Preparation system of sodium chloride crystal

Abstract

The invention relates to the technical field of sodium chloride crystal preparation systems, in particular to a sodium chloride crystal preparation system which comprises a crystal separation tank, an annular isolation cylinder 2, a first heat exchanger, a center cylinder and an annular isolation cylinder. The annular isolation barrel is provided with an upper guide section and a lower acceleration section which are sequentially connected, the upper end of the upper guide section is fixedly connected to the inner circumferential wall of the crystallization separation tank, the upper guide section is gradually and downwards inclined from outside to inside of the crystallization separation tank, and the lower acceleration section is located at the lower end of the upper guide section. Through circulating conveying of the first conveying pump and cooperation of the first conveying pump, the heating mechanism and the fine grain eliminating mechanism, circulating treatment of brine in the crystallization separation tank is achieved, the functions of particle size grading and particle size growth are achieved, the salt crystallization process is optimized, the proportion of the salt product with the size smaller than 450 micrometers is reduced to be within 18% from 45%, and the crystal breaking force is enhanced and is increased to 3.30-6.77 N from 1.39-6.61 N.

Description

Technical Field

[0001] The present invention relates to the technical field of sodium chloride crystal preparation systems, in particular to a sodium chloride crystal preparation system. Background Art

[0002] Salt particle size is one of the most important indicators for measuring salt. Its size and uniformity directly affect the quality, performance, salt variety regulation, and sales price of the product. Existing salt production equipment produces a large number of powder particles, which directly affects production and use. This has two main impacts. First, the large number of powder particles makes it easy for the particles to fly during use, which has a direct impact on the workload and health of operators, and also affects the cleanliness of the workshop. Excessive dust can even pose a safety hazard. Second, the salt particles are small and light. After the salt enters the salt tank, a large number of fine particles float on the top of the salt tank, making it difficult to settle. The brine concentration is uneven and difficult to control. The presence of a large number of fine particles can also clog pipelines, affecting production. In addition, the size of the crystal particles has a significant impact on agglomeration. The larger the proportion of small particles, the greater the contact area between the particles, and the greater the tendency to agglomerate, which affects the storage, transportation, and use of the salt. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problem that the existing preparation equipment produces a large number of powder particles and small salt particles, a preparation system for sodium chloride crystals is provided.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a preparation system of sodium chloride crystals, including a crystallization separation tank, an annular isolation cylinder, a first heat exchanger, a central cylinder and an annular isolation cylinder, the bottom of the crystallization separation tank is provided with salt legs that are interconnected, the annular isolation cylinder has an upper guide section and a lower acceleration section that are connected in sequence, the upper end of the upper guide section is fixedly connected to the inner circumferential wall of the crystallization separation tank, the upper guide section is gradually inclined downward from the outside to the inside of the crystallization separation tank, the lower acceleration section is located at the lower end of the upper guide section, a gap is provided between the lower acceleration section and the crystallization separation tank, and a clear liquid area with an opening downward is formed, one end of the central cylinder is located in the annular isolation cylinder, and the other end of the central cylinder protrudes from the upper end of the annular isolation cylinder, the crystallization separation tank is located in the annular isolation cylinder. A gushing zone is formed above the cylinder, the crystallization separation tank is located at the annular isolation cylinder to form a heating crystal growth zone, the crystallization separation tank is located below the annular isolation cylinder to form a particle separation zone, one end of the first heat exchanger is connected to the particle separation zone of the crystallization separation tank, the other end of the first heat exchanger is connected to the lower end of the central cylinder, a first delivery pump is provided between one end of the first heat exchanger and the crystallization separation tank, a fine crystal elimination mechanism is provided between the central cylinder and the crystallization separation tank, the fine crystal elimination mechanism is used to dissolve and eliminate the fine crystals floating in the clear liquid area and transport them to the central cylinder, a heating mechanism is provided between the central cylinder and the annular isolation cylinder, the heating mechanism is used to heat the brine in the gushing zone and the heating crystal growth zone and make the particles absorb heat to grow and crystallize, and promote the circulation of brine in the crystallization separation tank. Compared with the existing technology, this solution realizes the circulation treatment of the brine in the crystallization separation tank through the circulation of the first delivery pump and cooperates with the heating mechanism and the fine crystal elimination mechanism, and optimizes the salt crystallization process with the particle size classification and particle size growth functions, so that the proportion of salt products below 450μm is reduced from 45% to less than 18%. At the same time, the crystal crushing force is enhanced, increasing from 1.39~6.61N to 3.30~6.77N.

