JP3948814B2 - Multi-effect absorption refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorption refrigerator, and more particularly, to a multi-effect absorption refrigerator that uses refrigerant vapor generated in a high-temperature regenerator as a heating source in the low-temperature regenerator.
[0002]
[Prior art]
FIG. 2 shows an example of a conventional multi-effect absorption refrigerator (triple effect example). As shown in FIG. 2, the high temperature side regenerator 1 and the low temperature side regenerators 2 and 3 (medium temperature regenerator and low temperature regenerator). ), The solution concentrations of the dilute solutions La, Lb, and Lc supplied to the regenerators 1 to 3 are equal to each other when the dilute solution La, Lb, and Lc are sent in parallel.
[0003]
In the figure, 4 is a heater, 5 is a condenser, 6 is an evaporator, 8 is an absorber, P1 is a solution pump, P3 is a refrigerant pump, C is a heat medium to be cooled, W is a heat medium for cooling, N Are solution heat exchangers, respectively.
[0004]
In addition, as shown in FIG. 3 , for the generation of the diluted solution, first and second evaporators 6A and 6B for sequentially evaporating the refrigerant R ′ condensed by the condenser are provided, and the return concentrated solution from the regenerator is provided. L ′ is provided with first and second absorbers 8A and 8B that sequentially absorb the refrigerant vapor generated in the first and second evaporators 6A and 6B. In this configuration, the heat medium C to be cooled is second evaporated. The first absorption is achieved by passing the evaporator 6B through the first evaporator 6A in order, and setting the refrigerant evaporation temperature in the second evaporator 6B higher than the refrigerant evaporation temperature required in the first evaporator 6A. A two-stage absorption method is known in which refrigerant is absorbed to a lower solution concentration in the second absorber 8B as compared with refrigerant absorption in the vessel 8A.
[0005]
That is, according to this two-stage absorption method, the solution concentration of the dilute solution L to be sent to the regenerator after the refrigerant absorption can be lowered as compared with the normal one-stage absorption method, whereby the solution concentration in the regenerator can be reduced. Can be increased (that is, the increase range of the solution concentration in the solution concentration regeneration due to the generation of the refrigerant vapor) to increase the generation efficiency of the refrigerant vapor in the regenerator.
[0006]
[Problems to be solved by the invention]
However, as described above, when dilute solutions having the same solution concentration are supplied in parallel to each regenerator in the multi-effect type, the solution concentration of the dilute solution supplied to each regenerator is assumed by adopting a two-stage absorption method. Even if the efficiency of refrigerant vapor generation in each regenerator is improved by reducing the efficiency, there is a limit to the improvement of the overall apparatus efficiency (coefficient of performance), and there is still room for improvement.
[0007]
In contrast to this situation, the main problem of the present invention is to effectively improve the overall efficiency of the multi-effect absorption refrigerator by rational improvement in terms of solution circulation.
[0008]
[Means for Solving the Problems]
[1] In the invention according to claim 1, in the solution circulation in which the dilute solution is sent in parallel from the separate absorbers to the high temperature side regenerator and the low temperature side regenerator, the high temperature side dilute solution sent to the high temperature side regenerator The solution concentration of the low temperature side dilute solution sent to the low temperature side regenerator is made lower than the solution concentration of the low temperature side regenerator. Also, the high temperature side concentrated solution sent from the high temperature side regenerator and the low temperature side concentrated solution sent from the low temperature side regenerator are merged, and the merged concentrated solution is absorbed by the refrigerant in the first absorber, And the low temperature side dilute solution which sends the dilute solution produced | generated by the 1st absorber to a low temperature side regenerator, and the high temperature side dilute solution which sends a refrigerant | coolant further to a high temperature side regenerator after further absorbing a refrigerant | coolant with a 2nd absorber. Divide into
[0009]
That is, in the multi-effect mode, the refrigerant vapor generated in the high temperature side regenerator is used as a heating source for generating refrigerant vapor in the low temperature side regenerator. Is lower than the solution concentration of the low temperature side dilute solution that is sent to the low temperature side regenerator, and the change width of the solution concentration in the high temperature side regenerator is larger than the change concentration of the solution concentration in the low temperature side regenerator (that is, If the amount of refrigerant vapor generated in the high-temperature side regenerator is increased without increasing the heating amount in the high-temperature side regenerator), the heating amount in the low-temperature side regenerator increases accordingly. The amount of refrigerant vapor generated in the regenerator also increases, thereby effectively improving the overall efficiency (coefficient of performance) of the apparatus.
