JP2007232271A - Triple effect absorption refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a triple effect absorption refrigerating machine which suppresses a temperature of a solution to be sucked by a pump while suppressing rising of a temperature and a pressure of a high temperature regenerator. <P>SOLUTION: The triple effect absorption refrigerating machine is provided with: an absorber A producing a dilute solution Sw with a lower concentration from a solution S; a low temperature regenerator G1 producing a low temperature concentrated solution Sh1 with a higher concentration by heating the dilute solution Sw and evaporating coolant; a middle temperature regenerator G2 heating the dilute solution Sw, evaporating the coolant at a temperature higher than in the low temperature regenerator G1, and raising the concentration; the high temperature regenerator G3 heating the low temperature concentrated solution Sh1, evaporating the coolant at a temperature higher than in the middle temperature regenerator G2, and raising the concentration; a middle temperature solution pump 12 sending the dilute solution Sw in the absorber A to the middle temperature regenerator G2; and a high temperature solution pump 13 sending the low temperature concentrated solution Sh1 in the low temperature regenerator G1 to the high temperature regenerator G3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a triple effect absorption refrigerator, and more particularly to a triple effect absorption refrigerator that can improve the durability of a pump while suppressing an increase in temperature and pressure of a high-temperature regenerator.

  In recent years, there has been concern about the impact of a significant increase in energy consumption on the environment while increasing awareness of global environmental conservation. Today, when the so-called Kyoto Protocol comes into effect, it is an urgent task to promote further energy conservation in order to achieve the greenhouse gas reduction targets set in each country. Under such circumstances, triple-effect absorption refrigerators with higher energy savings are expected to be widely used as absorption refrigerators widely used in offices and buildings mainly for commercial use.

  Triple-effect absorption refrigerators are generally known to have three different regenerators, high temperature regenerator, medium temperature regenerator, and low temperature regenerator in descending order of operating temperature, and have a series flow or branch flow solution cycle. It has been. In the series flow, the diluted solution of the absorber is sent to the high temperature regenerator, the first concentrated solution obtained by concentrating the diluted solution with the high temperature regenerator is sent to the intermediate temperature regenerator, and the first concentrated solution is sent with the intermediate temperature regenerator. Is a solution cycle in which the second concentrated solution obtained by concentrating the liquid is sent to a low-temperature regenerator, and the third concentrated solution obtained by concentrating the second concentrated solution in the low-temperature regenerator is sent to the absorber (see FIG. 12). . In the branch flow, the dilute solution in the absorber is sent in parallel to the high-temperature regenerator, medium-temperature regenerator, and low-temperature regenerator. This is a solution cycle in which three concentrated solutions of the concentrated second concentrated solution and the third concentrated solution obtained by concentrating the dilute solution with a low-temperature regenerator are combined and sent to the absorber (see FIG. 13).

However, the triple effect absorption refrigeration machine having the above-described series flow solution cycle is disadvantageous in terms of strength as a pressure vessel because the pressure of the high temperature regenerator tends to be high, and the triple effect absorption refrigeration having the above branch flow solution cycle. Since the temperature of the high-temperature regenerator tends to be high and there is a problem of corrosion due to high temperature, in order to solve these problems, the absorber dilute solution is sent in parallel to the medium-temperature regenerator and the low-temperature regenerator, An appropriate amount of the second concentrated solution obtained by concentrating the dilute solution in the intermediate temperature regenerator is fed to the high temperature regenerator, and the first concentrated solution obtained by concentrating the second concentrated solution in the high temperature regenerator is diluted with the intermediate temperature regenerator. Triple effect absorption refrigeration having a solution cycle in which the remaining of the second concentrated solution obtained by concentrating the solution, the three concentrated solutions of the third concentrated solution obtained by concentrating the diluted solution in the low temperature regenerator are combined and sent to the absorber. Machines were developed (eg patent literature) Reference).
JP 2000-154945 A (FIG. 1 etc.)

  However, the triple effect absorption refrigerator described in Patent Document 1 described above can suppress the increase in temperature and pressure of the high-temperature regenerator, but the durability of the pump for feeding liquid from the medium-temperature regenerator to the high-temperature regenerator is improved. Had an influence.

  In view of the above problems, an object of the present invention is to provide a triple effect absorption refrigerator that can improve the durability of a pump while suppressing an increase in temperature and pressure of a high temperature regenerator.

  In order to achieve the above object, a triple effect absorption refrigerator according to the invention described in claim 1 absorbs refrigerant vapor Vs with a solution S, for example, as shown in FIG. Absorber A as solution Sw; Low-temperature regenerator G1 that introduces dilute solution Sw from absorber A and heats the dilute solution Sw to evaporate the refrigerant to increase the concentration of the low-temperature concentrated solution Sh1; A medium temperature regenerator G2 that evaporates the refrigerant at a higher temperature than in the low temperature regenerator G1 by introducing the dilute solution Sw from the regenerator A and heating the dilute solution Sw; and a low temperature concentration from the low temperature regenerator G1 A high-temperature regenerator G3 that introduces the solution Sh1 and heats the low-temperature concentrated solution Sh1 to evaporate the refrigerant at a higher temperature than in the intermediate-temperature regenerator G2, thereby increasing the concentration; and the dilute solution Sw in the absorber A Regenerator G2 A medium temperature solution pump 12 for feeding; and a hot solution pump 13 for feeding a cold concentrated solution Sh1 within the low temperature generator G1 to the high temperature regenerator G3.

  With this configuration, since the high-temperature solution pump for feeding the low-temperature concentrated solution in the low-temperature regenerator to the high-temperature regenerator is provided, the high-temperature solution pump sends the low-temperature concentrated solution whose temperature is lower than that of the medium-temperature concentrated solution to the high-temperature regenerator. As a result, the temperature of the solution sucked by the high temperature solution pump can be suppressed while suppressing an increase in temperature and pressure of the high temperature regenerator, and the durability of the high temperature solution pump can be improved.

  Moreover, the triple effect absorption refrigerator according to the invention described in claim 2 is the triple effect absorption refrigerator 1 according to claim 1, wherein the low-temperature regenerator G1 is a low-temperature concentrate, as shown in FIGS. A low temperature regenerator solution reservoir 21 for storing the solution Sh1 is provided, and a high temperature solution pump 13 is disposed in a low temperature concentrated solution flow path 43 that guides the low temperature concentrated solution Sh1 from the low temperature regenerator solution reservoir 21 to the high temperature regenerator G1; The regenerator G2 has a medium temperature regenerator solution reservoir 22 that accumulates the medium temperature concentrated solution Sh2 whose concentration has been increased by evaporating the refrigerant from the dilute solution Sw; the high temperature regenerator G3 evaporates the refrigerant from the low temperature concentrated solution Sh1 and has a concentration A high temperature regenerator solution reservoir 85 for storing the elevated high temperature concentrated solution Sh3; the liquid level of the high temperature concentrated solution Sh3 in the high temperature regenerator solution reservoir 85 or in the main body of the high temperature regenerator G3 is a first predetermined liquid level The discharge amount of the high temperature solution pump 13 is adjusted so that the liquid level of the medium temperature concentrated solution Sh2 in the intermediate temperature regenerator solution reservoir 22 or in the main body of the intermediate temperature regenerator G2 is the second predetermined liquid level height. And a control device 60 for adjusting the discharge amount of the intermediate temperature solution pump 12.

  With this configuration, the high temperature solution pump is disposed in the low temperature concentrated solution flow path that guides the low temperature concentrated solution from the low temperature regenerator solution reservoir to the high temperature regenerator, thereby avoiding failure of the high temperature solution pump due to cavitation or the like. It becomes easy to do. In addition, the discharge amount of the high temperature solution pump is adjusted so that the liquid level of the high temperature concentrated solution in the high temperature regenerator solution reservoir or in the main body of the high temperature regenerator becomes the first predetermined liquid level, and the medium temperature regenerator Since the discharge amount of the intermediate temperature solution pump is adjusted so that the intermediate temperature concentrated solution in the solution reservoir or in the main body of the intermediate temperature regenerator has the second predetermined liquid level, the high temperature concentrated solution and the intermediate temperature regeneration in the high temperature regenerator are adjusted. The medium-temperature concentrated solution in the chamber is not discharged by being mixed with the refrigerant evaporated in each regenerator.

  Further, the triple effect absorption refrigerator according to the invention described in claim 3 is the pressure in the high temperature regenerator G3 in the triple effect absorption refrigerator 1 described in claim 2, for example, as shown in FIGS. A high temperature pressure detector 63 for detecting the high temperature liquid level detector 66A to 66D for detecting the high level liquid level and the low level liquid level of the high temperature concentrated solution Sh3 in the high temperature regenerator solution reservoir 85 or in the main body of the high temperature regenerator G3; A medium temperature pressure detector 62 for detecting the pressure in the medium temperature regenerator G2, and a medium temperature for detecting the high and low liquid levels of the medium temperature concentrated solution Sh2 in the medium temperature regenerator solution reservoir 22 or in the main body of the medium temperature regenerator G2. A liquid level detector 65; the control device 60 adjusts the rotational speed of the high temperature solution pump 13 based on the pressure detected by the high temperature pressure detector 63, and the high temperature liquid level detector 66D (66A to 66C) Detect high liquid level When the lower liquid level is detected, the intermediate temperature liquid level detector 65 is adjusted to adjust the rotation speed of the intermediate temperature solution pump 12 based on the pressure detected by the intermediate temperature pressure detector 62. It is configured to be lowered when a surface is detected and raised when a lower liquid level is detected.

  With this configuration, in the high-temperature regenerator and the medium-temperature regenerator, the rotation speed of the corresponding solution pump is adjusted with reference to the pressure in each regenerator, so that the solution reservoir of each regenerator or the main body of each regenerator Since the rotation speed of the corresponding solution pump is corrected by the liquid level, the stability of the solution liquid level in each regenerator is increased.

  In addition, the triple effect absorption refrigerator according to the invention described in claim 4 is the same as the triple effect absorption refrigerator 1 described in claim 3, for example, as shown in FIG. ), A high-temperature refrigerant temperature detector 69 for detecting the temperature of the high-temperature condensed refrigerant Vf3 condensed by the refrigerant evaporated by heating the low-temperature concentrated solution Sh1 in the high-temperature regenerator G3; In place of (see FIG. 1), a medium temperature refrigerant temperature detector 68 for detecting the temperature of the medium temperature condensed refrigerant Vf2 in which the refrigerant evaporated by heating the diluted solution Sw in the medium temperature regenerator G2 is condensed is provided; Instead of the pressure detected by the high-temperature pressure detector 63 (for example, see FIG. 2), the rotational speed of the high-temperature solution pump 13 is adjusted based on the temperature detected by the high-temperature refrigerant temperature detector 69, and the medium-temperature pressure detector 62 (for example, FIG. 2). 1) Is configured to adjust the rotational speed of the medium temperature solution pump 12 based on the temperature detected by the medium-temperature refrigerant temperature detector 68 instead of the pressure that knowledge.

  With this configuration, the rotational speeds of the corresponding solution pumps are adjusted based on the temperatures of the high-temperature condensing refrigerant and the intermediate-temperature condensing refrigerant that have a correlation with the pressure in the high-temperature regenerator and the intermediate-temperature regenerator, and the solution reservoirs of each regenerator are adjusted. Since the rotation speed of the corresponding solution pump is corrected by the liquid level, the stability of the solution liquid level in each regenerator is increased.

  Further, the triple effect absorption refrigerator according to the invention described in claim 5 is a low-temperature low-temperature absorption refrigerator 1 according to any one of claims 2 to 4, for example, as shown in FIG. Dilute solution introduction amount adjusting means for adjusting the flow rate of the dilute solution Sw introduced into the low temperature regenerator G1 so that the liquid level of the low temperature concentrated solution Sh1 in the regenerator solution reservoir 21 is equal to or higher than the third predetermined liquid level. 16, 60, 64.

  If comprised in this way, it can avoid more reliably that a high temperature solution pump fails by cavitation etc.

  Moreover, the triple effect absorption refrigerator according to the invention described in claim 6 is the triple effect absorption refrigerator according to claim 5, for example, as shown in FIG. A flow rate adjusting valve 16 that adjusts the flow rate of the dilute solution Sw that flows in the dilute solution flow channel 41, and a low temperature regenerator solution reservoir, which is disposed in the dilute solution flow channel 41 that guides the dilute solution Sw from A to the low temperature regenerator G1. The low-temperature liquid level detector 64 that detects whether or not the liquid level of the low-temperature concentrated solution Sh1 in the 21 is equal to or higher than a third predetermined liquid level, and the low-temperature concentrated solution Sh1 in the low-temperature regenerator solution reservoir 21 And a control device 60 that increases the opening of the flow regulating valve 16 when the liquid level falls below a third predetermined liquid level.

  If comprised in this way, it can avoid more reliably that a high temperature solution pump fails by cavitation etc. with a simple structure.