[0005] In order to implement the fine crystal elimination mechanism, some preferred embodiments include a fine crystal elimination dissolution tank, which is connected to the clear liquid area of ​​the crystallization separation tank via an external pipeline, the fine crystal elimination dissolution tank is connected to the raw material, and the fine crystal elimination dissolution tank is connected to the central cylinder via an external pipeline. A second delivery pump is provided on the external pipeline between the fine crystal elimination dissolution tank and the central cylinder. The dissolution of fine crystals is improved by heating external steam.

[0006] In order to better eliminate fine crystals, in some preferred embodiments, the fine crystal elimination and dissolution tank is provided with a stirring paddle, and the fine crystal elimination and dissolution tank is provided with a driving mechanism for driving the stirring paddle to rotate. The driving mechanism drives the stirring paddle to rotate to stir the fine crystals, thereby improving the dissolution efficiency of the fine crystals.

[0007] In some preferred embodiments, the outer peripheral surface of the fine crystal elimination and dissolution tank is provided with a heat-insulating spacer, and a gap is provided between the heat-insulating spacer and the outer peripheral surface of the fine crystal elimination and dissolution tank, and the gap is connected to the external hot steam.

[0008] In some preferred embodiments, a condensed water outlet is provided on the thermal insulation sleeve.

[0009] In some preferred embodiments, the fine crystal elimination and dissolution tanks are respectively provided with sewage outlets.

[0010] In order to realize the heating mechanism, some embodiments are preferred, wherein the heating mechanism includes a blower, a second heat exchanger and an annular gas distributor, wherein the annular gas distributor is arranged between the central tube and the annular isolation tube, and the annular gas distributor is a hollow structure, and the annular gas distributor is provided with a heating hole connected to its hollow structure, the output end of the blower is connected to one end of the second heat exchanger, and the other end of the second heat exchanger is connected to the hollow structure of the annular gas distributor.

[0011] In some preferred embodiments, a plurality of heating holes are evenly distributed on the annular gas distributor.

[0012] To facilitate cleaning of the crystallizer separation tank, in some preferred embodiments, the heating mechanism further includes an automatic flushing mechanism, the automatic flushing mechanism including an automatic flushing valve and an external flushing liquid, the annular gas distributor being connected to the output end of the automatic flushing valve, and the input end of the automatic flushing valve being connected to the external flushing liquid. By utilizing the existing annular gas distributor in communication with the external automatic flushing mechanism, during cleaning, the external cleaning liquid can be delivered to the annular gas distributor via the automatic flushing mechanism and sprayed through the heating holes to clean the interior of the crystallizer separation tank.

[0013] In some preferred embodiments, the upper end of the central tube has a flared end, and the flared end is in the shape of a trumpet that gradually opens from the inside to the outside.

[0014] The beneficial effects of the present invention are as follows: when in use, the preparation system of sodium chloride crystals of the present invention circulates and transports the brine in the crystallization separation tank through the first delivery pump and cooperates with the heating mechanism and the fine crystal elimination mechanism to realize the circulation treatment of the brine in the crystallization separation tank, and has the functions of particle size classification and particle size growth, thereby optimizing the salt crystallization process, so that the proportion of salt products below 450μm in the salt product is reduced from 45% to within 18%. At the same time, the crystal crushing force is enhanced from 1.39~6.61N to 3.30~6.77N, thereby avoiding the existing preparation equipment from producing a large number of salt product powder particles, which directly affects the production and use. There are mainly two aspects of influence: one is First, there are many powder particles, which are easy to fly during use, which has a direct impact on the workload and life and health of the operators, and will also affect the cleanliness of the workshop. There is even too much dust, which may pose a safety hazard. Second, the salt particles are small and light. After the salt enters the salt barrel, a large number of fine particles float on the upper part of the salt barrel, making it difficult to settle. The brine concentration is uneven and difficult to control. The presence of a large number of fine particles will also clog the pipeline and affect production. In addition, the size of the crystal particles has an important influence on agglomeration. The larger the proportion of small particles, the greater the contact area between the particles, and the tendency to agglomerate is greatly increased, thereby affecting the storage, transportation and use of salt. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and examples.

