JPH0448171A - Refrigerant mist prevention device for absorption refrigerators - Google Patents

Abstract

PURPOSE:To prevent flashing in an evaporator and preclude the generation of refrigerant mist by a method wherein refrigerant, condensed in a condenser, is precooled before entering the evaporator to reduce the temperature of the condensed refrigerant to the same level as a refrigerant temperature in the evaporator. CONSTITUTION:Refrigerant is absorbed by an absorber 1 and solution, whose concentration is reduced, is supplied to a low-temperature re-producer 3 and a high-temperature re-producer 5 by a solution pump 8 through a heat exchanger 6. When the solution is condensed in both re-producers, high-temperature refrigerant vapor is generated. The refrigerant vapor is sent into a condenser 4 to cool it and obtain condensed refrigerant, however, the temperature of the condensed refrigerant is higher than the inside temperature of the evaporator 2. In order to reduce the temperature, the refrigerant in a refrigerant tank 7 is circulated to a precool device 10 by a refrigerant pump 9. The temperature of the condensed refrigerant, discharged out of the precool device 10, becomes the same level ax the inside temperature of the evaporator 2 and, accordingly, flashing will never be caused when the condensed refrigerant enters the evaporator 2.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a water-lithium bromide absorption refrigerating machine, and particularly to a refrigerant mist prevention device for stopping flashing of condensed refrigerant in an evaporator. .

[Conventional technology]

Conventionally, methods such as increasing the refrigerant vapor passage area to lower the vapor flow rate and preventing refrigerant mist from flowing out into the absorber by applying it to baffles have been used. No consideration was given to preventing flashing.

[11 Problems to be Solved by the Invention] Conventionally, only measures have been taken to prevent the generated refrigerant mist from leaking out from the evaporator to the absorber, but no consideration has been given to preventing the generation of refrigerant mist.

An object of the present invention is to pre-cool the refrigerant condensed in the condenser before entering the evaporator, thereby preventing flashing within the evaporator and preventing the generation of refrigerant mist.

[Means to solve the problem]

The above objective is achieved by reducing the temperature of the condensed refrigerant to the same level as the refrigerant temperature in the evaporator before entering the evaporator.

Furthermore, even if the temperature is not lowered to exactly the same temperature as the refrigerant temperature in the evaporator, it is fully expected that the degree of flashing in the evaporator can be avoided by pre-cooling the condensed refrigerant.

Pre-cooling includes a method of circulating a portion of the refrigerant in the evaporator to exchange heat, and a method of exchanging heat with a portion of the cold water.

[Effect]

A water-lithium bromide absorption refrigerator condenses high-temperature refrigerant vapor in the condenser and returns it to the evaporator. Since the temperature of this condensed refrigerant is higher than the temperature inside the evaporator, it flashes inside the evaporator and becomes refrigerant mist.

By lowering the temperature of this condensed refrigerant to the level of the temperature inside the evaporator, flashing within the evaporator is eliminated, so that no refrigerant mist is generated due to this.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The present invention provides an absorber 1. Evaporator 2° Low temperature regenerator 3.
Condenser 4. High temperature regenerator5. Heat exchanger6. refrigerant tank 7,
Solution pump8. an absorption refrigerator consisting of a refrigerant pump 9;
It consists of a pre-cooling device 10 (in FIG. 1, the refrigerant in the evaporator is used for pre-cooling).

The solution, which has become low in concentration by absorbing the refrigerant in the absorber 1, is supplied to the low-temperature regenerator 3 and the high-temperature regenerator 5 via the heat exchanger 6 by the solution pump 8.The solution is concentrated in the two regenerators. During this process, high temperature refrigerant vapor is generated. This refrigerant vapor is sent to the condenser 4, where it is cooled and becomes a condensed refrigerant, but this temperature is higher than the internal temperature of the evaporator 2, so this temperature is lowered.

A portion of the refrigerant in the refrigerant tank 7 is circulated to the precool device 10 by the refrigerant pump 9. The temperature of the condensed refrigerant passing through the pre-cooling device 10 is at the same level as the internal temperature of the evaporator 2, and therefore, there is no flushing when entering the evaporator 2.

FIG. 2 shows a case where the condensed refrigerant is cooled with cold water. A portion of the cold water cooled by the evaporator 2 is transferred to the pre-cooling device 1.
0 to lower the temperature of the condensed refrigerant. In this case, the condensed refrigerant temperature does not fall to the internal temperature of the evaporator 2, but
It is sufficiently effective in reducing the degree of flushing and preventing the generation of refrigerant mist.

In addition to the above-mentioned two sides, the cooling heat source for the pre-cooling device 10 may also be cold water from another refrigerator.

〔Effect of the invention〕

According to the present invention, it is possible to prevent the condensed refrigerant from flashing in the evaporator and to prevent the generation of refrigerant mist, which is effective in preventing corrosion of the absorber tube.

Furthermore, the flow rate of refrigerant vapor from the evaporator to the absorber can be increased to the limit, which is effective in achieving a compact design.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the flow of a refrigerant solution. 1...Absorber, 2...Evaporator, 4...Condenser, 7
... Refrigerant tank, 9... Refrigerant pump, 10... Pre-cool device i.

Claims (1)

[Claims] 1. A water-lithium bromide absorption refrigerating machine including an evaporator, an absorber, a condenser, a regenerator, a heat exchanger, a refrigerant pump, and a solution pump, comprising: from the condenser to the evaporator. A refrigerant mist prevention device for an absorption chiller, which cools the condensed refrigerant on its way back.