JPH0379968A - Double effect absorption refrigerating apparatus - Google Patents

Abstract

PURPOSE:To facilitate the mixing of a medium concentrated liquid and a concentrated liquid, make the startup of operation smooth and enhance the heat transmitting performance of a low temperature heat exchanger by switching the concentrated liquid from a high temperature regenerator between the front and rear positions of a medium concentrated liquid pump by means of pressure in the high temperature regenerator or a gas-liquid separator. CONSTITUTION:A concentrated liquid from a high temperature regenerator 1, after passage through a high temperature heat exchanger 4, is introduced into either a sucking pipe 22a of a medium concentrated liquid pump 6 or a discharge pipe 22b thereof via switchover valves 9 and 9' and this switching action is produced by a signal given the inner pressure of the inner pressure of the high temperature regenerator 1 or a gas-liquid separator 2. If, for example, this pressure is low, a concentrated liquid is led to the sucking pipe 22a so as to be mixed with a medium concentrated liquid and forced out by the medium concentrated liquid pump 6. If this pressure is sufficiently high, the concentrated liquid is led to the discharge pipe 22b so as to be mixed with the medium concentrated liquid and, due to the exertion thereon of the discharge pressure of the medium concentrated liquid pump 6, the flashing of the concentrated liquid can be prevented. This permits the flow rate of the mixed concentrated liquid in a low temperature heat exchanger 5 to be increased, the heat transmitting performance to be enhanced and the subject apparatus to be compacted.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement in a dual-effect absorption refrigerator.

<Prior Art> Japanese Patent Publication No. 4B-32384, for example, is known as a conventional technology of a dual-effect absorption refrigerator.

In such a dual-effect absorption chiller, the concentrated liquid from the high-temperature regenerator that has flown out of the high-temperature heat exchanger is mixed with the intermediate concentrated liquid of the low-temperature regenerator, and is then transferred between the low-temperature regenerator and the absorber. The water is guided to the absorber's dispersion device via a low-temperature heat exchanger due to the pressure difference and water head difference.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional dual-effect absorption chiller, the mixed A liquid is mixed with the concentrated liquid flowing out of the high temperature heat exchanger and the intermediate A liquid from the low temperature regenerator. The pressure is the pressure in the low-temperature regenerator plus the head pressure equivalent to the liquid column, so the difference between the pressure in the absorber and the pressure in the absorber is small, and the flow rate of the mixed concentrated liquid in the low-temperature heat exchanger can be increased. Since this is not possible, it is necessary to widen the heat transfer area of the low-temperature heat exchanger.

In addition, if the concentrated liquid flowing out of the high-temperature heat exchanger is in an overheated state, it will flash when mixed with the intermediate concentrated liquid, and the intermediate a
There was a problem that the flow of the liquid was obstructed and the original performance could not be achieved.

In view of the above circumstances, the present invention smoothly mixes the concentrated liquid flowing out of the high-temperature heat exchanger and the intermediate concentrated liquid from the low-temperature regenerator,
The object of the present invention is to provide a dual-effect absorption refrigerator that solves the above problems by improving the heat transfer performance of mixed concentrated liquid in a low-temperature heat exchanger.

Means for Solving the Problems> The present invention provides a dual-effect absorption refrigerator equipped with an intermediate concentrate pump in an intermediate concentrate pipe line between a low-temperature regenerator and a low-temperature heat exchanger. Alternatively, a shutoff valve or control valve is installed in the concentrated liquid piping so that the concentrated liquid exiting the high-temperature heat exchanger can be switched and connected to the suction side and discharge side of the intermediate concentrated liquid pump depending on the pressure of the gas-liquid separator. It is.

Further, in this case, the solution temperature of the high temperature regenerator or gas-liquid separator may be used instead of the pressure of the high-temperature regenerator or gas-liquid separator.

Further, in this case, instead of the pressure of the high temperature regenerator or the gas-liquid separator, the temperature of the refrigerant from the high temperature regenerator condensed in the low temperature regenerator may be used.

