KR20240001691A - Cooling baffle and reactor including the same - Google Patents

Abstract

The cooling baffle according to an embodiment of the present invention includes an outer tube, an inner tube inserted into the outer tube, and a sleeve located between the inner tube and the outer tube, and the sleeve is a protrusion protruding from the outer surface of the inner tube or a sleeve from the outer surface of the inner tube. It includes a concavely formed groove.

Description

Cooling baffle and reactor including same {COOLING BAFFLE AND REACTOR INCLUDING THE SAME}

The present invention relates to cooling baffles, and particularly to a cooling baffle installed in a polymerization reactor and a reactor including the same.

PVC reactors must be temperature controlled with a deviation of 5°C or less to improve product quality and prevent abnormal polymerization. For this reason, a device that can remove the reaction heat generated during polymerization is essential.

However, there is a limit to removing all the heat of polymerization using only a jacket installed outside the reactor. This is because the area of heat removal using a jacket is limited, and the total heat transfer coefficient is low due to the thickness and material of the reactor body.

In addition, a reflux condenser (RC) is installed to condense the VCM vapor and control the temperature. However, increasing the operation of RC adversely affects the quality of PVC products because the amount of cold liquid falling on the interface increases.

Therefore, a heat removal device such as a cooling baffle is installed inside the reactor to additionally remove the heat of polymerization. However, the cooling baffle installed inside is limited in size due to space constraints.

Therefore, the object is to provide a cooling baffle that can effectively remove reaction heat without increasing the size of the cooling baffle and a reactor including the same.

The cooling baffle according to an embodiment of the present invention includes an outer tube, an inner tube inserted into the outer tube, and a sleeve located between the inner tube and the outer tube, and the sleeve is a protrusion protruding from the outer surface of the inner tube or a sleeve from the outer surface of the inner tube. It includes a concavely formed groove.

The protrusion or groove may be formed in a spiral shape along the outer peripheral surface of the inner tube.

The width of the protrusion is formed at a ratio of 0.1 to 0.4 with respect to the circumference of the inner tube, and the thickness of the protrusion may be 1 mm to 12 mm.

The width of the groove is formed at a ratio of 0.3 to 0.7 with respect to the circumference of the inner tube, and the depth of the groove may be 1 mm to 3 mm.

The pitch of the protrusions and grooves may be formed at a ratio of 0.15 to 0.3 with respect to the length of the sleeve.

The stirring blade may be paddle-type.

A reactor according to another embodiment of the present invention includes a cooling baffle, a reaction vessel in which a plurality of cooling baffles are arranged along the circumference, and a paddle rotatably installed within the reaction vessel.

If projections or grooves are formed on the sleeve as in the embodiment of the present invention, the sleeve can be moved quickly by moving in a certain direction by the projections or grooves.

Additionally, if protrusions or grooves are formed on the sleeve as in the present invention, the effect of removing heat can be increased by increasing the area in contact with the fluid.

1 is a schematic perspective view of a reactor according to an embodiment of the present invention.
Figure 2 is a schematic perspective view of a cooling baffle according to an embodiment of the present invention.
Figure 3 is a schematic perspective view of the sleeve included in Figure 2;
Figure 4 is a diagram for explaining the pitch of the sleeve according to an embodiment of the present invention.
Figure 5 is a schematic perspective view of a cooling baffle according to another embodiment of the present invention.
Figure 6 is a schematic perspective view of the sleeve included in Figure 5;
FIG. 7 is an enlarged view of a portion of FIG. 5.

Hereinafter, with reference to the attached drawings, various embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The invention may be implemented in many different forms and is not limited to the embodiments described herein.

Since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, the present invention is not necessarily limited to what is shown.

In the drawing, the thickness is enlarged to clearly express various layers and areas. And in the drawings, for convenience of explanation, the thicknesses of some layers and regions are exaggerated. When a part of a layer, membrane, region, plate, etc. is said to be "on" or "on" another part, this includes not only being "directly above" the other part, but also cases where there is another part in between.

In addition, throughout the specification, when a part is said to "include" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

1 is a schematic perspective view of a reactor according to an embodiment of the present invention.

As shown in FIG. 1, the reactor 100 according to an embodiment of the present invention includes a reaction vessel 10 containing reactants, a cooling baffle 20 installed in the reaction vessel 10, and a stirrer 30. do.

The reactor 100 may be, for example, a polymerization reactor for polymer polymerization.

The reaction vessel 10 is not limited in shape, but may have a cylindrical structure and includes a cylindrical side wall portion, a bottom portion, and a cover portion to form a space for accommodating the reaction material. The reaction vessel 10 may be formed as a double-walled structure (not shown), and fluid may circulate inside the double-walled structure, and heat exchange may occur between the fluid and the reactants. That is, a heat exchange jacket may be installed in the reaction vessel.

