Compound fertilizer prilling tower with secondary air cooling and dust adsorption function

Abstract

The application discloses a compound fertilizer prilling tower with secondary air cooling and dust adsorption functions, which comprises a tower body, a spraying head for spraying compound fertilizer molten slurry is arranged at the top of the tower body, a primary cold air inlet is arranged at the bottom of the tower body, a plurality of secondary cold air inlets are uniformly arranged on the tower wall of the tower body and located at the lower end of a constant temperature area between the spraying head and the primary cold air inlet, and the air outlet directions of the plurality of secondary cold air inlets are arranged obliquely upward. Through the arrangement of the secondary cold air inlets, appropriate cold air can be added to the constant temperature area, the temperature difference of the molten body material can be accelerated, the crystallization and condensation efficiency of the molten body can be accelerated, the prilling effect is improved, and the surface of the material continues to crystallize, so that the dust volatilization is reduced. In addition, the falling material after secondary cooling has a lower temperature and higher particle strength when falling to the bottom of the tower, so that the material collection is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compound fertilizer prilling tower, more particularly to a compound fertilizer prilling tower with secondary air cooling and dust adsorption functions. BACKGROUND

[0002] The core device of the high tower compound fertilizer production process is a prilling tower body, and the principle is to use the characteristics that molten urea or ammonium nitrate can form low eutectic compounds with powdered ammonium phosphate, potassium chloride, potassium sulfate and the like, to generate a N, P, K nutrient eutectic mixture with good fluidity through metering and mixing, and to spray the nutrient eutectic mixture into the prilling tower body by using a special prilling machine, and to cool and crystallize the nutrient eutectic mixture into compound fertilizer particles with uniform nutrients through countercurrent air cooling.

[0003] The compound fertilizer molten slurry is discharged at about 130 degrees from the spray layer at the top of the tower (the top operating layer is 3-4 layers with a total height of about 18-21 m, and the lowermost layer is the spray layer), and the temperature decreases from high to low. In a certain area in the middle (30-50 m below the spray layer platform, about 20 m in height), the cooling air from the bottom of the tower exchanges heat with the molten liquid falling from the top of the tower, and the temperature is in a balanced state (see the shaded area in Figure 1 ). The heat exchange capacity becomes poor in the above range, which easily stops the crystallization process of the molten body. The molten liquid releases dust-containing gas to the air, which is not easily absorbed by the water washing device at the top of the tower and is discharged into the air. The discharged gas is difficult to meet the national emission standard, and is easily adhered to the tower wall in the tower body, and affects the prilling effect of the fertilizer.

[0004] Therefore, how to provide a compound fertilizer prilling tower with secondary air cooling and dust adsorption functions that can improve the prilling effect and reduce dust emission is a problem that those skilled in the art need to solve. SUMMARY

[0005] Therefore, the present application provides a compound fertilizer prilling tower with secondary air cooling and dust adsorption functions that can improve the prilling effect and reduce dust emission.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A compound fertilizer prilling tower with secondary air cooling and dust adsorption functions, comprising: a tower body, a spray head for spraying compound fertilizer molten slurry is arranged at the top of the tower body, a primary cold air inlet is arranged at the bottom of the tower body, a plurality of secondary cold air inlets are uniformly arranged on the tower wall of the tower body at the lower end height position of the constant temperature area between the spray head and the primary cold air inlet, and the air outlet directions of the plurality of secondary cold air inlets are arranged obliquely upward.

[0008] Compared with the prior art, the compound fertilizer prilling tower with secondary air cooling and dust adsorption function provided by the present application has the following beneficial effects. Figure 1 The secondary cooling inlet is arranged in the constant temperature area (the shadow part in the figure), and appropriate amount of cooling air is added to accelerate the temperature difference of the molten material and the crystallization condensation efficiency of the molten material, improve the prilling effect, and also reduce the dust volatilization by continuously crystallizing the material surface.

[0009] Further, each secondary cooling inlet on the tower body is connected to a plurality of cooling fans with a cold air electrostatic function through a pipeline.

[0010] The blowing operation of each secondary cooling inlet can be controlled separately, and the control is flexible.

[0011] Further, the tower wall of the tower body is internally provided with an annular air pipe in communication with the plurality of secondary cooling inlets.

[0012] The cooling fan sends the cooling air into the annular air pipe, and then the cooling air is blown out through the plurality of secondary cooling inlets.

[0013] Further, the spray angle of the spray head is 130°.

[0014] Further, the upward inclination angle of the secondary cooling inlet is 50-88°.

