Large granular urea granulation system with pressure regulation function

Abstract

The utility model discloses a large granular urea granulation system with a pressure regulating function, which comprises a urea dissolving tank and a granulator which are connected through a process pipeline, and a urea melt pump, a second flowmeter, a pressure sensor, an electromagnetic valve and a urea booster pump are sequentially mounted on the pipeline between the urea dissolving tank and the granulator. The electromagnetic valve and the urea booster pump are arranged in parallel with the first flow meter; the pressure sensor and the electromagnetic valve are both connected with a computer; a filter screen is mounted at the bottom of an inner cavity of the urea dissolving tank, a heat exchange pipe is mounted above the filter screen, and a heat exchange jacket is arranged outside the urea dissolving tank. The large-particle urea granulation system provided by the utility model can solve the problems that the injection pressure of the urea spray head is reduced and the formed urea particles are small due to the change of the flow of molten urea, and also can solve the problem that the spray head is blocked due to insufficient melting of the urea.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of big particle urea prilling system with pressure regulating function, belong to urea prilling technical field. BACKGROUND

[0002] In the urea prilling process, the main role of the spray head (or nozzle) is to atomize the urea solution into fine droplets. These droplets contact and deposit on the surface of the suspended particles in the fluidized bed, thereby promoting the growth of the particles.

[0003] Large particle urea has low dust content, high compressive strength, and good flowability, making it suitable for bulk transportation and mechanized fertilization. However, agricultural fertilization is seasonal and demand is unstable, leading to unstable production load of large particle urea. This results in fluctuations in the operating load of the spray head of the prilling tower, changes in the flow of molten urea, and a decrease in the spray pressure of the urea spray head. This leads to smaller urea particles, lower product yield, and adhesion and caking of the tower wall.

[0004] In addition, during the spraying process of the urea solution through the spray head, blockage of the spray head may occur due to insufficient melting, affecting normal production progress.

[0005] As can be seen from the above, the prior art has obvious inconvenience and defects in actual use, and therefore needs to be improved. INVENTION CONTENTS

[0006] The utility model provides a kind of big particle urea prilling system with pressure regulating function for the deficiency in the background art, can solve the problem that urea particle is small due to the change of the flow of molten urea, the decrease of the spray pressure of the urea spray head, and also can solve the problem of blockage of the spray head due to insufficient melting of urea.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A kind of big particle urea prilling system with pressure regulating function, including urea dissolving tank and prilling machine connected by process pipeline, urea dissolving tank and prilling machine are sequentially installed with urea melting pump, second flowmeter, pressure receptor, solenoid valve and urea booster pump on the pipeline between them, solenoid valve and urea booster pump are in parallel with first flowmeter;Pressure receptor and solenoid valve are connected with computer;

[0009] The inner chamber bottom of the urea dissolving tank is installed with filter screen, heat exchange pipe is installed above the filter screen, and heat exchange jacket is arranged outside the urea dissolving tank.

[0010] Further, a prilling spray head is installed at the end of the pipeline between the urea dissolving tank and the prilling machine, and the prilling spray head is located in the prilling machine.

[0011] Further, the pressure sensor is composed of a pressure sensitive film, a nanomaterial wire and a wire for reading pressure signal.

[0012] Further, the urea dissolving tank is internally provided with a stirring mechanism, which is driven by a motor above the urea dissolving tank.

[0013] Further, the heat exchange pipes are distributed at the periphery of the stirring mechanism.

[0014] Further, the heat exchange jacket and the bottom side of the heat exchange pipes are connected with a heat exchange medium inlet pipe.

[0015] Further, the top side of the heat exchange jacket and the heat exchange pipes are connected with a heat exchange medium outlet pipe.

[0016] Further, the filter screen is arranged in a horizontal direction.

[0017] Compared with the prior art, the above technical scheme has the following advantages:

[0018] When the production load of the prilling system is reduced, the flow of the molten urea is changed, and the pressure of the molten urea pipeline is reduced; when the urea melting pressure is less than 0.2MPA, the system is adjusted: the pressure sensor transmits the detected pressure signal to the computer, the computer controls the electromagnetic valve to open, the molten urea enters the urea booster pump, and is boosted to 0.2-0.28MPA to meet the standard and then enters the prilling nozzle of the prilling machine, so that the problem of small urea particles caused by the low spraying pressure of the urea nozzle is solved.

[0019] The heat exchange jacket outside and the heat exchange pipe inside are matched to provide heat for the dissolution of urea, the heat exchange process is efficient, and under the action of the stirring mechanism, the urea can quickly reach the melting temperature and maintain the melting state, the molten urea is effectively filtered and then enters the prilling nozzle, so that the problem of clogging of the nozzle caused by insufficient melting of urea is solved.

[0020] The utility model will be described in detail below in combination with the drawings and examples. DRAWINGS

[0021] Figure 1 is the structural schematic diagram of the utility model;

[0022] Figure 2 is the internal structure schematic diagram of the urea dissolving tank.

[0023] In the figure, 1-motor, 2-urea dissolving tank, 3-urea melting pump, 4-urea booster pump, 5-pelletizer, 6-pelletizing nozzle, 7-computer, 8-first flow meter, 9-filter screen, 10-pressure receptor, 11-solenoid valve, 12-second flow meter, 13-heat exchange pipe, 14-heat exchange jacket, 15-heat exchange medium inlet pipe, 16-heat exchange medium outlet pipe. DETAILED DESCRIPTION

[0024] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described with reference to the accompanying drawings.

