JP4318629B2 - Cooling water transfer system to refrigerator and cooling water transfer method to refrigerator - Google Patents

Description

  The present invention relates to a technique for improving the coefficient of performance of a refrigerator, and more particularly to a technique for supplying cooling water to an absorption refrigerator.

  There is a refrigerator as an apparatus for producing cold water for cooling used for buildings such as factories, large buildings, and large buildings, or for producing products or storing raw material products.

  There are several types of refrigerators. Among these, a refrigerator called an absorption refrigerator is an evaporator that evaporates a refrigerant liquid to produce cold water to be supplied to a heat load, and a refrigerant vapor generated by the evaporator is sent to the refrigerant. An absorber that absorbs the vapor into the absorbing liquid, and the absorbing liquid that has become a dilute solution by absorbing the refrigerant vapor in the absorber and releases the refrigerant liquid as the refrigerant vapor from the absorbing liquid, thereby absorbing the liquid These components are connected to a generator that restores the power to absorb refrigerant vapor by making the solution into a concentrated solution, a condenser that condenses the refrigerant vapor released from the absorbing liquid in the generator by cooling, and generates refrigerant liquid. A pipe that performs the above-described operation, and the refrigerant liquid, the refrigerant vapor, the absorption liquid, or the absorption liquid containing the refrigerant liquid is conveyed between the members through the pipe.

  The absorption refrigerator is connected to a cooling tower that conveys cooling water to the absorber and the condenser.

  In the evaporator, a water flow pipe as a cold water generation pipe, which is a pipe for generating the cold water by a refrigerator, is provided in a coil shape, and the evaporator is sufficiently insulated. Therefore, when water is caused to flow through the water flow pipe, the refrigerant liquid can only take heat from the water flow pipe in the evaporator, so that the water in the water flow pipe arranged in a coil shape is cooled. Then, as described above, the cooled cold water is conveyed as a medium for cooling or cooling for production of products or storage of raw material products.

  Absorption chillers use kerosene and gas to burn energy instead of electricity, use the heat that is obtained as it is, and finally use the heat in the form of energy to operate the refrigerator. And does not require a motor.

  Therefore, the operation is quiet and there is almost no noise and vibration, it is a non-fluorocarbon type that does not destroy the ozone layer because water is used as the refrigerant, and the main energy is non-electricity, and it is popular for power saving. is doing.

Coefficient of performance (Coefficient) which is an index representing the efficiency of absorption refrigerators among absorption refrigerators
A double-effect absorption refrigerator having an enhanced performance (COP) has been proposed.

  The double-effect absorption refrigerator has two generators, a first generator and a second generator, as is well known, and absorbs refrigerant vapor generated in the evaporator into the diluted solution by absorbing in the absorber. After the liquid is heated in the first generator, the refrigerant vapor generated in the first generator is also used in the second generator as a heat source to generate refrigerant vapor in the absorbing liquid, thereby increasing the coefficient of performance. Absorption refrigerator.

  FIG. 3 is a conceptual diagram of a cooling water transport system that transports cooling water to such a double-effect absorption refrigerator.

  In the figure, reference numeral 830 indicates an absorber, 834 indicates a first generator, 835 indicates a second generator, 836 indicates a condenser, 837 indicates an evaporator, and 840 indicates a cooling tower. The line connecting them is a pipe.

  In the conventional cooling water transfer system, the cooling water from the cooling tower 840 first passes through the absorber 830 and then returns to the cooling tower 840 via the condenser 836.

  The cooling water flows from the second generator 835 to the condenser 836 from the second generator 835 when it passes through the condenser 836 and the heat of the refrigerant vapor flowing into the absorber 830 from the evaporator 837 when passing through the absorber 830. Takes away the heat of the incoming refrigerant vapor.

  The cooling water that has absorbed heat is then cooled in the cooling tower 840 and flows again into the absorber 830, and this is repeated.

In addition, patent documents 1 and 2 are mentioned as a literature about the cooling water conveyance system to a double effect type absorption refrigerator, for example.
JP 11-2111262 A Japanese Patent No. 3013585

  As described above, the double-effect absorption refrigerator is a first generator after the absorption liquid that has been diluted by absorbing the refrigerant vapor generated in the evaporator in the absorber is heated in the first generator. The refrigerant vapor generated in the vessel is also heated in the second generator as a heat source to generate the refrigerant vapor, thus increasing the coefficient of performance and contributing to energy saving.

  However, in the conventional cooling water transfer system to the refrigerator, as described above, the cooling water first passes through the absorber and then returns to the cooling tower through the condenser. Was supplied with high-temperature cooling water that had previously absorbed heat at the absorber.

  Further, in the double effect absorption refrigerator, the lower limit value of the cooling water temperature is limited to about 25 ° C., for example, in order to prevent crystallization of the absorbing liquid in the absorber. Therefore, the cooling water supplied to the condenser is controlled to a degree that does not always cause crystallization, for example, 25 ° C. or higher. Therefore, it has been a constraint for improving the coefficient of performance.

  The present invention has been made in view of such circumstances, and the problem to be solved is to lower the temperature of the cooling water conveyed to the condenser of the double-effect absorption refrigerator, The purpose is to improve the coefficient of performance more than ever, thereby reducing the consumption of kerosene and gas, which are the operating energy of the double-effect absorption refrigerator, and further promoting energy saving.

