JPS60175978A - Multiple effect absorption type refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a multi-effect absorption refrigerating device, and in particular, a multi-effect absorption refrigerating device suitable for properly controlling the amount of solution circulating in a high-temperature regenerator to achieve energy saving and downsizing. This invention relates to an absorption type refrigeration device.

[Background of the invention]

In general, in absorption refrigerators that use water as a refrigerant and lithium bromide as an absorbent, in order to improve thermal efficiency by subtracting the heating star in the regenerator and the cooling type in the absorber, the amount of water flowing out from the regenerator is reduced. A solution heat exchanger is used that transfers heat held by a concentrated solution containing less refrigerant to a dilute solution containing more refrigerant supplied from an absorber.

In this solution heat exchanger, the dilute solution sent from the absorber to the regenerator is driven by a solution circulation pump, while the concentrated solution sent from the regenerator to the absorber is driven by the pressure difference between the two. In particular, in a triple-effect machine, the pressure in the high-temperature regenerator is high, so the pressure loss in the high-temperature heat exchanger that exchanges heat between the solution entering and exiting the high-temperature regenerator is increased to increase the heat transfer coefficient, and the heat exchanger can be made smaller.

However, since the pressure in the high-temperature regenerator is not high when the refrigerator is started, if the flow resistance of the high-temperature heat exchanger is large, the solution stops flowing and the liquid level in the high-temperature regenerator cannot be maintained.

For this reason, in reality, the flow resistance of the high-temperature heat exchanger is made small, and a control valve that changes the opening depending on the liquid level in the high-temperature regenerator is installed in the middle of the solution flow path, thereby controlling the pressure of the high-temperature regenerator. During low startup, the opening of the control valve is increased to allow the solution to flow easily, and during steady operation when the pressure of the high-temperature regenerator is high, the opening of the control valve is decreased to prevent excessive flow of solution.

For this reason, the pressure loss on the concentrated solution side from the high-temperature regenerator cannot be increased, so the heat transfer coefficient cannot be increased, resulting in a disadvantage that the high-temperature heat exchanger becomes large.

[Purpose of the invention]

The present invention was made to solve the problems of the prior art described above, and it is possible to properly control the solution @ ring member of a high temperature regenerator both at low pressure startup and during high pressure steady operation. The purpose of the present invention is to provide a multi-effect absorption refrigeration system that can improve the heat transfer coefficient of a high-temperature heat exchanger and downsize the high-temperature heat exchanger.

[Summary of the invention]

The configuration of the multi-effect absorption refrigeration apparatus according to the present invention includes a high-temperature regenerator that uses an external heat source as a heating source, and a refrigerant vapor generated in the high-temperature regenerator that is used for subsequent low-temperature regeneration (8). multiple regenerators each generating refrigerant vapor as sources, a condenser, and an evaporator.

In a multi-effect absorption refrigeration system consisting of an absorber, a solution heat exchanger, etc., and piping that connects the operating equipment of these absorption cycles, the solution outflow from the high temperature regenerator is
@ is branched, one side is connected to a solution heat exchanger, and the other side is connected to a bypass flow path that connects to a low-pressure solution path including each regenerator and absorber downstream of the high-temperature regenerator, and A control means for controlling the solution meteor is provided in the bypass channel.

Additionally, the idea behind developing the present invention is as follows.

In general, in a multi-effect absorption refrigerator, in order to improve thermal efficiency, heat is exchanged between the solutions flowing in and out of the high-temperature regenerator. Among the solutions flowing through the high-temperature heat exchanger, the solution from the high-temperature regenerator is
It can be driven by the pressure difference between a high temperature regenerator and an absorber, a high temperature regenerator and an intermediate temperature regenerator, or a high temperature regenerator and a low temperature regenerator. For example, in a dual-effect machine, the high temperature regenerator pressure is about 0.9 kg/am'', the absorber pressure is about 0.01 kg/am'', and the low temperature regenerator pressure is about 0.9 kg/am''.
9kg/cI112te, pressure difference is 0,8～
The value is approximately 0.9 kg/cm2, which can be used to drive the solution flowing through the high-temperature heat exchanger. In addition, in a triple effect device, for example, the pressure of the high temperature regenerator is approximately 3.8 kg/cm2.
becomes even larger, and the absorber pressure is approximately 0.01 kg.
/cm2+about 0.06kg/cm for low temperature regenerator”
, in the medium-temperature regenerator, it is approximately 0.6 kg/am", which is 3 kg
/cm" or more can be used.

