JP3030235B2 - Absorption chiller and method of operation at startup - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption chiller and an operation method at the time of starting the absorption chiller, and more particularly, to facilitate the operation of the absorption chiller at the time of startup and greatly reduce the possibility of damage to the equipment. The present invention relates to an absorption refrigerator and an operation method at the time of startup.

[0002]

2. Description of the Related Art Absorption refrigerators using water as a refrigerant and a highly hygroscopic substance such as an aqueous solution of lithium bromide as an absorption solution are known. FIG. 9 is a system flow chart for explaining the operation principle of the single-effect absorption refrigerator. The refrigerant vapor generated in the evaporator E is absorbed in the absorption solution (eg, lithium bromide aqueous solution) in the absorber A, and the refrigerant is absorbed. The absorption solution diluted by the above is sent to the regenerator G by the solution pump SP1. The regenerator G has a burner B. The diluted absorption solution evaporates the refrigerant by heating from the burner B, is concentrated, and flows into the absorber A again. The vaporized refrigerant is condensed in the condenser C and sent to the evaporator E. In addition,
In the figure, RP is a refrigerant circulation pump that circulates the refrigerant in the evaporator E. HX is a heat exchanger for the absorbing solution, and exchanges heat between the low-temperature absorbing solution sent from the solution pump SP1 to the regenerator G and the high-temperature absorbing solution flowing from the regenerator G into the absorber A. By doing so, the thermal efficiency of the absorption refrigerator is improved. In the figure, S1 is a temperature sensor, and S2 is a level sensor.

In this absorption refrigerator, the absorption solution is supplied from the absorber A to the regenerator G by the solution pump SP as described above.
1, the inflow from the regenerator G to the absorber A is caused by the pressure difference between the internal pressure P _RVH of the regenerator G and the internal pressure P _{RVL of the} absorber A. For this reason, in the conventional absorption refrigerator, control at the time of startup is performed according to a sequence shown in FIG. As a procedure, the burner B is ignited (however, the solution pump SP1 is stopped).

[0004] The temperature of the absorbing solution in the regenerator G rises and exceeds a specified value (measured by the temperature sensor S1). Thereby, the internal pressure _PRVH in the regenerator G increases, and the absorbing solution flows due to the differential pressure. Due to the flow of the absorbing solution, the liquid level in the regenerator G becomes equal to or lower than the specified value (LH) (measured by the level sensor S2).

[0005] The solution pump SP1 is started. The solution pump SP1 is not started until a certain pressure difference is generated between the regenerator G and the absorber A. FIG. 11 is a system flow chart for explaining the operation principle of the double effect absorption refrigerator. In this case, a high temperature regenerator HG and a low temperature regenerator LG are used as regenerators, and the high temperature regenerator HG flows out. The absorbing solution flows into the low-temperature regenerator LG, where it exchanges heat with the refrigerant vapor from the high-temperature regenerator HG, and then flows into the absorber A. In this case, the diluted absorption solution from the solution pump SP1 is combined with the heat-concentration absorption solution flowing out of the high-temperature regenerator HG and the high-temperature heat exchanger HX, and the heat-concentration absorption solution flowing out of the low-temperature regenerator LG. In the low-temperature heat exchanger LX,
By performing the heat exchange twice, and also in the low-temperature regenerator LG, the absorption solution is heated, so that high thermal efficiency can be achieved.

[0006] Also in this double effect absorption refrigerator, the absorption solution is pumped from the absorber A to the high temperature regenerator HG by the solution pump SP1 as described above.
G flows into the low-temperature regenerator LG due to the pressure difference between the internal pressure _PRVH of the high-temperature regenerator LG and the internal pressure _PRVM of the low-temperature regenerator LG. The internal pressure P _{RVM of the} G and the internal pressure P _{RVL of the} absorber A are generated by the differential pressure, and the control at the time of startup is performed by the sequence shown in FIG. 10 in the same manner as in the case of the single-effect absorption refrigerator. Done.

