JPS586375A - Generator for absorption type cooling device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to an improvement in the 4<1 performance of absorption cooling devices.

Conventionally, as a generator to create an absorption cooling device, a concentrated solution was used as a generator, and the inside of a heat exchanger was
It has a once-through type configuration in which the refrigerant vapor is circulated continuously and heated by a heat source in the evening, and the purity of the refrigerant vapor heading to the condenser is increased to -4, and the sensible heat is recovered. A method is used in which a part of the concentrated solution is diverted for the purpose, and the diverted concentrated solution is brought into direct contact with the refrigerant vapor by a combination of the two. 5,
An example of this kind of 11-style generation z:( is shown below.

Arrows 1, 4, 6.71:, 1, each! 1 Main concentrated solution.

The direction of the flow of the dilute solution and refrigerant vapor is indicated by the branching of the concentrated solution and the refrigerant. Heat is obtained from the combustion gas such as LNG that is combusted by the gas burner 8 in the main fA solution flowing in from direction 1, and is boiled and evaporated, entering the gas-liquid component 11 and 3, where it becomes refrigerant vapor and diluted gas. Solutions are separated based on their specific gravity differences.

The refrigerant vapor rises between the fillings 6 of the Raschig ring tongue, enters from the direction of the arrow 4 and comes into direct contact with the branch a solution descending between the fillings 5, causing the substances and 3, - and heat exchange, and is discharged in the direction of arrow 7, that is, toward the condenser. '81: After contacting the refrigerant vapor, the branched concentrated solution is mixed with the dilute solution accumulated at the bottom of the gas-liquid separator 3, and then discharged toward the absorber in the direction of arrow 6 ( The solution discharged toward this absorber is called the final dilute solution). This is determined by the temperature and concentration d of the final dilute solution, the temperature, concentration, and needle of the branched concentrated solution to be mixed, but generally the concentration of the branched concentrated solution is higher than the concentration of the diluted solution before being mixed, and the temperature is also lower. Since it is lower than the dilute solution temperature, the final dilute solution will have a higher concentration and a lower temperature. To improve the performance of absorption chillers with such generators, the concentration and temperature of the final dilute solution can be as low as possible before mixing with the initial dilute solution, i.e., the branched concentrated solution. It is desirable that the condition be close to that of .

Otherwise, an increase in entropy will occur and the efficiency of the device will decrease. However, when using a fluorocarbon-based refrigerant as a refrigerant, it is desirable to have a device that performs well at as low a temperature as possible in terms of heat resistance, but with conventional cooling devices, it is difficult to obtain a final dilute solution at a specified temperature and concentration. It is necessary to raise the dilute solution temperature to a temperature higher than the final dilute solution temperature once in each process, which shortens the life of the solution.

The present invention aims to improve the problems of the prior art.

Detailed Description of the Present Invention Below] 1/C will be explained on page 21 and J:. FIG. 2 shows an embodiment according to the present invention. FIG. 2 shows an embodiment in which the heat of the combustion gas is used as a method of heating from the outside as a means for bringing the branched concentrated solution into contact with refrigerant vapor and then gradually raising the temperature to the temperature of the raw dilute solution. Figure 8) a. Arrow 9°14.15,16.
19 indicates the direction of flow of the main concentrated solution, one branch concentrated solution, the refrigerant vapor, the branched concentrated solution after contact with the refrigerant gas, and the final dilute solution, respectively. The main concentrated solution coming in from arrow 9 receives heat from the gas burned in burner 2Q in FinChip 10, boils, generates refrigerant vapor, becomes a gas-liquid two-phase flow, and passes through the gas-liquid separator. 11, and due to the difference in specific gravity, it separates into the main dilute solution and refrigerant vapor. When the refrigerant vapor rises in the filling tank 13, it comes into contact with the branched concentrated solution coming down in the filling tank 13 (12), exchanging heat and substances, the temperature C falls, and at the same time the purity increases, arrow 15. It is discharged toward the condenser in both directions.

On the other hand, the branched concentrated solution is brought into contact with the refrigerant vapor in the solution reservoir 12.
/ζ flows from arrow 16 to middle 4 heat exchanger 17.

The heat exchanger 17 includes a drum 1 wrapped around a burner 20.
8, which absorbs the heat of the combustion gas and boils, generating refrigerant vapor. The mixture of refrigerant vapor and branch dilute solution is raised by the bubble pump and enters the gas-liquid separator 11, where it is separated into refrigerant vapor and branch dilute solution. The branch dilute solution is mixed with the main dilute solution to form the final dilute solution.

The branch dilute solution is made to match the temperature and concentration of the main dilute solution by varying the size of the heat exchanger 17. As a result, the temperatures of the final dilute solution, the main dilute solution, and the bifurcated dilute solution are the same, and there is no reduction in efficiency due to mixing as in the conventional example.

FIG. 3 shows the estimated value of the efficiency improvement compared to the conventional example described above. The horizontal axis is expressed as a dimensionless number obtained by dividing the weight of the branched concentrated solution by the weight of the refrigerant, and the efficiency improvement rate increases by -1 as this sum increases. In addition, as the amount of the branched concentrated M solution increases, the final dilute solution temperature is significantly higher than the main dilute solution temperature in the conventional generator. This is because this results in a decrease in efficiency. In conventional methods, in order to purify refrigerant vapor and recover its sensible heat into a branched concentrated solution,
The larger the amount of branched concentrated solution, the greater the effect, but on the other hand, the larger the amount of branched concentrated solution, the more the final diluted solution temperature drops from the main diluted solution temperature, which impedes efficiency improvement by branching the concentrated solution. was. The present invention has solved such problems by using a technique in which the branched concentrated solution is brought into contact with refrigerant vapor and then heated, and has achieved remarkable effects.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a generator for a conventional absorption cooling system, Figure 2
FIG. 3 is a block diagram of a generator for an absorption cooling device according to an embodiment of the present invention, and FIG. 3 is a characteristic diagram showing the efficiency improvement rate. 2.10・-Finduup, 3.11・・・・Ki 4,
Liquid separator, 17-・Heat exchanger, 12... Solution reservoir, 18
-・Drums. Figure 2 p, (5

Claims (1)

[Claims] In an absorption cooling device that includes at least a generator, a condenser, an evaporator, an absorber, and a solution pump, one of the solutions containing a large amount of refrigerant (hereinafter referred to as concentrated solution) sent from the absorber to the generator is The concentrated solution (hereinafter referred to as branched concentrated solution) is made to flow into the refrigerant vapor passage from the gas-liquid separator provided at the outlet of the generator to the condenser without being heated, thereby removing sensible heat from the refrigerant vapor. The branched concentrated solution that has absorbed the sensible heat is heated in the generator, releases refrigerant vapor, and is mixed with a dilute solution with reduced refrigerant concentration. A generator for an absorption type cooling device, characterized in that a branched concentrated solution that is refluxed and subjected to heat exchange and mass exchange (rectification) with the refrigerant vapor in the reflux passage is further heated by an external heat source.