JPH0566481U - Absorption refrigerator regenerator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a regenerator for an absorption chiller, which prevents vibration of the regenerator at startup of operation of the absorption chiller, and thus prevents reduction in life of the regenerator. [Structure] The heat of the exhaust gas generated during the operation of the absorption refrigerator is absorbed in the heat medium that has exchanged heat with the heat of the exhaust gas in the exhaust gas heat exchanger 21 provided in the exhaust pipe 15, and this heat is absorbed. The medium is stored in the heat storage tank 24, and the heat medium stored in the heat storage tank 24 is supplied to the regenerator 10 to preheat the solution in the regenerator before the start of the operation of the absorption refrigerator, and the solution temperature is set to a predetermined value. A regenerator for an absorption refrigerating machine, characterized in that combustion of the regenerator 10 is started after reaching the temperature.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a regenerator for an absorption refrigerator, and more particularly to a regenerator for an absorption refrigerator in which the heat of exhaust gas is used to preheat the regenerator.

[0002]

[Prior Art]

 Before explaining a conventional regenerator for an absorption refrigerator, an outline of the absorption refrigerator will be described with reference to FIG. In FIG. 2, the high temperature regenerator 1 has a combustion chamber housed therein, and absorbs the refrigerant to heat the dilute solution having a low concentration, and produces refrigerant vapor from the dilute solution. The separator 2 evaporates the refrigerant vapor to separate the concentrated intermediate solution having a high concentration from the refrigerant vapor, and sends the former to the high temperature solution heat exchanger 7 and the latter to the low temperature regenerator 3. The low temperature regenerator 3 reheats the intermediate concentrated solution whose temperature has been lowered by the high temperature solution heat exchanger 7 with the refrigerant vapor coming from the separator 2, and further generates the refrigerant vapor from the intermediate concentrated solution, which is condensed. The refrigerant is sent to the compressor 4 and the intermediate concentrated solution itself is made into a concentrated solution, and the refrigerant vapor coming from the separator 2 is partially condensed to be a refrigerant liquid and sent to the condenser 4. The condenser 4 liquefies the refrigerant vapor generated in the low-temperature regenerator 3 and the refrigerant vapor that has not become the refrigerant liquid in the low-temperature regenerator 3 by using cooling water to form a refrigerant liquid and send it to the evaporator 5. The evaporator 5 is provided with a heat transfer tube (cooler) 5A in which circulating water to be cooled flows, and the refrigerant liquid sent from the condenser 4 is sprayed to the heat transfer tube 5A by using the sprayer 5B, and the refrigerant is cooled. The circulating water is cooled using the heat of vaporization when the liquid becomes refrigerant vapor. In the absorber 6, the concentrated solution that has passed through the low temperature heat exchanger 8 from the low temperature regenerator 3 is introduced and sprayed and dropped using the sprayer 6B provided at the upper part, and this concentrated solution is vaporized in the evaporator 5. Absorbs the generated refrigerant vapor. A high vacuum is secured in the evaporator 5 by the absorbing action of the absorber 6, and the refrigerant liquid sprinkled on the heat transfer tube 5A in the evaporator 5 can be immediately evaporated. Further, the absorber 6 is provided with a cooling means 6A for cooling when the concentrated solution absorbs the refrigerant vapor and becomes a diluted solution. The high temperature solution heat exchanger 7 performs heat exchange between the high temperature intermediate concentrated solution and the low temperature diluted solution, and the low temperature heat exchanger 8 performs heat exchange between the high temperature concentrated solution and the low temperature diluted solution. In order to improve the heat exchange efficiency, two stages are provided on the high temperature side and the low temperature side. The solution circulation pump 9 absorbs the refrigerant vapor in the absorber 6 to form a dilute solution, and sends the diluted solution to the high temperature regenerator 1 via the low temperature solution heat exchanger 8 and the high temperature solution heat exchanger 7 to circulate it again. It is provided.

The present invention relates to a high temperature regenerator 1 for such an absorption refrigerator, which will be described in detail below. In the following, the high temperature regenerator will be simply referred to as the regenerator. The conventional regenerator has the configuration shown in FIG. In FIG. 3, reference numeral 10 indicates a regenerator, which is a regenerator body 11, a regenerator inlet 12, a regenerator outlet 13, a combustion chamber 14 formed inside the regenerator body 11, and the combustion chamber 1 4 and a burner 16 provided in the combustion chamber 14. Gas for combustion is supplied to the burner 16 via a pipe 17 and a burner source cock 18 provided in the pipe 17, and at the same time, the blower 19 passes through the duct 20 as indicated by a solid arrow. Air is sent in.