[0007]

The present inventors have been conducting continuous research and experiments on a regenerator used in the absorption refrigerator described above. The regenerator, in which the heat transfer tubes are arranged closer to the flame of the burner than those of the above, can make the combustion chamber compact and absorb the solution to the heat transfer tubes arranged closer to the burner. By devising the mode of feeding, corrosion and crystallization of the heat transfer tube caused by high heat flux (solvent such as water is excessively evaporated, and the amount of solute (absorbing solution) exceeds the solubility in the solvent. Low NO _x without causing the solute to precipitate as crystals).
He perceived that it was possible to obtain a regenerator capable of operating stably for a long period of time while achieving combustion and low unburned combustion, and filed an application as an improved regenerator.

FIGS. 1 and 2 show an example of such an improved regenerator for an absorption refrigerator. The regenerator A includes a side wall 11 of the main casing 1 and a heat transfer chamber 2 penetrating the main casing 1. An intermediate partition 31 is provided between the heat transfer chamber 2 and the upper wall 22 of the heat transfer chamber 2, that is, the upper end of the intermediate partition 31 reaches the inside of the upper absorbent solution reservoir 6. . In addition, the lower ends of the left and right intermediate partition walls 31 reach between the bottom plate 23 of the heat transfer chamber 2 and the bottom plate 12 of the main casing 1, that is, the lower absorbent solution reservoir 5,
It is connected by an intermediate bottom plate 33 having many holes 34. Accordingly, the lower absorbing solution reservoir 5 is divided into the first lower absorbing solution reservoir 5a and the second lower absorbing solution reservoir 5b by the intermediate bottom plate 33, and both are communicated by the hole 34 of the intermediate bottom plate 33.

On the downstream side of the heat transfer chamber 2, a number of heat transfer tubes 7 (first heat transfer tube group) are attached similarly to the conventional regenerator.
Lower absorption solution reservoir 5 (first lower absorption solution reservoir 5a)
A first absorption solution ascending flow path is formed which communicates with the upper absorption solution reservoir 6. On the upstream side of the first heat transfer tube group 7, that is, on the side close to the burner 3, a plurality of second heat transfer tube groups 71 constituting a second absorbing solution ascending flow path are provided. are arranged substantially vertically in the same manner as the lower end of the second tube bank 71 has reached the intermediate bottom plate 33.

On the back surface of the intermediate bottom plate 33 where the lower end opening of the second heat transfer tube group 71 is located, the lower end opening side of the second heat transfer tube group 71 is placed in the lower absorbent solution pool 5 (first).
Lower absorption solution reservoir 5a and second lower absorption solution reservoir 5
A rectangular frame 35 for isolating from the space b) is fixed, and a pipe 8 is connected to the bottom of the rectangular frame 35. The rectangular frame 35 functions as the absorbing solution inlet header in the present invention.

The shielding plate 3 is located above the upper absorbing solution reservoir 6 and above the second heat transfer tube group 71.
6 is fixed, and blocks upward scattering of the absorbing solution ejected from the upper opening of the second heat transfer tube group 71 as described later. The regenerator A for the absorption refrigerator is used in the same manner as the regenerator G shown in FIG. 9 or the high-temperature regenerator HG shown in FIG. That is, the absorption solution from the absorber A, which has been diluted by absorbing the refrigerant vapor, is sent from the pipe 8 into the rectangular frame 35 serving as an absorption solution inlet header by the solution pump SP1, and the burner 3
Is forcibly fed to the upper absorbent solution reservoir 6 through the second heat transfer tube group 71 constituting the second absorbent solution rising flow path arranged at a position close to the upper absorbent solution reservoir 6. While passing through the second heat transfer tube group 71, the absorbing solution is exposed to a strong heat flux, but the whole or a part of the absorbing solution pumped by the solution pump SP1 passes through the second heat transfer tube group 71. Therefore, the flow velocity is high, and the high heat flux is effectively absorbed, so that corrosion and crystallization do not occur in the heat transfer tube.

