JP2000304385A - Absorption type hot and chilled water generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent various type evils due to a solid material, sludge in a refrigerant circulating line by providing a foreign matter capturing mechanism in the line for condensing and passing a vapor refrigerant generated in a regenerator. SOLUTION: In the absorption hot and chiller water generator 10, a solution circulating system or a solution circulating line is constituted of a dilute solution line L10 communicating with a high temperature regenerator 14 through an absorber 12, an intermediate concentration solution line L12 for supplying an intermediate concentration solution heated and concentrated by the regenerator 14 to a low-temperature regenerator 16, and a high concentration line L14 for returning the concentration solution further heated and concentrated by the regenerator 16. A foreign matter capturing mechanism 8 constituted of two stages of a relatively rough filter or trap 4 and a relatively fine filter or trap 6 is provided at the line L4 for constituting a solution circulating line. Thus, a solid material or a sludge mixed in the circulating line of the generator 10 can be effectively removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption chiller / heater, and more particularly to an improvement in a refrigerant circulation line of the absorption chiller / heater.

[0002]

2. Description of the Related Art For example, in an absorption chiller / heater using water as a refrigerant and an aqueous solution of lithium bromide as an absorption solution, since lithium bromide as a salt exerts a corrosive action, iron or iron is added to the solution circulation line. Solids or sludge containing copper as a main component may be generated. Solids and sludge are mainly generated in a high-temperature regenerator in which a solution is heated to a high-temperature atmosphere.

[0003] The presence of such solid matter and sludge causes damage to various devices interposed in the solution circulation line and also causes blockage of the solution circulation line. In order to remove the above-mentioned solids and sludge, in the prior art,
For example, as disclosed in Japanese Patent Application Laid-Open No. 9-152219, there has been proposed an absorption chiller / heater provided with a filter or trap for removing solids and sludge in a solution circulation line.

[0004] However, as a result of various studies or analyzes performed by the inventors, the above-mentioned solids and sludge are generated not only in the solution circulation line but also in the refrigerant circulation line in the absorption chiller / heater. It turned out to be. The conventional absorption chiller / heater manufactured under the precondition that “solid matter and sludge are generated only in the absorption solution circulation system (solution circulation line)” should be dealt with at all. Can not do.

[0005] Therefore, in the conventional absorption chiller / heater, the distribution pipe of the refrigerant in the refrigerant circulation line is blocked by the solids or sludge, or the solids or sludge adheres to the surface of the heat transfer pipe to improve the heat transfer performance. There is a possibility of lowering it. Further, there is a possibility that various devices interposed in the refrigerant circulation line may be damaged by solids and sludge generated in the refrigerant circulation line. Further, the presence of solids and sludge in the refrigerant circulation line causes a problem that the performance of the refrigerant pump for adding a head necessary for circulating the liquid-phase refrigerant is deteriorated.

On the other hand, in the prior art, in addition to the above-mentioned technology, a corrosion inhibitor is formed on a solution circulation line by a corrosion inhibitor to protect piping systems and various devices from a highly corrosive aqueous solution of lithium bromide. Thus, the generation of solids and sludge itself is suppressed. However, in order to form a film with a corrosion inhibitor, the ambient temperature must be somewhat high, but the temperature of the refrigerant circulation line is much lower than that of the solution circulation line, and the refrigerant has a corrosion inhibitor. Cannot exist. Therefore, it is very difficult to form a film for corrosion prevention on the refrigerant circulation line.

That is, there is a problem that the conventional technology cannot cope with the new fact that "solids and sludge are also generated in the refrigerant circulation line, so that it is necessary to cope with them".

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned prior art, and various types of solids and sludge in a refrigerant circulation line which could not be dealt with by the prior art. The purpose of the present invention is to provide an absorption chiller / heater that can prevent adverse effects.

[0009]

According to the present invention, there is provided an absorption chiller / heater having a regenerator heated at a high temperature, wherein the refrigerant vapor generated in the regenerator is condensed and flows. In addition, a foreign matter capturing mechanism is interposed. (FIGS. 1 to 10)

According to the present invention having such a configuration, while the liquid-phase refrigerant is circulating, the solid matter or sludge generated by corrosion or the like is removed by the foreign matter capturing mechanism (for example, a filter or a trap). Therefore, the refrigerant circulation line (for example, the spray pipe) is prevented from being blocked, and the cooling efficiency does not decrease due to solids or sludge adhering to the surface of the chilled water line. Further, the performance of the pump interposed in the refrigerant circulation line is prevented from lowering.

