JPH0340308B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention involves flowing a solution for mass exchange around the outer periphery of a heat transfer tube, causing the solution to absorb steam to generate heat, and passing this heat through the heat transfer tube. The present invention relates to a mass transfer heat exchange device for transferring heat to a fluid.

[Conventional technology]

An example of a conventional device of this type is shown in FIG. In the figure, 1 is the housing, 2 is the housing 1
3 is a dispersion toy for storing the concentrated solution 10 to be used for mass exchange; 4 is a dispersion port provided at the bottom of the dispersion toy 3; 5 is a diluted solution for taking out the dilute solution 11 after mass exchange. Outlet tube, 6 is concentrated solution 10
7 is a steam introduction pipe that introduces steam 12 into the housing 1, 8 is a pump, and 9 is a dilute solution take-out pipe.

Next, the operation will be explained. A concentrated solution 10 flowing from a concentrated solution inlet pipe 6 provided in the housing 1 is collected in a spraying toy 3 and is sprayed onto the heat transfer tube 2 from a spraying port 4 provided at the lower part of the spraying toy 3. The sprayed concentrated solution 10 absorbs the steam 12 introduced from the steam introduction tube 7 while flowing down the outer peripheral surface of the heat transfer tube 2, and becomes a dilute solution 11 with heat generation. This steam 1
The heat generated when 2 is absorbed into the concentrated solution 10 is
The heat is transferred through the heat transfer tube 2 to the fluid inside the tube. On the other hand, the solution 11 that has absorbed the vapor 12 is taken out from the dilute solution outlet pipe 5 to the outside of the apparatus via the dilute solution take-out pipe 9 by the pump 8.

[Problem to be solved by the invention]

Since the conventional mass transfer heat exchange device is configured as described above, when the horizontally arranged heat transfer tubes 2 are long in the axial direction, the concentrated solution 1 sprayed from the spray port 4
It is difficult to uniformly wet the outer peripheral surface of the heat exchanger tube 2 at 0, and this tendency is particularly noticeable in the lower heat exchanger tube 2. Furthermore, when the heat exchanger tubes 2 are arranged horizontally as described above, a large number of spray ports 4 are required, making it difficult to uniformly distribute the concentrated solution 10. Furthermore, when the housing 1 is installed at an angle, the concentrated solution 10 is not evenly spread over the outer circumferential surface of the heat exchanger tube 2, as shown in FIG. Further, when the amount of the concentrated solution 10 introduced from the concentrated solution introduction pipe 6 fluctuates due to disturbances such as load fluctuations, it is not possible to ensure a constant flow rate of the concentrated solution 10 sprayed from the spray port 4. That is, the concentrated solution 10 introduced from the concentrated solution introduction pipe 6
The amount of the concentrated solution 10 sprayed from the spraying port 4 was larger than that of the spray opening 4, which sometimes caused the concentrated solution 10 to run out. Conversely, if the amount of the concentrated solution 10 introduced from the concentrated solution introduction pipe 6 increases, as a result, an excess of the concentrated solution 10 flows over the heat transfer tube 2, and more refrigerant vapor is absorbed than necessary, resulting in optimal mass transfer characteristics. There were some things I couldn't get.

As mentioned above, conventional mass transfer heat exchange equipment
There was a problem in that stable heat and mass transfer characteristics could not be obtained due to the influence of external factors such as the inclination of the heat exchanger housing and load fluctuations.

This invention was made to solve the above-mentioned problems, and it is possible to always obtain stable heat and mass transfer characteristics without being affected by external factors such as the tilt of the heat exchanger housing or load fluctuations. The purpose is to provide a highly reliable mass transfer heat exchange device.

[Means for solving problems]

The mass transfer heat exchange device according to the present invention includes a casing that houses upright heat transfer tubes, a partition plate through which the heat transfer tubes penetrate through a gap and divides the casing into an upper chamber and a lower chamber, and a partition plate that divides the casing into an upper chamber and a lower chamber, A concentrated solution introduction pipe that introduces the concentrated solution into the upper chamber, a pump that leads out the dilute solution after substance exchange from the lower chamber and introduces a part of it into the upper chamber, and communicates with the upper chamber and the lower chamber. The intermediate concentration solution in the upper chamber is a mixture of the dilute solution and the concentrated solution left in the upper chamber. The solution is made to flow down along the heat exchanger tube from the gap between the upper air partition plate and the heat exchanger tube, absorbing steam as it flows down to generate heat, and transmitting the heat to the fluid in the heat exchanger tube.