The absorbing solution spouted from the second heat transfer tube group 71 spreads over the entire surface of the upper absorbing solution reservoir 6 while being prevented from being scattered by the upper shielding plate 36, and is formed between the side wall 11 of the main casing 1 and the intermediate partition 31. It flows down the flow path (return flow path) between the first lower absorbent solution 5b and the second lower absorbent solution reservoir 5b, and then enters the first lower absorbent solution reservoir 5a through a number of holes 34 formed in the intermediate bottom plate 33. Then, from there, it passes through the first heat transfer tube group 7 constituting the first absorption solution ascending flow path and the flow path formed by the wall 21 and the intermediate partition 31 of the heat transfer chamber 2, and again, the upper absorption solution Return to pool 6.

During the forced convection of the absorbing solution to the second heat transfer tube 71 and the subsequent circulation by natural convection, the refrigerant (water) absorbed by the absorbing solution is vaporized by the heat from the burner 3,
The absorption solution concentrated by vaporization of the refrigerant is supplied from the pipe 9 to the absorber A (in the case of a double effect absorption refrigerator, the low-temperature regenerator L is used).
G to the absorber A) and again absorbs the refrigerant. On the other hand, the refrigerant vapor is sent to the condenser C.

According to the regenerator for an absorption refrigerator according to the above proposal, even if the heat transfer tubes 7 and 71 are arranged in almost the entire area inside the heat transfer chamber 2, the heat transfer tubes close to the burner as in the conventional regenerator. No corrosion or crystallization occurs in the heat tube 71. Therefore,
The entire regenerator having the same capability can be designed to be more compact than before, and there is no tendency to shorten the life. Furthermore, low NOx combustion becomes possible due to a decrease in flame temperature and a decrease in convection time in a high temperature field of combustion gas,
In addition, the generation of unburned components is also suppressed (Japanese Patent Application No. 7-1803).
No. 87 (Japanese Patent No. 2911103) .

The present inventors have continued experiments on the absorption refrigerator equipped with a regenerator with forced circulation of the absorption solution according to the above-mentioned proposal, and at the time of startup, the control as shown in FIG. When doing, I knew that there would be some inconvenience. That is, when the burner B is burned with the solution pump SP1 stopped at the time of startup, the absorption solution does not substantially flow in the second heat transfer tube 71 arranged close to the burner. The heat flux cannot be absorbed, and corrosion and crystallization in the heat transfer tube 71 may occur.

As a solution to this problem, when the solution pump SP1 is operated by operating it from the beginning, the pressure difference between the regenerator G and the absorber A (in the case of a single-effect absorption refrigerator) or high-temperature regeneration Pressure (in the case of a double-effect absorption refrigerator) between the low-temperature regenerator LG and the low-temperature regenerator LG and the low-temperature regenerator LG (in the case of the double-effect absorption refrigerator) is low.
There is a possibility that the amount of the absorbing solution in the absorber A becomes insufficient due to the insufficient flow of the absorbing solution into the absorber A, and cavitation may occur on the suction side of the solution pump SP1.

Accordingly, a main object of the present invention is to solve the above-mentioned disadvantages that can occur when the improved regenerator, which has already been proposed by the present applicant, is installed in an absorption refrigerator and started. That is, it is an object of the present invention to disclose an absorption refrigerator and an operation method at the time of startup thereof, which solve the possibility of corrosion and crystallization in a heat transfer tube and the possibility of cavitation in a solution pump. .