  Therefore, the present invention employs the following means.

That is, the cooling water transfer system to the refrigerator according to the present invention includes an evaporator that evaporates the refrigerant liquid to generate refrigerant vapor, and the refrigerant vapor generated in the evaporator is sent, and the refrigerant vapor is absorbed by the absorption liquid. And an absorber in which the absorbing liquid is a dilute solution having a low refrigerant vapor absorption capacity, and the dilute solution is transported from the absorber, and the dilute solution is heated to convert the refrigerant liquid from the dilute solution into atmospheric pressure refrigerant vapor. By releasing, the first generator that makes the dilute solution an intermediate concentration solution whose refrigerant vapor absorption capacity is higher than that of the dilute solution, and the intermediate concentration solution is transported from the first generator, and further from the intermediate concentration solution, the By releasing the refrigerant liquid as low-pressure refrigerant vapor, the intermediate concentration solution is made a concentrated solution, thereby restoring the refrigerant vapor absorption capacity of the absorption liquid, and in the same pressure region as the second generator A second generator A condenser for condensing the low-pressure refrigerant vapor released from the intermediate-concentration solution by cooling and returning the refrigerant liquid to the refrigerant liquid, and a pipe for connecting these members. Cooling from a cooling tower through a flow path to a double-effect absorption refrigerator that conveys steam, normal-pressure refrigerant vapor, low-pressure refrigerant vapor, dilute solution, intermediate concentration solution, or concentrated solution between the members In the cooling water conveyance system to the refrigerator that conveys water, a cooling water direct conveyance path that conveys the cooling water directly from the cooling tower to the condenser is provided between the cooling tower and the condenser in the flow path. It is formed.

  The term “directly” means not going through the absorber.

  Therefore, according to the cooling water conveyance system to the refrigerator of the present invention, low-temperature cooling water is directly supplied to the condenser from the cooling tower, in other words, the cooling water conveyed to the condenser passes through the absorber. Therefore, the temperature of the cooling water conveyed to the condenser can be lowered accordingly. Thus, the condenser is cooled to a low temperature and the pressure is reduced.

  Since the second generator and the condenser are provided in the same region in terms of pressure, the pressure drop in the condenser reaches the second generator.

  For this reason, in the second generator, the refrigerant liquid is easily released from the intermediate concentration solution as low-pressure refrigerant vapor. If the amount of low-pressure refrigerant vapor discharged from the second generator increases, the amount of refrigerant liquid generated by the condenser also increases.

  Therefore, it can be said that the ratio of the refrigerant generation amount to the heating amount of the absorbent in the first generator increases.

  Therefore, according to the cooling water conveyance system to the refrigerator of the present invention, the coefficient of performance of the double effect absorption refrigerator can be increased, and the consumption of kerosene and gas can be reduced.

  As a result, energy saving can be promoted.

  Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the accompanying drawings. (First embodiment)

  A first embodiment of a cooling water transfer system to a refrigerator according to the present invention will be described with reference to FIG.

  The cooling water transfer system I to the refrigerator according to the first embodiment shown in FIG. 1 connects the double-effect absorption refrigerator 1 and the cooling tower 11 by a flow channel 16, and passes through this flow channel 16. Then, cooling water is supplied from the cooling tower 11 to the double-effect absorption refrigerator 1, and the cooling water is circulated between the double-effect absorption refrigerator 1 and the cooling tower 11, thereby having the double-effect absorption refrigeration. This is a system for producing cold water (medium) from the machine 1 for cooling or for production of products or storage of raw material products.

The double-effect absorption refrigerator 1 has an evaporator 3 that evaporates the refrigerant liquid 31 to generate refrigerant vapor, and the refrigerant vapor is sent to the absorbed refrigerant (for example, lithium bromide liquid). The absorber 5 to be absorbed and the absorbing liquid that has absorbed the refrigerant vapor are heated, and the refrigerant liquid 31 is discharged from the absorbing liquid as refrigerant vapor so that the refrigerant vapor absorption capacity of the absorbing liquid can be enhanced and the refrigerant vapor can be absorbed again. And the refrigerant liquid 31 which is condensed by cooling the refrigerant vapor released from the absorbing liquid.
And a condenser 9 for connecting the members 3, 5, 7, 9.

  Cooling water conveyed from the cooling tower 11 to the double effect absorption refrigerator 1 is sent to the absorber 5 and the condenser 9.

  There are two generators 7, a first generator 71 and a second generator 72, and the refrigerant vapor generated in the first generator 71 is used for heating in the second generator 72.

  Between the evaporator 3 -the absorber 5 -the first generator 71 -the second generator 72 -the condenser 9 -the evaporator 3, the refrigerant liquid 31, the refrigerant vapor, or the refrigerant liquid is included through the various pipes. Absorbent liquid flows (the direction of flow is indicated by an arrow on the side of each pipe). However, the absorbing liquid does not flow between the second generator 72, the condenser 9 and the evaporator 3.

  Although the 2nd generator 72 is provided in the same cylindrical container 100 with the evaporator 3, the absorber 5, and the condenser 9, the 1st generator 71 is the heat exchanger, pump, and other components which are mentioned later At the same time, it is provided separately from the cylindrical container 100.