  In addition, the triple effect absorption refrigerator according to the invention described in claim 7 is the triple effect absorption refrigerator according to claim 5, for example, as shown in FIG. The liquid level of the low-temperature concentrated solution Sh1 in the low-temperature regenerator solution reservoir 21 and the low-temperature solution pump 15 different from the medium-temperature solution pump 12 that sends the dilute solution Sw in A to the low-temperature regenerator G1 are the third predetermined level. The liquid level of the low-temperature concentrated solution Sh1 in the low-temperature regenerator solution reservoir 21 is lower than the third predetermined liquid level height. The controller 60 is sometimes configured to increase the rotational speed of the low temperature solution pump 15.

  If comprised in this way, the introduction amount of the dilute solution to a low-temperature regenerator can be adjusted, without accompanying an excessive pressure loss.

  According to the triple effect absorption refrigerator according to the present invention, since the high-temperature solution pump for feeding the low-temperature concentrated solution in the low-temperature regenerator to the high-temperature regenerator is provided, the high-temperature solution pump has a lower temperature than the medium-temperature concentrated solution. The solution will be sent to the high temperature regenerator, and the temperature of the solution sucked by the high temperature solution pump can be suppressed while suppressing an increase in temperature and pressure of the high temperature regenerator, and the durability of the high temperature solution pump can be improved. it can.

Embodiments of the present invention will be described below with reference to the drawings. In each figure, the same or corresponding devices are denoted by the same or similar reference numerals, and redundant description is omitted. 1 to 5 (excluding FIG. 2B), a broken line represents a control signal.
First, the configuration of a triple effect absorption refrigerator 1 (hereinafter simply referred to as “absorption refrigerator 1”) according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic system diagram showing an absorption refrigerator 1 according to an embodiment of the present invention. The absorption refrigerator 1 includes an absorber A, a low temperature regenerator G1, an intermediate temperature regenerator G2, a high temperature regenerator G3, a condenser C, an evaporator E, an intermediate temperature solution pump 12, and a high temperature solution pump 13. The low-temperature solution heat exchanger 31, the intermediate-temperature solution heat exchanger 32, the high-temperature solution heat exchanger 33, and the control device 60 are provided.

  The absorber A is a device that causes the solution S to absorb the refrigerant vapor Vs generated in the evaporator E. Typically, water is used as the refrigerant and lithium bromide (LiBr) is used as the solution S. However, the present invention is not limited to this, and other refrigerants and solutions (absorbents) may be used in combination. The absorber A is provided with a cooling water pipe 71 for flowing cooling water q that takes away the heat of absorption generated when the solution S absorbs the refrigerant vapor Vs. Further, in the absorber A, a concentrated solution spraying nozzle 72 that sprays the solution S having a high concentration regenerated by the regenerators G1 to G3 is disposed above the cooling water pipe 71. The lower part of the absorber A is a storage unit 73 that stores the diluted solution Sw having a reduced concentration by absorbing the refrigerant vapor Vs. The reservoir 73 is connected to a dilute solution outlet tube 42 that guides the dilute solution Sw toward the low temperature regenerator G1 and the intermediate temperature regenerator G2. The absorber A communicates with the evaporator E at the top, and is configured so that the refrigerant vapor Vs evaporated by the evaporator E can be introduced into the absorber A.

  The low temperature regenerator G1 is a device that introduces the dilute solution Sw from the absorber A and heats the dilute solution Sw to evaporate the refrigerant to increase the concentration. A dilute solution spray nozzle 51a for spraying the introduced dilute solution Sw is disposed in the upper part of the low temperature regenerator G1. The low temperature regenerator G1 is provided with a heating steam pipe 51 for flowing a refrigerant vapor Vm as a heating source for heating the diluted solution Sw below the diluted solution spray nozzle 51a. The portion where the heating steam pipe 51 is disposed is referred to as a main body of the low temperature regenerator G1. In the heating steam pipe 51, a refrigerant vapor in which a medium temperature refrigerant vapor Vs2 evaporated in the medium temperature regenerator G2 and a high temperature condensed refrigerant Vf3 in which the high temperature refrigerant vapor Vs3 evaporated in the high temperature regenerator G3 is condensed in the medium temperature regenerator G2 are mixed. Vm is introduced. The low-temperature regenerator G1 communicates with the condenser C at the top, and is configured such that the low-temperature refrigerant vapor Vs1 evaporated from the dilute solution Sw by the heat of the refrigerant vapor Vm can move to the condenser C.

  Further, the low temperature regenerator G1 is provided with a low temperature regenerator solution reservoir 21 for storing a low temperature concentrated solution Sh1 whose concentration has been increased by evaporation of the refrigerant from the dilute solution Sw. The low-temperature regenerator solution reservoir 21 is typically formed integrally with the low-temperature regenerator G1 by being partitioned by an overflow weir 21a at the lower part of the low-temperature regenerator G1, and has a predetermined volume, for example. Even if the tank is physically separated from the low temperature regenerator G1 and connected by piping, it is assumed to be a part of the low temperature regenerator G1. Further, the low temperature regenerator solution reservoir 21 may not be a tank shape but may be a pipe. When the low-temperature regenerator solution reservoir 21 is integrated with the low-temperature regenerator G1, the main body of the low-temperature regenerator G1 may also serve as the low-temperature regenerator solution reservoir 21. The low temperature regenerator solution reservoir 21 is provided with a liquid level sensor 64 as a low temperature liquid level detector for detecting the liquid level of the low temperature concentrated solution stored therein. For the liquid level sensor 64, an electrode rod is typically used. A signal cable is laid between the liquid level sensor 64 and the control device 60, respectively, so that the detected liquid level signal can be transmitted to the control device 60. The liquid level sensor 64 may be a float switch other than the electrode rod. The low temperature regenerator solution reservoir 21 is connected to a low temperature concentrated solution tube 43 that forms a low temperature concentrated solution flow path that guides the low temperature concentrated solution Sh1 to the high temperature regenerator G3. Further, a low temperature concentrated solution outlet pipe 44 for extracting the low temperature concentrated solution Sh1 is connected to the lower part of the low temperature regenerator G1 downstream of the low temperature regenerator solution reservoir 21 (downstream of the overflow weir 21a). The low temperature concentrated solution outlet tube 44 is connected to the concentrated solution spray nozzle 72 of the absorber A through the low temperature solution heat exchanger 31.

  The intermediate temperature regenerator G2 is a device that evaporates the refrigerant at a temperature higher than that in the low temperature regenerator G1 by introducing the dilute solution Sw from the absorber A and heating the dilute solution Sw, thereby increasing the concentration. A dilute solution spray nozzle 52a for spraying the introduced dilute solution Sw is disposed in the upper part of the intermediate temperature regenerator G2. The intermediate temperature regenerator G2 is provided with a heating steam pipe 52 for flowing a refrigerant vapor Vs3 as a heating source for heating the diluted solution Sw below the diluted solution spray nozzle 52a. The portion where the heating steam pipe 52 is disposed is referred to as a main body of the intermediate temperature regenerator G2. The high-temperature refrigerant vapor Vs3 evaporated by the high-temperature regenerator G3 is introduced into the heating vapor pipe 52. Connected to the heating steam pipe 52 is a high-temperature condensing refrigerant pipe 56 through which the high-temperature condensing refrigerant Vf3 condensed by the high-temperature refrigerant vapor Vs3 deprived of heat by the dilute solution Sw. In addition, an intermediate temperature refrigerant vapor pipe 55 is connected to the upper part of the intermediate temperature regenerator G2 for deriving the intermediate temperature refrigerant vapor Vs2 evaporated from the dilute solution Sw by the heat of the high temperature refrigerant vapor Vs3. The intermediate temperature refrigerant vapor pipe 55 is connected to the heating vapor pipe 51 of the low temperature regenerator G1. In addition, a high temperature condensing refrigerant pipe 56 is connected to the intermediate temperature refrigerant vapor pipe 55 in the middle. The intermediate temperature regenerator G2 is provided with a pressure sensor 62 as a pressure detector that detects the pressure in the intermediate temperature regenerator G2. Since the pressure sensor 62 only needs to be able to detect the pressure in the intermediate temperature regenerator G2, the pressure sensor 62 may be provided in the intermediate temperature refrigerant vapor pipe 55 in the vicinity of the intermediate temperature regenerator G2. The pressure sensor 62 is connected to the control device 60 via a signal cable, and is configured to be able to transmit the pressure signal detected by the pressure sensor 62 to the control device 60.

  Further, the intermediate temperature regenerator G2 is provided with an intermediate temperature regenerator solution reservoir 22 for storing an intermediate temperature concentrated solution Sh2 whose concentration has increased due to evaporation of the refrigerant from the dilute solution Sw. The intermediate temperature regenerator solution reservoir 22 is typically formed integrally with the intermediate temperature regenerator G2 below the intermediate temperature regenerator G2. For example, a tank having a predetermined volume is physically formed from the intermediate temperature regenerator G2. It is assumed that it is a part of the medium temperature regenerator G2 even if it is formed by connecting by piping. Further, the intermediate temperature regenerator solution reservoir 22 may be a pipe instead of a tank-like shape. When the intermediate temperature regenerator solution reservoir 22 is integrated with the intermediate temperature regenerator G2, the main body of the intermediate temperature regenerator G2 may also serve as the intermediate temperature regenerator solution reservoir 22. The liquid surface height of the intermediate temperature regenerator solution reservoir 22 is controlled by the pressure in the intermediate temperature regenerator G2, the temperature and concentration of the dilute solution Sw, and the flow rate of the dilute solution Sw sent to the intermediate temperature regenerator G2 by the intermediate temperature solution pump 12. Is done. The intermediate temperature regenerator solution reservoir 22 is connected to an intermediate temperature concentrated solution outlet tube 45 for extracting the intermediate temperature concentrated solution Sh2. The intermediate temperature concentrated solution outlet tube 45 is connected to the lower temperature concentrated solution outlet tube 44 on the upstream side of the low temperature solution heat exchanger 31 after passing through the intermediate temperature solution heat exchanger 32. The medium temperature regenerator solution reservoir 22 has a medium temperature liquid level having a high liquid level sensor 65H for detecting a high liquid level of the medium warm concentrated solution Sh2 stored therein and a low liquid level sensor 65L for detecting a low liquid level. A detector 65 is provided. Typically, electrode bars are used for the high and low liquid level sensors 65H and 65L. Signal cables are laid between the high level liquid level sensor 65H and the low level liquid level sensor 65L and the control device 60, respectively, so that the detected high level and low level liquid level signals can be transmitted to the control device 60. Has been. The high and low liquid level sensors 65H and 65L may be float switches other than the electrode rods. When the float switch is used, it is possible to detect both the high and low liquid levels with one switch. When the liquid level of the medium temperature regenerator G2 main body is to be controlled, the medium temperature liquid level detector 65 is disposed in the medium temperature regenerator G2 main body.

  The details of the high temperature regenerator G3 will now be described with reference to FIG. FIG. 2 is a detailed view of the high-temperature regenerator G3, where (a) is a longitudinal sectional view and (b) is a plan view of a can body portion. As shown in FIG. 2, the high temperature regenerator G3 is a once-through boiler type regenerator. The high temperature regenerator G3 introduces the low temperature concentrated solution Sh1 from the low temperature regenerator G1 (see FIG. 1) and heats it to evaporate the refrigerant at a higher temperature than in the intermediate temperature regenerator G2 (see FIG. 1). It is a device to raise. The high-temperature regenerator G3 includes an annular header 81, 82 at the upper and lower portions in a cylindrical can body 80, and a large number of heat transfer tubes 83 are annularly arranged between these headers 81, 82. It is provided with a burner 84 as a combustion device in the upper central part, and further with a gas-liquid separator 85 connected to the upper header 81 via a pipe 86. A low temperature concentrated solution pipe 43 is connected to the lower header 82, a high temperature refrigerant vapor pipe 54 is connected to the top of the gas / liquid separator 85, and the bottom of the gas / liquid separator 85 is connected to the lower pipe via a pipe 87. It is connected to the shift 82. A hot concentrated solution outlet pipe 46 is connected to the bottom of the gas-liquid separator 85 in parallel with the pipe 87. Here, the part surrounded by the can body 80 is assumed to be the main body of the high temperature regenerator G3. The gas-liquid separator 85 also serves as a high temperature regenerator solution reservoir. The gas-liquid separator 85 is provided with a pressure sensor 63 as a pressure detector for detecting the pressure in the high temperature regenerator G3. Further, a liquid level detection unit 99C in which the gas phase part and the liquid phase part are communicated with each other is provided on the side surface of the gas-liquid separator 85, and the liquid level detection part 99C is a high-temperature concentrated solution stored therein. A high temperature liquid level detector 66C having a high liquid level sensor 66CH for detecting the high liquid level of Sh3 and a low liquid level sensor 66CL for detecting the low liquid level is provided. Typically, electrode bars are used for the high and low liquid level sensors 66CH and 66CL. The high and low liquid level sensors 66CH and 66CL may be float switches other than the electrode rods. When the float switch is used, it is possible to detect both the high and low liquid levels with one switch. The high-temperature liquid level detector 66C is connected to the control device 60 via a signal cable.