Generally, in fluids flowing through channels of various shapes, a similar relationship is established between the pressure loss coefficient and the heat transfer coefficient, as is clear from the analogy of Colburn's j factor. That is, in a general flow, the larger the pressure loss, the larger the heat transfer coefficient can be.

Therefore, as described above, if the pressure loss in the high-temperature heat exchanger can be increased, the heat transfer coefficient can be increased and the high-temperature heat exchanger can be downsized.

The above-mentioned types of high-temperature heat exchangers include the shell and tube type, double tube type, plate type, and Nompson type.

It also functions as a heat exchanger, consisting of multiple flash chambers and absorption chambers, and uses the difference in saturated vapor pressure of the refrigerant to transfer refrigerant vapor from a high temperature, high concentration concentrated solution to a low temperature, low concentration dilute solution. Even when using a flash absorption heat exchanger that exchanges heat and concentrates the solution, by using a high pressure difference, the solution @ring member of the high temperature regenerator can be properly controlled, and the flash chamber, This has the advantage that the absorption chamber can be made compact.

However, in reality, when the refrigerator starts up, the pressure in the high-temperature regenerator does not rise and the pressure difference is small), so the pressure loss in the high-temperature heat exchanger is designed to be small so that the solution can be circulated even at this time. However, the heat transfer coefficient cannot be increased and the heat exchanger becomes large.

Also, during steady operation when the pressure of the high temperature regenerator is high,
The pressure head is wasted on control throttles, etc.

Therefore, in the present invention, the solution is made to flow through the bypass flow path with low flow resistance at startup, and during steady operation when the pressure of the high temperature regenerator is high, the bypass circuit is throttled to increase the flow resistance and the solution flows through the high temperature heat exchanger. By allowing the solution to flow, the heat transfer coefficient of the high-temperature heat exchanger can be increased and the high-temperature heat exchanger can be made smaller, and the amount of solution in the high-temperature regenerator and the amount of solution circulation can be appropriately controlled. I thought about it.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIG. 1 and FIG. 6. 1 First, FIG. 1 is a cycle diagram of a triple effect absorption refrigerator according to an embodiment of the present invention.

In FIG. 1, 1 is an evaporator, 2 is an absorber, and 3 is a condenser.

6 is a high-temperature/high-pressure high-temperature regenerator that heats the solution with an external heat source to generate refrigerant vapor and concentrate the solution.The high-temperature regenerator 6 includes a combustor 7 and a once-through heat exchanger 8. It consists of a gas-liquid separator 9, in which the solution heated by the combustion gas generated in the combustor 7 in the once-through heat exchanger 8 and brought to boiling Ba is separated into refrigerant vapor and 'a solution in the gas-liquid separator 9. It is something.

5 is a medium-temperature and medium-pressure medium-temperature regenerator that heats the solution using the latent heat of condensation of the refrigerant vapor generated in the high-temperature regenerator 6 as a main heating source to generate 7 to medium-pressure vapor; 4 is the medium-temperature regenerator; This is a low-temperature regenerator that heats a solution and generates refrigerant vapor using the latent heat of condensation of the refrigerant vapor generated in the vessel 5 as the main heating source.

10 is a solution heat exchanger on the low temperature side (hereinafter referred to as low temperature heat exchanger 5)
), 11 is a solution heat exchanger on the medium-temperature regenerator side (hereinafter referred to as medium-temperature heat exchanger), 12 is a solution heat exchanger on the high-temperature side (hereinafter referred to as high-temperature heat exchanger), which is the operating equipment of the absorption cycle, A triple-effect absorption chiller is configured with piping that connects or passes through each device.