[0018]

One embodiment of an absorption refrigerator according to the present invention for solving the above-mentioned problems is a regenerator, for example, as shown in FIG. 1 and FIG. , A heat transfer tube having a heating burner and a number of heat exchange tube groups for heat exchange, and all or a part of the diluted absorbing solution fed from the solution pump is located in the vicinity of the burner of the heat transfer tube group. In an absorption refrigerator using a regenerator of a type that is forcibly fed into a regenerator only through a group, an absorption solution heated in the regenerator is used to remove the absorber from the regenerator. It is characterized in that an absorption solution circulation path for forcibly circulating the solution directly to the regenerator can be constructed.

[0019] In addition, the method for operating the absorption refrigerator according to the present invention at the time of startup for solving the above-mentioned problems is characterized in that at startup, the absorption solution heated by the regenerator is directly regenerated by passing through the absorber. It is operated while forced circulation to the vessel. The absorption refrigerator described in the present invention may be a single-effect absorption refrigerator or a double-effect absorption refrigerator. In the latter case, the present invention is applied to the high-temperature regenerator.

The absorption solution circulation path for returning the absorption solution heated by the regenerator directly from the regenerator to the regenerator via the absorber is provided by directing the absorption solution in the regenerator to the suction side of the solution pump. A part of the pipe may be constituted by a pipe which performs the operation. In this case, an on-off valve or a flow control valve is disposed in the pipe. In addition, a part of the pipe may be constituted by a pipe that short-circuits a pipe on the discharge side of the solution pump (a pipe for feeding the absorbing solution to the regenerator) and a pipe for outflow of the absorbing solution from the regenerator. Is provided with a second solution pump.

In the absorption refrigerator according to the present invention, at the time of startup, the absorption solution heated by the regenerator is forcibly circulated to the absorber directly through the absorption solution circulation path without passing through the absorber. . Therefore, a sufficient amount of the absorbing solution to absorb the heat flux can be supplied to the heat transfer tube group close to the burner receiving the high heat flux from the start. Thereby, the occurrence of corrosion and crystallization in the heat transfer tube group close to the burner at the time of startup is avoided.

When the absorption solution circulation path is constituted by a pipe for directly guiding the absorption solution in the regenerator to the suction side of the solution pump, a sufficient amount of the absorption solution is always sucked by the solution pump. No cavitation occurs in the pump. When the absorption solution circulation path is constituted by a pipe that short-circuits the discharge-side pipe of the solution pump and the absorption-solution outflow pipe from the regenerator, a sufficient amount of water is absorbed by the second solution pump provided in the pipe. Since the solution is sent to the heat transfer tube group that receives a high heat flux close to the burner, corrosion and crystallization occur in the heat transfer tube group even when the solution pump is stopped until a predetermined differential pressure rises. Never.

A predetermined pressure difference is generated between the regenerator and the absorber (in the case of a double effect absorption refrigerator, between the high temperature regenerator and the low temperature regenerator and between the low temperature regenerator and the absorber). At that point,
Alternatively, before and after that, the absorption solution circulation path is closed.
When operating by operating the second solution pump, the second
Is stopped, and the solution pump disposed between the absorber and the regenerator is operated.

Thereafter, the absorption chiller may be operated in the same manner as in the conventional case. The present invention is also applicable to a conventionally known absorption refrigerator as shown in FIG. 9 or FIG. 10, that is, an absorption refrigerator having a regenerator of a conventionally known type and a method of operating the same. . Even in such a case, it will be understood that the construction of the absorption solution circulation path according to the present invention can avoid the danger of heat damage to the regenerator and cavitation of the solution pump at startup.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an absorption refrigerator according to the present invention and a method of operating the absorption refrigerator at startup will be described in more detail with reference to the preferred embodiments shown in the drawings. FIG. 3 is a system flow diagram showing an embodiment of an absorption refrigerator according to the present invention. Basically, a conventionally known single-effect absorption refrigerator described above based on the system flow diagram shown in FIG. The same as the refrigerator, but the regenerator Ga used has a heating burner B and a large number of heat exchange heat transfer tube groups 7, 71 as shown in FIGS. And all or part of the diluted absorbing solution sent from the solution pump SP1 is forcibly sent into the regenerator Ga only through the heat transfer tube group 71 close to the burner of the heat transfer tube group. The difference is that it is of the type that is intended to be used. Therefore, other configurations of the single-effect absorption refrigerator are only given the same reference numerals in the drawings, and description thereof is omitted.

