Potassium phosphate dibasic solution cooling crystallization apparatus and methods of use thereof

Abstract

The application discloses a potassium dihydrogen phosphate solution cooling crystallization device and a use method thereof, and belongs to the technical field of crystallization devices. The device comprises a cooling cavity, a cooling pipe arranged at the central bottom of the cooling cavity, two turning plates, a push rod, a power source and two connecting rods. The two turning plates are respectively arranged at the two sides of the cooling pipe and are hingedly connected with the inner bottom of the cooling cavity. The two sides of the two turning plates are sealingly matched with the inner side wall of the cooling cavity. The one end of the connecting rod is connected with the other end of the turning plate. The power source is fixedly connected with the outer wall of the cooling cavity and is drivingly connected with the other end of the push rod. The two connecting rods are symmetrically fixedly connected with the inner top of the cooling cavity. The triangular cooling cavity is hingedly connected with the free end of the connecting rod, so that the longest side of the triangular cooling cavity is adjacent to the turning plate. The feeding port is arranged in the central top region of the cooling cavity. The application has the beneficial effects of improving the cooling effect, shortening the cooling time and improving the quality of the generated potassium dihydrogen phosphate crystal.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of potassium dihydrogen phosphate preparation, and particularly relates to a potassium dihydrogen phosphate solution cooling crystallization device and a use method thereof. BACKGROUND

[0002] Potassium dihydrogen phosphate is widely used in modern chemical industry, medicine, food, agriculture, feed and other industries. In particular in agriculture, potassium dihydrogen phosphate is a high-efficiency compound fertilizer containing phosphorus and potassium. With the rapid development of efficient agriculture, water-saving agriculture and water-fertilizer integration in China, there is a broad market demand for water-soluble fertilizer, liquid fertilizer and the required raw material industrial-grade potassium dihydrogen phosphate. Potassium dihydrogen phosphate is generally produced by neutralization of hot-process phosphoric acid (or purified phosphoric acid) with potassium hydroxide. In the purification process of potassium dihydrogen phosphate, the granular finished product potassium dihydrogen phosphate is obtained after the steps of dissolution, cooling crystallization, centrifugal separation and drying.

[0003] The patent document with the Chinese patent publication number CN102910603A discloses a stirring method for cooling crystallization of potassium dihydrogen phosphate solution. The method can effectively improve the efficiency of cooling crystallization of potassium dihydrogen phosphate solution on the basis of ensuring the quality of crystallization. The method comprises the following steps: (1) passing 3-5℃ cooling water into the cooling pipe outside the cooling tank; (2) adding potassium dihydrogen phosphate solution into the cooling tank; (3) starting the stirring rod to stir the potassium dihydrogen phosphate solution in the cooling tank at a speed of 250-300 revolutions per minute; (4) when the potassium dihydrogen phosphate solution is added to the cooling tank to a height of 1 / 2-2 / 3 of the liquid level, passing 0-2℃ cooling water into the cooling pipe; (5) stirring the potassium dihydrogen phosphate solution in the cooling tank at a speed of 100-150 revolutions per minute until the potassium dihydrogen phosphate solution is fully crystallized after being filled in the cooling tank. In the patent, cooling is relied on the cooling pipe outside the cooling tank. The cooling effect of the cooling pipe is not good, and the heat transfer area between the cooling pipe and the potassium dihydrogen phosphate solution in the tank is limited, resulting in a long cooling time and uneven potassium dihydrogen phosphate crystals. SUMMARY

[0004] The technical problem to be solved by the present application is that the crystallization and cooling effect of potassium dihydrogen phosphate solution is not good, the cooling time is long, and the quality of potassium dihydrogen phosphate crystals is affected. Therefore, a potassium dihydrogen phosphate solution cooling crystallization device and a use method thereof are provided.

[0005] The present application is implemented as follows. A potassium dihydrogen phosphate solution cooling crystallization device comprises:

[0006] The cooling cavity is provided with a cooling pipe arranged in the center of the inner bottom of the cooling cavity, two flaps respectively arranged on the two sides of the cooling pipe and hinged to the inner bottom of the cooling cavity at one end, the two flaps being in sealing engagement with the inner side wall of the cooling cavity, a push rod connected to the other end of the flap, a power source fixed to the outer wall of the cooling cavity and in transmission connection with the other end of the push rod, two connecting rods symmetrically fixed to the inner top of the cooling cavity, a triangular cooling cavity hinged to the free end of the connecting rod at the center of the triangular cooling cavity, so that the longest side of the triangular cooling cavity is adjacent to the flap, and a feeding port arranged in the central area of the top of the cooling cavity.