[Effect]

In this invention, since the intermediate concentration solution flows down the outer peripheral surface of the upright heat exchanger tube, there is little effect even if the housing is slightly tilted, and the intermediate concentration solution flows down along the entire outer peripheral surface of the heat exchanger tube. do. In addition, since a part of the dilute solution in the lower chamber is introduced from the lower chamber to the upper chamber via the pump, the amount of the intermediate concentration solution in the upper chamber is smaller than that of the concentrated solution introduced into the upper chamber by the concentrated solution introduction pipe. It does not depend only on quantity. Furthermore, since the return tube equalizes the pressure between the upper chamber and the lower chamber and eliminates the vapor pressure difference, the flow rate of the intermediate concentration solution flowing down from the gap between the partition plate and the heat exchanger tube along the heat exchanger tube is lower than that of the intermediate concentration solution in the upper chamber. is determined by the amount of water (liquid level height). Further, even if the amount (liquid level height) of the intermediate concentration solution in the upper chamber increases for some reason, the return pipe guides a portion of it to the lower chamber.

〔Example〕

FIG. 4 is a block diagram showing a mass transfer heat exchange device according to an embodiment of the present invention. In the figure, 2 is an upright heat exchanger tube, 13 is a partition plate that divides the inside of the housing 1 into an upper chamber 1a and a lower chamber 1b, and the heat exchanger tube 2 passes through the partition plate 13 with a gap 17 in between. In addition,
In this case, the gap 17 is provided around the entire circumference of the heat exchanger tube 2. 6 is a concentrated solution introduction tube that introduces the concentrated solution 10 into the upper chamber 1a. Further, the lower chamber 1b is provided with a dilute solution outlet pipe 5 at the lower part thereof, which leads out the dilute solution 11, and the dilute solution outlet pipe 5 is connected to the dilute solution take-out pipe 9 and the dilute solution inlet pipe 14 via the pump 8. The other end of the dilute solution introduction pipe 14 is connected to the upper chamber 1a. A steam introduction pipe 12 for introducing steam 12 is provided in the lower chamber 1b. A return pipe 15 communicates the upper chamber 1a and the lower chamber 1b, and guides an intermediate concentration solution 16, which is a mixture of the dilute solution 11 and the concentrated solution 10, which are surplus in the upper chamber 1a, to the lower chamber 1b. Arrows in the figure indicate the direction of fluid flow.

Next, the operation will be explained. The concentrated solution 10 introduced through the concentrated solution introduction pipe 6 enters the upper chamber 1a and accumulates on the partition plate 13. The dilute solution 11 introduced by the pump 8 through the dilute solution introduction pipe 14 is also collected in the upper chamber 1a, and the upper chamber 1a becomes an intermediate concentration solution 16 in which the concentrated solution 10 and the dilute solution 11 are mixed. There is. The intermediate concentration solution 16 flows down from the gap 17 between the partition plate 13 and the heat exchanger tube 2 to the outer peripheral surface of the heat exchanger tube 2,
It absorbs the steam 12 flowing in through the steam introduction pipe 7, generates heat, and becomes a dilute solution 11. The heat generated when the steam 12 is absorbed is transferred via the heat transfer tube 2 to the fluid in the tube. On the other hand, the solution 11 that has absorbed the vapor 12
is distributed from the dilute solution outlet tube 5 via the pump 8 to the dilute solution outlet tube 9 and the dilute solution inlet tube 14 in a one-to-one ratio, for example. Although not shown in FIG. 3, in general, the dilute solution 11 exiting the dilute solution take-out pipe 9 is regenerated by a regenerator to become a concentrated solution 10 and introduced into the concentrated solution inlet pipe 6 again. Further, the solution flowing through the dilute solution introduction pipe 14 flows into the upper chamber 1a.

In the mass transfer heat exchange device configured as described above, since the heat exchanger tubes 2 are formed vertically, the flowing liquid can easily flow uniformly on the outer peripheral surface of the heat exchanger tubes 2.
Since more efficient mass transfer is performed on the heat exchanger tube 2 than in the conventional type, the performance is improved, and as a result, it is possible to downsize the device. In addition, even if the housing 1 is slightly tilted, the intermediate concentration solution 16 flows down the outer circumferential surface of the upright heat transfer tube 2.
The influence is small, and there is no possibility that the heat exchanger tubes 2 will not get wet as in the conventional device.

In addition, when the amount of solution flowing into the upper chamber 1a is close to the rated value, the return pipe 15 is connected to the upper chamber 1a and the lower chamber 1b.
The flow rate of the intermediate concentration solution 16 flowing along the heat transfer tube 2 through the gap 17 depends only on the liquid level height of the solution on the partition plate 13 and the dimensions of the gap 17. do. Therefore, by stabilizing the liquid level of the solution on the partition plate 13, the flow rate of the intermediate concentration solution 16 flowing along the heat transfer tube 2 can be stabilized.

Here, if the amount of the concentrated solution 10 flowing into the upper chamber 1a from the concentrated solution introduction pipe 6 or the amount of the dilute solution 11 from the dilute solution introduction pipe 14 increases significantly from the rated value, the liquid level on the partition plate 13 rises. It turns out. In this case, the return pipe 15 functions to equalize the pressure and to overflow excess solution into the lower chamber 1b. At this time, the overflowing solution flows along the inner wall of the return pipe 15. Thereby, it is possible to prevent the pump 8 from running idle due to a decrease in the amount of solution in the lower chamber 1b. Further, the intermediate concentration solution 16 that does not overflow flows through the heat exchanger tube 2 through the gap 17 at a stable flow rate and performs an absorption heat generation operation.

