Double-pipe reactor for ammoniated compound fertilizer production

Abstract

The utility model discloses a kind of double-pipe reactors for ammoniation compound fertilizer production, including acid liquid pipe, ammonia pipe, baffle, reaction tube, fixed rod, guide vane, ammonia separator, distributor, liquid inlet, gas inlet and cooling water system.Spiral guide vane is set to extend the retention and reaction time of acid liquid in reaction tube;Through the fine distribution of ammonia gas of mesh hole ammonia separator, the contact area of ammonia gas and acid liquid is increased, the contact path and time of ammonia gas and acid liquid are extended, so that ammonia gas and acid liquid are uniformly and fully reacted in reaction tube.The application solves the problem of low gas-liquid reaction uniformity and mixing efficiency, and controls the reaction temperature through the cooling water system to avoid local overheating leading to nutrient decomposition.

Description

Technical Field

[0001] This utility model relates to the field of compound fertilizer technology, specifically a double-tube reactor for the production of ammoniated compound fertilizer. Background Technology

[0002] The dual-tube reactor was an early core piece of equipment in the ammoniation granulation process. It physically isolates the input of acid and ammonia and optimizes granulation by utilizing in-situ reaction heat.

[0003] For example, Chinese patent CN206635236U, published on November 14, 2017, discloses a granulation reaction system for producing diammonium phosphate. It includes two reaction systems: tube reactor A and tube reactor B. Tube reactor A includes a first ammonia pipeline, a first medium-pressure steam pipeline, a first mixed acid pipeline, and a first reflux pipeline. Tube reactor B includes a second ammonia pipeline, a second medium-pressure steam pipeline, a second mixed acid pipeline, and a second reflux pipeline. Both the first and second mixed acid pipelines are connected to a mixed acid tank, and the two mixed acid pipelines have identical structures. This granulation reaction system modifies existing equipment by adopting a dual-tube reactor, thereby increasing production capacity, ensuring product quality, and improving economic efficiency.

[0004] As can be seen from the above patents, although the dual-tube reactor improves production capacity and ensures quality, it suffers from problems such as low uniformity of gas-liquid reaction and low mixing efficiency. Therefore, this utility model provides a dual-tube reactor for ammoniation compound fertilizer production to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a dual-tube reactor for the production of ammoniated compound fertilizer.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A dual-tube reactor for the production of ammoniated compound fertilizer includes an acid liquid tube and an ammonia gas tube.

[0008] A partition is provided to prevent direct contact between the acid liquid and the ammonia gas. The partition is fixedly connected to the connection between the acid liquid pipe and the ammonia gas pipe.

[0009] A reaction tube is used for the instantaneous neutralization reaction between acid and ammonia gas, and the reaction tube is connected to the acid gas tube and the ammonia gas tube respectively.

[0010] A fixing rod is used to fix the guide vane and the ammonia separator. The fixing rod is fixed at the axis of the reaction tube and extends from the bottom center of the partition to the bottom center of the reaction tube.

[0011] A flow guide plate, which is used to guide acid through the reaction tube, is fixedly installed on the fixed rod and extends from the upper part of the fixed rod to the lower middle part of the fixed rod;

[0012] An ammonia separator is used to allow ammonia gas to penetrate the acid solution and form microbubbles. The ammonia separator is fixedly installed on a fixed rod in the reaction tube and extends from the top of the reaction tube to the lower middle part of the reaction tube.

[0013] Preferably, the acid pipe and the ammonia pipe are arranged in parallel side by side, and the acid pipe and the ammonia pipe have the same specifications.

[0014] Preferably, the guide vanes are spirally distributed and the radial outer ends of the guide vanes are attached to the inner wall of the reaction tube.

[0015] Preferably, the ammonia separator is densely covered with mesh holes, which are installed in a three-dimensional shape in the guide plate and cover the guide plate.

[0016] Preferably, a distributor is installed at the bottom of the reaction tube, and the distributor is movably connected to the bottom of the reaction tube.

[0017] Preferably, the acid pipe and the ammonia pipe are respectively provided with a liquid inlet and a gas inlet at the ends away from the reaction pipe.