[0016] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 yes Figure 1 A partial enlarged view of middle A.

[0017] In the figure: 1. Crystallization separation tank, 2. Annular isolation cylinder 2, 3. First heat exchanger, 4. Center cylinder, 5. Salt leg, 6. Upper guide section, 7. Lower acceleration section, 8. Clear liquid area, 9. Spouting area, 10. Heating crystal growth area, 11. Particle separation area, 12. First delivery pump, 13. Fine crystal elimination and dissolution tank, 14. Second delivery pump, 15. Agitator, 16. Driving mechanism, 17. Insulation spacer, 18. Condensate outlet, 19. Sewage outlet, 20. Blower, 21. Second heat exchanger, 22. Annular gas distributor, 23. Heating hole, 24. Automatic flushing valve. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the embodiments: The present invention is not limited to the following specific embodiments. Based on the disclosure of the present invention, a person skilled in the art may adopt a variety of other specific embodiments to implement the present invention. Any simple changes or modifications made to the design structure and concept of the present invention fall within the scope of protection of the present invention. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other unless they conflict.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0021] like Figure 1-2As shown, a preparation system of sodium chloride crystals comprises a crystallization separation tank 1, an annular isolation cylinder 2, a first heat exchanger 3, a central cylinder 4 and the annular isolation cylinder 2. The top of the crystallization separation tank 1 is connected to an external vacuum pump, which extracts water vapor formed on the top of the crystallization separation tank 1. The bottom of the crystallization separation tank 1 is provided with salt legs 5 which are interconnected. Large-particle crystals sink to the salt legs 5. The salt legs 5 are connected to an external filtering centrifugal device. The annular isolation cylinder 2 has an upper guide section 6 and a lower acceleration section 7 which are connected in sequence. The upper end of the upper guide section 6 is fixedly connected to the inner circumferential wall of the crystallization separation tank 1. The upper guide section 6 is gradually inclined downward from the outside of the crystallization separation tank 1 to the inside. The lower acceleration section 7 is located at the lower end of the upper guide section 6. There is a gap between the lower acceleration section 7 and the crystallization separation tank 1 and forms a clear liquid area 8 with an opening downward. The clear liquid area 8 is a part of the fine crystal solution floating upward. One end of the central cylinder 4 is located in the annular isolation cylinder 2, and the other end of the central cylinder 4 protrudes from the annular isolation cylinder 2. The upper end of the center tube 4 has a flared end, and the flared end is in the shape of a trumpet that gradually opens from the inside to the outside. The crystallization separation tank 1 is located above the annular isolation tube 2 to form a gushing zone 9, and the crystallization separation tank 1 is located at the annular isolation tube 2 to form a heating crystal growth zone 10. The crystallization separation tank 1 is located below the annular isolation tube 2 to form a particle separation zone 11. One end of the first heat exchanger 3 is connected to the particle separation zone 11 of the crystallization separation tank 1, and the other end of the first heat exchanger 3 is connected to the lower end of the center tube 4. A first delivery pump 12 is provided between one end of the first heat exchanger 3 and the crystallization separation tank 1, and a fine crystal elimination mechanism is provided between the center tube 4 and the crystallization separation tank 1. The fine crystal elimination mechanism is used to dissolve and eliminate the fine crystals floating in the clear liquid area 8 and transport them to the center tube 4. A heating mechanism is provided between the center tube 4 and the annular isolation tube 2. The heating mechanism is used to heat the brine in the gushing zone 9 and the heating crystal growth zone 10 and make the particles absorb heat to grow and crystallize, and promote the circulation of brine in the crystallization separation tank 1.