Further, in this case, the temperature of the intermediate concentrated liquid at the outlet of the low temperature regenerator may be used instead of the pressure of the high temperature regenerator or the gas-liquid separator.

Due to the above configuration, when mixing the intermediate concentrated liquid that has exited the low-temperature regenerator and the concentrated liquid from the high-temperature regenerator that has flowed out of the high-temperature heat exchanger, the high-temperature regenerator or gas-liquid separator When the internal pressure is low, perform this on the suction side of the intermediate concentrated liquid pump. In addition, when the pressure in the high temperature regenerator or gas-liquid separator is sufficiently high, it is carried out on the discharge side of the intermediate concentrated liquid pump.

In this way, the solution temperature is controlled by the pressure in the high temperature regenerator or gas-liquid separator, or an equivalent effect is obtained, the temperature of the refrigerant from the high temperature regenerator condensed in the low temperature regenerator, and the temperature of the refrigerant at the outlet of the low temperature regenerator. By changing the mixing location depending on the temperature of the intermediate liquid, etc., it is possible to easily mix the intermediate concentrated liquid and the ``a liquid'', making the start of operation smooth and stable.
Improves the heat transfer performance of low temperature heat exchangers.

<Example> The present invention will be described below based on the drawings of the example.

The drawing shows an example of installing an intermediate concentrated liquid pump in a dual-effect absorption refrigerator. 1 is a high-temperature regenerator that is heated by a burner, etc., and a gas-liquid separator 2 installed in the high-temperature regenerator 1 is A low-temperature regenerator 3 is connected, and the refrigerant vapor from the high-temperature regenerator 1 heats the transverse waves in the low-temperature regenerator 3 and condenses. At this time, the refrigerant vapor generated in the low-m amphigenator 3 is converted into refrigerant liquid in the condenser 8, and piping is provided so that the refrigerant liquid is guided to the evaporator 10. 11
The refrigerant is separated from the concentrated liquid in the high-temperature regenerator 1 and the low-temperature regenerator 3, and the refrigerant vapor in the vessel is absorbed by the evaporator 10.
The absorber 11 is connected to a low-temperature heat exchanger 5 via an absorption liquid pump 20, and the low-temperature heat exchanger 5 is connected to a high-temperature regeneration via a high-temperature heat exchanger 4. Connect the piping back to vessel 1. In addition, liquid a branched from the gas-liquid separator 2 is branched into the suction side and discharge side of the intermediate concentrated liquid pump 6 connected to the low temperature regenerator 3 via the high temperature heat exchanger 4.
li 5.5E. In this case, switching valves 9 and 9' serving as cutoff valves or control valves are arranged in the front and rear branch pipes. Further, the discharge side of the intermediate concentrated liquid pump 6 faces the low temperature heat exchanger 5. Furthermore, 7 is a transverse wave control well interposed in the return pipe section between the high temperature heat exchanger 4 and the high temperature regenerator 1; 17 is connected to a control device 18.

13 is a switching valve control device that detects the pressure of the gas-liquid separator 2 with a pressure detector 12 and manually inputs the value;
3 to which the switching valves 9 and 9' are connected, and a temperature detector 14 of the gas-liquid separator 2, a temperature detector 15 provided in the refrigerant liquid pipe through which the refrigerant liquid condensed in the low-temperature regenerator 3 flows, and the low-temperature regenerator. A temperature sensor 16 provided on the intermediate concentrated liquid pipe of No. 3 is connected. In the figure, 21 is a refrigerant pump.

Next, to explain this operation, first, refrigerant vapor from the high temperature regenerator 1 is separated in the gas-liquid separator 2, and semen is heated and condensed in the low temperature regenerator 3. At this time, the refrigerant vapor generated in the low-temperature regenerator 3 is liquefied in the condenser 8, and this refrigerant liquid is dispersed and dripped in the evaporator 10, and a refrigeration cycle is adopted in which this vaporization cools the cold water passing through the tubes. .

