. The cooling pool contains coolant. The granulator is connected to a solid-liquid separator through the cooling pool to separate fertilizer particles and coolant. The coolant outlet of the solid-liquid separator is connected to the coolant inlet of the granulator through a circulation pipeline. A cooling tower is provided on the circulation pipeline.

[0007] As a further implementation, a circulation pump is provided on the circulation pipeline, and the circulation pump is provided between the cooling tower and the granulator.

[0008] As a further implementation, the pulping unit includes a pulping machine, and a pulp output end of the pulping machine is connected to a granulator.

[0009] As a further implementation, a stirring mechanism is arranged inside the pulping machine, and the stirring mechanism comprises a stirring shaft, which is driven by a motor and has stirring blades.

[0010] As a further implementation method, a heating device is provided inside the pulping machine for heating the fertilizer raw materials so that the fertilizer raw materials are melted into slurry, and a temperature control element is provided to control the temperature of the slurry.

[0011] As a further implementation, the granulator comprises a granulator housing, the cooling pool is connected to the bottom of the granulator housing, a granulator head is arranged inside the granulator housing, and the granulating mechanism is located above the cooling pool.

[0012] As a further implementation method, a heater is provided in the granulator to ensure that the temperature of the slurry is stable after entering the granulator. The granulator head is installed on an electric three-axis motion slide to adjust the position and height of the granulator head to ensure the shaping time of the liquid beads produced by the granulator in the air.

[0013] As a further implementation method, the granulator head is equipped with a variable frequency speed regulating motor to control the rotation speed of the granulator head; by adjusting the internal temperature of the granulator, the position and rotation speed of the granulator head, the simulated high tower granulation is realized, and the slurry is made into round liquid beads and falls into the bottom cooling pool under the action of gravity.

[0014] As a further implementation, the cooling pool is funnel-shaped, with an opening at the bottom and connected to the solid-liquid separator through a conveying pipeline, and a valve is provided on the conveying pipeline near the opening of the cooling pool.

[0015] In a second aspect, a high tower granulation scenario simulation experimental method is provided, using any of the high tower granulation scenario simulation experimental systems described above, comprising the following steps:

[0016] The pulping unit heats the fertilizer raw materials so that they melt into slurry. The slurry enters the granulator for granulation. The slurry is made into round liquid beads and falls into the bottom cooling pool under the action of gravity. The round liquid beads cool and solidify into round solid particles. The temperature of the coolant rises, and the round solid particles and the coolant enter the solid-liquid separator for separation to obtain the finished granulation product. The coolant enters the cooling tower through the circulation pipeline for cooling and then returns to the cooling pool at the bottom of the granulator. During the process, the parameters of the granulator and the pulping machine are continuously adjusted to realize the granulation scenario simulation experiment.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The bottom of the granulator of the present invention is connected with a cooling pool, and coolant is stored in the cooling pool. The granulator is connected to a solid-liquid separator through the cooling pool to separate fertilizer particles and coolant. The coolant outlet of the solid-liquid separator is connected to the coolant inlet of the granulator through a circulation pipeline. The compound fertilizer particles are cooled in the form of coolant, and high-tower granulation can be simulated. The order formula test can be carried out through this system, which reduces energy consumption, saves raw materials, has a small amount of defective products, and saves the cost of formula adjustment and debugging of high-tower granulation.

[0019] 2. The coolant outlet of the solid-liquid separator of the present invention is connected to a cooling tower, a circulating pump and a granulator through a circulating pipeline. The separated coolant is cooled by the cooling tower and then returns to the cooling pool at the bottom of the granulator to facilitate cooling of the particles during the next cycle.

[0020] 3. The high-tower granulation scenario simulation experimental system of the present invention can test the matching of the granulation head speed and the head position by adjusting the position relationship of the granulation head and the rotation speed of the granulation head, and can test the relationship between the rotation speed or the head height and the granulation quality; this system can be used to test relevant formulas before high-tower granulation, which greatly saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 It is a structural schematic diagram of a high tower granulation scenario simulation experimental system in an embodiment of the present invention.

[0023] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0024] Among them: 1. pulping machine, 2. granulator, 3. heater, 4. solid-liquid separator, 5. cooling tower, 6. circulation pump; 11. stirring mechanism, 21. cooling tank. DETAILED DESCRIPTION

[0025] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0026] Embodiment 1

[0027] In a typical embodiment of the present invention, reference is made to Figure 1As shown, a high-tower granulation scenario simulation experimental system includes a pulping unit and a granulation unit connected in sequence. The granulation unit includes a granulator 2, the bottom of which is connected to a cooling pool 21, and the cooling pool 21 contains a coolant. The granulator 2 is connected to a solid-liquid separator 4 through the cooling pool 21 to separate fertilizer particles and coolant. The coolant outlet of the solid-liquid separator 4 is connected to the coolant inlet of the granulator 2 through a circulation pipeline, and a cooling tower 5 is provided on the circulation pipeline. Through the high-tower granulation scenario simulation experimental system, a granulation simulation experiment is realized, which can reduce energy consumption and solve the problem of raw material waste.