[0010]
In the invention described in claim 1, among the dilute solutions sent in parallel from the different absorbers to the high temperature side regenerator and the low temperature side regenerator, the solution of the high temperature side dilute solution sent to the high temperature side regenerator Since only the concentration is selectively lowered, for example, even if the two-stage absorption method is adopted, the amount of the solution whose concentration is to be reduced is smaller than the case where the solution concentration of the dilute solution supplied to each regenerator is reduced as described above. The amount of the high-temperature dilute solution sent to the high-temperature side regenerator can be reduced more effectively by that amount, and the change range of the solution concentration in the high-temperature side regenerator can be reduced to the low-concentration side. It can be expanded more effectively.
[0011]
That is, according to the first aspect of the present invention, as described above, the variation range of the solution concentration in the high temperature side regenerator can be more effectively expanded to the low concentration side, and the amount of refrigerant vapor generated in the high temperature side regenerator can be effectively increased. And the accompanying increase in the amount of refrigerant vapor generated in the low-temperature side regenerator as described above can be effectively increased, and the concentration of the diluted solution supplied to each regenerator is simply averaged. The overall efficiency of the device can be improved extremely effectively compared to the reduction in the temperature, and the required efficiency can be improved by effectively expanding the variation range of the solution concentration in the high temperature side regenerator. The running cost can be greatly reduced by reducing the amount of heating required to obtain the refrigerating capacity and the power consumption of the solution pump.
Further, in the case of the dilute solution generation form as described above, the solution whose concentration is reduced to the same concentration as that of the low temperature side dilute solution in the first absorber is further absorbed by the refrigerant in the second absorber so that the low concentration high temperature side dilute solution is obtained. (So-called two-stage absorption method), the amount of solution whose concentration is to be decreased is small compared to the case where a low-temperature high-temperature dilute solution is generated all at once by only one-stage refrigerant absorption with respect to the concentrated solution sent from the regenerator. In combination with this, it becomes easy to efficiently and reliably lower the solution concentration of the high-temperature dilute solution to be generated, and thereby the effect of the above-described invention can be obtained more reliably and stably.
Further, in this dilute solution generation form, a low-concentration high-temperature dilute solution is used in a two-stage absorption method while the first absorber that generates the low-temperature dilute solution is also used as a pre-stage absorber in the two-stage absorption method. For example, the low temperature side concentrated solution sent from the low temperature side regenerator and the high temperature side concentrated solution sent from the high temperature side regenerator are separated from the absorber for the low temperature side dilute solution and a high temperature different from this. Compared to the two-stage absorption type absorber for the side dilute solution, where the refrigerant is absorbed separately, the configuration of the absorber part as a whole device can be simplified and the device can be manufactured easily. it can.
[0012]
[2] In the invention according to claim 2, in the solution circulation in which the dilute solution is sent in parallel from each of the different absorbers to the high temperature side regenerator and the low temperature side regenerator, the high temperature side dilute solution sent to the high temperature side regenerator The solution concentration of the high temperature side concentrated solution sent from the high temperature side regenerator is sent from the low temperature side regenerator. Lower the solution concentration of the low temperature side concentrated solution, and merge the high temperature side concentrated solution sent from the high temperature side regenerator with the low temperature side concentrated solution sent from the low temperature side regenerator, and The refrigerant is absorbed in the first absorber, and the diluted solution generated in the first absorber is sent to the low-temperature side regenerator, and the refrigerant is further absorbed in the second absorber, and then the high-temperature side Divide into hot dilute solution sent to regenerator.