[0018] Preferably, the outer circumference of the reaction tube is surrounded by a cooling water system, which includes a cooling water inlet, a cooling water outlet, and a cooling water circulation system.

[0019] The beneficial effects of this utility model are:

[0020] The spiral guide vanes extend the residence time and reaction time of the acid solution within the reaction tube; the mesh ammonia separator achieves refined ammonia distribution, increasing the contact area between ammonia and acid, and extending the contact path and time, ensuring uniform and thorough reaction between ammonia and acid within the reaction tube. This application solves the problems of low uniformity and mixing efficiency in gas-liquid reactions, while a cooling water system controls the reaction temperature to prevent localized overheating and nutrient decomposition. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0023] Figure 1 This is a top view of the structure of this utility model;

[0024] Figure 2 For the present utility model Figure 1 Schematic diagram of the cross-sectional structure at point a;

[0025] As shown in the figure:

[0026] 1. Acid pipe; 2. Ammonia pipe; 3. Baffle; 4. Reaction pipe; 5. Fixing rod; 6. Flow guide; 7. Ammonia separator; 8. Distributor; 9. Liquid inlet; 10. Gas inlet; 11. Cooling water system; 1101. Cooling water inlet; 1102. Cooling water outlet; 1103. Cooling water circulation system. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0030] It should be noted that similar labels and letters are likely to represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Reference Figure 1-2 The present invention discloses a double-tube reactor for the production of ammoniated compound fertilizer, comprising an acid liquid pipe 1, an ammonia gas pipe 2, a baffle plate 3, a reaction pipe 4, a fixing rod 5, a guide plate 6, an ammonia separator 7, a distributor 8, a liquid inlet 9, an air inlet 10, and a cooling water system 11.

[0034] Acid pipe 1 and ammonia pipe 2, arranged in parallel and of the same specifications, are used to transport pressurized (0.2-0.5 MPa) acid (such as phosphoric acid or mixed acid) and ammonia gas, respectively. The acid and ammonia gas enter acid pipe 1 and ammonia pipe 2 through liquid inlet 9 and gas inlet 10, respectively. A baffle 3, used to prevent direct contact between acid and ammonia gas, is fixedly connected to the connection between acid pipe 1 and ammonia pipe 2 to avoid pre-reaction of acid and ammonia gas. A reaction pipe 4, used for instantaneous neutralization reaction between acid and ammonia gas, is connected to acid pipe 1 and ammonia pipe 2, respectively. A fixing rod 5, used to fix guide vane 6 and ammonia separator 7, is fixed at the axis of reaction pipe 4 and extends from the bottom center of baffle 3 to the bottom center of reaction pipe 4. A spiral guide is used to guide acid through reaction pipe 4. The guide vane 6 is fixedly installed on the fixed rod 5 and extends from the upper part of the fixed rod 5 to the middle and lower part of the fixed rod 5 to prolong the contact path and time between the acid and ammonia. The ammonia separator 7, which is used to allow ammonia to penetrate the acid and form microbubbles, is fixedly installed on the fixed rod 5 in the reaction tube 4 and extends from the top of the reaction tube 4 to the middle and lower part of the reaction tube 4. The ammonia microbubbles generated on the ammonia separator 7 increase the contact area between ammonia and acid to promote the uniform and sufficient reaction of ammonia and acid. The bottom of the reaction tube 4 is movably connected to the distributor 8, which allows the fully reacted slurry to be evenly distributed and directly sprayed into the subsequent rotary drum granulator for granulation.

[0035] In an optional embodiment, the ammonia separator 7 is densely covered with mesh holes, which are installed in a three-dimensional shape in the guide plate 6 and cover the guide plate 6. The presence of the three-dimensional mesh holes is conducive to the ammonia gas penetrating the acid liquid to form more microbubbles. The presence of more microbubbles is conducive to increasing the contact area between the ammonia gas and the acid liquid, further promoting the uniform and sufficient reaction of the ammonia gas and the acid liquid, and improving the mixing efficiency.