  The evaporator 3, the absorber 5, the condenser 9 and the second generator 72 are defined in the cylindrical container 100, but between the evaporator 3 and the absorber 5 and between the second generator 72 and the condenser 9. Between the two, the pressure is within the same region, and the refrigerant vapor can flow.

  Next, each of these members will be described.

  The evaporator 3 is configured such that the refrigerant liquid 31 is stored (see the fine circles in the figure). The evaporator 3 is provided with a refrigerant liquid spray pipe 34 so that the refrigerant liquid 31 can be sucked up by the evaporator pump 32 and sprayed into the evaporator 3.

  Further, a water flow pipe 36 as a cold water generation pipe is piped in the evaporator 3 in a coil shape. The evaporator 3 is sufficiently insulated.

  Therefore, when water is caused to flow through the water flow pipe 36, the evaporator 3 can only take heat from the water flow pipe 36 in the evaporator 3, so the water in the water flow pipe 36 is cooled, and the cooled water is described above. As described above, it is sent to the outside as cooling water (medium) for cooling or for production of products or storage of raw material products.

  The cold water sent to the outside is returned to the water flow pipe 36 as water after being used outside.

  The refrigerant liquid 31 sprayed from the refrigerant liquid spraying pipe 34 receives heat from the return water and evaporates.

  The refrigerant liquid 31 becomes refrigerant vapor 311 c by heat received from the water flow pipe 36 and is sent to the absorber 5. In addition to the refrigerant vapor 311c, there are refrigerant vapors indicated by reference numerals 311a and 311b described later (refer to the short bar portion in the figure for the refrigerant vapor).

  The absorber 5 is connected in pressure to the evaporator 3 and stores an absorbing liquid. Then, the stored absorption liquid is sucked up by the absorber pump 52 and sprayed into the absorber 5 via the absorption liquid spray pipe 54. The evaporator 3 is maintained at an extremely low pressure due to the influence of the absorbing liquid in the absorber 5. The property change of the absorbing liquid will be described in detail later.

In the absorber 5, the refrigerant vapor 311c flowing from the evaporator 3 is liquefied into the refrigerant liquid 31,
In order to make the refrigerant liquid 31 easily absorbed by the absorbing liquid, a water flow pipe 56A through which cooling water (not shown) from the cooling tower 11 passes is provided in a coil shape.

  The water flow pipe 56A can be said to be a cooling water heat exchanger because heat is exchanged between the cooling water and the refrigerant vapor 311c by flowing cooling water through the water flow pipe 56A.

  Further, the absorber 5 is equipped with a known bleed device 57.

  In addition, the absorber 5 is provided with a generator pump 712 that conveys the absorption liquid stored therein to the first generator 71. The absorption liquid circulates in the order of absorber 5 -first generator 71 -second generator 72 -absorber 5, but the property differs depending on where it flows.

  The absorbing liquid from the absorber 5 to the first generator 71 is a dilute solution in which the refrigerant vapor 311c is absorbed by the absorbing liquid in the absorber 5, and is denoted by reference numeral 51a (see the pear-shaped portion in the figure). .

  Further, the absorbing liquid from the first generator 71 to the second generator 72 heats the diluted solution 51a and releases the refrigerant liquid 31 from the diluted solution 51a as the atmospheric pressure refrigerant vapor 311a. This is an intermediate concentration solution having a higher absorption capacity than that of the dilute solution 51a, and is denoted by reference numeral 51b (see the broken line in the figure).

  And the absorption liquid from the 2nd generator 72 to the absorber 5 makes the refrigerant | coolant vapor | steam absorption power higher than the intermediate | middle concentration solution 51b by releasing the refrigerant | coolant liquid 31 from the intermediate concentration solution 51b as the low pressure refrigerant | coolant vapor | steam 311b. This is a concentrated solution and is indicated by reference numeral 51c (see the hatched portion in the figure).

  The dilute solution 51a that is flowed by the generator pump 712 provided in the absorber 5 is sent to the first generator 71 through the pipe 571 for carrying the absorbent. This pipe 571 is referred to as a first regenerating absorbent transport pipe.

  A second heat exchanger 132, a solution adjustment valve 15, and a first heat exchanger 131 are attached to the first regeneration absorbent transport pipe 571 from the upstream side.

  In the first generator 71, a high-pressure steam flow pipe (heater) 711 for heating the dilute solution 51a flowing in from the absorber 5 with high-pressure steam is piped in a coil shape. By the heating by the high-pressure steam flow pipe 711, the refrigerant liquid 31 is released from the dilute solution 51a as the normal pressure refrigerant vapor 311a.

  By doing so, the dilute solution 51a is regenerated, becomes an intermediate concentration solution 51b having a higher refrigerant vapor absorption capacity than the dilute solution 51a, and is stored in the first generator 71.

  Further, the first generator 71 is provided with a refrigerant vapor flow pipe 722 that conveys the normal pressure refrigerant vapor 311 a generated from the dilute solution 51 a to the second generator 72.

  The portion of the refrigerant vapor feed pipe 722 that is piped to the second generator 72 is coiled and connected to the condenser 9 via the second generator 72. A trap is provided between the second generator 72 and the condenser 9 in the refrigerant vapor flow pipe 722.

