JPH0330771Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is applied to the upstream side of an absorber that absorbs working fluid into a dilute solution in a pipe in an absorption solution cycle system such as an absorption refrigerator or a concentration difference engine. The present invention relates to an improvement in a gas-liquid mixer arranged to mix a working fluid and a dilute solution leading to an absorber.

(Prior Art) Generally, this type of absorption solution cycle system
As shown in Figure 2, there are a generator 1 that heats a concentrated solution to generate a high-pressure gaseous working fluid, and an absorber 2 that cools a dilute solution and absorbs the gaseous working fluid into the dilute solution. , a solution heat exchanger 11 for exchanging heat between a high-temperature dilute solution after generating the working fluid and a low-temperature concentrated solution after absorbing the working fluid; and a solution pump 7 for circulating the solution between the two. In the case of an absorption refrigerating machine, as shown in Figure a, the generator 1
The high-pressure gas working fluid is condensed in a condenser 8, reduced in pressure by an expansion valve 9 (pressure reduction mechanism), and then evaporated in an evaporator 10 to obtain refrigerating capacity. As shown in FIG. b, the turbine 30 is driven by the pressure of the high-pressure working fluid to obtain output.

By the way, when the absorber 2 in such an absorption solution cycle system is an in-tube absorption type in which the working fluid is absorbed into the dilute solution inside the tube, the dilute solution tube on the upstream side of the absorber 2 is used. It is necessary to dispose a gas-liquid mixer in the pipe, and use the gas-liquid mixer to sufficiently mix the working fluid and the dilute solution before reaching the absorber 2 to promote absorption within the pipe in the absorber 2.

As the above-mentioned gas-liquid mixer, one that utilizes the ejector principle is well known, for example, as disclosed in Japanese Patent Laid-Open No. 56-108070. That is, in this ejector type, as shown in FIG. 11, for example, the dilute solution is ejected from small holes a ₁ and a ₂ provided in the dilute solution inlet pipe a toward the opening of the outlet pipe b. The working fluid from the working fluid inlet pipe c is sucked by the jet of the dilute solution and sent into the outlet pipe b, thereby mixing the working fluid and the dilute solution.

However, in this conventional method, in order to effectively suck the working fluid with a jet of dilute solution, the dilute solution must be jetted at a large speed from the small holes a ₁ and a ₁ , and the small holes a It is necessary to reduce the opening area of ₁ and a ₁ , which increases the passage resistance at the dilute solution inlet pipe a, that is, the flow resistance of the entire gas-liquid mixer, and prevents a sufficient amount of gas-liquid mixed flow to the absorber. becomes difficult to flow,
A drawback was that the amount of working fluid absorbed by the absorber was suppressed to a low level.

(Purpose of the invention) The present invention was made in view of the above points, and its purpose is to roughly mix the working fluid and the dilute solution in advance to a rough mixing state, and to mix the rough gas-liquid mixture. By creating a dense gas-liquid mixed flow through the stirring action using flow collisions, the working fluid and dilute solution can be sufficiently mixed, while the dilute solution side The purpose is to keep the passage resistance low and increase the gas-liquid mixing flow rate to the absorber.

(Structure of the invention) In order to achieve the above object, the structure of the invention is as follows:
In an absorption solution cycle system, an absorber absorbs working fluid into a dilute solution in a pipe, and an absorber heat exchanger cools and roughly mixes the working fluid and dilute solution by a concentrated solution flowing from the absorber to a generator. The gas-liquid mixer is installed in the dilute solution pipe between the cylinders and is connected to the side of the vertical closed cylindrical cylinder, which mixes the working fluid and dilute solution sent out from the absorber heat exchanger. An inlet pipe that introduces a crude gas-liquid mixed flow into the shell, and an inlet pipe that stands upright in the shell with the upper end opening facing the upper space inside the shell, and a number of small holes are formed on the side. It is equipped with a plurality of outlet pipes for discharging the gas-liquid mixed flow inside the shell to the outside.

As a result, the working fluid contained in a part of the crude gas-liquid mixed flow introduced into the shell from the inlet pipe is temporarily stored in the upper space of the shell, and then flows into each outlet pipe from the upper end opening. At the same time, the remaining crude gas-liquid mixed flow is divided into small pieces through a large number of small holes and flows into each outlet pipe, so that the working fluid descending in the outlet pipe and the crude gas-liquid mixed flow flowing into the outlet pipe from the small holes are combined. The working fluid and the dilute solution are mixed intimately by creating an agitating action by perpendicular collision with the dilute solution, and then
This dense gas-liquid mixed flow is sent to an in-tube absorption type absorber.

