JP4322690B2 - Absorption type water heater - Google Patents

Description

  The present invention relates to a parallel flow double-effect absorption chiller / heater using exhaust gas from a cogeneration system. Here, the absorption chiller / heater includes an absorption chiller.

  Conventionally, as one of absorption chiller / heaters used as heat source devices such as air conditioners, there is a parallel flow double-effect absorption chiller / heater using exhaust gas from a cogeneration device (see, for example, Patent Document 1). Hereinafter, a conventional absorption chiller / heater will be described with reference to FIGS. 4 and 5.

  In FIG. 4, reference numeral 1 denotes an exhaust gas regenerator, which passes through an exhaust pipe 3 of a cogeneration device 2 such as a generator for power generation. The rare absorbent (lithium bromide aqueous solution) is heated using exhaust gas as a heat source, and the refrigerant (water) is evaporated and separated from the rare absorbent to concentrate the rare absorbent. Reference numeral 4 denotes a low temperature regenerator, which concentrates the rare absorbent at a lower temperature than the exhaust gas regenerator 1 using the refrigerant vapor evaporated and separated from the rare absorbent in the exhaust gas regenerator 1 as a heat source. A condenser 5 flows cooling water through the first heat transfer pipe 6a that is passed through the inside, and the refrigerant vapor evaporated and separated in the exhaust gas regenerator 1 and the low temperature regenerator 4 is condensed and liquefied by the cooling water. Reference numeral 7 denotes an evaporator. The refrigerant liquid condensed in the condenser 5 is sprayed on the second heat transfer pipe 6b passed through the evaporator, and evaporated under vacuum, and the heat of vaporization flows in the second heat transfer pipe 6b. Recover from cold water and cool the cold water. 8 is an absorber which condenses the refrigerant vapor evaporated in the evaporator 7 and absorbs it in the concentrated absorbent concentrated in the exhaust gas regenerator 1 and the low temperature regenerator 4 to generate a rare absorbent. 9 is a low-temperature heat exchanger, which is concentrated in the exhaust gas regenerator 1 and the low temperature regenerator 4 and combined with the concentrated absorption liquid while being supplied from the exhaust gas regenerator 1 and the low temperature regenerator 4 to the absorber 8; The heat exchange with the diluted absorbent that is diluted in step 1 and supplied in parallel to the exhaust gas regenerator 1 and the low temperature regenerator 4 is performed. Reference numeral 10 denotes a high-temperature heat exchanger, which is concentrated in the exhaust gas regenerator 1 and supplied to the low-temperature heat exchanger 9, and diluted in the absorber 8 and supplied to the exhaust gas regenerator 1 through the low-temperature heat exchanger 9. Heat exchange with the diluted absorbent. In the accompanying drawings, the absorption liquid piping is indicated by a solid line with an arrow, the refrigerant vapor piping is indicated by a one-dot chain line with an arrow, and the refrigerant liquid piping is indicated by a two-dot chain line with an arrow. The piping for use is indicated by a broken line with an arrow.

  The conventional absorption chiller / heater is a double-effect type in which the concentration of a rare absorbent whose concentration has been reduced by absorbing the refrigerant by the absorber 8 is reduced by the two regenerators of the exhaust gas regenerator 1 and the low temperature regenerator 4. In addition, the rare absorbent is supplied from the absorber 8 to the exhaust gas regenerator 1 and the low temperature regenerator 4 in parallel, and the concentrated absorbent concentrated in the two regenerators 1 and 4 is merged and returned to the absorber 8. The parallel flow system uses the exhaust gas from the cogeneration system 2 effectively as a heat source for concentrating the rare absorbent in the exhaust gas regenerator 1.

  When the exhaust gas from the cogeneration apparatus 2 is effectively used as a heat source for the exhaust gas regenerator 1, it is necessary to pay attention to the exhaust gas temperature when it is discharged from the absorption chiller / heater. As shown in FIG. 5, the conventional absorption chiller / heater discharges the exhaust gas of the cogeneration apparatus 2 supplied from above the absorption chiller / heater upward from the absorption chiller / heater. In such a configuration, when the exhaust gas of the cogeneration apparatus 2 discharged from the conventional absorption chiller / heater is condensed in the exhaust pipe 3, the condensed liquid of the exhaust gas flows back in the exhaust pipe 3, and the absorption chiller / heater There is a possibility that the exhaust pipe 3 passing through the inside of the pipe is corroded. In order to prevent the backflow of the exhaust gas condensate and improve the durability of the absorption chiller / heater, conventionally, the exhaust gas of the cogeneration system 2 is discharged from the exhaust gas regenerator 1 to a dew point temperature (for example, about 70 to 80 ° C.). The exhaust gas is discharged at a sufficiently high temperature, that is, approximately the same temperature as the absorbing liquid in the exhaust gas regenerator 1 (for example, about 150 to 160 ° C.) so that the exhaust gas does not condense in the exhaust pipe 3. However, since the exhaust gas of the cogeneration apparatus 2 does not have to fall below the dew point temperature inside the absorption chiller / heater, heat is recovered to a temperature slightly higher than the dew point temperature (for example, about 90 to 120 ° C.). There is a demand for improving the economic efficiency and energy saving of chilled water heaters.

