JP2927938B2 - Double effect absorption refrigerator - Google Patents

Description

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

<Conventional technology> As a conventional technology of a double effect absorption refrigerator, for example, as shown in Japanese Patent Publication No. 46-32384, concentrated liquid from a high temperature regenerator that has exited a high temperature heat exchanger is regenerated at a low temperature. Some objects are led through the low-temperature heat exchanger to the spraying device of the absorber due to the pressure difference and the liquid level difference between the absorber and the absorber.

<Problems to be Solved by the Invention> However, in the conventional double-effect absorption refrigerator described above, when the pressure in the high-temperature regenerator is low, the level of the absorbent in the high-temperature regenerator rises. In some cases, the absorbing liquid was caught in the refrigerant vapor.

Also, when the pressure in the high-temperature regenerator is high, the level of the absorbing liquid in the high-temperature regenerator is lowered, and the refrigerant vapor is mixed with the concentrated liquid, which may lower the capacity of the double effect absorption refrigerator.

In view of the above circumstances, an object of the present invention is to provide a double effect absorption refrigerator capable of performing a stable operation while controlling the flow rate of the concentrated solution to keep the level of the absorbent in the high-temperature regenerator constant. It was done.

<Means for Solving the Problems> In the present invention, a concentrated liquid obtained by mixing a concentrated liquid from a high-temperature regenerator and an intermediate liquid from a low-temperature regenerator is heat-exchanged with a rare liquid in a low-temperature heat exchanger. Then, in the absorption refrigerator which is sprayed on the heat transfer tube of the absorber, a control valve provided between the high-temperature heat exchanger outlet of the concentrated liquid pipe and the mixing point of the concentrated liquid and the intermediate concentrated liquid, A mechanism for detecting the temperature of the regenerator or the gas-liquid separator and controlling the opening of the control valve.

Further, after the concentrated liquid obtained by mixing the concentrated liquid from the high-temperature regenerator and the intermediate concentrated liquid from the low-temperature regenerator is heat-exchanged with the dilute liquid in the low-temperature heat exchanger, it is absorbed into the heat transfer tube of the absorber. In the type refrigerator, a control valve provided between a high-temperature heat exchanger outlet of a concentrate pipe and a mixing point of a concentrate and an intermediate concentrate, and a control valve for detecting the temperature of a low-temperature regenerator And a mechanism for controlling the opening.

<Operation> Due to the above configuration, if the temperature of the high-temperature regenerator or the gas-liquid separator (or low-temperature regenerator) changes, the control valve is appropriately controlled in accordance with the change, and the liquid of the high-temperature regenerator is controlled. Surface (liquid level of the concentrated liquid tube at the outlet of the high-temperature regenerator) is kept constant.
Therefore, the liquid level of the absorbing liquid in the high-temperature regenerator rises, the absorbing liquid is not entrained in the refrigerant vapor, the liquid level drops, and the refrigerant vapor is not mixed with the concentrated liquid, and the capacity is not reduced. The refrigerator can be operated in a stable state.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

The drawing shows an example of installation of a control valve of a double effect absorption refrigerator. Reference numeral 1 denotes a high-temperature regenerator heated by a burner or the like, and a low-temperature regenerator 3 is provided in a gas-liquid separator 2 provided in the high-temperature regenerator 1. And the refrigerant vapor from the high-temperature regenerator 1 heats and condenses the rare liquid in the low-temperature regenerator 3. At this time, the refrigerant vapor generated in the low-temperature regenerator 3 is converted into a refrigerant liquid in the condenser 8, and piping is provided so as to guide the refrigerant liquid to the evaporator 10. Reference numeral 11 denotes an absorber for spraying the concentrated liquid from which the refrigerant has been separated by the high-temperature regenerator 1 and the low-temperature regenerator 3 to absorb the refrigerant vapor in the container and maintain the inside of the evaporator 10 at a low pressure. Is connected to a low-temperature heat exchanger 5 via an absorbent pump 25, and the low-temperature heat exchanger 5 is connected to a pipe returning from the high-temperature heat exchanger 4 to the high-temperature regenerator 1 via the diluted liquid control valve 7. The concentrated liquid diverted from the gas-liquid separator 2 is connected to the suction side of the intermediate concentrated liquid pump 6 connected to the low-temperature regenerator 3 via the high-temperature heat exchanger 4. A control valve 9 is provided in this pipe line. In addition, a temperature detector 21 is attached to this pipe line. A control valve controller 13 detects the pressure of the gas-liquid separator 2 with the pressure detector 12 and inputs the value.
Is connected to the control valve 9. Reference numeral 18 denotes a heating amount control device for detecting the liquid level of the gas-liquid separator 2 with the liquid level detector 17 and inputting the value. The heating amount control device 18 controls the return pipe side of the high temperature heat exchanger 4. Connect the valve 7. Control valve control device 13
Inputs a value detected by the liquid level detector 17. Further, the control valve control device 13 includes a liquid level detector 20 attached to a pipe on the high-temperature heat exchanger side derived from the gas-liquid separator 2, a temperature detector 14 provided in the gas-liquid separator 2, and a low-temperature detector 14. A temperature detector 16 provided in an intermediate concentrated liquid pipe line of the regenerator 3 and a temperature detector 15 provided in a refrigerant liquid pipe through which the refrigerant liquid condensed in the low temperature regenerator 3 is connected;
Further, temperature detectors 23 and 24 provided before and after the cooling water pipe led into the condenser 8 and a temperature detector 22 provided before the return pipe line of the high-temperature heat exchanger 4 are connected. 26 is an evaporator
This is a refrigerant pump provided at the lower part of 10.

