Drying device for preparing monoammonium phosphate from raffinate acid
By introducing a stirring and heating ventilation structure into the monoammonium phosphate drying equipment, the problems of uneven drying and moisture reflux in the existing equipment are solved, and uniform drying and cooling of monoammonium phosphate is achieved, and product quality is improved.
Patent Information
- Application Number
- CN202421160097.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The existing monoammonium phosphate drying equipment has a single structure, which leads to uneven drying and is prone to moisture reflux, affecting product quality.
A drying device including a stirring shaft, heating assembly and ventilation structure is designed. By combining a stirring blade and an electric heating plate, high-temperature air is injected for drying, and heated and vented with an air pump and a filter, combined with a spiral stirring blade. and pore structure to ensure uniform heating and rapid cooling of materials to avoid moisture reflux.
The uniform drying and rapid cooling of monoammonium phosphate is achieved, which avoids moisture reflux and improves the preparation quality and stability of the product.
Smart Images
Figure CN222279115U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of phosphoric acid preparation, in particular to a drying device used for preparing monoammonium phosphate by extracting raffinate. Background Art
[0002] Monoammonium phosphate is a white powder or granular substance (the granular product has a higher particle compressive strength). It can be classified according to its use into monoammonium phosphate for compound fertilizer, fire extinguishing agent, fermentation agent, nutritional enhancer, etc.
[0003] The existing production methods mostly use solvent extraction to purify wet phosphoric acid to produce purified phosphoric acid (industrial phosphoric acid or food phosphoric acid), which generally requires a dryer. For example, in the preparation process disclosed in the utility model with publication number CN202657964U, a drying equipment is required to dry the slurry separated by the centrifuge.
[0004] The commonly used drying equipment has a relatively simple structure. Not only does it lack a stirring structure, which leads to uneven drying, but also because the powdered monoammonium phosphate after drying is in a high temperature state, which is much higher than the external temperature, it is very easy to get damp after being discharged, resulting in agglomeration and affecting its use. Utility Model Content
[0005] Based on the above description, the utility model provides a drying device for preparing monoammonium phosphate from raffinate to solve the problems of single structure, uneven drying and easy moisture return of existing drying equipment.
[0006] The utility model is realized through the following technical solutions:
[0007] A drying device for preparing monoammonium phosphate by extracting residual acid, comprising a box body, a stirring shaft is vertically provided at the center of the box body, the stirring shaft is provided with stirring blades, a driving motor is provided at the top of the box body, the top end of the stirring shaft extends to the top surface of the box body and is transmission-connected to the driving motor, the lower half of the box body is in an inverted cone shape and a discharge port is provided at the center of the bottom surface, and a valve is provided on the discharge port; a heating component is also provided inside the box body, and a feed port and an exhaust pipe are respectively provided on both sides of the top of the box body.
[0008] On the basis of the above technical solution, the present invention can also be improved as follows.
[0009] Furthermore, the interior of the stirring shaft is configured to be hollow, and the top outer wall of the stirring shaft and the output end of the driving motor are provided with matching bevel gears. The inner wall of the port at the top of the stirring shaft is also provided with a ball bearing, and an air pipe is inserted into the ball bearing.
[0010] Furthermore, a plurality of auxiliary brackets are provided on the inner wall of the box body, and a bearing seat is provided at the center of each group of auxiliary brackets and is sleeved on the outer wall of the stirring shaft, and the ends of the auxiliary brackets extend toward the four sides and are fixedly connected to the inner wall of the box body.
[0011] Furthermore, the stirring blade is spiral-shaped and gradually becomes larger from the bottom to the top. The interior of the stirring blade is also hollow and connected to the interior of the stirring shaft. A plurality of air holes are also provided on the surface and side wall of the stirring blade.
[0012] Furthermore, the heating component includes an electric heating plate and an air pump, wherein the electric heating plates are arranged in multiple pieces and are tightly fitted to the inner wall of the box, and the wires of the electric heating plates extend outward to the outside of the box and are externally connected to a power source; the air pump is arranged on one side of the box and is provided with a heater at the connection between the top and the air pipe, and a filter is also provided on the air inlet of the air pump.
[0013] Furthermore, a plurality of temperature sensors are arranged on the inner side wall of the box, and a display screen is also provided on the side wall of the box and is electrically connected to the plurality of temperature sensors.
[0014] Furthermore, a heat-insulating layer is provided on the outer wall of the box body, and the heat-insulating layer is a glass wool board.