Japanese Patent Laid-Open No. 11-257781 (see FIG. 7)

  The present invention was devised in view of such circumstances, and its purpose is to increase the heat recovery efficiency of the exhaust gas of the cogeneration system and improve the economic efficiency and energy saving of the absorption chiller / heater. is there.

An absorption chiller / heater according to claim 1 of the present invention includes an exhaust gas regenerator for concentrating a rare absorbent using exhaust gas from a cogeneration system as a heat source, and refrigerant vapor evaporated and separated from the rare absorbent by the exhaust gas regenerator. A low-temperature regenerator for concentrating a rare absorbent as a heat source, a refrigerant vapor used as a heat source for the low-temperature regenerator, a condenser for condensing and liquefying the refrigerant vapor evaporated and separated from the rare absorbent in the low-temperature regenerator, and the condensation An evaporator that evaporates the refrigerant liquid condensed in the evaporator under vacuum, and the refrigerant vapor evaporated in the evaporator is absorbed into the concentrated absorbent concentrated in the exhaust gas regenerator and the low-temperature regenerator to generate a rare absorbent. And supplying a rare absorbent from the absorber to the exhaust gas regenerator and the low temperature regenerator in parallel, and concentrating and absorbing the concentrated absorbent concentrated in the exhaust gas regenerator and the low temperature regenerator. In the parallel flow type dual-effect absorption chiller / heater configured to return to the first, preheating of the diluted absorbent diluted with the absorber using the exhaust gas of the cogeneration apparatus used in the exhaust gas regenerator as a heat source is performed first. And the second exhaust gas heat exchanger are arranged in the order of the first and second exhaust gas heat exchangers in series with the exhaust gas regenerator with respect to the exhaust pipe for discharging the exhaust gas from the cogeneration system, and the first exhaust gas heat exchanger the diluted absorbent solution preheated at exchanger is supplied to the exhaust gas regenerator, the diluted absorption solution was pre-heated in the second exhaust gas heat exchanger so as to supply to the low-temperature regenerator, the cooling water of the cogeneration system And an exhaust heat recovery heat exchanger for exchanging heat with the diluted absorbent diluted with the absorber, and the diluted absorbent diluted with the absorber is used as the exhaust heat recovery heat exchanger and Characterized in that to the exhaust gas heat exchanger is supplied in parallel to said diluted absorption liquid is combined with the preheated by the exhaust heat recovery heat exchanger and a second exhaust gas heat exchanger so as to supply to the low temperature generator It is said.

The exhaust gas from the cogeneration system is discharged from the cogeneration system at about several hundred degrees Celsius, and is lowered from the exhaust gas regenerator to the same level as the temperature of the absorption liquid (for example, about several hundred degrees Celsius). Is done. In the first exhaust gas heat exchanger, the rare absorption liquid supplied to the exhaust gas regenerator is preheated to a temperature slightly lower than the absorption liquid in the exhaust gas regenerator, so that the exhaust gas from the cogeneration apparatus is absorbed in the exhaust gas regenerator. The liquid is discharged to a temperature lower than that of the liquid. The exhaust gas of the cogeneration apparatus discharged from the first exhaust gas heat exchanger is used for preheating the rare absorbent supplied to the low temperature regenerator in the second exhaust gas heat exchanger, and the dew point temperature of the exhaust gas (for example, 70 The temperature is lowered to a slightly higher temperature (for example, about 90 to 120 ° C.) and discharged. Thus, by using the exhaust gas of the cogeneration apparatus discharged from the exhaust gas regenerator for preheating the rare absorbent in the first and second exhaust gas heat exchangers, the dew point of the exhaust gas from the exhaust gas of the cogeneration apparatus is obtained. Heat can be recovered to a temperature slightly higher than the temperature. The exhaust gas regenerator that concentrates the rare absorbent at a high temperature is supplied with the rare absorbent preheated by the first exhaust gas heat exchanger, while the low temperature regenerator that concentrates the rare absorbent at a low temperature. Since the rare absorption liquid preheated by the second exhaust gas heat exchanger is supplied, the heat recovered from the exhaust gas of the cogeneration apparatus can be used without waste, and the economical efficiency and energy saving performance are improved. Furthermore, the exhaust heat recovery heat exchanger and the second exhaust gas heat exchanger preheat the rare absorbent supplied from the absorber to the low temperature regenerator. When the preheating of the rare absorbent is performed by the two heat exchangers of the exhaust heat recovery heat exchanger and the second exhaust gas heat exchanger, the heating is performed in comparison with the case of preheating only by the second exhaust gas heat exchanger. The efficiency is increased, and a predetermined amount of the rare absorbent can be easily preheated to a desired temperature, that is, slightly lower than the temperature of the absorbent in the low temperature regenerator. Further, since the amount of heat recovered from the heat source in each of the heat exchangers is suppressed, even if a rare absorption liquid having the same or lower temperature than the dew point temperature of the exhaust gas is supplied to the second exhaust gas heat exchanger, The rare absorption liquid can be preheated to a desired temperature without excessively recovering heat from the exhaust gas of the cogeneration system, and the exhaust gas of the cogeneration system can be exhausted from the second exhaust gas heat exchanger at a temperature slightly higher than the dew point temperature. Can be discharged. Furthermore, since the above absorption chiller / heater recovers heat not only from the exhaust gas of the cogeneration apparatus but also from the cooling water of the cogeneration apparatus, the economic efficiency and energy saving performance are further improved.

