JP2000055497A - Triple effect absorption type refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate a double effect absorption type refrigerator at the time of a maximum load in midsummer by constituting to extract a part or all of vapor generated in a high temperature regenerator to an intermediate temperature regenerator via a bypass passage in the case of a high temperature and a high load of cooling water in midsummer or the like. SOLUTION: In the triple effect absorption type refrigerator comprising an evaporator 1, an absorber 2, a condenser 15, low temperature, intermediate temperature and high temperature regenerators 7, 8 and 9, low temperature, intermediate temperature and high temperature heat exchangers 6, 20, and 19 provided on the way of the pipings communicating with each other, a bypass passage 21 for supplying vapor generated from the regenerator 9 to a shell side of the regenerator 8 is provided. In the case of a high cooling water temperature at one time in midsummer, a part or all of the vapor generated from the regenerator 9 is bypassed to the regenerator 8. Thus, a pressure, a temperature of the regenerator 9 during operating are suppressed to those of a double effect absorption type refrigerator. Meanwhile, in an intermediate season or the like, the passage 21 is closed, and a high efficiency operation of the triple effect is intended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a triple effect absorption refrigerator used in the fields of air conditioning and refrigeration.

[0002]

2. Description of the Related Art The efficiency of a triple effect absorption refrigerator is improved to about 1.5 times as compared with a conventional double effect absorption refrigerator. Since the internal pressure of the gas becomes much higher than the atmospheric pressure and the temperature of the solution becomes much higher than 200 ° C., it has not been put into practical use due to the problem of the pressure vessel and the corrosion reliability, and the efficiency is low. Heavy duty absorption refrigerators were exclusively used.

[0003]

As described above, in the triple effect absorption refrigerator, the pressure of the high-temperature regenerator in the midsummer operating state is much higher than the atmospheric pressure.
In manufacturing, it is necessary to manufacture it as a high-pressure gas container. As a result, the thickness of the body becomes thick and the manufacturing cost increases, and in addition, a specially qualified operator is required for use. , Restrictions on use were great. When the temperature of the high-temperature regenerator in the operating state is 20
Since the temperature is much higher than 0 ° C., corrosion of the material has become a serious problem, and it has been difficult to find a material that is practically reliable. As a result, the triple utility was known to be an efficient system, but was not put to practical use and could not utilize the energy saving effect.

[0004] It is an object of the present invention to solve this problem and to make it possible to operate a triple effect absorption refrigerator in an interim period occupying most of the operation time except one time in the middle of summer within one year. It is intended to provide a type refrigerator.

[0005]

According to the present invention, when the cooling water temperature is high, such as during the middle of summer, part or all of the steam generated by the high-temperature regenerator is eliminated. By bypassing the medium-temperature regenerator, the pressure and temperature of the high-temperature regenerator during operation can be held down to the same level as conventional double-effect absorption refrigerators. Further, by closing the bypass, efficient operation with triple effect is realized.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a cycle flow diagram of a triple effect absorption refrigerator according to the present invention. Water, which is a refrigerant, evaporates in the evaporator 1 by removing heat from the cold water 2 flowing in the pipe. The evaporated refrigerant vapor flows into the absorber 3 and is absorbed by the concentrated solution returned from the regenerator, and the concentrated solution is diluted to become a dilute solution. Absorption heat generated by the absorption is released to the cooling water 4 flowing in the absorber tube.

The dilute solution is sucked by the solution pump 5 from the bottom of the absorber and exits the low-temperature heat exchanger 6, where it is divided into three parts and supplied to the low-temperature regenerator 7, medium-temperature regenerator 8, and high-temperature regenerator 9, respectively. In the high-temperature regenerator 9, the supplied dilute solution is heated and concentrated by the heating source 10 and separated into generated steam 11 and a concentrated solution. The generated steam 11 is supplied into the pipe of the intermediate temperature regenerator through the passage 12, heats and concentrates the dilute solution flowing outside the pipe, and newly separates the dilute solution into the generated steam 13 and a concentrated solution. The generated steam 13 is supplied into the pipe of the low-temperature regenerator through the passage 14,
The dilute solution flowing outside the tube is again heated and concentrated, and the dilute solution is again separated into a generated vapor and a concentrated solution.

[0008] The generated steam flows into the condenser 15 and is condensed and liquefied. The refrigerant liquid condensed in the tubes of the medium-temperature regenerator and the low-temperature regenerator reaches the condenser via the passages 16 and 17, respectively. The refrigerant liquid condensed by the condenser and the liquid refrigerant flowing into the condenser via the passages 16 and 17 merge and return to the evaporator 1. A refrigerant pump 18 is provided at a lower portion of the evaporator 1, and sprays a liquid refrigerant onto a tube group of the evaporator 1 to promote evaporation.

