JP2008116172A - Absorption type refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent pump lock of an absorbing liquid pump by preventing deposition of a corrosion inhibitor included in the absorbing liquid, particularly, in a double-effect absorption type refrigerating machine. <P>SOLUTION: In this absorption type refrigerating machine wherein a thick absorbing liquid pump 10 is disposed at an upstream side of a low-temperature heat exchanger 7, of a pipe conduit R4 for supplying a thick absorbing liquid to an absorber 5 from a low-temperature regenerator 2 through the low-temperature heat exchanger 7, and a bypass pipe conduit 19 is disposed to return a part of the thick absorbing liquid distributed from the thick absorbing liquid pump 10 to the thick absorbing liquid pump 10 after passing through the low-temperature heat exchanger 7, the thick absorbing liquid pump 10 is invertor controlled to low rotation by a control device 14 when an operational load is lowered and the supply of the thick absorbing liquid from the low-temperature regenerator 2 is reduced, to prevent a part of the thick absorbing liquid distributed from the thick absorbing liquid pump 10, from being circulated to the thick absorbing liquid pump 10 through the bypass pipe conduit 19 after passing through the low-temperature heat exchanger 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an absorption refrigeration machine, and in particular, in a double-effect absorption chiller, absorption that prevents pump lock of an absorption liquid pump by suppressing precipitation of a corrosion inhibitor contained in the absorption liquid. It relates to a type refrigerator.

  In general, double-effect absorption refrigerators are connected to high-temperature regenerators, low-temperature regenerators, condensers, evaporators, absorbers and high-temperature heat exchangers, and low-temperature heat exchangers through pipe lines. In addition, a concentrated absorption liquid pump, a rare absorption liquid pump, a refrigerant liquid pump, an on-off valve, and the like are provided to constitute an absorption liquid circulation line and a refrigerant circulation line. Then, the cooling / refrigerating action is obtained by cooling the cold / warm water returned from the load side by the latent heat of evaporation of the refrigerant liquid in the evaporator and supplying it to the load side. In addition, an absorption refrigerator that can be heated not only by cooling but also by switching pipes is conventionally known. As the absorbing liquid, an aqueous lithium bromide solution is usually used, and water is used as the refrigerant.

  In a conventional absorption refrigerator, the concentrated absorption liquid pump is operated as long as the absorption refrigerator is operated, and the concentrated absorption liquid obtained by evaporating and separating the refrigerant in the low temperature regenerator is supplied to the absorber. Even if the heating in the high temperature regenerator is stopped with almost no condition, the concentrated absorbent supplied from the low temperature regenerator to the absorber is heated by the heat of the concentrated absorbent pump. For this reason, the temperature of the concentrated absorbent rises and crystallizes, and the pipe may be clogged, preventing the concentrated absorbent from circulating.

In order to prevent crystallization of the concentrated absorbent at low load as described above, for example, when the heating of the rare absorbent in the high temperature regenerator is stopped for a predetermined time, the operation of the concentrated absorbent pump is stopped and the high temperature regenerator is turned off. Patent Document 1 discloses a technique in which the operation of the concentrated absorption liquid pump is resumed after heating regeneration.
JP 2000-179976

  When the aqueous solution of lithium bromide is used as the absorption liquid of the absorption refrigerator as described above, the corrosion resistance is high, and therefore, a corrosion inhibitor (inhibitor) is mixed in the absorption liquid. This corrosion inhibitor is mainly composed of, for example, lithium molybdate, and is dissolved in the absorbing liquid during normal operation. However, the corrosion inhibitor partially precipitates in the absorbing liquid due to changes in the concentration and temperature of the absorbing liquid in accordance with operating conditions. There are things to do. If the corrosion inhibitor deposits in the absorbent, it will not only clog the pipeline and worsen the flow of the absorbent, but will also cause a situation such as accumulation in the concentrated absorbent pump that pumps out the absorbent and causing a pump lock. become.

  An object of the present invention is to provide an absorption refrigerator that prevents pump lock of a concentrated absorbent pump by suppressing the precipitation of a corrosion inhibitor in the absorbent.

  As means for achieving the above object, the invention of claim 1 is characterized in that a high temperature regenerator, a low temperature regenerator, an evaporator, an absorber, a high temperature heat exchanger, and a low temperature heat exchanger are connected by a pipe, A concentrated absorbent pump is provided on the upstream side of the low-temperature heat exchanger of the conduit for supplying the concentrated absorbent to the absorber via the low-temperature heat exchanger from the regenerator, and the concentrated absorbent liquid sent from the concentrated absorbent pump In an absorption refrigeration machine provided with a bypass line that partially returns to the concentrated absorbent pump after passing through a low-temperature heat exchanger, the operating load is reduced and the supply of concentrated absorbent from the low-temperature regenerator is reduced. In such a case, by controlling the concentrated absorbent pump at a low speed, a portion of the concentrated absorbent sent from the concentrated absorbent pump passes through the low-temperature heat exchanger and then passes through the bypass conduit. It is characterized in that it does not circulate.