The stirrer 30 includes a stirring blade 3 installed inside the reaction vessel to rotate the reactant, and a motor 7 having a rotating shaft 5 connected to the stirring blade 3 to rotate the stirring blade. The rotation axis 5 may be located in the center of the reaction vessel 3.

The stirring blade 3 is located inside the reaction vessel 10 and is coupled to the rotation shaft 5 and rotates by the rotation shaft.

The stirring blades 3 may be installed as a set of a plurality of blades at one end of the rotating shaft, and may be installed as a plurality of sets at regular intervals along the longitudinal direction of the rotating shaft for effective stirring of the reactants. One set of stirring blades 3 may include at least 2 to 4 stirring blades. The installation location and number of stirring blades can be selected in various ways depending on need.

The cooling baffle 20 is used to improve mixing of the reactants by changing the circumferential flow of the reactants to a vertical flow due to the rotation of the stirring blade 3, and to effectively remove reaction heat, and is used for heat exchange such as cooling water within it. It may be composed of pipes through which fluid flows.

The cooling baffle 20 maintains a constant temperature of the reactants through heat exchange with the reactants, thereby controlling the temperature, that is, performing a heat removal function.

The fluid for heat exchange may have a temperature of approximately 4 degrees Celsius to 35 degrees Celsius in the case of low temperature, and approximately 50 degrees Celsius to 200 degrees Celsius in the case of high temperature.

The cooling baffles 20 may be arranged in plural numbers and spaced apart along the circumferential direction of the reaction vessel 10. The plurality of cooling baffles 20 are installed along the circumferential direction of the reaction vessel 10 at a certain distance from the stirring blade 3, and may preferably be installed at equal intervals along the circumferential direction.

Figure 2 is a schematic perspective view of a cooling baffle according to an embodiment of the present invention, Figure 3 is a schematic perspective view of the sleeve included in Figure 2, and Figure 4 illustrates the pitch of the sleeve according to an embodiment of the present invention. This is a drawing for this purpose.

Referring to FIG. 2, each cooling baffle 20 may be a double pipe including an inner tube 21 and an outer tube 25 into which the inner tube 21 is inserted at regular intervals, and the inner tube 21 ) and a sleeve 23 is formed between the exterior 25. The sleeve 23 may be attached to the inner tube.

Through holes 11 are formed in the inner tube at regular intervals along the longitudinal and circumferential directions of the inner tube. The diameter of the through hole 11 may be 70 mm to 90 mm.

The sleeve 23 is a tube located between the inner tube and the outer tube, and the inner tube can be inserted inside. The sleeve 23 may be installed to prevent heat transfer loss between the inner pipe and the outer coolant. The outer surface of the sleeve 23 may include a protrusion 22 surrounding the inner tube in a spiral shape.

The protrusion 22 is in the form of a strip having a width W1 and a thickness T1 and surrounds the sleeve 23 in a spiral shape. The protrusion 22 may have a shape that protrudes from the outer surface of the sleeve 23 toward the inner surface of the exterior 25.

The width W1 of the protrusion 22 may be formed at a ratio of 0.1 to 0.4 with respect to the circumference of the inner tube 21, and the thickness T1 may be 1 mm to 12 mm. At this time, the spiral pitch P of the protrusion 22 may be formed to have a ratio of 0.15 to 0.3 with respect to the length of the sleeve. As the spiral pitch (P) decreases, the Q value improves, while the differential pressure within the pipe increases. As the spiral pitch increases, the Q value is inferior, but the differential pressure within the tube decreases, so the spiral pitch (P) is 0.15 with respect to the sleeve length. It is formed to have a ratio of 0.3 to 0.3 so that the differential pressure does not increase while the Q value improves.

Below, the results of experiments using cooling baffles according to the present invention and the prior art will be described.

The comparative example according to the prior art and Examples 1, 2, and 3 according to the present invention were the same polymerization reactor. In the comparative example, no protrusions were formed on the sleeve 23 of the cooling baffle, and in Example 1 and Example 3, no protrusions were formed on the sleeve 23 of the cooling baffle. In Examples 2 and 3, protrusions having pitches of 1000 mm, 1500 mm, and 1800 mm were formed on the sleeve of the cooling baffle, respectively. At this time, the total sleeve length was 6,150 mm, and the ratio of the spiral pitch to the sleeve length was 0.16 for Example 1, 0.24 for Example 2, and 0.29 for Example 3.

At this time, cooling water with the same temperature of 32°C was introduced into the cooling baffle, and the temperature at the outlet was measured.

