Continuous crystallizer for producing macroelement water-soluble fertilizer

Abstract

The utility model discloses a continuous crystallizer for producing macroelement water-soluble fertilizer, which comprises a crystallizer upper cylinder, a crystallizer lower cylinder, a clear liquid feed port, a steam pump and a material passing pump, the crystallizer upper cylinder comprises an evaporation chamber, a condenser, a steam outlet, a cleaning port, a condensation pipeline and an inlet, and the crystallizer lower cylinder comprises a liquid discharge port and a crystal mush outlet. A steam circulating system formed by a steam pump, an inlet and a steam outlet is used for carrying out continuous flash evaporation on the clear liquid; an independent cooling circulation system formed by a steam pump, an inlet and a steam outlet is used for continuously cooling the clear liquid; a slurry circulating system formed by a liquid outlet, a material passing pump and an inlet is adopted to continuously feed residual liquid after crystallization into a continuous crystallizer for continuous crystallization; and clear liquid is fed into the continuous crystallizer through a clear liquid feeding hole for continuous crystallization. The continuous crystallization is realized, the functions of various systems are realized in the same equipment, the production cost is reduced, and the heat energy utilization rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of crystallizers, in particular to a continuous crystallizer for producing a large amount of element water-soluble fertilizer. Background Art

[0002] Crystallization is a crucial process in the chemical, pharmaceutical, fertilizer, and pesticide industries. Crystallizers are categorized into various types, including standard crystallization tanks, forced circulation, DTB, and OSLO, depending on the process route and functional structure. In the production of macronutrient water-soluble fertilizers, a clear liquid is pumped into the crystallizer, where a hot, saturated solution is adiabatically cooled and crystallized under vacuum. After the hot solution enters the crystallizer, it flashes, absorbing heat as the evaporated solvent cools, creating supersaturation and crystallization.

[0003] For example, a Chinese invention patent application with publication number CN220676816U, dated March 29, 2024, discloses a crystallizer circulating cooling system, which relates to the technical field of crystallization of calcium nitrate tetrahydrate. The circulating cooling system comprises a continuous crystallizer, a centrifuge, a feed pipe, and a discharge pipe. The continuous crystallizer comprises a plurality of crystallizer units, each of which is provided with a feed port, a discharge port, a water inlet, and a drain port. The water inlet of the preceding crystallizer unit is connected to the drain port of the succeeding crystallizer unit, and the drain port of the last crystallizer unit is connected to the drain port of the first crystallizer unit. The feed pipe is respectively connected to the feed ports of the plurality of crystallizer units. The centrifuge is respectively connected to the discharge ports of the plurality of crystallizer units via a discharge pipe. The beneficial effects of this utility model include improved production efficiency and reduced production costs.

[0004] It can be seen from the above patents that although efficiency is improved and cost is reduced, the overall system equipment is relatively large, and there are several crystallizer units. The crystallizer units are equipped with reactors, agitators, cooling coils, etc., and the structure inside the crystallizer units is relatively complex. Summary of the Invention

[0005] The purpose of the utility model is to solve the deficiencies of the prior art and to provide a continuous crystallizer for producing a large amount of water-soluble fertilizer.

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

[0007] A continuous crystallizer for producing a large amount of water-soluble fertilizer, comprising an upper crystallizer tube, a lower crystallizer tube, a clear liquid feed port, a feed valve, a steam pump, and a feed pump. The upper crystallizer tube comprises an evaporation chamber, a condenser, a steam outlet, a cleaning port, a condensation pipe, a water distributor, and an inlet. The lower crystallizer tube comprises a liquid discharge port, a slurry outlet, a temperature sensor, and an observation port.

[0008] The upper tube of the crystallizer is a long funnel-shaped cylinder. The funnel at the lower part of the upper tube of the crystallizer extends into the lower part of the lower tube of the crystallizer. The lower part of the upper tube of the crystallizer is connected to the top of the lower tube of the crystallizer. An evaporation chamber and a condenser are arranged inside the upper tube of the crystallizer. The evaporation chamber is arranged above the condenser. A steam outlet and a cleaning port are respectively arranged on the top and left side wall of the upper tube of the crystallizer; a drain port and a slurry outlet are respectively arranged on the upper part and bottom part of the lower tube of the crystallizer, and a feed pump is connected between the drain port and the inlet.

