JPS5928228Y2 - fluid heat exchange equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid heat exchange device, particularly a device for extremely simply and effectively cooling a highly viscous liquid fluid, such as a molten fluid of a thermoplastic polymeric material such as polyester or polyamide.

After polyethylene terephthalate is produced continuously, the temperature of the molten polymer is kept at the same level as the spinning process in so-called continuous direct spinning, in which polyethylene terephthalate is produced continuously and then kept in its molten state without being cooled and turned into chips and then introduced into a spinning device to form yarn. Generally, the higher the polymerization temperature, the faster the reaction rate and the greater the productivity.

For example, when the spinning temperature is 285℃, if you use a device that can increase the capacity by about 1.5 times at 300℃ compared to when polymerization is performed at this temperature, this temperature difference of about 15℃ can be reduced by the polymerization device. and the spinning equipment.

However, in order to cool such highly viscous fluids, the commonly used multi-tubular or stirred heat exchangers are not only expensive and occupy a large space, but also create dead space and generate a large amount of degraded polymer. Therefore, there are many problems and it is difficult to use it for practical use as an operating machine.

Further, the single tube jacket cooling type is extremely simple and does not take up much space, but with high viscosity fluids, cooling is mainly performed only on the tube wall side, and the cooling effect is poor, making it difficult to achieve uniform cooling.

The present invention was developed in view of the current situation, and it covers an outer tube that has an inlet/outlet for the heat medium on the outside of the tube, and also covers the inside of the tube with openings that gradually open from the center toward the periphery. This is a fluid heat exchange device characterized in that a dispersion body having a large amount of water is provided in a direction substantially perpendicular to the axis of a tube body.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a view taken along the line A--A in FIG.

In the figure, reference numeral 1 denotes a tube forming a passage for the fluid to be cooled, and an outer tube 2 having a heat medium supply nozzle 3 and a discharge nozzle 4 is provided on the outside of the tube 1. A jacket 5 is formed between the outer tube 2 and the outer tube 2.

Reference numeral 6 denotes a dispersion body fixed in a direction substantially perpendicular to the axis of the tube body 1, and a sintered wire mesh 7 formed so that the opening gradually increases from the center toward the periphery as shown in FIG. and a reinforcing wire mesh 8 (which may be supported from both sides) that supports this, and a metal rim 9 that clamps and fixes these wire meshes 7 and 8.
(It may also be a ring-shaped plate).

Reference numeral 10 denotes a holder for fixing the dispersion element 6, and is composed of two flanges 12 having a groove 11 for holding the rim 9 therebetween.

13 is a gasket, and 14 is a bolt. Normally, the center part of the sintered wire mesh 7 has a gap of 1 to 50μ, and the peripheral part has a gap of 10 to 50μ.
Used in the range of 500μ, and reinforcing wire mesh 8:20~10
Something about 0 mesh is used.

For example, at 300°C, discharged from the final polymerization tank,
The molten polyethylene terephthalate polymer of 1500 poise is sent by a transport means (not shown) to the heat exchanger of the present invention provided in the pipe line between the polymerization tank and the spinning device.

Here, the flow velocity distribution of the molten polymer sent from the direction indicated by the arrow in Fig. 1 is reversed by the dispersion 6, slowing in the center and faster on the tube wall side, and when it passes through the dispersion 6 in this state, the original flow velocity distribution is restored again. Because the mixture returns to
Therefore, by passing a fluid at around 265° C. as a cooling heat medium through the jacket 5, effective heat exchange is performed.

Therefore, by arranging a plurality of dispersions 6 in series, it is possible to cool the spinning material at 285°C1, which is the spinning temperature, and since there is no room for dead space, there is almost no deterioration of the polymer and a uniform temperature distribution. The molten polymer is fed to the spinning device at the optimum temperature, and
It will be possible to significantly improve the manufacturing capacity for direct spinning on wheels.

Although an example of direct spinning of polyethylene terephthalate in a truck has been described above, the present invention is not limited to cooling such a molten polymer, and can be used for other fluids as desired.

In addition, as the dispersion body 6, a sintered wire mesh with a gradually larger mesh size at the periphery was used, but this may be increased in stages, or other similar objects such as sintered metal may be used depending on the fluid. In addition, the use of one dispersion body 6 is not limited to a plurality of dispersion bodies 6, and it is sufficiently effective.

It should be noted that it is no longer the case that it is possible to perform not only cooling but also heating of fluids.

Further, the jacket 5 may be formed of a coil or a half-split coil, and the heat medium may be passed in series, or the jacket 5 may be divided into several sections and passed in parallel.

In this example, a sintered wire mesh was used, but a dispersion with a large opening could also be a dispersion in which metal fibers were sintered or not sintered, or a perforated plate. Can be used effectively.

As explained above, according to the present invention, a dispersion element whose mesh size gradually or stepwise becomes larger from the center toward the periphery is provided inside the tube having a heat medium jacket formed on the outside. It has the remarkable effect of being able to effectively heat and cool fluids, especially highly viscous substances and thermoplastic polymers that are sensitive to heat, without creating dead spaces and with small pressure loss.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a view taken along the line A--A in FIG. 1... Pipe body, 2... Mantle tube, 3... Supply nozzle,
4...Discharge nozzle, 5...Jacket, 6...Dispersion element, 10...Holder.

Claims (3)

[Scope of utility model registration request] (1) The outside of the tube is coated with a mantle that has an inlet and outlet for the heat medium, and the inside of the tube is covered with a dispersion whose opening gradually or stepwise increases from the center to the periphery. A fluid heat exchange device characterized by being installed in a direction substantially perpendicular to an axis. (2) Scope of Utility Model Registration Claim 1, characterized in that the dispersion consists of a sintered wire mesh whose mesh size gradually or stepwise increases from the center to the periphery, and a reinforcing wire mesh that holds the same. A heat exchange device for the fluid described. (3) The fluid heat exchange device according to claim 2, wherein the sintered wire mesh and the reinforcing wire mesh are sandwiched at their outer peripheral portions by a rim.