Tower bottom air inlet structure for melt method compound fertilizer granulation and granulation tower

What is AI technical title?
AI technical title is built by Patsnap AI team. It summarizes the technical point description of the patent document.
By adding multiple sets of air inlet windows and the second feed surface to the bottom air inlet structure, the problem of insufficient air cooling at the bottom of the tower is solved, rapid cooling and efficient output of composite fertilizer particles are achieved, and the height of the granulation tower and infrastructure investment are reduced.

CN222969766UActive Publication Date: 2025-06-13尹俊东

View PDF 0 Cites 0 Cited by

Patent Information

Application Number: CN202421616786.5
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-07-10
Publication Date: 2025-06-13
Estimated Expiration: 2034-07-10

AI Technical Summary

Technical Problem

During the granulation process of melt compound fertilizer, insufficient cold air volume at the bottom of the tower causes the composite fertilizer particles to be unable to fully cool down, resulting in "soft and soft", flattening or breaking, affecting the quality and yield of particles.

Method used

A bottom air inlet structure is designed, including multiple sets of air inlet windows and a second feed surface, increasing the area and number of cold air inlets, and forming a cooling channel to improve the cooling efficiency of particles.

Benefits of technology

By increasing the air inlet area and number, particles can be cooled quickly, and the temperature is reduced by about 10°C, which improves particle quality and yield, and reduces the height of the granulation tower, saving infrastructure investment.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN222969766U_ABST

Patent Text Reader

Abstract

The utility model provides a tower bottom air inlet structure for compound fertilizer granulation by a melt method. The upper end of a tower body is an open end; the first material receiving surface is arranged at the bottom of the inner cavity of the tower body, and a first material channel concentrically distributed with the tower body is arranged in the middle of the first material receiving surface; the second material receiving surface is located below the first material receiving surface, a certain gap is formed between the second material receiving surface and the first material receiving surface to form a cooling channel, no less than two groups of air inlet windows are formed in the tower body, and no less than one group of air inlet windows corresponding to the second material receiving surface is formed in the bottom of the tower body. The area of the tower wall below the first receiving surface is fully utilized, the area and the number of the air inlets are increased, and due to the adoption of the structure of additionally arranging the air inlets, the area of the additionally arranged air inlets can be fully utilized through the second stress receiving surface, so that compound fertilizer particles can be quickly cooled.

Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical fertilizer manufacturing, and particularly relates to a bottom air inlet structure for melt - method compound fertilizer granulation and a granulation tower. Background Technique

[0002] At present, in the process of producing compound fertilizer by melt - method high - tower granulation, the production process of granulation is as follows: solid powder - like raw materials are lifted to the tower, and then enter the melting equipment and mixing equipment respectively according to process requirements. After mixing various required raw materials into a uniform high - temperature slurry, it enters the granulator for granulation. The slurry is thrown out by the granulator and becomes round small particles that freely fall from a high altitude. When they meet the cold air rising from the bottom of the tower, they are cooled and then fall onto the receiving surface at the bottom of the tower to complete the granulation process; the particles after leaving the tower need to be further cooled to room temperature before the subsequent process production can be carried out.

[0003] Currently, the height of the existing granulation towers is basically between 110 and 120 meters (varying according to different regions in the north and south. In the south, due to high temperature and high humidity, it is not easy to cool, so the granulation tower is slightly higher; in the north, due to low humidity and dry air, it is easier to cool, so the granulation tower is slightly lower). The granulator is generally set at about 90 meters. The shape of the material curtain formed by the particles ejected from the granulator is an inverted bell - shaped. The cold air at the bottom of the tower enters the inside of the material curtain and fully contacts with the compound fertilizer particles, enabling the particles to rapidly cool down during the falling process.

[0004] During the process of the compound fertilizer particles freely falling from a high altitude, the amount of cold air required at the bottom of the tower is very important, which affects the quality and output of the compound fertilizer particles. If the amount of cold air is too small, the compound fertilizer particles will not be sufficiently cooled. Only the outer surface is cooled, while the inside will form a "soft core". When they fall onto the receiving surface, they will be flattened or even broken into unqualified products, resulting in a decline in the quality or a reduction in the output of the compound fertilizer particles.

[0005] Therefore, it is necessary to provide an improved technical solution to address the deficiencies of the above - mentioned existing technologies. Content of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies in the above - mentioned existing technologies. The utility model provides a bottom air inlet structure for melt - method compound fertilizer granulation and a granulation tower.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A bottom air inlet structure for melt - method compound fertilizer granulation, comprising:

[0009] A tower body, the upper end of the tower body is an open end;

[0010] The first material receiving surface is arranged at the bottom of the inner cavity of the tower body. A first material channel concentric with the tower body is provided in the middle of the first material receiving surface;

[0011] The second material receiving surface is located below the first material receiving surface and has a certain gap with the first material receiving surface to form a cooling channel. Two second material channels are provided on the second material receiving surface, and the two second material channels are symmetrically distributed about the center of the second material receiving surface;

[0012] The outer diameter of the second material receiving surface is greater than the inner diameter of the first material channel. There are no less than two groups of air inlet windows provided on the tower body, and no less than one group of air inlet windows corresponding to the second material receiving surface is provided at the bottom of the tower body.