In practicing the present invention, the foreign matter capturing mechanism is connected to a refrigerant line in which the liquid-phase refrigerant that has not been vaporized in the evaporator is recirculated, and is connected to a refrigerant line communicating with a spray pipe in the evaporator. It is preferred that it is provided. (FIGS. 1, 2, 4, 5, and 10)

Preferably, the foreign matter capturing mechanism has a liquid phase refrigerant flowing therein and is interposed in a refrigerant line communicating the condenser and the evaporator. (FIG. 3, FIG. 6 to FIG. 9)

Normally, solids or sludge in the refrigerant circulation line is first generated in the high-temperature regenerator and moves to the evaporator via the refrigerant system. Therefore, if a foreign substance capturing mechanism is provided in the refrigerant line, solid matter or sludge generated in the high-temperature regenerator is reliably removed on the upstream side of the evaporator.
Therefore, various adverse effects due to the presence of solids or sludge can be eliminated.

Further, in the present invention, a branch line is provided in a refrigerant line in which a liquid-phase refrigerant not vaporized in the evaporator is recirculated, the refrigerant line being connected to a spray pipe in the evaporator. It is preferable that the foreign matter capturing mechanism is interposed in the line, and a low pressure maintaining valve is interposed in the upstream and downstream of the foreign matter capturing mechanism in the branch line. (FIGS. 4 and 5)

In the present invention, the liquid-phase refrigerant flows therein and the refrigerant line connecting the condenser and the evaporator is provided with the foreign matter capturing mechanism, and the branch line is provided upstream of the foreign matter capturing mechanism in the branch line. Preferably, a low pressure maintaining valve is interposed on the downstream side and the downstream side. (FIGS. 6 to 9)

By interposing the foreign matter capturing mechanism in the branch line, when the foreign matter capturing mechanism is closed, the valve is opened and closed so that the refrigerant does not flow through the branch line.
At this time, the upstream and downstream sides of the foreign matter capturing mechanism are closed by the valve to maintain a low pressure (or vacuum pressure) inside the refrigerant circulation line or the piping system of the absorption chiller / heater. Then, the foreign matter capturing mechanism may be removed, and the closed portion may be cleaned, foreign matter and sludge may be removed and discarded, and other necessary maintenance may be performed.

In addition to the above, according to the present invention, the foreign substance capturing mechanism is constituted by arranging a plurality of types of foreign substance capturing means (for example, a fine filter or trap, a coarse filter or trap) in series, and Is preferably arranged on the upstream side, and fine foreign matter capturing means is arranged on the downstream side. (FIGS. 8 to 10)

Since the corrosion product generated when air is mixed into the system of the absorption chiller / heater has large particles, such a corrosion product having a large size is used as a filter or trap formed of, for example, a hollow fiber membrane filter or the like. When passing through the fine foreign matter capturing means as described above, the resistance is large and clogging occurs. On the other hand, a plurality of types of foreign matter capturing means are arranged in series, and if the coarse foreign matter capturing means is arranged on the upstream side, a large corrosion product of particles generated at the time of air mixing becomes upstream. It is removed by the located coarse foreign matter capturing means. As a result, the size of the filter can be reduced, the frequency of backwashing can be reduced, and clogging of fine filters can be prevented.

According to the present invention, there is provided an absorption chiller / heater having a regenerator heated at a high temperature.
A foreign matter capturing mechanism configured by arranging a plurality of types of foreign matter capturing means in series is interposed. In the foreign matter capturing mechanism, a coarse foreign matter capturing means is arranged on the upstream side, and a fine foreign matter capturing means is arranged on the downstream side. It is also possible to configure as described. (Fig. 1)

[0020]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, similar members are denoted by similar reference numerals.

In FIG. 1, an absorption chiller / heater generally designated by the reference numeral 10 includes a dilute solution line L10 connecting the absorber 12 and the high-temperature regenerator 14, and an intermediate-concentration solution heated and concentrated by the high-temperature regenerator 14. And a high concentration line L for returning the high concentration solution further heated and concentrated by the low temperature regenerator 16 to the absorber 12.
14 constitute a solution circulation system or a solution circulation line. The high concentration line L14 constituting the solution circulation line is provided with a relatively coarse filter or trap 4 and a foreign matter capturing mechanism 8 composed of two stages of a relatively fine filter or trap 6. This mechanism 8
Will be described later.