Next, the operation will be described. First, the refrigerant vapor generated in the high-temperature regenerator 1 is separated by the gas-liquid separator 2, and the low-temperature regenerator 3 heats and condenses the rare liquid. At this time, the refrigerant vapor generated in the low-temperature regenerator 3 is liquefied in the condenser 8, and these refrigerant liquids are sprayed and dropped in the evaporator 10. This vaporization cools the cold water passing through the tube, and further cools the water from the evaporator 10. A known refrigeration cycle is achieved in which the refrigerant vapor is absorbed by the absorbing liquid in the absorber 11, and the diluted solution returns to the high-temperature regenerator 1 via the low-temperature heat exchanger 5 and the high-temperature heat exchanger 4.

Here, the liquid level of the high-temperature regenerator (concentrated liquid pipe at the outlet of the high-temperature regenerator) is detected by the liquid level detector 20. In this case, when it is detected that the liquid level is high, the control valve 9 is opened by a signal from the control valve control device 13, and when the liquid level is low, the control valve 9 is opened.
The liquid level of the high-temperature regenerator 1 (the liquid level of the concentrating tube at the outlet of the high-temperature regenerator) is kept constant by controlling the direction of closing. Further, the heating amount control device 18 controls the valve opening of the control valve 7 by inputting the detection value of the liquid level detector 17. For this reason, the liquid level of the absorbing liquid in the high-temperature regenerator 1 which occurs conventionally does not rise, and the absorbing liquid is not caught in the refrigerant vapor, and the refrigerant vapor does not mix with the concentrated liquid due to the lowering of the liquid level, thereby lowering the capacity.

Here, in the above configuration, instead of detecting the liquid level of the concentrated liquid pipe at the outlet of the high temperature regenerator 1, the liquid level of the gas-liquid separator 2 is detected by the liquid level detector 17 and the control valve 9 is opened. The degree may be controlled. Alternatively, the liquid level of the high temperature regenerator 1 or the low temperature regenerator 3 may be detected to control the valve opening of the control valve 9 to control the concentrated liquid.

Further, the internal pressure of the high temperature regenerator 1 or the gas-liquid separator 2 may be detected by the pressure detector 12 to control the opening degree of the control valve 9.

Also, instead of the liquid level of the concentrated liquid tube at the outlet of the high temperature regenerator 1,
The temperature of the low-temperature regenerator 3 is detected by the temperature detector 16, and the valve opening of the control valve 9 provided between the outlet of the high-temperature heat exchanger 4 in the concentrated liquid line and the mixing point of the concentrated liquid and the intermediate concentrated liquid. Or the temperature difference between the intermediate concentrated liquid temperature at the outlet of the low-temperature regenerator 3 and the concentrated liquid temperature at the outlet of the high-temperature heat exchanger 4 is detected by the temperature detectors 16 and 21 to control the valve opening. You may.

In the above, instead of the liquid level of the concentrated liquid pipe at the outlet of the high-temperature regenerator 1, the temperature of the outlet of the low-temperature regenerator 3 of the refrigerant generated in the high-temperature regenerator 1 is detected and controlled by the temperature detector 15. Valve 9
May be controlled.