(Effect of the invention) Therefore, according to the gas-liquid mixer of the absorption solution cycle system of the invention, part of the working fluid of the crude gas-liquid mixed flow that has flowed into the body from the inlet pipe is allowed to flow down inside each outlet pipe. The remaining crude gas-liquid mixed flow was divided into small pieces from each small hole and flowed into each outlet pipe, and the working fluid collided with the flowing working fluid from the side to mix the working fluid and the dilute solution. Therefore, the working fluid and the dilute solution are sufficiently mixed by the stirring action that occurs when they collide, while reducing the passage resistance on the dilute solution side to reduce the gas-liquid mixed flow rate to the absorber. It is possible to increase the absorption of the working fluid in the absorber of the absorption solution cycle system.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows the overall configuration of an absorption refrigerator according to an embodiment of the present invention, in which 1 is a generator that heats a concentrated solution using a built-in heat source 1a to generate high-pressure refrigerant gas (working fluid); The absorber 2 is an absorber that cools a dilute solution and absorbs refrigerant gas into the dilute solution.
pipes 3, 3, ... and a fan 4 that cools the pipes 3, 3, ... by blowing air. It cools by blowing air and absorbs refrigerant gas into the dilute solution.

The generator 1 and absorber 2 are connected by a dilute solution pipe 5. The dilute solution pipe line 5 includes, in order from the generator 1 side to the absorber 2 side, a dilute solution flow section 5a, a coarse gas-liquid mixed flow section 5b, and a tight gas-liquid mixed flow section 5.
The dilute solution is divided into three parts c, 5c, . In 5b, there is a coarse gas-liquid mixed flow in which refrigerant gas from the evaporator 10 (described later) is mixed in the dilute solution to a coarse degree, that is, in the form of large bubbles. Inside 5c, a gas-liquid mixed flow in which refrigerant gas is mixed in a dilute solution so as to be densely packed into a large number of fine bubbles flows respectively.

The generator 1 and absorber 2 are also connected by a concentrated solution pipe line 6 that supplies the low temperature, low pressure concentrated solution in the absorber 2 after absorbing the refrigerant gas to the generator 1. A solution pump 7 is disposed in the middle of the concentrated solution pipe 6, and the operation of the solution pump 7 circulates the solution between the generator 1 and the absorber 2.

On the other hand, 8 is a condenser that cools and condenses the high-temperature, high-pressure refrigerant gas generated in the generator 1 with cooling water in the cooling water heat transfer tube 8a, and 9 is a condenser that cools and condenses the high-temperature and high-pressure refrigerant gas generated in the generator 1. 10 is an evaporator that evaporates the refrigerant liquid whose pressure has been reduced by the expansion valve 9, and the evaporator 10 is connected to a cold water heat transfer tube 1 through which water flows.
0a, and is configured to obtain a refrigeration effect by cooling the water in the cold water heat transfer tube 10a with the heat of vaporization of the refrigerant liquid evaporated in the evaporator 10.

Parts of the dilute solution flow section 5a of the dilute solution pipe line 5 and the concentrated solution pipe line 6 are polymerized with each other and constitute a solution heat exchanger 11 for exchanging heat between the dilute solution and the concentrated solution flowing inside each. has been done.

Further, a hermetically sealed absorber heat exchanger 12 is disposed at a connecting portion between the dilute solution flow section 5a and the crude gas-liquid mixed flow section 5b of the dilute solution pipe line 5.
The inside of 2 is communicated with the evaporator 10, and a part of the concentrated solution pipe 6 on the absorber 2 side (solution pump 7 side) than the solution heat exchanger 11 is inserted into the inside. In the absorber heat exchanger 12, the dilute solution from the generator 1 and the refrigerant gas from the evaporator 10 are cooled and roughly mixed by the concentrated solution in the concentrated solution pipe 6.

Further, the crude gas-liquid mixed flow section 5 of the dilute solution pipe line 5
b and the air-liquid mixed flow section 5c, in other words, the dilute solution pipe line 5 between the absorber heat exchanger 12 and the absorber 2 that absorbs the refrigerant gas in the pipe is equipped with the dilute solution pipe line 5 of the present invention. A gas-liquid mixer 13 as an example is provided. As shown in enlarged detail in FIG. 2, the gas-liquid mixer 13 includes an upright closed cylindrical body 14, one inlet pipe 15, and a plurality of outlet pipes 16, 16, . One end of the inlet pipe 15 is connected to the body 1.
4, and the other end is connected to the downstream end of the crude gas-liquid mixed flow section 5b of the dilute solution pipe line 5, and the crude mixture of the refrigerant gas sent from the absorber heat exchanger 12 and the dilute solution is A gas-liquid mixture stream is introduced into the shell 14 by an inlet tube 15.