[0013]
In other words, in this way, while the refrigerant vapor generation amount in the high temperature side regenerator is kept large by the increase of the refrigerant vapor generation amount by lowering the solution concentration of the supplied dilute solution, the delivery from the high temperature side regenerator is maintained. In the form in which the pressure of the generated refrigerant vapor is kept high against the decrease in the regeneration temperature due to the decrease in the solution concentration of the concentrated solution (that is, the decrease in the final regeneration concentration in the solution concentration regeneration in the high temperature side regenerator) The regeneration temperature in the high temperature side regenerator required to secure the regeneration temperature can be reduced, and the overall efficiency of the apparatus can be improved by the decrease in the necessary regeneration temperature.
[0014]
As in the first aspect of the invention, of the dilute solutions sent in parallel from the different absorbers to the high temperature side regenerator and the low temperature side regenerator, the high temperature side dilute solution sent to the high temperature side regenerator Since only the solution concentration is selectively lowered, the amount of the solution whose concentration is to be reduced is smaller than when the solution concentration of the dilute solution supplied to each regenerator is reduced. It becomes possible to reduce the solution concentration of the dilute solution more effectively, further reducing the regeneration temperature in the high temperature side regenerator due to the decrease in the solution concentration on the sending side while maintaining the amount of refrigerant vapor generated as described above. Therefore, the overall efficiency of the apparatus can be improved effectively, and the required refrigeration can be improved by reducing the required regeneration temperature in the high-temperature side regenerator. Reduces the amount of heat required to gain capacity Running costs Te can be greatly reduced.
Further, in the case of the dilute solution generation form as described above, the solution whose concentration is reduced to the same concentration as that of the low temperature side dilute solution in the first absorber is further absorbed by the refrigerant in the second absorber so that the low concentration high temperature side dilute solution is obtained. (So-called two-stage absorption method), the amount of solution whose concentration is to be decreased is small compared to the case where a low-temperature high-temperature dilute solution is generated all at once by only one-stage refrigerant absorption with respect to the concentrated solution sent from the regenerator. In combination with this, it becomes easy to efficiently and reliably lower the solution concentration of the high-temperature dilute solution to be generated, and thereby the effect of the above-described invention can be obtained more reliably and stably.
Further, in this dilute solution generation form, a low-concentration high-temperature dilute solution is used in a two-stage absorption method while the first absorber that generates the low-temperature dilute solution is also used as a pre-stage absorber in the two-stage absorption method. For example, the low temperature side concentrated solution sent from the low temperature side regenerator and the high temperature side concentrated solution sent from the high temperature side regenerator are separated from the absorber for the low temperature side dilute solution and a high temperature different from this. Compared to the two-stage absorption type absorber for the side dilute solution, where the refrigerant is absorbed separately, the configuration of the absorber part as a whole device can be simplified and the device can be manufactured easily. it can.
[0015]
In the multi-effect type, in order to secure the regeneration temperature in the low temperature side regenerator, the regeneration temperature in the high temperature side regenerator is much higher than the regeneration temperature (generally 90 to 100 ° C.) in the case of single effect. However, according to the second aspect of the present invention, the high temperature side regenerator has a problem that it is difficult to prevent corrosion due to the high temperature. By effectively reducing the regeneration temperature in the apparatus, the problem of device corrosion due to high temperatures can be effectively avoided.
[0016]
Incidentally, in the case of triple effect, the regeneration temperature in the high temperature side regenerator becomes 200 ° C. or more as described above, but generally the corrosiveness to the iron or the like of the lithium bromide solution used for the absorbing solution suddenly exceeds 200 ° C. Since it increases, the ability to lower the regeneration temperature required for the high temperature side regenerator as described above is extremely effective in preventing device corrosion.
[0017]
[3] In the invention according to claim 3, the solution concentration of the high temperature side dilute solution sent to the high temperature side regenerator is made lower than the solution concentration of the low temperature side dilute solution sent to the low temperature side regenerator, The change range of the solution concentration is larger than the change range of the solution concentration at the low temperature side regenerator, and the solution concentration of the high temperature side concentrated solution sent from the high temperature side regenerator is changed to the low temperature value sent from the low temperature side regenerator. The concentration of the concentrated solution is lower than the concentration of the side concentrated solution, and the high temperature side concentrated solution delivered from the high temperature side regenerator and the low temperature side concentrated solution delivered from the low temperature side regenerator are merged, and the combined concentrated solution is Refrigerant is absorbed in one absorber, and the diluted solution produced in the first absorber is supplied to the low-temperature side regenerator, and the refrigerant is further absorbed in the second absorber and then regenerated on the high-temperature side. Divide into hot dilute solution to be sent to the vessel.
