Sugar boiling crystallizing tank applied to refined sugar

Abstract

The utility model discloses a sugar boiling crystallizing tank applied to refined sugar, which comprises a tank body, the tank body comprises a heating chamber and a juice steam chamber, the juice steam chamber is positioned above the heating chamber, a plurality of heating tube nests, a central downcomer, a circulating pipe, a light ammonia discharge pipe and a heavy ammonia discharge pipe are arranged in the heating chamber, and a juice catcher is arranged at the top of the juice steam chamber. The juice catcher is provided with a juice steam outlet connected with the outer side of the tank body, a juice steam baffle is arranged below the juice catcher and located in the middle of the juice steam chamber, the outer side of the top of the juice steam chamber is sunken downwards towards the middle position, a stirring mechanism is arranged at the sunken position, and an output shaft of the stirring mechanism extends into the tank body and is connected with a detachable bearing on the outer side of the bottom of the tank body. The crystallization tank is reasonable in design, the circulation ratio of the crystallization tank is reduced due to the design of the circulation pipe, the convective circulation effect of massecuite in the crystallization tank is remarkable, in addition, the heat transfer effect is good, low-pressure juice steam can be comprehensively used as a heat source, and therefore the thermal economic benefit of a whole plant is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sugar making equipment, in particular to a sugar boiling crystallization tank used for refined sugar. Background Art

[0002] In the traditional sugar production process, sugar juice is concentrated to a syrup with a concentration of 65-70°Bx through evaporation. The task of sugar crystallization is to concentrate the syrup to a certain supersaturation, precipitate sucrose crystals, and gradually grow the crystals to the desired particle size, boiling the sugar massecuite to maximize sucrose extraction. The crystallizer completes this sugar boiling step, simultaneously performing both heat and mass transfer. The performance of the crystallization process and the rationality of the crystallizer structure directly impact product recovery and quality. Therefore, evaluating the quality of a crystallizer requires the following key criteria: 1. Good convection of the sugar massecuite within the crystallizer; 2. Adequate heating surface; 3. Vacuum operation; 4. A small crystallization volume; 5. Minimize static pressure effects; 6. Even distribution of feed material into the crystallizer; 7. Effective removal of condensate and ammonia vapor; and 8. Excellent mist separation in the juice collector.

[0003] Traditional crystallizers are mostly steam drum crystallizers, which consist of a heating chamber, a bottom cover, a juice steam chamber, an intermediate downcomer, a juice catcher, a stirring device and some auxiliary devices. Traditional crystallizers with these structures still have many shortcomings, such as: 1. The circulation ratio of the crystallizer (that is, the ratio of the total cross-sectional area of ​​the crystallizer's heating tubes to the cross-sectional area of ​​the downcomers) is too large, and the cross-sectional area of ​​the central downcomer is too small, which is not conducive to the natural circulation of the sugar paste; 2. The ratio of the crystallizer's heating area to the effective volume of the crystallizer (S / V) is too small, and the heating surface is insufficient, and low-pressure juice steam cannot be used as a heat source, affecting the thermal energy economy of the entire plant; 3. The crystallization volume is too large, and the size of the crystals after cooking into a pot of sugar paste is too small, affecting product quality and recovery; 4. The sugar paste liquid level line in the crystallizer is too high, which increases the static pressure, increases the boiling point of the sugar paste, reduces the supersaturation, and reduces the heat transfer temperature difference, affecting the normal progress of the crystallization process and weakening the convection circulation of the sugar paste in the crystallizer. Utility Model Content

[0004] Based on this, the purpose of the present invention is to provide a sugar boiling crystallization tank used for refined sugar to solve the technical problems raised in the above background.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A sugar boiling crystallization tank for refined sugar, comprising a tank body, the tank body comprising a heating chamber and a juice vapor chamber, the juice vapor chamber being located above the heating chamber, the heating chamber being provided with a plurality of heating tubes, a central downcomer, a circulation pipe, a light ammonia discharge pipe and a heavy ammonia discharge pipe, the top of the juice vapor chamber being provided with a juice catcher, the juice catcher being provided with a juice vapor outlet connected to the outside of the tank body, a juice vapor baffle being provided below the juice catcher in the middle of the juice vapor chamber, the outer side of the top of the juice vapor chamber being recessed downwardly toward the middle position, and a stirring mechanism being provided at the recess, the output shaft of the stirring mechanism extending into the tank body and connected to a detachable bearing on the outer side of the bottom of the tank body.

[0006] Furthermore, the central downcomer is located at the center of the heating chamber, one end of the light ammonia discharge pipe is located at the upper end of the central downcomer, and the other end is connected to the main transport pipe installed on the outside of the tank body, and one end of the heavy ammonia discharge pipe is located at the lower end of the central downcomer, and the other end is connected to the main transport pipe installed on the outside of the tank body.

