JP3159402B2 - Operation switching method and adsorption medium heating and cooling medium supply mechanism in adsorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation switching method in an adsorption refrigerator for generating chilled water for air conditioning and factory processes, and a heating medium supply mechanism for adsorbent heating and cooling. .

[0002]

2. Description of the Related Art Most of adsorption chillers currently used include two systems of adsorption reactors having a solid adsorbent such as silica gel, zeolite and activated carbon, and a heat exchange unit for heating and cooling the solid adsorbent. Further, a common condenser and an evaporator are provided. The heat medium flow paths passing through the heat exchange sections of the adsorption reactors of the respective systems are configured to be selectively connected to the heat medium supply paths connected to the heating source and the cooling source by switching valve mechanisms, respectively. Is operated so that the adsorption and desorption reactions are alternately performed by switching the operation. That is, while the refrigerant vapor is being adsorbed by the adsorbent of the adsorption reactor of one system, the adsorbent is regenerated, that is, desorbed by flowing hot water as a heat medium for regeneration into the adsorbent heat exchanger of the other side. The operation is switched so that cold water is generated by alternately repeating the batch cycle of performing the above.

[0003] At this time, the heat exchange section of the adsorption-type reactor for performing the adsorption reaction is connected to a heat medium supply path connected to a cooling source by 30 mm.
Cooling water of about ℃ removes heat of adsorption, and regeneration of the adsorbent is performed by desorption reaction. In the adsorption type reactor, hot water of about 80 ℃ flows from the heating medium supply path connected to the heating source for regeneration. Supply heat. In the adsorption reactor in which the desorption reaction has been performed in this manner, heat is accumulated in the heat storage agent itself, constituent materials, and the like, while the other adsorption reactor is maintained at a relatively low temperature.

In such a state, the heat medium supply path is switched as it is, and cooling water is supplied to the heat exchange section of the adsorption type reactor in which the desorption reaction has been performed, and the other side of the adsorption type reaction path is used. In the operation switching method of supplying hot water to the reactor, the heat loss is large and the thermal efficiency is low.

[0005] In order to solve such a problem, conventionally,
For example, attempts have been made to recover heat by the following operation switching method.

[0006] First, prior to the switching of operation, from the outgoing side of the cooling water supply path to the heat exchange section of the adsorption type reactor in which the desorption reaction has been performed, and then to the adsorption reaction The hot water remaining in the heat exchange section of the adsorption reactor where the desorption reaction has been performed up to the return side of the cooling water supply path via the heat exchange section of the adsorption reactor where Is removed by cooling water and transferred to a heat exchange section of the adsorption reactor on the other side where the adsorption reaction has been performed, and is subjected to preheating. (See JP-A-64-58966)

In the second method, prior to the switching of operation, the adsorption reaction is performed from the heat exchange section of the adsorption reactor in which the desorption reaction has been performed, and then the adsorption reaction has been performed. A heat medium path is formed, which passes through the heat exchange section of the adsorption reactor and the cooling source in order, and returns to the heat exchange section of the adsorption reactor where the desorption reaction has been performed, and the desorption reaction has been performed until then. The hot water remaining in the heat exchange section of the adsorption reactor is driven out by the cooling water and returned to the heat source, and the cooling water remaining in the heat exchange section of the adsorption reactor in which the adsorption reaction has been performed is heated water. It is a method of driving out and returning to a cooling source. (See JP-A-63-46356)

[0008]

However, these methods have the following problems. In any method, the amount of heat recovered from the adsorption reactor in which the desorption reaction has been carried out up to that point is only the amount of heat of the hot water itself remaining in the heat exchange section,
The amount of heat stored in the adsorbent and the constituent materials cannot be recovered at all. In either method, the transport of warm water from the heat exchange section of the adsorption reactor where the desorption reaction has been performed up to that point is driven out by the cooling water, so the supply time of the cooling water must be controlled appropriately. If the time is too short, the recovery will be insufficient, and if the time is too long, the cooling water used to drive out the hot water will enter the heat exchange section of the adsorption reactor to supply the hot water. Or is supplied to a heat source. Further, even if the supply time of the cooling water is properly controlled, mixing of the hot water and the cooling water to be transported cannot be avoided, so that efficient heat transport cannot be performed. An object of the present invention is to solve such a problem.

