JPH1038402A - Steam-fired absorption chiller / heater - Google Patents

Abstract

(57) [Summary] [Problem] To remove cold water or hot water from an evaporator by operating a switching valve, and to return steam drain water of a heating source at a stable low temperature in both cold water removal and hot water removal. Provided is a steam-fired absorption-type water chiller / heater having a function of performing. SOLUTION: Refrigerant vapor generated by heating a dilute solution in a high-temperature regenerator 9 by high-temperature steam as a heating source is guided to an evaporator 1 through an on-off valve 19 to heat flowing hot water for heating. In the absorption chiller, the low-temperature dilute solution supplied from the absorber 5 to the high-temperature regenerator 9 exchanges heat with the steam drain in which high-temperature steam as a heating source is drained in the high-temperature regenerator 9. A drain cooler 20 is provided to recover heat to a temperature at which steam drain can be easily returned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam-fired absorption chiller / heater, and more particularly to a steam-fired absorption chiller / heater capable of cooling and heating, having a structure for taking out hot water from an evaporator.

[0002]

2. Description of the Related Art A technique described in Japanese Patent Publication No. 7-6709 is known as an absorption type chiller / heater having a structure for taking out hot water from an evaporator. The publication includes an evaporator, an absorber, a high-temperature regenerator, a low-temperature regenerator, a solution heat exchanger, a solution pump, a refrigerant pump, and a piping system operatively connecting these devices. In an absorption type chiller / heater which guides the hot water for heating by guiding it to an evaporator via an on-off valve and refluxes the concentrated solution obtained by the high temperature regenerator to the absorber, the discharge side of a refrigerant pump and the concentrated solution Is connected to the absorber through an on-off valve via an on-off valve, and the refrigerant liquid in the evaporator is supplied to the return concentrated solution from the regenerator before spraying to the absorber by a refrigerant pump to dilute the refrigerant liquid during heating. What has been disclosed is disclosed.

In the above-mentioned absorption type chiller / heater, the heating and cooling operation can be performed only by a simple valve operation. However, the absorption chiller / heater is a heating source for heating and diluting a dilute solution in the high temperature regenerator to separate refrigerant vapor. When a certain high temperature steam is drained in the high temperature regenerator, the steam drain temperature is high,
No consideration has been given to heat recovery of the steam drain to a temperature (about 90 ° C.) at which it can be easily returned.

In the multi-effect absorption type chiller / heater disclosed in Japanese Patent Application Laid-Open No. 56-110854, a heat exchanger for exchanging heat between a dilute solution sent from an absorber and exhaust gas is provided in an exhaust gas path of a regenerator. Which recovers the heat of the exhaust gas. However, there is no disclosure of recovering heat to a temperature (about 90 ° C.) in which high-temperature steam as a heating source is drained in a high-temperature regenerator and high-temperature steam drain is easily returned. Also, no consideration has been given to switching the valve during cooling and heating to discharge and return the high-temperature steam drain to a constant temperature (about 90 ° C.) at which it is easy to return the water.

In the absorption chiller / heater described in Japanese Patent Application Laid-Open No. 61-280355, a heat recovery device for recovering the exhaust heat of the high-temperature regenerator into refrigerant liquid or hot water during heating is provided by a heat source fluid flow path of the high-temperature regenerator. Are provided. But,
The high-temperature steam, which is the heating source, is drained in the high-temperature regenerator, and the temperature at which the high-temperature steam drain is easily returned (about 90 ° C)
C)). In addition, a constant temperature (about 90 ° C.) at which the high-temperature steam drain is easily returned by switching the valve during cooling and heating.
C), and no consideration was given to discharging and returning water.

[0006]

In a conventional absorption chiller / heater, high-temperature steam as a heating source must be drained and returned at a low and stable temperature (about 90 ° C.). At times, there is a problem that the steam drain temperature becomes high. In addition, since the temperature cannot be easily lowered, there is a problem in that live steam is generated and return water becomes difficult.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to remove cold or hot water from an evaporator by operating a switching valve. It is an object of the present invention to provide a steam-fired absorption chiller / heater having a function of returning steam drain water as a heating source at a stable low temperature at any time.