  As a liquid level detector in the high temperature regenerator G3, a high liquid level sensor 66DH for detecting a high liquid level of the hot concentrated solution Sh3 stored in the gas-liquid separator 85 and a low liquid level are detected. A high temperature liquid level detector 66D having a low level liquid level sensor 66DL may be provided. Alternatively, a communication pipe 90 is provided between the upper header 81 and the lower header 82, a liquid level detection unit 99A is provided in the communication pipe 90, and a high liquid level of the hot concentrated solution Sh3 is provided in the liquid level detection unit 99A. A high-temperature liquid level detector 66A having a high-level liquid level sensor 66AH for detecting and a low-level liquid level sensor 66AL for detecting a low level liquid level may be provided, or a high temperature may be provided from the upper header 81 into a specific heat transfer tube 83. A high temperature liquid level detector 66B having a high liquid level sensor 66BH for detecting the high liquid level of the concentrated solution Sh3 and a low liquid level sensor 66BL for detecting the low liquid level may be provided. When the high-temperature liquid level detectors 66A, 66B, and 66D are provided, these are also connected to the control device 60 via signal cables, respectively. The high temperature regenerator G3 may be configured to include any one of the high temperature liquid level detectors 66A to 66D, or may be configured to include any combination or all of these. Typically, the high-temperature liquid level detector 66B is suitable for liquid level detection for preventing overheating of the heat transfer tube 83, and the high-temperature liquid level detectors 66C and 66D are used for mixing the high-temperature concentrated solution Sh3 into the refrigerant vapor Vs3. Therefore, the high-temperature liquid level detectors 66A to 66D are arranged in accordance with the control purpose because they are suitable for liquid level detection for prevention and stable supply of the hot concentrated solution Sh3 to the absorber A (see FIG. 1). It is preferable.

  Here, returning to FIG. 1, the description of the absorption refrigerator 1 will be continued. The condenser C is a device that introduces and condenses the low-temperature refrigerant vapor Vs1 evaporated in the low-temperature regenerator G1 to form a low-temperature condensed refrigerant Vf1. The condenser C is formed in a shell and tube type in one can body together with the low temperature regenerator G1, and a partition wall is provided between the two. The condenser C communicates with the low temperature regenerator G1 at the upper part of the partition wall, and is configured so that the low temperature refrigerant vapor Vs1 can be introduced from the low temperature regenerator G1. Inside the condenser C, a cooling water pipe C1 through which the cooling water q for cooling the low-temperature refrigerant vapor Vs1 and the medium-temperature condensed refrigerant Vf2 is disposed. The condenser C is connected to an intermediate temperature condensed refrigerant pipe 57 for introducing the intermediate temperature condensed refrigerant Vf2 condensed by the low temperature regenerator G1. The condenser C is connected to a low-temperature condensing refrigerant pipe 58 for deriving a refrigerant liquid Vf, which is a mixture of the low-temperature condensing refrigerant Vf1 condensed with the low-temperature refrigerant vapor Vs1 and the cooled intermediate-temperature condensing refrigerant Vf2, toward the evaporator E. Yes.

  The evaporator E is a device that introduces the refrigerant liquid Vf from the condenser C and evaporates the refrigerant liquid Vf with the heat of the medium to be cooled p. Inside the evaporator E, a cold water pipe 74 through which the medium to be cooled p flows is disposed. In the upper part of the cold water pipe 74 in the evaporator E, a refrigerant liquid spraying nozzle 75 for spraying the refrigerant liquid Vf is disposed. The lower part of the evaporator E is a storage part 76 that stores the introduced refrigerant liquid Vf. A circulating refrigerant pipe 59 that guides the stored refrigerant liquid Vf to the upper refrigerant liquid spray nozzle 75 is connected to the storage section 76. The circulating refrigerant pipe 59 is provided with a circulating pump 14 that pumps the refrigerant liquid Vf stored in the storage unit 76 to the refrigerant liquid sprinkling nozzle 75. The evaporator E and the absorber A are formed in a shell and tube type in one can body, and a partition wall is provided between the two. The evaporator E communicates with the absorber A at the upper part of the partition wall, and is configured so that the refrigerant vapor Vs evaporated by the evaporator E can be moved to the absorber A.

  The intermediate temperature solution pump 12 is a pump that sends the dilute solution Sw from the absorber A to the intermediate temperature regenerator G2 and the low temperature regenerator G1. The intermediate temperature solution pump 12 is disposed in the dilute solution outlet pipe 42. The dilute solution outlet tube 42 is connected to the dilute solution spray nozzle 52a of the intermediate temperature regenerator G2. A dilute solution pipe 41 is branched from a dilute solution outlet pipe 42 downstream of the intermediate temperature solution pump 12, and the dilute solution pipe 41 is connected to a dilute solution spray nozzle 51a of the low temperature regenerator G1. The intermediate temperature solution pump 12 only needs to have a lift that can feed the dilute solution Sw in the absorber A to the intermediate temperature regenerator G2 at a predetermined pressure. The high temperature regenerator has a higher pressure than the intermediate temperature regenerator G2. It is not necessary to have a head that can send liquid to G3. In this way, the intermediate temperature solution pump 12 does not have to be an excessively high head and flow rate pump. The intermediate temperature solution pump 12 is provided with a signal cable between the control device 60 and the discharge amount of the dilute solution Sw can be adjusted by receiving the signal from the control device 60 and adjusting the rotation speed. It is configured to be able to. In the present embodiment, the dilute solution pipe 41 is provided with the orifice 18 and the bypass pipe 17 that bypasses the orifice 18. A flow rate adjusting valve 16 is disposed in the bypass pipe 17. The flow rate adjusting valve 16, the bypass pipe 17, and the orifice 18 are constituent elements of the diluted solution introduction amount adjusting means. By opening the flow rate adjusting valve 16, the supply amount of the dilute solution Sw to the low temperature regenerator G1 is increased, a predetermined liquid level can be secured in the low temperature regenerator solution reservoir 21, and the high temperature solution pump 13 is damaged due to cavitation. Etc. can be avoided. The flow regulating valve 16 is connected to the control device 60 by a signal cable.

  The high temperature solution pump 13 is a pump that sends the low temperature concentrated solution Sh1 from the low temperature regenerator G1 to the high temperature regenerator G3. The high temperature solution pump 13 is disposed in the low temperature concentrated solution tube 43. The low temperature concentrated solution tube 43 is connected to the lower header 82 (see FIG. 2) of the high temperature regenerator G3. The high temperature solution pump 13 has a head that can send the low temperature concentrated solution Sh1 in the low temperature regenerator G1 to the high temperature regenerator G3 at a predetermined pressure. The high-temperature solution pump 13 has a signal cable laid between the control device 60 and receives the signal from the control device 60 to adjust the rotation speed, thereby adjusting the discharge amount of the low-temperature concentrated solution Sh1. It is configured to be able to.

  The low-temperature solution heat exchanger 31 includes a concentrated solution S in which a low-temperature concentrated solution Sh1, an intermediate-temperature concentrated solution Sh2, and a high-temperature concentrated solution Sh3 are mixed, the low-temperature regenerator G1, and the intermediate-temperature regenerator. This is a device that exchanges heat with the dilute solution Sw sent to G2. The low temperature solution heat exchanger 31 is typically a plate type heat exchanger, but a shell and tube type or other heat exchangers may be used. The low temperature solution heat exchanger 31 includes a dilute solution outlet tube 42 before the dilute solution tube 41 branches, a low temperature concentrated solution outlet tube 44 after the intermediate temperature concentrated solution outlet tube 45 and the hot concentrated solution outlet tube 46 are connected. It is arranged.

  The intermediate temperature solution heat exchanger 32 is a device that exchanges heat between the intermediate temperature concentrated solution Sh2 and the dilute solution Sw sent to the intermediate temperature regenerator G2. The intermediate temperature solution heat exchanger 32 is disposed below the intermediate temperature regenerator solution reservoir 22. The medium temperature solution heat exchanger 32 is typically a plate heat exchanger, but may be a shell and tube type or other heat exchanger. The intermediate temperature solution heat exchanger 32 is disposed in the diluted solution outlet tube 42 after the diluted solution tube 41 branches and the intermediate temperature concentrated solution outlet tube 45.

  The high temperature solution heat exchanger 33 is a device that exchanges heat between the high temperature concentrated solution Sh3 and the low temperature concentrated solution Sh1 sent to the high temperature regenerator G3. The high temperature solution heat exchanger 33 is disposed below the high temperature regenerator solution reservoir 85 (see FIG. 2). The high temperature solution heat exchanger 33 is typically a plate heat exchanger, but may be a shell and tube type or other heat exchanger. The high temperature solution heat exchanger 33 is disposed in the low temperature concentrated solution tube 43 and the high temperature concentrated solution outlet tube 46. Note that the high-temperature solution heat exchanger 33 may be divided into a plurality of pieces and installed in parallel or in series. If the size per unit is reduced by dividing, even if the high-temperature solution heat exchanger 33 is at a pressure exceeding atmospheric pressure, the internal volume is reduced to increase safety and Can be handled more easily including

  The control device 60 receives pressure signals from the pressure sensors 62 and 63 (see FIG. 2), and also receives liquid level signals from the liquid level sensors 66C (see FIG. 2), 65 and 64, and reproduces at a high temperature. The liquid level of the regenerator solution reservoir 85 (see FIG. 2) is the first predetermined liquid level, and the liquid level of the intermediate temperature regenerator solution reservoir 22 is the second predetermined liquid level. The high temperature solution pump 13, the intermediate temperature solution pump 12, and the flow rate adjustment valve 16 are transmitted so that the liquid level of the low temperature regenerator solution reservoir 21 becomes the third predetermined height. It is a device that adjusts the rotational speed of the pump 13 and the medium temperature solution pump 12 and the opening degree of the flow rate adjustment valve 16. The upper limit of the first predetermined liquid level is set so that the high temperature concentrated solution Sh3 in the high temperature regenerator G3 is not mixed into the high temperature refrigerant vapor pipe 54 so that the concentrated solution Sh3 in the high temperature solution heat exchanger 33 is not short. Is the liquid level between the high liquid level sensor 66CH and the low liquid level sensor 66CL in the high temperature regenerator solution reservoir 85 (see FIG. 2). Further, the upper limit of the second predetermined liquid level is set so that the intermediate temperature concentrated solution Sh2 in the intermediate temperature regenerator G2 does not flow into the intermediate temperature refrigerant vapor pipe 55, and the concentrated solution Sh2 in the intermediate temperature solution heat exchanger 32 is insufficient. In the medium temperature regenerator solution reservoir 22 (or in the case where the medium temperature liquid level detector 65 is provided in the medium temperature regenerator G2 main body) The liquid level between the high liquid level sensor 65H and the low liquid level sensor 65L. The third predetermined liquid level is a liquid level set so that cavitation does not occur in the high-temperature solution pump 12.

  Here, referring again to FIG. 2, an additional configuration of the high-temperature regenerator G3 will be described. The additional configuration is preferably provided to prevent the high temperature regenerator G3 from being damaged due to overheating due to a failure of the control device, a damage of the solution piping system, a failure of the solution pump 13 (see FIG. 1), or the like. Various safety protection functions.

  For example, the heat transfer pipe 83 and the headers 81 and 82, which may occur when the liquid level in the high-temperature regenerator G3 falls below a preset safety lower limit level during operation of the absorption refrigerator, is prevented from being damaged due to thermal deformation or overheating. Therefore, a low liquid level detector that detects that the liquid level of the solution has fallen below the safety lower limit liquid level is provided in the liquid level detector 99A (low liquid level detector 91A) or in the heat transfer tube 83 (low liquid level). It may be provided in the detector 91B). Alternatively, the low liquid level detectors 91A, 91B are not provided separately, and the low liquid level sensors 66AL, 66BL, 66CL, 66DL of the high temperature liquid level detectors 66A, 66B, 66C, 66D are not in contact with the liquid for a predetermined time. It may be detected that the liquid level has fallen below the safety lower limit liquid level.