In this case, the concentrated liquid from the high temperature regenerator 1 is transferred to the high temperature heat exchanger 4.
After flowing out, it flows into the suction pipe 22a or the discharge pipe 22b of the intermediate concentrated liquid pump 6 via the switching valve 9.9'. This is done using signals such as For example, if this pressure is low, the concentrated liquid is connected to the suction pipe 22a and mixed with the intermediate concentrated liquid, and then pumped out by the intermediate f4 liquid pump 6.

Further, when this pressure is sufficiently high ε, the concentrated liquid is connected to the discharge pipe 22b and mixed with the intermediate 'a liquid, and the discharge pressure of the intermediate concentrated liquid pump 6 is applied, so that flushing of the concentrated liquid is prevented.

This increases the flow rate of the mixed concentrated liquid in the low-temperature heat exchanger 5, thereby improving heat transfer performance and making it more compact.

In addition, the location where the intermediate concentrated liquid and concentrated liquid are mixed is set to high temperature regenerator 1.
Alternatively, it can be switched depending on the pressure inside the gas-liquid separator 2 to improve the circulation of the concentrated liquid, resulting in smooth start-up and stable operation.

Furthermore, the switching of the switching valves 9 and 9' is not limited to the pressure of the high temperature regenerator 1 or the gas-liquid separator 2, but also the pressure of the high temperature regenerator 1.
Alternatively, the temperature of the solution in the gas-liquid separator 2 may be detected by the temperature detector 14, and the measurement may be performed based on this. Alternatively, the temperature of the refrigerant from the high-temperature regenerator 1 condensed in the low-temperature regenerator 3 may be detected by the temperature detector 15. The same effect can also be obtained by detecting the temperature of the intermediate concentrated liquid at the outlet of the low temperature regenerator 3 with the temperature detector 16 and switching the switching valves 9, 9' based on this detection.

<Effects of the Invention> As described above, the double-effect absorption refrigerator of the present invention uses the pressure of the high-temperature regenerator or gas-liquid separator to transfer the concentrated liquid that has exited the high-temperature regenerator to the front and back positions of the intermediate concentrated liquid pump ( By switching between the suction side and the discharge side, it is easy to mix the intermediate concentrated liquid and the concentrated liquid, smooth the start-up of operation, ensure stable operation, and improve the heat transfer performance of the low-temperature heat exchanger. have an effect.

[Brief explanation of drawings]

The drawings are schematic illustrations of embodiments of the invention. 1... High temperature amphigenizer, 2... Gas-liquid separator, 3... Low temperature regenerator, 4... High temperature heat exchanger, 5... Low temperature heat exchanger, 6... Intermediate concentrated liquid Pump, 8...Condenser, 9,9
'...Switching valve, 10...Evaporator, 11...Absorber, 12...Pressure detector,]3...Switching valve control device,
1-4゜15゜6... Temperature detector, a... Suction pipe. b...Discharge pipe.

Claims (1)

[Claims] 1. In a dual-effect absorption refrigerator equipped with an intermediate concentrate pump in the intermediate concentrate pipe line between the low-temperature regenerator and the low-temperature heat exchanger, the high-temperature regenerator or the gas-liquid separator The concentrated liquid piping is equipped with a shutoff valve or a control valve so that the concentrated liquid exiting the high temperature heat exchanger can be switched and connected to the suction side and the discharge side of the intermediate concentrated liquid pump according to the pressure of Heavy-effect absorption refrigerator. 2. In the dual-effect absorption refrigerator according to claim 1, the solution temperature of the high-temperature regenerator or gas-liquid separator is used instead of the pressure of the high-temperature regenerator or gas-liquid separator. . 3. In the double-effect absorption refrigerator according to claim 1, the temperature of the refrigerant from the high-temperature regenerator condensed in the low-temperature regenerator is used instead of the pressure of the high-temperature regenerator or the gas-liquid separator. type refrigerator. 4. The double-effect absorption refrigerator according to claim 1, in which the temperature of the intermediate concentrated liquid at the outlet of the low-temperature regenerator is used instead of the pressure of the high-temperature regenerator or the gas-liquid separator.