JPS5933963Y2 - Absorption chiller regenerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a regenerator for an absorption refrigerator that includes a heat transfer tube through which hot water or steam, which is the driving heat source of the absorption refrigerator, passes.

Fig. 1 shows the case of conventional hot water or steam drive, and Fig. 2 shows the case of direct heating.

The regenerator of a conventional absorption refrigerator is shown in Figures 1 and 2.
, I'b, when the heating heat exchanger tube 14' is in the solution 16'
It was a so-called flooded type.

However, in such a flooded type, a pressure difference (solution head difference) occurs between the deep liquid part and the shallow liquid part of the heat transfer tube 14', and the boiling temperature of the solution increases in the deep liquid part, causing heat loss. Not only is the transmission poor, but a lot of filling fluid has been required.

In the case of direct firing (kerosene, heavy oil, gas) as shown in Figure 2, there is not much effect, but in the case of hot water or steam drive as shown in Figure 1, if the deep liquid part cannot be superheated to a high degree, It becomes subcooled and the heat transfer coefficient worsens.

In Figures 1 and 2, 15' is a solution inlet pipe, 17'
18' is a solution outlet pipe, 19' is a steam outlet pipe, and 20' is a combustion chamber.

In addition, the low pressure regenerator 2 of the dual effect absorption refrigerator shown in FIG.
If the spray type (indicated by 13') is used, as in 13', the solution often falls without touching the heat exchanger tube 12', and the lower temperature and higher temperature heat exchangers 7' and 6' are connected to the solution pump 9'. If only the solution is supplied through the heat exchanger tube 12', the wettability of the solution on the heat exchanger tube 12' decreases, resulting in a decrease in heat exchange efficiency.

In Fig. 3, 1' is a high-pressure regenerator, 3' is a condenser, 4' is an evaporator, 5' is an absorber, 8' is a separator, and 10' is a high-pressure regenerator.
' is a solution trap, and 11' is a refrigerant trap.

This invention significantly reduces the amount of solution filled in the regenerator (and increases the heat transfer coefficient to 2 to 4 times that of the conventional flooded type).
The purpose of reducing the heat transfer area is to pass hot water or steam, which is the driving heat source of the absorption chiller, through a heat transfer tube and spray the solution onto the heat transfer tube. Use a device to recirculate the solution (・
By spraying the heat exchanger repeatedly, a sufficient liquid film is formed on the entire surface of the heat transfer tube and evaporated into a film. , which is used in dual-effect absorption refrigerators.

The present invention will be explained based on the embodiment (-heavy-effect machine) shown in FIG.

A solution spray device 24 is provided on the heating heat transfer tube 14 (through which hot water or steam, which is the driving heat source of the absorption refrigerator, passes as a heating source) in the regenerator 1. A solution (solution sent by a solution pump) is sprayed on the heat exchanger tube 14, forming a liquid film on the heat exchanger tube 14, and heat exchange inside and outside the heat exchanger tube (by hot water or steam flowing inside and the solution sprayed outside). Heat exchange) takes place, and the solution outside the heat transfer tube 14 boils, releases the refrigerant, becomes a thick solution, accumulates at the bottom of the regenerator 1 as shown at 16a, and exits through the solution outlet tube 18.

19 is a steam outlet pipe. On the other hand, the solution 16a accumulated at the bottom of the regenerator 1 passes through the solution return pipe 26 to the solution recirculation device 2.
5 (this is something like an ejector and is installed in the pipe that sends the solution to the solution spray device 24 by a pump), which causes the solution to be repeatedly sprayed onto the heat transfer tube 14 again, and by this repeated solution spraying, Heat exchanger tube 14
The solution is spread over the entire surface of the substrate, forming a liquid film over the entire surface to make the wetting rate uniform.

As mentioned earlier, in the conventional flooded type (as shown in Figures 1 and 2), there is a pressure difference between the deep liquid part and the shallow liquid part of the heat transfer tube 14', and the regenerator Since the pressure within 1'a1'b is lower than the atmospheric pressure, there is a large difference in the boiling temperature of the solution between the deep liquid part and the shallow liquid part.

As a result, the boiling temperature of the solution in the deep liquid region rose, which not only caused poor heat transfer (but also required a large amount of solution).

In addition, with the spray set as shown in Fig. 3, the solution from the regenerator (high pressure) 1' is scattered by the solution spray device 13', and many of the solutions fall as they are without touching the heat transfer tubes 12'. If only the solution from the regenerator 1' is used, the heat exchanger tube 12
However, in the present invention, as explained in the above embodiment, hot water or steam, which is the driving heat source of the absorption refrigerator, is The solution is introduced into the heating heat transfer tube 14, and the solution is sprayed onto the heat transfer tube by a solution spraying device 24 to form a liquid film, and the solution 16a that has been sprayed and dropped by the solution spraying device is recirculated by a device 25. The solution is repeatedly circulated through the solution spraying device 24 again to spread the solution over the entire surface of the heat exchanger tube 14 to form a liquid film over the entire surface and make the wetting rate uniform, so that the entire surface of the heat exchanger tube 14 is circulated repeatedly. is placed under uniform pressure, which significantly improves heat exchange inside and outside the heat transfer tube, promoting evaporation of the solution and eliminating evaporation inhibition caused by the pressure difference between the deep liquid part and the shallow liquid part of conventional heat transfer tubes. Therefore, not only the rise time at startup is shortened, but also the heat transfer area can be reduced, making it possible to downsize the absorption refrigerator.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams of conventional regenerators for absorption refrigerators, that is, flooded type regenerators in which heat transfer tubes are immersed in a solution. Shows the case of direct firing. FIG. 3 is a circuit diagram of a conventional dual-effect absorption refrigerator, in which a spray set is used to spray the solution from the high-pressure regenerator onto heat transfer tubes within the low-pressure regenerator. FIG. 4 is a schematic diagram of an embodiment of the regenerator according to the present invention. In Fig. 4, 1... regenerator, 14...
... Heat exchanger tube, 24 ... Solution spray device, 25
...Solution recirculation device, 26...Solution return pipe, 16a...Solution accumulated at the bottom of the regenerator,
18... Solution outlet pipe, 19... Steam outlet pipe.

Claims (1)

[Scope of utility model registration request] In a regenerator that has a solution spraying device that sprays a solution onto a heat transfer tube that introduces hot water or steam that is a driving heat source for an absorption chiller, the solution that has been sprayed by the spraying device and falls is repeatedly recirculated to the spraying device. A regenerator for an absorption refrigerator, characterized in that it is equipped with a device.