  Further, the first generator 71 is provided with a pipe 724 that conveys the intermediate concentration solution 51b having a higher refrigerant vapor absorption capability than the dilute solution 51a to the second generator 72. This pipe 724 is referred to as a second regeneration absorbent transport pipe.

  A first heat exchanger 131 and a drain heat exchanger 726 are sequentially arranged from the upstream side in the second regeneration absorbent transport pipe 724. As described above, since the first regeneration absorbent transport pipe 571 also passes through the first heat exchanger 131, the first regeneration absorbent transport pipe 571 is used in the first heat exchanger 131. Is exchanged between the dilute solution 51a conveyed to the intermediate concentration solution 51b conveyed through the second regeneration absorbent conveying pipe.

  A high pressure steam flow pipe 711 is passed through the drain heat exchanger 726, and the high pressure steam is processed as a steam drain via the drain heat exchanger 726.

  In the second generator 72, the intermediate-concentration solution 51b introduced from the first generator 71 is the normal pressure refrigerant vapor sent from the first generator 71 via its own retained heat and the refrigerant vapor feed pipe 722. Further regeneration is achieved by the heat of 311a, and a concentrated solution 51c is obtained. The refrigerant vapor absorption capacity of the concentrated solution 51c is higher than that of the intermediate concentration solution 51b.

  A pipe 511 that conveys the concentrated solution 51 c to the absorber 5 is connected to the absorber pump 52 of the absorber 5 via the second heat exchanger 132. This pipe 511 is referred to as a post-regeneration absorbent transport pipe. Since the second heat exchanger 132 also passes through the first regeneration absorbent transport pipe 571 as described above, the concentrated solution 51c transported through the post-regeneration absorbent transport pipe 511 and the first regeneration absorption. Heat exchange is performed with the dilute solution 51a transported through the liquid transport pipe 571.

  Then, the regenerated concentrated solution 51c is sent to the absorber 5 by the absorber pump 52 and sprayed there as described above. The sprayed solution 51b absorbs the refrigerant vapor 311c as described above, and as a result, is supplied as an absorbing liquid that becomes the dilute solution 51a.

  The condenser 9 is equipped with a water flow pipe 56 </ b> B so that cooling water is supplied from the cooling tower 11.

  The water flow pipe 56 </ b> B is configured so that cooling water can be directly supplied to the condenser 9 from the cooling tower 11. Direct means not going through the absorber. The cooling water that has flowed out of the water flow pipe 56B of the condenser 9 has a part that flows to the water flow pipe 56A of the absorber 5 and a part that returns to the cooling tower 11 via a bypass passage 172 described later.

  Specifically, the cooling tower 11 and the condenser 9 are connected to the condenser 9 as a cooling water direct conveyance path for directly conveying the cooling water from the cooling tower 11 to the condenser 9 and circulating the cooling water between the two. A circulation path 17 is formed, and a part thereof is a water flow pipe 56B. In the present embodiment, the anti-condenser circuit 17 is also a source flow line for an anti-absorber circuit 19 described later.

  The water flow pipe 56B is a cooling water heat exchanger because heat is exchanged between the cooling water and the refrigerant vapor 311b by flowing cooling water through the water flow pipe 56B. The cooling water supplied from the cooling tower 11 to the condenser 9 by the heat exchange cools the condenser 9 and raises the temperature somewhat.

  A cooling water pump 171 is attached upstream of the water flow pipe 56B.

  The cooling water pump 171 is for circulating the cooling water in the flow path 16.

  The anti-condenser circulation path 17 is connected to a communication path 175 for transporting the cooling water after passing through the condenser 9 to the absorber 5.

The anti-condenser circulation path 17 is connected to an anti-absorber circulation path 19, which is another circulation path for circulating the cooling water after passing through the condenser 9 between the condenser 5. A part of the anti-absorber circulation path 19 is the water flow pipe 56A.

  The absorber circulation path 19 is provided with an inlet 19i for receiving cooling water via the condenser 9 and an outlet 19o for discharging the cooling water toward the cooling tower 11, and the condenser 19 is provided at the inlet 19i. The communication path 175 for transporting the cooling water after passing through 9 to the absorber 5 transports the cooling water in the absorber circulation path 19 to the discharge port 19 o to the cooling tower 11 via the condenser circulation path 17. A cooling water feed path 177 is connected.

  If the above is seen from the flow of the cooling water, the cooling water cooled by the cooling tower 11 is the forward path of the condenser circulation path 17-the forward path of the absorber circulation path 19-the backward path of the absorber circulation path 19-the condensation. It flows in the flow path 16 which consists of the return path-cooling tower 11 of the vessel circulation path 17 in order.

  Between the communication path 175 and the cooling water feed path 177, there is a bypass path 172 that connects the two and forms a part of the condenser circulation path 17. A bypass valve 2 is provided in the bypass passage 172.

  Further, in the portion of the anti-absorber circuit 19, the portion connecting the inlet 19 i for introducing the cooling water from the anti-condenser circuit 17 and the discharge port 19 o for discharging the cooling water to the anti-condenser circuit 17, An absorber cooling water circulation pump 191 is provided for circulating cooling water in the absorber circulation path 19.

  A check valve 193 is attached in the vicinity of the downstream side of the absorber cooling water circulation pump 191.