18 is a connection between the gas-liquid separator 9 and the communication pipe 2 in the high-temperature regenerator 6
This is a high temperature regenerator solution tank connected at 0. 28 is a high-temperature regenerator solution discharge pipe related to a solution outflow channel from the high-temperature regenerator 6, and 41 is a part of a low-pressure solution circuit branched from the high-temperature regenerator solution tank 18 forming a part of the solution outflow channel. The bypass flow path 41 is connected to the solution tank 22 which forms a part of the main body, and the bypass flow path 41 is equipped with a float valve 19 .

The liquid refrigerant sprayed from the refrigerant liquid dispersion device 37 by the refrigerant #i ring pump 13 in the evaporator l takes heat from the cold water flowing through the cold water pipe 29, evaporates, and is guided to the absorber 2.

The liquid refrigerant that has not completely evaporated on the cold water pipe 29 is transferred to the evaporator 1.
The refrigerant receiver at the bottom of the evaporator 1 is stored in a tray 35 and circulated to the evaporator 1 by a refrigerant circulation pump 13.

The refrigerant vapor introduced into the absorber 2 is absorbed by a concentrated solution sprayed onto the cooling water pipe 30. The absorbed heat generated at this time is released into the cooling water flowing through the cooling water pipe 30. The dilute solution that has been diluted by absorbing refrigerant vapor in the absorber 2 is sent to the low-temperature heat exchanger 10 by the solution circulation pump 14, and then divided into three parts. The high temperature regenerator solution circulation pump 15 further pressurizes the check valve 16 . High temperature heat exchanger 12. The solution is supplied to the once-through boiler type high-temperature regenerator 6 via the high-temperature regenerator solution supply pipe 25.

The dilute solution flowing into the once-through exchanger 8 of the high temperature regenerator 6 is
It is heated by the combustion gas generated in the combustor 7 and boils.
The gas-liquid separator 9 separates the refrigerant into vapor and concentrated solution.

This concentrated solution is sent to the hot regeneration layer solution tank 18 through the hot regeneration layer solution discharge pipe 28 . The solution in the high-temperature regeneration disk solution tank 18 passes through a float valve 19 that controls the flow rate in response to the liquid level in the tank, and then flows into the bypass channel 41.
It passes through the high-temperature heat exchanger 12 and is sent to the solution tank 22 via a float valve 36 that controls the flow rate in response to the liquid level in the high-temperature regeneration plate solution tank 18.

Further, one of the remaining two parts of the dilute solution that exits the low-temperature heat exchanger 10 and is divided into three parts is transferred to the medium-temperature heat exchanger 11. Medium-temperature regeneration disk solution supply pipe 24, this medium-temperature regeneration disk solution supply pipe 24
The refrigerant vapor is guided to the medium-temperature regenerator 5 via the flow control valve 38 provided in the middle of the refrigerant, and is heated by the latent heat of condensation (medium-temperature regenerator heating pipe 31) of the refrigerant vapor generated in the high-temperature regenerator 6 to boil. and a concentrated solution. This concentrated solution was added to the mesophilic regenerator overflow weir 39. Medium temperature regenerator solution tank 40. Medium temperature regenerator solution discharge pipe 27. It is led to the solution tank 22 via the medium temperature heat exchanger 11.

In addition, the remaining one of the dilute solutions that exited the low-temperature heat exchanger 10 and was divided into three parts is supplied to the red C low-temperature regenerator 4 through the low-temperature regenerator solution supply pipe 23, and is generated in the medium-temperature regenerator 5. It is heated by the condensation latent heat of the refrigerant vapor (low-temperature regenerator latent heat heating tube 33) and the sensible heat of the refrigerant liquid generated in the high-temperature regenerator 6 and releasing the condensation latent heat in the medium-temperature regenerator 5 (low-temperature regenerator sensible heat heating tube 32). The liquid is boiled and separated into refrigerant vapor and a concentrated solution. This concentrated solution is led to the solution tank 22 via the low temperature regenerator solution discharge pipe 26.