[0008]

According to a first aspect of the present invention, there is provided a steam-fired absorption chiller / heater according to the present invention, wherein a dilute solution is heated and concentrated to separate refrigerant vapor. A high-temperature regenerator and a low-temperature regenerator, a condenser for liquefying refrigerant vapor generated in these regenerators, an evaporator for evaporating the refrigerant by exchanging heat of the refrigerant liquid with a cold / hot water pipe on the load side, and an evaporator for the evaporator. An absorber for absorbing the refrigerant vapor generated in the above into the concentrated solution sent from the high-temperature regenerator and the low-temperature regenerator, and a piping system operatively connecting these devices, and a high-temperature heating source In the absorption refrigerator in which the refrigerant vapor generated by heating the dilute solution in the high-temperature regenerator by the vapor is guided to the evaporator through an on-off valve to heat the flowing hot water for heating, Low temperature supplied from the absorber to the high temperature regenerator A first drain cooler is provided for exchanging heat between the dilute solution and the high-temperature steam as the heating source, which is drained in the high-temperature regenerator, and recovers the steam drain to a temperature at which the steam drain is easily recirculated. It is like that.

In order to achieve the above object, a second aspect of the present invention according to the steam-fired absorption type chiller / heater of the present invention further comprises a load side chiller / heater in addition to the configuration of the first aspect. Provided a second drain cooler that exchanges heat between the hot water for circulation and the high-temperature steam as the heating source and the steam drain that has been drained in the high-temperature regenerator, and the first drain cooler and the second drain cooler are provided. A steam drain piping system having a switching valve for switching between a drain cooler and a drain cooler is connected between the first drain cooler and the second drain cooler.

Further, in order to achieve the above object, a third aspect of the present invention relates to a steam-fired absorption type chiller / heater of the present invention,
In addition to the configuration of the first aspect, a hot water bypass pipe is provided that bypasses a part of the heating hot water flowing through the load-side cold / hot water pipe with a switching valve, and one of the heating hot water flowing through the hot water bypass pipe is provided. Unit and a second drain cooler for exchanging heat between the high-temperature steam as the heating source and the steam drain that has been drained in the high-temperature regenerator, and switches between the first drain cooler and the second drain cooler. A steam drain piping system having a switching valve is connected between the first drain cooler and the second drain cooler.

The following is additional information. In the high-temperature regenerator, the refrigerant vapor generated from the solution by being heated by the high-temperature vapor enters the evaporator via the cooling / heating switching valve and heats the heating hot water. The concentrated solution of the high-temperature regenerator is returned to the absorber, diluted with the refrigerant liquid, and sent to the high-temperature regenerator by a solution pump. The high-temperature steam, which is the heating source, is drained in the high-temperature regenerator, and the steam drain exchanges heat with the dilute solution sent to the high-temperature regenerator to return water at a low temperature (about 90 ° C.). There is also a method in which the steam drain exchanges heat with the whole or a part of the hot water for heating by a switching valve.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a system diagram showing a heating cycle of a steam-fired absorption chiller / heater showing one embodiment of the present invention, and FIG. 2 is a heating cycle of a steam-fired absorption chiller / heater showing another embodiment of the present invention. FIG. 3 is a system diagram illustrating heat recovery of steam drain using hot water for heating in FIG.
FIG. 4 is a system diagram illustrating heat recovery of steam drain using a part of heating water for heating in a heating cycle of a steam-fired absorption chiller / heater according to another embodiment of the present invention. FIG. 2 is a system diagram showing a cooling cycle of the water-cooled water heater.

[Embodiment 1] FIGS. 4 and 1 have the same arrangement of equipment and different opening / closing of a switching valve. First, as a sequence of the description, the basic configuration of the steam-fired absorption chiller / heater will be described with reference to FIGS. 1 and 4, 1 is an evaporator, 2
Is a refrigerant spray pipe, 3 is a refrigerant pump, 4 is a cold / hot water pipe through which cold or hot water flows, 4a is an evaporator heat transfer pipe that guides the cold / hot water pipe 4 into the evaporator 1, 5 is an absorber, 6 is cooling A cooling water pipe through which water flows, 6a is an absorber heat transfer pipe that guides the cooling water pipe 6 into the absorber 5, 7 is a solution pump, 8 is a solution heat exchanger, 9 is a high temperature regenerator, 10 is a low temperature regenerator, 11 is
A heat source steam pipe 12 serving as a heat source for heating the dilute solution in the high-temperature regenerator 12 is a condenser.