  Reference numeral 195 denotes an absorber cooling water temperature controller that controls the cooling water temperature of the absorber 5.

  The absorber cooling water temperature controller 195 detects the inlet temperature t2 of the water flow pipe 56A piped in the absorber 5 in the anti-absorber circuit 19 with the thermometer T1, and the target temperature of the cooling water is 22 ° C.- The bypass valve 2 and the absorber cooling water circulation pump 191 are controlled so that the temperature of the cooling water supplied to the absorber 5 is always within a certain range so that it is in the range of 25 ° C. Then, the cooling water is conveyed to the absorber 5.

  Therefore, the absorber cooling water temperature controller 195, the bypass valve 2 and the absorber cooling water circulation pump 191 can be said to be absorber supply cooling water temperature holding means.

  Thus, by keeping the temperature of the cooling water supplied to the absorber 5 constant within the target temperature, it is possible to prevent the absorption liquid from being crystallized by supplying the low-temperature cooling water to the absorber 5. it can.

  In addition to the above, the absorber cooling water temperature controller 195 measures the inlet temperature t1 of the water flow pipe 56B with the thermometer T2 so that the temperature of the cooling water supplied to the condenser 9 becomes a suitable temperature. Also control.

  The cooling water pump 171 and the absorber cooling water circulation pump 191 are provided with inverters 171a and 191a, respectively, to control the pump capacity.

  The arrows relating to the condenser circulation path 17 and the absorber circulation path 19 indicate the flow direction of the cooling water in these circulation paths.

The cooling water in the anti-condenser circulation path 17 is the cooling tower 11 -cooling water pump 171 -water flow pipe 5
6B-bypass 172 (if the temperature of the cooling water supplied to the absorber 5 is below a predetermined range, the flow rate increases depending on the temperature. If it is within the predetermined range, it does not flow.)-Circulates in the order of the cooling tower 11 To do.

  In the anti-absorber circulation path 19, the cooling water discharged from the water flow pipe 56 </ b> B passes through the communication path 175, and then the water flow pipe 56 </ b> A-absorber cooling water circulation pump 191-check valve 193-water flow pipe 56 </ b> A. Cycle in order. Further, a part of the cooling water circulated through the counter-absorber circulation path 19 is directed from the discharge port 19o to the cooling tower 11, and again passes through the water flow pipe 56B and the communication path 175 from the cooling tower 11 through the counter-condenser circulation path 17. To the water flow pipe 56A. Further, the above is a case where the temperature of the cooling water supplied to the absorber 5 is within a predetermined range. In this case, the higher the inlet temperature of the absorber 5 is, the higher the amount of cooling water returned by the absorber cooling water circulation pump 191 is. The amount of cooling water goes straight and returns to the cooling tower 11 via the cooling water feed path 177.

  The thermometer T1 may be installed at a position on the outlet side of the water flow pipe 56A of the absorber 5, and the bypass valve is a two-way valve, but may be a three-way valve.

  Furthermore, the temperature difference between the inlet and outlet of the water flow pipe 56B on the condenser 9 side may be measured, and the rotational speed of the cooling water pump 171 may be increased when the temperature difference is small.

  Next, the effect of the cooling water conveyance system I to the refrigerator having such a configuration will be described.

  Low-temperature cooling water is directly supplied to the condenser 9 from the cooling tower 11 via the condenser circulation path 17. In other words, the cooling water having a temperature substantially not different from the temperature of the cooling water immediately after leaving the cooling tower 11 is conveyed to the condenser 9.

  Therefore, the water flow pipe 56B that functions as a cooling water heat exchanger cools the inside of the condenser 9 rapidly. For this reason, as for the cooling water conveyed to a condenser, the pressure in the condenser 9 falls compared with the case where it is conveyed to a condenser after passing this through an absorber.

  Since the condenser 9 and the second generator 72 are provided in the same area in terms of pressure, the pressure drop in the condenser 9 reaches the second generator 72 as well.

  Therefore, in the second generator 72, the refrigerant liquid 31 is easily released as the low-pressure refrigerant vapor 311b from the intermediate concentration solution 51b.

  If the discharge amount of the low-pressure refrigerant vapor 311b in the second generator 72 increases, the amount of the refrigerant liquid 31 generated by the low-pressure refrigerant vapor 311b condensed in the condenser 9 by cooling with the cooling water in the water flow pipe 56B is also increased. Increase.

  Therefore, it can be said that the ratio of the refrigerant generation amount to the heating amount of the absorbing liquid in the first generator 71 increases.

  In addition, the temperature of the cooling water which does not change substantially from the temperature of the cooling water immediately after leaving the cooling tower 11 means a temperature range in which the above effect can be achieved.

  Also, the absorber 5 can be supplied with cooling water whose temperature is appropriately controlled.

As a result of a trial calculation of the amount of heat loss, the cooling capacity, the performance count, and the energy consumption at the maximum load when the present inventor uses the cooling water transfer system I to the refrigerator having such a configuration, the results are compared with the system of FIG. Thus, it is said that 92% of the energy is consumed.
(Second Embodiment)

  With reference to FIG. 2, the cooling water conveyance system II to the refrigerator which concerns on 2nd Embodiment is demonstrated. This system II is different from the cooling water transfer system I to the refrigerator according to the first embodiment in that the flow path 16 connecting the double effect absorption refrigerator 1 and the cooling tower 11 and this It is only the part related to. Therefore, only the said difference is demonstrated, the same code | symbol is attached | subjected to the same part and description is abbreviate | omitted.