  The absorption chiller / heater according to claim 2 of the present invention is the absorption chiller / heater according to claim 1, wherein the absorption chiller / heater is diluted by the absorber and supplied to the exhaust gas regenerator and concentrated by the exhaust gas regenerator. A high-temperature heat exchanger that performs heat exchange with the concentrated absorbent supplied to the absorber, and the diluted absorbent diluted in the absorber is parallel to the high-temperature heat exchanger and the first exhaust gas heat exchanger And the rare absorption liquid preheated by the high-temperature heat exchanger and the first exhaust gas heat exchanger is combined and supplied to the exhaust gas regenerator.

  Both the high-temperature heat exchanger and the first exhaust gas heat exchanger preheat the rare absorbent supplied from the absorber to the exhaust gas regenerator to a temperature slightly lower than the absorbent in the exhaust gas regenerator. When the preheating of the rare absorbent is performed with the two heat exchangers of the high-temperature heat exchanger and the first exhaust gas heat exchanger, the heating efficiency is higher than when the preheating is performed only with the first exhaust gas heat exchanger. The predetermined amount of the rare absorbent can be easily preheated to a desired temperature, that is, slightly lower than the temperature of the absorbent in the exhaust gas regenerator. In addition, since the amount of heat recovered from the heat source in each of the above heat exchangers is suppressed, the heat recovered by the second exhaust gas heat exchanger into the exhaust gas of the cogeneration apparatus discharged from the first exhaust gas heat exchanger. Can leave enough. Thereby, the preheating function of the rare absorption liquid in the second exhaust gas heat exchanger is secured.

An absorption chiller / heater according to claim 3 of the present invention is the absorption chiller / heater according to claim 1 , wherein the diluted absorbent preliminarily heated by the exhaust heat recovery heat exchanger is used as an exhaust gas regenerator and a low temperature regenerator. And the rare absorbent pre-heated in the second exhaust gas heat exchanger is merged with the rare absorbent supplied from the exhaust heat recovery heat exchanger to the low-temperature regenerator. It is said.

  The temperature of the exhaust gas of the cogeneration apparatus supplied to the second exhaust gas heat exchanger can be appropriately set according to the heat recovery efficiency in the first exhaust gas heat exchanger, and the range is a temperature slightly higher than the dew point temperature. To a temperature slightly lower than the temperature of the absorbent in the exhaust gas regenerator. On the other hand, the temperature of the cooling water of the cogeneration apparatus supplied to the exhaust heat recovery heat exchanger is lower than the temperature of the exhaust gas of the cogeneration apparatus supplied to the second exhaust gas heat exchanger. As described above, if the temperatures of the cooling water and the exhaust gas of the cogeneration apparatus on the inlet side of each of the exhaust heat recovery heat exchanger and the second exhaust gas heat exchanger are different from each other, the exhaust heat recovery heat exchanger is more than the exhaust heat recovery heat exchanger. The rare absorption liquid preheated by the exhaust gas heat exchanger 2 has a higher temperature. When the temperature difference between the rare absorbent preheated by the exhaust heat recovery heat exchanger and the second exhaust gas heat exchanger is small, the rare absorbent preheated by the exhaust heat recovery heat exchanger is reduced to the exhaust gas regenerator side and the low temperature. Whether or not the rare absorbent preheated in the second exhaust gas heat exchanger is merged with the rare absorbent separated from the exhaust heat recovery heat exchanger and separated into the exhaust gas regenerator. The temperature is only sufficiently lower than the temperature of the absorbent in the exhaust gas regenerator. On the other hand, when the rare absorption liquid preheated in the second exhaust gas heat exchanger is joined to the rare absorption liquid supplied from the exhaust heat recovery heat exchanger to the low temperature regenerator, it is preheated in the exhaust heat recovery heat exchanger. The temperature of the diluted absorbent preliminarily heated by the second exhaust gas heat exchanger is approached by the amount of the diluted absorbent that is reduced by the diversion. Thus, when the temperature difference between the rare absorbents preheated by the exhaust heat recovery heat exchanger and the second exhaust gas heat exchanger is small, the rare absorption separated from the exhaust heat recovery heat exchanger to the low temperature regenerator side. When the rare absorbing liquid preheated by the second exhaust gas heat exchanger is joined to the liquid, the rare absorbing liquid supplied to the low temperature regenerator can be efficiently preheated.

An absorption chiller / heater according to claim 4 of the present invention is the absorption chiller / heater according to claim 1 , wherein the absorption chiller / heater is preheated by the exhaust heat recovery heat exchanger and the second exhaust gas heat exchanger. Are combined and supplied in parallel to the exhaust gas regenerator and the low temperature regenerator.

