JP2904451B2 - Double effect absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double effect absorption refrigerator, and more particularly to a double effect absorption refrigerator having an operation control mechanism suitable for obtaining excellent operation characteristics from a high load to a partial load region. It is about the machine.

[0002]

2. Description of the Related Art Conventionally, in double effect absorption refrigerators,
As means for improving the partial load characteristics, SANYO
TECHNICAL REVIEW, VOL. 22,
No. 2, JUN, 1990,
It is known that the rotation speed of an absorption liquid pump is controlled by an inverter based on a regeneration temperature of a high temperature regenerator and a cooling water inlet temperature which are sensitive to a load amount, thereby controlling a circulation amount of the absorption liquid.

[0003]

According to the prior art,
A temperature sensor, a converter such as a microcomputer that calculates the solution circulation amount based on the detected temperature, an inverter that converts the conversion value into a mechanical amount, and a temperature sensor, to configure the solution amount control system that controls the solution circulation amount according to the load. This requires a solution pump or the like to be driven, and there is a problem that the apparatus becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to realize control of a solution circulation amount without particularly requiring a large-scale device, and to reduce a load from a high load to a partial load. It is an object of the present invention to provide a double-effect absorption refrigerator having excellent operating characteristics up to the range.

[0005]

In order to achieve the above object, a double effect absorption refrigerator according to the present invention comprises an evaporator, an absorber, a condenser, a high temperature regenerator, a low temperature regenerator, and a solution. An absorption type that consists of a heat exchanger, a solution pump, a refrigerant pump, and a piping system that operatively connects these devices, and sends the dilute solution from the absorber to the high-temperature regenerator and the low-temperature regenerator in parallel. In the refrigerator , reflux from the high-temperature regenerator to the absorber
A flow meter for measuring the amount of concentrated solution in the solution circulation system,
A flow control valve that opens and closes according to the measurement result of the
It is provided in a circulation system, and controls the circulation amount of the dilute solution sent from the absorber to the high-temperature and low-temperature regenerators according to the valve opening of the flow control valve .

[0006]

The function of the above technical means is as follows. Since the amount of heat source supplied to the high-temperature regenerator is controlled to increase or decrease according to the load, the amount of the regenerated refrigerant is large when the load is high and is small when the load is low. On the other hand, since the heat transfer area of the low-temperature regenerator in which the regenerated refrigerant exchanges condensing heat is constant, the condensing temperature is high at high load and low at low load. That is, the regeneration pressure is high when the load is high, and is low when the load is low.

The operating concentration of the diluted solution is high when the load is high,
Low at low load. Here, if the parallel solution circulation system in which the dilute solution from the absorber is divided into two and sent in parallel to the high-temperature regenerator and the low-temperature regenerator is adopted, the dilute solution concentration supplied to the low-temperature regenerator Since there is no concentration step, a solution having a concentration corresponding to the load is supplied. Therefore, the concentration of the dilute solution in the low-temperature regenerator, which exchanges heat with the regenerated refrigerant in the high-temperature regenerator, is proportional to the concentration, and is high at high load and low at low load. As a result, the regeneration pressure of the high-temperature regenerator with a high load increases, and decreases at a low load.