[0007] Preferably, the longest side of the triangular cooling cavity is provided with a plurality of rib-shaped cavities protruding outward, and the corresponding position of the flap is provided with an open slot for the rib-shaped cavities to pass through.

[0008] Preferably, the longitudinal section of the triangular cooling cavity is an isosceles right triangle.

[0009] Preferably, the cooling pipe is arranged in an S shape in the center of the inner bottom of the cooling cavity.

[0010] Preferably, the top center of the cooling cavity is fixed with a connecting rod, and the connecting rod is connected with a servo motor through a detachable connecting mechanism.

[0011] Preferably, the top center of the cooling cavity is fixed with a connecting rod, and the connecting rod is connected with a servo motor through a detachable connecting mechanism.

[0012] Preferably, the detachable connecting mechanism comprises a connecting cone head fixedly installed on the output shaft of the servo motor, the bottom of the connecting cone head is provided with a connecting slot matched with the top end of the connecting rod, the outer circumferential surface of the connecting rod is provided with a plurality of lock slots, the inner wall of the connecting slot is provided with a plurality of through holes, the plurality of through holes are respectively arranged corresponding to the plurality of lock slots, a lock block is slidably installed in each of the plurality of through holes, the lock block is engaged with the corresponding lock slot, a plurality of U-shaped supports matched with the through holes are fixedly installed on the outer periphery of the connecting cone head, a spring two is fixedly installed between each of the plurality of lock blocks and the plurality of U-shaped supports, a sliding sleeve located above the U-shaped support is slidably sleeved on the outer periphery of the connecting cone head, a plurality of pull wires two corresponding to the U-shaped supports are fixedly installed on the sliding sleeve, and each of the plurality of pull wires two extends into the through hole from the closed end of the plurality of U-shaped supports and is fixedly connected with the corresponding lock block.

[0013] Preferably, the connecting rod outer sliding sleeve is provided with a sealing sleeve, the sealing sleeve is sealingly screwed with the connecting cone head and contains the U-shaped support and the sliding sleeve, a tapered hole is arranged in the area matched with the connecting rod of the sealing sleeve, and a sealing cone sleeve is fixedly arranged outside the sealing sleeve and sealingly fits the tapered hole.

[0014] Preferably, the inner bottom of the cooling cavity is centrally provided with a discharge port.

[0015] The use method of the potassium dihydrogen phosphate solution cooling crystallization device comprises the following steps: injecting the potassium dihydrogen phosphate solution into the cooling cavity from the feeding port; driving the push rod to move towards the side wall of the cooling cavity by the power source, so that the two flaps are opened outward, the potassium dihydrogen phosphate solution falls into the space between the two flaps and contacts the cooling pipe, and as the liquid level of the potassium dihydrogen phosphate solution rises, the longest side of the triangular cooling cavity contacts and rotates in the process that the flaps are opened outward, the longest side of the triangular cooling cavity is attached to the flaps, and the potassium dihydrogen phosphate solution away from the cooling pipe is cooled.

[0016] The potassium dihydrogen phosphate solution is directly contacted with the cooling pipe between the two flaps, when the liquid level of the potassium dihydrogen phosphate solution rises, the triangular cooling cavity contacts the upper part of the flaps to cool the potassium dihydrogen phosphate solution in the area, the uniform cooling of the potassium dihydrogen phosphate solution is ensured, the cooling effect is improved, the cooling time is shortened, and the quality of the generated potassium dihydrogen phosphate crystal is improved, meanwhile, the output shaft of the servo motor and the connecting rod are detachably connected in the scheme, so that the cooling cavity can be normally disassembled for maintenance, including normal loss such as related cleaning and overall replacement. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a sectional view of the potassium dihydrogen phosphate solution cooling crystallization device provided by the application;

[0018] Figure 2 is Figure 1 is an enlarged structural schematic view of part A shown in the figure;