[0007] Furthermore, the circulation pipe is located on one side of the heating chamber and is also connected to a massecuite sampling point and a powder feeding and crystallization point. A microwave hammer meter and a liquid level sensor are also installed in the circulation pipe.

[0008] Furthermore, the juice steam chamber and the juice catcher are both provided with a steam cleaning pipe.

[0009] Furthermore, the top and sides of the juice steam chamber are provided with inspection manholes.

[0010] Furthermore, two inverted cone-shaped discharge ports are provided below the heating chamber, and the distance between the two inverted cone-shaped discharge ports is half of the diameter of the juice steam chamber.

[0011] The utility model has the following beneficial effects:

[0012] 1. The crystallizer equipment has a reasonable structural design. The design of the circulation pipe reduces the circulation ratio of the crystallizer. The patented design has a circulation ratio of 2.29. The ratio of the central downcomer to the crystallizer body diameter is 40%, and the convection circulation effect of the massecuite in the crystallizer is significant.

[0013] 2. The ratio of heating area to effective volume (S / V) of this crystallizer is 8.0, with good heat transfer effect. Low-pressure steam can be fully used as heat source, thereby improving the thermal economic benefits of the entire plant;

[0014] 3. The two inverted conical discharge ports at the bottom of the crystallizer have a cone angle of 17°, which can effectively reduce the crystallization volume. The patented design achieves a ratio of crystallization volume to effective volume of 42%, which can ensure that the crystal size of a can of sugar paste is uniform, thereby improving product quality and recovery.

[0015] 4. The non-condensable gas discharge piping system designed for crystallizer heating is divided into a low-density light ammonia discharge piping system and a high-density heavy ammonia discharge piping system. The light ammonia discharge loop pipe is independently led out from the top of the steam drum, and the heavy ammonia discharge loop pipe is independently led out from the bottom of the steam drum. The two are finally merged into the main pipe for discharge. This structural design allows for complete ammonia vapor discharge and high steam drum heat transfer efficiency.

[0016] 5. The upper part of the juice collector of the crystallizer is designed to be concave, which can reduce the installation height of the stirring mechanism, shorten the length of the stirring shaft, reduce the operating load of the stirring device, reduce the axial swing of the stirring shaft, and make the stirring device run smoothly;

[0017] 6. The lower shaft of the crystallization tank stirring mechanism is designed to be detachable, and the worn parts can be replaced in a short time, which is convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the heating chamber of the present utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] The following describes an embodiment of the present invention based on its overall structure.

[0022] like Figure 1 、 Figure 2 As shown, the utility model includes a tank body 1, which includes a heating chamber 2 and a juice vapor chamber 3. The juice vapor chamber 3 is located above the heating chamber 2. The heating chamber 2 is provided with a plurality of heating tubes 4, a central downcomer 7, a circulation pipe 8, a light ammonia discharge pipe 5 and a heavy ammonia discharge pipe 6. A juice catcher 15 is provided on the top of the juice vapor chamber 3. The juice catcher 15 is provided with a juice vapor outlet 16 connected to the outside of the tank body 1. A juice vapor baffle 17 is provided below the juice catcher 15 in the middle of the juice vapor chamber 3. The outer side of the top of the juice vapor chamber 3 is recessed downward toward the middle position, and a stirring mechanism 19 is provided at the recess. The output shaft of the stirring mechanism 19 extends into the tank body 1 and is connected to a detachable bearing 22 on the outer side of the bottom of the tank body 1. A stirring blade 14 is installed on the output shaft of the stirring mechanism 19, and the stirring blade 14 is provided in the central downcomer 7.

[0023] The utility model provides a recess on the outer side of the top of the juice vapor chamber 3, so as to reduce the installation height of the stirring mechanism 19, shorten the length of the stirring shaft, reduce the operating load of the stirring device, reduce the axial swing of the stirring shaft, and make the stirring mechanism 19 run smoothly. A sugar juice reflux collection pipe 20 is provided at the lowest point of the lower outer edge of the juice catcher, which is extended to the collection box outside the crystallizer. The purpose is to process the sugar juice collected by the juice catcher separately and prevent it from flowing back into the crystallizer and mixing with the boiled sugar paste. The juice vapor chamber and the juice catcher are provided with a steam cleaning pipe 21, and the wear parts of the detachable bearing 22 can be replaced in a short time, which is convenient for maintenance.