[0036] In an optional embodiment, the outer circumference of the reaction tube 4 is surrounded by a cooling water system 11. The cooling water system 11 includes a cooling water inlet 1101, a cooling water outlet 1102, and a cooling water circulation system 1103. Cooling water flows out from the cooling water circulation system 1103 and enters the cooling water system 11 through the cooling water inlet 1101 to cool the reaction tube 4 and thus control the reaction temperature, avoiding local overheating that could lead to nutrient decomposition. Cooling water flows out of the cooling water outlet 1102 and enters the cooling water circulation system 1103 for heat exchange before continuing the above-mentioned circulation cooling.

[0037] The working principle and usage process of this utility model are as follows:

[0038] Pressurized (0.2-0.5 MPa) acid solution (such as phosphoric acid or mixed acid) and ammonia gas are introduced into acid solution pipe 1 and ammonia gas pipe 2 respectively through liquid inlet 9 and gas inlet 10. After being blocked by baffle 3, the acid solution (such as phosphoric acid or mixed acid) and ammonia gas enter reaction pipe 4. The acid solution is guided by spiral guide plate 6 to flow spirally in reaction pipe 4. Ammonia gas forms microbubbles through the three-dimensional mesh holes of ammonia separator 7 and undergoes instantaneous neutralization reaction with acid solution. Cooling water from cooling water system 11 flows out from cooling water circulation system 1103, passes through cooling water inlet 1101 and cooling water outlet 1102 in sequence to cool reaction pipe 4, and then flows back into cooling water circulation system 1103 to form a cycle. After fully reacting, the slurry is evenly distributed by distributor 8 and directly sprayed into subsequent rotary drum granulator for granulation.

[0039] Of course, the embodiments described in this specific implementation are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A dual-tube reactor for the production of ammoniated compound fertilizer, comprising an acid liquid pipe (1) and an ammonia gas pipe (2), A partition (3) is used to isolate acid liquid and ammonia gas from direct contact. The partition (3) is fixedly connected to the connection between the acid liquid pipe (1) and the ammonia gas pipe (2). The reaction tube (4) is used for the instantaneous neutralization reaction of acid and ammonia. The reaction tube (4) is connected to the acid tube (1) and the ammonia tube (2) respectively. A fixing rod (5) is used to fix the guide plate (6) and the ammonia separator (7). The fixing rod (5) is fixed at the axis of the reaction tube (4) and extends from the bottom center of the partition plate (3) to the bottom center of the reaction tube (4). A guide plate (6) is used to guide acid through the reaction tube (4). The guide plate (6) is fixedly installed on the fixing rod (5) and extends from the upper part of the fixing rod (5) to the lower middle part of the fixing rod (5). Ammonia separator (7) is used to allow ammonia gas to penetrate the acid liquid to form microbubbles. The ammonia separator (7) is fixedly installed on the fixing rod (5) in the reaction tube (4) and extends from the top of the reaction tube (4) to the middle and lower part of the reaction tube (4).

2. The double-tube reactor for ammoniation compound fertilizer production according to claim 1, characterized in that: The acid pipe (1) and the ammonia pipe (2) are arranged in parallel, and the acid pipe (1) and the ammonia pipe (2) have the same specifications.

3. The double-tube reactor for ammoniation compound fertilizer production according to claim 1, characterized in that: The guide vanes (6) are spirally distributed and the radial outer ends of the guide vanes (6) are attached to the inner wall of the reaction tube (4).

4. The double-tube reactor for ammoniation compound fertilizer production according to claim 1, characterized in that: The ammonia separator (7) is densely covered with mesh holes, which are installed in a three-dimensional shape in the guide plate (6) and cover the guide plate (6).

5. The double-tube reactor for ammoniation compound fertilizer production according to claim 1, characterized in that: A distributor (8) is installed at the bottom of the reaction tube (4), and the distributor (8) is movably connected to the bottom of the reaction tube (4).

6. The double-tube reactor for ammoniation compound fertilizer production according to claim 1, characterized in that: The acid pipe (1) and ammonia pipe (2) are respectively provided with a liquid inlet (9) and a gas inlet (10) at the ends away from the reaction pipe (4).

7. The double-tube reactor for ammoniation compound fertilizer production according to claim 1, characterized in that: The outer circumference of the reaction tube (4) is surrounded by a cooling water system (11), which includes a cooling water inlet (1101), a cooling water outlet (1102), and a cooling water circulation system (1103).

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