[0015] Further, the upward inclination angle of the secondary cooling inlet is 70°.

[0016] The above technical solution has the beneficial effect of ensuring that the material arc range sprayed by the spray head is within the range of the upward blowing of the secondary cooling inlet.

[0017] Further, the distance between the secondary cold air inlet and the spray head is 30-50 m. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description only represent some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the provided drawings.

[0019] Figure 1 The drawing is a front view structural schematic diagram of a compound fertilizer prilling tower with secondary air cooling and dust adsorption function.

[0020] Figure 2 The drawing is Figure 1 The structural enlarged schematic diagram of the local part A.

[0021] Figure 3 The drawing is Figure 1 The top view structural schematic diagram. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0023] Referring to Figures 1-3 The embodiments of the present application disclose a compound fertilizer prilling tower with secondary air cooling and dust adsorption function, comprising: a tower body 1, a spray head 2 for spraying compound fertilizer molten slurry is arranged at the top of the tower body 1, a primary cold air inlet 3 is arranged at the bottom of the tower body 1, a plurality of secondary cold air inlets 4 are uniformly arranged on the tower wall of the tower body 1 at the lower end height position of the constant temperature area between the spray head 2 and the primary cold air inlet 3, and the air outlet directions of the plurality of secondary cold air inlets 4 are arranged obliquely upward.

[0024] Each secondary cold air inlet 4 on the tower body 1 is connected to a plurality of cold air machines with the function of manufacturing cold air with static electricity through a pipeline.

[0025] The inside of the tower wall of the tower body 1 is provided with an annular air pipe in communication with the plurality of secondary cold air inlets 4, and the annular air pipe is in communication with the air outlets of the cold air machines with the function of manufacturing cold air with static electricity on the tower body 1.

[0026] The spray angle α of the spray head 2 is 130°.

[0027] The angle β of the upward inclination of the secondary cold air inlet 4 is 50-88°.

[0028] The angle of the outlet nozzle of the upward inclination of the secondary cold air inlet 4 is adjusted at β±(β / 2), for example, 70°.

[0029] The distance between the secondary cold air inlet 4 and the spray head 2 is 30-50 m.

[0030] The principle of the compound fertilizer prilling tower is as follows: the primary cold air inlet blows cold air upward, the material sprayed by the spray head is crystallized and solidified into compound fertilizer particles after the cold air, and in this process, the secondary cold air inlet also blows the appropriate amount of cold air with electrostatic function upward, which not only adds the appropriate amount of cold air to the constant temperature area (see the shaded part in Figure 1 ) in the tower body, accelerates the temperature difference of the molten material, and accelerates the efficiency of the crystallization and condensation of the molten material, improves the prilling effect, and also makes the surface of the material continue to crystallize and reduce dust evaporation; at the same time, the cold air with electrostatic function blown by the secondary cold air inlet blows upward, the aerosol dust evaporated is adsorbed into larger particles or falls down or is mostly adsorbed by the tower top water washing device before being discharged into the atmosphere outside the tower, greatly reducing the dust emission, so that the dust emission reaches the emission standard, in addition, the falling material after secondary cooling has lower temperature and higher particle strength when falling to the bottom, which is beneficial to material collection.

[0031] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the embodiments can be referred to each other. For the device disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0032] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A compound fertilizer prilling tower with secondary air cooling and dust adsorption function, characterized in that, The application relates to a compound fertilizer production tower, which comprises the following: a tower body (1) provided with a spraying head (2) for spraying compound fertilizer molten slurry at the top, a primary cold air inlet (3) at the bottom, a plurality of secondary cold air inlets (4) uniformly arranged on the tower body wall at the lower end of the constant temperature area between the spraying head (2) and the primary cold air inlet (3), and the air outlet directions of the secondary cold air inlets (4) are arranged obliquely upwards; each secondary cold air inlet (4) on the tower body (1) is connected to a plurality of cold air machines with a cold air static electricity function through pipelines; the inside of the tower wall of the tower body (1) is provided with an annular air pipe in communication with the plurality of secondary cold air inlets (4), and the annular air pipe is in communication with the air outlet of the cold air machine; the spraying angle alpha of the spraying head (2) is 130 degrees; the upward inclination angle beta of the secondary cold air inlet (4) is 50-88 degrees; the distance between the secondary cold air inlet (4) and the spraying head (2) is 30-50 m; the primary cold air inlet blows cold air upwards, the material sprayed by the spraying head is crystallized and solidified into compound fertilizer particles after being cooled by the cold air, and in the process, the secondary cold air inlet also blows in a proper amount of cold air with a static electricity function.

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