JPS6011799B2 - direct contact heat exchanger - Google Patents

Description

[Detailed description of the invention] The present invention relates to a direct contact heat exchanger.

Direct contact heat exchangers, which exchange heat by bringing liquids into direct contact with liquids or liquids with gas, have an extremely large heat exchange capacity per unit volume. Due to the large size, a large area for ritual preparation is required.
It is expected that it will be used in fields such as geothermal power generation and scarlet heat recovery, which have been obstacles in the design.

An example of a subordinate structure of a direct contact heat exchanger is shown in FIG.

In the figure, reference numeral 1 indicates a casing of a heat exchanger, and an introduction pipe 2 is provided above the side surface of the casing, from which a liquid 3 as a primary fluid is introduced. A distributor 4 is disposed below inside the casing 1, and another fluid 6, which is a secondary fluid, is supplied to the distributor 4 through an introduction pipe 5 provided through the casing 1. Kamasha is destroyed.

There are various structures for the disperser 4, but since there is no need to specifically limit the structure here, a porous cylindrical structure is exemplified. Further, a discharge pipe 7 is provided at the bottom of the casing 1, and the liquid 3 that has undergone heat exchange is discharged. In addition, a gas exhaust port 9 is provided at the upper end of the casing 1.
is provided. Based on the structure described above, this heat exchanger operates as follows.

That is, a high-temperature primary fluid 3 is introduced into the casing 1 through the introduction pipe 2, and a low-temperature gaseous secondary fluid 6 is sent into the disperser 4 through the introduction pipe 5. 6 becomes minute bubbles and is dispersed in 3 by 4, and after exchanging heat through direct contact, is discharged from the gas discharge port 9 as exhaust gas 10.

The primary fluid that has undergone heat exchange is discharged from the discharge pipe 7 through the liquid 8
It is discharged as. Further, when this device is used as a direct contact evaporator, the secondary fluid 6 is in a liquid state until it leaves the disperser 4, and is evaporated and vaporized into bubbles by heat exchange with the primary fluid 3, and the subsequent operation is as described above. It will be similar. Incidentally, the degree of flow and concentration within the casing varies depending on the type of the disperser 4, the flow rate of the fluid, etc., but generally the action of the sea bream azusa is quite severe and affects the entire liquid phase within the casing 1.

For this reason, entrainment of air bubbles into the discharged liquid 8 is inevitable.In particular, the higher the performance of the disperser, the better the contact efficiency, so the flow rate of the primary fluid increases, and the air bubbles are discharged from the discharge pipe 7. is a non-negligible amount. If air bubbles are mixed into the discharged primary fluid in this way, the amount of steam generated will decrease when the heat exchanger is used as an evaporator, which not only directly affects efficiency but also reduces the amount of discharged liquid. This is not preferable because it causes a decrease in the efficiency of the discharge pump etc. in No. 8.

In order to overcome these drawbacks, a heat exchanger having a structure as shown in FIG. 2 has been proposed.

This improved type is provided with a static pupil tank 11 connected to the discharge pipe 7 alongside the casing 1, and the upper end of the static pupil tank 11 is connected to the upper end of the casing by a pipe 12.
A discharge port 13 is provided at the lower end. If such a structure is adopted, the flow of liquid in the static pupil tank 11 is not as strong as in the casing 1, so air bubbles are easily separated from the liquid due to the difference in specific gravity, and flow through the piping 12 into the casing 1. The gas is returned to the upper space of the gas 10, and is recovered by merging with the gas 10.

If such a structure is adopted, it is possible to separate air bubbles, but as a heat exchanger, it is important to reduce the outer surface area as much as possible in order to reduce heat radiation. Providing the tank 11 is not preferable and increases the overall size.

Also, if this heat exchanger is for high pressure steam generation,
The still tank 11 must also be designed and manufactured as a high-pressure container, which increases manufacturing costs. The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional heat exchanger, and provides a direct contact type heat exchanger that is small in size, causes little heat radiation, and is capable of reliably separating air bubbles. It is. Hereinafter, details of the present invention will be explained in conjunction with embodiments shown in the drawings.

FIG. 3 is for explaining one embodiment of the present invention.
The same parts as those in FIG. 2 are designated by the same reference numerals.

In this embodiment, a partition plate 14 is provided at the bottom of the casing 1.
By providing this, a sub-casing 15 is formed at the lower part of the casing 1. The partition wall 14 is provided with a passage pipe 16 that allows the casing 1 and the sub-casing 15 to pass through each other, and a liquid discharge port 17 is provided at the lower end of the sub-casing 15. A gas rising pipe 18 is installed as a shield from the partition crab 14, and its lower end passes through the upper end of the sub-casing 15, and its upper end communicates with the upper space of the casing 1. Since this embodiment is configured as described above, the discharged liquid 8
The air enters the sub casing 15 from the transfer pipe 16 over the partition wall 14 with air bubbles. Since the inside of the sub casing 15 is partitioned from the casing 1 by the partition wall 14, the flow of liquid inside the casing 1 is blocked, so air bubbles entering the sub casing 15 are easily trapped due to the difference in specific gravity. The liquid is reliably separated and is discharged from the discharge pipe 17 as the liquid 8 without containing bubbles. On the other hand, the separated gas is guided to the upper space of the casing 1 through the gas riser pipe 18, where it joins with the gas 10 that has completed heat exchange within the casing, and is recovered and discharged from the outlet 9.