  In the invention of claim 2, a high temperature regenerator, a low temperature regenerator, an evaporator, an absorber, a high temperature heat exchanger, and a low temperature heat exchanger are connected by a pipe line, and the absorber passes through the low temperature heat exchanger from the low temperature regenerator. A concentrated absorbent pump is provided on the upstream side of the low-temperature heat exchanger in the pipe for supplying the concentrated absorbent, and a part of the concentrated absorbent sent from the concentrated absorbent pump passes through the low-temperature heat exchanger. In the absorption refrigeration machine provided with a bypass line for returning to the concentrated absorption liquid pump, the downstream side of the refrigerant liquid pump in the line for supplying the refrigerant liquid from the evaporator to the refrigerant liquid spray pipe of the evaporator by the refrigerant liquid pump And a refrigerant liquid bypass line connecting the downstream side of the low-temperature heat exchanger in the line for supplying the concentrated absorption liquid from the low-temperature regenerator to the absorber through the low-temperature heat exchanger by the concentrated absorption liquid pump, and An open / close valve is installed in the refrigerant liquid bypass line to Sometimes, a portion of the refrigerant fluid from the evaporator, and supplying through the refrigerant liquid bypass conduit by the coolant pump.

  In the invention of claim 3, a high temperature regenerator, a low temperature regenerator, an evaporator, an absorber, a high temperature heat exchanger, and a low temperature heat exchanger are connected by a pipe line, and the absorber is passed through the low temperature heat exchanger from the low temperature regenerator. A concentrated absorbent pump is provided on the upstream side of the low-temperature heat exchanger in the pipe for supplying the concentrated absorbent, and a part of the concentrated absorbent sent from the concentrated absorbent pump passes through the low-temperature heat exchanger. In an absorption refrigeration machine provided with a bypass line for returning to the concentrated absorption liquid pump, the rare absorption liquid from the absorber is supplied to the high temperature regenerator through the low temperature heat exchanger and the high temperature heat exchanger by the rare absorption liquid pump. The downstream side of the rare absorbent pump in the pipeline is connected to the downstream side of the low temperature heat exchanger in the pipeline that supplies the concentrated absorbent from the low temperature regenerator to the absorber through the low temperature heat exchanger by the concentrated absorbent pump. While providing a rare absorbent bypass line, the rare absorption An on-off valve is provided in the bypass line, and when the load is low and the amount of concentrated absorbent sent from the concentrated absorbent pump is small, a part of the rare absorbent from the absorber is separated by the rare absorbent pump. It supplies through a rare absorption liquid bypass conduit.

  In the invention of claim 4, a high temperature regenerator, a low temperature regenerator, an evaporator, an absorber, a high temperature heat exchanger, and a low temperature heat exchanger are connected by a pipe line, and the absorber passes through the low temperature heat exchanger from the low temperature regenerator. A concentrated absorbent pump is provided on the upstream side of the low-temperature heat exchanger in the pipe for supplying the concentrated absorbent, and a part of the concentrated absorbent sent from the concentrated absorbent pump passes through the low-temperature heat exchanger. In an absorption refrigeration machine provided with a bypass line for returning to the concentrated absorption liquid pump, the rare absorption liquid from the absorber is supplied to the high temperature regenerator through the low temperature heat exchanger and the high temperature heat exchanger by the rare absorption liquid pump. A rare absorbent bypass pipe connecting the upstream side and the downstream side of the low-temperature heat exchanger in the pipeline is provided, and an open / close valve is provided in the rare absorbent bypass pipe to supply the rare absorbent liquid sent by the rare absorbent pump. Open and close when the temperature is low and the load is low Some of the diluted absorbent solution from the absorber open, and wherein the circulating the diluted absorption fluid bypass passage.

  In the invention of claim 5, a high temperature regenerator, a low temperature regenerator, an evaporator, an absorber, a high temperature heat exchanger, and a low temperature heat exchanger are connected by a pipe line, and the absorber passes through the low temperature heat exchanger from the low temperature regenerator. A concentrated absorbent pump is provided on the upstream side of the low-temperature heat exchanger in the pipe for supplying the concentrated absorbent, and a part of the concentrated absorbent sent from the concentrated absorbent pump passes through the low-temperature heat exchanger. In an absorption refrigeration machine provided with a bypass line for returning to the concentrated absorbent pump, the low temperature heat in the pipeline for supplying the concentrated absorbent from the low temperature regenerator to the absorber via the low temperature heat exchanger by the concentrated absorbent pump. A trap is provided on the downstream side of the exchanger and in front of the bypass line, and the trap has a function of separating the corrosion inhibitor deposited in the concentrated absorbent.

