A multi-turn cooling coil for a horizontal cooling crystallizer

Abstract

The present invention relates to a multi-turn cooling coil for a horizontal cooling crystallizer. The multi-turn cooling coil includes at least two turns of cooling coils and a hollow shaft cooling water channel. The inlet and outlet of the cooling coil are connected to the hollow shaft cooling water channel, and a cooling medium is introduced into the cooling coil through the hollow shaft cooling water channel. The cooling medium exchanges heat with the material through the cooling coil to cool the material until the material crystallizes, and the crystallized material is discharged. The multi-turn cooling coil arranges multiple turns of cooling coils in a cross-section, so that there are cooling coils in the entire circular cross-section of the entire crystallizer housing, and there are cooling cross-sections in each area. The material inside the equipment can be evenly and fully heat-exchanged, and significant improvements have been made in both the heat exchange area and the heat exchange efficiency, thus greatly improving the production efficiency and production capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling crystallization, and particularly to a multi-loop cooling coil suitable for cooling crystallization of various materials in the biochemistry industry. Background Art

[0002] Currently, in the prior art, horizontal crystallization machines are mostly used for cooling crystallization devices. The heat exchange structure of this crystallization machine consists of an external cooling jacket and an internal cooling coil. Since the internal cooling coil is only a single-loop cooling coil structure, it results in insufficient heat exchange area and uneven heat exchange, seriously affecting the heat exchange efficiency and reducing the production capacity. Summary of the Invention

[0003] The present invention aims to provide a multi-loop cooling coil for a horizontal cooling crystallizer, and the technical problems to be solved include how to achieve energy conservation and consumption reduction while improving production capacity.

[0004] The object of the present invention is to solve the deficiencies of the prior art and provide a multi-loop cooling coil for a horizontal cooling crystallizer. The multi-loop cooling coil includes a cooling coil with a number of loops greater than or equal to 2 and a hollow shaft cooling water channel. The inlet and outlet of the cooling coil are connected to the hollow shaft cooling water channel. Cooling medium is introduced into the cooling coil through the hollow shaft cooling water channel. The cooling medium exchanges heat with the material through the cooling coil to cool the material until the material crystallizes, and the crystallized material is discharged.

[0005] Preferably, the cooling coil includes an inlet coil, intermediate coils, connecting pipes, and an outlet coil; the inlet coil, intermediate coils, and outlet coil all include multiple loops of coils arranged in a cross-section. One or more groups of intermediate coils are provided. The inlet and outlet of the inlet coil are connected to the hollow shaft cooling water channel; the inlet coil and the intermediate coils, between adjacent intermediate coils, and between the intermediate coil adjacent to the outlet coil and the outlet coil are all connected by connecting pipes; the outlet of the outlet coil is connected to the hollow shaft cooling water channel; the cooling medium enters the multi-loop cooling coil from the hollow shaft cooling water channel through the inlet coil, flows through the connecting pipes and intermediate coils in sequence and enters the outlet coil, and finally flows out from the outlet coil and returns to the cooling water outlet end of the hollow shaft cooling water channel.

[0006] Preferably, a plurality of support rods are provided between the multiple loops of coils arranged in a cross-section to strengthen and reinforce the cooling coil, so that the cooling coil has sufficient strength.

[0007] Preferably, adjacent connecting pipes are arranged at different heights.

[0008] Preferably, the multiple coils arranged on the same cross-section are arranged concentrically.

[0009] Preferably, the hollow shaft cooling water channel is communicated with the inlet coil and the outlet coil through a straight pipe with an arc-shaped transition section.

[0010] Further preferably, among the multiple coils arranged on the same cross-section, adjacent coils are connected by a special-shaped connecting pipe, and the shape of the special-shaped connecting pipe conforms to the following function:

[0011] ;

[0012] where ρ is the straight-line distance between any point on the special-shaped connecting pipe and the center of the multiple coils arranged on the same cross-section;

[0013] R1 is the diameter of the larger-diameter coil among adjacent coils;

[0014] R2 is the diameter of the smaller-diameter coil among adjacent coils;

[0015] Ф is the abscissa value of any point on the special-shaped connecting pipe in a rectangular coordinate system with the center of the multiple coils arranged on the same cross-section as the origin.