The refrigerant vapor generated in the high-temperature regenerator 14 flows through the vapor line L16 and flows into the condenser 18 via the low-temperature regenerator 16. When passing through the low-temperature regenerator 16,
Since the solution is heated by the amount of heat held by the refrigerant vapor flowing through the vapor line L16, the refrigerant vapor is generated from the low-temperature regenerator 16. The refrigerant vapor flows into the condenser 18 via the vapor line L18.

The liquid-phase refrigerant condensed in the condenser 18 is supplied to the evaporator 20 via the refrigerant line L20. Then, the latent heat is removed from the cold water flowing through the cold water line L22 communicating with the evaporator 20, and the cold water becomes refrigerant vapor. Evaporator 20
The refrigerant vaporized in the above returns to the absorber 12 via the vapor line L24A.

In the evaporator 20, the liquid-phase refrigerant that has not been vaporized drops from the spray pipe 26 in the evaporator 20 via the refrigerant line L24. At this time, the head is loaded by the refrigerant pump 28 and flows through the line L24. here,
Steam line L16, L18, L24A and refrigerant line L
20 and L24 constitute a refrigerant circulation system (refrigerant circulation line). In FIG. 1, reference numeral L30 denotes a cooling water line, and the cooling water flowing in the cooling water line L30 causes the absorption heat generated in the absorber 12 and the condenser 18
Is discharged out of the absorption chiller / heater 10.

Here, in the embodiment of FIG. 1, in the refrigerant line L24 constituting the refrigerant circulation line, a region between the evaporator 20 and the refrigerant pump 28, in other words, the refrigerant pump 28 in the refrigerant line L24. Is provided with a filter or trap 30-1 which is a foreign matter capturing mechanism. This filter or trap 30-1
Is not particularly limited as long as it can remove solids and sludge generated by corrosion or the like in the refrigerant circulation line.

In the embodiment shown in FIG. 1, a hollow fiber membrane filter (for example, manufactured by Kuraray, trade name: M-3100P-S) is used as the filter or trap as the foreign matter capturing mechanism.
U), synthetic resin filter (for example, manufactured by Yuasa: trade name Y
P-40B) and the like are preferred. However, the present invention is not limited to this.
It is also possible to use a magnetic filter, activated carbon or the like.

In the embodiment shown in FIG. 1 having such a configuration, while the liquid-phase refrigerant is circulating through (evaporating from) the evaporator 20, the refrigerant line L24, and the spray pipe 26, the filter or trap 30-1 is formed. Thereby, solid matter and sludge generated due to corrosion and the like are removed. For this reason, there is no possibility that the spray pipe 26 will be blocked, and it is also possible to prevent the solids and sludge from adhering to the surface of the cold water line L22 and lowering the cooling efficiency. Further, the performance of the refrigerant pump 28 is prevented from deteriorating.

Although the absorption chiller / heater 10 shown in FIG. 1 is of a so-called "series flow" type, the present invention is not limited to this. So-called "parallel flow" type, "reverse flow" type, "series parallel flow" type, "reverse parallel flow" type absorption chiller / heater, just like the absorption chiller / heater of FIG. The present invention is applicable. In this connection, only the condenser 18, the evaporator 20 and the lines communicating therewith are shown in FIG. 2 et seq.

FIG. 2 shows a second embodiment of the present invention. FIG.
In the first embodiment, the foreign matter capturing mechanism (filter or trap) 30-1 is provided in a region of the refrigerant line L24 on the upstream side of the refrigerant pump 28. On the other hand, in the second embodiment of FIG. 2, the filter or trap (foreign matter capturing mechanism) indicated by reference numeral 30-2 is provided in the refrigerant line L24 in a region downstream of the refrigerant pump 28.

With respect to other configurations and operational effects, the second embodiment shown in FIG. 2 is the same as the embodiment shown in FIG.

In the third embodiment of the present invention shown in FIG. 3, a filter or trap 30-3 is interposed in a refrigerant line L20 through which the refrigerant condensed in the condenser 18 flows.