[0026] Then, in the single effect absorption refrigerating machine, and the suction side of the vicinity of the bottom of the regenerator Ga solution pump SP1 is connected by a pipe P, the piping P off valve V ₁ interposed Have been. Then, the absorption solution temperature in the regenerator Ga is measured by the sensor S1, the opening and closing valve V ₁ is being opened and closed by the temperature information. FIG. 4 is a sequence diagram showing a control state at the time of startup in the above absorption refrigerator. As a procedure, the solution pump SP1 for igniting the burner B is started.

The on-off valve V ₁ is opened. The temperature of the absorbing solution in the regenerator Ga becomes equal to or higher than the specified value (the internal pressure _PRVH in the regenerator Ga increases, and the flow of the absorbing solution starts due to the differential pressure). The opening and closing valve V ₁ is closed. Hereinafter, normal operation is performed.

The operation is performed as follows. According to this embodiment, the solution pump SP1 is activated simultaneously with the ignition of the burner B, but the vicinity of the bottom of the regenerator Ga and the suction side of the solution pump SP1 are connected by the pipe P, and the on-off valve V _{Since 1} is opened, no cavitation occurs in the solution pump SP1, and a sufficient amount of the absorbing solution is forcibly fed into the heat transfer tube group 71 close to the burner B of the regenerator Ga. Therefore, the occurrence of corrosion and crystallization in the heat transfer tube group 71 is also avoided. The temperature of the absorbent solution in the regenerator Ga becomes normal operation is on-off valve V ₁ was closed at the time has reached a predetermined temperature (the temperature at which the required pressure difference is obtained), the absorbent solution is absorbed by the differential pressure at that time The liquid has started flowing into the vessel A, and no cavitation occurs in the solution pump SP1.

In the above embodiment, an on-off valve is provided on the pipe P. However, a flow control valve can be used instead of the on-off valve. In that case, the set temperature of the absorbing solution in the regenerator Ga is set to 1 to n, and the closing amount (throttle amount) of the flow control valve is set to multiple stages as 1 to n according to the set temperature. Close the valve. In this case, the flow rate of the pipe P and the absorber A
Since the amount of water flowing into the engine can be changed stepwise, there is an advantage that the switching between the start-up operation and the steady operation can be smoothly performed.

FIG. 5 is a system flow diagram when the single-effect absorption refrigerator described with reference to FIGS. 3 and 4 and the operating method thereof are applied to a double-effect absorption refrigerator. Is the same as the previously known double-effect absorption refrigerator described above with reference to the system flow diagram shown in FIG. 11, but also in this case, the regenerator Ga used is the same as the heating burner B. Numerous heat exchange tube groups for heat exchange 7, 71
And all or a part of the diluted absorption solution sent from the solution pump SP1 is forcibly regenerated through only the heat transfer tube group 71 of the heat transfer tube group which is close to the burner. The type which is sent into Ga is used. Other configurations are the same as those shown in FIG.

[0031] In this double effect absorption refrigerating machine, and the suction side near the bottom and the solution pump SP1 regenerator Ga is connected by a pipe P, on-off valve V ₁ is is interposed the pipe P ing. Then, the absorption solution temperature in the regenerator Ga is measured by the sensor S1, the opening and closing valve V ₁ is being opened and closed by the temperature information. It can be easily understood that the operation method of the above absorption refrigerator at the time of startup is the same as that of the single effect absorption refrigerator shown in FIGS. 3 and 4.
In this case as well, it will also be understood that instead of the on-off valve V ₁ may use a flow control valve.