[0019] Figure 3 is a front view structural schematic view of the connecting rod part in the application;

[0020] Figure 4 is a front view structural schematic view of the connecting cone head part in the application;

[0021] Figure 5 is a structural schematic view of the flap in the application;

[0022] Figure 6 is Figure 1 is a use state schematic view of the application;

[0023] Figure 7FIG. 2 is a sectional view of a preferred embodiment of the potassium dihydrogen phosphate solution cooling crystallization device of the present application;

[0024] Reference numeral: 1, connecting rod; 2, cooling cavity; 3, lower plate; 4, support plate; 5, servo motor; 6, cooling pipe; 7, triangular cooling cavity; 8, connecting cone; 9, connecting groove; 10, locking groove; 11, through hole; 12, locking block; 13, U-shaped support; 14, spring; 15, sliding sleeve; 16, pull wire; 17, sealing sleeve; 18, conical hole; 19, sealing cone sleeve; 20, discharge port, 21, rib-shaped cavity, 22, turning plate, 23, opening groove, 24, feed port, 25, push rod, 26, power source, 27, connecting rod. DETAILED DESCRIPTION

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting upon the application; the terms "comprising," "including," and "having," and variations thereof, as used in the specification and claims herein, are intended to be open-ended and to mean that the application includes, but is not limited to, the recited elements.

[0026] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment. It is explicitly contemplated that embodiments described herein can be combined with each other.

[0027] As Figures 1-5 shown, the present application provides a potassium dihydrogen phosphate solution cooling crystallization device, comprising:

[0028] Cooling cavity 2; cooling pipe 6, which is arranged in the center of the inner bottom of the cooling cavity; two flaps 22, which are respectively located on both sides of the cooling pipe and are hingedly connected to the inner bottom of the cooling cavity at one end, and the two sides of the two flaps are sealingly matched with the inner side wall of the cooling cavity; a push rod 25, which is connected to the other end of the flap through a connecting rod; a power source 26, which is fixedly connected to the outer wall of the cooling cavity and is drivingly connected to the other end of the push rod; two connecting rods 27, which are symmetrically fixedly connected to the inner top of the cooling cavity; a triangular cooling cavity 7, which is hingedly connected to the free end of the connecting rod, so that the longest side of the triangular cooling cavity is adjacent to the flap; a feed inlet 24, which is arranged in the central area of the top of the cooling cavity; the cooling cavity comprises an upper plate 2 fixedly installed at the bottom end of the connecting rod 1, a lower plate 3 arranged below the upper plate 2, two support plates 4 respectively fixedly installed on both sides of the upper plate 2, and the two support plates 4 are respectively buckled with both sides of the lower plate 3, the upper plate, the support plate and the lower plate form a rectangular cooling cavity, and the output shaft of the servo motor 5 is detachably connected to the top end of the connecting rod 1. The width of the triangular cooling cavity is smaller than the width of the cooling cavity, that is, there is enough gap between the triangular cooling cavity and the cooling cavity for the push rod to pass through. The push rod is a telescopic rod, and the power source can be a pneumatic cylinder or a hydraulic cylinder. The push rod can be one located on one side of the triangular cooling cavity, or two, which is more stable in operation, and is respectively located on both sides of the triangular cooling cavity. The triangular cooling cavity is filled with a cooling medium, and the longest side of the triangular cooling cavity exchanges heat with the potassium dihydrogen phosphate solution in the two flaps when it is in contact with the flaps.

[0029] As a preferred example of the present application, as shown in Figure 7 The longest side of the triangular cooling cavity protrudes outward with a plurality of rib-shaped cavities 21, and the corresponding position of the flap is provided with an opening slot 23 for the rib-shaped cavities to pass through. When the flap is turned over by the push rod to contact the triangular cooling cavity, the triangular cooling cavity is turned over to abut against the flap at the longest side, at which time the rib-shaped cavities can extend into the opening slot and contact the potassium dihydrogen phosphate solution in the space surrounded by the two flaps and the cooling cavity, thereby improving the cooling effect.