[0016] In another embodiment, the multiple cooling coils are in the form of spiral coils with a number greater than or equal to 2; the spiral coils include an inner spiral coil, an outer spiral coil, and a support rod; the inlets and outlets of the inner spiral coil and the outer spiral coil are both connected to the hollow shaft cooling water channel to form a cooling loop; the support rod is arranged between the inner spiral coil and the outer spiral coil.

[0017] Preferably, the spiral coil further includes an intermediate spiral coil, and the intermediate spiral coil is arranged between the inner spiral coil and the outer spiral coil; the inlets and outlets of the intermediate spiral coil are also connected to the hollow shaft cooling water channel to form a cooling loop.

[0018] Further preferably, the inner spiral coil, the intermediate spiral coil, and the outer spiral coil are arranged concentrically; the support rod extends radially along the inner spiral coil, the intermediate spiral coil, and the outer spiral coil.

[0019] Advantageous Effects

[0020] Compared with the prior art, the advantageous effects of the present invention are:

[0021] The multi - loop cooling coil for a horizontal cooling crystallizer described in the present invention is a multi - loop cooling coil applicable to the cooling crystallization of various materials such as acids, alkalis, and salts in production technology industries such as bio - chemical sugars, alcohols (such as glucose, sorbitol, mannitol, etc.), amino acid industries (such as sodium glutamate, citric acid, etc.), pharmaceutical industries, and other chemical industries. This multi - loop cooling coil arranges multiple loops of cooling coils in one cross - section, so that there are cooling coils throughout the entire circular cross - section inside the entire crystallizer housing, and there are cooling cross - sections in each area. The materials inside the equipment can obtain uniform and sufficient heat exchange, and significant improvements have been made in both the heat exchange area and the heat exchange efficiency, thus greatly improving the production efficiency and production capacity.

[0022] The multi - loop cooling coil for a horizontal cooling crystallizer described in the present invention can perfectly solve the problems existing in the existing horizontal cooling crystallizer (apparatus), greatly improve the production capacity, and at the same time, respond to the national policy of energy conservation and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are used to provide a further understanding of the technical solution of the present invention, and constitute a part of the specification. Together with the specific embodiments of the present application, they are used to explain the technical solution of the present invention, and do not constitute a limitation to the technical solution of the present invention.

[0024] Figure 1 It is a schematic diagram of the cooling water flow of the multi - loop cooling coil for a horizontal cooling crystallizer described in the present invention.

[0025] Figure 2 is Figure 1 a cross - sectional view of the inlet cooling coil of the multi - loop cooling coil shown.

[0026] Figure 3 is Figure 1 a cross - sectional view of the intermediate cooling coil of the multi - loop cooling coil shown.

[0027] Figure 4 is Figure 1 a cross - sectional view of the outlet cooling coil of the multi - loop cooling coil shown.

[0028] Figure 5 is a schematic diagram of the cooling water flow of the multi - loop cooling coil of another embodiment.

[0029] Figure 6 is Figure 5 a cross - sectional view of the 2 - loop cooling coil of the multi - loop cooling coil shown.

[0030] Figure 7 is Figure 5 a cross - sectional view of the multi - loop cooling coil with 3 or more loops shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention is described in more detail hereinafter to facilitate the understanding of the present invention.

[0032] In the prior art, the cooling coil of a horizontal cooling crystallizer is in the form of a single-loop spiral tube, which is connected by a hollow shaft. As the drive shaft rotates, the two ends of the drive shaft are connected to rotary joints, and cooling water enters from one end and flows out from the other end to form a cooling system. Since the cooling coil has only a single loop (1 loop), the cooling area is limited, and the heat transfer requirements of the crystallizer cannot be met. Moreover, the heat transfer is uneven. Only the area near the coil has sufficient heat transfer, while the area far from the coil cannot achieve sufficient and uniform heat transfer, resulting in low heat transfer efficiency and poor heat transfer effect.

[0033] In view of the problems existing in the horizontal cooling crystallizer in the prior art, the present application has studied a new type of cooling coil. This new type of cooling coil is a multi-loop cooling coil, which can perfectly solve the problems existing in the horizontal cooling crystallizer in the prior art, greatly improve the production capacity, and at the same time achieve energy conservation and consumption reduction, in response to the national policy of energy conservation and consumption reduction.