  According to the first aspect of the invention, in the dual effect absorption chiller, when the operating load is reduced and the supply amount of the concentrated absorbent from the low-temperature regenerator is reduced, the concentrated absorbent pump is rotated at a low speed. By controlling, a part of the concentrated absorbent delivered from the concentrated absorbent pump is prevented from circulating to the concentrated absorbent pump via the bypass line after passing through the low-temperature heat exchanger. Thereby, the pump lock of the concentrated absorbent pump can be prevented by suppressing the corrosion inhibitor deposited in the concentrated absorbent from flowing into the concentrated absorbent pump.

  According to the second aspect of the present invention, in the dual-effect absorption refrigerator, the downstream side of the refrigerant liquid pump in the pipeline that supplies the refrigerant liquid from the evaporator to the refrigerant liquid spray pipe of the evaporator by the refrigerant liquid pump; A refrigerant liquid bypass line connecting the downstream side of the low-temperature heat exchanger in the pipe for supplying the concentrated absorption liquid from the low-temperature regenerator to the absorber through the low-temperature heat exchanger by the concentrated absorption liquid pump, and the refrigerant Since the on-off valve is provided in the liquid bypass line, when the absorption refrigerator is started, the on-off valve is opened and a part of the refrigerant liquid from the evaporator is supplied via the refrigerant liquid bypass line by the refrigerant liquid pump. By accelerating the dissolution of the corrosion inhibitor deposited in the concentrated absorbent, the pump lock of the concentrated absorbent pump can be prevented.

  According to the third aspect of the invention, in the dual effect absorption refrigerator, the pipe for supplying the rare absorbent from the absorber to the high temperature regenerator through the low temperature heat exchanger and the high temperature heat exchanger by the rare absorbent pump A rare connection between the downstream side of the rare absorption pump in the channel and the downstream side of the low temperature heat exchanger in the pipeline that supplies the concentrated absorption liquid from the low temperature regenerator to the absorber through the low temperature heat exchanger by the concentrated absorption liquid pump Since the absorption liquid bypass pipe is provided, and the on / off valve is provided on the rare absorption liquid bypass line, the open / close valve is opened when the load of the concentrated absorption liquid sent from the concentrated absorption liquid pump is small at low load. Open and supply a part of the rare absorbent from the absorber through the rare absorbent bypass pipe by the rare absorbent pump, and reduce the concentration of the concentrated absorbent before the corrosion inhibitor precipitates. The concentrated absorbent pump by sending the concentrated absorbent to the absorber It is possible to prevent the pump lock.

  According to the fourth aspect of the present invention, in the dual effect absorption refrigerator, the pipe for supplying the rare absorbent from the absorber to the high temperature regenerator through the low temperature heat exchanger and the high temperature heat exchanger by the rare absorption liquid pump Since the rare absorption liquid bypass pipe connecting the upstream side and the downstream side of the low temperature heat exchanger in the passage is provided, and the on / off valve is provided in the rare absorption liquid bypass pipe, the rare absorption liquid sent by the rare absorption liquid pump When the temperature is low and the load is low, the on-off valve is opened and a part of the rare absorbent from the absorber is circulated through the rare absorbent bypass pipe to suppress the precipitation of the corrosion inhibitor. The pump lock of the liquid pump can be prevented.

  According to the invention of claim 5 above, in the dual effect absorption chiller, the low temperature heat exchange in the pipeline for supplying the concentrated absorption liquid from the low temperature regenerator to the absorber through the low temperature heat exchanger by the concentrated absorption liquid pump Since a trap is provided on the downstream side of the vessel and on the front side of the bypass pipe, and the trap has a function of separating the corrosion inhibitor deposited in the concentrated absorbent, the corrosion inhibition deposited from the concentrated absorbent is suppressed. By eliminating the agent, the pump lock of the concentrated absorbent pump can be prevented.

  Hereinafter, an absorption refrigerator according to an embodiment of the present invention will be described with reference to the accompanying drawings. For example, as shown in FIG. 1, the double effect absorption refrigerator includes a high temperature regenerator 1, a low temperature regenerator 2, a condenser 3, an evaporator 4, an absorber 5, a high temperature heat exchanger 6, a low temperature heat exchanger 7, and the like. Are connected by a pipe line to constitute an absorption liquid system circulation path and a refrigerant system circulation path.

  In the high-temperature regenerator 1, the rare absorbent returned from the absorber 5 by the rare absorbent pump 8 through the pipe line R1 is accommodated, and this rare absorbent is heated by the burner 9 to be contained in the rare absorbent. The refrigerant liquid is vaporized and separated. As a result, the rare absorption liquid becomes a medium concentration absorption liquid, and is supplied to the low temperature regenerator 2 via the pipe line R2. However, when the rare absorption liquid passes through the high temperature heat exchanger 6, the rare absorption liquid flows through the pipe line R1. The heat is dissipated by exchanging heat between them and stored in the low temperature regenerator 2. On the other hand, the evaporated refrigerant vapor is supplied to the condenser 3 via the pipe line R3, but when passing through the low-temperature regenerator 2, the refrigerant vapor is exchanged with the medium-concentrated absorbent contained in the low-temperature regenerator 2. By heat exchange, the heat is dissipated to become a gas-liquid mixed liquid, and then liquefied to become a refrigerant liquid and accommodated in the bottom of the condenser 3.