  As described above, when the temperature difference occurs in the rare absorbent preheated in each of the exhaust heat recovery heat exchanger and the second exhaust gas heat exchanger, and the temperature difference is large, the second exhaust gas heat The dilute absorbent preheated in the exchanger will have excess heat. In such a case, the rare absorption liquid preheated in the second exhaust gas heat exchanger is joined with the rare absorption liquid before being diverted from the exhaust heat recovery heat exchanger to the exhaust gas regenerator side and the low temperature regenerator side, This is used for preheating the rare absorbent that supplies the excess heat to the exhaust gas regenerator. Thereby, the rare absorption liquid supplied to the exhaust gas regenerator and the low temperature regenerator can be efficiently preheated.

An absorption chiller / heater according to claim 5 of the present invention is the absorption chiller / heater according to claim 1, wherein the exhaust pipe of the cogeneration apparatus is used as an exhaust gas regenerator and first and second exhaust gas heat exchangers. It is characterized by being incorporated in an L shape and supplying exhaust gas from the cogeneration system from above the exhaust gas regenerator and discharging it from the first and second exhaust gas heat exchangers in the horizontal direction.

The absorption chiller / heater according to claim 5 is configured as described above, and the exhaust gas of the cogeneration system is supplied from above and discharged in the horizontal direction, so that the exhaust gas is condensed outside the absorption chiller / heater. Even so, the condensate does not flow backward in the exhaust pipe toward the exhaust gas heat exchanger, and the exhaust pipe does not corrode inside the absorption chiller / heater. Therefore, heat can be recovered from the exhaust gas of the cogeneration apparatus to a temperature slightly higher than the dew point temperature (for example, about 90 to 120 ° C.) and discharged from the exhaust gas heat exchanger .

An absorption chiller-heater according to claim 6 of the present invention is the absorption chiller-heater according to claim 5 , wherein the outlet extends horizontally from the second exhaust gas heat exchanger of the exhaust pipe of the cogeneration system. A drain valve for discharging the condensed liquid of the exhaust gas is provided in the section.

According to the absorption chiller-heater according to claim 6, is provided with the drain valve from the second exhaust gas heat exchanger to the outlet portion of the exhaust pipe extending out horizontally, the exhaust gas of the cogeneration system is absorption type cold Even if the condensate is condensed in the exhaust pipe after being discharged from the water machine and the condensate accumulates in the vicinity of the outlet of the absorption chiller / heater, the condensate can be discharged from the drain valve. Can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, heat | fever can be collect | recovered from the waste gas of a cogeneration apparatus to the limit, and the economical efficiency and energy-saving property of an absorption-type cold water heater can be improved.

  The best mode for carrying out the absorption chiller / heater of the present invention will be described below with reference to the accompanying drawings. In the present embodiment, the same parts as those in the conventional example shown in FIG.

  FIG. 1 is a flowchart showing an absorption chiller / heater of the present invention. The absorption chiller / heater of the present invention is a double-effect absorption chiller / heater of the same parallel flow type as that of the conventional example shown in FIG. The rare absorption liquid is preheated by the first and second exhaust gas heat exchangers 11 and 12. In FIG. 1, 14 is a high-temperature regenerator, 15 is an exhaust heat recovery heat exchanger, 16 is an auxiliary evaporator, and the same components as those shown in FIG. Detailed description is omitted.

  The first exhaust gas heat exchanger 11 is arranged on the downstream side of the exhaust gas regenerator 1 with respect to the exhaust pipe 3 of the cogeneration device 2 such as a generator for power generation, and the first exhaust gas heat exchanger 11 of the cogeneration device 2 used in the exhaust gas regenerator 1. Exhaust gas is used as a heat source to preheat the diluted absorbent diluted in the absorber 8 and supplied via the low-temperature heat exchanger 9 and the exhaust heat recovery heat exchanger 15, and the diluted absorbent is supplied to the exhaust gas regenerator 1. To do.

  The second exhaust gas heat exchanger 12 is disposed on the downstream side of the first exhaust gas heat exchanger 11 with respect to the exhaust pipe 3 of the cogeneration apparatus 2 and is used in the exhaust gas regenerator 1 and the first exhaust gas heat exchanger 11. The exhaust gas from the cogeneration apparatus 2 is used as a heat source to pre-heat the diluted absorbent diluted with the absorber 8 and supplied through the low-temperature heat exchanger 9 and supply the diluted absorbent to the low-temperature regenerator 4. Is.

  In addition, in the exhaust gas regenerator 1, the first and second exhaust gas heat exchangers 11 and 12, the exhaust pipe 3 of the cogeneration apparatus 2 is incorporated in an L shape as shown in FIG. In the exhaust pipe 3 of the cogeneration apparatus 2, a drain valve 3 a is provided at an outlet extending in the horizontal direction from the second exhaust gas heat exchanger 12.

  As shown in FIG. 1, the high temperature regenerator 14 has a gas burner 17 for additional cooking, and the concentrated absorbent concentrated in the exhaust gas regenerator 1 is heated by the gas burner 17 to be further concentrated.