When such a structure is adopted, since the sub casing 15 is integrated with the main casing 1, the surface area of the entire device is reduced, and the amount of heat radiation can be reduced.

Further, since the left force on both the upper and lower sides of the partition wall 14 is approximately equal, even if the inner left side in the casing is high, there is no need to make it particularly thick and strong. FIG. 4 explains another embodiment of the present invention, and in this embodiment, a buckle plate 19 is provided below the speed transport tube 16.

Therefore, the liquid containing air bubbles coming out of the transport tube 16 hits this buckle plate 19 and is dispersed in the horizontal direction, making it easier for the air bubbles to separate.

As a result, the height of the sub-casing 15 can be reduced by 4 mm, and the entire heat exchanger can be made more compact. Furthermore, FIG. 5 shows another embodiment.

In this case, the outlet on the sub-casing side of the lotus pipe 16 leading from the main casing 1 to the sub-casing 15 is bent so as to face in the tangential direction of the cylinder of the casing, as shown in FIGS. 6 and 7. Therefore, the liquid flowing into the sub-casing makes a swirling motion. When performing such a turning movement,
Since the liquid and the bubbles entrained therein are subjected to centrifugal force, a centrifugal separation effect works, and the bubbles, which have a smaller specific gravity than the liquid, are separated in the direction of the central axis of swirl. Therefore, when the lower end of the gas rising pipe 18 is connected to the upper center of the sub casing, the separated air bubbles are collected in the upper space of the main casing. In addition, the take-out pipe 17 for the liquid from which bubbles have been separated is attached tangentially to the side wall of the sub-casing, and in this way, the liquid flows smoothly into the take-out pipe while swirling, reducing pressure loss and once separated. It is also possible to prevent air bubbles from being re-entrained.

In this way, by allowing the liquid that has undergone heat exchange to flow into the sub-casing to create a swirling flow, centrifugal force can be used to separate bubbles within the sub-casing, further increasing the separation effect. be able to.

As is clear from the above description, according to the present invention, a sub-casing partitioned by a partition wall is provided below the casing, and both casings are speed-selected by a lotus pipe.
Since the partition wall is equipped with a gas riser pipe that guides the separated gas into the upper space of the casing, it is possible to reliably separate the gas and liquid after heat exchange, and the heat dissipation area is also reduced. A small and overall compact direct contact heat exchanger can be obtained.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal side views explaining different conventional structures, and FIGS. 3 and 4 are longitudinal side views explaining different embodiments of the present invention. FIG. 5 is a longitudinal side view explaining different embodiments of the present invention. Further, a vertical cross-sectional view of another embodiment, FIG. 6 is taken from A- in FIG.
A sectional view and FIG. 7 are BB sectional views of FIG. 5. 1...Casing, 2...Introduction part, 3, 8
...Liquid, 4...Distributor, 6...
...Fluid, 9...Discharge port, 10...Gas, 14...Partition wall, 15...Sub-casing, 16...Horitsu pipe, 17...Exhaust pipe, 18...
...Gas riser pipe, 19...Buckle plate. Figure 7 Pseudo-Z diagram Figure 3 Figure 4 Hatred diagram

Claims (1)

[Claims] 1. A disperser is disposed in the liquid introduced into the casing,
In a direct contact heat exchanger that disperses gas as bubbles in a liquid from this disperser or disperses the liquid and evaporates it, a sub-casing partitioned by a partition wall is provided at the lower part of the casing, and the partition wall is A direct contact heat exchanger equipped with a communication pipe that communicates the casing and the sub-casing, and a gas riser pipe whose lower end communicates with the upper end of the sub-casing and whose upper end communicates with the space above the casing. 2. The direct contact heat exchanger according to claim 1, characterized in that a buckle plate is provided below the communication pipe in the sub-casing. 3 The main casing and the sub casing are connected by a communication pipe, and the outlet of the communication pipe is bent in the tangential direction of the cylinder of the casing, so that the liquid flowing from the main casing to the sub casing through the communication pipe is transferred into the sub casing. 2. The direct contact heat exchanger according to claim 1, wherein the direct contact heat exchanger is made to flow in a direction such that it makes a swirling motion, thereby facilitating the separation of air bubbles by the centrifugal separation effect caused by the swirling.