Reference numeral 13 denotes a dilute solution pipe for sending the dilute solution from the absorber 5 to the high-temperature regenerator 9 via 13a and to a low-temperature regenerator 10 via 13b. Reference numeral 14 denotes a high-temperature solution via the concentrated solution pipe 14a. A solution spray pipe for returning the concentrated solution from the low-temperature regenerator 10 from the regenerator 9 to the absorber 5 via the concentrated solution pipe 14b, and a refrigerant vapor 15 generated by heating the dilute solution in the high-temperature regenerator 9 , A refrigerant vapor pipe for sending the refrigerant to the low temperature regenerator 10 and the like, 16
Is a refrigerant liquid pipe connecting the condenser 12 and the evaporator 1, and 17 is
A refrigerant pipe connecting the refrigerant spray pipe 2 and the solution spray pipe 14, a switching valve 18 provided in the refrigerant pipe 17, and a refrigerant vapor pipe 15a connecting the high temperature regenerator 9 and the evaporator 1 are provided. Switching valve.

Reference numeral 20 denotes a first drain cooler, which exchanges heat between a low-temperature dilute solution supplied from the absorber 5 to the high-temperature regenerator 9 and a vapor drain formed by the high-temperature heat source vapor and drained in the high-temperature regenerator 9. Things. Reference numeral 21 denotes a steam drain pipe for returning steam drained in the high-temperature regenerator 9 through the first drain cooler 20.

The cooling cycle of such a steam-fired absorption chiller / heater will be described with reference to FIG. During the cooling operation, the switching valves 18 and 19 are closed. The evaporator 1 is maintained at about one hundredth of the atmospheric pressure, and the refrigerant (water) therein is
The coolant pump 3 sprays the coolant through the coolant spray pipe 2 onto the evaporator heat transfer tube 4a through which the cold water flows. The coolant takes heat of the cold water and evaporates to produce a cooling effect. The evaporated refrigerant vapor flows into the absorber 5 kept at a low pressure by the cooling water,
Here, the solution spray pipe 14 absorbs the concentrated solution of the aqueous solution of lithium bromide sprayed onto the absorber heat transfer tube 6a, and the aqueous solution of lithium bromide becomes a dilute solution.

This dilute solution passes through a solution heat exchanger 8 by a solution pump 7 of a dilute solution pipe 13 and a part of the dilute solution pipe 13a.
To the high-temperature regenerator 9 and the remainder to the low-temperature regenerator 10 through the dilute solution pipe 13b. In the high-temperature regenerator 9, the dilute solution is heated by the high-temperature steam in the heat source steam pipe 11, and is separated into a refrigerant vapor and a strong solution. In the low-temperature regenerator 10, the dilute solution is heated by the refrigerant vapor generated in the high-temperature regenerator 9 and separated into the refrigerant vapor and the concentrated solution.

The concentrated solution thus concentrated is supplied from the high-temperature regenerator 9 to the low-temperature regenerator 10 through the concentrated solution pipe 14a.
After passing through the concentrated solution pipe 14b and the solution heat exchanger 8 again, it is sprayed on the absorber heat transfer pipe 6a in the absorber 5 by the solution spray pipe 14. The refrigerant liquid condensed by heating the dilute solution in the low-temperature regenerator 10 is guided to the condenser 12 by the refrigerant liquid pipe 15b. The refrigerant vapor generated in the low-temperature regenerator 10 is condensed in the condenser 12. The condensed refrigerant thus formed is guided to the evaporator 1 by the refrigerant liquid pipe 16 and sprayed, and goes through a cycle.

On the other hand, the drain of the high-temperature heat source vapor condensed by heating and condensing the dilute solution in the high-temperature regenerator 9 flows through the vapor drain pipe 21, and is fed into the dilute solution pipe 13 a sent to the high-temperature regenerator 9 by the solution pump 7. Heat is exchanged by the drain cooler 20 with the dilute solution (all or part) sent to the low temperature regenerator 10 or the low temperature (about 90 ° C.) and returned.

Next, a heating cycle of the steam-fired absorption chiller / heater will be described with reference to FIG. During the heating operation, the switching valves 18 and 19 are open. The refrigerant vapor generated in the high-temperature regenerator 9 is directly introduced into the evaporator 1 via the refrigerant vapor pipes 15 and 15a and the switching valve 19, and is sprayed. Thereby, the hot water flowing through the evaporator heat transfer tube 4a in the evaporator 1 is heated, and the refrigerant vapor is condensed and liquefied. The heated flowing water is used as warm water, for example, for heating.