On the other hand, the plurality of outlet pipes 16, 16,...
As shown in FIG.
The lower end of each outlet pipe 16 penetrates the bottom surface of the shell 14, is led out to the outside of the shell 14, and is connected to each pipe 3 of the absorber 2. . In addition, each of the above outlet pipes 1
There is an outlet pipe 1 on the side of the part located inside the body 14 of 6.
A large number of small holes 17, 17, . The gas-liquid mixed flow inside the shell 14 is discharged to the outside through outlet pipes 16, 16, . . . .

Next, to explain the operation of the above embodiment,
When the solution pump 7 is operated while the heat source 1a of the generator 1 is operated and the fan 4 of the absorber 2 is operated, the low-pressure concentrated solution in the absorber 2 passes through the concentrated solution pipe 6 to the generator. 1 and heated by the heat source 1a in the generator 1, and as a result of this heating, high temperature and high pressure refrigerant gas is generated from the concentrated solution. and,
This refrigerant gas is condensed into a refrigerant liquid in the condenser 8, and then the refrigerant liquid is evaporated in the evaporator 10 and returned to low-pressure refrigerant gas, thereby providing a refrigerant effect.

On the other hand, the high-temperature, high-pressure dilute solution in the generator 1 after generating the high-pressure refrigerant gas is refluxed into the absorber 2 through the dilute solution pipe line 5 due to the pressure, and the solution heat exchanger 11 and absorber heat exchanger 12
At this point, heat is exchanged with the low-temperature concentrated solution in the concentrated solution pipe 6, and the temperature becomes low. In addition, the absorber heat exchanger 1
While the dilute solution passes through the gas-liquid mixer 13 on the downstream side, the dilute solution is roughly mixed with the low-pressure refrigerant gas from the evaporator 10 to become a crude gas-liquid mixed flow. During the passage, the refrigerant gas becomes a large number of fine bubbles and changes into a gas-liquid mixed flow mixed in a dilute solution. The solution is cooled by blowing air, and as a result of this cooling, the refrigerant gas mixed in the dilute solution is absorbed into the dilute solution, and the dilute solution becomes a concentrated solution.
This completes one cycle of solution circulation, and the same cycle as above is repeated thereafter.

In this case, the relationship between the solution concentration and enthalpy at each position A to F in the solution circulation cycle shown in FIG. 1 is as shown in FIG. 6. That is, from position F (the upstream end position of the crude gas-liquid mixed flow section 5b of the dilute solution pipe line 5) to position A (the upstream end position of the concentrated solution pipe line 6), there is a substantially equal pressure process, and the gas-liquid mixing The smaller the passage resistance in the vessel 13, the easier the solution tends to flow into the absorber 2.

Therefore, taking this point into consideration, the operation of the gas-liquid mixer 13 will be described in detail.
4, some of the refrigerant gas in the crude gas-liquid mixed flow escapes from the dilute solution and accumulates in the upper space 14a in the shell 14, and then passes through each outlet pipe 16.
It flows into each outlet pipe 16 from the upper end opening 16a and descends therein. On the other hand, the remaining crude gas-liquid mixed flow flows through the large number of small holes 17, 1 in each outlet pipe 16.
The refrigerant gas flows into the refrigerant gas from 7, . . . in a direction perpendicular to the descending refrigerant gas flow. This small hole 17,
As shown in FIG. 3, the coarse gas-liquid mixed flow flowing in from 17, ... collides with the descending refrigerant gas, so that the coarse gas-liquid mixed flow is agitated in each outlet pipe 16, and at that time, , the large number of small holes 17, 17, . . . are opened in the side surface of the outlet pipe 16 in a spiral shape in the tube axis direction, and the coarse gas-liquid mixed flow flows in a spiral shape from the small holes 17, 17, . The stirring action within each of the outlet pipes 16 is further promoted. Due to this stirring action, the bubbles of the refrigerant gas in the coarse gas-liquid mixed flow are atomized and the degree of mixing into the dilute solution becomes dense, and this dense gas-liquid mixed flow is absorbed after flowing out of each outlet pipe 16. Vessel 2
will begin to flow into the country.

Therefore, in order to mix the refrigerant gas and the dilute solution by colliding the crude gas-liquid mixed flow in this way, the refrigerant gas and the dilute solution can be sufficiently mixed, and the gas-liquid mixer The flow resistance of the whole 13 can be kept low, and a sufficient amount of the solution can flow into the absorber 2 as described above, so that the absorption of refrigerant gas in the absorber 2 can be effectively promoted.