  In the low temperature regenerator 2, the medium concentrated absorbent supplied from the high temperature regenerator 1 is heated by the refrigerant vapor passing through the low temperature regenerator 2, and the refrigerant liquid in the medium concentrated absorbent is vaporized and evaporated. Separated. As a result, the medium-concentrated absorbent becomes a concentrated absorbent and is supplied to the absorber 5 through the conduit R4 by the concentrated absorbent pump 10, but when passing through the low-temperature heat exchanger 7, the high-temperature regenerator 1 The heat is exchanged with the rare absorption liquid flowing through the pipe line R <b> 1 toward the heat sink, and the heat is radiated and supplied to the absorption liquid spray pipe 5 a of the absorber 5. On the other hand, the refrigerant vapor evaporated in the low temperature regenerator 2 passes over the upper part of the partition wall and flows into the condenser 3 side.

  In the condenser 3, the refrigerant vapor flowing from the low-temperature regenerator 2 is cooled and liquefied by the cooling water passing through the condenser 3, and accumulates at the bottom of the condenser 3. The cooling water is supplied through a cooling water pipe 11 passing through the condenser 3 after passing through the absorber 5.

  In the evaporator 4, the refrigerant liquid accumulated at the bottom of the condenser 3 is supplied through the pipe R 5, and is supplied from the refrigerant liquid pump 12 to the refrigerant liquid spray pipe 4 a through the pipe R 6. The refrigerant liquid sprayed from the refrigerant liquid spraying pipe 4a is heated and evaporated by exchanging heat with the cold / hot water flowing through the cold / hot water pipe 13 passing through the evaporator 4. The cold / hot water flowing through the cold / hot water pipe 13 is cooled by the latent heat of vaporization and supplied from the evaporator 4 to a load (not shown) such as a refrigerator. From the load side, cold / hot water whose temperature has risen is returned to the evaporator 4 and circulated. On the other hand, the refrigerant vapor evaporated in the evaporator 4 flows into the absorber 5 through the partition slit portion.

  In the absorber 5, the concentrated absorbent dispersed from the absorbent dispersion pipe 5a is cooled by the cooling water flowing through the cooling water pipe 11, and the refrigerant vapor is absorbed by the cooled concentrated absorbent. When the liquid temperature of the concentrated absorbent is low, the refrigerant vapor absorption capacity is improved. The concentrated absorbent that has absorbed the refrigerant vapor becomes a rare absorbent and accumulates at the bottom of the absorber 5. The rare absorbent stored at the bottom of the absorber 5 is returned to the high-temperature regenerator 1 via the pipe R1 by the rare-absorbent liquid pump 8, but is regenerated at a low temperature when passing through the low-temperature heat exchanger 7 on the way. Heat is exchanged between the intermediate temperature concentrated absorbent flowing from the regenerator 2 toward the absorber 5 and heated, and then the high temperature flowing from the high temperature regenerator 1 toward the low temperature regenerator 2 when passing through the high temperature heat exchanger 6 After heat exchange with the concentrated absorbent and reheating, it is returned to the high temperature regenerator 1.

  As a result, the high temperature regenerator 1 → (R2) → low temperature regenerator 2 → (R4) → absorber 5 → (R1) → the circulation path of the absorbent system circulating to the high temperature regenerator 1 and the high temperature regenerator 1 → (R3) → condenser 3 → (R5) → evaporator 4 → (R6) → evaporator 4 → absorber 5 → (R1) → refrigerant system circulation path circulating to the high-temperature regenerator 1 is configured. .

  FIG. 2 is a configuration diagram showing a first embodiment of an absorption refrigerator according to the present invention. The present embodiment is based on the configuration of the absorption refrigerator (FIG. 1), and the same components as those of the absorption refrigerator are denoted by the same reference numerals and detailed description thereof is omitted.

  The present embodiment is characterized in that the concentrated absorbent pump 10 is rotationally controlled by a control device 14. The concentrated absorbent pump 10 includes a motor that is inverter-controlled by the control device 14, and the number of rotations is changed depending on the operation state. Then, the internal temperature of the high temperature regenerator 1 detected by the thermometer 15 provided in the high temperature regenerator 1 is input to the control device 14.

