Salt collecting and recycling device for preparing agricultural potassium chloride from sintering fly ash
By designing the sand sinking mouth of the cyclone to be horn-shaped and a heating device is installed outside it, the blockage problem caused by adhesion after potassium chloride precipitation is solved, and the effect of reducing the frequency of blockage and improving production efficiency is achieved.
Patent Information
- Application Number
- CN202421783478.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-07-26
AI Technical Summary
When the potassium chloride solution enters the cyclone, due to the decrease in temperature, the potassium chloride precipitates and adheres to the inner wall of the sand sinking mouth of the cyclone, resulting in blockage and affecting production efficiency.
The sand sinking mouth is designed to be trumpet-shaped, and a heating device is installed outside it to promote the precipitation of potassium chloride through liquid CO2, and the heating device is used to increase the temperature of the inner wall of the sand sinking mouth, so that the precipitated potassium chloride is resoluble in the potassium chloride solution to avoid clogging.
It effectively reduces the adhesion of potassium chloride crystals on the inner wall of the sand sinking mouth, avoids the phenomenon of blockage of the sand sinking mouth, reduces the frequency of equipment maintenance, and improves production efficiency.
Smart Images
Figure CN222974896U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sintered ESP ash treatment equipment, and particularly relates to a salt collection and recovery device for preparing potassium chloride for agricultural use from sintered dedusted ash. Background Art
[0002] The salt collection and recovery device for preparing potassium chloride for agricultural use from sintered dedusted ash is usually installed at the key part of solid-liquid separation of the core equipment, triple-effect evaporator, for preparing potassium chloride for agricultural use, and undertakes the important working condition of separating solid salt particles from the solution in the effect body. In the preparation process of preparing potassium chloride for agricultural use from sintered dedusted ash, the potassium chloride enriched liquid output from the evaporator contains high-concentration (usually up to 30%) potassium chloride, and is usually sent to a hydrocyclone, a thickener and a centrifuge for dehydration in sequence to obtain solid potassium chloride.
[0003] However, when the potassium chloride solution enters the hydrocyclone, potassium chloride will precipitate due to the temperature reduction, and the precipitated potassium chloride adheres to the inner wall of the sand settling port of the hydrocyclone, which is easy to block the outlet, and the outlet of the hydrocyclone needs to be cleaned frequently, delaying production. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a salt collection and recovery device for preparing potassium chloride for agricultural use from sintered dedusted ash, so as to reduce the blockage degree of the sand settling port and improve the production efficiency.
[0005] The utility model adopts the following technical scheme: a salt collection and recovery device for preparing potassium chloride for agricultural use from sintered dedusted ash, including a hydrocyclone, and the feed inlet of the hydrocyclone is used for inputting potassium chloride enriched liquid;
[0006] The feed inlet is also connected to a liquid CO 2 storage tank through a conveying pipe;
[0007] The sand settling port of the hydrocyclone is connected to the inlet of a centrifuge;
[0008] The sand settling port is in a horn shape, and the lower opening of the sand settling port is larger than the upper opening of the sand settling port.
[0009] Furthermore, the longitudinal section of the sand settling port is trapezoidal.
[0010] Furthermore, the overflow port of the hydrocyclone is located at its top, and the overflow port is connected to a potassium chloride preparation system to recycle the lean liquid overflowing from the overflow port.
[0011] Furthermore, a heating device is arranged outside the sand settling port.
[0012] Furthermore, a sleeve is sleeved outside the sand settling port, a sealed cavity is formed between the sleeve and the sand settling port, and a heating device is arranged in the sealed cavity.
[0013] Furthermore, the heating device is circulating water or a heating wire.
[0014] The beneficial effects of the present utility model are as follows: by designing the sand settling port in a flared shape, the present utility model can reduce the adhesion amount of the precipitated potassium chloride crystals on the inner wall of the sand settling port, thereby avoiding the blockage phenomenon of the sand settling port, reducing the equipment maintenance frequency, and improving the production efficiency. Description of the Drawings
[0015] Figure 1 It is a schematic structural diagram of a salt collection and recovery device for preparing agricultural potassium chloride from sintering dedusting ash according to an embodiment of the present utility model.
[0016] Among them: 1. Hydrocyclone; 2. Feed inlet; 3. Overflow port; 4. Sand settling port; 5. Liquid CO 2 Storage tank; 6. Delivery pipe; 7. Control valve; 8. Centrifuge. Detailed Embodiments
[0017] The present utility model will be described in detail below in conjunction with the drawings and specific embodiments.
[0018] During the actual application of the hydrocyclone 1, due to the physical property of potassium chloride precipitation at low temperature, blockage often occurs inside the hydrocyclone 1, affecting the production efficiency, increasing the on-site equipment shutdown and maintenance costs, and restricting the production benefits.
[0019] The present utility model discloses a salt collection and recovery device for preparing agricultural potassium chloride from sintering dedusting ash. As Figure 1 shown, it includes a hydrocyclone 1. The feed inlet 2 of the hydrocyclone 1 is used to input the potassium chloride enriched liquid; the feed inlet 2 is also connected to the liquid CO 2 storage tank 5 through a delivery pipe 6; the sand settling port 4 of the hydrocyclone 1 is connected to the inlet of the centrifuge 8; the sand settling port 4 of the hydrocyclone 1 is in a flared shape, and the lower opening of the sand settling port 4 is larger than the upper opening of the sand settling port 4.