The refrigerant liquid condensed and liquefied by the evaporator 1 is guided by the refrigerant pump 3 through the refrigerant switching valve 18 and the refrigerant pipe 17 to the solution spray pipe 14 of the absorber 5, and the concentrated solution sprayed to the absorber 5. Dilute. The diluted absorbent is passed from the absorber 5 to the high-temperature regenerator 9 via the solution heat exchanger 8 through the solution pump 7 and the dilute solution pipe 13, partly to the high-temperature regenerator 9 via the dilute solution pipe 13 a, and the rest to the dilute solution pipe 13 b To the low-temperature regenerator 10. The concentrated concentrated solution passes through the concentrated solution pipe 14a from the high-temperature regenerator 9, passes through the concentrated solution pipe 14b from the low-temperature regenerator 10, passes through the solution heat exchanger 8, and then passes through the solution spray pipe 14. To return to the absorber 5 to make one cycle.

On the other hand, the drain of the high-temperature heat source vapor condensed by heating and condensing the dilute solution in the high-temperature regenerator 9 flows through the vapor drain pipe 21 and is sent to the high-temperature regenerator 9 by the dilute solution pipe 13a. Heat is exchanged by the drain cooler 20 with the dilute solution (all or part) sent to the low temperature regenerator 10 or the low temperature (about 90 ° C.) and returned.

According to the embodiment shown in FIG. 1, the absorption chiller is provided with a function of taking out hot water, and the temperature of the steam drain is reduced to the same level as that during the cooling operation even during the hot water operation. It is possible to provide a steam-fired absorption-type water chiller / heater having the function of performing the above.

[Embodiment 2] Next, FIG. 2 illustrates heat recovery of steam drain using hot water for heating in a heating cycle of a steam-fired absorption chiller / heater according to another embodiment of the present invention. It is a system diagram. In the figure, components having the same reference numerals as those in FIG. 1 are the same as those in the first embodiment, and the description thereof will be omitted. The embodiment shown in FIG. 2 is different from the embodiment shown in FIG. 1 in that a hot water drain cooler 23 according to a second drain cooler is provided in addition to the configuration of the steam-fired absorption chiller / heater of FIG. That is.

In FIG. 2, reference numeral 23 denotes a hot water drain cooler related to the second drain cooler.
The heat exchange between the hot water for heating flowing through the cold / hot water pipe 4 on the load side and the steam drain of the high-temperature heated steam drained in the high-temperature regenerator 9. 21a is a steam drain pipe on the drain cooler inflow side of the steam drain pipe 21, 21b
Is a steam drain pipe on the drain cooler outflow side of the steam drain pipe 21, 24a is a switching valve provided on the steam drain pipe 21a, and 24b is a switching valve provided on the steam drain pipe 21b.

Reference numeral 22 (general name of 22a and 22b) denotes a steam drain pipe connected to the steam drain pipe 21. 22a is
A steam drain pipe connected to the steam drain pipe 21a, 22b
Is a steam drain pipe connected to the steam drain pipe 21b, 25
a is a switching valve provided in the steam drain pipe 22a, 25b
Is a switching valve provided in the steam drain pipe 22b.

In the embodiment of FIG. 2, during heating,
The switching valves 24a and 24b of the steam drain pipes 21a and 21b on the drain cooler 20 side are closed, and the switching valves 25a and 25b of the steam drain pipes 22a and 22b on the hot water drain cooler 23 side are opened. Thus, heat recovery of the steam drain flowing through the steam drain pipe 21 by the hot water drain cooler 23 is performed. In this method, for example, the rare water sent from the absorber 5 to the high temperature regenerator 9 and the low temperature regenerator 10 by the solution pump 7 is used. The temperature of the solution approaches the vapor drain recovery temperature, and the drain cooler 2
An effect is obtained when the heat exchange effect of 0 is reduced.

[Embodiment 3] FIG. 3 shows still another embodiment of the present invention, in which the heat of a steam drain using a part of hot water for heating in a heating cycle of a steam-fired absorption chiller / heater is shown. It is a system diagram explaining collection | recovery. In the figure, components having the same reference numerals as those in FIG. 2 are the same as those in the second embodiment, and the description thereof will be omitted. The embodiment shown in FIG.
The difference from the second embodiment shown in FIG. 2 is that, in addition to the configuration of the steam-fired absorption-type chiller / heater shown in FIG. 1, a hot water drain cooler 23 </ b> A related to a second drain cooler that uses a part of the heating hot water is used. It is to provide.

In FIG. 3, reference numeral 23A denotes a hot water drain cooler relating to the second drain cooler. The heat exchange is performed between the steam drain drained in the high temperature regenerator 9. 26 is a heating hot water bypass pipe bypassed from the load side cold / hot water pipe 4, and 27 is a switching valve provided in the hot water bypass pipe 26.