  Further, in order to reduce the can internal pressure when the internal pressure of the high-temperature regenerator G3 exceeds the safe upper limit pressure, for example, a safety valve discharge pipe 88 is connected to the gas-liquid separator 85 and a safety valve 89 is provided here. It is good to arrange. If air or the like from the outside leaks into the high temperature regenerator G3 during the operation of the safety valve 89, the vacuum state of the absorption chiller is destroyed. Therefore, the refrigerant vapor Vs3 released by the operation of the safety valve 89 is the medium temperature regenerator G2 ( It may be configured to be guided to a low temperature regenerator G1 (see FIG. 1), a condenser C (see FIG. 1), or a pipe connected thereto. In addition, in order to detect the operation of the safety valve 89 that is not electrically connected to the control device 60 (see FIG. 1), a safety valve pressure detector 92 that detects the pressure in the safety valve discharge pipe 88 and a temperature A safety valve temperature detector 93 for detecting the vibration or a safety valve vibration detector 94 for detecting the vibration of the safety valve discharge pipe 88 may be provided. The safety valve pressure detector 92, the safety valve temperature detector 93, and the safety valve vibration detector 94 may be installed either alone or in combination, and are connected to the control device 60 (see FIG. 1) via a signal cable.

  Further, in order to prevent thermal deformation or damage due to overheating that may occur when the temperature of the high temperature regenerator G3 is overheated, a surface temperature detector for detecting the temperature of the can body surface is provided in the upper header. It may be provided on the 81 surface (surface temperature detector 95A), the heat transfer tube 83 surface (surface temperature detector 95B), or the lower header 82 surface (surface temperature detector 95C). Alternatively, in order to detect an overheated state, an in-can temperature detector 96A that detects the temperature of the hot concentrated solution Sh3 in the upper header 81, or an in-can temperature that detects the temperature of the dilute solution Sw in the lower header 82. A detector 96B may be provided. The surface temperature detectors 95A to 95C and the in-can temperature detectors 96A and 96B are connected to the control device 60 via a signal cable.

  Further, an exhaust gas temperature detector 98 is preferably provided in the exhaust gas pipe 97 in order to stop combustion when the temperature of the exhaust gas e rises above the upper limit of safety due to the occurrence of soot due to a failure of the combustion device or the like. The exhaust gas temperature detector 98 is connected to the control device 60 (see FIG. 1) via a signal cable.

  The cycle of the absorption refrigerator 1 will be described with reference to FIGS. 1 and 2 (explanation of the high temperature regenerator G3). First, the refrigerant side cycle will be described. In the condenser C, the low-temperature refrigerant vapor Vs1 evaporated in the low-temperature regenerator G1 is received, cooled by the cooling water q flowing through the cooling water pipe C1 supplied from the cooling tower (not shown), and condensed, and the refrigerant liquid Vf1 and To do. The condensed refrigerant liquid Vf1 is mixed with the medium temperature condensed refrigerant Vf2 cooled by the cooling water q flowing through the cooling water pipe C1 to be sent to the evaporator E as the refrigerant liquid Vf, and stored in the storage unit 76 as the refrigerant liquid Vf. Is done. Alternatively, the refrigerant liquid Vf sent from the condenser C to the evaporator E merges with the refrigerant liquid Vf pumped by the circulation pump 14, and is sprayed on the cold water pipe 74 by the refrigerant liquid spray nozzle 75 and then stored in the storage unit 76. May be. The refrigerant liquid Vf stored in the storage unit 76 is sent to the refrigerant liquid spray nozzle 75 by the circulation pump 14. When the refrigerant liquid Vf of the evaporator E is sprayed from the refrigerant liquid spray nozzle 75 to the cold water pipe 74, the refrigerant liquid Vf is evaporated by receiving heat from the medium to be cooled p in the cold water pipe 74, while the medium to be cooled p is Chilled. The cooled medium p to be cooled is sent to a place (not shown) where cold heat is used. On the other hand, the refrigerant liquid Vf evaporated by the evaporator E becomes the refrigerant vapor Vs and moves to the absorber A in communication.

  Next, the solution side cycle will be described. In the absorber A, a high-concentration solution S is sprayed from the concentrated solution spray nozzle 72, and the solution S absorbs the refrigerant vapor Vs generated in the evaporator E to become a dilute solution Sw. The dilute solution Sw is stored in the storage unit 73. Absorption heat generated when the solution S absorbs the refrigerant vapor Vs is removed by the cooling water q flowing through the cooling water pipe 71. In the present embodiment, the cooling water q used in the condenser C is introduced into the cooling water pipe 71, and the cooling water whose temperature has risen due to absorption heat is sent to a cooling tower (not shown) and air-cooled. The In particular, in the triple effect absorption refrigerator, the pressure of the high-temperature regenerator increases, so that the cooling water q is used in the condenser C and then guided to the absorber A as in the present embodiment, so that the inside of the low-temperature regenerator G1. The increase in pressure in the high-temperature regenerator G3 can be suppressed. However, it may be led to the condenser C after being used in the absorber A. In this case, the performance of the absorber A can be improved. Further, the cooling water q may be separately led to the condenser C and the absorber A. In this case, it is possible to improve the performance of the absorber A while suppressing an increase in pressure in the high temperature regenerator G3.

  The dilute solution Sw in the reservoir 73 is pumped to the intermediate temperature regenerator G2 and the low temperature regenerator G1 by the intermediate temperature solution pump 12, respectively. The solution stored in the storage unit 73 may be circulated by a solution circulation pump (not shown) and sprayed to the cooling water pipe 71. In this way, the cooling water pipe 71 can be sufficiently wetted with the solution, and the bias of the solution in contact with the cooling water pipe 71 can be prevented. Moreover, you may comprise so that the intermediate temperature solution pump 12 may serve as a solution circulation pump. In this case, a pipe may be branched from the dilute solution outlet pipe 42 between the intermediate temperature solution pump 12 and the low temperature solution heat exchanger 31 and connected to the concentrated solution spray nozzle 72.

  The dilute solution Sw flowing through the dilute solution outlet tube 42 is first separated by heat exchange with the concentrated solution in which each of the concentrated solutions Sh1 to Sh3 is mixed in the low-temperature solution heat exchanger 31 and then divided. To the regenerator 32 and the remainder to the low temperature regenerator G1. The dilute solution Sw introduced into the intermediate temperature solution heat exchanger 32 is heat-recovered by exchanging heat with the intermediate temperature concentrated solution Sh2, and is introduced into the intermediate temperature regenerator G2 after the temperature rises, and is sprayed from the dilute solution spray nozzle 52a. . The dilute solution Sw sprayed from the dilute solution spray nozzle 52a is heated by the high-temperature refrigerant vapor Vs3 flowing through the heating steam pipe 52, and the refrigerant in the dilute solution Sw in the intermediate-temperature regenerator G2 evaporates to form the intermediate-temperature concentrated solution Sh2. Become. Here, the high-temperature refrigerant vapor Vs3 is the refrigerant vapor evaporated in the high-temperature regenerator G3. The flow rate of the high-temperature refrigerant vapor Vs3 supplied to the heating steam pipe 52 can vary depending on the operating conditions of the high-temperature regenerator G3. The intermediate temperature refrigerant vapor Vs2 evaporated in the intermediate temperature regenerator G2 is sent to the heating steam pipe 51 of the low temperature regenerator G1. The temperature of the medium temperature concentrated solution Sh2 rises due to heat received from the high-temperature refrigerant vapor Vs3. After flowing into the medium temperature regenerator solution reservoir 22, it is introduced into the medium temperature solution heat exchanger 32 by gravity and the pressure in the medium temperature regenerator G2. Then, heat is recovered by exchanging heat with the dilute solution Sw, and the heat is collected and merged with the mixed solution of the low temperature concentrated solution Sh1 and the high temperature concentrated solution Sh3. Here, the hot concentrated solution Sh3 is a concentrated solution derived from the high temperature regenerator G3. Further, the high-temperature refrigerant vapor Vs3 obtained by heating the dilute solution Sw in the intermediate-temperature regenerator G2 is condensed at a reduced temperature, and becomes the high-temperature condensed refrigerant Vf3 and merges with the intermediate-temperature evaporative refrigerant Vs2. The high-temperature condensing refrigerant Vf3 merged with the medium-temperature evaporating refrigerant Vs2 is mixed and becomes a mixed refrigerant vapor Vm.

  The dilute solution Sw introduced to the low temperature regenerator G1 after the temperature is raised by the low temperature solution heat exchanger 31 is sprayed from the dilute solution spray nozzle 51a. The dilute solution Sw sprayed from the dilute solution spray nozzle 51a is heated by the refrigerant vapor Vm, and the refrigerant in the dilute solution Sw in the low temperature regenerator G1 evaporates to become the low temperature concentrated solution Sh1. The evaporated low-temperature refrigerant vapor Vs1 is sent to the condenser C. The temperature of the low-temperature concentrated solution Sh1 has risen due to heat received from the refrigerant vapor Vm, and once flows into the low-temperature regenerator solution reservoir 21, the liquid level in the low-temperature regenerator solution reservoir 21 rises and exceeds the overflow weir 21a. A portion of the low-temperature concentrated solution Sh1 flows through the low-temperature concentrated solution outlet pipe 44 due to gravity and the pressure in the low-temperature regenerator G1, and exits the high-temperature concentrated solution Sh3 and the intermediate-temperature solution heat exchanger 32 that have exited the high-temperature solution heat exchanger 33. After joining with the medium temperature concentrated solution Sh2, it is introduced into the low temperature solution heat exchanger 31 to exchange heat with the dilute solution Sw, and heat is recovered, and then sprayed into the absorber A from the concentrated solution spray nozzle 72 of the absorber A. The

  The low temperature concentrated solution Sh1 in the low temperature regenerator solution reservoir 21 is introduced into the low temperature concentrated solution tube 43. The low-temperature concentrated solution Sh1 flowing through the low-temperature concentrated solution tube 43 is pumped by the high-temperature solution pump 13, and heat is recovered by exchanging heat with the high-temperature concentrated solution Sh3 by the high-temperature solution heat exchanger 33. After the temperature rises, the high-temperature regenerator G3 To be introduced. The low temperature concentrated solution Sh1 introduced into the high temperature regenerator G3 is introduced into the lower header 82, and reaches the upper header 81 through the plurality of heat transfer tubes 83 with the pressure of the high temperature solution pump 13. At this time, air and gas or oil are supplied to the burner 84 and burnt, and the low-temperature concentrated solution Sh1 passing through the heat transfer tube 83 is heated using the heat of combustion as a heat source to evaporate the refrigerant from the low-temperature concentrated solution Sh1. . Refrigerant vapor is generated from the low temperature concentrated solution Sh1 heated by the heat transfer tube 83. Typically, the liquid level is maintained in the heat transfer tube 83, and the high temperature concentrated solution Sh3 and the refrigerant vapor Vs3 are in a gas-liquid two-phase flow. It flows into the gas-liquid separator 85 through the pipe 86 in the state of (multiphase flow). In the gas-liquid separator 85, the refrigerant vapor Vs3 is derived from the upper part and sent to the heating vapor pipe 52 of the intermediate temperature regenerator G2. From the lower part of the gas-liquid separator 85, a part of the hot concentrated solution Sh3 is returned to the lower header 82, and the rest is led out from the hot concentrated solution outlet pipe 46 toward the absorber A. The temperature of the high temperature concentrated solution Sh3 led out to the high temperature concentrated solution outlet pipe 46 has risen due to heat received from the combustion heat in the burner 84, and is introduced into the high temperature solution heat exchanger 33 to exchange heat with the low temperature concentrated solution Sh1. Then, the heat is recovered and merged with the low temperature concentrated solution Sh1 derived from the low temperature regenerator solution reservoir 21 through the overflow weir 21a. In the high temperature regenerator G3, refrigerant vapor Vs3 is generated in the heat transfer pipe 83, and the flow rate of the hot concentrated solution Sh3 flowing to the gas-liquid separator 85 through the upper header 81 is supplied from the low temperature regenerator G1 by the high temperature solution pump 13. Since the flow rate of the low-temperature concentrated solution Sh <b> 1 is larger, a part of the high-temperature concentrated solution Sh <b> 3 in the gas-liquid separator 85 is returned to the lower header 82. Thus, in the triple effect absorption refrigerator, since the high temperature regenerator G3 is at atmospheric pressure or higher, it is preferable that the high temperature regenerator is a once-through boiler. The operating pressure and operating temperature of the high-temperature regenerator G3 can vary depending on the refrigeration load of the absorption refrigerator 1. Typically, the fluctuation of the refrigeration load is dealt with by adjusting the amount of gas or oil supplied to the burner 84 with a control valve (not shown). When the amount of gas or oil supplied varies, the internal pressure of the high temperature regenerator G3 varies, so the temperature and pressure of the operating high temperature regenerator G3 also vary.

  In addition, when the high temperature regenerator G3 is provided with various safety protection functions, it operates as follows. In the case where the low liquid level detectors 91A and 91B and the high temperature liquid level detectors 66A, 66B, 66C and 66D are provided, the liquid level at the detectors 91A and 91B decreases and the liquid level is not detected, or the detector 66A, When the lower liquid level sensors 66AL, 66BL, 66CL, 66DL of 66B, 66C, 66D do not contact with liquid for a predetermined time, a signal is transmitted to the control device 60, and the control device 60 that has received the signal sends an alarm device (not shown). A signal is transmitted to issue an alarm and fuel supply to the burner 84 is stopped by closing a fuel valve (not shown) or the like, and combustion in the burner 84 is stopped urgently.