[0009] Preferably, the condensation pipe is arranged on the left side wall of the upper tube of the crystallizer, the condensation pipe is connected to the condenser, and the condenser and the condensation pipe are connected to other cooling systems; the inlet is arranged on the right side wall of the upper tube of the crystallizer and at the bottom of the evaporation chamber, a steam pump is connected between the inlet and the steam outlet, and the outside of the inlet is connected to a clear liquid feed port through a pipe.

[0010] Preferably, a water distributor is provided between the bottom of the inlet and the top of the condenser.

[0011] Preferably, the steam pump is arranged between the inlet and the clear liquid feed port.

[0012] Preferably, a feed valve is provided at the clear liquid feed inlet.

[0013] Preferably, a temperature sensor and an observation port are respectively provided at and below the drain port.

[0014] The beneficial effects of the utility model are:

[0015] 1. A steam circulation system consisting of a steam pump, an inlet and a steam outlet is used to continuously flash evaporate the clear liquid;

[0016] 2. An independent cooling circulation system formed by a steam pump, inlet and outlet is used to continuously cool the clear liquid;

[0017] 3. The slurry circulation system formed by the discharge port, feed pump and inlet is used to continuously feed the residual liquid after crystallization into the continuous crystallizer for continuous crystallization;

[0018] 4. Use the clear liquid feed port to add clear liquid into the continuous crystallizer for continuous crystallization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons skilled in the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0021] Figure 1 This is a schematic structural diagram of a continuous crystallizer for producing a large amount of water-soluble fertilizers proposed in the present invention;

[0022] Figure 1 Shown in: 1. Crystallizer upper tube, 2. Crystallizer lower tube, 3. Clear liquid feed port, 4. Steam pump, 5. Feed pump, 6. Evaporation chamber, 7. Condenser, 8. Steam outlet, 9. Cleaning port, 10. Condensation pipe, 11. Inlet, 12. Drain port, 13. Slurry outlet, 14. Water distributor, 15. Feed valve, 16. Temperature sensor, 17. Observation port. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] 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 rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] Reference Figure 1The utility model discloses a continuous crystallizer for producing a large amount of water-soluble fertilizer, including a crystallizer upper tube 1, a crystallizer lower tube 2, a clear liquid feed port 3, a feed valve 15, a steam pump 4 and a feed pump 5. The crystallizer upper tube 1 includes an evaporation chamber 6, a condenser 7, a steam outlet 8, a cleaning port 9, a condensation pipe 10, a water distributor 14 and an inlet 11. The crystallizer lower tube 2 includes a drain port 12, a slurry outlet 13, a temperature sensor 16 and an observation port 17.

[0026] The main body of the continuous crystallizer includes an upper crystallizer tube 1 and a lower crystallizer tube 2;

[0027] The upper tube 1 of the crystallizer is mainly used for flash evaporation and cooling of the clear liquid; the clear liquid feed port 3 is used to add clear liquid, and a feed valve 15 is provided at the clear liquid feed port 3 for opening the clear liquid feed port 3; the steam pump 4, the inlet 11 and the steam outlet 8 form a steam circulation system, which transports circulating steam to the evaporation chamber 6 of the upper tube 1 of the crystallizer, and the evaporation chamber 6 is used for flash evaporation of the clear liquid; the condenser 7 and the condensation pipe 10 are connected to other cooling systems to form an independent cooling circulation system, which cools the clear liquid flowing through the condenser 7; the cleaning port 9 provided on the left wall of the upper tube 1 of the crystallizer is used to clean the upper tube 1 of the crystallizer and the condenser 7;

[0028] The lower barrel 2 of the crystallizer is mainly used for graded crystallization of the clear liquid; the discharge port 12, the feed pump 5 and the inlet 11 form a slurry circulation system, the discharge port 12 is used to discharge the residual liquid after crystallization, and the crystal slurry outlet 13 is used to discharge the slurry containing crystals.

[0029] In an optional embodiment, a water distributor 14 is provided between the bottom of the inlet 11 and the top of the condenser 7. The water distributor 14 can evenly distribute the clear liquid flowing down from the inlet 11 in the cavity of the upper tube 1 of the crystallizer, thereby increasing the contact area between the clear liquid and the steam, accelerating the heat absorption and evaporation rate of the clear liquid, and thereby accelerating the subsequent crystallization rate.

[0030] In an optional embodiment, the steam pump 4 is arranged between the inlet 11 and the clear liquid feed port 3. When the clear liquid enters the pipeline through the clear liquid feed port 3 and flows toward the inlet 11, when it flows through the pipeline connecting the steam pump 4 and the inlet 11, it encounters the steam and begins to absorb the heat of the steam and be heated. Heat will not be wasted, and the thermal energy utilization rate is high.