  The exhaust heat recovery heat exchanger 15 exchanges heat between the jacket cooling water of the cogeneration system 2 and the rare absorbent supplied from the absorber 8 to the exhaust gas regenerator 1 and the low temperature regenerator 4 and reserves the rare absorbent. It is for heating.

  The auxiliary evaporator 16 evaporates and separates the refrigerant from the concentrated absorbent concentrated in the exhaust gas regenerator 1 and the high temperature regenerator 14, and further concentrates the concentrated absorbent.

  Hereinafter, the operation of the absorption chiller / heater of the present invention will be described separately for the exhaust gas flow of the cogeneration apparatus 2 and the absorption liquid and refrigerant flows. In addition, about a refrigerant | coolant, the description which overlaps with the prior art example of FIG. 4, ie, the part which returns to the absorber 8 via the condenser 5 and the evaporator 7 from the low temperature regenerator 4 is abbreviate | omitted.

  The exhaust gas from the cogeneration device 2 is passed from the cogeneration device 2 to the inside of the exhaust gas regenerator 1, the first exhaust gas heat exchanger 11, and the second exhaust gas heat exchanger 12 as indicated by the white arrows in FIG. 1. Is exhausted through the exhaust pipe 3. As shown in FIG. 2, the exhaust gas discharged from the cogeneration apparatus 2 at about 500 ° C. is introduced from above the absorption chiller / heater and used in the exhaust gas regenerator 1 as a heat source for concentrating the rare absorbent. 1 to the exhaust gas heat exchanger 11. At this time, the heat of the exhaust gas is recovered to the same extent as the temperature of the rare absorbent in the exhaust gas regenerator 1 (for example, 150 to 160 ° C.). The exhaust gas supplied to the first exhaust gas heat exchanger 11 is used as a heat source for preheating the rare absorbent supplied from the absorber 8 to the exhaust gas regenerator 1 and supplied to the second exhaust gas heat exchanger 12. Is done. At this time, heat is recovered from the exhaust gas to a temperature (for example, 110 ° C.) lower than the temperature of the rare absorbent in the exhaust gas regenerator 1. The exhaust gas supplied to the second exhaust gas heat exchanger 12 is used as a heat source for preheating the rare absorbent supplied from the absorber 8 to the low temperature regenerator 4, and the dew point temperature of the exhaust gas (for example, 70 to 80 ° C.). ) Is recovered to a slightly higher temperature (for example, about 90 to 120 ° C.) and is discharged from the second exhaust gas heat exchanger 12 in the horizontal direction. In addition, the exhaust gas of the cogeneration apparatus 2 shall be discharged | emitted at about 110 degreeC from the 2nd exhaust gas heat exchanger 12 by rated operation, and heat | fever is collect | recovered to about 90 degreeC at maximum.

  Further, since the exhaust gas of the cogeneration apparatus 2 discharged from the second exhaust gas heat exchanger 12 is slightly higher than the dew point temperature, dew condensation may occur in the exhaust pipe 3. In such a case, as shown in FIG. 2, the exhaust pipe 3 of the cogeneration apparatus 2 extends horizontally from the second exhaust gas heat exchanger 12, so that the exhaust gas of the cogeneration apparatus 2 is condensed inside the exhaust pipe 3. Even so, the condensate does not flow backward to the second exhaust gas heat exchanger 12 side. The exhaust gas condensate collected near the outlet of the second exhaust gas heat exchanger 12 is extracted from the drain valve 3 a provided in the exhaust pipe 3. Therefore, even if this absorption chiller / heater discharges the exhaust gas of the cogeneration apparatus 2 at a temperature slightly higher than the dew point temperature, the exhaust pipe 3 passed through the inside does not corrode and the durability does not deteriorate. That is, the present absorption chiller / heater can recover heat from the exhaust gas of the cogeneration apparatus 2 to a temperature slightly higher than the dew point temperature without reducing durability.

  The absorption liquid absorbs the refrigerant vapor by the absorber 8 to become a rare absorption liquid, and is supplied from the absorber 8 to the exhaust gas regenerator 1 and the low temperature regenerator 4 in parallel, and at the exhaust gas regenerator 1 and the low temperature regenerator 4. After being concentrated, they are merged and returned to the absorber 8. More specifically, the heat is supplied from the absorber 8 through the low-temperature heat exchanger 9 to the exhaust heat recovery heat exchanger 15 and the second exhaust gas heat exchanger 12 in parallel, and from the exhaust heat recovery heat exchanger 15 to the exhaust gas regenerator 1 and It is supplied to the low temperature regenerator 4 in parallel. The dilute absorption liquid that is divided from the exhaust heat recovery heat exchanger 15 to the exhaust gas regenerator 1 is further divided and supplied in parallel to the high-temperature heat exchanger 10 and the first exhaust gas heat exchanger 11, and these heat exchangers. After being preheated at 10 and 11, they are merged and supplied to the exhaust gas regenerator 1. On the other hand, the rare absorbent separated from the exhaust heat recovery heat exchanger 15 to the low temperature regenerator 4 side joins with the rare absorbent preliminarily heated by the second exhaust gas heat exchanger 12 and is supplied to the low temperature regenerator 4. The Further, the concentrated absorbent concentrated in the exhaust gas regenerator 1 is merged with the concentrated absorbent concentrated in the low temperature regenerator 4 via the high temperature regenerator 14, the high temperature heat exchanger 10 and the auxiliary evaporator 16, and is subjected to low temperature heat exchange. It returns to the absorber 8 via the vessel 9.