Further, when the liquid level in the body 14 of the gas-liquid mixer 13 abnormally rises to a position higher than the upper end opening 16a of each outlet pipe 16, the dilute solution also flows into the outlet pipe 16 from the upper end opening 16a. As a result, the liquid level decreases due to an increase in the amount of liquid flowing out from the gas-liquid mixer 13, and on the other hand,
Conversely, when the liquid level abnormally drops to near the bottom of the shell 14, the solution discharge area decreases and the gas-liquid mixer 13
Since the liquid level rises due to the decrease in the amount of liquid flowing out from the tank, the liquid level settles at a height position where the above two suppressions are balanced, and thus the liquid level in the barrel 14 is self-stabilized. I can do it.

It should be noted that the present invention is not limited to the above-mentioned embodiment, but also includes various modifications. For example, in the above-mentioned embodiment, the outlet pipe 1 in the body 14 is
6, 16, ... are arranged in a ring shape in one row as shown in FIG. 4, but they may be arranged concentrically in multiple rows as shown in FIG. 7, or as shown in FIG. They may be arranged in one row, and then one outlet pipe 16 may be further arranged in the center of the shell 14, and this can be changed as appropriate depending on the refrigerating capacity of the absorption refrigerator.

In addition, a small hole 1 formed on the side surface of each outlet pipe 16
7, 17, . . . are arranged so that the small holes 17, 17 of each set face each other in the horizontal plane in the diametrical direction of the outlet pipe 16, and are vertically adjacent to each other, as shown in FIG. The opposing directions of each set may be offset from each other by an angle of 90° in the circumferential direction of the outlet pipe 16. Further, each outlet pipe 16 may have an upper end opening 16a that opens obliquely as shown in FIG. 10, and the same effect as in the above embodiment can be achieved.

Further, in the above embodiment, the present invention was applied to the gas-liquid mixer 13 of an absorption refrigerating machine. It goes without saying that the present invention can also be applied to the gas-liquid mixer (see ).

[Brief explanation of drawings]

1 to 10 show an embodiment of the present invention, in which FIG. 1 is an overall configuration diagram of an absorption refrigerator, FIG. 2 is an enlarged vertical cross-sectional view of a gas-liquid mixer, and FIG. Figure 4 is an enlarged view of the area surrounded by the dashed-dotted circle.
5 is a front view of the outlet pipe,
Fig. 6 is an explanatory diagram showing the relationship between solution concentration and enthalpy in the solution circulation cycle, and Figs. 7 and 8 are equivalent to Fig. 4, respectively, showing modified examples of the outlet pipe arrangement in the body of the gas-liquid mixer. 9 and 10 are views corresponding to FIG. 5 showing a modified example of the outlet pipe, respectively. FIG. 11 is a sectional view showing a conventional example of a gas-liquid mixer, and FIG.
FIG. 2 is a schematic diagram of an absorption refrigerator and a concentration difference engine. DESCRIPTION OF SYMBOLS 1... Generator, 2... Absorber, 5... Dilute solution pipe line, 6... Concentrated solution pipe line, 7... Solution pump, 8...
...Condenser, 9...Expansion valve, 10...Evaporator, 11
...Solution heat exchanger, 12 ...Absorber heat exchanger, 1
3, 13', 13''... Gas-liquid mixer, 14... Shell,
14a...Upper space, 15...Inlet pipe, 16,1
6', 16''...Outlet pipe, 16a, 16'a, 1
6″a...Top opening, 17...Small hole.

Claims (1)

[Claims for Utility Model Registration] (1) A generator 1 that heats a concentrated solution to generate a gaseous working fluid, an absorber 2 that absorbs the working fluid into a dilute solution in a pipe, and the absorber 2 From generator 1
In the absorption solution cycle system, the absorber 2 and the absorber heat exchanger 12 are equipped with an absorber heat exchanger 12 that cools and roughly mixes the working fluid and the dilute solution with a concentrated solution flowing through the absorber 2 and a solution pump 7. A gas-liquid mixer 13 disposed in the dilute solution pipe 5 between the cylinders 14 and 14, which is connected to the side surface of the cylinder 14 and which is fed from the absorber heat exchanger 12. An inlet pipe 15 that introduces a crude gas-liquid mixed flow of working fluid and dilute solution into the shell 14
and an upright opening 16 within the body 14.
A is erected facing the upper space 14a in the body 14, and has a number of small holes 1 on the side.
7, 17, ... are formed, and a plurality of outlet pipes 16, 16, which discharge the gas-liquid mixed flow inside the shell 14 to the outside.
A gas-liquid mixer of an absorption solution cycle system, characterized by comprising the following. (2) A large number of small holes 17, 17, ... are arranged spirally in the axial direction of the outlet pipe 16 in the gas-liquid mixing system of the absorption solution cycle system according to claim (1) of the utility model registration claim. vessel. (3) Many small holes 17, 17,...
Each set of small holes 17, 17 is connected to the outlet pipe 16.
Utility model registration claim No. Gas-liquid mixer of absorption solution cycle system as described in 1).