[0028] like Figure 1 As shown, the pulping unit is a pulping machine 1, the granulating unit is a granulating machine 2, the output end of the pulping machine 1 is connected to the granulating machine, a stirring mechanism 11 is arranged inside the pulping machine 1, and the stirring mechanism 11 comprises a stirring shaft, which is driven by a motor and has stirring blades.

[0029] It can be understood that a heating device is provided inside the pulping machine 1 for heating the fertilizer raw materials so that the fertilizer raw materials are melted into slurry. The stirring shaft is driven by the motor, and the stirring shaft drives the stirring blades to rotate, continuously stirring the fertilizer raw material slurry to make it evenly mixed. The heating device adopts an electric heating wire, which is energized by the electric heating wire to heat the air inside the pulping machine, thereby achieving the purpose of heating the raw materials.

[0030] A temperature control element is also provided inside the pulping machine 1 to control the slurry temperature. The temperature control element can be a temperature sensor for detecting the slurry temperature inside the pulping machine. The temperature sensor can feed back temperature information to the heating device. When the fertilizer raw material slurry temperature is higher than the set temperature, the heating device stops working.

[0031] By setting a temperature sensor, the slurry temperature can be controlled to prevent the slurry temperature from being too low or too high, thus ensuring the pulping effect.

[0032] The fertilizer raw material slurry prepared by the pulping machine 1 is sent to the granulator 2 for granulation. The granulator 2 is provided with a heater 3, which is used to ensure that the temperature of the slurry is stable after entering the granulator. Figure 1 As shown, the granulator includes a granulator housing, and a cooling pool is connected to the bottom of the granulator housing; a granulator head is arranged inside the granulator housing, and the granulator mechanism is located above the cooling pool. The granulator head is mounted on an electric three-axis motion slide, and the electric three-axis slide can be used to accurately adjust the position and height of the granulator head to ensure the shaping time of the liquid beads produced by the granulator 2 in the air, so that the liquid beads are round and smooth. By adjusting the different positions and heights of the granulator head, a granulation experiment test can be carried out to verify the matching of the distance and rotation speed between the granulator head and the cooling pool until the best head position is found.

[0033] The granulator head is equipped with a variable frequency speed regulating motor to control the granulator head speed, thereby controlling the granulation speed of the granulator, and the relationship between the granulation speed and the granulation quality can be tested. By adjusting the internal temperature of the granulator 2, the position and speed of the granulator head, a simulated high tower granulation experiment can be realized. After the slurry is made into round liquid beads, it falls into the bottom cooling pool under the action of gravity, cools and solidifies into round solid particles, and the temperature of the coolant rises.

[0034] like Figure 1 As shown, the cooling pool 21 is arranged at the bottom of the granulator 2 housing. The cooling pool 21 is funnel-shaped, with an opening at the bottom and connected to the solid-liquid separator 4 through a conveying pipe. The conveying pipe is provided with a valve near the opening of the cooling pool 21. The cooling pool 21 contains cooling liquid. The round particles produced by the granulator 2 fall into the cooling pool and are quickly cooled by heat exchange with the cooling liquid. There is no need to cool them by descending from a high altitude. Compared with the air cooling method, this embodiment uses direct contact between the cooling liquid and the particles for heat exchange, which increases the cooling speed. And there is no need to build a high tower, which reduces costs.

[0035] The valve on the conveying pipeline opens when the particles in the cooling pool 21 reach a set level, and the coolant and the cooled fertilizer particles enter the solid-liquid separator 4 together.

[0036] In the solid-liquid separator 4, solid particles and cooling liquid are separated, and the solid-liquid separator 4 outputs the granulation product through the particle outlet and connects to the circulation pipeline through the liquid outlet. The circulation pipeline is provided with a circulation pump 6, which is arranged between the cooling tower 5 and the granulator 2.

[0037] The coolant enters the cooling tower 5 through the circulation pipeline for cooling. Under the action of the circulation pump 6, the coolant returns to the coolant inlet of the granulator 2. The coolant entering the granulator 2 is collected in the cooling pool 21 below the granulator to facilitate the cooling of the fertilizer particles in the next cycle. It can be understood that the cooling tower is a prior art, as long as the cooling of the coolant can be achieved.