  In the case where the safety valve 89 is provided, the safety valve 89 is activated when the internal pressure of the high-temperature regenerator G3 rises above the safety upper limit pressure. Since the safety valve 89 is mechanically operated, the safety valve pressure detector 92, the safety valve temperature detector 93, and the safety valve vibration detector 94 detect whether the safety valve 89 has been operated. Each detector 92, 93, 94 transmits a signal to the control device 60 as needed. When the safety valve pressure detector 92 is provided, when the detected pressure reaches the preset safety upper limit value, and when the safety valve temperature detector 93 is provided, the detected temperature reaches the preset safety upper limit value. In addition, it is determined that the safety valve 89 has been activated, and the control device 60 transmits a signal to an alarm device (not shown) to issue an alarm and close the fuel valve (not shown) to supply fuel to the burner 84. To stop the combustion in the burner 84 urgently. Further, when the safety valve vibration detector 94 is provided, when the detected vibration value reaches a preset value, the safety valve 89 is actuated to blow out the refrigerant vapor Vs3, and the safety valve discharge pipe 88 is vibrated with high intensity. Therefore, the control device 60 transmits a signal to an alarm device (not shown) to give an alarm and stop the supply of fuel to the burner 84 by closing a fuel valve (not shown). Emergency stop the combustion.

  Further, when the surface temperature detectors 95A and 95B and the in-can temperature detectors 96A and 96B are provided, the detectors 95A, 95B, 96A, and 96B transmit signals to the control device 60 as needed, and the control devices that have received the signals. When it is determined that the temperature is equal to or higher than a preset safety upper limit temperature, 60 sends a signal to an alarm device (not shown) to issue an alarm and close the fuel valve (not shown) to supply fuel to the burner 84. To stop the combustion in the burner 84 urgently.

  Further, when the exhaust gas temperature detector 98 is provided, the exhaust gas temperature detector 98 transmits a signal to the control device 60 as needed, and the control device 60 that receives the signal abnormally burns when the temperature reaches a preset safety upper limit temperature or higher. Is sent to a warning device (not shown) to issue a warning, and the fuel supply to the burner 84 is stopped by closing the fuel valve (not shown), etc., and the combustion in the burner 84 is stopped immediately. Let

  In the solution cycle described above, each of the regenerators G1 to G3 supplies the refrigerant vapor not mixed with the solution to the next process, and the heat exchange efficiency due to the lack of the concentrated solution in the solution heat exchangers 31 to 33. In order to prevent lowering and overheating of the heat transfer surfaces of the regenerators G1 to G3, it is desirable to make the liquid level of the concentrated solution in each of the regenerators G1 to G3 constant. “Constant” here may have a predetermined width in view of the above-mentioned purpose. As described above, each of the regenerators G1 to G3 has an internal pressure that fluctuates with a change in the supply amount of gas or oil corresponding to a change in the refrigeration load. When the internal pressures of the regenerators G1 to G3 change, the heads of the solution pumps 12 and 13 change, and the rotational speeds of the solution pumps 12 and 13 before the internal pressures of the regenerators G1 to G3 change are maintained. A situation may occur in which the liquid level of the concentrated solution in each of the regenerators G1 to G3 cannot be maintained constant. Therefore, the absorption refrigerator 1 performs the following control by the control device 60 in order to make the liquid level of the concentrated solution in each of the regenerators G1 to G3 constant.

  In order to make the liquid level height of the hot concentrated solution Sh3 in the high temperature regenerator G3 constant, the high temperature solution pump 13 adjusts the discharge amount according to the pressure detected by the pressure sensor 63. The discharge amount is typically adjusted by adjusting the rotational speed of the high-temperature solution pump 13. It is preferable to adjust the discharge amount by adjusting the rotation speed because power consumption can be reduced as compared with the case where the amount is reduced by a valve or the like. Adjusting the discharge amount according to the pressure detected by the pressure sensor 63 typically detects the pressure in the high-temperature regenerator G3 and maintains the first predetermined liquid level obtained in advance. The high temperature solution pump 13 is operated at a pump rotation speed corresponding to the detected pressure in the high temperature regenerator G3 based on the relationship between the pump rotation speed necessary for the operation and the pressure in the high temperature regenerator G3. The liquid level in the gas-liquid separator 85 or the heat transfer tube 83, which is the liquid level in the high temperature regenerator G3, has a correlation with the pressure in the high temperature regenerator G3. That is, when the pressure in the high temperature regenerator G3 increases due to an increase in the amount of gas or oil supplied, the amount of the high temperature concentrated solution Sh3 derived increases and the liquid level decreases. If the high-temperature solution pump 13 is a centrifugal pump, when the pressure in the high-temperature regenerator G3 increases, the discharge amount of the low-temperature concentrated solution Sh1 decreases and the liquid level decreases. In any case, the liquid level can be controlled to a predetermined value by adjusting the discharge amount of the high-temperature solution pump 13 (increasing the discharge amount or increasing the decreased discharge amount and returning it to the original value). The rotational speed of the high temperature solution pump 13 may be adjusted based on the pressure difference between the pressure of the high temperature regenerator G3 and the pressure of the low temperature regenerator G1. Such adjustment based on the differential pressure is also included in the adjustment based on the pressure detected by the pressure sensor 63.

  If the pressure balance in the absorption refrigerator 1 fluctuates, the rotation speed of the high-temperature solution pump 13 and the internal pressure of the high-temperature regenerator G3 required to maintain the first predetermined liquid level obtained in advance are assumed. Based on the relationship, when the first predetermined liquid level cannot be maintained even when the high temperature solution pump 13 is operated at the pump rotation speed corresponding to the detected pressure in the high temperature regenerator G3, the high temperature solution pump 13 is used. The liquid level for correcting the discharge amount is detected by liquid level sensors 66CH and 66CL (in some cases, the liquid level sensors 66AH, 66AL, 66BH, 66BL, 66DH, and 66DL; the same applies in this paragraph). . When the liquid level falls and the low liquid level sensor 66CL has not detected the liquid level, the control device 60 sends a signal to the high temperature solution pump 13 to increase the rotation speed by a predetermined value. Conversely, when the liquid level rises and the high liquid level sensor 66CH detects the high liquid level, the control device 60 sends a signal to the high temperature solution pump 13 to decrease the rotation speed by a predetermined value. When the high liquid level is not detected and the low liquid level is detected, the control device 60 performs the pump rotation speed and high temperature regeneration necessary for maintaining the first predetermined liquid level obtained in advance. The relationship with the pressure in the vessel G3 is corrected. This correction corrects the rotational speed corresponding to a predetermined value increased or decreased by the operation of the high or low liquid level sensors 66CH and 66CL. By correcting, the number of times of operation of the liquid level sensors 66CH and 66CL is reduced. In this way, the liquid level of the high temperature concentrated solution Sh3 in the high temperature regenerator G3 is maintained at the first predetermined liquid level, so that the solution is mixed into the high temperature refrigerant vapor Vs3, or the high temperature solution heat exchanger 33. This prevents the so-called refrigerant vapor from being blown through.

  Even when the liquid level height of the medium temperature concentrated solution Sh2 in the medium temperature regenerator G2 is made constant, the same control as the control for making the liquid level height of the high temperature concentrated solution Sh3 in the high temperature regenerator G3 constant is performed. . However, when the liquid level height of the medium temperature concentrated solution Sh2 in the medium temperature regenerator G2 is made constant, the discharge amount of the medium temperature solution pump 12 is adjusted according to the pressure detected by the pressure sensor 62, and the second predetermined amount is set. When the liquid level cannot be maintained, the liquid level is detected by the liquid level sensors 65H and 65L to correct the discharge amount of the intermediate temperature solution pump 12. In addition, although the intermediate temperature solution pump 12 sends the dilute solution Sw in parallel to the intermediate temperature regenerator G2 and the low temperature regenerator G1, a small pressure loss (for example, an orifice 18 or a control valve) is provided in the dilute solution pipe 41. Thus, the liquid level of the low temperature concentrated solution Sh1 in the low temperature regenerator G1 can be maintained within a predetermined range by controlling the liquid level of the medium temperature concentrated solution Sh2 in the medium temperature regenerator G2 to be constant. The rotational speed of the intermediate temperature solution pump 12 may be adjusted based on the differential pressure between the pressure of the intermediate temperature regenerator G2 and the pressure of the absorber A. Such adjustment based on the differential pressure is also included in the adjustment based on the pressure detected by the pressure sensor 62.

  Note that the liquid level control is performed without detecting the pressure in each of the regenerators G2 and G3, and the high and low liquid levels in the regenerator solution reservoirs 22 and 85 are adjusted to the liquid level sensors 65H, 65L, 66CH, and 66CL. For example, the detection may be performed by adjusting the rotational speeds of the solution pumps 12 and 13 so that the liquid level becomes a predetermined liquid level. Further, instead of detecting the upper and lower limits of the liquid level, for example, a liquid level detector (not shown) such as a displacement type liquid level detector may be provided and continuously controlled by the adjuster. In this case, P control or PI control is preferable because the control is stable. Further, the liquid level may be controlled only by the pressure detectors 62 and 63 without using the liquid level sensors 65H, 65L, 66CH, 66CL, etc., but the predetermined liquid level obtained in advance is maintained. It is preferable to use liquid level sensors 65H, 65L, 66CH, 66CL, etc., because it may not be possible to detect a deviation caused by the relationship between the rotational speed of the solution pump required for the heating and the internal pressure of the high-temperature regenerator G3.

(Change of regenerator pressure detection means)
In performing the liquid level control, a temperature sensor may be used instead of the pressure sensors 62 and 63.
FIG. 3 is a system diagram showing a triple effect absorption refrigerator 2 (hereinafter simply referred to as “absorption refrigerator 2”) according to a modification of the absorption refrigerator 1. In the absorption refrigerator 2, instead of the pressure sensor 63 (see FIG. 1), a temperature sensor 69 as a high-temperature refrigerant temperature detector is provided in the high-temperature condensing refrigerant pipe 56 near the outlet of the heating steam pipe 52 of the intermediate temperature regenerator G2. The temperature of the high-temperature condensed refrigerant Vf3 in which the high-temperature refrigerant vapor Vs3 is condensed is detected. Further, instead of the pressure sensor 62 (see FIG. 1), a temperature sensor 68 as an intermediate temperature refrigerant temperature detector is provided in the intermediate temperature condensed refrigerant pipe 57 to detect the temperature of the intermediate temperature condensed refrigerant Vf2 condensed by the intermediate temperature refrigerant vapor Vs2. . Since the temperatures of the respective condensed refrigerants Vf3 and Vf2 are substantially saturated temperatures, the rotation speed of each solution pump and each regeneration required to maintain the predetermined liquid level obtained in advance by converting the saturation temperature into pressure. The predetermined liquid level can be maintained by adjusting the rotation speed of the solution pumps 12 and 13 based on the relationship with the pressure in the vessels G2 and G3. In addition, although it is preferable that the temperature to detect is a saturation temperature, it does not necessarily need to be a saturation temperature. Even if it is the temperature of the supercooled refrigerant | coolant, if it is the temperature near the exit of the heating steam pipes 51 and 52, there is no problem in practical use.

  In addition, the absorption refrigerator 2 includes a low temperature solution pump 15 for flowing the dilute solution Sw from the absorber A to the low temperature regenerator G1 separately from the intermediate temperature solution pump 12, and the dilute solution pipe 41 includes a flow rate adjusting valve 16, The bypass pipe 17 and the orifice 18 (see FIG. 1) are not provided. If the low temperature solution pump 15 is separately provided, the amount of the dilute solution Sw introduced into the low temperature regenerator G1 can be adjusted without excessive pressure loss. The cryogenic solution pump 15 is connected to the control device 60 by a signal cable. Other configurations of the absorption refrigerator 2 are the same as those of the absorption refrigerator 1 (see FIG. 1). It should be noted that the absorption refrigerator 1 may be provided with a low temperature solution pump 15 and the flow rate adjustment valve 16, the bypass pipe 17 and the orifice 18 may be omitted, and conversely, the absorption refrigerator 2 may have a flow rate adjustment valve instead of the low temperature solution pump 15. 16, a bypass pipe 17 and an orifice 18 may be provided. Further, the low temperature solution pump 15 sets the rotation speed based on the pressure of the low temperature regenerator G1 in the same manner as the other solution pumps 12 and 13, and depends on the high and low liquid levels in the downstream portion of the overflow weir 21a. The rotational speed may be corrected.