[0015] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:
[0016] 1. The present application is based on the improvement of the dryer in the existing phosphoric acid production and preparation process. By combining the stirring structure with the ventilation structure, high-temperature air can be injected during the stirring process, thereby expanding its drying range. The stirring blades are spiral-shaped, which can bring the material at the bottom to the bottom, thereby cooperating with the electric heating plate on the side wall of the box for comprehensive coverage. At the same time, the structure can also allow dry cold air to pass through, thereby quickly cooling the internal material, ensuring that the temperature of the material can be close to the external temperature during the subsequent discharging process, effectively avoiding the moisture reversion phenomenon during the subsequent packaging, and ensuring the preparation quality of monoammonium phosphate. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 Schematic diagram of the structure of the box in this embodiment;
[0018] Figure 2 Schematic diagram of the structure of the stirring shaft in this embodiment;
[0019] Figure 3 Schematic diagram of the structure of the temperature sensor in this embodiment;
[0020] Among them: 1. Box body; 11. Feed inlet; 12. Tail gas pipe; 2. Stirring shaft; 21. Stirring blade; 22. Gas pipe; 23. Auxiliary bracket; 3. Drive motor; 4. Heating component; 41. Electric heating plate; 42. Air pump; 43. Heater; 5. Display screen; 6. Temperature sensor. DETAILED DESCRIPTION
[0021] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.
[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.
[0023] Combination Figure 1-3 As shown, a drying device for preparing monoammonium phosphate from raffinate acid comprises:
[0024] The box body 1 is the external structure of the whole equipment, with a feed port 11 and an exhaust pipe 12 on the top, an inverted cone-shaped bottom, and a discharge port at the center of the bottom surface, and a valve on the discharge port;
[0025] The stirring shaft 2 is vertically arranged at the center of the box body 1, and a stirring blade 21 is arranged on the side wall thereof, and the top of the structure extends upward to the outside of the box body 1;
[0026] The driving motor 3 may be a SIMOT I CS motor of Siemens, which is arranged on the top of the box 1 and is drivingly connected to the stirring shaft 2;
[0027] The heating component 4 is arranged inside the box 1 and is used to heat and dry the internal slurry.
[0028] Specifically, in order to ensure that the stirring shaft 2 can rotate and stir stably, multiple groups of auxiliary brackets 23 should be arranged inside the box body 1. Each group of auxiliary brackets 23 consists of a bearing seat and four metal support rods. One end of the four metal support rods is fixedly connected to the inner wall of the box body 1, and the other end is fixedly connected to the side wall of the bearing seat. The upper and lower ends of the stirring shaft 2 inside the box body 1 are respectively inserted into the bearing seat, so that the driving motor 3 can drive the stirring shaft 2 to rotate stably inside the box body 1.
[0029] The stirring blade 21 is a spiral blade, and its pitch gradually increases from the bottom to the top. Figure 2 and Figure 3The figure is only a schematic diagram of its structure. Specifically, a spiral-shaped auger blade that gradually increases in size should be used to ensure that the material at the bottom can move upward with the stirring blade 21.
[0030] In addition, the interior of the stirring shaft 2 is set to be a hollow structure, and the stirring blade 21 is also set to be hollow, and the two are connected to each other. A ball bearing is provided on the inner wall of the port where the stirring shaft 2 extends to the top of the box body 1, and an air pipe 22 is inserted inside the ball bearing. The air pipe 22 is connected to the heating component 4, so that the stirring shaft 2 can receive the hot air injected by the air pipe 22 during the stirring process.
[0031] Bevel gears are arranged on the outer side wall of the top of the stirring shaft 2 and the output end of the driving motor 3, and are meshed with each other to form a transmission structure.
[0032] The side walls and surface of the stirring blade 21 are also provided with a plurality of air holes, and these air holes are used to discharge high-temperature air into the interior of the box 1, so as to achieve the purpose of rapid drying. After drying, the exhaust gas will be discharged along the exhaust pipe 12 at the top of the box 1 and collected and processed centrally.
[0033] In the above structure, the stirring blade 21 can not only achieve the effect of disturbing the internal slurry, but also use the pores to expand its coverage, thereby preventing a large amount of material accumulated in the center from being heated unevenly, greatly improving the uniformity of heating of the internal material.