[0013] Preferably, each group of air inlet windows includes a plurality of windows, and the plurality of windows are evenly distributed in the circumferential direction of the tower body.

[0014] Preferably, at least one guiding plate is provided in the window located above the second material receiving surface, and the lower end of the guiding plate inclines towards the center of the tower body.

[0015] Preferably, the tower body is a cast-in-place concrete structure, and the first material receiving surface is integrally cast with the tower body.

[0016] Preferably, a material receiving machine installation opening is provided in the middle of the second material receiving surface.

[0017] Preferably, the distance between the first material receiving surface and the second material receiving surface is 1 - 2 m.

[0018] A melt method compound fertilizer granulation tower is provided with the tower bottom air inlet structure as described in any one of the above.

[0019] Preferably, a cover plate is provided above the tower body. The cover plate is fixed to the upper end of the tower body through columns, and the upper surface of the cover plate is an arc surface or a hemispherical surface.

[0020] Preferably, a granulator is provided in the middle and upper part of the tower body.

[0021] Beneficial effects: Make full use of the space inside the tower below the first material receiving surface, increase the area and quantity of the air inlets. Due to the structure of increasing the air inlets, the increased air inlets can make full use of the area through the second stressed material receiving surface, enabling the compound fertilizer particles to be cooled quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. Among them:

[0023] Figure 1 This is a structural schematic diagram of a granulation tower in a specific embodiment provided by the present utility model;

[0024] Figure 2 This is a structural schematic diagram of a second material receiving surface in a specific embodiment provided by the present utility model.

[0025] In the figure: 1. Tower body; 2. Granulator; 3. Window; 4. Guide plate; 5. First material receiving surface; 6. Second material receiving surface; 7. First material channel; 8. Second material channel; 9. Installation opening of the material receiving machine. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present utility model.

[0027] In the description of the present utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model rather than requiring the present utility model to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present utility model. The terms "connected" and "connected" used in the present utility model should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] Next, the present utility model will be described in detail with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0029] In the air inlet structure at the bottom of the existing granulation tower, the receiving surface is a single layer, and the particles fall onto the receiving belt below through the channel opened on the receiving surface; the upper and lower parts of the receiving surface are separated except for the receiving channel, and the tower wall below the receiving surface is only provided with a small door opening for personnel inspection and a door opening for particle discharge, and the air below the receiving surface cannot enter the upper part of the receiving surface. Two layers of windows are provided on the wall of the granulation tower above the receiving surface, and each layer has about 10 windows evenly distributed along the tower wall. The air outside the tower enters the tower through the windows, most of which enters the inside of the material curtain, and a part of it flows out directly along the inner wall of the granulation tower without contacting the particles, so that the particles are exposed to less cold air, are not fully cooled, the temperature drops to a small extent, and the scrap rate is high. In this way, the height of the granulator 2 in the granulation tower needs to be set higher, which also increases the height of the granulation tower.

[0030] Aiming at the defects of the existing bottom air inlet structure of the granulation tower, the utility model designs a bottom air inlet structure and a granulation tower for melt-process compound fertilizer granulation, such as Figure 1-2 As shown, it includes a tower body 1, a first material receiving surface 5 and a second material receiving surface 6, wherein the tower body 1 is a columnar structure made of cast-in-place concrete, the upper end of the tower body 1 is an open end, so that cold air can enter from the window 3 below, and be discharged upward after cooling the internal compound fertilizer particles, the first material receiving surface 5 is arranged at the bottom of the inner cavity of the tower body 1, the first material receiving surface 5 is annular, and a first material channel 7 concentrically distributed with the tower body 1 is arranged in the middle thereof, the first material channel 7 is circular, the second material receiving surface 6 is located below the first material receiving surface 5, and there is a certain gap between the second material receiving surface 5 and the first material receiving surface 5 to form a cooling channel, the second material receiving surface 6 is a disc structure, and its outer diameter is larger than the inner diameter of the first material channel 7, and can be larger than the diameter of the first material channel 7 by 0.5-1m.

[0031] There are no less than two groups of air inlet windows 3 on the tower body 1, and no less than one group of air inlet windows 3 corresponding to the second receiving surface 6 is provided at the bottom of the tower body 1. Two second material channels 8 are provided on the second receiving surface 6, and the two second material channels are symmetrically distributed about the center of the second receiving surface; the structure of the air inlet of the tower wall below the receiving surface is increased, that is, several door openings of the same size as the windows above the receiving surface are added around the tower wall below the receiving surface, and the number is also the same. With the improvement of the air inlet structure, the particle temperature is about 10°C lower than that of the granulation tower with a single receiving surface, which improves the quality and output of the particle product, and also reduces the cooling load for the subsequent secondary cooling of the finished product, which can reduce the height of the granulation tower and save infrastructure investment. The structure of the air inlet of the tower wall below the receiving surface is increased, that is, several door openings of the same size as the windows above the receiving surface are added around the tower wall below the receiving surface, and the number is also the same.