Further, in the above, instead of the liquid level of the concentrated liquid tube at the outlet of the high temperature regenerator 1, the intermediate concentrated liquid temperature of the intermediate concentrated liquid tube from the low temperature regenerator 3 to the mixing point of the concentrated liquid and the intermediate concentrated liquid is calculated as follows: Temperature detector 16
And the opening degree of the control valve 9 may be controlled.

Further, there is a mechanism for detecting the liquid level of the high-temperature regenerator 1 or the low-temperature regenerator 3 to control the valve opening of the control valve 9 between the mixing point of the concentrated liquid and the intermediate concentrated liquid, Instead of the liquid level of the concentrated liquid tube at the outlet of the high-temperature regenerator 1, an absorber 11 such as water, brine, or air for cooling the absorber 11 and the condenser 8, or the condenser 8
May be detected by the temperature detectors 23 and 24 and controlled by this temperature.

Also, instead of the liquid level of the concentrated liquid tube at the outlet of the high temperature regenerator 1,
The temperature of the solution in the high temperature regenerator 1 or the gas-liquid separator 2 may be detected by the temperature detector 14 to control the opening degree of the control valve 9.

Further, the temperature of the concentrated liquid between the high-temperature heat exchanger 4 and the mixing point and the temperature of the rare absorbing liquid between the high-temperature heat exchanger 4 and the high-temperature regenerator 1 are represented by:
The control valve 9 may be controlled by detecting the temperature by the temperature detectors 21 and 22.

<Effect of the Invention> As described above, the double-effect absorption refrigerator of the present invention provides a control in the middle of the concentrated liquid line connecting the outlet of the high-temperature heat exchanger and the mixing point of the concentrated liquid and the intermediate concentrated liquid. Because the valve is controlled, the rising of the liquid level of the absorbing liquid in the high-temperature regenerator does not cause the absorbing liquid of the refrigerant vapor to be entrained, and the lowering of the liquid level causes the refrigerant vapor to be mixed with the lowering of the liquid capacity without causing a decrease in capacity. A stable operation of the double effect absorption refrigerator can be obtained.

[Brief description of the drawings]

The drawing is a schematic view showing a main part of the double effect absorption refrigerator of the present invention. 1 ... high temperature regenerator, 2 ... gas-liquid separator, 3 ... low temperature regenerator, 4 ... high temperature heat exchanger, 5 ... low temperature heat exchanger, 6 ...
Intermediate concentrated liquid pump, 7 ... Dilution liquid control valve, 8 ... Condenser, 9
…… Control valve, 10 …… Evaporator, 11 …… Absorber, 12 …… Pressure detector, 13 …… Control valve control device, 14,15,16,21,22,23,24
…… Temperature detector, 17,20 …… Liquid level detector.

Continuing from the front page (72) Inventor Izumi Yonezo, 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Norio Sawada 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. In-company (72) Inventor Yuto Kobayashi 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-60-159570 (JP, A) JP-A-3-79968 ( JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25B 15/00 306 F25B 15/00 303

Claims (2)

(57) [Claims] 1. A mixed concentrated solution obtained by mixing a concentrated solution from a high-temperature regenerator and an intermediate concentrated solution from a low-temperature regenerator is subjected to heat exchange with a dilute solution in a low-temperature heat exchanger, and then transferred to a heat transfer tube of an absorber. In an absorption refrigerator to be sprayed, a control valve provided between a high-temperature heat exchanger outlet of a concentrated liquid pipe and a mixing point of a concentrated liquid and an intermediate concentrated liquid, and a high-temperature regenerator or a gas-liquid separator. A mechanism for detecting the temperature to control the opening of the control valve. 2. A mixed solution obtained by mixing a concentrated solution from a high-temperature regenerator and an intermediate concentrated solution from a low-temperature regenerator is subjected to heat exchange with a dilute solution in a low-temperature heat exchanger, and then transferred to a heat transfer tube of an absorber. In the spray absorption refrigerator, the temperature of the high-temperature heat exchanger outlet of the concentrated liquid line, the control valve provided between the mixing point of the concentrated liquid and the intermediate concentrated liquid, and the temperature of the low-temperature regenerator are detected. A double-effect absorption refrigerator comprising a mechanism for controlling the opening of the control valve.