[0018]
That is, of the dilute solutions sent in parallel from different absorbers to the high temperature side regenerator and the low temperature side regenerator, the solution concentration of the high temperature side dilute solution sent to the high temperature side regenerator may be selectively lowered. For example, the amount of the solution whose concentration is to be reduced becomes small, and by effectively utilizing the fact that the solution concentration of the high temperature side dilute solution sent to the high temperature side regenerator can be effectively reduced, Both the expansion of the change range of the solution concentration and the reduction of the regeneration temperature in the high temperature side regenerator by lowering the concentration of the concentrated solution sent from the high temperature side regenerator are performed. Thus, both the effect of the invention of claim 1 and the effect of the invention of claim 2 can be obtained.
Further, in the case of the dilute solution generation form as described above, the solution whose concentration is reduced to the same concentration as that of the low temperature side dilute solution in the first absorber is further absorbed by the refrigerant in the second absorber so that the low concentration high temperature side dilute solution is obtained. (So-called two-stage absorption method), the amount of solution whose concentration is to be decreased is small compared to the case where a low-temperature high-temperature dilute solution is generated all at once by only one-stage refrigerant absorption with respect to the concentrated solution sent from the regenerator. In combination with this, it becomes easy to efficiently and surely reduce the solution concentration of the high-temperature side dilute solution to be generated, and thereby the effect of the invention of claim 1 and the invention of claim 2 are achieved. Both of the effects can be obtained more reliably and stably.
Further, in this dilute solution generation form, a low-concentration high-temperature dilute solution is used in a two-stage absorption method while the first absorber that generates the low-temperature dilute solution is also used as a pre-stage absorber in the two-stage absorption method. For example, the low temperature side concentrated solution sent from the low temperature side regenerator and the high temperature side concentrated solution sent from the high temperature side regenerator are separated from the absorber for the low temperature side dilute solution and a high temperature different from this. Compared to the two-stage absorption type absorber for the side dilute solution, where the refrigerant is absorbed separately, the configuration of the absorber part as a whole device can be simplified and the device can be manufactured easily. it can.
[0022]
[4] In the invention according to claim 4 , the first refrigerant that absorbs the generated refrigerant vapor in the first absorber that generates the low-temperature side diluted solution, and the generated refrigerant vapor in the second absorber that generates the high-temperature side diluted solution. And a second evaporator that absorbs the cooling medium, and the cooling target heat medium is sequentially cooled from the second evaporator to the first evaporator. By sequential cooling (in other words, two-stage cooling), the refrigerant evaporation temperature in the second evaporator is made higher than the refrigerant evaporation temperature in the first evaporator, so that the high-temperature side dilute solution generated in the second absorber The solution concentration can be made lower than the solution concentration of the low-temperature dilute solution generated by the first absorber.
[0023]
As described above, the solution concentration of the high-temperature side dilute solution among the dilute solutions supplied in parallel to the regenerators is selectively reduced, and the amount of solution to be reduced in concentration is small. As described above, it is possible to effectively contribute the temperature and heat quantity of the refrigerant to be cooled that is still high before cooling, while increasing the refrigerant evaporation temperature and lowering the solution concentration of the diluted solution generated in the second absorber. Accordingly, it is possible to effectively reduce the solution concentration of the high-temperature side dilute solution, and to obtain the effect of the invention according to claim 1 or 2 more reliably and stably.
[0025]
[5] In the invention according to claim 5 , in the apparatus configuration in which the intermediate temperature regenerator and the low temperature regenerator are provided as the low temperature side regenerator, the generated refrigerant vapor in the high temperature side regenerator is used as the heating source of the intermediate temperature regenerator, Since the refrigerant vapor generated in the intermediate temperature regenerator or the condensate refrigerant after being used as a heating source in the intermediate temperature regenerator is used as a heating source for the low temperature regenerator (ie, at least a triple effect type). The improvement in the overall efficiency due to the increase in the number of stages of the multi-effect type in which the refrigerant vapor generated in the high temperature side regenerator is used as the heating source in the low temperature side regenerator, and the improvement in the overall efficiency according to the invention of claim 1 or 2 are combined. In addition, the absorption chiller with extremely high overall efficiency can be obtained.