  The rare absorbent supplied from the absorber 8 to the low-temperature heat exchanger 9 is subjected to heat exchange with the concentrated absorbent returned to the absorber 8 from the exhaust gas regenerator 1 and the low-temperature regenerator 4 in the low-temperature heat exchanger 9 to lower the temperature. Preheating is performed to a temperature (for example, 70 ° C.) slightly lower than the temperature (for example, 90 ° C.) of the concentrated absorbent in the heat regenerator 4.

  The rare absorption liquid supplied from the low-temperature heat exchanger 9 to the exhaust heat recovery heat exchanger 15 is preheated by heat exchange with the jacket cooling water of the cogeneration apparatus 2, and the concentrated absorption liquid in the low-temperature heat regenerator 4 is preliminarily heated. Approaching temperature. The rare absorption liquid preheated by the exhaust heat recovery heat exchanger 15 is sufficiently lower than the temperature of the absorption liquid in the exhaust gas regenerator 1 (for example, 150 to 160 ° C.). Heat exchange with the concentrated absorbent that is supplied in parallel to the hot heat exchanger 10 and the first exhaust gas heat exchanger 11 and discharged from the high temperature regenerator 14 and the exhaust gas of the cogeneration apparatus 2 that is discharged from the exhaust gas regenerator 1. Thus, preheating is performed to a temperature slightly lower than the absorbing liquid in the exhaust gas regenerator 1 (for example, about 130 ° C.). The rare absorbent that has joined from the high-temperature heat exchanger 10 and the first exhaust gas heat exchanger 11 and supplied to the exhaust gas regenerator 1 is heated by the exhaust gas of the cogeneration device 2, evaporates and separates the refrigerant, and the concentrated absorbent. It becomes. The concentrated absorbent supplied from the exhaust gas regenerator 1 to the high temperature regenerator 14 is reheated by the gas burner 17 of the high temperature regenerator 14, and further concentrated by evaporating and separating the refrigerant.

  On the other hand, the rare absorbent supplied from the low-temperature heat exchanger 9 to the second exhaust gas heat exchanger 12 is preheated by heat exchange with the exhaust gas of the cogeneration apparatus 2, and the concentrated absorbent in the low-temperature heat regenerator 4. Approaches the temperature. The exhaust gas of the cogeneration apparatus 2 supplied to the second exhaust gas heat exchanger 12 is higher than the temperature (for example, 90 ° C.) of the jacket cooling water of the cogeneration apparatus 2 supplied to the exhaust heat recovery heat exchanger 15. is there. For this reason, the rare absorption liquid pre-heated by the second exhaust gas heat exchanger 12 is about several degrees Celsius higher than the rare absorption liquid pre-heated by the exhaust heat recovery heat exchanger 15. In this way, when the temperature difference between the rare absorbents preheated by the second exhaust gas heat exchanger 12 and the exhaust heat recovery heat exchanger 15 is small, the rare absorbent liquid preheated by the second exhaust gas heat exchanger 12 is used. Is combined with a rare absorbent separated from the exhaust heat recovery heat exchanger 15 to the exhaust gas regenerator 1, the temperature is only sufficiently lower than the absorption liquid in the exhaust gas regenerator 1. When the rare absorbent that has been split from the exchanger 15 to the low temperature regenerator 4 side is joined, the temperature in the low temperature regenerator 4 can be reduced slightly below the temperature of the rare absorbent preheated by the second exhaust gas heat exchanger 12. The temperature is slightly lower than the absorbing liquid (for example, about 80 ° C.). Therefore, the preheating of the rare absorbent supplied to the low temperature regenerator 4 can be performed efficiently. The rare absorbing liquid supplied from the exhaust heat recovery heat exchanger 15 and the second exhaust gas heat exchanger 12 to the low temperature regenerator 4 is heated using the refrigerant vapor evaporated in the exhaust gas regenerator 1 and the high temperature regenerator 14 as a heat source. The refrigerant is concentrated by evaporation.

  Further, the concentrated absorbent concentrated in the exhaust gas regenerator 1 and the high temperature regenerator 14 passes through the high temperature regenerator 14 through the high temperature heat exchanger 10 and the auxiliary evaporator 16 and is about the same as the absorbent in the low temperature regenerator 4. The temperature drops to a temperature and merges with the concentrated absorbent concentrated in the low temperature regenerator 4. The concentrated absorbent after the merge is recovered through the low-temperature heat exchanger 9 and returned to the absorber 8. The concentrated absorbent returned to the absorber 8 absorbs the refrigerant vapor used for cooling the cold water in the evaporator 7 and becomes a rare absorbent.