  When the operating load of the absorption chiller decreases, the opening of the fuel supply valve 17 and the combustion air supply valve 18 are controlled by the control valve 16 and the amount of fuel and combustion air supplied to the burner 9 is reduced. Or the supply is stopped. The detected temperature by the thermometer 15 decreases with the low combustion of the burner 9 or the combustion stop, the detection signal is input to the control device 14, and the command signal is output from the control device 14, and the concentrated absorbent pump Inverter control of 10 to low rotation.

  When the rotational speed of the concentrated absorbent pump 10 decreases, the supply amount of the concentrated absorbent supplied from the low temperature regenerator 2 to the absorber 5 via the pipe R4 decreases, and the pressure loss of the concentrated absorbent increases. To do. Therefore, after passing through the low-temperature heat exchanger 7 in the pipeline R4, the concentrated absorbent is passed through the bypass pipeline 19 connecting the upstream side of the concentrated absorbent pump 10 and the downstream side of the low-temperature heat exchanger 7. Can be prevented from circulating to the concentrated absorbent pump 10. As a result, the concentrated absorbent dissipates heat by passing through the low temperature heat exchanger 7 and flows into the concentrated absorbent pump 10 via the bypass line 19 even if the corrosion inhibitor is deposited in the concentrated absorbent. Can be suppressed.

  According to the present embodiment, when the operation load is reduced and the supply amount of the concentrated absorbent from the low-temperature regenerator 2 is decreased, the concentrated absorbent pump 10 is subjected to inverter control so as to rotate at a low speed, thereby the concentrated absorbent. A part of the concentrated absorbent pumped out from the pump 10 is prevented from circulating to the concentrated absorbent pump 10 via the bypass line 19 after passing through the low-temperature heat exchanger 7, thereby pumping the concentrated absorbent pump 10. Locking can be prevented.

  FIG. 3 shows an example of the inverter control method of the concentrated absorbent pump 10, and is a graph showing the relationship between the temperature of the high temperature regenerator 1 and the frequency of the concentrated absorbent pump 10. The frequency of the concentrated absorbent pump 10 can be determined based on the temperature of the high-temperature regenerator 1.

  FIG. 4 is a configuration diagram showing a second embodiment of an absorption refrigerator according to the present invention. The present embodiment is based on the configuration of the absorption chiller (FIG. 1), and the same components as those of the absorption chiller are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the refrigerant liquid from the evaporator 4 is supplied to the refrigerant liquid spraying pipe 4a of the evaporator 4 by the refrigerant liquid pump 12 on the downstream side of the refrigerant liquid pump 12 and from the low temperature regenerator 2. A refrigerant liquid bypass line 20 is provided to connect the concentrated absorbent to the downstream side of the low-temperature heat exchanger 7 in the line R4 for supplying the concentrated absorbent to the absorber 5 via the low-temperature heat exchanger 7 by the concentrated absorbent pump 10, and A feature of the present invention is that the on-off valve 21 is provided in the refrigerant liquid bypass line 20.

  When the absorption refrigerator is started, the burner 9 of the high-temperature regenerator 1 is ignited to heat the rare absorbent contained in the high-temperature regenerator 1 to evaporate and separate the refrigerant liquid. The medium concentrated absorbent is supplied to the low temperature regenerator 2 through the pipe line R2. When the amount of concentrated absorbent stored at the bottom of the low-temperature regenerator 2 is insufficient, the amount of concentrated absorbent supplied to the absorber 5 by the concentrated absorbent pump 10 decreases. When the supply amount of the concentrated absorbent decreases, the heat is dissipated by passing through the low-temperature heat exchanger 7, and the temperature drop of the concentrated absorbent is increased, so that the corrosion inhibitor in the concentrated absorbent is easily deposited.

  At such time, the on-off valve 21 is opened and a part of the refrigerant liquid is supplied to the downstream side of the low-temperature heat exchanger 7 in the pipe line R4 through the refrigerant liquid bypass pipe 20 by the refrigerant liquid pump 12. . By supplying the refrigerant liquid, it is possible to dissolve the corrosion inhibitor deposited in the concentrated absorbent and crystals generated in the concentrated absorbent. Thereby, the pump lock of the concentrated absorbent pump 10 can be prevented by suppressing the corrosion inhibitor deposited in the concentrated absorbent from flowing into the concentrated absorbent pump 10 via the bypass line 19.

  The supply of the refrigerant liquid to the pipe line R4 via the refrigerant liquid bypass pipe 20 is preferably controlled for a fixed time (5 to 10 minutes) by a timer (not shown) or the like. For example, the operation of the concentrated absorbent pump 10 is started 5 minutes after the start-up, and the refrigerant liquid is supplied to the pipeline R4 side by the refrigerant liquid pump 12 during the 5 minutes. If the supply amount of the refrigerant liquid is too large, the decrease in the refrigerant liquid collected at the bottom of the evaporator 4 becomes large. As a result, the amount of refrigerant liquid supplied to the refrigerant liquid spray pipe 4a of the evaporator 4 by the refrigerant liquid pump 12 via the pipe line R6 is insufficient, and the function of cooling the cold / hot water is lowered. The on-off valve 21 is preferably an electromagnetic valve so that it can be controlled by a control device (not shown).