Next, high temperature regenerator 6. Medium temperature regenerator5. A refrigerant is generated in the low-temperature regenerator 4, and the concentrated solution is collected in a solution tank 22, and is sprayed by a solution spray pump 17 into the solution tank 2, which is provided to prevent cavitation of this pump.
It is controlled by a flow rate control valve 21 that controls the flow rate in response to the liquid level of the absorber 2, and is dispersed into the absorber 2 via the low temperature heat exchanger 10.

On the other hand, the refrigerant vapor generated in the high-temperature regenerator 6 is sent to the medium-temperature regenerator 5, releases latent heat of condensation to the solution in the medium-temperature regenerator heating tube 31, liquefies it, and is further sent to the low-temperature regenerator 4. The liquid refrigerant sent to the low-temperature regenerator 4 releases sensible heat to the solution in the low-temperature regenerator sensible heat heating tube 32 and recovers the heat, then passes through the low-temperature heat exchanger 10 and is then transferred to the condenser 3. sent to.

In addition, the refrigerant vapor generated in the medium temperature regenerator 5 is sent to the low temperature regenerator 4, and after being liquefied by releasing latent heat of condensation to the solution in the low temperature regenerator latent heat heating tube 33, it is sent to the condenser 2 and cooled. It is cooled by cooling water flowing through the water pipe 30.

Next, the refrigerant vapor generated in the low-temperature regenerator 4 is sent to the condenser 3], and the latent heat of condensation is released into the cooling water flowing through the cooling water pipe 30, where it is condensed and liquefied. evaporator 1 together with refrigerant from the medium-temperature regenerator 5
sent to.

In the triple-effect absorption chiller having such a configuration, at startup, the pressure in the high-temperature regenerator 6 is low, so the flow tL of the solution from the high-temperature regenerator solution tank 18 to the solution tank 22 is difficult. The liquid level of the recycle disk solution tank 18 rises, and the flow 1 to valve 19 and the flow 1 to
The opening degree of the valve 36 increases. At this time, since the flow path resistance of the high temperature heat exchanger 12 is large, the amount of solution flowing through the bypass flow path 4 increases, and the amount of solution circulation is adjusted.

During steady operation, the pressure in the high-temperature regenerator 6 increases, the amount of solution flowing through the high-temperature heat exchanger 12 increases, and as a result, the liquid level in the high-temperature regenerator solution tank 18 decreases, causing the opening degrees of flow 1 to valve 19 to decrease. is constricted, and the amount of solution flowing through the bypass channel 41 is almost eliminated.

At this time, the opening degree of the float valve 36 is still wide, and most of the solution flows through the high temperature heat exchanger 12.

Thereby, the heat transfer coefficient in the high-temperature heat exchanger 12 can be improved, and the high-temperature heat exchanger 12 can be made into a small boat.

Furthermore, in this embodiment, the float valve 36 is disposed on the downstream side of the high-temperature heat exchanger 12, and the solution passes through the float valve 36 after it has been cooled down to 100 degrees, so that flushing due to reduced pressure can be prevented. effective.

Furthermore, by preventing the flow l-valve 19 from being completely opened so that the ti-solution flows little by little through the bypass flow path 4-1 even during steady operation, crystallization of the solution in the bypass flow path 41 is prevented. There is also the additional effect of being able to achieve more.

In this embodiment, two float valves 19.36 are provided in the high-temperature regeneration solution tank 18 to control the flow rate, but a switching valve (not shown) such as a three-way valve is used to control the high-temperature regeneration solution. The solution from the panel solution tank 18 may be made to flow through the bypass channel 41 for a certain period of time at startup, and after the certain period of time, the switching valve may be switched to send the solution to the high temperature heat exchanger 12.

Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a cycle configuration diagram of a triple-effect absorption refrigerator according to another embodiment of the present invention. In the figure, the same reference numerals as in FIG. 1 are the same parts as in the previous embodiment. , the explanation thereof will be omitted.