  In the flow path 16 according to the second embodiment, in addition to the cooling water direct conveyance path 17 that conveys the cooling water directly from the cooling tower 11 to the condenser 9, between the cooling tower 11 and the absorber 5. In addition, an anti-absorber circulation path 19 </ b> A that is another cooling water direct conveyance path for directly conveying the cooling water from the cooling tower 11 to the absorber 5 is formed. That is, the anti-condenser circuit 17 and the anti-absorber circuit 19A are arranged in parallel. However, a part of the anti-absorber circulation path 19 </ b> A shares a part of the anti-condenser circulation path 17 that directly conveys the cooling water from the cooling tower 11 to the condenser 9.

  In the cooling water transfer system II to the refrigerator according to the second embodiment, the counter-condenser circulation path 17 that transfers the cooling water directly from the cooling tower 11 to the condenser 9 and the cooling tower 11 Since an anti-absorber circulation path 19 </ b> A that directly conveys cooling water to the absorber 5 through a part of the condenser circulation path 17 is provided in parallel, the cooling tower 11 connects the condenser 9 and the absorber 5. The cooling water sent is bisected. That is, the first embodiment is a series system in which the cooling water is guided in the order of the condenser 9 → the absorber 5, whereas in the second embodiment, the cooling water is parallel to both 9 and 5. It can be said that it leads to Both are supplied with cooling water at substantially the same temperature almost simultaneously.

A condenser cooling water pump 173 and an absorber cooling water pump 192, which are independent cooling water pumps, are provided in the anti-condenser circulation path 17 and the anti-absorption circuit 19A, respectively. The condenser cooling water pump 173 is provided at an upstream location in the water flow pipe 56B, and the absorber cooling water pump 192 is provided at a location upstream of the water flow pipe 56A in the absorber circuit 19A. However, as long as the mounting position of the absorber cooling water pump 192 is downstream from the water flow pipe 56B, it may be a downstream location of the water flow pipe 56A. In this case, the cooling water is absorbed instead of the push-in system.

  The cooling water in the counter condenser circulation path 17 circulates in the order of the cooling tower 11 -the condenser cooling water pump 173 -the water flow pipe 56B -the cooling tower 11.

  In the anti-absorber circulation path 19A, the cooling tower 11 circulates in the order of the absorber cooling water pump 192, the water flow pipe 56A, and the cooling tower 11.

  In addition, since this Embodiment is a parallel system, it branches from the main pipe (combined pipe | tube of the anti-condenser circulation path 17 and the anti-absorber circulation path 19), and a branch pipe is made around both water flow pipes 56B and 56A, respectively. The pumps 173 and 192 may be provided in the branch pipes.

  Further, the anti-absorber circulation path 19A has a forward path and a return path of the anti-absorber circulation path 19A so that the temperature of the cooling water supplied to the absorber 5 is always kept at the target temperature within a certain range. It connects with connection path 19A1, and absorber cooling water circulation pump 191 is provided in connection path 19A1. By the operation of the absorber cooling water circulation pump 191, a part of the cooling water via the water flow pipe 56A circulates between the water flow pipe 56A without returning to the cooling tower 11.

In the second embodiment, the cooling water sent from the cooling tower 11 to the condenser 9 and the absorber 5 is divided into two as described above. Therefore, when the capacity of the cooling tower 11 of the cooling water transfer system II is the same as that of the cooling tower 11 of the cooling water transfer system I, the cooling water transfer system II
Since the amount of the low-pressure refrigerant vapor 311b generated in the condenser 9 is reduced at least, the capacity of the cooling tower 11 is increased to compensate for this.

  Therefore, in the cooling water transfer system II, the initial cost is higher than that of the cooling water transfer system I, but it is possible to transfer the low-temperature cooling water from the cooling tower 11 directly to both the condenser 9 and the absorber 5. As a result, higher efficiency can be expected. As a result, running costs can be reduced.

  In the case of the second embodiment, as in the first embodiment, the coefficient of performance of the double-effect absorption refrigerator can be increased and the consumption of kerosene and gas can be reduced. As a result, energy saving can be promoted.

  In addition, this invention is not limited only to the above-mentioned illustration example, Of course, various changes can be added within the range which does not deviate from the summary of this invention.

  In addition, if the amount of refrigerant vapor released by the generator increases, the amount of refrigerant liquid generated by the condenser also increases. Therefore, the generator is not limited to a double-effect absorption refrigerator, and the generator is a single unit. Therefore, the present invention can be applied to an absorption refrigerator in which the condenser and the generator are provided in the same pressure region.

It is a schematic explanatory drawing of the double effect type absorption refrigerator which concerns on this invention. It is a schematic explanatory drawing of the double effect type absorption refrigerator which concerns on this invention. It is a figure for demonstrating a prior art.