[0034] The present invention provides a multi-loop (greater than or equal to 2 loops) cooling coil for a horizontal cooling crystallizer. The multi-loop cooling coil includes a cooling coil with greater than or equal to 2 loops and a hollow shaft cooling water channel. The coil inlet and outlet of the cooling coil are connected to the hollow shaft cooling water channel. Cooling medium is introduced into the cooling coil through the hollow shaft cooling water channel. The cooling medium exchanges heat with the material through the cooling coil to cool the material until the material crystallizes, and the crystallized material is discharged.

[0035] The cooling coil is divided into two structures. The first structure is a multi-loop circular coil. As Figures 1 to 4 shown, this structure is composed of an inlet coil 1, an intermediate coil 2, a connecting pipe 3, an outlet coil 4 and a support rod 5; the inlet coil 1, the intermediate coil 2 and the outlet coil 4 all include multi-loop coils arranged in a cross-section. The intermediate coil 2 is provided with one or more groups. The inlet and outlet of the inlet coil 1 are connected to the hollow shaft cooling water channel 10; the inlet coil 1 and the intermediate coil 2, between adjacent intermediate coils 2, and between the intermediate coil 2 adjacent to the outlet coil 4 and the outlet coil 4 are all connected by the connecting pipe 3; the outlet of the outlet coil 4 is connected to the hollow shaft cooling water channel 10; the cooling medium enters the multi-loop cooling coil from the hollow shaft cooling water channel 10 through the inlet coil 1, flows through the connecting pipe 3 and the intermediate coil 2 in sequence and enters the outlet coil 4, and finally flows out from the outlet coil and returns to the cooling water outlet end of the hollow shaft cooling water channel 10.

[0036] There are multiple support rods 5 arranged between the multi - loop coiled pipes arranged on one cross - section, which are used to strengthen and reinforce the cooling coiled pipes so that the cooling coiled pipes have sufficient strength.

[0037] As Figure 1 shown, adjacent connecting pipes 3 are arranged at different heights.

[0038] Preferably, the multi - loop coiled pipes arranged on the same cross - section are arranged concentrically.

[0039] Preferably, the hollow - shaft cooling water channel 10 is communicated with the inlet coiled pipe 1 and the outlet coiled pipe 4 through a straight pipe with an arc - shaped transition section.

[0040] Further preferably, among the multi - loop coiled pipes arranged on the same cross - section, adjacent coiled pipes are connected by a special - shaped connecting pipe, and the shape of the special - shaped connecting pipe conforms to the following function:

[0041] ;

[0042] where ρ is the straight - line distance between any point on the special - shaped connecting pipe and the center of the multi - loop coiled pipes arranged on the same cross - section;

[0043] R1 is the diameter of the larger - diameter coiled pipe among adjacent coiled pipes;

[0044] R2 is the diameter of the smaller - diameter coiled pipe among adjacent coiled pipes;

[0045] Ф is the abscissa value of any point on the special - shaped connecting pipe in a rectangular coordinate system with the center of the multi - loop coiled pipes arranged on the same cross - section as the origin.

[0046] The function that the shape of the special - shaped connecting pipe conforms to is obtained through a large number of experiments and combined with numerical fitting. During the experiment, the applicant made a large number of different connecting pipes to connect the multi - loop coiled pipes arranged on the same cross - section, including straight - pipe connection, arc - shaped pipe connection with different curve forms, and hybrid connection of arc - shaped pipe and straight - pipe. The experimental results show that, under the same other reaction conditions, compared with the way of completely using straight - pipe connection, the hybrid connection way of arc - shaped pipe and straight - pipe has little change in heat - transfer efficiency, and the difference only fluctuates between 0.5% and 0.9%.

[0047] Compared with the connection method that completely uses straight pipes, the arc-shaped pipes with different curve forms show significantly better heat transfer efficiency. Among the 156 arc-shaped pipes manufactured by the applicant, 16 have a heat transfer efficiency increased by 5% to 10% compared with completely using straight pipes, 138 have a heat transfer efficiency increased by 10.2% to 20% compared with completely using straight pipes, and 2 have a heat transfer efficiency increased by 25.6% and 30.1% compared with completely using straight pipes.