[0034] The heating assembly 4 includes an electric heating plate 41 and an air pump 42, wherein the electric heating plate 41 uses a graphite electric heating plate of the LC-DB-EFS series, and is provided with multiple pieces and embedded on the inner wall of the box body 1, so that it is kept flush with the inner wall of the box body 1, so that it can cooperate with the above-mentioned stirring structure to further expand the coverage range, prevent the occurrence of drying dead corners, and accelerate the drying effect; the air pump 42 adopts one of the VFY series according to actual needs, is connected to the air supply pipe 22, and a heater 43 is provided at the top of the air pump 42 where it is connected to the air supply pipe 22, and the input air is heated by the heater 43, and a filter is provided at the air inlet of the air pump 42 to filter impurities in the incoming air to ensure the cleanliness of the air entering the box body 1.
[0035] At the same time, temperature sensors 6 (SIN-WZP lead-type thermal resistors can be used) should be installed at different heights and positions on the inner wall of the box 1 to monitor the temperature inside the box 1 and display it on a display screen 5 arranged on the surface of the box 1 to facilitate workers to adjust the temperature according to actual drying conditions.
[0036] Based on the above detection structure, in this embodiment, after ensuring that the drying is completed, the heater 43 on the air pump 42 (the heater can use an SRZ type air heater) can be deactivated, and cold air can be injected to slowly cool the interior so that the internal temperature approaches the external temperature. Therefore, when the material is discharged later, moisture resorption can be avoided, thereby ensuring the quality of the monoammonium phosphate produced.
[0037] In order to prevent the temperature from losing too quickly, a heat-insulating layer should be provided on the outer wall of the box body 1, that is, a glass wool board is used to cover the outer wall of the box body 1 to improve the heat-insulating effect.
[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the utility model.
Claims
1. A drying device for preparing monoammonium phosphate from raffinate acid, characterized in that: The invention comprises a box body (1), wherein a stirring shaft (2) is vertically arranged at the center of the box body (1), and a stirring blade (21) is arranged on the stirring shaft (2); a driving motor (3) is arranged at the top of the box body (1), and the top end of the stirring shaft (2) extends to the top surface of the box body (1) and is drivingly connected to the driving motor (3); the lower half of the box body (1) is in an inverted cone shape and a discharge port is arranged at the center of the bottom surface, and a valve is arranged on the discharge port; a heating component (4) is also arranged inside the box body (1), and a feed port (11) and an exhaust pipe (12) are respectively arranged on both sides of the top of the box body (1).
2. A drying device for preparing monoammonium phosphate from raffinate according to claim 1, characterized in that: The interior of the stirring shaft (2) is arranged to be hollow, and the outer wall at the top end of the stirring shaft (2) and the output end of the driving motor (3) are provided with matching bevel gears. The inner wall of the port at the top end of the stirring shaft (2) is also provided with a ball bearing, and an air pipe (22) is inserted into the ball bearing.
3. A drying device for preparing monoammonium phosphate from raffinate according to claim 1, characterized in that: A plurality of auxiliary brackets (23) are also provided on the inner wall of the box body (1), and a bearing seat is provided at the center of each group of auxiliary brackets (23) and is sleeved on the outer wall of the stirring shaft (2), and the ends of the auxiliary brackets (23) extend toward the four sides and are fixedly connected to the inner wall of the box body (1).
4. A drying device for preparing monoammonium phosphate from raffinate according to claim 2, characterized in that: The stirring blade (21) is spiral-shaped and gradually becomes larger from the bottom to the top. The interior of the stirring blade (21) is also arranged to be hollow and communicate with the interior of the stirring shaft (2). A plurality of air holes are also arranged on the surface and side wall of the stirring blade (21).
5. A drying device for preparing monoammonium phosphate from raffinate according to claim 4, characterized in that: The heating assembly (4) comprises a heating plate (41) and an air pump (42), wherein the heating plates (41) are arranged in a plurality and are closely attached to the inner wall of the box (1), and the wires of the heating plates (41) extend outward to the outside of the box (1) and are externally connected to a power source; the air pump (42) is arranged on one side of the box (1) and is provided with a heater (43) at the top where it is connected to the air supply pipe (22), and a filter is also provided on the air inlet of the air pump (42).
6. A drying device for preparing monoammonium phosphate from raffinate according to claim 1, characterized in that: A plurality of temperature sensors (6) are also arranged on the inner side wall of the box body (1), and a display screen (5) is also provided on the side wall of the box body (1) and is electrically connected to the plurality of temperature sensors (6).
7. A drying device for preparing monoammonium phosphate from raffinate according to claim 1, characterized in that: The outer side wall of the box body (1) is also provided with a heat-insulating layer, and the heat-insulating layer is a glass wool board.