Experiments conducted by the inventors have confirmed that the high-temperature regenerator 14 (FIG. 1) normally generates the largest amount of solids or sludge such as magnetite (Fe ₃ O ₄ ). I have. At the same time, experiments conducted by the inventors have confirmed that magnetite fine particles adhered to the spray tube 26 in the evaporator 20. From the facts confirmed in these experiments, magnetite (Fe
It is presumed that solid matter or sludge such as ₃ O ₄ ) is first generated in the high-temperature regenerator 14 and moves to the evaporator 20 via the vapor line L16, the condenser 18, and the refrigerant line L20.

Therefore, if a foreign matter capturing mechanism (filter or trap) 30-3 is provided in the refrigerant line L20, solid matter such as magnetite or sludge generated in the high-temperature regenerator 14 will be generated on the upstream side of the evaporator 20 ( The filter or trap 30-3) ensures removal. In other words, by providing a filter or trap 30-3 in the refrigerant line L20 as in the third embodiment of FIG. 3, solids or sludge can be reliably removed, and the presence of solids or sludge Can also eliminate various adverse effects.

The other structure, operation and effect of the embodiment shown in FIG. 3 are the same as those of the embodiment of FIG. 1 or the embodiment of FIG.

FIG. 4 shows a fourth embodiment of the present invention. In the first embodiment shown in FIG. 1, the filter or trap 30-1 serving as the foreign matter capturing mechanism is connected to the refrigerant line L24.
Is disposed in a region on the upstream side of the refrigerant pump 28 in FIG. On the other hand, in the fourth embodiment shown in FIG. 4, the branch line L32 branches and joins from the region of the refrigerant line L24 on the upstream side of the refrigerant pump 28, and the filter or the trap 30- is connected to the branch line L32. 4 (foreign matter capturing mechanism) is provided. And the branch line L
At 32, valves 32 and 34 are provided before and after the filter or trap 30-4, respectively. On the other hand, the valve 3 is also provided in a region (refrigerant line) L34 of the refrigerant line L24 bypassing the branch line L32.
6 are interposed.

In other words, in the embodiment of FIG. 4, the refrigerant line L bypasses the filter or trap 30-4.
34 are provided. Normally, the valve 36
Is closed and the valves 32 and 34 are opened to remove solid matter or sludge mixed in the liquid-phase refrigerant flowing through the refrigerant line L24 into the filter or trap 30-4.
To remove. However, after a long period of time, solids or sludge mixed in the refrigerant will block the filter or trap 30-4. In such a case, the valve 36 is opened to allow the liquid refrigerant to flow through the bypass line L34. Then, in order to maintain the low pressure (or vacuum pressure) of the refrigerant circulation line, the valves 32 and 34 are closed, and then the filter or trap 3 is closed.
Perform necessary maintenance by removing 0-4.

Here, the filter or trap 30-4
If it is not necessary to perform the maintenance (normal time), the valve 36 is opened so that only a part of the liquid-phase refrigerant flowing through the refrigerant line L24 passes through the filter or the trap 30-4. The effect of removing the object or sludge is exhibited.

In the embodiment of FIG. 4, the configuration and operation and effect other than those described above are the same as those of the embodiment of FIGS.
In particular, it is the same as the embodiment of FIG.

FIG. 5 shows a fifth embodiment of the present invention. FIG.
In the fourth embodiment, the foreign matter capturing mechanism (filter or trap) 30-4 is interposed in the branch line L32 located upstream of the refrigerant pump 28 in the refrigerant line L24. On the other hand, in the fifth embodiment of FIG. 5, a filter or trap (foreign matter capturing mechanism) indicated by reference numeral 30-5 is interposed in the branch line L36 located downstream of the refrigerant pump 28 in the refrigerant line L24. Have been.
A refrigerant line (or a region in the line L24) that bypasses the branch line L36 is indicated by a symbol L38 in FIG.

Other configurations and operational effects are the same as those of the fifth embodiment shown in FIG. 5 and the first embodiment shown in FIGS.