Comprehensively evaluating the above, the regeneration pressure of the high-temperature regenerator fluctuates appropriately in proportion to the load when the parallel solution circulation system is adopted. By the way, the driving force required for circulation of the concentrated solution refluxing from the high-temperature regenerator to the absorber is:
1 is a high temperature regenerator pressure, and 2 is a position head, and the ratio is about 4.5: 1, which largely depends on the high temperature regenerator pressure. Here, if the amount of the concentrated solution flowing back from the high-temperature regenerator to the absorber is sensed, and the amount of the dilute solution supplied to the two regenerators is controlled by a valve that opens and closes in proportion to the amount of circulation, as in the prior art, It becomes possible to configure a dilute solution circulation amount control mechanism proportional to the load. Further, the amount of circulation may be detected based on the regeneration pressure of the high-temperature regenerator, which is a direct circulation driving force, or the temperature of the high-temperature regenerator correlated with the pressure.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. First, a refrigeration cycle of a general double effect absorption refrigerator will be described with reference to FIG. FIG.
It is a cycle system diagram of a general double effect absorption refrigerator. The inside of the evaporator 1 is maintained at about 1/100 atm. Water, which is a refrigerant, is sent to the evaporator 1 by the refrigerant pump 2, is removed on the heat transfer tube 3 through which the cold water flows, and evaporates by removing heat of the cold water. Thereby, a cooling action occurs. The evaporated refrigerant vapor flows into the absorber 5 maintained at a low pressure by cooling by the cooling water passing through the heat transfer tube 4, where it is absorbed by the aqueous solution of lithium bromide removed by the solution pump 6, Becomes thinner. The dilute solution is sent to a high-temperature regenerator 8 by a dilute solution pipe 11 via a dilute solution pipe 11 and a low-temperature regenerator 9 by a dilute solution pipe 12.

In the high-temperature regenerator 8, the diluted solution is directly heated by a heat source (boiler) to be separated into a vapor and a concentrated solution.
In the low-temperature regenerator 9, the steam is heated by the high-temperature regenerator 8 and separated into a vapor and a concentrated solution. The concentrated solution is supplied from the high-temperature regenerator 8 to the concentrated solution pipe 1.
By 3, the low-temperature regenerator 9 is guided again to the absorber 5 through the solution heat exchanger 7 by the concentrated solution pipe 14. The drain obtained by heating and condensing the solution in the low-temperature regenerator 9 is led to the condenser 10. The steam generated by the low-temperature regenerator 9 is supplied to the condenser 1
Condenses at 0. The condensed refrigerant thus produced is guided to the evaporator 1 and goes through a cycle.

The amount of the direct heat source supplied to the high-temperature regenerator 8 is controlled by the controller 15. In addition, absorber 5
Since the parallel solution circulation system in which the dilute solution is sent to the high temperature regenerator 8 and the low temperature regenerator 9 is adopted, the internal pressure of the high temperature regenerator 8 is maintained at a pressure proportional to the load. Since the amount of the concentrated reflux solution from the high temperature regenerator 8 to the absorber 5 is determined by the pressure, the amount of the concentrated concentrated solution is proportional to the load.

Next, the cycle system and operation of each embodiment of the present invention will be described. Embodiment 1 FIG. 1 is a cycle diagram of a double-effect absorption refrigerator according to one embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 5 denote the same parts, and a description thereof will be omitted. In FIG. 1, reference numeral 20 denotes a float valve, and reference numeral 21 denotes a float chamber provided with the float valve 20 and constituting a liquid tank in a solution circulating system.
Is provided in a concentrated solution pipe 13A related to a solution circulation system that is refluxed.

The concentrated solution concentrated by the high-temperature regenerator 8
Enter the float chamber 21. A float valve 20 is disposed in the float chamber 21 and opens and closes according to the amount of concentrated solution, that is, the load. On the other hand, the diluted solution thinned by the absorber 5 passes through the solution heat exchanger 7 by the solution pump 6,
A part is sent to the high temperature regenerator 8 by the dilute solution pipe 11B via the float valve 20 by the dilute solution pipe 11A, and the remaining part is sent to the low temperature regenerator 9 by the dilute solution pipe 12A.

According to the embodiment shown in FIG. 1, the amount of circulation of the dilute solution is controlled by the float valve 20, so that the amount of circulation of the solution according to the load can be controlled, so that efficient operation can be performed even in a partial load region. be able to.