[0026]
In such a multi-effect format, the higher the number of stages, the higher the required regeneration temperature in the high temperature side regenerator (the uppermost regenerator). The ratio of the amount of heat that effectively contributes to the generation of refrigerant vapor in the high-temperature side regenerator of the amount of heating by the heater decreases due to the expansion of the temperature difference from the dilute solution supply temperature (that is, the efficiency of refrigerant vapor generation in the high-temperature side regenerator) The invention according to claim 1 or 2 improves the efficiency of the apparatus and prevents the corrosion of the apparatus. Above, it becomes more effective as the number of stages of the multiple utility format increases.
[0027]
In the case of a multi-effect type of quadruple effect or more, as a high temperature side regenerator for the low temperature regenerator and the medium temperature regenerator, a plurality of multiple utility relationships between the high temperature side regenerator and the low temperature side regenerator are provided. The apparatus configuration in which the regenerator is provided is adopted.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an integrated triple effect absorption refrigerator that combines a solution circulation system into one. 1 is a high-temperature regenerator, 2 is a medium-temperature regenerator, and 3 is a low-temperature regenerator. The refrigerant vapor Ra generated from the solution La in the high-temperature regenerator 1 is sent to the heating heat exchanger 2a of the medium-temperature regenerator 2, and the refrigerant vapor Rb from the solution Lb in the medium-temperature regenerator 2 is used as a heating source. Is generated.
[0029]
Further, the high-temperature condensate refrigerant Ra ′ sent from the heating heat exchanger 2 a of the intermediate temperature regenerator 2 and the refrigerant vapor Rb generated in the intermediate temperature regenerator 2 are supplied to the heating heat exchangers 3 a and 3 b of the low temperature regenerator 3. The refrigerant vapor Rc is generated from the solution Lc in the low-temperature regenerator 3 using the high-temperature liquid refrigerant Ra ′ and the refrigerant vapor Rb as heating sources.
[0030]
2g and 3g, when a combustion device such as a gas burner is used as the heater 4, the high-temperature combustion gas E generated by the combustion device is used as a heating source for generating refrigerant vapor in the high-temperature regenerator 1; It is a heat exchanger for heating to be effectively used as part of a heating source for generating refrigerant vapor in the intermediate temperature regenerator 2 and the low temperature regenerator 3.
[0031]
The condensate refrigerants Ra ′ and Rb ′ sent from the heat exchangers 3a and 3b for heating of the low-temperature regenerator 3 and the refrigerant vapor Rc generated in the low-temperature regenerator 3 are combined in the condenser 5 to cool the uncondensed components. The refrigerant is condensed by cooling by the heat exchanger 5a, and the liquid refrigerant is sent from the condenser 5 to the first and second evaporators 6 and 7 by being divided into two streams Rx ′ and Ry ′, and these liquid refrigerants Rx ′, Ry ′ is evaporated in each of the evaporators 6 and 7 by taking heat of vaporization from the heat medium C to be cooled (circulated cold water in this example).
[0032]
6a and 7a are evaporation heat exchangers (that is, heat exchangers for generating cold water) for exchanging heat between the refrigerants Rx ′ and Ry ′ in the evaporation process and the heat medium C to be cooled in the evaporators 6 and 7, The cooling target heat medium C is passed through the evaporating heat exchanger 7a of the second evaporator 7 and the evaporating heat exchanger 6a of the first evaporator 6 in this order, so that the evaporating heat exchanger of the second evaporator 7 is passed. 7a, the temperature is decreased from t1 to t2, and subsequently the temperature is decreased from t2 to t3 in the evaporating heat exchanger 6a of the first evaporator 6. From this two-stage cooling, the refrigerant Ry in the second evaporator 7 is decreased. The evaporation temperature tb of 'is made higher than the evaporation temperature ta of the refrigerant Rx' in the first evaporator 6.