Explanation of symbols

I Cooling water transfer system to refrigerator II Cooling water transfer system to refrigerator 1 Double-effect absorption refrigerator 2 Bypass valve 3 Evaporator 5 Absorber 7 Generator 9 Condenser 11 Cooling tower 15 Solution adjustment valve 16 Flow Route 17 Condenser circulation path (cooling water direct conveyance path / circulation path)
19 Anti-absorber circuit (another circuit)
19A Anti-absorber circulation path (another cooling water direct conveyance path)
19A1 Connection 19i Inlet 19o Discharge 31 Refrigerant liquid 32 Evaporator pump 34 Refrigerant liquid spray pipe 36 Water flow pipe 51a Diluted solution 51b Intermediate concentration solution (absorbing liquid)
51c Concentrated solution 52 Absorber pump 54 Absorbing liquid spray pipe 56A Water flow tube 56B Water flow tube 57 Extraction device 71 First generator 72 Second generator 100 Cylindrical vessel 131 First heat exchanger 132 Second heat exchanger 171 Cooling water Pump 171a Inverter 172 Bypass path 173 Condenser cooling water pump 175 Connection path 177 Cooling water feed path 191 Absorber cooling water circulation pump 191a Inverter 193 Check valve 195 Absorber cooling water temperature controller 311a Normal pressure refrigerant vapor 311b Low pressure refrigerant vapor 311c Refrigerant vapor 511 Regenerated absorbent transport pipe 571 First regeneration absorbent transport pipe 711 High pressure steam feed pipe 712 Generator pump 722 Refrigerant vapor feed pipe 724 Second regeneration absorbent transport pipe 726 Drain heat exchanger T1 thermometer T2 thermometer t1 inlet temperature t2 inlet temperature

Claims (5)

