Cooling device for crystallization in urea production

Abstract

The utility model belongs to the technical field of urea cooling crystallization, and particularly relates to a cooling device for urea production crystallization. A spiral pipe is installed in the limiting cylinder located on one side of the rotating motor to replace a transmission feeding mechanism, a cooling medium is applied through a side pipe arranged on the outer side of the limiting cylinder, and heat exchange is conducted between the cooling medium and urea through the spiral pipe, so that the pre-cooling treatment effect is achieved; an extending seat is arranged in the lower end area of the feeding pipe located at the upper end of the limiting cylinder, a conical filter plate for filtering the urea solution is arranged in the extending seat, and a storage seat for storing impurities is arranged on the outer side of the lower end of the extending seat. According to the utility model, impurities in the urea solution can be filtered in advance, the impurities are stored in a centralized manner to prevent blockage, meanwhile, the subsequent centralized cleaning and use are facilitated, and a pre-cooling treatment effect can be formed in the solution applying process, so that the crystallization uniformity of the urea solution is ensured, and the production quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of urea cooling crystallization, and particularly relates to a cooling device for urea production crystallization. Background Technique

[0002] The cooling crystallization during urea production is a physical process used to separate urea crystals from urea solution. In this process, the urea solution is gradually cooled, resulting in a decrease in the solubility of urea as the temperature drops. When the urea concentration in the solution exceeds its solubility at the current temperature, urea molecules will start to aggregate and precipitate crystals;

[0003] Currently, when the existing cooling crystallization equipment is in use, it often conducts heat exchange through the internal or external heat exchange mechanism of the equipment. At this time, the solution enters the equipment and directly contacts the low temperature, which will cause the cooling effect in the outer layer area to be obvious, while the inner layer part is not sufficiently cooled, resulting in uneven cooling crystallization effect of the solution and affecting the operation quality of cooling crystallization;

[0004] To solve the above problems, a cooling device for urea production crystallization is proposed in this application. Content of the Utility Model

[0005] The purpose of the utility model is to provide a cooling device for urea production crystallization, which solves the problems put forward in the above background technique.

[0006] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0007] The utility model is a cooling device for urea production crystallization, including: a reaction kettle; a limiting cylinder located on one side of a rotating motor, which forms a pre-cooling treatment effect by installing a feeding mechanism spiral tube inside and applying a cooling medium through a side tube located outside the limiting cylinder to conduct heat exchange with urea dissolution through the spiral tube; a feeding pipe located at the upper end of the limiting cylinder, with an extension seat provided in the lower end area thereof, a conical filter plate for filtering urea solution provided inside the extension seat, and a storage seat for storing impurities provided outside the lower end of the extension seat.

[0008] Further, both the upper and lower ends of the spiral tube are provided with adapters respectively docked to the lower end of the feeding pipe and the upper end of the reaction kettle.

[0009] Further, an upper support is provided at the upper end of the extension seat, and a rotating frame is rotatably installed inside it. A transmission gear is provided inside one side of the upper support and meshes with the upper part of the rotating frame.

[0010] Further, a connecting rod is provided at the lower end of the rotating frame, which is docked to the vicinity of the lower end of a push plate above the conical filter plate, and is used to drive its rotation to remove impurities on the surface of the conical filter plate.

[0011] Furthermore, a positioning groove for rotatably connecting the rotary frame is formed inside the lower end of the upper support.

[0012] Furthermore, both the conical filter plate and the push plate are installed in an inclined structure to facilitate the outward movement of the intercepted impurities.

[0013] Furthermore, the combination structure between the storage seat and the extension seat facilitates the centralized cleaning of the impurities stored in the storage seat.

[0014] The utility model has the following beneficial effects:

[0015] The utility model uses the cooperation of the limiting cylinder and the spiral tube to replace the traditional feeding mechanism, which can make the solution pre-contact with low temperature during feeding for pre-cooling treatment, so that the solution adapts to the cooling operation to ensure the subsequent cooling uniformity, thereby improving the operation quality of cooling crystallization during urea production, and at the same time improving the working efficiency and adapting to high-volume and high-efficiency production operations;

[0016] Through the cooperation of the feeding pipe and the limiting cylinder, the utility model can intercept the impurities in the solution by the conical filter plate when the solution enters, and then push them into the storage seat for storage under the shape of the push plate, so that the impurities are separated, so as to avoid the impurities in the solution adsorbing on the inner wall of the spiral tube and affecting the pre-cooling effect and the subsequent feeding effect, and at the same time improving the crystallization quality of the urea solution.

[0017] Of course, it is not necessary for any product implementing the utility model to achieve all the above advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic diagram of the overall external structure of the present utility model;

[0020] Figure 2 It is a schematic diagram of a partial internal structure of the limiting cylinder of the present utility model;

[0021] Figure 3 It is a schematic diagram of the connection part structure of the feeding pipe and the limiting cylinder of the present utility model;

[0022] Figure 4 It is a schematic diagram of a partial internal structure of the feeding pipe of the present utility model;

[0023] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0024] In the figure: 1, reaction kettle; 2, limit cylinder; 3, side pipe; 4, feed pipe; 5, spiral pipe; 6, adapter; 7, extension seat; 8, storage seat; 9, upper bracket; 10, conical filter plate; 11, rotating frame; 12, connecting rod; 13, push plate; 14, transmission gear; 15, positioning groove. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0027] Please refer to Figures 1-4 As shown, the present invention is a cooling device for urea production crystallization, including: reaction kettle 1; limit cylinder 2 on one side of the rotating motor, by installing a feeding mechanism spiral pipe 5 inside, and applying a cooling medium through the side pipe 3 provided outside the limit cylinder 2 to conduct heat exchange with the urea solution through the spiral pipe 5 to form a pre-cooling treatment effect;