  FIG. 5 is a block diagram showing a third embodiment of an absorption refrigerator according to the present invention. The present embodiment is based on the configuration of the absorption chiller (FIG. 1), and the same components as those of the absorption chiller are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the rare absorbent pump 8 in the pipe line R1 that supplies the rare absorbent from the absorber 5 to the high temperature regenerator 1 through the low temperature heat exchanger 7 and the high temperature heat exchanger 6 by the rare absorbent pump 8 is used. Rarely connecting the downstream side of the low temperature heat exchanger 7 and the downstream side of the low temperature heat exchanger 7 in the pipe R4 for supplying the concentrated absorbent from the low temperature regenerator 2 to the absorber 5 through the low temperature heat exchanger 7 by the concentrated absorbent pump 10 The present invention is characterized in that an absorption liquid bypass line 22 is provided and an opening / closing valve 23 is provided in the rare absorption liquid bypass line 22.

  When the operation of the absorption refrigerator is at a low load and the amount of concentrated absorbent supplied to the absorber 5 from the low-temperature regenerator 2 via the concentrated absorbent pump 10 is small, the low-temperature heat exchanger The heat is dissipated by passing through 7, and the corrosion inhibitor in the concentrated absorbent is easily deposited. At such time, a part of the rare absorbent returned to the high temperature regenerator 1 by the rare absorbent pump 8 by opening the on-off valve 23 is passed through the rare absorbent bypass pipe 22 at a low temperature in the pipe R4. Supply to the downstream side of the heat exchanger 7. By supplying the rare absorbent, the corrosion inhibitor is prevented from being precipitated and some crystals are not generated in the concentrated absorbent. Thereby, the pump lock of the concentrated absorbent pump 10 can be prevented by sending the concentrated absorbent to the absorber 5 before the precipitation of the corrosion inhibitor and the crystals of the concentrated absorbent are generated. Note that a thermometer 24 for detecting the temperature of the rare absorbent is provided between the rare absorbent pump 8 and the branch bypass pipe 22 inlet in the pipe R1.

  FIG. 6 is a graph showing a temperature range in which precipitation of the corrosion inhibitor and crystallization of the concentrated absorbent occur easily. According to this graph, the temperature range where precipitation of corrosion inhibitor and crystallization of concentrated absorbent is likely to occur is within the range where the high temperature regenerator temperature is 110 ° C. or lower and the rare absorbent temperature is 25 ° C. or lower (shaded area). is there. When the temperature is in the temperature range S, a part of the rare absorbent is supplied to the concentrated absorbent to prevent precipitation of the corrosion inhibitor and crystallization of the concentrated absorbent. For example, the rare absorbent is supplied for a certain period of time (1 minute as a guide), and if it does not go out of the hatched area after 60 minutes, the rare absorbent is again supplied for 1 minute.

  FIG. 7 is a block diagram showing a fourth embodiment of the absorption refrigerator according to the present invention. The present embodiment is based on the configuration of the absorption chiller (FIG. 1), and the same components as those of the absorption chiller are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the low-temperature heat exchanger 7 in the pipe line R1 that supplies the rare absorbent from the absorber 5 to the high-temperature regenerator 1 through the low-temperature heat exchanger 7 and the high-temperature heat exchanger 6 by the rare-absorbent liquid pump 8. A rare absorption liquid bypass pipe 25 connecting the upstream side and the downstream side is provided, and an on-off valve 26 is provided in the absorption liquid bypass pipe 25.

  When the operation of the absorption refrigerator is at a low load and the amount of concentrated absorbent supplied from the low-temperature regenerator 2 to the absorber 5 through the concentrated absorbent pump 10 is small, the on-off valve 26 And a part of the rare absorbent returned to the high temperature regenerator 1 by the rare absorbent pump 8 is circulated through the rare absorbent bypass pipe 25. Thereby, the liquid volume of the rare absorption liquid which distribute | circulates the low temperature heat exchanger 7 is decreased, the temperature fall by the thermal radiation of the concentrated absorption liquid which passes the said low temperature heat exchanger 7 is relieve | moderated, precipitation of a corrosion inhibitor and concentrated absorption By suppressing the crystallization of the liquid, the pump lock of the concentrated absorbent pump 10 can be prevented. In this case, the on-off valve 26 is preferably a solenoid valve. Further, a low temperature regenerator thermometer 27 and an inlet side thermometer 28 of the concentrated absorbent pump 10 are provided in the pipe line R4.