An evaporator for evaporating the refrigerant liquid to produce refrigerant vapor;
Refrigerant vapor generated in the evaporator is sent, and the absorber vapor is absorbed into the absorption liquid, and the absorption liquid is a dilute solution having a low refrigerant vapor absorption capacity; and
The dilute solution is conveyed from the absorber, and the dilute solution is heated to release the refrigerant liquid from the dilute solution as normal pressure refrigerant vapor, so that the dilute solution has a higher refrigerant vapor absorption capacity than the dilute solution. A first generator as a concentration solution;
The intermediate concentration solution is transported from the first generator, and the refrigerant liquid is further discharged as low-pressure refrigerant vapor from the intermediate concentration solution, so that the intermediate concentration solution becomes a concentrated solution, and thus the refrigerant vapor absorbency of the absorbing liquid A second generator for restoring
A condenser that is provided in the same pressure region as the second generator, and that condenses the low-pressure refrigerant vapor released from the intermediate concentration solution in the second generator by cooling and returns the refrigerant liquid to the refrigerant liquid;
A pipe connecting these members, and through the pipe, the refrigerant liquid, the refrigerant vapor, the atmospheric pressure refrigerant vapor, the low-pressure refrigerant vapor, the dilute solution, the intermediate concentration solution or the concentrated solution is passed between the members. In the cooling water transport system to the refrigerator that transports the cooling water from the cooling tower through the flow path to the double-effect absorption refrigerator that is transported by
Between the cooling tower and the condenser in the flow path, a cooling water direct conveyance path for directly conveying the cooling water from the cooling tower to the condenser is formed,
The cooling water direct conveyance path is a circulation path through which cooling water circulates between the cooling tower and the condenser, and the cooling water direct conveyance path absorbs the cooling water after passing through the condenser. Another circulation circuit that circulates between
With respect to the another circulation path, the temperature of the cooling water passing through these paths is kept constant, and the temperature of the cooling water supplied to the absorber is kept constant.
The absorber supply cooling water temperature maintaining means is:
A communication path for transporting the cooling water after passing through the condenser to the absorber, and a cooling water feed path for transporting the cooling water in the other circulation path to the cooling tower via the circulation path. A bypass valve provided in a bypass path that forms a part of the circulation path;
An absorber cooling water circulation pump for circulating cooling water in the separate circulation path;
Absorber cooling for transporting cooling water to the absorber by controlling both the bypass valve and the absorber cooling water circulation pump so that the temperature of the cooling water supplied to the absorber is within a certain range. A water temperature controller,
Cooling water transfer system to the refrigerator. An evaporator for evaporating the refrigerant liquid to produce refrigerant vapor;
Refrigerant vapor generated in the evaporator is sent, and the absorber vapor is absorbed into the absorption liquid, and the absorption liquid is a dilute solution having a low refrigerant vapor absorption capacity; and
The dilute solution is conveyed from the absorber, and the dilute solution is heated to release the refrigerant liquid from the dilute solution as normal pressure refrigerant vapor, so that the dilute solution has a higher refrigerant vapor absorption capacity than the dilute solution. A first generator as a concentration solution;
The intermediate concentration solution is transported from the first generator, and the refrigerant liquid is further discharged as low-pressure refrigerant vapor from the intermediate concentration solution, so that the intermediate concentration solution becomes a concentrated solution, and thus the refrigerant vapor absorbency of the absorbing liquid A second generator for restoring
A condenser that is provided in the same pressure region as the second generator, and that condenses the low-pressure refrigerant vapor released from the intermediate concentration solution in the second generator by cooling and returns the refrigerant liquid to the refrigerant liquid;
A pipe connecting these members, and through the pipe, the refrigerant liquid, the refrigerant vapor, the atmospheric pressure refrigerant vapor, the low-pressure refrigerant vapor, the dilute solution, the intermediate concentration solution or the concentrated solution is passed between the members. In the cooling water transport system to the refrigerator that transports the cooling water from the cooling tower through the flow path to the double-effect absorption refrigerator that is transported by
Between the cooling tower and the condenser in the flow path, a cooling water direct conveyance path for directly conveying the cooling water from the cooling tower to the condenser is formed,
Another cooling water direct conveyance path that directly conveys cooling water from the cooling tower to the absorber is formed between the cooling tower and the absorber among the flow paths,
Absorber supply cooling water temperature holding means for keeping the temperature of the cooling water passing through these paths constant and maintaining the temperature of the cooling water supplied to the absorber constant with respect to the other cooling water direct conveyance path. Have
The absorber supply cooling water temperature maintaining means is:
In order that the temperature of the cooling water supplied to the absorber is within a certain range, an absorber cooling water circulation pump is provided in the connecting path where the forward path and the return path of the other cooling water direct conveyance path are communicated with each other. ,
Cooling water transfer system to the refrigerator. An evaporator for evaporating the refrigerant liquid to produce refrigerant vapor;
Refrigerant vapor generated in the evaporator is sent, and the absorber vapor is absorbed into the absorption liquid, and the absorption liquid is a dilute solution having a low refrigerant vapor absorption capacity; and
This dilute solution is sent from the absorber, the dilute solution is heated, and the refrigerant liquid is discharged from the dilute solution as normal pressure refrigerant vapor, so that the dilute solution has a higher refrigerant vapor absorption capacity than the dilute solution. A first generator as a concentration solution;
The intermediate concentration solution is transported from the first generator, and the refrigerant liquid is further discharged as low-pressure refrigerant vapor from the intermediate concentration solution, so that the intermediate concentration solution becomes a concentrated solution, and thus the refrigerant vapor absorbency of the absorbing liquid A second generator for restoring
A condenser that is provided in the same pressure region as the second generator, and that condenses the low-pressure refrigerant vapor released from the intermediate concentration solution in the second generator by cooling and returns the refrigerant liquid to the refrigerant liquid;
A pipe connecting these members, and the refrigerant liquid, the refrigerant vapor, the normal pressure refrigerant vapor, the low pressure refrigerant vapor, the dilute solution, the intermediate concentration solution or the concentrated solution is passed between the members via the pipe. In the cooling water transport method to the refrigerator, in which the cooling water is circulated from the cooling tower to the double-effect absorption refrigerator to be transported,
The cooling water having a temperature substantially the same as the temperature of the cooling water immediately after leaving the cooling tower is directly transferred to the condenser,
Cooling water circulates between the cooling tower and the condenser,
Circulating the cooling water after passing through the condenser between the absorber and
Controlling the flow rate of the cooling water circulating between the cooling tower and the condenser and the flow rate of the cooling water circulating between the absorber after passing through the condenser, The temperature of the cooling water after passing through the condenser circulating between them is kept constant, and the temperature of the cooling water supplied to the absorber is adjusted.
A method for conveying cooling water to a refrigerator, characterized by being kept constant . An evaporator for evaporating the refrigerant liquid to produce refrigerant vapor;
Refrigerant vapor generated in the evaporator is sent, and the absorber vapor is absorbed into the absorption liquid, and the absorption liquid is a dilute solution having a low refrigerant vapor absorption capacity; and
This dilute solution is sent from the absorber, the dilute solution is heated, and the refrigerant liquid is discharged from the dilute solution as normal pressure refrigerant vapor, so that the dilute solution has a higher refrigerant vapor absorption capacity than the dilute solution. A first generator as a concentration solution;
The intermediate concentration solution is transported from the first generator, and the refrigerant liquid is further discharged as low-pressure refrigerant vapor from the intermediate concentration solution, so that the intermediate concentration solution becomes a concentrated solution, and thus the refrigerant vapor absorbency of the absorbing liquid A second generator for restoring
A condenser that is provided in the same pressure region as the second generator, and that condenses the low-pressure refrigerant vapor released from the intermediate concentration solution in the second generator by cooling and returns the refrigerant liquid to the refrigerant liquid;
A pipe connecting these members, and the refrigerant liquid, the refrigerant vapor, the normal pressure refrigerant vapor, the low pressure refrigerant vapor, the dilute solution, the intermediate concentration solution or the concentrated solution is passed between the members via the pipe. In the cooling water transport method to the refrigerator, in which the cooling water is circulated from the cooling tower to the double-effect absorption refrigerator to be transported,
The cooling water having a temperature substantially the same as the temperature of the cooling water immediately after leaving the cooling tower is directly transferred to the condenser,
Transfer cooling water directly from the cooling tower to the absorber,
The temperature of the cooling water passing through the path for directly conveying the cooling water from the cooling tower to the absorber is adjusted by adjusting the flow path of the connecting path where the forward path and the returning path of the cooling water conveyed directly from the cooling tower to the absorber are connected. The cooling water transport method to the refrigerator is characterized in that the temperature of the cooling water supplied to the absorber is kept constant while keeping the temperature constant . The cooling water conveyance method to the refrigerator according to claim 3 or 4 , wherein the cooling water conveyed to the condenser and heated by cooling the condenser is supplied to the absorber.

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