In FIG. 2, reference numeral 42 denotes a bypass flow path, which connects the high temperature regenerator solution tank 18 and the medium temperature regenerator 5, and is equipped with a float valve 1.9.
The flowing solution is passed through the medium temperature regenerator 5 to the solution tank 22.
It is configured to send to.

In addition, the valve 36 to flow 1 is connected to the high temperature heat exchanger 12.
It is placed on the first stream side.

The rest of the structure and operation are similar to the embodiment shown in FIG. 1 described above.

According to the embodiment shown in FIG. 2, which is grown four times in this way, in addition to achieving the main effects described in the example shown in FIG. 5, this has the effect of shortening the startup time of this medium temperature regenerator 5.

In addition, since the float valve 36 installed in the high-temperature regenerator solution tank 18 is placed upstream of the high-temperature heat exchanger 12, the high-temperature heat exchanger Another advantage is that it is possible to prevent loss due to mixing of the high-temperature solution in the high-temperature regenerator liquid level tank 18 with the solution that has been cooled in the vessel 12 and has a lower temperature.

Next, still another embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a cycle configuration diagram of a dual-effect absorption refrigerator according to yet another embodiment of the present invention. In the figure, the same reference numerals as in FIG. because there is,
The explanation will be omitted.

In FIG. 3, reference numeral 43 denotes a bypass flow path, which connects the high temperature regeneration plate solution tank 18 and the low temperature regenerator 4, and is equipped with a float valve 19 to regenerate the solution flowing through the bypass flow path 43 at low temperature during startup. The solution is configured to be sent to the solution tank 22 via the container 4.

The rest of the structure and operation are similar to the embodiment shown in FIG. 1 described above.

According to the embodiment of FIG. 3 configured in this way, the first
In addition to achieving the main effects described in the illustrated embodiment,
At startup, the high-temperature solution is sent to the low-temperature regenerator 4 through the bypass channel 43, which has the effect of shortening the startup time of the low-temperature 1T1 generator 4.

In addition, if the bypass flow path 43 is branched and connected to the medium temperature regenerator 5 and the low temperature regenerator 4, the medium temperature regenerator 5 and the low temperature regenerator 4 can be connected to each other.
In both cases, it is also possible to shorten the startup time.

Next, still another embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a cycle configuration diagram of a triple-effect absorption refrigerator according to still another embodiment of the present invention. In the figure, the same reference numerals as in FIG. Therefore, its explanation will be omitted.

In FIG. 4, 41' is the high temperature regenerator solution tank 18.
and a bypass flow path connecting the solution tank 22 and the solution tank 22;
46 is a solenoid valve provided in the bypass passage 41', and 46 is a solenoid valve 45 provided in response to the liquid level height of the high temperature regenerator solution tank
This is a liquid level switch that activates the

In the embodiment shown in FIG. 4, a solenoid valve 45 is provided in place of the float valve in the middle of the bypass flow wr41', and this solenoid valve 45 is opened and closed by a liquid level switch 46 installed in the high temperature regenerator solution tank 18. The other structure and operation are the same as the embodiment shown in FIG. 1 described above.

In the embodiment shown in FIG. 4 configured in this way, the pressure in the high temperature regenerator 6 is low at the time of startup, so the high temperature regenerator solution tank 18
Since it is difficult for the solution to flow from the solution tank 22 to the solution tank 22, the liquid level in the high temperature regenerator solution tank 18 rises, and the liquid level switch 46 is activated to open the solenoid valve 45 and increase the opening degree of the float valve 36. However, the flow path that passes through the float valve 36 via the high-temperature heat exchanger 12 has a large flow resistance, so the solution does not flow much, and most of the solution passes through the bypass flow path 41 and the solenoid valve 45 into the solution tank 22. sent to.

On the other hand, during steady operation, the pressure in the high-temperature regenerator 6 increases, so the solution also flows to the high-temperature heat exchanger 12, which has a large flow resistance, and the liquid level in the high-temperature regenerator solution tank 18 decreases. The surface switch 46 is activated and the bypass flow path 41 is opened.
' Close the solenoid valve 45.