  FIG. 8 is a block diagram showing a fifth embodiment of the absorption refrigerator according to the present invention. The present embodiment is based on the configuration of the absorption chiller (FIG. 1), and the same components as those of the absorption chiller are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the trap 29 is provided downstream of the low-temperature heat exchanger 7 in the pipeline R4 for supplying the concentrated absorbent from the low-temperature regenerator 2 to the absorber 5 through the low-temperature heat exchanger 7 by the concentrated absorbent pump 10. The trap 29 is characterized in that it has a function of separating the corrosion inhibitor deposited in the concentrated absorbent.

  For example, as shown in FIG. 9, the trap 29 includes a bent conduit 29a that is bent a plurality of times in the vertical direction, and an inlet 29b is provided at a lower portion of one end of the bent conduit 29a, and the other end. An outlet 29c is provided at the top of the tube, a storage portion 29d is provided at the bottom of the middle portion of the bent conduit 29a, and a plug 29e is detachably attached to the bottom of the storage portion 29d. The trap 29 is not limited to the one having the above configuration, and may be, for example, U-shaped or S-shaped, or any other appropriate shape.

  Even if the concentrated absorbent supplied from the low-temperature regenerator 2 to the absorber 5 passes through the low-temperature heat exchanger 7 to dissipate heat and deposit a corrosion inhibitor, and even if a part of the concentrated absorbent becomes crystals. These flow into the inlet 29b of the trap 29 together with the concentrated absorbent. The concentrated absorbent that has flowed into the trap 29 flows through the bent pipe 29a, flows into the pipe R4 from the outlet 29c, and the flow toward the absorber 5 is caused by the corrosion inhibitor and the concentrated precipitated in the concentrated absorbent. The crystals of the absorbing liquid fall into the housing part 29d and do not flow into the pipe line R4 from the outlet 29c. This prevents the deposited corrosion inhibitor and concentrated absorbent crystals from flowing into the concentrated absorbent pump 10 via the bypass pipe 19, thereby preventing pump lock of the concentrated absorbent pump 10. it can.

  The storage portion 29d of the trap 29 stores the deposited corrosion inhibitor and concentrated absorption liquid crystal, and the storage amount gradually increases. Therefore, the plug 29e is removed during regular maintenance to discharge the stored material. To do. After discharging the contents, the plug 29e is fitted and returned.

  The present invention can be applied particularly to a double-effect absorption refrigerator, and the pump lock of the absorption liquid pump can be prevented by suppressing the precipitation of the corrosion inhibitor in the absorption liquid.

It is a block diagram which shows an example of a double effect absorption type refrigerator. It is a lineblock diagram showing a 1st embodiment of an absorption refrigerating machine concerning the present invention. It is an example which shows an example of the inverter control method of a concentrated absorbent pump, and is a graph which shows the relationship between high temperature regenerator temperature and the frequency of a concentrated absorbent pump. It is a block diagram which shows 2nd Embodiment of the absorption refrigerator which concerns on this invention. It is a block diagram which shows 3rd Embodiment of the absorption refrigerator which concerns on this invention. It is a graph which shows the temperature range where precipitation of a corrosion inhibitor and the crystal | crystallization of a concentrated absorption liquid are easy to occur. It is a block diagram which shows 4th Embodiment of the absorption refrigerator which concerns on this invention. It is a block diagram which shows 5th Embodiment of the absorption refrigerator which concerns on this invention. It is a schematic sectional drawing which shows an example of a trap.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High temperature regenerator 2 Low temperature regenerator 3 Condenser 4 Evaporator 5 Absorber 6 High temperature heat exchanger 7 Low temperature heat exchanger 8 Rare absorption liquid pump 9 Burner 10 Concentrated absorption liquid pump 11 Cooling water line 12 Refrigerant liquid pump 13 Cold / hot water pipe Path 14 Control device 15 Thermometer 16 Control valve 17 Fuel supply valve 18 Combustion air supply valve 19 Bypass line 20 Refrigerant liquid bypass line 21 Open / close valve 22 Rare absorbent bypass pipe 23 Open / close valve 24 Thermometer 25 Rare absorbent bypass Pipe line 26 On-off valve 27, 28 Thermometer 29 Trap

Claims (5)