[0009]

In order to solve the above-mentioned problems, first, in the present invention, two or more adsorption-type reactors each including a solid adsorbent and a heat exchange unit for heating and cooling the solid adsorbent are provided. The heat medium flow paths passing through the heat exchange sections of the adsorption reactors of the respective systems are configured to be selectively connected to the heat medium supply paths connected to the heating source and the cooling source by switching valve mechanisms, respectively. In the adsorption type refrigerator configured to alternately perform the adsorption and desorption reactions by switching the operation of the heating type reactor, at the time of switching the operation, each heat medium flow path is separated from the heating source and the cooling source. The present invention proposes an operation switching method in which a heat medium circulating path is formed temporarily in series with the heat medium to circulate the heat medium, and the circulated heat medium transports heat in the adsorption reactor through the heat exchange unit. .

Next, the present invention provides, as an apparatus to which the above-mentioned method is applied, two or more adsorption adsorption reactors each containing a solid adsorbent and a heat exchange unit for heating and cooling the solid adsorbent. The heat medium flow path passing through the heat exchange section of the vessel is configured to be selectively connected to the heat medium supply path connected to the heating source and the cooling source by a switching valve mechanism, and the operation of the adsorption type reactor of each system is switched. In an adsorption refrigerator configured to alternately perform adsorption and desorption reactions, a heating source and a heating medium supply path connected to a cooling source are provided between a going side and a returning side of a heating medium supply path.
A heat exchanger comprising a bypass path provided with a switching valve, a circulation path between a going side and a return side between the bypass path and the switching valve mechanism, and a circulation pump installed on at least one side of the circulation path. A medium supply mechanism is proposed.

In the heat medium supply mechanism, the circulation pump may be provided with an idling path provided with a switching valve, and this idling path may be constituted by the circulation path.

[0012]

When the operation medium is switched and a heat medium circulation path is formed to circulate the heat medium, the heat medium exchanges heat in the heat exchange sections of the respective adsorption reactors, and the desorption reaction is performed until then. The heat of the adsorption reactor being carried out is transferred to the adsorption reactor in which the adsorption reaction has been carried out. As described above, since the heat medium is circulated, heat exchange is performed continuously, and therefore, the amount of heat transferred is that of hot water in the heat exchange section of the adsorption reactor in which the desorption reaction has been performed. Not only the amount of heat but also the amount of heat stored in the adsorbent and the constituent materials is included, and strict control of the operation time is unnecessary.
Further, since the heat medium circulation path is separated from the heating source and the cooling source, the above-described heat recovery can be performed without being affected by the heat medium from these.

[0013] The heat medium circulation path is connected to a heat medium supply path which is selectively connected to a heat medium circulation path through a heat exchange section of each of the adsorption type reactors via a switching valve mechanism, and a circulation pump. If the circulation pump is provided with an idling path and the idling operation is performed even when the above-described heat medium circulation path is not formed, the load on the circulation pump can be reduced. Can be reduced.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a system explanatory view showing a configuration of a heating medium supply mechanism for heating and cooling an adsorbent in an adsorption refrigerator to which the present invention is applied, and constitutes an adsorption refrigerator such as an evaporator or a condenser. Other components are not shown.

In the figures, reference numerals 1a and 1b denote two adsorption reactors, and 2a and 2b denote respective adsorption reactors 1a and 1b.
3 shows a heat exchange unit built in b. The adsorbent contained in the adsorption reactors 1a and 1b is not shown. Reference numerals 3a and 3b denote heat medium flow paths passing through the respective heat exchange sections 2a and 2b, and these heat medium flow paths 3a and 3b.
b is configured to be selectively connected to a heating medium supply path connected to a heating source (not shown) and a cooling source (not shown) by the switching valve mechanisms 4 and 5 arranged on both the upstream side and the downstream side, respectively. . That is, reference numeral 6a denotes a heating heat medium supply path connected to a heating source (not shown), and 6b denotes a cooling source (not shown).
The heating heat medium supply path 6a is connected to the upstream and downstream sides of the heat medium flow paths 3a and 3b via switching valves 4a and 5a, respectively, and is connected to the cooling medium supply path. The heat medium supply path 6b is connected to the switching valve 4b,
5b, they are connected to the upstream and downstream sides of the heat medium flow paths 3a, 3b.