[0022] The fine crystal elimination mechanism includes a fine crystal elimination dissolution tank 13, which is connected to the clear liquid area 8 of the crystallization separation tank 1 through an external pipeline, the fine crystal elimination dissolution tank 13 is connected to the raw material, and the fine crystal elimination dissolution tank 13 is connected to the central tube 4 through an external pipeline. A second delivery pump 14 is provided on the external pipeline between the fine crystal elimination dissolution tank 13 and the central tube 4, and a stirring paddle 15 is provided on the fine crystal elimination dissolution tank 13. The fine crystal elimination dissolution tank 13 is provided with a driving mechanism 16 for driving the stirring paddle 15 to rotate, and a sewage outlet 19 is provided on the fine crystal elimination dissolution tank 13.

[0023] The outer peripheral surface of the fine crystal elimination and dissolution tank 13 is provided with an insulation spacer 17 , and there is a gap between the insulation spacer 17 and the outer peripheral surface of the fine crystal elimination and dissolution tank 13 , and the gap is connected to the external hot steam. The insulation spacer 17 is provided with a condensed water outlet 18 .

[0024] The heating mechanism includes a blower 20, a second heat exchanger 21, an annular gas distributor 22 and an automatic flushing mechanism. The annular gas distributor 22 is arranged between the central tube 4 and the annular isolation tube 2. The annular gas distributor 22 is a hollow structure. The annular gas distributor 22 is provided with heating holes 23 connected to its hollow structure. The output end of the blower 20 is connected to one end of the second heat exchanger 21, and the other end of the second heat exchanger 21 is connected to the hollow structure of the annular gas distributor 22. Several heating holes 23 are evenly distributed on the annular gas distributor 22. The automatic flushing mechanism includes an automatic flushing valve 24 and an external flushing liquid. The annular gas distributor 22 is connected to the output end of the automatic flushing valve 24, and the input end of the automatic flushing valve 24 is connected to the external flushing liquid.

[0025] When the above-mentioned system for preparing sodium chloride crystals is used, the first delivery pump 12, the blower 20 and the second delivery pump 14 are started. The first delivery pump 12 delivers the brine in the clear liquid area 8 in the crystallization separation tank 1 to the first heat exchanger 3 for heating treatment. After heating, the brine is delivered to the central tube 4 and sprayed to the gushing area 9 and the heating crystal growth area 10 in the crystallization separation tank 1. After evaporation and crystallization, at the same time, the blower 20 drives the hot air heated by the second heat exchanger 21 upward through the annular gas distributor 22 to break the original gravity flow field, and causes small particles and large particles to flow from the heating crystal growth area 10 to the particle separation area 11 under the guidance of the annular isolation tube 2, wherein the large particles flow toward the salt leg 5, and a part of the small particles flow upward to the crystallization liquid surface. It continues to absorb heat and grow and crystallize, and another part of the fine crystals enters the clear liquid area 8 to realize the large and small particle separation area 11. The small particles in the clear liquid area 8 enter the fine crystal elimination dissolution tank 13 and are mixed with external raw materials and steam to melt. The unsaturated characteristics of the feed brine are used to dissolve the small particles. At the same time, steam is transported and the brine is heated in the gap between the fine crystal elimination dissolution tank 13 and the insulation spacer 17. The solubility of the sodium chloride solution increases with the increase of temperature, and eventually a large number of small particle crystals are dissolved, and heat energy is provided to the brine in the melting tank. The brine in the dissolution tank then enters the central tube 4 in the crystallization separation tank 1 through the second delivery pump 14 from the circulation pipe and is sprayed out and evaporated and crystallized to precipitate sodium chloride crystals; this cycle is repeated to eliminate fine particles in the product.