[0038] Embodiment 2

[0039] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a high tower granulation scenario simulation experimental method, using the high tower granulation scenario simulation experimental system described in Example 1, includes the following steps:

[0040] After being weighed, the fertilizer raw materials are fed into the pulping machine 1. The pulping machine 1 heats the fertilizer raw materials through a heating device so that the fertilizer raw materials are melted into slurry. The stirring mechanism 11 continuously stirs the fertilizer raw material slurry to make it evenly mixed, and a temperature control element is provided to control the slurry temperature to prevent the slurry temperature from being too low or too high, thereby ensuring the pulping effect.

[0041] After pulping is completed, the slurry is sent to the granulator 2 for granulation. After the slurry is made into round liquid beads, it falls into the bottom cooling pool 21 under the action of gravity. The round liquid beads are cooled and solidified into round solid particles. The temperature of the coolant rises. When the fertilizer particles in the cooling pool 21 reach the set number, the valve on the conveying pipeline opens, and the round solid particles and the coolant enter the solid-liquid separator 4 for separation to obtain the granulated product. The coolant enters the cooling tower through the circulation pipeline and the circulation pump for cooling and then returns to the cooling pool at the bottom of the granulator; the parameters of the granulator and the pulper are continuously adjusted during the process to realize the granulation scenario simulation experiment.

[0042] The large production line of high-tower granulation uses air as the cooling medium, which has slow cooling and tall equipment, and needs to cooperate with the production line for formula testing in the early stage, which is costly. The present embodiment uses coolant as the cooling medium, which has rapid cooling and small equipment, with very little raw material and energy consumption, and simulates the high-tower granulation in a scene-recreating manner, saving the cost of formula adjustment and debugging of high-tower granulation.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high tower granulation scenario simulation experimental system, characterized in that: It includes a pulping unit and a granulating unit which are connected in sequence. The granulating unit includes a granulator, the bottom end of which is connected to a cooling pool. The cooling pool contains coolant. The granulator is connected to a solid-liquid separator through the cooling pool to separate fertilizer particles and coolant. The coolant outlet of the solid-liquid separator is connected to the coolant inlet of the granulator through a circulation pipeline. A cooling tower is provided on the circulation pipeline.

2. A high tower granulation scenario simulation experimental system according to claim 1, characterized in that: A circulation pump is arranged on the circulation pipeline, and the circulation pump is arranged between the cooling tower and the granulator.

3. A high tower granulation scenario simulation experimental system according to claim 1, characterized in that: The pulping unit comprises a pulping machine, and a pulp output end of the pulping machine is connected to a granulator.

4. A high tower granulation scenario simulation experimental system according to claim 3, characterized in that: A stirring mechanism is arranged inside the pulping machine, and the stirring mechanism comprises a stirring shaft, which is driven by a motor and is provided with stirring blades.

5. A high tower granulation scenario simulation experimental system according to claim 4, characterized in that: The pulping machine is provided with a heating device inside for heating the fertilizer raw materials so that the fertilizer raw materials are melted into slurry, and a temperature control element is provided to control the temperature of the slurry.

6. A high tower granulation scenario simulation experimental system according to claim 1, characterized in that: The granulator comprises a granulator housing, the cooling pool is connected to the bottom of the granulator housing, a granulator head is arranged inside the granulator housing, and a granulating mechanism is located above the cooling pool.

7. A high tower granulation scenario simulation experimental system according to claim 6, characterized in that: A heater is provided inside the granulator to ensure that the temperature of the slurry is stable after entering the granulator. The granulator head is installed on an electric three-axis motion slide to adjust the position and height of the granulator head.

8. A high tower granulation scenario simulation experimental system according to claim 7, characterized in that: The granulator head is equipped with a variable frequency speed regulating motor to control the rotation speed of the granulator head; by adjusting the internal temperature of the granulator, the position of the granulator head and the rotation speed, the simulated high tower granulation is realized, and the slurry is made into round liquid beads and then falls into the bottom cooling pool under the action of gravity.

9. The high tower granulation scenario simulation experimental system according to claim 1 is characterized in that: The cooling pool is funnel-shaped, with an opening at the bottom and connected to the solid-liquid separator through a conveying pipeline, and a valve is provided on the conveying pipeline near the opening of the cooling pool.

10. A high tower granulation scenario simulation experimental method, characterized in that: The high tower granulation scenario simulation experimental system as described in any one of claims 1 to 9 is adopted, comprising the following steps: The pulping unit heats the fertilizer raw materials so that they melt into slurry. The slurry enters the granulator for granulation. The slurry is made into round liquid beads and falls into the bottom cooling pool under the action of gravity. The round liquid beads cool and solidify into round solid particles. The temperature of the coolant rises, and the round solid particles and the coolant enter the solid-liquid separator for separation to obtain the finished granulation product. The coolant enters the cooling tower through the circulation pipeline for cooling and then returns to the cooling pool at the bottom of the granulator. During the process, the parameters of the granulator and the pulping machine are continuously adjusted to realize the granulation scenario simulation experiment.

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