[0048] The applicant input the dimension data of the arc-shaped pipe with the best performance (the arc-shaped pipe with a heat transfer efficiency increased by 30.1% compared with completely using straight pipes) into the GNU Octave tool (the source code of which can be found at the GNU download site ftp: / / ftp.gnu.org / gnu / octave) for data fitting, and obtained the functional form that the shape of the above-mentioned preferred special-shaped connecting pipe conforms to.

[0049] The second structure is a multi-turn (greater than or equal to 2 turns) spiral coil type. As Figures 5 to 7 shown, this structure is composed of an inner spiral coil 21, an intermediate spiral coil 22, an outer spiral coil 23 and a support rod 24; when the coil is 2 turns, there is no intermediate spiral coil 22, and this structure is composed of an inner spiral coil 21, an outer spiral coil 23 and a support rod 24. The inlet and outlet of each turn of the spiral coil are connected to the hollow shaft cooling water channel to form a cooling circuit.

[0050] The multi-turn cooling coil for the horizontal cooling crystallizer described in the present invention is a multi-turn cooling coil, that is, multiple turns of cooling coils are arranged in a cross-section, so that there are cooling coils in the entire circular cross-section of the entire crystallizer housing, and there are cooling cross-sections in each area. The materials inside the equipment can be uniformly and fully heat-exchanged, and both the heat exchange area and the heat transfer efficiency are significantly improved, thereby greatly improving the production efficiency and production capacity.

[0051] The preferred embodiments of the present invention have been described above, but they are not intended to limit the present invention. Those skilled in the art can make improvements and changes to the embodiments disclosed herein without departing from the scope and spirit of the present invention.

Claims

1. A multi-turn cooling coil for a horizontal cooling crystallizer, characterized in that, The multi - loop cooling coil for a horizontal cooling crystallizer includes a cooling coil with no less than 2 loops and a hollow - shaft cooling water channel. The inlet and outlet of the cooling coil are connected to the hollow - shaft cooling water channel. Cooling medium is introduced into the cooling coil through the hollow - shaft cooling water channel. The cooling medium exchanges heat with the material through the cooling coil to cool the material until the material crystallizes, and then the crystallized material is discharged. The cooling coil includes an inlet coil, intermediate coils, connecting pipelines, and an outlet coil. The inlet coil, intermediate coils, and outlet coil all include multiple loops of coils arranged in one cross - section. There is one group or multiple groups of intermediate coils. The inlet and outlet of the inlet coil are connected to the hollow - shaft cooling water channel. The inlet coil and the intermediate coils, adjacent intermediate coils, and the intermediate coil adjacent to the outlet coil and the outlet coil are connected by connecting pipelines. The outlet of the outlet coil is connected to the hollow - shaft cooling water channel. The cooling medium enters the multi - loop cooling coil from the hollow - shaft cooling water channel through the inlet coil, flows through the connecting pipelines and intermediate coils in sequence, enters the outlet coil, and finally flows out of the outlet coil and returns to the cooling water outlet end of the hollow - shaft cooling water channel. The hollow - shaft cooling water channel is connected to the inlet coil and the outlet coil through straight pipes with arc - shaped transition sections. Among the multiple loops of coils arranged in one cross - section, adjacent coils are connected by special - shaped connecting pipes. The shape of the special - shaped connecting pipe conforms to the following function: where ρ is the straight - line distance between any point on the special - shaped connecting pipe and the center of the multiple loops of coils arranged in one cross - section. R1 is the diameter of the larger - diameter coil among adjacent coils. R2 is the diameter of the smaller - diameter coil among adjacent coils. Ф is the abscissa value of any point on the special - shaped connecting pipe in a rectangular coordinate system with the center of the multiple loops of coils arranged in one cross - section as the origin.

2. The multi-turn cooling coil for a horizontal cooling crystallizer according to claim 1, wherein, There are multiple support rods between the multiple loops of coils arranged in one cross - section, which are used to strengthen and reinforce the cooling coil to make the cooling coil have sufficient strength.

3. The multi-turn cooling coil for a horizontal cooling crystallizer according to claim 1, wherein, Adjacent connecting pipelines are arranged at different heights.

4. The multi-turn cooling coil for a horizontal cooling crystallizer according to claim 1, wherein The multiple loops of coils arranged in one cross - section are arranged concentrically.

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