[Table 1]

According to Newton's law of cooling (Q=h*A*ΔT), the amount of heat removed (Q) is proportional to the heat transfer coefficient (h). Referring to [Table 1], the h value of the comparative example is 11,635 W/m ² K. And, Example 1, Example 2, and Example 3 are 14,475 W/m ² K, 13,898 W/m ² K, and 13,720 W/m ² K, respectively, which is 18 to 25% higher than the comparative example, and the Q value is compared to In the example, it was 1,114,978, but in Examples 1, 2, and 3, it was 1,340,967, 1,296,233, and 1,282,049, respectively, which was 15 to 20% higher than the comparative example, confirming that the heat removal effect of Examples 1 to 3 was increased compared to the comparative example. there is.

Figure 5 is a schematic perspective view of a cooling baffle according to another embodiment of the present invention, Figure 6 is a schematic perspective view of the sleeve included in Figure 5, and Figure 7 is an enlarged view of a portion of Figure 5.

The cooling baffle according to another embodiment of the present invention shown in FIGS. 5 to 7 includes an outer tube 25, an inner tube 21 inserted into the outer tube 25, and a cooling baffle located between the outer tube 25 and the inner tube 21. Includes sleeve 24.

Referring to FIG. 5, contrary to the protrusion, a concave groove 26 may be formed in the sleeve 24 from the outer surface of the sleeve 24 toward the center. The groove 26 has a constant width and depth, the width W2 of the groove 26 is formed at a ratio of 0.3 to 0.7 with respect to the circumference of the inner tube, and the depth T2 of the groove 26 is 1 mm to 3 mm. am. At this time, the spiral pitch (P) of the groove 26 is the same as the protrusion, and may be formed at a ratio of 0.15 to 0.3 with respect to the length of the sleeve.

[Table 2]

In Examples 4 and 5, grooves having pitches of 1000 mm and 1800 mm are formed in the sleeve of the cooling baffle according to an embodiment of the present invention, respectively. At this time, the total sleeve length was 6,150 mm, and the ratio of the spiral pitch to the sleeve length was 0.16 in Example 4 and 0.29 in Example 5. At this time, cooling water with the same temperature of 32°C was introduced into the cooling baffle, and the temperature at the outlet was measured.

Referring to [Table 2], it can be seen that the ΔP of Example 4 is 0.75, and the ΔP of Example 5 is 0.66, which is lower than the ΔP of 0.91 in the comparative example in [Table 1].

Examples 4 and 5 have the same pitch as Examples 1 and 3, and it can be seen that the differential pressure is reduced in Examples 4 and 5, which are grooves, compared to Examples 1 and 3, which are formed as protrusions. In this way, as in one embodiment of the present invention, protrusions or grooves having an appropriate pitch can be formed in consideration of heat removal and pressure differential.

As described above, if projections or grooves are formed on the sleeve as in the embodiment of the present invention, the sleeve can be moved quickly by moving in a certain direction by the projections or grooves.

Additionally, by forming protrusions or grooves on the sleeve according to an embodiment of the present invention to have a certain width and thickness (or depth), the effect of removing heat can be increased by increasing the area in contact with the fluid.

Additionally, by forming a groove in the sleeve, the flow rate at which the fluid moves can be increased, thereby increasing the effect of removing heat by moving more fluid more quickly.

Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto and may be implemented with various modifications within the scope of the claims, detailed description of the invention, and accompanying drawings.

Claims (7)

Exterior,
An inner tube inserted into the exterior,
Sleeve located between the inner tube and the outer tube
Including,
The sleeve is a cooling baffle including a protrusion protruding from the outer surface of the inner tube or a groove concavely formed from the outer surface of the inner tube. In paragraph 1:
A cooling baffle in which the protrusion or groove is formed in a spiral shape along the outer peripheral surface of the inner tube. In paragraph 1:
The width of the protrusion is formed at a ratio of 0.1 to 0.4 with respect to the circumference of the inner tube,
A cooling baffle where the thickness of the protrusion is 1 mm to 12 mm. In paragraph 1:
The width of the groove is formed at a ratio of 0.3 to 0.7 with respect to the circumference of the inner tube,
A cooling baffle wherein the depth of the groove is 1 mm to 3 mm. In paragraph 1:
A cooling baffle in which the pitch of the protrusions and grooves is formed at a ratio of 0.15 to 0.3 with respect to the length of the sleeve. In paragraph 1:
The stirring blade is a paddle-type cooling baffle. The cooling baffle of any one of claims 1 to 6,
A reaction vessel in which a plurality of cooling baffles are arranged along the circumference,
Paddle rotatably installed within the reaction vessel
A reactor containing a.

Images