Even when the electromagnetic valve 45 is closed, the solution flows little by little, thereby preventing crystallization in the bypass channel 41'. When the liquid level in the high temperature regenerator solution tank 18 falls and the liquid level switch 4G operates to close the solenoid valve 45, the opening degree of the float valve 36 is still sufficiently large and the pressure in the high temperature regenerator 6 is also high. Therefore, the solution is sent to the solution tank 22 via the high temperature heat exchanger 12 which has a large flow resistance. Then, the subsequent flow rate of the solution is regulated by a float valve 36 that responds to the liquid level height of the high temperature regenerator solution tank 18. Thereby, the heat transfer coefficient in the high-temperature heat exchanger 12 can be improved, and the high-temperature heat exchanger 12 can be downsized.

Next, still another embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a cycle configuration diagram of a triple-effect absorption refrigerator according to still another embodiment of the present invention, and in the figure, the same reference numerals as in FIGS. Since it is the same part as the example, I will briefly explain it.

In Fig. 5, 50 is a high temperature heat exchanger with low pressure loss;
The dilute solution flowing into the once-through type heat exchanger 1 in the high-temperature regenerator 6 and the concentrated solution flowing out from the gas-liquid separator 9 in the high-temperature regenerator 6 are heat exchanged, and the gas-liquid separator 9 and the high-temperature regenerator Solution tank] This is a heat exchanger with low pressure loss that is driven only by the rad difference of 8, and is installed in the high temperature regenerator solution discharge pipe 28 related to the solution outflow path from the high temperature regenerator 6. be.

The rest of the structure and operation are similar to the embodiment shown in FIG. 4 above.

The embodiment of FIG. 5 having such a configuration achieves the main effects described in the previous embodiment of FIG. This has the advantage of reducing heat loss. In addition, since the solution temperature in the high temperature regenerator solution tank 18 decreases,
Flushing due to pressure reduction at the float valve 36 can be prevented, and since the float valve 36 installed in the high temperature recycler solution tank 18 is placed on the upstream side of the high temperature heat exchanger 12, it is possible to prevent flushing due to pressure reduction at the float valve 36. This also has the effect of preventing damage caused by the high temperature solution in the high temperature regenerator solution tank 18 mixing with the solution that has been cooled down to a low temperature by the high temperature heat exchanger 12 due to leakage of the float valve 36. .

Next, still another embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a cycle configuration diagram of a triple-effect absorption refrigerator according to yet another embodiment of the present invention. In the figure, the same reference numerals as in FIG. Therefore, its explanation will be omitted.

In FIG. 6, 6A is a high-temperature regenerator in the form of a tube boiler, and 18A is a high-temperature regenerated hot solution tank that is integrated with the high-temperature regenerator via a solution overflow weir 47. 44
is a bypass flow path related to the solution outflow flow path from the high temperature regenerator 6A, which connects the high temperature regeneration hot solution tank 18 and the solution tank 22.

A float valve 19 is provided.

The concentrated solution of the high temperature regenerator 6A overflows from the solution overflow weir 47 and communicates with the high temperature regenerated hot solution tank 18A, and is configured to be sent to the bypass channel 44 by the action of the flow 1 to valve 19 at the time of startup. .

42 is a heat exchanger disposed in the bypass flow path 44,
It exchanges heat with the dilute solution sent from the high-temperature heat exchanger 12 to the high-temperature regenerator 6A via the high-temperature regenerator solution supply pipe 25.

28' is a high temperature regenerator solution discharge pipe, which is configured to send the solution in the high temperature regeneration hot solution tank 18A to the high temperature heat exchanger 12 after adjusting the droplet amount with a float valve 36.

The rest of the structure and operation are the same as the embodiment shown in FIG. 1 above.

According to the embodiment shown in FIG. 6 having such a configuration, as in each of the embodiments described above, the solution circulation amount of the high temperature regenerator 6A can be appropriately controlled both during startup at low pressure and during steady operation at high pressure. In addition to increasing the heat transfer coefficient of the high-temperature heat exchanger 12, since the heat exchanger 51 is provided to recover heat from the bypass passage 44, it is possible to further save energy.