FIGS. 6 and 7 are system flow charts showing another embodiment of the absorption chiller and the operation method at the time of startup according to the present invention, and FIG. 8 is a diagram for explaining the sequence at the time of startup. is there. FIG. 6 shows a case where the present invention is applied to a single-effect absorption refrigerator, which is basically the same as the conventionally known single-effect absorption refrigerator described above based on the system flow diagram shown in FIG. Where the regenerator Ga used is
As shown in FIG. 1 and FIG. 2, an example thereof has a heating burner B and a number of heat exchange tube groups 7, 71, and the diluted absorption supplied from the solution pump SP1. The difference is that all or a part of the solution is of a type in which the solution is forcibly fed into the regenerator Ga only through the heat transfer tube group 71 close to the burner of the heat transfer tube group. ing. Therefore, also in this case, the other components of the single-effect absorption refrigerator are denoted by the same reference numerals in the drawings, and description thereof is omitted.

In the single-effect absorption refrigerator of this embodiment, the discharge-side pipe Pa of the solution pump SP1 (the pipe for sending the absorbing solution from the discharge side of the solution pump SP1 to the regenerator Ga) and the absorber from the regenerator Ga A is short-circuited with the absorption solution outflow pipe Pb to A by the pipe Ps.
Is provided with a second solution pump SP2. The suction side of the second solution pump SP2 is an absorption solution outflow pipe Pb, and the discharge side is a discharge side pipe Pa of the solution pump SP1.

The starting control state of the above absorption refrigerator is as follows. Ignite burner B. Activate second solution pump SP2. The temperature of the absorbing solution in the regenerator Ga becomes equal to or higher than the specified value (the internal pressure _PRVH in the regenerator Ga increases, and the flow of the absorbing solution starts due to the differential pressure).

[0035] The second solution pump SP2 is stopped. The solution pump SP1 is started. Perform normal operation. It is performed as. According to this embodiment, the second solution pump SP2 is activated at the same time as the ignition of the burner B, and the absorbing solution in the regenerator Ga passes through the absorbing solution circulation path, which is a short-circuit path passing through the second solution pump SP2. As a result, the gas is forcibly returned to the regenerator Ga through the heat transfer tube group 71 close to the burner B of the regenerator Ga. Therefore, the heat transfer tube group 71
The high heat flux in the interior is reliably absorbed by the circulating absorbent solution and corrosion and crystallization are avoided there. When the temperature of the absorbing solution in the regenerator Ga reaches a predetermined temperature (a temperature at which a necessary differential pressure can be obtained), the second solution pump SP2 is stopped, and the solution pump SP1 is started to operate normally. At that time, the absorbing solution is absorbed by the absorber A due to the differential pressure.
And cavitation does not occur in the solution pump SP1.

FIG. 7 is a system flow diagram in the case where the single-effect absorption refrigerator described with reference to FIG. 6 and the operating method thereof are applied to a double-effect absorption refrigerator. This is the same as the previously known double-effect absorption refrigerator described above with reference to the system flow diagram shown in FIG. 11, but also in this case, the high-temperature regenerator HGa used is composed of a plurality of heating burners B and Heat transfer tube groups 7 and 71 for heat exchange, and all or a part of the diluted absorption solution supplied from the solution pump SP1 is a heat transfer tube group close to a burner of the heat transfer tube group. A type that is forcibly fed into the regenerator Ga only through the line 71 is used. Other configurations are the same as those shown in FIG.

Also in this double effect absorption refrigerator, the discharge side pipe Pa of the solution pump SP1 and the absorption solution outflow pipe Pb from the regenerator Ga to the absorber A are short-circuited by the pipe Ps. Is provided with a second solution pump SP2. The suction side of the second solution pump SP2 is an absorption solution outflow pipe Pb, and the discharge side is a discharge side pipe Pa of the solution pump SP1.