  A high-temperature regenerator, a low-temperature regenerator, an evaporator, an absorber, a high-temperature heat exchanger, and a low-temperature heat exchanger are connected by a pipe, and the concentrated absorbent is supplied from the low-temperature regenerator to the absorber via the low-temperature heat exchanger. A bypass is provided with a concentrated absorbent pump upstream of the low-temperature heat exchanger in the pipeline, and a part of the concentrated absorbent sent from the concentrated absorbent pump is returned to the concentrated absorbent pump after passing through the low-temperature heat exchanger. In the absorption chiller provided with the pipeline, when the operation load is reduced and the supply amount of the concentrated absorbent from the low-temperature regenerator is reduced, the concentrated absorbent pump is controlled to be at a low rotation speed. An absorption refrigerator, wherein a part of the concentrated absorbent sent from the concentrated absorbent pump is not circulated to the concentrated absorbent pump via the bypass line after passing through the low-temperature heat exchanger.   A high-temperature regenerator, a low-temperature regenerator, an evaporator, an absorber, a high-temperature heat exchanger, and a low-temperature heat exchanger are connected by a pipe, and the concentrated absorbent is supplied from the low-temperature regenerator to the absorber via the low-temperature heat exchanger. A bypass is provided with a concentrated absorbent pump upstream of the low-temperature heat exchanger in the pipeline, and a part of the concentrated absorbent sent from the concentrated absorbent pump is returned to the concentrated absorbent pump after passing through the low-temperature heat exchanger. In the absorption refrigerator provided with the pipe, the refrigerant liquid from the evaporator is supplied to the refrigerant liquid spray pipe of the evaporator by the refrigerant liquid pump on the downstream side of the refrigerant liquid pump and from the low temperature regenerator. Provide a refrigerant liquid bypass line connecting the downstream side of the low-temperature heat exchanger in the pipe that supplies the concentrated absorbent to the absorber through the low-temperature heat exchanger by the concentrated absorbent pump, and open and close the refrigerant liquid bypass line. Provided with a valve, when starting, the evaporator Part of the refrigerant liquid et al., The absorption refrigerator and supplying via the refrigerant liquid bypass conduit by the coolant pump.   A high-temperature regenerator, a low-temperature regenerator, an evaporator, an absorber, a high-temperature heat exchanger, and a low-temperature heat exchanger are connected by a pipe, and the concentrated absorbent is supplied from the low-temperature regenerator to the absorber via the low-temperature heat exchanger. A bypass is provided with a concentrated absorbent pump upstream of the low-temperature heat exchanger in the pipeline, and a part of the concentrated absorbent sent from the concentrated absorbent pump is returned to the concentrated absorbent pump after passing through the low-temperature heat exchanger. In an absorption chiller provided with a pipeline, a rare absorbent pump in a pipeline for supplying a rare absorbent from the absorber to a high temperature regenerator through a low temperature heat exchanger and a high temperature heat exchanger by means of a rare absorbent pump A rare absorption liquid bypass line connecting the downstream side of the low temperature heat exchanger and the downstream side of the low temperature heat exchanger in the line for supplying the concentrated absorption liquid from the low temperature regenerator to the absorber through the low temperature heat exchanger by the concentrated absorption liquid pump And open to the rare absorbent bypass line. When a low load is applied and the amount of concentrated absorbent sent from the concentrated absorbent pump is small, a part of the rare absorbent from the absorber is diluted by the rare absorbent pump. Absorption-type refrigerator characterized by supplying through a path.   A high-temperature regenerator, a low-temperature regenerator, an evaporator, an absorber, a high-temperature heat exchanger, and a low-temperature heat exchanger are connected by a pipe, and the concentrated absorbent is supplied from the low-temperature regenerator to the absorber via the low-temperature heat exchanger. A bypass is provided with a concentrated absorbent pump upstream of the low-temperature heat exchanger in the pipeline, and a part of the concentrated absorbent sent from the concentrated absorbent pump is returned to the concentrated absorbent pump after passing through the low-temperature heat exchanger. In an absorption refrigerator having a pipe line, a low-temperature heat exchanger in a pipe for supplying a rare absorption liquid from the absorber to a high-temperature regenerator through a low-temperature heat exchanger and a high-temperature heat exchanger by a rare absorption liquid pump A rare absorption liquid bypass line connecting the upstream side and the downstream side of the liquid is provided, and an opening / closing valve is provided in the rare absorption liquid bypass line to reduce the temperature of the rare absorption liquid sent by the rare absorption liquid pump and reduce the load. Open the on-off valve when Absorption refrigerating machine part of diluted absorbent solution, wherein the circulating the diluted absorption fluid bypass passage.   A high-temperature regenerator, a low-temperature regenerator, an evaporator, an absorber, a high-temperature heat exchanger, and a low-temperature heat exchanger are connected by a pipe, and the concentrated absorbent is supplied from the low-temperature regenerator to the absorber via the low-temperature heat exchanger. A bypass is provided with a concentrated absorbent pump upstream of the low-temperature heat exchanger in the pipeline, and a part of the concentrated absorbent sent from the concentrated absorbent pump is returned to the concentrated absorbent pump after passing through the low-temperature heat exchanger. In an absorption refrigerator provided with a pipe, the concentrated absorbent from the low-temperature regenerator is downstream of the low-temperature heat exchanger in a pipe that supplies the absorbent to the absorber via a low-temperature heat exchanger by a concentrated absorbent pump. An absorption refrigerator having a function of separating a corrosion inhibitor deposited in a concentrated absorbent by providing a trap on the front side of the bypass pipe.

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