[0030] As shown in Figure 6Or 7, the method for using the potassium dihydrogen phosphate solution cooling crystallization device is shown, and the method comprises the following steps: injecting the potassium dihydrogen phosphate solution into the cooling cavity from the feeding port; driving the push rod to move towards the side wall of the cooling cavity by the power source, so that the two flaps are opened outward; the potassium dihydrogen phosphate solution falls into the space between the two flaps, and the space gradually increases as the flaps are opened; in this process, the potassium dihydrogen phosphate solution generates convection and turbulence, which promotes the uniform transmission of the heat of the potassium dihydrogen phosphate solution itself and the contact with the cooling pipe; as the liquid level of the potassium dihydrogen phosphate solution rises, the potassium dihydrogen phosphate solution will contact the longest side of the triangular cooling cavity and make it rotate in the process of the flaps being opened outward; and the longest side of the triangular cooling cavity is attached to the flaps, thereby providing cooling for the part of the potassium dihydrogen phosphate solution away from the cooling pipe.

[0031] In the above scheme, the servo motor 5 and the top end of the connecting rod 1 are connected by a detachable connection mechanism, which can reduce the erosion problem of the connection between the servo motor and the connecting rod during use. The detachable connection mechanism includes a connecting cone head 18 fixedly installed on the output shaft of the servo motor 5, a connecting groove 19 is formed in the bottom of the connecting cone head 18, which is matched with the top end of the connecting rod 1, a plurality of lock grooves 20 are formed on the outer periphery of the connecting rod 1, a plurality of through holes 21 are formed on the inner wall of the connecting groove 19, and a plurality of lock blocks 22 are slidably installed in the plurality of through holes 21, respectively. The lock blocks 22 are engaged with the corresponding lock grooves 20. A plurality of U-shaped supports 23 are fixedly installed on the outer periphery of the connecting cone head 18, and the openings of the U-shaped supports 23 are matched with the through holes. A spring 24 is fixedly installed between the plurality of lock blocks 22 and the plurality of U-shaped supports 23. A sliding sleeve 25 is slidably sleeved on the outside of the connecting cone head 18 and located above the U-shaped supports. A plurality of pull wires 26 are fixedly installed on the sliding sleeve 25 and correspond to the U-shaped supports one by one. The plurality of pull wires 26 respectively extend into the through holes from the closed ends of the plurality of U-shaped supports 23 and are fixedly connected with the corresponding lock blocks 22.

[0032] In the above scheme, the connecting rod 1 is slidably sleeved with a sealing sleeve 27, the sealing sleeve 27 is sealingly and threadedly connected with the connecting cone head 18 and contains the U-shaped supports and the sliding sleeve, a tapered hole 28 is formed in the region matched with the connecting rod of the sealing sleeve 27, and a sealing cone sleeve 29 is fixedly sleeved on the outside of the sealing sleeve 27 and sealingly fits into the tapered hole 28.

[0033] In the embodiment, the servo motor 5 is used to drive the cooling cavity to rotate, the cooling pipe 6 is arranged in S shape, the output shaft of the servo motor 5 in the scheme can be operated and fixed and unlocked with the connecting rod 1 in use, the sealing sleeve 27 is unlocked, the sliding sleeve 25 is slid upward, the sliding sleeve 25 pulls the pull line 26, the movement of the locking block 22 is controlled, the unlocking is realized, the spring 24 is rebounded, the internal components are sealed by the sealing sleeve 27 in use, the erosion problem in use is reduced, the service life is prolonged, the tapered hole 28 and the sealing cone sleeve 29 are arranged, the sealing property of the sealing sleeve 27 is good after locking, meanwhile, the lower plate 3 in the scheme can be detachably connected.

[0034] In the further preferable embodiment of the application, the upper surface of the lower plate 3 is centrally provided with a discharge port 20.

[0035] The above embodiments are only used to illustrate the technical solutions of the application, and do not limit the protection scope of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the application. Although the application is described in detail with reference to the above embodiments, those of ordinary skill in the art can combine, add or subtract or make other adjustments to the features in the embodiments of the application without creative labor under the condition of no conflict, so as to obtain different other technical solutions which do not deviate from the concept of the application in essence, and these technical solutions also belong to the scope of protection of the application.

