JPS5844306B2 - absorption chiller absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an absorber for an absorption refrigerator or an absorption heat pump.

Conventionally, the idea for absorbers has been to cool them as much as possible and remove a large amount of absorbed heat to enhance the absorption effect of refrigerant gas.

However, in order to effectively utilize the heat generated by the refrigerator,
If part of the absorbed heat is used to reheat the concentrated solution, this will initially result in a reduction in the amount of heating in the generator, and the remainder of the absorbed heat will be used to warm the cooling medium (in this case water). If used, this hot water can be used for heating, improving the efficiency of refrigerators and heat pumps.

The concept of heat recovery itself is well known; for example, as shown in Figure 1, an absorber used in an absorption refrigerator using ammonia uses cooling water and a concentrated solution as fluids to remove absorbed heat in series. There is something.

This allows a dilute solution and refrigerant gas to flow in from a lower port 1, a concentrated solution to be taken out from an upper outlet 2, and cooling water to flow in from a cooling water port 3 located near the upper outlet and to flow out from a cooling water outlet 4.

The concentrated solution coming out of the absorber passes through a pump (not shown) and flows into the absorber again through the inlet 5.

After being reheated, it is sent to the generator through the outlet 6.

However, in this method, since the concentrated solution final outlet 6 is located near the inlet 1 where the high temperature dilute solution flows in, there is no problem in heating the concentrated solution, but since the cooling water outlet 4 and the concentrated solution population 5 are close to each other, In terms of temperature, the concentrated solution temperature is about 10° C. higher than the cooling water temperature, so it is difficult to increase the cooling water outlet temperature.

This is a problem because heat recovery must be done to obtain as high a temperature as possible.

The present invention provides an absorber which eliminates the above-mentioned problems and makes it possible to obtain a high temperature concentrated solution and cooling water.

The details of the present invention will be explained below along with examples.

FIG. 2 shows a triple-pipe meandering absorber according to an embodiment of the present invention, and FIG. 3 shows an enlarged sectional view taken along the line X--X in FIG.

The refrigerant is a fluorocarbon-based refrigerant, and the absorption liquid is an organic solvent.

The dilute solution and the refrigerant gas pass through the central pipe 11 between the central pipe 8 and the inner pipe 7 from the central pipe port 13, gradually becoming a concentrated solution, and flow into the pump (not shown) through the central pipe outlet 14.

The concentrated solution whose pressure has been increased by the pump is made to flow from the inner tube inlet 15 through the inner tubes 7 and 10 in opposition to the dilute solution.
After reheating, it is sent to the generator via the inner tube outlet 16.

The cooling water flows from the outer tube outlet 17 to the outer tube outlet 1, facing the dilute solution as well as the concentrated solution, and passing the inner tube 12 between the outer tube 9 and the central tube 8 to the outer tube outlet 1.
It is supposed to flow towards 8.

Therefore, since the concentrated solution and the cooling water flow in parallel with each other and in opposition to the dilute solution, the required temperature is adjusted according to the process of changing from the dilute solution to the concentrated solution while removing the heat generated by the absorption of the refrigerant gas. Corresponding to the drop, the temperature of the concentrated solution and cooling water increases along with the flow.

That is, at the cold end 19, a concentrated solution having a temperature of about 10° C. plus the temperature of the cooling water flows into the hot end 20 at a high temperature, and without generating absorption heat, a dilute solution flows toward the cold end 19 ( At the cold end, the result is a concentrated solution.Since countercurrent heat exchange is performed, the concentrated solution can be efficiently heated to a high temperature and taken out, and the outlet temperature of the cooling water can also be raised by half.

Of course, there is no problem in passing cooling water into the inner tube 10 and passing a concentrated solution into the outer tube 12.

Fig. 4 shows an outer pipe outlet 18 provided midway through which the cooling water flows out.
The space between the outer tube outlet 17 and the outer tube outlet 181 has a triple tube structure, and from the outer tube outlet 18 to the central tube outlet 13-! This is an absorber with a double tube structure between and.

This is because the amount of absorption heat generated is small in the high temperature section, and the efficiency of the system increases as the temperature of the concentrated solution increases, so it is desirable to heat the concentrated solution to as high a temperature as possible.

Therefore, it is advantageous not to release the heat absorbed in the high temperature part to the water.

Figure 5 shows the concentrated solution and cooling water outlet temperature with respect to the dilute solution flow rate for an example of a full triple tube type absorber, and Figure 6 shows the following:
1 shows an example of a triple-pipe absorber including some double-pipe absorbers.

A is the temperature of the artificial dilute solution in the absorber, B is the temperature of the concentrated solution at the outlet of the absorber sent to the generator, C is the temperature at the outlet of the cooling water, and D is the temperature of the concentrated solution at the outlet of the absorber sent to the pump (when conventional heat recovery is not performed). (also the concentrated solution temperature), E indicates the cooling water inlet temperature.

As is clear from this figure, it is possible to take out both the concentrated solution and the cooling water at high temperatures.

In particular, for Fig. 6, the concentrated solution is heated with a difference of 10°C from the dilute solution temperature, which is the maximum temperature of the absorber, which greatly reduces the heating amount of the generator and also reduces the cooling water temperature. 50℃
, so it can be used for heating.

Furthermore, if the required number of absorbers of the present invention are arranged according to the refrigerating capacity, each absorber will be heated individually, so a stable temperature state can be easily obtained regardless of the capacity.

Furthermore, since the structure is made up of three meandering tubes, it has the advantage of being easily and inexpensively manufactured.

As described above, the present invention uses a triple tube to flow the concentrated solution and cooling water in parallel, and the dilute solution in opposition, so part of the absorbed heat is used to reheat the concentrated solution, and the rest is used to reheat the concentrated solution. It can be effectively used to heat cooling water, producing a high temperature concentrated solution and cooling water.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an absorber according to an embodiment of the conventional technology, FIG. 2 is a schematic diagram of an absorber according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of the pipe shown in FIG. 2. , FIG. 4 is a schematic configuration diagram of an absorber according to a different embodiment of the present invention in which a portion of the absorber is double piped, FIG. 5 is a diagram showing the temperature distribution state in the absorber of FIG. 2, and FIG.
It is a figure which shows the temperature state which a button of the absorber of a figure is turned on. 7...Inner pipe, 8...Central pipe, 9...
...Outer pipe, 13...Central pipe inlet, 14...
...Central pipe outlet, 15...Inner pipe inlet, 16.
...Inner pipe outlet, 17...Outer pipe inlet, 18
...Outer tube outlet.

Claims (1)

[Claims] 1. A triple-pipe structure including an inner pipe on the inside, a central pipe on the outside of the inner pipe, and an outer pipe on the outside of the inner pipe in a cross section perpendicular to the flow direction of the fluid. A dilute solution and a refrigerant gas are flowed from the center pipe at one end, a cooling medium is flowed into the outer pipe when a concentrated solution is flowed into the inner pipe, and a concentrated solution is flowed into the center pipe when a cooling medium is flowed into the inner pipe. An absorber for an absorption refrigerator characterized by having a structure in which the fluid flows in opposition to the fluid in the pipe. 2. In claim 1, the outer tube of the triple tube section is shortened to have a partially double tube structure, and the dilute solution and refrigerant gas are inserted into the central tube at the end of the double tube section. An absorber for an absorption refrigerator, characterized in that the structure is such that a concentrated solution is allowed to flow in the inner tube at an end of a triple tube portion, and a cooling medium is allowed to flow in an outer tube in opposition to the fluid in the central tube.