The symbol i indicates the forward side of the heat medium supply paths 6a and 6b, that is, the side where the heat medium such as hot water and cooling water flows from the heating source and the cooling source, and o indicates the heat medium supply paths 6a and 6b.
, That is, the side on which the heat medium flows out to the heating source and the cooling source. A bypass path 8a provided with switching valves 7i, 7o is provided between the outgoing side i and the return side o of the heat medium supply path 6a connected to the heating source, and is connected to the outgoing side i of the heat medium supply path 6b connected to the cooling source. A bypass path 8b provided with switching valves 9i and 9o is provided between the return side o.

The heat medium supply paths 6a and 6b are connected to the bypass paths 8a and 8b and the switching valve mechanisms 4 and 5 respectively.
A circulation path 10a between the outgoing side i and the returning side o
10b. And the circulation path 10 on one side
A circulation pump 11 is installed at a.

A circulation pump 11 is connected to the circulation path 10a.
The switching valves 12u and 12l are provided on the upstream side and the downstream side, respectively, to form an idling path 13 passing through these switching valves 12u and 12l. In the figure, the circulation path 10b
Are provided with a pair of switching valves 14u and 14l corresponding to the switching valves 12u and 12l, respectively.
u, 14u, bypass path 1 between switching valves 12l, 14l
5u, 15l are provided to constitute the idling path 13. The idling path 13 may be configured by providing a bypass path 16 between the switching valves 12u and 12l as shown by a two-dot chain line in the figure.

Next, the operation of the above configuration will be described.
First, FIG. 1 shows an operation state in which an adsorption reaction is performed on the adsorption type reactor 2a side and a desorption reaction is performed on the adsorption type reactor 2b side. Hot water as a heat medium from a heating source is shown in FIG. As indicated by a solid line arrow, the heat medium passes through the switching valve 7i, passes through the outgoing side i of the heat medium supply path 6a, and flows from the switching valve 4a into the heat medium flow path 3b. Then, the heat flows through the heat exchange section 2b of the adsorption type reactor 1b through the heat medium flow path 3b to give heat for the desorption reaction to the adsorbent, and then is switched from the return valve o of the switching valve 5a and the heat medium supply path 6a. Reflux to the heating source via valve 7o. On the other hand, as shown by a two-dot chain line in the figure, the cooling water from the cooling source passes through the switching valve 9i, passes through the outgoing side i of the heating medium supply path 6b, and flows from the switching valve 4b to the heating medium. It flows into the route 3a. Then, it flows through the heat exchange section 2a of the adsorption-type reactor 2a through the heat medium flow path 3a to take away heat generated in the adsorbent during the adsorption reaction, and then from the switching valve 5b and the return side o of the heat medium supply path 6b. It is returned to the cooling source via the switching valve 9o.

In this operation, the circulation pump 11 is also operated. The heat medium driven by the circulation pump 11 flows into the bypass path 15u via the switching valve 12u on the discharge side of the circulation pump 11, and Thereafter, the switching valve 1 is sequentially changed.
4u, the circulation path 10b, the switching valve 14l, the bypass path 15l, and the return to the suction side of the circulation pump 11 in the circulation path 10a via the switching valve 12l, and the circulation is repeated. Therefore, the circulation pump 11 performs an idling operation.