Embodiment 2 FIG. 2 is a cycle diagram of a double-effect absorption refrigerator according to another embodiment of the present invention. In the drawing, those having the same reference numerals as those in FIG. 1 or FIG. 5 are the same parts, and the description thereof is omitted. The difference between the embodiment of FIG. 2 and the embodiment of FIG.
The amount of the concentrated solution refluxed from the high-temperature regenerator 8 to the absorber 5 by the concentrated solution pipe 13 is directly measured by the flow meter 22, and the flow control valve 23 provided in the diluted solution pipe 11 is opened and closed by a command from the control device 15. Thus, the solution circulation amount is controlled. According to the embodiment of FIG. 2, the same effect as the embodiment of FIG. 1 can be obtained.

Embodiment 3 FIG. 3 is a cycle system diagram of a double effect absorption refrigerator according to still another embodiment of the present invention. In the drawing, those having the same reference numerals as those in FIG. 2 or FIG. 5 are the same parts, and the description thereof is omitted. The embodiment of FIG. 3 differs from the embodiment of FIG. 2 in that the amount of the concentrated solution flowing back from the high temperature regenerator 8 to the absorber 5 through the concentrated solution pipe 13 is detected by the high temperature regenerator pressure measured by the pressure gauge 24. Then, the solution circulation amount control is performed by opening and closing the flow control valve 23 according to a command from the control device 15. According to the embodiment of FIG. 3, the same effects as those of the previous embodiments can be obtained.

Embodiment 4 FIG. 4 is a cycle system diagram of a double-effect absorption refrigerator according to still another embodiment of the present invention. In the drawing, those having the same reference numerals as those in FIG. 2 or FIG. 5 are the same parts, and the description thereof is omitted. 4 differs from the embodiment of FIG. 2 in that the amount of the concentrated solution flowing back from the high-temperature regenerator 8 to the absorber 5 through the concentrated solution pipe 13 is detected by the high-temperature regenerator temperature measured by the thermometer 25. Then, the solution circulation amount control is performed by opening and closing the flow control valve 23 according to a command from the control device 15. According to the embodiment of FIG. 4, the same effects as those of the previous embodiments can be obtained.

[0018]

As described above in detail, according to the present invention, control of the circulation amount of the solution is realized without particularly requiring a large-scale device, and excellent operation characteristics from a high load to a partial load region are obtained. A double-effect absorption refrigerator can be provided. In addition, since the change in load is detected based on the internal cycle amount, a control system that matches the time constant of the machine is configured even in the transition period of the external load change.

[Brief description of the drawings]

FIG. 1 is a cycle diagram of a double effect absorption refrigerator according to one embodiment of the present invention.

FIG. 2 is a cycle system diagram of a double effect absorption refrigerator according to another embodiment of the present invention.

FIG. 3 is a cycle diagram of a double-effect absorption refrigerator according to still another embodiment of the present invention.

FIG. 4 is a cycle system diagram of a double-effect absorption refrigerator according to still another embodiment of the present invention.

FIG. 5 is a cycle diagram of a general double-effect absorption refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporator 2 Refrigerant pump 5 Absorber 6 Solution pump 7 Solution heat exchanger 8 High temperature regenerator 9 Low temperature regenerator 10 Condenser 11,11A, 11B, 12,12A Dilute solution piping 13,13A, 14 Concentrated solution piping 15 Control Apparatus 20 Float valve 21 Float chamber 22 Flow meter 23 Flow control valve 24 Pressure gauge 25 Thermometer

Claims (1)

(57) [Claims] An evaporator, an absorber, a condenser, a high-temperature regenerator,
Low temperature regenerator, solution heat exchanger, solution pump, refrigerant pump,
And a piping system that operatively connects these devices,
In an absorption refrigerator configured to send a dilute solution from an absorber to a high-temperature regenerator and a low-temperature regenerator in parallel, measure the amount of concentrated solution in the solution circulation system that returns from the high-temperature regenerator to the absorber. A flow meter and a flow control valve that opens and closes according to the measurement result of the flow meter are provided in the solution circulation system, and the liquid is sent from the absorber to both the high-temperature and low-temperature regenerators according to the valve opening of the flow control valve. A double-effect absorption refrigerator characterized by controlling the circulation amount of a dilute solution.