[0032] In an alternative embodiment, each group of air inlet windows 3 includes a plurality of windows 3 that are evenly distributed circumferentially around the tower body 1, and the corresponding arc angle of each window 3 can be 30-45°.

[0033] At least one material guiding plate 4 is provided in the window 3 above the second material receiving surface 6. The material guiding plate 4 is a metal plate, and the lower end of the material guiding plate 4 inclines towards the center of the tower body 1, so as to make the particles bounce inwards and prevent the particles from being thrown out of the window 3.

[0034] In an alternative embodiment, the tower body 1 is a cast-in-place concrete structure, and the first material receiving surface 5 is integrally cast with the tower body 1. Further, a conical surface is provided on the first material receiving surface 5. The smaller end of the conical surface extends to the inner edge of the first material channel 7, and the outer side of the conical surface extends to the inner wall of the tower body 1. The conical surface can be made of rubber material, and a ring-shaped support frame is provided at the bottom to support on the first material receiving surface 5.

[0035] Buffer rubber columns are uniformly distributed on the upper surface of the conical surface. The diameter of the rubber columns is not greater than the diameter of the particles, and the length is 3-5 times the diameter of the particles. The distance between adjacent two rubber columns is 2-3 times the diameter of the particles. Thereby, the particles are buffered to avoid impact damage to the particles. A vibration motor is provided on the lower surface of the conical surface, so that the particles can quickly slide towards the middle.

[0036] A material collector installation opening 9 is provided in the middle of the second material receiving surface 6. By installing a material collector, the material can be quickly collected into the material channel and then discharged, which can improve the falling rate of the particles. Then, the particles can be transported through the lower window 3. For example, a spiral feeder or a conveyor belt is provided below the second material receiving surface 6 for particle transmission.

[0037] In an alternative embodiment, the distance between the first material receiving surface 5 and the second material receiving surface 6 is 1-2 m, preferably 2 m.

[0038] Based on the above air inlet mechanism, the present invention further provides a melt method compound fertilizer granulation tower, and the granulation tower is provided with any one of the above tower bottom air inlet structures.

[0039] A granulator 2 is provided in the upper middle part of the tower body 1. A cover plate is provided above the tower body 1. There is a certain distance between the cover plate and the upper end of the tower body 1. The cover plate is fixed to the upper end of the tower body 1 through columns. The upper surface of the cover plate is an arc surface or a hemispherical surface, so as to accelerate the air convection in the tower and improve the cooling efficiency.

[0040] In an alternative embodiment, a fan can be provided above the granulator 2 in the inner cavity of the tower body 1 to accelerate the convection efficiency.

[0041] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model are within the scope of protection of the pending claims of the present utility model.

Claims

1. A tower bottom air inlet structure for melt-process compound fertilizer granulation, characterized in that: include: A tower body, wherein the upper end of the tower body is an open end; A first material receiving surface, wherein the first material receiving surface is arranged at the bottom of the inner cavity of the tower body, and a first material channel is arranged in the middle of the first material receiving surface and is concentrically distributed with the tower body; A second material receiving surface, the second material receiving surface is located below the first material receiving surface and has a certain gap with the first material receiving surface to form a cooling channel, and two second material channels are arranged on the second material receiving surface, and the two second material channels are symmetrically distributed about the center of the second material receiving surface; The outer diameter of the second material receiving surface is greater than the inner diameter of the first material channel. At least two groups of air inlet windows are provided on the tower body, and at least one group of air inlet windows corresponding to the second material receiving surface is provided at the bottom of the tower body.

2. The tower bottom air inlet structure for melt-process compound fertilizer granulation according to claim 1 is characterized in that: Each group of air inlet windows includes a plurality of windows, and the plurality of windows are evenly distributed in the circumferential direction of the tower body.

3. The tower bottom air inlet structure for melt-process compound fertilizer granulation according to claim 2 is characterized in that: At least one material guide plate is arranged in the window above the second material receiving surface, and the lower end of the material guide plate is inclined toward the center of the tower body.

4. The tower bottom air inlet structure for melt-process compound fertilizer granulation according to claim 1 is characterized in that: The tower body is a cast-in-place concrete structure, and the first material receiving surface is cast integrally with the tower body.

5. The tower bottom air inlet structure for melt-process compound fertilizer granulation according to claim 1 is characterized in that: A material receiving machine installation opening is provided in the middle of the second material receiving surface.

6. The tower bottom air inlet structure for melt-process compound fertilizer granulation according to claim 1 is characterized in that: The distance between the first material receiving surface and the second material receiving surface is 1-2m.

7. A melt-process compound fertilizer granulation tower, characterized in that: The granulation tower is provided with a bottom air inlet structure as described in any one of claims 1-6.

8. The melt-process compound fertilizer granulation tower according to claim 7, characterized in that: A cover plate is arranged above the tower body, and the cover plate is fixed to the upper end of the tower body through a column, and the upper surface of the cover plate is an arc surface or a hemispherical surface.

9. The melt-process compound fertilizer granulation tower according to claim 7, characterized in that: A granulator is arranged in the upper middle part of the tower body.