[0025] As shown in Figure 1 and Figure 2 The present application provides a large-particle urea pelletizing system with pressure regulating function, which comprises a urea dissolving tank 2 and a pelletizer 5 connected by a process pipeline, and a urea melting pump 3, a second flow meter 12, a pressure receptor 10, a solenoid valve 11 and a urea booster pump 4 are sequentially installed on the pipeline between the urea dissolving tank 2 and the pelletizer 5, and a pelletizing nozzle 6 is installed at the end of the pipeline, and the pelletizing nozzle 6 is located in the pelletizer 5.

[0026] The solenoid valve 11 and the urea booster pump 4 are arranged in parallel with the first flow meter 8.

[0027] The pressure receptor 10 and the solenoid valve 11 are both connected with the computer 7.

[0028] The pressure receptor 10 is composed of a pressure-sensitive film, a nanomaterial wire and a wire for reading pressure signals. The pressure receptor 10 transmits the detected pressure signals to the computer 1, and the computer 1 in turn controls the opening or closing of the solenoid valve 11.

[0029] A stirring mechanism is installed inside the urea dissolving tank 2, and the stirring mechanism is driven by the motor 1 above the urea dissolving tank 2.

[0030] A filter screen 9 arranged in a horizontal direction is installed at the bottom of the inner cavity of the urea dissolving tank 2, and the filter screen 9 is used to filter the molten urea to avoid the problem of clogging the nozzle 6 caused by the urea not fully dissolved entering the nozzle 6.

[0031] A heat exchange pipe 13 is installed above the filter screen 9, and the heat exchange pipe 13 is distributed around the stirring mechanism.

[0032] A heat exchange jacket 14 is arranged outside the urea dissolving tank 2, and the bottom side of the heat exchange jacket 14 and the heat exchange pipe 13 is connected with the heat exchange medium inlet pipe 15, and the top side of the heat exchange jacket 14 and the heat exchange pipe 13 is connected with the heat exchange medium outlet pipe 16.

[0033] The heat exchange process is efficient, and the urea can quickly reach the melting temperature and keep the melting state under the action of the stirring mechanism.

[0034] The specific working principle of the utility model is as follows:

[0035] When the production load of the granulation system is reduced, the flow of the molten urea changes, and the pressure of the molten urea pipeline is reduced. When the urea melting pressure is less than 0.2MPA, the system is adjusted: the pressure sensor 10 transmits the detected pressure signal to the computer 1, the computer 1 controls the electromagnetic valve 11 to open, the molten urea enters the urea booster pump 4, and is boosted to 0.2-0.28MPA to reach the standard, and then enters the granulation nozzle 6 of the granulator 5.

[0036] The utility model discloses a heat exchange jacket 14 outside cooperates with the heat exchange pipe 13 inside for the dissolution of urea and provides heat, and the heat exchange process is efficient, and under the action of the stirring mechanism, the urea can quickly reach the melting temperature and keep the melting state.

[0037] The above is the example of the best implementation mode of the utility model, wherein the part not described in detail is the common knowledge of the person skilled in the art. The protection scope of the utility model is subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. A large-particle urea prilling system with pressure regulation function, characterized by: The urea dissolving tank (2) and the granulator (5) are connected by a process pipeline, a urea melting pump (3), a second flow meter (12), a pressure sensor (10), an electromagnetic valve (11) and a urea booster pump (4) are sequentially installed on the pipeline between the urea dissolving tank (2) and the granulator (5), the electromagnetic valve (11) and the urea booster pump (4) are in parallel with the first flow meter (8); the pressure sensor (10) and the electromagnetic valve (11) are connected with a computer (7); The urea dissolving tank (2) is provided with a filter screen (9) at the bottom of the inner cavity, a heat exchange pipe (13) is installed above the filter screen (9), and a heat exchange jacket (14) is arranged outside the urea dissolving tank (2).

2. The prilling system for large granular urea with pressure regulation function according to claim 1, characterized in that: A granulation nozzle (6) is installed at the end of the pipeline between the urea dissolving tank (2) and the granulator (5), and the granulation nozzle (6) is located in the granulator (5).

3. The prilling system for large granular urea with pressure regulation function according to claim 1, characterized in that: The pressure sensor (10) is composed of a pressure sensitive film, a nanometer material wire and a wire for reading pressure signals.

4. The prilling system for large granular urea with pressure regulation function according to claim 1, characterized in that: A stirring mechanism is installed in the urea dissolving tank (2), and the stirring mechanism is driven by a motor (1) above the urea dissolving tank (2).

5. The prilling system for large granular urea with pressure regulation function according to claim 4, characterized in that: The heat exchange pipes (13) are distributed around the stirring mechanism.

6. The prilling system for large granular urea with pressure regulation function according to claim 1, characterized in that: The bottom side of the heat exchange jacket (14) and the heat exchange pipe (13) is connected with a heat exchange medium inlet pipe (15).

7. The prilling system for large granular urea with pressure regulation function according to claim 6, characterized in that: The top side of the heat exchange jacket (14) and the heat exchange pipe (13) is connected with a heat exchange medium outlet pipe (16).

8. The prilling system for large granular urea with pressure regulation function according to claim 1, characterized in that: The filter screen (9) is arranged in the horizontal direction.

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