[0033]
On the other hand, the concentrated solutions La ′, Lb ′, and Lc ′ after generation of refrigerant vapor (that is, after concentration) delivered from the regenerators 1, 2, and 3 are merged and sent to the first absorber 8 for the first absorption. In the evaporator 8, the refrigerant vapor Rx generated in the first evaporator 6 is absorbed by the combined concentrated solution L ′. And the dilute solution L produced | generated by refrigerant | coolant absorption with the 1st absorber 8 is shunted into two stream L1, L2, and one side L1 is further shunted into two stream Lb, Lc as a low temperature side dilute solution, It distributes and supplies to the low temperature regenerator 3, while the L 2 is sent to the second absorber 9.
[0034]
In the second absorber 9, as described above, the rare refrigerant supplied from the first absorber 8 under the condition that the refrigerant evaporation temperature tb in the second evaporator 7 is higher than the refrigerant evaporation temperature ta in the first evaporator 6. The solution L2 further absorbs the refrigerant vapor Ry generated in the second evaporator 7, and thereby the solution concentration d2 is lower than the solution concentration d1 of the low temperature side dilute solutions Lb and Lc sent to the intermediate / low temperature regenerators 2 and 3. A dilute solution La is generated, and the low concentration dilute solution La is supplied to the high temperature regenerator 1 as a high temperature side dilute solution.
[0035]
In the triple effect absorption refrigerating machine of the first embodiment, the solution concentration d2 of the high temperature side dilute solution La sent to the high temperature regenerator 1 (high temperature side regenerator) is changed to the medium temperature / low temperature regenerators 2, 3 as described above. By making it lower than the solution concentration d1 of the low-temperature dilute solutions Lb and Lc sent to the (low-temperature regenerator), the change width Δd2 of the solution concentration in the high-temperature regenerator 1 can be reduced. The solution concentration d2 ′ (= d2 + Δd2) of the high temperature side concentrated solution La ′ sent from the high temperature regenerator 1 is set larger than the change width Δd1 of the solution concentration (Δd2> Δd1), or the medium temperature / low temperature regenerator 2, 3 is set to be lower (d2 ′ <d1 ′) than the solution concentration d1 ′ (= d1 + Δd1) of the low-temperature side concentrated solutions Lb ′ and Lc ′ delivered from 3.
[0036]
In addition, as an example of a specific operation value, in a form in which water is used as the refrigerant and a lithium bromide solution is used as the absorbing liquid, t1≈15 ° C., t2≈12 ° C., t3≈7 ° C., ta≈5 ° C., tb ≈10 ° C., d 1 ≈58% (solution temperature 40 ° C.), d 2 ≈55% (solution temperature 40 ° C.), and d 1 ′ = 63%, whereas when Δd 2> Δd 1, 60% <d 2 ′ ≦ 63%, and when d2 ′ <d1 ′, 58% ≦ d2 ′ <63%.
[0037]
W is a cooling heat medium (water in this example) supplied to the cooling heat exchanger 5a of the condenser 5 and the cooling heat exchangers 8a and 9a of the first and second absorbers 8 and 9, and P1 is a low-pressure solution. The pump P2 is a high-pressure solution pump for the high temperature side dilute solution, and P3 and P4 are refrigerant pumps for circulating and spraying the liquid refrigerants Rx ′ and Ry ′ in the first and second evaporators 6 and 7, respectively.
[0038]
Reference numerals 10 to 14 denote heat recovery first to fifth heat exchangers for heat exchange between the concentrated solution and the dilute solution. In the first heat exchanger 10, the concentrated solution La ′ sent from the high temperature regenerator 1 is heated to a high temperature. Heat exchange is performed with the dilute solution La supplied to the regenerator 1, and in the second heat exchanger 11, the concentrated concentrated solution La ′ from the first heat exchanger 10 and the concentrated concentrated solution Lb ′ from the intermediate temperature regenerator 2 are merged. The concentrated solution is heat exchanged with the dilute solution La supplied to the first heat exchanger 10, and the third heat exchanger 12 converts the combined concentrated solutions La ′ and Lb ′ sent from the second heat exchanger 11 into an intermediate temperature regenerator. Heat exchange with the feed dilute solution Lb to 2.