On the other hand, in the high-temperature regenerator 9, the medium-temperature regenerator 8, and the low-temperature regenerator 7, the respective concentrated solutions are merged into one, and return to the absorber 3 via the low-temperature heat exchanger 6. The high-temperature heat exchanger 19 that exchanges heat with the solution returning to the high-temperature regenerator 9 to increase the cycle efficiency and the heat that exchanges the solution that returns to the intermediate-temperature regenerator 8 mutually increase the cycle efficiency. The medium temperature heat exchanger 20 is often installed.

According to the present invention, in the triple effect absorption refrigerator having the above-described cycle, a bypass passage 21 for supplying a part or all of the steam generated in the high temperature regenerator 9 to the shell side of the intermediate temperature regenerator 8 is provided. Valve 22 in passage
Is provided. Instead of supplying the bypass passage directly to the shell side of the intermediate-temperature regenerator 8, the bypass passage may be configured to connect the high-temperature regenerator 9 and the passage 14 as shown in the figure. The high temperature regenerator is provided with a pressure detecting section 23, and a control device 24 which detects the pressure and determines the opening of the bypass valve is provided.

[0011]

According to the present invention, part or all of the steam generated in the high-temperature regenerator when the temperature of the cooling water is high and the load is large in the middle of summer is discharged to the intermediate-temperature regenerator through the bypass passage. At the maximum load in midsummer, it can be operated as a conventional double-effect absorption refrigerator, and during the middle period or when the load is small, the bypass passage is closed to operate as a triple-effect absorption refrigerator. Since it is possible, highly efficient operation can be performed.

Further, when the temperature of the cooling water is such that the pressure of the high-temperature regenerator exceeds the atmospheric pressure when the bypass passage is completely closed, or when the load is in a load state, the bypass passage is not completely closed. In addition, by controlling the opening and closing of the bypass valve such that the pressure of the high-temperature regenerator can be operated within a range not exceeding the atmospheric pressure in accordance with the pressure of the high-temperature regenerator, highly efficient operation can be performed.

In an air-conditioning machine, the time when the cooling water temperature reaches the specified temperature of 32 ° C. is only one time during the summer in one year, and in most other operating hours, the cooling water temperature is low and the load factor is low. , The triple-effect operation time throughout the year becomes longer, and a refrigerator with lower energy consumption than conventional double-effect absorption refrigerators can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a triple effect absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a triple effect absorption refrigerator according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Evaporator, 2 ... Cold water, 3 ... Absorber, 4 ... Cooling water, 5 ...
Solution pump, 6 ... Low temperature heat exchanger, 7 ... Low temperature regenerator, 8 ...
Medium-temperature regenerator, 9: high-temperature regenerator, 10: heating source, 11, 1
3 ... generated steam, 12, 14, 16, 17 ... passage, 15 ...
Condenser, 18 ... Refrigerant pump, 19 ... High temperature heat exchanger, 20
... Medium temperature heat exchanger, 21 ... Bypass passage, 22 ... Valve, 23
... pressure detector, 24 ... control device.

Claims (4)

[Claims] An evaporator, an absorber, a condenser, a low-temperature regenerator, a medium-temperature regenerator, a high-temperature regenerator, one or a plurality of solution heat exchangers, piping connecting them, a solution and a refrigerant are put into a cycle. In a triple effect absorption refrigerator including liquid pumps to be circulated, part or all of the steam generated by the high-temperature regenerator is converted into the shell side of the medium-temperature regenerator or the steam generated by the medium-temperature regenerator flows into the low-temperature regenerator. A triple effect absorption refrigerator comprising: a flow passage communicating with a steam passage; and a valve provided in the flow passage. 2. An evaporator, an absorber, a condenser, a low-temperature regenerator, a medium-temperature regenerator, a high-temperature regenerator, one or a plurality of solution heat exchangers, piping connecting them, a solution and a refrigerant are placed in a cycle. In a triple effect absorption refrigerator including liquid pumps to be circulated, part or all of the steam generated by the high-temperature regenerator is converted into the shell side of the medium-temperature regenerator or the steam generated by the medium-temperature regenerator flows into the low-temperature regenerator. A triple effect absorption refrigeration characterized by providing a flow passage communicating with the steam passage and controlling a valve provided in the flow passage so that the pressure of the high-temperature regenerator during operation does not exceed a certain value. Machine. 3. The triple effect absorption refrigerator according to claim 2, wherein the solution discharged from the absorber is separated and supplied in parallel to a high temperature regenerator, a medium temperature regenerator and a low temperature regenerator. A triple effect absorption chiller characterized by comprising. 4. The triple effect absorption refrigerator according to claim 1, wherein a valve installed automatically discharges steam to a downstream intermediate temperature regenerator when the pressure on the primary side exceeds a set value. A triple-effect absorption chiller characterized by a safety valve that operates.