  The refrigerant is absorbed by the absorption liquid in the absorber 8, and is evaporated and separated from the absorption liquid in the exhaust gas regenerator 1, the high temperature regenerator 14, the auxiliary evaporator 16, and the low temperature regenerator 4. The refrigerant vapor evaporated and separated in the exhaust gas regenerator 1 is supplied to the high temperature regenerator 14, and together with the refrigerant vapor evaporated and separated in the high temperature regenerator 14, the high temperature regenerator 14 passes through the inside of the low temperature regenerator 4 to the condenser 5. It is supplied to the condenser 5 through the connected pipe and condensed. The refrigerant vapor evaporated and separated by the auxiliary evaporator 16 is supplied to the low temperature regenerator 4 and is supplied to the condenser 5 together with the refrigerant vapor evaporated and separated by the low temperature regenerator 4 to condense.

  As described above, the absorption chiller / heater of the present invention supplies the exhaust gas of the cogeneration system 2 from the exhaust gas regenerator 1 in the order of the first and second exhaust gas heat exchangers 11 and 12, and the first exhaust gas heat. The pre-heating of the rare absorbent supplied from the absorber 8 to the exhaust gas regenerator 1 by the exchanger 11 and the rare absorbent supplied from the absorber 8 to the low temperature regenerator 4 by the second exhaust gas heat exchanger 12 are performed. It is designed to be used for preheating. Since the exhaust gas regenerator 1 concentrates the rare absorbent at a high temperature, the rare absorbent pre-heated to a temperature slightly lower than the absorbent in the exhaust gas regenerator 1 is supplied by the first exhaust gas heat exchanger 11. The On the other hand, since the low temperature regenerator 4 concentrates the rare absorption liquid at a low temperature, the rare absorption liquid preheated to a temperature slightly lower than the absorption liquid in the low temperature regenerator 4 by the second exhaust gas heat exchanger 12 is obtained. Supplied. Thereby, heat can be recovered from the exhaust gas of the cogeneration apparatus 2 to a temperature slightly higher than the dew point temperature (about 90 to 120 ° C.), and the heat can be used efficiently.

  Next, a modification of the present invention will be described with reference to FIG. The absorption chiller / heater of FIG. 3 joins the rare absorption liquid preheated in the exhaust heat recovery heat exchanger 15 and the second exhaust gas heat exchanger 12 at the outlet of the exhaust heat recovery heat exchanger 15. 1 is different from the absorption chiller / heater in FIG. 1 in that it is divided into the exhaust gas regenerator 1 side and the low temperature regenerator 4 side. About another point, since it is the same structure as the absorption-type cold / hot water machine of FIG. 1, detailed description is abbreviate | omitted.

  This absorption chiller / heater has a temperature difference (for example, 10 to 20) between the rare absorbent preheated by the second exhaust gas heat exchanger 12 and the rare absorbent preheated by the exhaust heat recovery heat exchanger 15. (Approx. Degree C) is suitable. In such a case, as in the absorption chiller / heater of FIG. 1, the rare absorption liquid preliminarily heated by the second exhaust gas heat exchanger 12 is diluted into the rare absorption liquid divided from the exhaust heat recovery heat exchanger 15 to the low temperature regenerator 4 side. When the liquids are merged, the temperature difference from the rare absorbent that has been diverted from the exhaust heat recovery heat exchanger 15 to the exhaust gas regenerator 1 increases. Therefore, in the absorption chiller / heater of FIG. 3, the rare absorption liquid preheated by the second exhaust gas heat exchanger 12 and the exhaust heat recovery heat exchanger 15 is merged at the outlet of the exhaust heat recovery heat exchanger 15. The dilute absorbent at the same temperature is distributed to the exhaust gas regenerator 1 side and the low temperature regenerator 4 side to suppress overheating of the rare absorbent supplied to the low temperature regenerator 4 while exhaust heat recovery heat exchange. The temperature of the rare absorbing liquid that is diverted from the gas generator 15 to the exhaust gas regenerator 1 can also be increased, and the exhaust gas of the cogeneration apparatus 2 can be used efficiently.

  Further, in the absorption chiller / heater of FIG. 3, the rare absorption liquid having a temperature higher than that of the absorption chiller heater of FIG. 1 is supplied to the high-temperature heat exchanger 10 and the first exhaust gas heat exchanger 11. The amount of heat required for preheating the rare absorbent in the high-temperature heat exchanger 10 and the first exhaust gas heat exchanger 11 is suppressed. Thereby, the high-temperature concentrated absorbent and the exhaust gas of the cogeneration apparatus 2 are discharged from the high-temperature heat exchanger 10 and the first exhaust gas heat exchanger 11 than the absorption chiller / heater of FIG. When the temperature of the concentrated absorbent discharged from the high-temperature heat exchanger 10 increases, the concentration of the concentrated absorbent in the auxiliary evaporator 16 can be promoted, and the cogeneration apparatus discharged from the first exhaust gas heat exchanger 11 When the temperature of the exhaust gas 2 becomes high, the rare absorbent can be preheated to a higher temperature in the second exhaust gas heat exchanger 12.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the low-temperature heat exchanger 9 and the high-temperature heat exchange shown in the above-described embodiments Any one of the unit 10, the high temperature regenerator 14, the exhaust heat recovery heat exchanger 15, and the auxiliary evaporator 16 may be omitted.