(Multi-stage absorber and evaporator)
In the above description, the absorber and the evaporator are single-stage triple effect absorption refrigerators, but the absorber and the evaporator may be a multi-stage triple effect absorption refrigerator.
FIG. 4 is a partial system diagram showing a triple effect absorption refrigerator 3 (hereinafter simply referred to as “absorption refrigerator 3”) in which an absorber and an evaporator are provided in multiple stages. In the absorption refrigerator 3, the absorber A (see FIGS. 1 and 3) is divided into two stages, a low stage absorber A1 and a high stage absorber A2, and the evaporator E (see FIGS. 1 and 3) is divided into a low stage evaporator. E1 and the high-stage evaporator E2 are divided into two stages, and the low-stage absorber A1 and the low-stage evaporator E1, and the high-stage absorber A2 and the high-stage evaporator E2 are provided as a pair in independent shells. ing. Then, the concentrated solution is led to the high stage absorber A2 after being led to the low stage absorber A1, and the cooled medium p is first led to the high stage evaporator E2 and then to the low stage evaporator E1. The cooling water q exiting the condenser C is guided in parallel to the low stage absorber A1 and the high stage absorber A2. Other configurations are the same as those of the absorption refrigerators 1 and 2. Thus, when the absorber A and the evaporator E are multistage triple effect absorption refrigerators, the concentration of the dilute solution Sw can be lowered, and the boiling temperature in the low temperature regenerator G1 and the medium temperature regenerator G2 is lowered. The temperature and pressure of the high temperature regenerator G3 can be reduced.

(Modification of high temperature regenerator)
Further, the high temperature regenerator G3 may have the same configuration as the intermediate temperature regenerator G2 instead of the configuration shown in FIG.
FIG. 5 is a diagram of a high-temperature regenerator G3 ′ according to a modification. The high temperature regenerator G3 ′ is provided with a low temperature concentrated solution introduction pipe 53a for introducing the low temperature concentrated solution Sh1. The high-temperature regenerator G3 ′ heats the low-temperature concentrated solution Sh1 using combustion gas introduced from gas, oil, or the like and burned, steam supplied from a steam generation boiler (not shown), or an external heating source. It is configured to be able to. In the example shown in FIG. 5, the high temperature regenerator G3 ′ is provided with a heating steam pipe 53 for flowing a heating steam r as a heating source for heating the low temperature concentrated solution Sh1. The heating steam pipe 53 is immersed in the low temperature concentrated solution Sh1 introduced from the low temperature concentrated solution introduction pipe 53a, and the high temperature regenerator G3 ′ is configured as a so-called full liquid type. Connected to the upper part of the high-temperature regenerator G3 ′ is a high-temperature refrigerant vapor pipe 54 that leads out the high-temperature refrigerant vapor Vs3 evaporated from the low-temperature concentrated solution Sh1 by the heat of the heating vapor r. The high temperature regenerator G3 ′ is provided with a pressure sensor 63 as a pressure detector for detecting the pressure in the high temperature regenerator G3 ′. Since the pressure sensor 63 only needs to be able to detect the pressure in the high temperature regenerator G3, the pressure sensor 63 may be provided in the high temperature refrigerant vapor pipe 54 in the vicinity of the high temperature regenerator G3 ′. The pressure sensor 63 is connected to the control device 60 via a signal cable, and is configured to transmit a pressure signal detected by the pressure sensor 63 to the control device 60.

  Further, the high temperature regenerator G3 ′ is heated by the heating steam r flowing in the heating steam pipe 53 immersed in the low temperature concentrated solution Sh1, and the refrigerant evaporates from the low temperature concentrated solution Sh1 to increase the concentration. A high temperature regenerator solution reservoir 23 for storing the high temperature concentrated solution Sh3 is provided. In the high temperature regenerator solution reservoir 23, typically, the lower part of the high temperature regenerator G3 ′ is provided with a heating steam pipe 53 by a partition plate 23a extending vertically upward from the bottom of the high temperature regenerator G3 ′. It is formed by partitioning with the space. The space in which the heating steam pipe 53 is disposed is referred to as a main body of the high temperature regenerator G3 '. The bottom of the high temperature regenerator solution reservoir 23 is formed to be lower than the bottom of the high temperature regenerator G3 'in the space where the heating steam pipe 53 is disposed. The high-temperature regenerator solution reservoir 23 is configured such that the concentrated solution Sh3 in the space (main body) in which the heating steam pipe 53 is disposed exceeds the partition plate 23a. The high temperature regenerator solution reservoir 23 is typically formed integrally with the high temperature regenerator G3 ′. For example, a tank having a predetermined volume is physically separated from the high temperature regenerator G3 ′ by piping. Even if they are connected, they are part of the high temperature regenerator G3 ′. Further, the high temperature regenerator solution reservoir 23 may be a pipe instead of a tank-like shape. The high temperature regenerator solution reservoir 23 is connected to a high temperature concentrated solution outlet tube 46 for extracting the high temperature concentrated solution Sh3. The high temperature regenerator solution reservoir 23 includes a high liquid level sensor 66H that detects a high liquid level of the high temperature concentrated solution Sh3 stored therein and a low liquid level sensor 66L that detects a low liquid level. A detector 66 is provided. Typically, electrode bars are used for the high and low liquid level sensors 66H and 66L. Signal cables are laid between the high liquid level sensor 66H and the low liquid level sensor 66L and the control device 60, respectively, so that the detected liquid level signal can be transmitted to the control device 60. . The high and low liquid level sensors 66H and 66L may be float switches other than the electrode rods. When the liquid level of the high temperature regenerator G3 'main body is to be controlled, the high temperature liquid level detector 66 is disposed in the high temperature regenerator G3' main body.

  In the high temperature regenerator G3 ', the low temperature concentrated solution Sh1 is introduced from the low temperature concentrated solution introduction pipe 53a into the high temperature regenerator G3'. The low-temperature concentrated solution Sh1 pumped by the high-temperature solution pump 13 and introduced into the high-temperature regenerator G3 ′ increases in the low-temperature concentrated solution Sh1 on the heating steam pipe 53 side of the partition plate 23a, and a steam source (not shown). Is heated by the heating steam r supplied from, and the refrigerant evaporates to become a high-temperature concentrated solution Sh3. The operating pressure and operating temperature of the high-temperature regenerator G3 'at this time can vary according to the refrigeration load of the absorption refrigerator 1. Typically, the fluctuation of the refrigeration load is dealt with by adjusting the amount of the heating steam r introduced into the heating steam pipe 53 with a control valve (not shown). When the supply amount of the heating steam r to the heating steam pipe 53 varies, the internal pressure of the high temperature regenerator G3 'varies, so that the temperature and pressure of the operating high temperature regenerator G3' also vary. The evaporated refrigerant vapor Vs3 is sent to the heating vapor pipe 52 (see FIGS. 1 and 3) of the intermediate temperature regenerator G2. The temperature of the hot concentrated solution Sh3 rises due to the heat received from the heating steam r, and after flowing into the hot regenerator solution reservoir 23 through the partition plate 23a, the hot concentrated solution Sh3 is heated to a high temperature by the pressure and gravity in the hot regenerator G3 ′. It is introduced into the solution heat exchanger 33.

(Addition of heat recovery means)
In each of the above triple effect absorption refrigerators, in addition to heat recovery by heat exchange between solutions in each solution heat exchanger 31-33, drain Vf3 of intermediate temperature regenerator G2, drain Vf2 of low temperature regenerator G1, and dilute solution Sw. Recovery by heat exchange with the heat, heat recovery by heat exchange between the drain Vf3 of the intermediate temperature regenerator G2 and the low temperature concentrated solution Sh1, and heat exchange between the exhaust gas from the high temperature regenerator G3 and the dilute solution Sw or the low temperature concentrated solution Sh1. Heat recovery may be performed. Further, the heat recovery of the exhaust gas from the high temperature regenerator G3 may be performed between the supply air for combustion to the high temperature regenerator G3. Below, the part peculiar to what added the heat | fever recovery means is demonstrated.

  FIG. 6 is a partial system diagram of a solution system in which heat is recovered from the condensed refrigerant with a dilute solution sent to the intermediate temperature regenerator and the low temperature regenerator, and (a) is a low temperature solution heat exchanger 31 and medium temperature condensed refrigerant solution heat. The partial system diagram which has arrange | positioned the exchanger 37, the intermediate temperature solution heat exchanger 32, and the high temperature condensed refrigerant | coolant solution heat exchanger 36 in series, respectively, (b) is the low temperature solution heat exchanger 31 and the intermediate temperature condensed refrigerant solution heat exchanger 37, 4 is a partial system diagram in which the intermediate temperature solution heat exchanger 32 and the high temperature condensing refrigerant solution heat exchanger 36 are arranged in parallel, respectively, and (c) is an intermediate temperature condensing refrigerant solution heat exchanger 37 and a high temperature condensing refrigerant solution heat exchanger arranged in series. FIG. 6 is a partial system diagram in which a low-temperature solution heat exchanger 31 and a medium-temperature solution heat exchanger 32 are arranged in parallel to 36. 6 shows the solution feed line from the absorber A of the solution system to the regenerators G1 to G3 in the absorption refrigerators 1 and 2 (see FIGS. 1 and 3). Omitted. As shown in FIG. 6, when recovering heat from the condensed refrigerant, the high-temperature condensed refrigerant solution heat exchanger 36 that exchanges heat between the high-temperature condensed refrigerant Vf3 and the diluted solution Sw, the intermediate-temperature condensed refrigerant Vf2, and the diluted solution Sw The intermediate temperature condensed refrigerant solution heat exchanger 37 that performs heat exchange is provided. The high temperature condensed refrigerant solution heat exchanger 36 and the medium temperature condensed refrigerant solution heat exchanger 37 are typically plate-type heat exchangers, but may be shell-and-tube type or other heat exchangers.

  When the low temperature solution heat exchanger 31 and the medium temperature condensed refrigerant solution heat exchanger 37 and the medium temperature solution heat exchanger 32 and the high temperature condensed refrigerant solution heat exchanger 36 are arranged in series as shown in FIG. Heat recovery is performed by exchanging heat in the intermediate-temperature condensed refrigerant solution heat exchanger 37 and the intermediate-temperature condensed refrigerant solution heat exchanger 37 in which the diluted solution Sw that has passed through the low-temperature solution heat exchanger 31 and is divided into the diluted solution pipe 41 is condensed in the low-temperature regenerator G1. . On the other hand, the dilute solution Sw that has passed through the low temperature solution heat exchanger 31 and then passed through the intermediate temperature heat exchanger 32 is heat-exchanged by the high temperature condensed refrigerant solution heat exchanger 36 and the high temperature condensed refrigerant solution heat exchanger 36 that has condensed in the intermediate temperature regenerator G2. Collect. In this case, the temperature of the dilute solution Sw introduced into the intermediate temperature regenerator G2 and the low temperature regenerator G1 can be increased.

  When the low temperature solution heat exchanger 31 and the medium temperature condensed refrigerant solution heat exchanger 37 and the medium temperature solution heat exchanger 32 and the high temperature condensed refrigerant solution heat exchanger 36 are arranged in parallel as shown in FIG. After diluting the dilute solution Sw on the discharge side of the intermediate temperature solution pump 12, it is introduced into the low temperature solution heat exchanger 31 and the intermediate temperature condensed refrigerant solution heat exchanger 37, respectively. The dilute solution Sw introduced into the intermediate temperature condensed refrigerant solution heat exchanger 37 merges with the dilute solution Sw that has passed through the low temperature solution heat exchanger 31 and branched into the dilute solution pipe 41 after exchanging heat with the intermediate temperature condensed refrigerant Vf2. And introduced into the low temperature regenerator G1. On the other hand, the dilute solution Sw introduced into the low-temperature solution heat exchanger 31 exchanges heat with a solution (see FIGS. 1 and 3) in which the low-temperature concentrated solution Sh1, the middle-temperature concentrated solution Sh2, and the high-temperature concentrated solution Sh3 are joined. The dilute solution Sw derived from the low temperature solution heat exchanger 31 through heat exchange is partly merged with the dilute solution Sw that has passed through the intermediate temperature condensed refrigerant solution heat exchanger 37 and is introduced into the low temperature regenerator G1. Further, the flow is divided and introduced into the intermediate temperature solution heat exchanger 32 and the high temperature condensed refrigerant solution heat exchanger 36, respectively. The dilute solution Sw introduced into the intermediate temperature solution heat exchanger 32 exchanges heat with the intermediate temperature concentrated solution Sh2 (see FIGS. 1 and 3), and the dilute solution Sw introduced into the high temperature condensed refrigerant solution heat exchanger 36 is converted into the high temperature condensed refrigerant Vf3. After exchanging heat with each other, they merge and are introduced into the intermediate temperature regenerator G2. In this case, it is possible to adjust the solution diversion ratio between the medium temperature condensing refrigerant solution heat exchanger 37 and the low temperature solution heat exchanger 31, and the solution diversion ratio between the high temperature condensing refrigerant solution heat exchanger 36 and the medium temperature solution heat exchanger 32, The temperature of the dilute solution Sw introduced into the intermediate temperature regenerator G2 and the low temperature regenerator G1 can be increased while adjusting the heat exchange amount of each heat exchanger.