[0031] In an optional embodiment, a temperature sensor 16 and an observation port 17 are provided at and below the liquid discharge port 12, respectively. The temperature sensor 16 is used to detect the temperature of the residual liquid in the lower barrel 2 of the crystallizer, ensuring that the temperature is always maintained near the crystallization temperature and remains stable. The preferred temperature is approximately 55°C. The observation port 17 is used to observe the liquid level in the lower barrel 2 of the crystallizer and the crystallization status.

[0032] The working process of this embodiment is as follows:

[0033] The steam pump 4 and the condensation pipe 10 are turned on to start the steam circulation system and the independent cooling circulation system. The clear liquid enters the pipeline from the clear liquid feed port 3 and flows toward the inlet 11. When it flows through the pipe connection between the steam pump 4 and the inlet 11, it begins to absorb the heat of the steam and is heated until it flows downward from the inlet 11 to the water distributor 14. It is evenly distributed and flows into the condenser 7, and is flash evaporated by the steam. After being cooled in the condenser 7, the clear liquid flows into the lower barrel 2 of the crystallizer, where supersaturation is generated and crystallization begins. As the supersaturated solution flows from bottom to top, the supersaturation gradually disappears, and the crystals gradually grow, achieving fractional crystallization. Large crystals descend and small crystals float. As a result, large crystals are preferentially extracted from the slurry outlet 13 and then filtered. Small crystals are retained and continue to grow. After reaching equilibrium, the remaining liquid is discharged through the drain port 12, flows into the feed pump 5, and re-enters the upper barrel 1 of the crystallizer from the inlet 11 to repeat the above steps, thus forming a continuous crystallization process. The clear liquid can also enter the clear liquid feed port 3 again and enter the upper tube 1 of the crystallizer together with the residual liquid for flash evaporation, cooling and crystallization.

[0034] Of course, the embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A continuous crystallizer for producing a large amount of water-soluble fertilizer, characterized by: The crystallizer comprises an upper barrel (1), a lower barrel (2), a clear liquid feed port (3), a steam pump (4) and a feed pump (5); the upper barrel (1) comprises an evaporation chamber (6), a condenser (7), a steam outlet (8), a cleaning port (9), a condensation pipe (10) and an inlet (11); and the lower barrel (2) comprises a liquid discharge port (12) and a slurry outlet (13); The upper cylinder (1) of the crystallizer is a long funnel-shaped cylinder. The funnel at the lower part of the upper cylinder (1) of the crystallizer extends into the lower part of the lower cylinder (2) of the crystallizer. The lower part of the upper cylinder (1) of the crystallizer is connected to the top of the lower cylinder (2) of the crystallizer. An evaporation chamber (6) and a condenser (7) are arranged inside the upper cylinder (1) of the crystallizer. The evaporation chamber (6) is arranged above the condenser (7). A steam outlet (8) and a cleaning port (9) are respectively arranged on the top and left side wall of the upper cylinder (1); a liquid discharge port (12) and a slurry outlet (13) are respectively arranged on the upper part and the bottom part of the lower cylinder (2). A feed pump (5) is connected between the liquid discharge port (12) and the inlet (11).

2. The continuous crystallizer for producing a large amount of water-soluble fertilizer according to claim 1, wherein: The condensation pipe (10) is arranged on the left side wall of the upper cylinder (1) of the crystallizer, the condensation pipe (10) is connected to the condenser (7), and the condenser (7) and the condensation pipe (10) are connected to other cooling systems; the inlet (11) is arranged on the right side wall of the upper cylinder (1) of the crystallizer and at the bottom of the evaporation chamber (6), a steam pump (4) is connected between the inlet (11) and the steam outlet (8), and the outside of the inlet (11) is connected to a clear liquid feed port (3) through a pipeline.

3. The continuous crystallizer for producing a large amount of water-soluble fertilizer according to claim 1, wherein: A water distributor (14) is provided between the bottom of the inlet (11) and the top of the condenser (7).

4. The continuous crystallizer for producing a large amount of water-soluble fertilizer according to claim 1, wherein: The steam pump (4) is arranged between the inlet (11) and the clear liquid feed port (3).

5. The continuous crystallizer for producing a large amount of water-soluble fertilizer according to claim 1, characterized in that: A feed valve (15) is provided at the clear liquid feed port (3).

6. The continuous crystallizer for producing a large amount of water-soluble fertilizer according to claim 1, characterized in that: A temperature sensor (16) and an observation port (17) are respectively provided at and below the liquid discharge port (12).

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