Furthermore, since half of the falling amount of the solution used for substance exchange is returned through the dilute solution introduction pipe 14 by the pump 8, there is less fear of running out of the solution.

From the above, in the mass transfer heat exchange device according to the present invention, the amount of solution (liquid level height) on the partition plate 13 can be maintained within a predetermined range, and as a result,
The flow rate of the intermediate concentration solution 16 flowing along the heat exchanger tube 2 can be stabilized, and stable heat mass transfer characteristics can always be obtained.

Next, another embodiment of the present invention will be described using FIG. 4. FIG. 4 is a configuration diagram showing another embodiment of the heat exchanger tube portion in the apparatus shown in FIG. 3. In the figure, reference numeral 18 indicates a needle-like or tooth-like fin, which is formed by winding the tip of the fin around the outer circumferential surface of the heat transfer tube 2 with its tip facing upward from the horizontal direction, or by cutting and bending the fin. With this configuration, mass transfer is promoted by increasing the heat transfer area and making it easier for the flowing liquid to uniformly wet the outer peripheral surface of the heat transfer tube 2 due to the effect of the fins 18, and the fins 18 reduce the flow path resistance. As a result, the velocity of the flowing liquid decreases, the mass transfer time becomes longer, and vapor is better absorbed. It goes without saying that even if the housing 1 is tilted, the outer circumferential surface of the heat transfer tube 2 will be uniformly wetted due to the liquid holding power of the fins 18, and the characteristics will be the same as when the housing is vertical.

〔Effect of the invention〕

In this invention, a casing that houses an upright heat transfer tube, a partition plate through which the heat transfer tube penetrates through a gap and divides the casing into an upper chamber and a lower chamber, and a concentrated solution before mass exchange is introduced into the upper chamber. A concentrated solution inlet pipe, a pump that leads out the dilute solution after substance exchange from the lower chamber and introduces a part of it into the upper chamber, and a pump that communicates with the upper and lower chambers to remove the excess dilute solution in the upper chamber. Equipped with a return tube that sends an intermediate concentration solution mixed with a concentrated solution to the lower chamber, and a steam introduction tube that introduces steam to the lower chamber, the intermediate concentration solution in the upper chamber is passed through the gap between the partition plate and the heat exchanger tube into the heat exchanger tube. The system absorbs steam as it flows down, generates heat, and transfers that heat to the fluid in the heat exchanger tube, thereby eliminating the influence of external factors such as the tilt of the heat exchanger housing and load fluctuations. A highly reliable mass transfer heat exchange device that can always obtain stable heat and mass transfer characteristics without being subjected to any damage can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional mass transfer heat exchange device, Fig. 2 is a block diagram showing the state of heat transfer tubes and flowing liquid when the housing is tilted in the device shown in Fig. 1, and Fig. 3 is a block diagram showing an example of a conventional mass transfer heat exchange device. This figure is a block diagram showing a mass transfer heat exchange device according to one embodiment of the present invention, and FIG. 4 is a block diagram showing another embodiment of the heat exchanger tube portion in the device shown in FIG. 3 in an enlarged manner. In the figure, 1 is a housing, 1a is an upper chamber, 1b is a lower chamber, 2 is a heat transfer tube, 6 is a concentrated solution introduction tube, 7 is a steam introduction tube, 8 is a pump, 10 is a concentrated solution, 11 is a diluted solution, 12 is steam, 13 is a partition plate, 15 is a return pipe,
16 is an intermediate concentration solution, and 17 is a gap. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A casing for storing an upright heat transfer tube, a partition plate through which the heat transfer tube passes through a gap and divides the casing into an upper chamber and a lower chamber, and a partition plate for storing a concentrated solution before mass exchange. A concentrated solution inlet pipe is introduced into the upper chamber, a pump which leads out the dilute solution after substance exchange from the lower chamber and introduces a part of it into the upper chamber, and a pump which communicates with the upper and lower chambers and connects the upper chamber to the upper chamber. A return pipe is provided to send an intermediate concentration solution, which is a mixture of a dilute solution and a concentrated solution left over from the above, to the lower chamber, and a steam introduction pipe is provided to introduce steam into the lower chamber, and the intermediate concentration solution in the upper chamber is separated from the above partition. A mass transfer heat exchange device that allows steam to flow down from the gap between a plate and a heat exchanger tube along the heat exchanger tube, absorbs steam as it flows down, generates heat, and transfers the heat to the fluid in the heat exchanger tube. 2. The mass transfer heat exchange device according to claim 1, wherein the upright heat transfer tube has a plurality of needle-like or tooth-like fins fixed to the outer circumferential surface thereof in an upwardly inclined manner.