[0020] By designing the sand settling port in a flared shape, the present utility model can reduce the adhesion amount of the precipitated potassium chloride crystals on the inner wall of the sand settling port, thereby avoiding the blockage phenomenon of the sand settling port, reducing the equipment maintenance frequency, and improving the production efficiency.
[0021] As a specific implementation method, the longitudinal section of the sand settling port 4 of the hydrocyclone 1 is trapezoidal, so that the diameter of the discharge port of the sand settling port 4 can be enlarged, reducing the blockage probability of the sand settling port 4.
[0022] In this process, the overflow port 3 of the hydrocyclone 1 is located at its top, and the overflow port 3 is connected to the potassium chloride preparation system to recycle the lean liquid overflowing from the overflow port 3. Generally, the lean liquid can be transported to the starting stage of the whole process, that is, the stage of mixing the lean liquid with the sintering dedusting ash, thereby reducing the usage amount of external water sources.
[0023] Since the temperature of the potassium chloride enriched liquid output from the evaporator is relatively high, the temperature will drop to normal temperature after entering the hydrocyclone 1. The temperature drop will affect the solubility of the potassium chloride solution. As the temperature drops, the solubility becomes smaller and potassium chloride precipitates. In the present utility model, liquid carbon dioxide is also introduced into the potassium chloride enriched liquid through the delivery pipe 6, and the addition amount of the liquid carbon dioxide is adjusted through the regulating valve 7 installed on the delivery pipe 6, so as to further reduce the temperature of the potassium chloride enriched liquid and increase the precipitation rate of potassium chloride.
[0024] In addition, since the precipitation rate of potassium chloride increases greatly, it is easy for the precipitated potassium chloride to adhere to the inner wall of the sand settling port 4. Therefore, in the present utility model, a heating device is arranged outside the sand settling port 4 to increase the temperature of the inner wall of the sand settling port 4, so that the potassium chloride adhering to its inner wall is redissolved in a small amount of potassium chloride solution (this is because the solubility of the potassium chloride solution increases with the increase of temperature), thus avoiding the occurrence of blockage problems.
[0025] Specifically, a sleeve is sleeved outside the sand settling port 4, a closed cavity is formed between the sleeve and the sand settling port, and a heating device is arranged in the closed cavity. The heating device is circulating water or a heating wire, which can be specifically designed according to the actual production environment.
[0026] In the present utility model, through experimental measurement, potassium chloride in the potassium chloride enriched liquid output from the evaporator accounts for about 30%. After passing through the hydrocyclone of the present utility model, the precipitation rate of potassium chloride output from the hydrocyclone accounts for about 90% of the whole solution, greatly improving the potassium chloride collection efficiency.
[0027] In summary, the present utility model combines the actual on-site production process and modifies the hydrocyclone as follows: 1. Connect an external pipeline to the feed port to fill in liquid CO 2 , boosting the low-temperature precipitation efficiency of potassium chloride; 2. Change the sand settling port 4 into an inverted horn shape, so as to expand the outlet diameter of the sand settling port 4 and reduce the blockage phenomenon caused by the crystallization and precipitation of potassium chloride. The working efficiency of the modified hydrocyclone is significantly improved, and the "hydrocyclone + thickener + centrifuge" salt collection and recovery system before modification is reduced to "hydrocyclone + centrifuge". While improving the potassium chloride recovery efficiency, redundant equipment (i.e., the thickener) is eliminated, effectively reducing the production cost.
Claims
1. A salt collection and recovery device for preparing agricultural potassium chloride from sintered dust, characterized in that: It comprises a cyclone (1), wherein a feed port (2) of the cyclone (1) is used to input a potassium chloride enriched solution; The feed port (2) is also connected to a liquid CO2 storage tank (5) via a delivery pipe (6); The sand settling port (4) of the cyclone (1) is connected to the inlet of the centrifuge (8); The sand settling port (4) is trumpet-shaped, and the lower end opening of the sand settling port (4) is larger than the upper end opening of the sand settling port (4).
2. The salt collection and recovery device for preparing agricultural potassium chloride from sintered dust as claimed in claim 1, characterized in that: The sand settling port (4) has a trapezoidal longitudinal cross section.
3. The salt collection and recovery device for preparing agricultural potassium chloride from sintered dust ash as claimed in claim 2, characterized in that: The overflow port (3) of the cyclone (1) is located at the top thereof, and the overflow port (3) is connected to a potassium chloride preparation system so as to recycle the lean liquid overflowing from the overflow port (3).
4. A salt collection and recovery device for preparing agricultural potassium chloride from sintered dust as claimed in claim 3, characterized in that: A heating device is arranged outside the sand settling port (4).
5. The salt collection and recovery device for preparing agricultural potassium chloride from sintered dust as claimed in claim 4, characterized in that: The sand settling port (4) is sheathed with a sleeve on its exterior, a sealed cavity is formed between the sleeve and the sand settling port, and a heating device is arranged in the sealed cavity.
6. A salt collection and recovery device for preparing agricultural potassium chloride from sintered dust as claimed in claim 5, characterized in that: The heating device is circulating water or heating wire.