[0026] The above description of the preferred embodiments of the present invention is intended to serve as a guide. Based on the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A preparation system for sodium chloride crystals, characterized in that: It includes a crystallization separation tank, an annular isolation cylinder 2, a first heat exchanger, a center cylinder and an annular isolation cylinder, the bottom of the crystallization separation tank is provided with salt legs that are interconnected, the annular isolation cylinder has an upper guide section and a lower acceleration section that are connected in sequence, the upper end of the upper guide section is fixedly connected to the inner circumferential wall of the crystallization separation tank, the upper guide section is gradually tilted downward from the outside to the inside of the crystallization separation tank, the lower acceleration section is located at the lower end of the upper guide section, there is a gap between the lower acceleration section and the crystallization separation tank and a clear liquid area with an opening downward is formed, one end of the center cylinder is located in the annular isolation cylinder, the other end of the center cylinder protrudes from the upper end of the annular isolation cylinder, the crystallization separation tank is located above the annular isolation cylinder to form a gushing area, the crystallization separation tank A heating crystal growth zone is formed at the annular isolation cylinder, and the crystallization separation tank is located below the annular isolation cylinder to form a particle separation zone. One end of the first heat exchanger is connected to the particle separation zone of the crystallization separation tank, and the other end of the first heat exchanger is connected to the lower end of the central cylinder. A first delivery pump is provided between one end of the first heat exchanger and the crystallization separation tank, and a fine crystal elimination mechanism is provided between the central cylinder and the crystallization separation tank. The fine crystal elimination mechanism is used to dissolve and eliminate fine crystals floating in the clear liquid area and transport them to the central cylinder. A heating mechanism is provided between the central cylinder and the annular isolation cylinder, and the heating mechanism is used to heat the brine in the gushing zone and the heating crystal growth zone and allow the particles to absorb heat to grow and crystallize, and promote the circulation of brine in the crystallization separation tank.

2. a preparation system for sodium chloride crystals according to claim 1, characterized in that: The fine crystal elimination mechanism includes a fine crystal elimination dissolution tank, which is connected to the clear liquid area of ​​the crystallization separation tank through an external pipeline, the fine crystal elimination dissolution tank is connected to the raw material, and the fine crystal elimination dissolution tank is connected to the central tube through an external pipeline. A second delivery pump is provided on the external pipeline between the fine crystal elimination dissolution tank and the central tube.

3. a preparation system of sodium chloride crystals according to claim 2, is characterized in that: The fine crystal elimination and dissolution tank is provided with a stirring paddle, and the fine crystal elimination and dissolution tank is provided with a driving mechanism for driving the stirring paddle to rotate.

4. a preparation system for sodium chloride crystals according to claim 3, is characterized in that: The outer peripheral surface of the fine crystal elimination and dissolution tank is provided with a heat-insulating spacer, and a gap is provided between the heat-insulating spacer and the outer peripheral surface of the fine crystal elimination and dissolution tank, and the gap is connected to the external hot steam.

5. a preparation system for sodium chloride crystals according to claim 4, characterized in that: The thermal insulation sleeve is provided with a condensed water outlet.

6. according to the preparation system of a kind of sodium chloride crystal described in claim 2 or 3 or 4 or 5, it is characterized in that: The fine crystal elimination and dissolution tanks are respectively provided with sewage outlets.

7. a preparation system for sodium chloride crystals according to claim 1, characterized in that: The heating mechanism includes a blower, a second heat exchanger and an annular gas distributor. The annular gas distributor is arranged between the central tube and the annular isolation tube. The annular gas distributor is a hollow structure. The annular gas distributor is provided with a heating hole connected to its hollow structure. The output end of the blower is connected to one end of the second heat exchanger, and the other end of the second heat exchanger is connected to the hollow structure of the annular gas distributor.

8. a preparation system for sodium chloride crystals according to claim 7, characterized in that: The annular gas distributor is evenly distributed with a plurality of heating holes.

9. The preparation system of a sodium chloride crystal according to claim 7 or 8, wherein: The heating mechanism further comprises an automatic flushing mechanism, which comprises an automatic flushing valve and external flushing liquid. The annular gas distributor is communicated with the output end of the automatic flushing valve, and the input end of the automatic flushing valve is communicated with the external flushing liquid.

10. A system for preparing sodium chloride crystals according to claim 1, characterized in that: The upper end of the central tube has a flared end, and the flared end is in a trumpet shape that gradually opens from the inside to the outside.

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