Such a regenerator 10 operates as follows. When the combustion gas is supplied to the burner 16 from the pipe 17 and the air is sent from the blower 19 through the duct 20 to ignite the burner 16, combustion is started in the combustion chamber 14 to generate combustion gas. This combustion gas heats the solution in the regenerator body 11 while moving as shown by the dotted arrow. Then, the gas that has finished heating is discharged from the exhaust stack 15. On the other hand, the (rare) solution that has passed through the high temperature solution heat exchanger 7 is introduced into the regenerator body 11 from the regenerator inlet 12, and this solution moves while being heated by the combustion gas in the regenerator body 11. Is sent from the regenerator outlet 13 and sent to the separator 2.

[0005]

[Problems to be solved by the device]

 However, in such a conventional absorption refrigerator, when the absorption refrigerator is operated, the regenerator body 11 is directly burnt and heated by the burner 16. In this case, when the temperature inside the regenerator 10 is sufficiently lowered to the outside air temperature at the start-up of the operation, when the combustion gas is directly added to the regenerator heat exchange section to heat it, the inside of the regenerator body 11 boils. Thermal stress may occur between the high temperature side and the low temperature side of the heat exchange section in the regenerator, causing vibration in the regenerator 10. This is also considered to be a factor that promotes the shortening of the life of the heat exchanger, and measures to prevent this have become necessary.

The present invention has been made to solve the above problems, and its purpose is to prevent the regenerator from vibrating at the start of operation of the absorption refrigerator, thereby preventing the life of the regenerator from being shortened. It is to provide a regenerator for a refrigerator.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the regenerator of the absorption refrigerator according to the present invention has the following configuration. That is, the heat of the exhaust gas generated during operation of the absorption chiller is absorbed by the heat medium that has exchanged heat with the heat of the exhaust gas in the exhaust gas heat exchanger installed in the exhaust stack, and this heat medium stores heat. Before the start of operation of the absorption chiller, the heat medium stored in this heat storage tank is supplied to the regenerator to preheat the solution in the regenerator so that the solution temperature reaches a predetermined temperature. It is characterized in that the combustion of the regenerator is started after the arrival.

[0008]

[Action]

 According to the above configuration, the heat of the exhaust gas generated during the operation of the absorption refrigerator is absorbed by the heat medium that has exchanged heat with the heat of the exhaust gas in the exhaust gas heat exchanger provided in the exhaust stack, and This heat medium is stored in the heat storage tank, and before the start of operation of the absorption refrigerator, the heat medium stored in this heat storage tank is supplied to the regenerator to preheat the solution in the regenerator, and the solution temperature is adjusted. Since the combustion of the regenerator is started after the temperature reaches a constant temperature, when the heat exchange part of the regenerator is directly heated by the combustion gas, the regenerator has already reached the predetermined temperature or higher and the thermal stress Is less likely to occur and the regenerator does not vibrate.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of the present invention, and the same members as those in FIG. 3 are designated by the same reference numerals. In FIG. 1, reference numeral 10 indicates a regenerator. The regenerator 10 includes a regenerator body 11, a regenerator inlet 12, a regenerator outlet 13, a combustion chamber 14 formed inside the regenerator body 11, and the combustion chamber. It is composed of an exhaust stack 15 connected to the chamber 14 and a burner 16 provided in the combustion chamber 14, and the burner 16 is provided with a pipe 17 provided with a burner source cock 18 for combustion. Along with the supply of gas, air is blown from the blower 19 through the duct 20 as indicated by the solid arrow. This point is similar to the conventional regenerator shown in FIG. In the present embodiment, an exhaust gas heat exchanger 21 is provided in the exhaust stack 15 in order to further utilize the heat of the exhaust gas, and the exhaust gas heat exchanger 21 exchanges heat between the heat medium and the heat of the exhaust gas. The heat medium absorbs the heat of the exhaust gas. The heat medium that has absorbed the heat passes through the pipe 22 and is stored in the heat storage material 25 arranged in the heat storage tank 24 through the check valve 23. As the heat storage material 25, for example, water, paraffin, sodium hydroxide or the like can be used. Water or methanol is used as a heat medium and is circulated by a pump 27 provided in the pipe 26. A three-way valve 28 provided downstream of the pipe 26 and one exhausted by a pipe 29. It is connected to the gas heat exchanger 21, and the other end is fed to the bottom of the regenerator body 11 by a pipe 30. At the bottom of the regenerator body 11, before the operation of the absorption refrigerator is started, the heat stored in the heat medium is applied to the solution so that the solution can be heated in advance. The heat medium that has finished heating the solution passes through the pipe 31 and returns to the heat storage material 25 in the heat storage tank 24 through the check valve 32. The pump 27 and the three-way valve 28 are controlled by a control box 33 by a signal from a controller 34. Further, a temperature sensor 35 is provided in the heat storage material 25, and when the heat medium is circulated so as to be sent to the bottom of the regenerator body 11, the temperature of the solution is a predetermined temperature (for example, about 70 ° C.). The temperature sensor 35 is controlled by the control box 33, although it is confirmed whether the temperature has reached the above.