Claims

1. A potassium dihydrogen phosphate solution cooling and crystallization apparatus, characterized in that, include: The cooling chamber comprises: a cooling pipe located at the center of the bottom of the cooling chamber; two flaps located on either side of the cooling pipe, with one end hinged to the bottom of the cooling chamber, and both sides of the flaps sealing against the inner wall of the cooling chamber; a push rod connected at one end to the other end of the flap; a power source fixed to the outer wall of the cooling chamber and driven by the other end of the push rod; two connecting rods symmetrically fixed to the top of the cooling chamber; a triangular cooling chamber hinged at the center of the connecting rod, such that the longest side of the triangular cooling chamber is close to the flap; and a feed inlet located in the central area of ​​the top of the cooling chamber. During the outward opening of the flaps, the feed inlet contacts the longest side of the triangular cooling chamber, causing it to rotate. The longest side of the triangular cooling chamber rests against the flap, providing cooling to the portion of the potassium dihydrogen phosphate solution away from the cooling pipe.

2. The potassium dihydrogen phosphate solution cooling and crystallization apparatus as described in claim 1, characterized in that, The longest side of the triangular cooling cavity protrudes outward with several rib-shaped cavities, and the corresponding position of the flap has an opening slot for the rib-shaped cavities to pass through.

3. The potassium dihydrogen phosphate solution cooling and crystallization apparatus as described in claim 1 or 2, characterized in that, The longitudinal section of the triangular cooling cavity is an isosceles right triangle.

4. The potassium dihydrogen phosphate solution cooling and crystallization apparatus as described in claim 1, characterized in that, The cooling pipe is laid in an S-shape at the center of the bottom of the cooling cavity.

5. The potassium dihydrogen phosphate solution cooling and crystallization apparatus as described in claim 1, characterized in that, A connecting rod is fixed to the top center of the cooling cavity, and the connecting rod is connected to the servo motor through a detachable connecting mechanism.

6. The potassium dihydrogen phosphate solution cooling and crystallization apparatus as described in claim 5, characterized in that, The detachable connection mechanism includes a connecting cone fixedly mounted on the output shaft of the servo motor. The bottom of the connecting cone has a connecting groove that matches the top of the connecting rod. The outer circumferential surface of the connecting rod has multiple locking grooves. The inner wall of the connecting groove has multiple through holes, each corresponding to a locking groove. Locking blocks are slidably installed in each of the multiple through holes, and the locking blocks engage with their corresponding locking grooves. Multiple U-shaped brackets with openings that mate with the through holes are fixedly mounted on the outer circumference of the connecting cone. Springs are fixedly installed between the locking blocks and the U-shaped brackets. A sliding sleeve located above the U-shaped brackets is slidably fitted on the outer side of the connecting cone. Multiple pull wires corresponding to the U-shaped brackets are fixedly installed on the sliding sleeve. The pull wires extend from the closed ends of the U-shaped brackets into the through holes and are fixedly connected to the corresponding locking blocks.

7. The potassium dihydrogen phosphate solution cooling and crystallization apparatus as described in claim 6, characterized in that, The connecting rod is slidably fitted with a sealing sleeve. The sealing sleeve is threadedly connected to the connecting cone and accommodates the U-shaped bracket and the sliding sleeve. A tapered hole is provided in the area where the sealing sleeve mates with the connecting rod. A sealing cone sleeve is fixedly fitted outside the sealing sleeve, and the sealing cone sleeve is sealed and fitted into the tapered hole.

8. The potassium dihydrogen phosphate solution cooling and crystallization apparatus as described in claim 1, characterized in that, The cooling chamber has a discharge port at the center of its inner bottom.

9. The method of using the potassium dihydrogen phosphate solution cooling crystallization apparatus as described in any one of claims 1-8, characterized in that, The process includes the following steps: potassium dihydrogen phosphate solution is injected into the cooling chamber through the inlet. The power source drives the push rod to move towards the side wall of the cooling chamber, causing two flaps to open outward. The potassium dihydrogen phosphate solution falls into the space between the two flaps and comes into contact with the cooling pipe. As the liquid level of the potassium dihydrogen phosphate solution rises, it will come into contact with the longest side of the triangular cooling chamber and cause it to rotate as the flaps open outward. The longest side of the triangular cooling chamber rests against the flaps, providing cooling to the portion of the potassium dihydrogen phosphate solution away from the cooling pipe.

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