[0039]
Further, in the fourth heat exchanger 13, the combined concentrated solution of the combined concentrated solutions La ′ and Lb ′ delivered from the third heat exchanger 12 and the delivered concentrated solution Lc ′ from the low-temperature regenerator 3 is subjected to the second heat exchange. In the fifth heat exchanger 14, the combined concentrated solution L ′ delivered from the fourth heat exchanger 13 is supplied to the third diluted heat supply La to be supplied to the third heat exchanger 12. Heat exchange is performed with respect to the dilute solution L1 before being divided into the solution Lb and the dilute solution Lc supplied to the low temperature regenerator 3.
[0040]
That is, in this heat exchange configuration, the low temperature side rare solutions Lb ′ and Lc ′ sent from the intermediate temperature / low temperature regenerators 2 and 3 (low temperature side regenerator) are sent to the intermediate temperature / low temperature regenerators 2 and 3. Before exchanging heat with the solutions Lb and Lc in the third and fifth heat exchangers 12 and 14, the hot side dilute solution La and the second and fourth heat exchangers 11 to be sent to the high temperature regenerator 1 (high temperature side regenerator). , 13 is preferentially heat-exchanged, and thereafter, the high-temperature side diluted solution La is heat-exchanged with the high-temperature side concentrated solution La ′ delivered from the high-temperature regenerator 1 by the first heat exchanger 10, and By increasing the supply temperature of the dilute solution to the high-temperature regenerator 1 by this preferential heat exchange, the refrigerant vapor generation efficiency in the high-temperature regenerator 1 and, consequently, the overall efficiency (coefficient of performance) greatly affected by the influence are further improved. It is.
[0056]
[Other Embodiments]
In each of the above-described embodiments, a triple effect absorption refrigerator has been shown. However, in implementing the present invention, the number of multi-effect stages in which the generated refrigerant vapor in the high temperature side regenerator is used as a heating source in the low temperature side regenerator is shown. The present invention is not limited to the triple effect, but can be applied to a double effect or a multiple effect absorption refrigerator having a quadruple effect or more.
[0057]
When there are multiple low-temperature regenerators with triple effects or more, a form in which a dilute solution is supplied in parallel to these low-temperature regenerators, a form in which they are supplied in series, or a parallel supply and a series supply Any of the combined forms may be adopted.
[0058]
The combination of the refrigerant and the absorbing liquid is not limited to the combination of water and the lithium bromide solution. For example, various combinations such as a combination of ammonia as the refrigerant and water as the absorbing liquid are possible.
[0059]
The heater in the high temperature side regenerator may be either a combustion type using gas fuel or liquid fuel, or a type using high temperature steam or high temperature water as a heat source.
[0060]
The multi-effect absorption refrigerator according to the present invention is not limited to a dedicated refrigerator, but may be implemented as an absorption chiller / heater or an absorption heat pump.
[Brief description of the drawings]
FIG. 1 is a refrigeration circuit diagram showing an embodiment . FIG. 2 is a refrigeration circuit diagram showing a conventional example. FIG. 3 is a partial refrigeration circuit diagram showing another conventional example.
