JPH0754772Y2 - Direct-fired double-effect absorption chiller / heater - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a direct-heating double-effect absorption cold / hot water machine, and more particularly to a direct-heating double-effect absorption cold / hot water machine equipped with a furnace tube smoke tube high-temperature regenerator. And a flue tube high temperature regenerator mounted on the water heater.

[Conventional technology]

As shown in Fig. 2, the high-temperature regenerator of a direct-burning double-effect absorption chiller-heater has a heating medium side on which the heating cylinder side burns fossil fuel such as city gas or kerosene, and a smoke tube through which the generated combustion gas passes. Mainly used is a flue tube high-temperature regenerator composed of parts. In many cases, the combustion gas generated in the furnace tube portion is usually brought into contact with the end plate once to reverse the direction and then flow into the smoke tube after the direction is reversed.

As mentioned above, the end plate has a jacket structure to prevent overheating due to direct contact with high temperature combustion gas and to prevent heat dissipation from the heated end plate to the atmosphere. After passing through the exchanger, it flows into the inside of the jacket structure of the end plate. The dilute solution that has passed through the inside of the jacket structure flows into the periphery of the furnace tube and the smoke tube section (hereinafter referred to as the furnace tube smoke tube section) through the upper and lower openings of the end plate and is heated by the combustion gas.

[Problems to be solved by the device]

However, since the dilute solution flowing into the end plate is heated in the high temperature heat exchanger and then flows into the end plate, the temperature is high at about 135 ° C, and the boiling temperature (about 15 ° C) of the dilute solution in the high temperature regenerator during cooling is about 15 ° C.
Because the temperature difference with (0 ℃) is small, combustion gas (about 1200 ℃)
A part of the solution boils at the end plate portion heated by, and high-temperature refrigerant vapor is generated. By filling the upper part of the jacket structure of the end plate with this refrigerant vapor, the flow of the dilute solution from the upper part of the jacket structure to the smoke tube part of the furnace tube is blocked, and the high temperature regenerator at the part where the flow of the dilute solution is blocked. Was likely to be locally overheated, which was a factor of lowering the durability of the high temperature regenerator.

An object of the present invention is to suppress boiling of a dilute solution in the end plate portion of a high temperature regenerator of a flue tube, and to avoid occurrence of local overheating of the high temperature regenerator.

[Means for Solving the Problems]

In the high temperature regenerator of the direct-fired double-effect absorption chiller-heater, the above-mentioned problems can be achieved by providing a partition wall so that the dilute solution does not flow between the furnace tube smoke pipe part and the end plate part of the jacket structure. .

The above-mentioned problem also includes a heat exchanger that heats at least one dilute solution, and a furnace tube smoke tube high-temperature regenerator that further heats the dilute solution heated by the heat exchanger, and
In the direct-burning double-effect absorption chiller-heater in which the end plate portion of the furnace tube smoke tube high-temperature regenerator has a jacket structure, in the diluted solution inlet side pipe of the heat exchanger and the jacket of the furnace tube smoke tube high-temperature regenerator. It is also achieved by communicating with the end plate part having the structure.

The above-mentioned subject is further provided with a partition wall so that the dilute solution does not flow between the furnace tube smoke tube part of the furnace tube smoke tube type high temperature regenerator and the end plate part forming the jacket structure.
It is also achieved by the direct-fired double-effect absorption chiller / heater described in.

[Action]

The dilute solution is diverted at the inlet side of the heat exchanger, one of which is heated by the heat exchanger and then flows into the flue tube of the high temperature regenerator, while the other is reheated at high temperature without passing through the heat exchanger. Flows into the end plate of the vessel. In other words, since the dilute solution of a relatively low temperature, which is not heated by the heat exchanger arranged immediately before the high temperature regenerator, flows into the end plate part, even if the end plate part is heated by the combustion gas, it is heated. The boiling point of the dilute solution is not reached. For this reason, no refrigerant vapor is generated in the end plate portion, and the flow of the dilute solution due to the presence of the refrigerant vapor is not obstructed, or the local overheating due to the presence of the refrigerant vapor without the dilute solution does not occur.

If a partition wall is installed between the smoke tube of the high temperature regenerator and the end plate of the jacket structure so that the dilute solution does not flow, it will be heated to a high temperature by the heat exchanger. There is no possibility that the solution will flow from the furnace tube to the end plate, and boiling at the end plate can be reliably suppressed.