FIG. 6 shows a sixth embodiment of the present invention. In the sixth embodiment, a branch line L40 that branches from a refrigerant line L20 that connects the condenser 18 and the evaporator 20 and joins is provided, and valves 32 and 34, a filter or a trap 30-6 are provided therein. ing. At the same time, the refrigerant line L42 bypassing the branch line L20
Is provided with a valve 36. In the sixth embodiment shown in FIG. 6, the valve 36 may be a valve for adjusting a flow rate.

The other structures, functions and effects of the sixth embodiment are the same as those of the embodiment of FIGS. 1 to 5, particularly the embodiments of FIGS. 3, 4 and 5.

In the seventh embodiment shown in FIG. 7, a pump 40 is provided immediately downstream of a filter or trap 30-6 in a branch line L40 in the sixth embodiment. Other configurations and operations are the same as those of the seventh embodiment and the sixth embodiment.

FIG. 8 shows an eighth embodiment of the present invention. In the embodiment of FIGS. 1 to 7, only a fine filter or trap is used as the foreign matter capturing mechanism. On the other hand, in the eighth embodiment, in the refrigerant line L20 connecting the condenser 18 and the evaporator 20, a fine filter or a coarse filter is provided upstream of the branch line L40 provided with the trap 30-6. 44 are interposed.

Since the corrosion products generated when air enters the system of the absorption chiller / heater have large particles, for example, a filter or trap 30-6 composed of a hollow fiber membrane filter or the like is used.
When a corrosion product tries to pass through the filter 30-6, the resistance is large and the filter 30-6 is easily clogged. On the other hand, in the eighth embodiment shown in FIG. 8, a large corrosion product of particles generated at the time of air mixing is removed by the coarse filter 44 located on the upstream side. That is, the fine filter (or trap) 30-6 and the coarse filter 44
By installing the filter in a so-called “double”, it is possible to achieve a reduction in the size of the filter, a reduction in the frequency of backwashing, and prevention of clogging in a fine filter.

In the ninth embodiment of the present invention shown in FIG. 9, a pump 46 is provided immediately downstream of the coarse filter 44. In FIG. 9, reference numerals 48 and 50 indicate valves. Other configurations and operational effects are the same as those of the embodiment of FIGS. 1 to 8, particularly the embodiment of FIG.

8 and 9, the coarse filter 4
4 is a refrigerant line L connecting the condenser 18 and the evaporator 20
20, but as shown in FIG.
The refrigerant pump 28 of the refrigerant line L24 for circulating the refrigerant
A coarse filter 44 may be provided in the vicinity. In FIG. 10, reference numerals 48 and 50 indicate valves. A fine filter (or trap) is provided downstream of the coarse filter 44.
Illustration of the fine filter is omitted.

Referring again to FIG. 1, as described above, the coarse filter 4 and the fine filter 6 are interposed in the high-density line L14, and the two-stage filters 4 and 6 constitute the foreign matter capturing mechanism 8. ing. In the case where air is mixed into the circulation system of the absorption chiller / heater 10 and large solids or sludge is formed, first, large foreign matters (solids and sludge) are removed by the coarse filter 4. Then, foreign matter not captured by the coarse filter 4 is removed by the fine filter 6. As a result, the disadvantages caused by the conventional technique of interposing only the fine filter in the solution circulation system, such as breakage and clogging of the fine filter due to large foreign matter, are eliminated.

An embodiment in which the absorption solution circulation system in FIG. 1 is modified is shown in FIG. High concentration line L14
Is branched into solution lines L14-1 and L14-2 in a region between the low-temperature solution heat exchanger 62 and the absorber 12, and merges on the side close to the absorber 12. A coarse filter 4 and a fine filter 6 are interposed in the solution line L14-2. The two-stage filters 4 and 6 constitute a foreign matter capturing mechanism 8. A valve 36 is interposed in the solution line L14-1 that bypasses the foreign matter capturing mechanism 8. When air is mixed into the circulation system of the absorption chiller 10 to form large solids or sludge, first of all, in FIG. ) Is removed, and foreign matter not captured by the coarse filter 4 is removed by the fine filter 6. As a result, the disadvantages caused by the conventional technique of interposing only the fine filter in the solution circulation system, such as breakage and clogging of the fine filter due to large foreign matter, are eliminated. FIG.
In 1, reference numeral 64 indicates a high-temperature solution heat exchanger. The configuration and operation and effect other than the foreign matter capturing mechanism interposed in the solution circulation system of the embodiment shown in FIG. 11 are the same as those of the embodiment shown in FIG.