1 High temperature side regenerator Ra 'Refrigerant vapor 2,3 Low temperature side regenerator (medium temperature regenerator, low temperature regenerator)
8,28 Absorber (first absorber)
9,29 Absorber (second absorber)
L Dilute solution before diversion La High temperature side dilute solution Lb, Lc Low temperature side dilute solution La 'High temperature side concentrated solution Lb', Lc 'Low temperature side concentrated solution L' Combined concentrated solution d1, d2 Solution concentration d1 ', d2' Solution concentration Δd1, Δd2 Solution concentration change width 6,26 First evaporator 7, 27 Second evaporator C Cooling target heat medium

Claims (5)

A multi-effect absorption refrigerator that uses the refrigerant vapor generated in the high temperature side regenerator as a heating source in the low temperature side regenerator,
In the solution circulation in which a dilute solution is sent in parallel from different absorbers to the high temperature side regenerator and the low temperature side regenerator,
The solution concentration of the high temperature side dilute solution sent to the high temperature side regenerator is made lower than the solution concentration of the low temperature side dilute solution sent to the low temperature side regenerator, and the variation range of the solution concentration in the high temperature side regenerator is reduced to the low temperature side regenerator. Ri greater Citea than the change width of the solution concentration of the side regenerator,
The high temperature side concentrated solution delivered from the high temperature side regenerator and the low temperature side concentrated solution delivered from the low temperature side regenerator are merged, and the merged concentrated solution is absorbed by the refrigerant in the first absorber,
The dilute solution produced in the first absorber is sent to the low temperature side regenerator, and the high temperature side dilute solution is further absorbed in the second absorber and then sent to the high temperature side regenerator. A multi-effect absorption refrigerator that is divided into a solution . A multi-effect absorption refrigerator that uses the refrigerant vapor generated in the high temperature side regenerator as a heating source in the low temperature side regenerator,
In the solution circulation in which a dilute solution is sent in parallel from different absorbers to the high temperature side regenerator and the low temperature side regenerator,
A solution of a high temperature side concentrated solution sent from the high temperature side regenerator by lowering the solution concentration of the high temperature side dilute solution sent to the high temperature side regenerator to be lower than the solution concentration of the low temperature side dilute solution sent to the low temperature side regenerator. concentration, Citea Ri lower than the solution concentration of the low-temperature side concentrated solution to be delivered from the low temperature side regenerator,
The high temperature side concentrated solution delivered from the high temperature side regenerator and the low temperature side concentrated solution delivered from the low temperature side regenerator are merged, and the merged concentrated solution is absorbed by the refrigerant in the first absorber,
The dilute solution produced in the first absorber is sent to the low temperature side regenerator, and the high temperature side dilute solution is further absorbed in the second absorber and then sent to the high temperature side regenerator. A multi-effect absorption refrigerator that is divided into a solution . A multi-effect absorption refrigerator that uses the refrigerant vapor generated in the high temperature side regenerator as a heating source in the low temperature side regenerator,
In the solution circulation in which a dilute solution is sent in parallel from different absorbers to the high temperature side regenerator and the low temperature side regenerator,
The solution concentration of the high temperature side dilute solution sent to the high temperature side regenerator is made lower than the solution concentration of the low temperature side dilute solution sent to the low temperature side regenerator, and the variation range of the solution concentration in the high temperature side regenerator is reduced to the low temperature side regenerator. The solution concentration of the hot concentrated solution sent from the high temperature side regenerator is larger than the change width of the solution concentration in the side regenerator, and the solution concentration of the low temperature side concentrated solution sent from the low temperature side regenerator Ri Citea lower than the concentration,
The high temperature side concentrated solution delivered from the high temperature side regenerator and the low temperature side concentrated solution delivered from the low temperature side regenerator are merged, and the merged concentrated solution is absorbed by the refrigerant in the first absorber,
The dilute solution produced in the first absorber is sent to the low temperature side regenerator, and the high temperature side dilute solution is further absorbed in the second absorber and then sent to the high temperature side regenerator. A multi-effect absorption refrigerator that is divided into a solution . A first evaporator that absorbs the generated refrigerant vapor in the first absorber that generates the low temperature side diluted solution, and a second evaporator that absorbs the generated refrigerant vapor in the second absorber that generates the high temperature side diluted solution. And
In the form of passing a cooling target heat medium from the second evaporator in the order of the first evaporator, a multiple effect absorption according to claim 1 that is a configuration of sequentially cooling in those evaporator Type refrigerator. An intermediate temperature regenerator and a low temperature regenerator are provided as the low temperature side regenerator,
The generated refrigerant vapor in the high temperature side regenerator is used as a heating source for the intermediate temperature regenerator, and the generated refrigerant vapor in the intermediate temperature regenerator or the condensate refrigerant after being used as a heating source in the intermediate temperature regenerator is the low temperature The multi-effect absorption refrigerator according to any one of claims 1 to 4, wherein the multi-effect type is used as a heat source for the regenerator .

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