〔Example〕

An embodiment of the present invention will be described with reference to FIG. The absorption chiller-heater shown in the figure separates a furnace tube smoke tube high temperature regenerator (hereinafter referred to as a high temperature regenerator) 1 for heating a dilute solution and a refrigerant vapor from the dilute solution heated by the high temperature regenerator 1. Separator 2
And the separator 2 connected to the liquid phase portion of the separator 2.
The high temperature heat exchanger 3 which uses the intermediate concentrated solution generated in step 1 as a heating fluid, and the intermediate concentrated solution pipe 4 on the heating fluid side of the high temperature heat exchanger 3.
Connected to the low temperature regenerator 5 for heating the intermediate concentrated solution to generate the refrigerant vapor and the concentrated solution, and the low temperature regenerator 5 connected to the liquid phase portion (bottom) to use the concentrated solution as a heating fluid. A low-temperature heat exchanger 6 and an absorber 7 which is connected to the heating fluid side (concentrated solution side) of the low-temperature heat exchanger 6 through a concentrated solution pipe 13 equipped with a spraying nozzle 14 for absorbing refrigerant vapor in the concentrated solution. An evaporator 8 which is provided in communication with the absorber 7 and which evaporates a liquid refrigerant supplied from a condenser 9 (not shown); and an evaporator 8 connected to the gas phase part of the low temperature regenerator 5 and supplied. A condenser 9 (not shown) for condensing the refrigerant vapor to be generated, and a solution which is connected to the bottom of the absorber 7 and sends the dilute solution produced in the absorber 7 to the heated fluid side of the low temperature heat exchanger 6. It is equipped with a pump 10. The concentrated solution pipe 13 communicates with the bottom of the absorber 7 via a solution bypass valve 15.

Although the heated fluid side of the high temperature regenerator 1 is composed of the end plate part and the furnace tube smoke pipe part and the end plate part has the jacket structure as in the prior art example, in the present embodiment, the end plate is The section 1A and the furnace tube smoke tube section 1B are partitioned by a partition wall 1C and are independent sections, respectively, and there is no dilute solution exchange between them. The heated fluid side of the low temperature heat exchanger 6 and the heated fluid side of the high temperature heat exchanger 3 are diluted solution tubes.
11, the fluid to be heated side of the high temperature heat exchanger 3 and the furnace tube smoke tube portion 1B of the high temperature regenerator 1 are communicated with each other. On the other hand, one end of the end plate 1A of the high temperature regenerator 1 is connected to the dilute solution pipe 11, and the other end of the end plate 1A is connected to the intermediate concentrated solution pipe 4. The separator 2 is connected to the evaporator 8 via a switching valve 12.

The operation of the absorption chiller-heater having the above structure during cooling will be described below. Both the device valve 12 and the solution bypass valve 15 are closed. The dilute solution sent from the absorber 7 by the solution pump 10 is heated by the concentrated solution in the low temperature heat exchanger 6 and then split, and one of the diluted solutions flows into the end plate portion 1A of the high temperature regenerator 1 and is heated by the combustion gas. Flows into the low temperature regenerator 5. The temperature of the dilute solution flowing into the end plate is about 80 ° C lower than that after passing through the conventional high temperature heat exchanger, and even if the temperature is increased in the end plate,
It is around 0 ° C and is below the boiling point of the dilute solution during cooling. Therefore, the dilute solution that has flowed into the end plate portion passes through the end plate portion in a liquid state without boiling, and then flows into the low temperature regenerator 5 through the intermediate concentrated solution pipe 4.

Further, the remaining dilute solution diverted at the outlet of the low-temperature heat exchanger (dilute solution pipe 11) is further heated by the high-temperature heat exchanger 3 and then flows into the furnace tube smoke pipe section 1B of the high-temperature regenerator 1 for combustion. It is heated by gas. The heated dilute solution is separated into the intermediate concentrated solution and the refrigerant vapor in the separator 2, and the intermediate concentrated solution passes through the heating fluid side of the high temperature heat exchanger 3 and the diluted solution heated in the end plate portion 1A. They merge and flow into the low temperature regenerator 5. Separator 2
The refrigerant vapor separated in (4) is sent to the low temperature regenerator 5 to heat the mixture of the pre-dilute solution and the intermediate concentrated solution flowing into the low temperature regenerator to further generate the refrigerant vapor. The mixture that has generated the refrigerant vapor becomes a concentrated solution and is sent to the absorber 7 via the heating fluid side of the low temperature heat exchanger 6.