In the embodiment shown in FIG. 2, during heating,
The switching valves 24a and 24b of the steam drain pipes 21a and 21b on the drain cooler 20 side are closed, and the switching valves 25a and 25b of the steam drain pipes 22a and 22b on the hot water drain cooler 23A side.
Is opened, and the switching valve 27 provided in the heating hot water pipe 26 is opened. Thus, heat recovery of the steam drain flowing through the steam drain pipe 21 by the hot water drain cooler 23A is performed. The temperature of the solution approaches the vapor drain recovery temperature, and the drain cooler 2
An effect is obtained when the heat exchange effect of 0 is reduced.

According to each of the above embodiments, in both the cooling operation and the heating operation, the high-temperature steam as the heating source is drained in the high-temperature regenerator by operating the switching valve. The drain can be drained and returned at a certain temperature (about 90 ° C) where it is easy to return the drain.

[0032]

As described above in detail, according to the present invention, it is possible to take out cold water or hot water from the evaporator by operating the switching valve. A steam-fired absorption chiller / heater having a function of returning steam drain water at a stable low temperature can be provided.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a heating cycle of a steam-fired absorption chiller / heater according to an embodiment of the present invention.

FIG. 2 is a system diagram illustrating heat recovery of steam drain using hot water for heating in a heating cycle of a steam-fired absorption chiller / heater according to another embodiment of the present invention.

FIG. 3 is a system diagram illustrating heat recovery of steam drain using a part of hot water for heating in a heating cycle of a steam-fired absorption chiller / heater according to still another embodiment of the present invention.

FIG. 4 is a system diagram showing a cooling cycle of the steam-fired absorption chiller / heater of FIG.

[Explanation of symbols]

1 evaporator, 2 refrigerant spray pipe, 3 refrigerant pump,
4: cold / hot water pipe, 4a: evaporator heat transfer pipe, 5: absorber, 6a
... Absorber heat transfer tube, 7 ... Solution pump, 8 ... Solution heat exchanger,
9: High temperature regenerator, 10: Low temperature regenerator, 11: Heat source steam pipe, 12: Condenser, 13: Dilute solution pipe, 14: Solution spray pipe, 15: Steam pipe, 16: Refrigerant liquid pipe, 17: Refrigerant pipe , 18, 19: switching valve, 20: drain cooler, 2
1, 22: steam drain pipe, 23, 23A: hot water drain cooler, 26: hot water bypass pipe, 24a, 24b, 25
a, 25b, 27 ... Switching valve.

Claims (3)

[Claims] 1. A high-temperature regenerator and a low-temperature regenerator for heating and concentrating a dilute solution to separate a refrigerant vapor, a condenser for liquefying the refrigerant vapor generated by these regenerators, and a refrigerant liquid on the load side. An evaporator for exchanging heat with the cold / hot water pipe to evaporate the refrigerant, an absorber for absorbing the refrigerant vapor generated by the evaporator into the concentrated solution sent from the high-temperature regenerator and the low-temperature regenerator, and And a piping system for operatively connecting the refrigerant to the evaporator via a high-temperature steam serving as a heating source, the refrigerant vapor generated by heating the dilute solution in the high-temperature regenerator through an on-off valve. In a steam-fired absorption chiller / heater configured to heat flowing hot water for heating, the low-temperature dilute solution supplied from the absorber to the high-temperature regenerator and the high-temperature steam serving as the heating source are converted to the high-temperature regeneration. With the steam drain drained in the vessel A first Dorenkura exchanging provided, steam-fired absorption chiller, characterized by heat recovering the steam drain until Kaemizu easy temperature. 2. The steam-fired absorption type chiller / heater according to claim 1, wherein heating hot water flowing through a load-side cold / hot water pipe and high-temperature steam as the heating source are drained in the high-temperature regenerator. A second drain cooler for exchanging heat between the first drain cooler and the second drain cooler. A steam-fired absorption chiller / heater, which is connected between 3. A steam-fired absorption chiller / heater according to claim 1, further comprising: a hot water bypass pipe for bypassing a portion of the heating hot water flowing through the load-side cold / hot water pipe with a switching valve. A part of the warm water for circulation and a second drain cooler for exchanging heat between the high-temperature steam as the heating source and the steam drain drained in the high-temperature regenerator,
A steam-fired absorption system characterized in that a steam drain piping system having a switching valve for switching between the first drain cooler and the second drain cooler is connected between the first drain cooler and the second drain cooler. Hot and cold water machine.