It should be noted that the embodiment shown in FIGS. 1 to 11 is merely an example, and is not intended to limit the technical scope of the present invention.

[0051]

The effects of the present invention are listed below. (1) Magnetite and other solids and sludge mixed in the refrigerant circulation line of the absorption chiller / heater can be reliably removed. (2) As a result, various inconveniences caused by the presence of the solid matter and the sludge can be solved. (3) The foreign matter capturing mechanism (filter or trap)
By interposing in the branch line of the refrigerant line constituting the refrigerant circulation line, it is possible to cope with the case where the foreign matter capturing mechanism is blocked by the solid matter or the sludge. Alternatively, the refrigerant can be purified in an operating state. (4) By providing a valve in the branch line, it is possible to maintain a low pressure (or a vacuum pressure) of the refrigerant circulation mechanism during maintenance of the foreign matter capturing mechanism. (5) By arranging the coarse filter and the fine filter in series, it is possible to cope with a case where a large-sized solid or sludge is generated due to air mixing in the circulation system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a sixth embodiment of the present invention.

FIG. 7 is a block diagram showing a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing an eighth embodiment of the present invention.

FIG. 9 is a block diagram showing a ninth embodiment of the present invention.

FIG. 10 is a block diagram showing a tenth embodiment of the present invention.

FIG. 11 is a block diagram showing another embodiment of the present invention.

[Explanation of symbols]

4, 44: coarse filter (or trap) 6: fine filter (or trap) 8, 30-1, 30-2, 30-3, 30-4, 30-
5, 30-6: Foreign matter capturing mechanism 10: Absorption chiller / heater 12: Absorber 14: High temperature regenerator 16: Low temperature regenerator 18: Condenser 20: Evaporation Vessel 26 ... Spray tube 28, 40, 46 ... Refrigerant pump 32, 34, 36, 48, 50 ... Valve L10, L12, L14 ... Solution line L16, L18, L24, L24A ... Steam line L22 ・ ・ ・ Cooled water line L30 ・ ・ ・ Cooled water line

Claims (7)

[Claims] 1. An absorption chiller / heater having a regenerator heated at a high temperature, wherein a foreign matter capturing mechanism is interposed in a refrigerant circulation line through which refrigerant vapor generated in the regenerator condenses and flows. Absorption chiller / heater. 2. The foreign matter capturing mechanism is a refrigerant line in which a liquid-phase refrigerant not vaporized in an evaporator is recirculated, and is interposed in a refrigerant line communicating with a spray pipe in the evaporator. The absorption chiller / heater of claim 1. 3. The absorption chiller / heater according to claim 1, wherein the foreign matter capturing mechanism is provided with a refrigerant line in which a liquid-phase refrigerant flows and which communicates with a condenser and an evaporator. 4. A refrigerant line in which a liquid-phase refrigerant not vaporized in an evaporator is recirculated, wherein a branch line is provided in a refrigerant line communicating with a spray pipe in the evaporator, and the foreign matter is provided in the branch line. The absorption chiller / heater according to any one of claims 1 and 2, wherein a trapping mechanism is provided, and a valve for maintaining a low pressure is provided upstream and downstream of the foreign matter capturing mechanism in the branch line. 5. A refrigerant line in which a liquid-phase refrigerant flows and which communicates with a condenser and an evaporator, is provided with the foreign matter capturing mechanism, and is upstream and downstream of the foreign matter capturing mechanism of the branch line. The absorption chiller / heater according to any one of claims 1 and 3, wherein a valve for maintaining low pressure is interposed in the water heater. 6. The foreign matter capturing mechanism is configured by arranging a plurality of types of foreign matter capturing means in series, a coarse foreign matter capturing means is arranged on the upstream side, and a fine foreign matter capturing means is arranged on the downstream side. The absorption chiller / heater according to claim 1. 7. An absorption chiller / heater having a regenerator heated at a high temperature, wherein a plurality of types of foreign matter capturing means are provided in a solution circulation line which connects the regenerator and the absorber and circulates an absorbing solution therein. Are arranged in series, and a foreign matter capturing mechanism is provided, in which the coarse foreign matter capturing means is arranged on the upstream side and the fine foreign matter capturing means is arranged on the downstream side. And absorption chiller / heater.