It is a flowchart which illustrates the absorption-type cold / hot water machine of this invention. It is a principal part enlarged side view which illustrates the absorption cold / hot water machine of this invention. It is a flowchart which shows the modification of this invention. It is a flowchart which illustrates the dual effect absorption type cold / hot water of the conventional parallel flow system. (A) is a plan view illustrating a conventional absorption chiller / heater, and (B) is a side view of the same.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust gas regenerator 2 Cogeneration apparatus 3 Exhaust pipe 4 Low temperature regenerator 5 Condenser 6a 1st heat exchanger tube 6b 2nd heat exchanger tube 7 Evaporator 8 Absorber 11 1st exhaust gas heat exchanger 12 2nd exhaust gas heat Exchanger 15 Waste heat recovery heat exchanger

Claims (6)

An exhaust gas regenerator that concentrates the rare absorbent using the exhaust gas of the cogeneration apparatus as a heat source, a low temperature regenerator that concentrates the rare absorbent using the refrigerant vapor evaporated and separated from the rare absorbent in the exhaust gas regenerator as a heat source, and A condenser for condensing and liquefying refrigerant vapor used as a heat source for a low-temperature regenerator and refrigerant vapor evaporated and separated from a rare absorbent in the low-temperature regenerator, and an evaporator for evaporating the refrigerant liquid condensed and liquefied in the condenser under vacuum And an absorber that absorbs the refrigerant vapor evaporated in the evaporator into the concentrated absorbent concentrated in the exhaust gas regenerator and the low-temperature regenerator to generate a rare absorbent, and removes the rare absorbent from the absorber. A parallel flow type system that supplies the exhaust gas regenerator and the low temperature regenerator in parallel, and combines the concentrated absorbents concentrated in the exhaust gas regenerator and the low temperature regenerator to return them to the absorber. In effect absorption chiller,
The first and second exhaust gas heat exchangers that preheat the diluted absorbent diluted with the absorber using the exhaust gas of the cogeneration device used in the exhaust gas regenerator as a heat source are discharged from the cogeneration device. The exhaust pipe is arranged in order of the first and second exhaust gas heat exchangers in series with the exhaust gas regenerator, and the rare absorption liquid preheated by the first exhaust gas heat exchanger is supplied to the exhaust gas regenerator, and Supplying the rare absorbent preheated in the second exhaust gas heat exchanger to the low temperature regenerator ,
A waste heat recovery heat exchanger for exchanging heat between the cooling water of the cogeneration apparatus and the diluted absorbent diluted in the absorber; and the diluted absorbent diluted in the absorber is recovered in the exhaust heat recovery Supplyed in parallel to the heat exchanger and the second exhaust gas heat exchanger, and combined with the rare absorbent preheated in the exhaust heat recovery heat exchanger and the second exhaust gas heat exchanger and supplied to the low temperature regenerator absorption chiller-heater was so.   A high-temperature heat exchanger for exchanging heat between the diluted absorbent diluted in the absorber and supplied to the exhaust gas regenerator and the concentrated absorbent supplied in the exhaust gas regenerator and supplied to the absorber; The diluted rare absorption liquid is supplied in parallel to the high temperature heat exchanger and the first exhaust gas heat exchanger, and the rare absorption liquid preheated by the high temperature heat exchanger and the first exhaust gas heat exchanger is joined. The absorption chiller / heater according to claim 1, wherein the absorption chiller is supplied to an exhaust gas regenerator. The rare absorption liquid preheated in the exhaust heat recovery heat exchanger is supplied in parallel to the exhaust gas regenerator and the low temperature regenerator, and the rare absorption liquid supplied from the exhaust heat recovery heat exchanger to the low temperature regenerator is added to the rare absorption liquid. The absorption chiller-heater according to claim 1 , wherein the rare absorbent preheated by the exhaust gas heat exchanger of No. 2 is merged. The absorption according to claim 1 , wherein the rare absorbent preheated by the exhaust heat recovery heat exchanger and the second exhaust gas heat exchanger is joined and supplied in parallel to the exhaust gas regenerator and the low temperature regenerator. Type hot and cold water machine. Wherein the first and with the exhaust pipe before Symbol cogeneration system built in an L-shape in the exhaust gas regenerator and the first and second exhaust gas heat exchanger, the exhaust gas of the cogeneration system is supplied from above the exhaust regenerator The absorption chiller / heater according to claim 1, wherein the chilled water heater is discharged from the second exhaust gas heat exchanger in a horizontal direction. The absorption chiller-heater according to claim 5 , wherein a drain valve for discharging the condensate of the exhaust gas is provided at an outlet portion extending in a horizontal direction from the second exhaust gas heat exchanger of the exhaust pipe of the cogeneration apparatus.