[0024] The central downcomer 7 is located at the center of the heating chamber 2, one end of the light ammonia discharge pipe 5 is located at the upper end of the central downcomer 7, and the other end is connected to the main delivery pipe installed on the outside of the tank body 1, one end of the heavy ammonia discharge pipe 6 is located at the lower end of the central downcomer 7, and the other end is connected to the main delivery pipe installed on the outside of the tank body 1, and the light ammonia discharge pipe 5 and the heavy ammonia discharge pipe 6 are provided with through holes below one end of the central downcomer 7, and the two are finally merged into the main pipe for discharge.

[0025] The circulation pipe 8 of the present invention is a half-moon circulation pipe and is located on one side of the heating chamber 2. The circulation pipe 8 is connected to the sugar paste sampling point 9 and the powder feeding and crystallization starting point 12. A microwave hammer meter 10 and a liquid level sensor 11 are also installed in the circulation pipe 8. In addition to serving as a circulation pipe to enhance the convection circulation of the sugar paste, the half-moon circulation pipe 8 also serves as the sugar paste sampling point 9 of the crystallization tank, the installation point of the microwave hammer meter 10, the installation point of the crystallization tank liquid level sensor 11, and the powder feeding and crystallization starting point 12 of the crystallization tank. Such a structural design makes the crystallization tank more efficient and more functional.

[0026] The utility model is provided with two inverted conical discharge ports 13 below the heating chamber 2. The distance between the two inverted conical discharge ports 13 is half of the diameter of the juice steam chamber 3. In order to reduce the crystallization volume, the inverted conical discharge ports 13 have a cone angle inclination of 17°. The height between the two inverted conical discharge ports 13 and the lower tube plate of the heating chamber 2 is 180 mm. This height reduces the crystallization volume of the tank body as much as possible and reserves space for equipment manufacturing and welding operations. The ratio of the crystallization volume to the effective volume of the patent design is 42%. The height of the two inverted conical discharge ports 13 and the liquid level line of the tank body into sugar paste can be designed according to this value.

[0027] The relevant parameters of the crystallization tank design of the present invention are as follows: (1) the circulation ratio of the crystallization tank is 2.29; (2) the ratio of the central downcomer to the diameter of the crystallization tank body is 40%; (3) the ratio of the heating area to the effective volume of the crystallization tank (S / V) is 8.0; (4) the ratio of the crystallization volume to the effective volume is 42%. The above parameters are the theoretical design basis of this application. The structural design of the present invention designed and manufactured on this theoretical basis has a significant effect on strengthening the convection circulation of the sugar paste in the tank, improving the heat transfer efficiency, improving the product quality, improving the product recovery, and saving energy and reducing consumption.

[0028] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not limitations on the present invention. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and purpose of the present invention, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A sugar boiling crystallization tank used for refined sugar, comprising a tank body, characterized in that: The tank body includes a heating chamber and a juice vapor chamber. The juice vapor chamber is located above the heating chamber. A plurality of heating tubes, a central downcomer, a circulation pipe, a light ammonia discharge pipe and a heavy ammonia discharge pipe are provided in the heating chamber. A juice catcher is provided on the top of the juice vapor chamber. The juice catcher is provided with a juice vapor outlet connected to the outside of the tank body. A juice vapor baffle is provided below the juice catcher in the middle of the juice vapor chamber. The outer side of the top of the juice vapor chamber is recessed downward toward the middle position, and a stirring mechanism is provided at the recess. The output shaft of the stirring mechanism extends into the tank body and is connected to a detachable bearing on the outer side of the bottom of the tank body.

2. The sugar boiling crystallization tank for refined sugar according to claim 1, characterized in that: The central downcomer is located at the center of the heating chamber, one end of the light ammonia discharge pipe is located at the upper end of the central downcomer, and the other end is connected to the main transport pipe installed on the outside of the tank body; one end of the heavy ammonia discharge pipe is located at the lower end of the central downcomer, and the other end is connected to the main transport pipe installed on the outside of the tank body.

3. The sugar boiling crystallization tank for refined sugar according to claim 1, characterized in that: The circulation pipe is located on one side of the heating chamber and is also connected to a massecuite sampling point and a powder feeding and crystallization point. A microwave hammer meter and a liquid level sensor are also installed in the circulation pipe.

4. The sugar boiling crystallization tank for refined sugar according to claim 1, characterized in that: The juice steam chamber and the juice catcher are both provided with steam cleaning pipes.

5. The sugar boiling crystallization tank for refined sugar according to claim 1, characterized in that: The top and sides of the juice steam chamber are both provided with inspection manholes.

6. The sugar boiling crystallization tank for refined sugar according to claim 1, characterized in that: Two inverted cone-shaped discharge ports are provided below the heating chamber, and the distance between the two inverted cone-shaped discharge ports is half of the diameter of the juice steam chamber.

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