The refrigerant vapor generated in the low temperature regenerator 5 and the refrigerant vapor used for heating the mixture of the dilute solution and the intermediate concentrated solution in the low temperature regenerator 5 are condensed in the condenser to become the liquid refrigerant and supplied to the evaporator 8. It The liquid refrigerant supplied to the evaporator 8 deprives the heat of evaporation from the cooling fluid in the cold water coil on the cold water coil installed in the evaporator 8 and evaporates to become a refrigerant vapor, which cools the fluid.

The refrigerant vapor generated in the evaporator 8 flows into the absorber 7 communicating with the evaporator 8 and is absorbed by the concentrated solution sprayed on the cooling coil installed in the absorber 7 to become a dilute solution. .
Since the refrigerant vapor generated in the evaporator 8 is absorbed by the concentrated solution, the pressure inside the evaporator is maintained at a required low pressure, and the evaporation of the liquid refrigerant inside the evaporator is continuously performed.

At the time of heating, the switching valve 12 and the solution bypass valve 15 are switched to the open state. The dilute solution produced in the absorber 7 is
As in the case of cooling, after being heated through the heated fluid side of the low temperature heat exchanger, it flows directly into the end plate 1A of the high temperature regenerator 1 and the high temperature heat exchanger 3 and then the furnace tube of the high temperature regenerator 1. Smoke pipe
Divided into the flow that flows into 1B. The diluted solution directly flowing into the end plate portion 1A is heated, then flows into the concentrated solution pipe 13 through the heating fluid side of the low temperature regenerator 5 and the low temperature heat exchanger 6, and passes through the opened solution bypass valve 15. Enters the bottom of absorber 7. The diluted solution that has flowed into the furnace tube smoke pipe section 1B becomes a medium concentrated solution and a refrigerant vapor after being heated, and both flow into the evaporator 8 through the separator 2 and the switching valve 12 for heating the cold water coil. Heat the fluid. The intermediate concentrated solution and the refrigerant vapor after heating the heating fluid pass through the solution bypass valve 15 and the absorber 7
It merges with the dilute solution that has entered and returns to the dilute solution, and the solution pump 10
Is sent again to the low temperature heat exchanger, and the above cycle is repeated.

During the heating operation, the temperature of the dilute solution when directly flowing into the end plate portion 1A is about 85 ° C, and the temperature rise range in the end plate portion 1A is about 20 ° C.
Since it is ℃, even after heating with the end plate portion 1A, the temperature of the dilute solution does not rise to the boiling point (110 ° C) of the dilute solution during heating,
Boiling does not occur in the end plate portion 1A even during heating.

[Effect of device]

According to the present invention, the temperature of the dilute solution flowing into the end plate portion of the high temperature regenerator is made lower than the temperature of the dilute solution flowing into the furnace tube smoke pipe portion of the high temperature regenerator, so It becomes possible to suppress the generation of refrigerant vapor by eliminating boiling,
There is no local overheating of the high temperature regenerator due to the presence of refrigerant vapor,
The effect of a direct-fired double-effect absorption chiller-heater with good durability can be obtained.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention, and FIG. 2 is a system diagram showing an example of a conventional technique. 1 ... Reactor tube smoke tube type high temperature regenerator, 1A ... End plate part, 1B ... Reactor tube smoke tube part, 1C ... Partition wall, 3 ... Heat exchanger (high temperature heat exchanger).

Claims (3)

[Scope of utility model registration request] 1. A furnace tube smoke tube type high temperature regenerator for a direct-fired double-effect absorption chiller-heater, wherein a partition wall is provided between the furnace tube smoke tube section and the end plate section of the jacket structure so that a dilute solution does not flow. A high-temperature regenerator with a smoke tube. 2. A heat exchanger for heating at least one dilute solution, and a furnace tube smoke tube high temperature regenerator for further heating the dilute solution heated by the heat exchanger, and the furnace. In the direct-fired double-effect absorption chiller-heater in which the end plate of the tube smoke type high temperature regenerator has a jacket structure, the diluted solution inlet side pipe of the heat exchanger and the jacket structure of the furnace tube smoke type high temperature regenerator are used. A direct-burning double-effect absorption chiller / heater characterized by being communicated with the end plate part that is formed. 3. A partition wall is provided between the flue tube part of the flue tube high temperature regenerator and the end plate part having a jacket structure so that a dilute solution does not flow. Item 3. A direct-fire double-effect absorption chiller-heater according to Item 2.