Next, the operation of the regenerator 10 will be described. Before the start of the operation of the absorption chiller, the heat medium stored in this heat storage tank is circulated by the pump 27 through the pipes 26 and 30 through the three-way valve 28 in the direction indicated by the chain double-dashed line arrow to regenerator body. The solution in the regenerator body 11 is preheated by supplying the solution to the bottom of 11. The heat medium used for heating returns to the heat storage material 25 in the heat storage tank 24 through the pipe 31 and the check valve 32. When the temperature sensor 35 detects that the solution in the regenerator body 11 has reached a predetermined temperature, for example, about 70 ° C. due to the circulation of the heat medium, the control box 33 gives an instruction to the burner 16 to ignite, Combustion gas is supplied to the burner 16 from the pipe 17, air is blown from the blower 19 through the duct 20 as indicated by the solid arrow, and the burner 16 is ignited. When the burner 16 is ignited, combustion is started in the combustion chamber 14 to generate combustion gas. This combustion gas heats the solution in the regenerator body 11 while moving as shown by the dotted arrow. Then, the gas that has finished heating is discharged from the exhaust stack 15. On the other hand, the solution circulation pump 9 starts to operate in the regenerator main body 11 and the solution that has passed through the high temperature solution heat exchanger 7 is introduced from the regenerator main body 11 and the solution is stored in the regenerator main body 11 with the combustion gas. Is moved while being heated by and is sent out from the regenerator outlet 13 and sent to the separator 2. In this case, since the solution in the regenerator main body 11 is preheated, the regenerator 10 is also heated to a predetermined temperature or higher, thermal stress is less likely to occur, and vibration does not occur. When the absorption refrigerator is in the normal operating state in this way, the control box 33 outputs a control signal to switch the three-way valve 28, and the heat medium passes through the pipe 29 and the exhaust gas heat exchanger provided in the exhaust stack 15. It circulates in the direction of 21 (the direction indicated by the two-dot chain line arrow). The heat medium sent to the exhaust gas heat exchanger 21 absorbs the heat of the exhaust gas here and returns to the heat storage material 25 in the heat storage tank 24 through the pipe 22 and the check valve 23. By circulating the heat medium in this way, the heat medium that has absorbed the heat of the exhaust gas is stored in the heat storage material 25 arranged in the heat storage tank 24 when the absorption refrigerator is in the normal operating state. I have to.

[0011]

[Effect of the device]

 As explained above, according to the present invention, the heat of the exhaust gas generated during the operation of the absorption refrigerator is exchanged with the heat of the exhaust gas by the exhaust gas heat exchanger provided in the exhaust stack. The heat medium is absorbed by the heat medium, and this heat medium is stored in the heat storage tank, and the heat medium stored in this heat storage tank is supplied to the regenerator before the startup of the operation of the absorption refrigerator, and the solution in the regenerator is discharged. Since the heating of the regenerator is started in advance after the solution temperature reaches the prescribed temperature, the regenerator is already heated above the prescribed temperature when the heat exchange part of the regenerator is directly heated by the combustion gas. As a result, the thermal stress is low and the regenerator does not vibrate. As a result, it is possible to prevent the life of the regenerator from being shortened. This also has the effect of shortening the start-up of the operation and saving energy.

[Brief description of drawings]

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

FIG. 2 shows a system diagram of an absorption refrigerator.

FIG. 3 shows a schematic configuration diagram of a regenerator of a conventional absorption refrigerator.

[Explanation of symbols]

 10 Regenerator 11 Regenerator Main Body 12 Regenerator Inlet 13 Regenerator Outlet 14 Combustion Chamber 15 Exhaust Cylinder 16 Burner 17 Pipe 18 Burner Original Cock 19 Blower 20 Duct 21 Exhaust Gas Heat Exchanger 22, 26, 29, 30, 31, Pipe 23, 32, check valve 24 heat storage tank 25 heat storage material 27 pump 28 three-way valve 33 control ball box 34 controller 35 temperature sensor

Claims (1)

[Scope of utility model registration request] 1. The heat of exhaust gas generated during operation of an absorption refrigerator is absorbed by a heat medium that has exchanged heat with the heat of the exhaust gas in an exhaust gas heat exchanger provided in an exhaust stack, and this heat is absorbed. The medium is stored in the heat storage tank, and before the start of operation of the absorption refrigerator, the heat medium stored in this heat storage tank is supplied to the regenerator to preheat the solution in the regenerator, and the solution temperature is set to a predetermined value. A regenerator for an absorption chiller, characterized in that combustion of the regenerator is started after the temperature is reached.