In each of the above-mentioned embodiments, an example of a triple-effect absorption refrigerating machine has been described, but the present invention is not limited to this, and the present invention can be applied to general-purpose absorption refrigerating equipment within the range of multiple-effect absorption refrigerating equipment that can be expected to have the same effect. It is something.

Furthermore, in each of the above embodiments, the dilute solution is supplied in parallel to three regenerators, one for high temperature, one for medium temperature, and one for low temperature.
Even in a configuration in which the solution is supplied in series, for example, in a configuration in which the solution is supplied in parallel to each high-temperature and medium-temperature regenerator, and a low-temperature regenerator is supplied in series from the high-temperature regenerator, the present invention has the same effect. It is something that demonstrates the. .

Further, in each of the embodiments shown in FIGS. 1 to 5, an example of an absorption refrigerator in which the high-temperature regenerator uses a once-through boiler has been described, but the present invention is not limited to this. The same effect can be expected by using a water tube boiler or a smoke tube boiler.

〔Effect of the invention〕

As described above, according to the present invention, the amount of solution circulated in the high-temperature regenerator can be appropriately controlled both at low-pressure start-up and during high-pressure steady operation, and at the same time, the amount of solution circulated in the high-temperature heat exchanger can be controlled appropriately. It is possible to provide a multi-effect absorption refrigerating device that can improve the transfer rate and downsize the high-temperature heat exchanger.

[Brief explanation of the drawing]

FIG. 1 is a cycle configuration diagram of a triple-effect absorption refrigerating machine according to an embodiment of the present invention, and FIG. 2 is a cycle configuration diagram of a triple-effect absorption refrigerating machine according to another embodiment of the present invention. 3 is a cycle configuration diagram of a triple-effect absorption refrigerator according to yet another embodiment of the present invention, and FIG. 4.5.6 is a cycle configuration diagram of a triple-effect absorption refrigerator according to still another embodiment of the present invention. It is a cycle block diagram of a type|formula refrigerator.

Claims (1)

[Claims] 1. A high-temperature regenerator that uses an external heat source as a heating source, and refrigerant vapor generated in the high-temperature regenerator as a heating source for a solution in a subsequent low-temperature regenerator, respectively, to generate refrigerant vapor. In a multi-effect absorption refrigeration system comprising a plurality of regenerators, a condenser, an evaporator, an absorber, a solution heat exchanger, etc., and piping connecting the operating equipment of these absorption cycles, The solution outflow flow path is branched, and one side is connected to a solution heat exchanger, and the other side is connected to a bypass flow path that connects to a low-pressure solution circuit including each regenerator and absorber downstream of the high-temperature regenerator. A multi-effect absorption refrigerating device, characterized in that a control means for controlling a solution flow rate is disposed in the bypass channel. 2. In the device described in claim 1, the control means for controlling the solution flow rate disposed in the bypass flow path is a solenoid valve, and the solenoid valve is opened and closed according to the liquid level height of the high temperature regenerator. A multi-effect absorption refrigerating device that is linked to a liquid level switch installed in the solution tank of the high temperature regenerator. 3. In the device described in claim 1, the control means for controlling the solution flow rate disposed in the bypass flow path is a float valve, and the opening degree of the float valve is adjusted according to the liquid level height of the high temperature regenerator. A multi-effect absorption refrigeration system that is configured to change the 4. In the solution according to claim 1, a dilute solution containing a large amount of refrigerant flowing into the high-temperature regenerator and a dilute solution containing a low refrigerant flowing out from the high-temperature regenerator are arranged in the solution outflow path from the high-temperature regenerator. A high-temperature heat exchanger with a low pressure loss capable of exchanging heat with a concentrated solution is installed, and the concentrated solution flowing out from the high-temperature regenerator is branched after passing through the high-temperature heat exchanger with a low pressure loss. Multi-effect absorption refrigeration equipment.