  As shown in FIG. 6C, the low temperature solution heat exchanger 31 and the medium temperature solution heat exchanger 32 are arranged in parallel with the medium temperature condensed refrigerant solution heat exchanger 37 and the high temperature condensed refrigerant solution heat exchanger 36 arranged in series. In such a case, after diluting the dilute solution Sw on the discharge side of the intermediate temperature solution pump 12, it is introduced into the low temperature solution heat exchanger 31 and the intermediate temperature condensed refrigerant solution heat exchanger 37, respectively. The dilute solution Sw introduced into the low temperature solution heat exchanger 31 is diverted after heat exchange with the low temperature concentrated solution Sh1 (see FIGS. 1 and 3), a part is introduced into the low temperature regenerator G1, and the rest is medium temperature solution heat exchange. It is introduced into the vessel 32 to exchange heat with the medium-temperature concentrated solution Sh2 (see FIGS. 1 and 3). On the other hand, the dilute solution Sw introduced into the intermediate temperature condensed refrigerant solution heat exchanger 37 exchanges heat with the intermediate temperature condensed refrigerant Vf2, and then is introduced into the high temperature condensed refrigerant solution heat exchanger 36 to exchange heat with the high temperature condensed refrigerant Vf3. The dilute solution Sw derived from the intermediate temperature solution heat exchanger 32 and the dilute solution Sw derived from the high-temperature condensed refrigerant solution heat exchanger 36 are merged and introduced into the intermediate temperature regenerator G2. In this case, it is possible to adjust the solution diversion ratio to the medium temperature condensed refrigerant solution heat exchanger 37, the high temperature condensed refrigerant solution heat exchanger 36, the low temperature solution heat exchanger 31, and the medium temperature solution heat exchanger 32, and each heat exchange. The temperature of the dilute solution Sw introduced into the intermediate temperature regenerator G2 can be increased while adjusting the heat exchange amount of the cooler.

  FIG. 7 is a partial system diagram of a solution system for recovering heat from a condensed refrigerant with a low-temperature concentrated solution sent to a high-temperature regenerator. 7 also shows the solution feed line from the absorber A of the solution system to each of the regenerators G1 to G3 in the absorption refrigerators 1 and 2 (see FIGS. 1 and 3). Is omitted. 7 is also provided with a high-temperature condensed refrigerant solution heat exchanger 36 and an intermediate-temperature condensed refrigerant solution heat exchanger 37 similar to those shown in FIG. As shown in FIG. 7, when the low temperature solution heat exchanger 31 and the medium temperature condensed refrigerant solution heat exchanger 37 and the high temperature condensed refrigerant solution heat exchanger 36 and the high temperature solution heat exchanger 33 are arranged in series, respectively, the low temperature solution heat The dilute solution Sw that has passed through the exchanger 31 and is divided into the dilute solution tube 41 exchanges heat with the intermediate temperature condensed refrigerant Vf2 condensed by the low temperature regenerator G1 and the intermediate temperature condensed refrigerant solution heat exchanger 37 to recover heat. On the other hand, the low-temperature concentrated solution Sh1 derived from the low-temperature regenerator G1 performs heat recovery by exchanging heat between the high-temperature condensed refrigerant Vf3 condensed in the medium-temperature regenerator G2 and the high-temperature condensed refrigerant solution heat exchanger 36. In this case, the temperature of the dilute solution Sw introduced into the low temperature regenerator G1 and the low temperature concentrated solution Sh1 introduced into the high temperature regenerator G3 can be increased.

  FIG. 8 is a partial system diagram of a solution system for recovering heat from the exhaust gas discharged from the high-temperature regenerator into a dilute solution and a low-temperature concentrated solution. (A) is a low-temperature solution heat exchanger 31 and an exhaust gas solution heat exchanger 35A, And a partial system diagram in which the intermediate temperature solution heat exchanger 32 and the exhaust gas solution heat exchanger 35B, the high temperature solution heat exchanger 33 and the exhaust gas solution heat exchanger 35C are arranged in series, respectively, (b) is the low temperature solution heat exchanger 31 and the exhaust gas. FIG. 3 is a partial system diagram in which a solution heat exchanger 35A, an intermediate temperature solution heat exchanger 32 and an exhaust gas solution heat exchanger 35B, and a high temperature solution heat exchanger 33 and an exhaust gas solution heat exchanger 35C are arranged in parallel. Also in FIG. 8, the solution feed line from the absorber A of the solution system to each of the regenerators G1 to G3 is shown, and the other components are not shown. As shown in FIG. 8, when recovering heat from the exhaust gas discharged from the high-temperature regenerator, three exhaust gas solution heat exchangers 35A, 35B, and 35C are provided. As the exhaust gas solution heat exchangers 35A, 35B, and 35C, a shell-and-tube heat exchanger is typically used, but other heat exchangers may be used.

  As shown in FIG. 8A, the low temperature solution heat exchanger 31 and the exhaust gas solution heat exchanger 35A, the intermediate temperature solution heat exchanger 32 and the exhaust gas solution heat exchanger 35B, the high temperature solution heat exchanger 33 and the exhaust gas solution heat exchanger. When 35C is arranged in series, the exhaust gas e discharged from the high temperature regenerator G3 first performs heat exchange with the low temperature concentrated solution Sh1 that has passed through the high temperature solution heat exchanger 33 in the exhaust gas solution heat exchanger 35C. The exhaust gas e derived from the exhaust gas solution heat exchanger 35C then performs heat exchange with the dilute solution Sw that has passed through the intermediate temperature solution heat exchanger 32 in the exhaust gas solution heat exchanger 35B. The exhaust gas e derived from the exhaust gas solution heat exchanger 35B then exchanges heat with the dilute solution Sw that has passed through the low temperature solution heat exchanger 31 in the exhaust gas solution heat exchanger 35A. In this case, the temperatures of the low-temperature concentrated solution Sh1 introduced into the high-temperature regenerator G3 and the dilute solution Sw introduced into the intermediate-temperature regenerator G2 and the low-temperature regenerator G1 can be increased.

  As shown in FIG. 8B, the low temperature solution heat exchanger 31 and the exhaust gas solution heat exchanger 35A, the intermediate temperature solution heat exchanger 32 and the exhaust gas solution heat exchanger 35B, the high temperature solution heat exchanger 33 and the exhaust gas solution heat exchanger. When 35C is arranged in parallel, the low temperature concentrated solution Sh1 is diverted on the discharge side of the high temperature solution pump 13, and a part of the low temperature concentrated solution Sh3 is exchanged with the high temperature concentrated solution Sh3 in the high temperature solution heat exchanger 33, and then is transferred to the high temperature regenerator G3. The remaining gas flows through the low-temperature concentrated solution pipe 43D, bypasses the high-temperature solution heat exchanger 33, is guided to the exhaust gas solution heat exchanger 35C, and exchanges heat with the exhaust gas e discharged from the high-temperature regenerator G3. Introduced into the vessel G3. Exhaust gas e derived from the exhaust gas solution heat exchanger 35C then passes through the low-temperature solution heat exchanger 31 and then diverts to flow through the dilute solution pipe 42D and the dilute solution Sw and the exhaust gas solution bypassing the intermediate temperature solution heat exchanger 32. Heat exchange is performed by the heat exchanger 35B. The remaining part of the dilute solution Sw that has been branched after passing through the low temperature solution heat exchanger 31 flows through the dilute solution tube 41 and is introduced as it is into the low temperature regenerator G1, while the other remaining dilute solution Sw is the intermediate temperature solution heat exchanger. After being led to 32 and exchanging heat with the medium temperature concentrated solution Sh2, it is introduced into the medium temperature regenerator G2. The dilute solution Sw introduced into the low temperature solution heat exchanger 31 is a part of the diverted solution on the discharge side of the intermediate temperature solution pump 12, and the remaining dilute solution Sw divided on the discharge side of the intermediate temperature solution pump 12 is diluted solution tube 41D. And is introduced into the low temperature regenerator G1 after exchanging heat with the exhaust gas e derived from the exhaust gas solution heat exchanger 35B. In this case, each heat exchanger 31, 32, 33 is adjusted by adjusting the solution diversion ratio between the solution heat exchangers 31, 32, 33 and the exhaust gas solution heat exchangers 35A, 35B, 35C installed in parallel therewith. , 33, 35 </ b> A, 35 </ b> B, and 35 </ b> C can be adjusted while increasing the temperature of the low temperature concentrated solution Sh <b> 1 and the diluted solution Sw introduced into the regenerators G <b> 1 to G <b> 3.

  6 to 8, the heat recovery by heat exchange between the drain Vf3 of the intermediate temperature regenerator G2 or the drain Vf2 of the low temperature regenerator G1 and the dilute solution Sw or the low temperature concentrated solution Sh1, and the high temperature regenerator G3 Among the heat exchangers 36, 37, 35A to 35C used for heat recovery by heat exchange between the exhaust gas and the low temperature concentrated solution Sh1 or the dilute solution Sw, the heat exchanger installed in series with the solution heat exchangers 31 to 33 is used. The parallel combinations can be appropriately selected and arranged, and all of the illustrated combinations are not necessarily provided, and may be appropriately selected and arranged depending on the operating conditions of the absorption refrigerator.

(Addition of solution pump)
In each of the above triple effect absorption refrigerators, a solution pump (not shown) may be installed in the low temperature concentrated solution pipe 44 between the low temperature regenerator G1 and the low temperature solution heat exchanger 31. In order to increase the temperature efficiency of the low-temperature solution heat exchanger 31, when the pressure loss of the low-temperature solution heat exchanger 31 becomes high, the solution is pumped by a solution pump (not shown), so that the low-temperature regenerator G1 transfers to the absorber A. The amount of solution circulation can be ensured. The solution pump (not shown) is provided with a liquid level detector (not shown) connected to the control device 60 via a signal cable on the downstream side of the overflow weir 21a of the low temperature regenerator G1 so as to maintain a predetermined liquid level. It is good to control.

(Addition of flash chamber)
Further, a flash chamber may be installed at a junction of the high-temperature concentrated solution Sh3, the medium-temperature concentrated solution Sh2, and the low-temperature concentrated solution Sh1 introduced into the absorber A. If there is a difference in the saturation pressure of each concentrated solution due to the operating conditions of the absorption refrigerator, when each concentrated solution joins, further refrigerant vapor is generated as the pressure of the concentrated solution with the higher saturation pressure decreases . When there is a large amount of refrigerant vapor generated at the junction, there is a risk of problems such as corrosion occurring in the pipe. Therefore, it is advisable to install a flash chamber to mitigate the effects of refrigerant vapor re-evaporation. Further, a pipe leading to the low temperature regenerator G1 or the condenser C may be connected to the upper part of the flash chamber, and the refrigerant vapor generated in the flash chamber may be sent to the low temperature regenerator G1 or the condenser C.

(Addition of flow rate adjustment means)
Further, a flow rate adjusting means (not shown) such as an electric valve is provided in each of the high temperature concentrated solution outlet pipe 46 on the downstream side of the high temperature solution heat exchanger 33 and the middle temperature concentrated solution outlet pipe 45 on the downstream side of the intermediate temperature solution heat exchanger 32. ) May be provided. Typically, the supply amount of the solution to the high temperature regenerator G3 by the high temperature solution pump 13 is determined by the derived amount of the high temperature concentrated solution Sh3 determined by the resistance of the high temperature concentrated solution outlet pipe 46, and the intermediate temperature regenerator by the intermediate temperature solution pump 12 is determined. The supply amount of the solution to G2 is determined by the derived amount of the medium-temperature concentrated solution Sh2 determined by the resistance of the medium-temperature concentrated solution outlet tube 45. However, since these are determined based on the rated operating conditions of the absorption refrigerator, The load conditions do not result in a solution supply that optimizes cycle efficiency. Therefore, a flow rate adjusting means such as an electric valve may be provided at the above position so that a solution amount corresponding to the refrigeration load can be supplied. The flow rate adjusting means such as an electric valve is typically connected to the control device 60 via a signal cable, and is configured to operate by receiving a signal from the control device 60. Also, the solution supply to the regenerators G1 to G3 is excessive even during operation at the minimum rotation speed of the solution pumps 12 and 13, such as immediately after the start of the absorption refrigerator, when the refrigeration load is small, or when the cooling water temperature is low. In such a case, an excess amount of solution may be returned to the absorber A by controlling a flow rate adjusting means such as a motorized valve (open in the case of a motorized valve).

  Hereinafter, the temperature, pressure, and the like of the high-temperature regenerator G3 in the absorption refrigerator 1 shown in FIG. 1 are shown as Example 1, and these are shown in the absorption refrigerator 101 shown in FIG. 11, the absorption refrigerator 102 shown in FIG. Comparison is made with the temperature and pressure of the high-temperature regenerator in the absorption refrigerator 103 shown. The absorption refrigerators 101 to 103 are all triple-effect absorption refrigerators as is apparent from the figure. The absorption refrigerator 101 is the comparative example 1, the absorption refrigerator 102 is the comparative example 2, and the absorption refrigerator 103 is the comparative example. 3. Comparative Example 1 is an absorption refrigerator having the solution cycle of Patent Document 1 shown at the beginning, Comparative Example 2 is an absorption refrigerator having a series flow solution cycle, and Comparative Example 3 is an absorption refrigerator having a branch flow solution cycle. is there.