[0028] Feed pipe 4 at the upper end of limit cylinder 2, with an extension seat 7 provided in the lower end area thereof, a conical filter plate 10 for filtering urea solution provided inside the extension seat 7, and a storage seat 8 for storing impurities provided outside the lower end of the extension seat 7;

[0029] This embodiment provides a urea crystallization cooling device that can pre-cool and filter the solution. By using the interception of the conical filter plate 10 in cooperation with the storage seat 8, impurities in the solution can be intercepted and stored in real time. Subsequently, when the solution is fed, heat exchange is formed through the contact between the spiral pipe 5 and the cooling medium, achieving a pre-cooling effect, enabling the solution to adapt to subsequent low-temperature operations, and improving the feeding and quality.

[0030] Among them, adapters 6 are provided at both the upper and lower ends of the spiral pipe 5 and are respectively connected to the lower end of the feed pipe 4 and the upper end of the reaction kettle 1 to transfer the flow path of the solution.

[0031] An upper bracket 9 is provided at the upper end of the extension seat 7, and a rotating frame 11 is rotatably installed inside the upper bracket 9. A transmission gear 14 is provided inside one side of the upper bracket 9 and is driven by a micro rotating motor, which engages with the upper part of the rotating frame 11 and drives it to rotate.

[0032] Among them, a connecting rod 12 is provided at the lower end of the rotating frame 11, which is connected to the push plate 13 above the conical filter plate 10 near the lower end area, and is used to drive it to rotate to remove impurities on the surface of the conical filter plate 10. The conical filter plate 10 and the push plate 13 are both inclined installation structures, so that impurities move to the outer circle to improve efficiency.

[0033] A positioning groove 15 is formed inside the lower end of the upper bracket 9 to which the rotating frame 11 is rotatably connected.

[0034] Among them, the storage seat 8 and the extension seat 7 are combined structures, which is convenient for centralized cleaning of impurities stored in the storage seat 8. After this arrangement, the storage seat 8 can be directly disassembled and the internal impurities can be cleaned after use.

[0035] It can be understood that the utility model can filter the impurities of the urea solution in advance and store the impurities in a centralized manner to prevent clogging, while facilitating subsequent centralized cleaning and use. Secondly, it can also form a pre-cooling treatment effect during the application of the solution to ensure the crystallization uniformity of the urea solution and improve production quality.

[0036] A specific application of the operation process of this embodiment is as follows: when in use, the applied urea solution is first intercepted by the conical filter plate 10, and then under the meshing action of the transmission gear 14 and the rotating frame 11, the power is transmitted through the connecting rod 12 to drive the push plate 13 to rotate, so as to push the impurities intercepted on the surface of the conical filter plate 10 and store them inside the storage seat 8, so as to form a centralized material for subsequent cleaning and use; further, the filtered urea solution enters the spiral tube 5 for spiral feeding, during which time it exchanges heat with the cooling medium inside the limiting cylinder 2 to form a pre-cooling treatment effect, so as to adapt to the subsequent low temperature, ensure the uniformity of the solution's cooling and crystallization, and improve the working efficiency of cooling and crystallization during urea production.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A cooling device for urea production crystallization, characterized in that: include: Reactor (1); The limiting cylinder (2) located at one side of the rotating motor has a feeding mechanism spiral tube (5) installed inside, and a cooling medium is applied by means of a side tube (3) arranged outside the limiting cylinder (2) to exchange heat with urea solution through the spiral tube (5), thereby forming a pre-cooling treatment effect; An inlet pipe (4) located at the upper end of the limiting cylinder (2) has an extension seat (7) at its lower end region, a conical filter plate (10) for filtering urea solution is provided inside the extension seat (7), and a storage seat (8) for storing impurities is provided outside the lower end of the extension seat (7).

2. A cooling device for urea production crystallization according to claim 1, characterized in that: The upper and lower ends of the spiral tube (5) are provided with adapters (6) which are respectively connected to the lower end of the feed pipe (4) and the upper end of the reaction kettle (1).

3. A cooling device for urea production crystallization according to claim 1, characterized in that: An upper bracket (9) is provided at the upper end of the extension seat (7), and a rotating frame (11) is rotatably mounted inside the upper bracket. A transmission gear (14) is provided inside one side of the upper bracket (9) and meshes with the upper part of the rotating frame (11).

4. A cooling device for urea production crystallization according to claim 3, characterized in that: The lower end of the rotating frame (11) is provided with a connecting rod (12) which is connected to the lower end region of the push plate (13) above the conical filter plate (10) and is used to drive the push plate (13) to rotate to remove impurities on the surface of the conical filter plate (10).

5. A cooling device for urea production crystallization according to claim 3, characterized in that: A positioning groove (15) for rotationally connecting the rotating frame (11) is provided inside the lower end of the upper bracket (9).

6. A cooling device for urea production crystallization according to claim 1, characterized in that: The conical filter plate (10) and the push plate (13) are both inclined installation structures, which are used to promote the outward movement of impurities after being intercepted.

7. A cooling device for urea production crystallization according to claim 1, characterized in that: The storage seat (8) and the extension seat (7) are in a combined structure, which facilitates centralized cleaning of impurities stored in the storage seat (8).

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