It will be easily understood that the operation method of the above-mentioned double effect absorption refrigerator at the time of starting is the same as that of the single effect absorption refrigerator shown in FIG.

[0039]

According to the present invention, damage to the regenerator and occurrence of cavitation of the solution pump at the time of startup of the absorption refrigerator can be avoided, and the safety thereof can be improved. In particular, the regenerator has a heating burner and a number of heat exchange tubes for heat exchange, and all or a part of the diluted absorption solution sent from the solution pump is supplied to a burner of the heat transfer tubes. The present invention works effectively in the case where it is forcibly fed into the regenerator only through the adjacent heat transfer tube group.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a regenerator for an absorption refrigerator in which the present invention functions particularly effectively.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a system flow diagram illustrating an embodiment in which the present invention is applied to a single-effect absorption refrigerator.

FIG. 4 is a sequence chart showing a control state of an embodiment of the operation method of the absorption refrigerator according to the present invention.

FIG. 5 is a system flow diagram illustrating an embodiment in which the present invention is applied to a double-effect absorption refrigerator.

FIG. 6 is a system flow diagram illustrating another embodiment in which the present invention is applied to a single-effect absorption refrigerator.

FIG. 7 is a system flow diagram illustrating another embodiment in which the present invention is applied to a double effect absorption refrigerator.

FIG. 8 is a sequence chart showing a control state of another mode of the operation method of the absorption refrigerator according to the present invention.

FIG. 9 is a system flow diagram illustrating a conventional single-effect absorption refrigerator.

FIG. 10 is a sequence chart showing a control state of a conventional operation method of an absorption refrigerator.

FIG. 11 is a system flow diagram illustrating a conventional double-effect absorption refrigerator.

[Description of sign]

A: absorber, C: condenser, E: evaporator, Ga: regenerator,
SP1: solution pump, B: burner, S1: temperature sensor, S2: level sensor, P, Ps: piping, V ₁ : open / close valve, SP2: second solution pump

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masatoshi Asakawa 1-5-5 Minami-Otsuka, Toshima-ku, Tokyo (56) References JP-A-6-347121 (JP, A) JP-A-7-139845 (JP, A) JP-A-9-33136 (JP, A) JP-A-9-42800 (JP, A) (58) Fields studied (Int. Cl. ⁷ , DB name) F25B 15/00 306 F25B 33/00

Claims (2)

(57) [Claims] 1. An evaporator, an absorber, a regenerator, and a solution pump for absorbing a refrigerant vapor generated in the evaporator and feeding a diluted absorbing solution from the absorber to the regenerator.
An inflow pipe for allowing the absorbing solution heated and concentrated by the regenerator to flow into the absorber; and the regenerator further includes a heating burner and a plurality of heat exchange tubes for heat exchange. And all or a part of the diluted absorbing solution sent from the solution pump is forcibly fed into the regenerator through only the heat transfer tube group of the heat transfer tube group which is close to the burner. In such an absorption refrigerator, it is possible to construct an absorption solution circulation path for forcibly circulating the absorption solution heated by the regenerator directly from the regenerator to the regenerator via the absorber. An absorption refrigerator characterized by being made. 2. An evaporator, an absorber, a regenerator, and a solution pump for absorbing the refrigerant vapor generated in the evaporator and feeding a diluted absorption solution from the absorber to the regenerator.
The absorbent solution is heated and concentrated in said regenerator has an inlet pipe for introducing into the absorber, and further, before
The regenerator has a heating burner and a number of heat exchange tubes for heat exchange.
And the diluted suction supplied from the solution pump.
All or a part of the collected solution is a burner of the heat transfer tube group.
Forcibly into the regenerator only through the heat transfer tube group close to
This is a method of operating an absorption refrigerator that is to be immersed, and at the time of start-up, the absorption solution heated by the regenerator is forcibly circulated to the regenerator directly without passing through the absorber. Operating method at startup of the characteristic absorption refrigerator.