  FIG. 9 shows the specifications of each absorption refrigerator (including the temperature and pressure of the high-temperature regenerator). Note that the numerical values shown in FIG. 9 indicate that the temperature of the cold water entering the cold water pipe (cooled medium p entering the cold water pipe 74 in FIG. 1) is 13 ° C., the temperature of the cold water discharged from the cold water pipe is 7 ° C. This is when the temperature of the cooling water entering (cooling water q entering the cooling water pipe 71 of the absorber A in FIG. 1) is 31 ° C. However, in the present embodiment, unlike the case shown in FIG. 1, the flow of the cooling water q is guided from the absorber A to the condenser C to improve the performance of the absorber A. When Example 1 is compared with Comparative Example 1, the high temperature regenerator outlet temperature is slightly higher in Example 1 than in Comparative Example 1, but is approximately equal, and the high temperature regenerator pressure is approximately equal. However, in Comparative Example 1, the high temperature solution pump that supplies the solution to the high temperature regenerator is installed at the outlet of the medium temperature regenerator, and the solution pump suction solution temperature is 125.9 ° C. On the other hand, in Example 1, the high temperature solution pump 13 is installed on the outlet side of the low temperature regenerator G1, and the temperature of the low temperature concentrated solution Sh1 sucked by the solution pump 13 is as low as 75.1 ° C. The direction is superior in the durability of the high-temperature solution pump 13. When Example 1 is compared with Comparative Example 2, the high temperature regenerator solution outlet temperature is slightly higher than that of Comparative Example 2, but the degree of pressure decrease is large. When Example 1 is compared with Comparative Example 3, both the high temperature regenerator outlet temperature and the high temperature regenerator pressure are lower than those of Comparative Example 3. Thus, in Example 1, the temperature of the solution sucked by the high temperature solution pump 13 could be suppressed while suppressing an increase in the temperature and pressure of the high temperature regenerator G3.

Next, the absorption refrigerator 3 shown in FIG. 4 was used as Example 2, and the temperature and pressure of the high-temperature regenerator G3 in Example 2 were detected. In the second embodiment, the cooling water q flows from the condenser C to the absorbers A1 and A2, and the evaporator and the absorber are in two stages.
FIG. 10 shows the specifications (including the temperature and pressure of the high-temperature regenerator G3) in Example 2. In Example 2, the pressure in the high temperature regenerator G3 was 0.090 MPaG (0.92 kg / cm ² G), and the temperature of the high temperature concentrated solution Sh3 (high temperature regenerator solution outlet temperature) was 169.8 ° C. As described above, in Example 2, the pressure in the high-temperature regenerator G3 is 0.098 MPaG (1.0 kg / cm ² G) or less, which can maintain the strength and simplify the legal regulations related to the pressure vessel. The temperature of the high-temperature concentrated solution Sh3 (high-temperature regenerator solution outlet temperature) could be 180.0 ° C. or less, which is preferable for preventing corrosion of the high-temperature regenerator G3.

1 is a schematic system diagram showing an absorption refrigerator according to an embodiment of the present invention. It is detail drawing of the high temperature regenerator G3. (A) is a longitudinal cross-sectional view, (b) is a plan view of a can body portion. It is a typical systematic diagram which shows the modification of the absorption refrigerator which concerns on embodiment of this invention. It is a partial systematic diagram which shows the triple effect absorption refrigerator which made the absorber and the evaporator multistage. It is a figure which shows the modification of the high temperature regenerator of the absorption refrigerator which concerns on embodiment of this invention. FIG. 6 is a partial system diagram of a solution system in which heat is recovered from the condensed refrigerant with a dilute solution sent to the intermediate temperature regenerator and the low temperature regenerator, and (a) is a low temperature solution heat exchanger and medium temperature condensed refrigerant solution heat exchange. And a partial system diagram in which a medium temperature solution heat exchanger and a high temperature condensing refrigerant solution heat exchanger are respectively arranged in series, (b) is a low temperature solution heat exchanger, a medium temperature condensing refrigerant solution heat exchanger, and a medium temperature solution heat exchanger And (c) is a low temperature solution heat exchanger and a medium temperature condensed refrigerant solution heat exchanger and a high temperature condensed refrigerant solution heat exchanger arranged in series. It is a partial distribution diagram arranged so that medium temperature solution heat exchangers may be arranged in parallel. It is a partial systematic diagram of the solution system | strain which heat-recovers from a condensed refrigerant | coolant with the low temperature concentrated solution sent to a high temperature regenerator. FIG. 4 is a partial system diagram of a solution system for recovering heat from exhaust gas discharged from a high-temperature regenerator into a dilute solution and a low-temperature concentrated solution, and (a) is a low-temperature solution heat exchanger, an exhaust gas solution heat exchanger, and an intermediate-temperature solution heat exchanger. And partial system diagram in which a high temperature solution heat exchanger and an exhaust gas solution heat exchanger are respectively arranged in series, (b) is a low temperature solution heat exchanger, an exhaust gas solution heat exchanger, and an intermediate temperature solution heat exchanger 2 is a partial system diagram in which an exhaust gas solution heat exchanger, a high temperature solution heat exchanger, and an exhaust gas solution heat exchanger are respectively arranged in parallel. It is a figure which shows the comparison of the item of the absorption refrigerator which concerns on embodiment of this invention, and the conventional absorption refrigerator. It is a figure which shows the item of the triple effect absorption refrigerator which made the absorber and the evaporator multistage. It is a typical system diagram which shows the triple effect absorption refrigerator which suppressed the raise of the temperature and pressure of the conventional high temperature regenerator. It is a typical system diagram which shows the triple effect absorption refrigerator which has the solution cycle of the conventional series flow. It is a typical system diagram which shows the triple effect absorption refrigerator which has the solution cycle of the conventional branch flow.

Explanation of symbols

1-3 Triple-effect absorption refrigerator 12 Medium temperature solution pump 13 High temperature solution pump 15 Low temperature solution pump 16 Flow rate adjusting valve (dilute solution introduction amount adjusting means)
21 Low temperature regenerator solution reservoir 22 Medium temperature regenerator solution reservoir 41 Dilute solution flow path 43 Low temperature concentrated solution flow path 60 Controller 62 Medium temperature pressure detector 63 High temperature pressure detector 64 Low temperature liquid level detector 65 Medium temperature liquid level detector 66A- 66D High temperature liquid level detector 68 Medium temperature refrigerant temperature detector 69 High temperature refrigerant temperature detector 85 High temperature regenerator solution reservoir A Absorber G1 Low temperature regenerator G2 Medium temperature regenerator G3 High temperature regenerator S Solution Sh1 Low temperature concentrated solution Sh3 High temperature concentrated solution Sh2 Medium temperature concentrated solution Sw Dilute solution Vf2 Medium temperature condensed refrigerant Vf3 High temperature condensed refrigerant Vs Refrigerant vapor

Claims (7)

An absorber that absorbs the refrigerant vapor with a solution and makes the solution a dilute solution with reduced concentration;
A low-temperature regenerator that introduces the dilute solution from the absorber and heats the dilute solution to evaporate the refrigerant to obtain a low-temperature concentrated solution having an increased concentration;
An intermediate temperature regenerator that introduces the dilute solution from the absorber and heats the dilute solution to evaporate the refrigerant at a higher temperature than in the low temperature regenerator to increase the concentration;
A high temperature regenerator that evaporates the refrigerant at a higher temperature than that in the intermediate temperature regenerator by introducing the low temperature concentrated solution from the low temperature regenerator and heating the low temperature concentrated solution;
An intermediate temperature solution pump for delivering the dilute solution in the absorber to the intermediate temperature regenerator;
A high temperature solution pump for feeding the low temperature concentrated solution in the low temperature regenerator to the high temperature regenerator;
Triple effect absorption refrigerator. The low-temperature regenerator has a low-temperature regenerator solution reservoir that stores the low-temperature concentrated solution, and the high-temperature solution pump is connected to a low-temperature concentrated solution channel that guides the low-temperature concentrated solution from the low-temperature regenerator solution reservoir to the high-temperature regenerator. Arranged;
The intermediate temperature regenerator has a medium temperature regenerator solution reservoir for storing a medium temperature concentrated solution having a concentration increased by evaporating refrigerant from the dilute solution;
The high temperature regenerator has a high temperature regenerator solution reservoir for storing a high temperature concentrated solution having an increased concentration by evaporating refrigerant from the low temperature concentrated solution;
Adjusting the discharge amount of the high-temperature solution pump so that the liquid level of the high-temperature concentrated solution in the high-temperature regenerator solution reservoir or in the main body of the high-temperature regenerator is a first predetermined liquid level; A control device for adjusting the discharge amount of the intermediate temperature solution pump so that the liquid level of the intermediate temperature concentrated solution in the intermediate temperature regenerator solution reservoir or in the main body of the intermediate temperature regenerator becomes a second predetermined liquid level; Prepare;
The triple effect absorption refrigerator according to claim 1. A high temperature pressure detector for detecting the pressure in the high temperature regenerator;
A high temperature liquid level detector for detecting a high liquid level and a low liquid level of the high temperature concentrated solution in the high temperature regenerator solution reservoir or in the main body of the high temperature regenerator;
An intermediate temperature pressure detector for detecting the pressure in the intermediate temperature regenerator;
An intermediate temperature liquid level detector for detecting a high level liquid level and a low level liquid level of the medium temperature concentrated solution in the intermediate temperature regenerator solution reservoir or in the main body of the intermediate temperature regenerator;
The control device adjusts the rotational speed of the high-temperature solution pump based on the pressure detected by the high-temperature pressure detector, and decreases the low-level liquid when the high-temperature liquid level detector detects the high-level liquid level. When the surface temperature is detected, the intermediate temperature liquid level detector detects the higher liquid level while adjusting the rotation speed of the intermediate temperature solution pump based on the pressure detected by the intermediate temperature pressure detector. Configured to be lowered and raised when the lower liquid level is detected;
The triple effect absorption refrigerator according to claim 2. In place of the high-temperature pressure detector, a high-temperature refrigerant temperature detector that detects the temperature of the high-temperature condensed refrigerant obtained by condensing the evaporated refrigerant by heating the low-temperature concentrated solution in the high-temperature regenerator;
In place of the intermediate temperature pressure detector, an intermediate temperature refrigerant temperature detector that detects the temperature of the intermediate temperature condensed refrigerant obtained by condensing the refrigerant evaporated by heating the diluted solution in the intermediate temperature regenerator;
The control device adjusts the rotational speed of the high temperature solution pump based on the temperature detected by the high temperature refrigerant temperature detector instead of the pressure detected by the high temperature pressure detector, and the pressure detected by the intermediate temperature pressure detector. Instead of the medium temperature refrigerant temperature detector is configured to adjust the rotational speed of the medium temperature solution pump based on the temperature detected by the medium temperature refrigerant temperature detector;
The triple effect absorption refrigerator according to claim 3. A dilute solution introduction amount adjustment for adjusting the flow rate of the dilute solution introduced into the low temperature regenerator so that the liquid level of the low temperature concentrated solution in the low temperature regenerator solution reservoir is equal to or higher than a third predetermined liquid level. Comprising means;
The triple effect absorption refrigerator according to any one of claims 2 to 4. The dilute solution introduction amount adjusting means is
A flow rate adjusting valve that is disposed in a dilute solution flow path that guides the dilute solution from the absorber to the low temperature regenerator, and that adjusts the flow rate of the dilute solution flowing in the dilute solution flow path;
A low-temperature liquid level detector for detecting whether or not the liquid level of the low-temperature concentrated solution in the low-temperature regenerator solution reservoir is equal to or higher than the third predetermined liquid level height;
And a controller that increases the opening of the flow rate adjusting valve when the liquid level of the low-temperature concentrated solution in the low-temperature regenerator solution reservoir is lower than the third predetermined liquid level height. ;
The triple effect absorption refrigerator according to claim 5. The dilute solution introduction amount adjusting means is
A low-temperature solution pump separate from the intermediate-temperature solution pump for feeding the dilute solution in the absorber to the low-temperature regenerator;
A low-temperature liquid level detector for detecting whether or not the liquid level of the low-temperature concentrated solution in the low-temperature regenerator solution reservoir is equal to or higher than the third predetermined liquid level height;
And a controller for increasing the rotational speed of the low temperature solution pump when the liquid level of the low temperature concentrated solution in the low temperature regenerator solution reservoir is lower than the third predetermined liquid level height. ;
The triple effect absorption refrigerator according to claim 5.

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