In the above operation, after a predetermined time has passed,
When switching the operation, first, prior to the predetermined switching, the switching valves 7i, 7 related to the heat medium supply paths 6a, 6b.
o; 9i, 9o and the switching operation of the switching valves 12u, 12l; 14u, 14l related to the idling path 13 and the switching operation of one of the switching valves of the switching valve mechanisms 4, 5; . For example, the switching valve 5a of the switching valve mechanism 5,
FIG. 2 shows a case in which the switching operation of 5b is performed, and FIG. 3 shows a case in which the switching valves 4a and 4b of the switching valve mechanism 4 are switched.

When the above switching operation of the switching valve is performed, the hot water and the cooling water from the heating source and the cooling source flow into the bypass paths 8a and 8b from the switching valves 7i and 9i on the outgoing side i, respectively, and are switched to the switching valve 7o. , 9o and return to the heating source and the cooling source by bypassing to the return side o.

In the operation shown in FIG. 2, water as a heat medium discharged from the circulation pump 11 is
0a, and flows into the heat medium flow path 3b via the switching valves 12u and 4a. Then, the water flowing through the heat exchange section 2b of the adsorption type reactor 2b through the heat medium flow path 3b reaches the switching valve mechanism 5 which has performed the switching operation, and this time the switching valve 5b
Through the circulation path 10b. This water flows through the circulation path 10b, and flows into the heat medium flow path 3a via the switching valves 141 and 14u and the switching valve 4b of the switching valve mechanism 4. Then, the water flowing through the heat exchange section 2a of the adsorption reactor 2a through the heat medium flow path 3a reaches the switching valve mechanism 5 that has performed the switching operation, and this time passes through the switching valve 5a to the circulation path 10a. Inflow. Then, this water flows through the circulation path 10a and returns to the suction side of the circulation pump 11 via the switching valve 12l.

In the operation shown in FIG. 3, unlike the flow shown in FIG. 2, the water discharged from the circulation pump 11 passes through the respective switching valves as shown by arrows in FIG.
After passing through a, circulation is performed through the heat medium flow path 3b.

In any of the operations described above, the heating medium distribution paths 3a and 3b corresponding to the adsorption-type reactors 1a and 1b of the respective systems are disconnected while the heating source and the cooling source are separated from each other. A heat medium circulation path passing in series is configured.
Therefore, the water flowing through this heat medium circulation path is
In the above, the adsorption reactor 1b in which the desorption reaction has been performed and heat is taken from the adsorption reactor 1b in which heat is stored in the adsorbent and the constituent materials has been taken, and the adsorption reaction has been performed so far.
Transport to Then, in the heat exchanging section 2a, the adsorbent and the constituent materials of the adsorption reactor 1a are preheated, and the heat is effectively used. In such an operation, strict control of the operation time is impossible, and an appropriate time setting of, for example, about 1 minute may be performed.

When the predetermined circulation operation time has elapsed in this way, the switching valves 7i, 7o; 9i, 9o relating to the heat medium supply paths 6a, 6b and the switching valves 12u, 12l relating to the idling path 13; The switching operation of the switching valves 14u and 14l is performed, and the switching operation of either one of the switching valve mechanisms 4 and 5 is performed. For example, in the operation from the state of FIG. 2, the switching valves 4a and 4b of the switching valve mechanism 4 are switched, and
In the operation from the state of FIG. 3, the switching valve 5a of the switching valve mechanism 5,
5b is switched. That is, the switching valve of the switching valve mechanism that is not the switching valve mechanism switched when switching from the normal operation to the circulation operation is operated.

FIG. 4 shows the state switched from the state shown in FIG. 2 in this manner. In this state, the hot water from the heating source is supplied to the heat medium flow path 3a of the adsorption type reactor 1a.
1 only in that the cooling water from the cooling source flows through the heat medium flow path 3b of the adsorption reactor 1b this time, and the idling operation of the circulation pump 11 is the same as in the state of FIG. Done.

If the operation is continued by the idling path 13 even during the normal operation in which the circulation pump 11 is not used as described above, the circulation operation can be started quickly only by switching the switching valve, and compared with the intermittent operation. As a result, the burden on the circulation pump can be greatly reduced.

Although the above embodiment shows an adsorption refrigerator having two adsorption reactors, the present invention relates to an adsorption refrigerator having three or more adsorption reactors to increase the COP. Needless to say, the present invention can be applied to a refrigerator, that is, a so-called cascade type adsorption refrigerator.

[0030]

As described above, the present invention has the following effects. Efficiently recovers and effectively uses not only the heat of the hot water remaining in the heat exchange section of the adsorption reactor where the desorption reaction has been performed, but also the heat stored in the adsorbent and components. And the thermal efficiency can be improved. Operation switching control is easy. By providing an idling path corresponding to the circulation pump for performing the above-described heat recovery, the load on the circulation pump can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a system explanatory diagram showing a configuration of a heating medium supply mechanism for heating and cooling an adsorbent in an adsorption refrigerator to which the present invention is applied.

FIG. 2 is a system explanatory diagram showing a configuration of a heating medium supply mechanism for heating and cooling an adsorbent in an adsorption refrigerator to which the present invention is applied, in an operation state shifted from the operation state shown in FIG. 1; is there.

FIG. 3 is a system diagram showing a configuration of a heat medium supply mechanism for heating and cooling an adsorbent in an adsorption type refrigerator to which the present invention is applied in another operation state shifted from the operation state shown in FIG. 1; FIG.

FIG. 4 is a system explanatory diagram showing a configuration of a heating medium supply mechanism for heating and cooling an adsorbent in an adsorption refrigerator to which the present invention is applied, in an operation state shifted from the operation state shown in FIG. 2; is there.

[Explanation of symbols]

 1a, 1b Adsorption type reactor 2a, 2b Heat exchange section 3a, 3b Heat medium flow path 4, 5 Switching valve mechanism 4a, 4b; 5a, 5b Switching valve 6a, 6b Heat medium supply path 7i, 7o; 9i, 9o Switching Valve 8a, 8b Bypass path 10a, 10b Circulation path 11 Circulation pump 12u, 12l Switching valve 13 Idling path 14u, 14l Switching valve 15u, 15l Bypass path 16 Bypass path

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F25B 17/08 F25B 17/12

Claims (4)

(57) [Claims] 1. A system comprising at least two adsorption reactors each containing a solid adsorbent and a heat exchange section for heating and cooling the solid adsorbent, and a heat medium flow passage passing through the heat exchange sections of the respective adsorption adsorption reactors. Is configured to be selectively connected to a heating medium supply path connected to a heating source and a cooling source by a switching valve mechanism, respectively, so that adsorption and desorption reactions of the respective adsorption systems of the respective systems are alternately performed by operation switching. In the configured adsorption refrigerator, when the operation is switched, the heat medium is circulated by temporarily configuring the heat medium circulation paths that pass through the respective heat medium circulation paths in series with the heating source and the cooling source disconnected. Circulating and transferring heat in the adsorption reactor through the heat exchange section by the circulating heat medium. 2. A heat medium flow path passing through the heat exchange section of each of the adsorption reactors provided with at least two adsorption reactors each including a solid adsorbent and a heat exchange section for heating and cooling the solid adsorbent. Is configured to be selectively connected to a heating medium supply path connected to a heating source and a cooling source by a switching valve mechanism, respectively, so that adsorption and desorption reactions of the respective adsorption systems of the respective systems are alternately performed by operation switching. In the configured adsorption refrigerator, a bypass valve provided with a switching valve is provided between the going side and the returning side of each heating medium supply path connected to the heating source and the cooling source, and the bypass path and the switching valve are provided. A circulation path is formed between the outgoing side and the return side between the mechanisms, and a circulating pump is installed on at least one side of the circulating path, for adsorbent heating and cooling in an adsorption refrigerator. Heat medium supply mechanism 3. A heating medium supply mechanism for heating and cooling an adsorbent in an adsorption refrigerator, wherein the circulation pump according to claim 2 is provided with an idling path provided with a switching valve. 4. A heating medium supply mechanism for heating and cooling an adsorbent in an adsorption type refrigerator, wherein the idling path according to claim 3 is constituted by the circulation path according to claim 2.