JP4043101B2 - Heat exchanger and regenerator and absorption refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorption refrigerator that uses water as a refrigerant and a lithium bromide solution as an absorbent, a regenerator that is applied to the absorption refrigerator as a low-pressure regenerator or a high-pressure regenerator, and the regenerator. The present invention relates to a heat exchanger to be applied.
[0002]
[Prior art]
The absorption refrigerator is a refrigerator using water as a refrigerant, lithium bromide solution as an absorbent, and gas fuel or oil fuel as an energy source. This absorption refrigerator is configured with an evaporator, an absorber, a regenerator, and a condenser as main members, and the inside of the evaporator and the absorber is maintained in a high vacuum (absolute pressure is 6 to 7 mmHg). .
[0003]
In this evaporator, the refrigerant (water) sent by the refrigerant pump is sprayed toward the evaporator tube through which cold water (12 ° C.) flows, whereby the refrigerant is heated and becomes refrigerant vapor. That is, since the evaporator is a high vacuum container, water (refrigerant) boils at about 4-6 ° C. and evaporates, so that cold water at 12 ° C. can be used as heat source water.
[0004]
Then, the cold water drops in temperature by the amount of latent heat of evaporation given to the refrigerant (water) (7 ° C.) and exits the evaporator. The chilled water whose temperature has been lowered (becomes 7 ° C.) in this way is sent to a building cooling device or the like (cooling load) and used for cooling. The cold water used for cooling rises in temperature (becomes 12 ° C.) and flows again into the evaporator tube of the evaporator.
[0005]
On the other hand, in the absorber, the refrigerant vapor generated in the evaporator is absorbed by the lithium bromide solution. A lithium bromide solution that has absorbed water and has a reduced concentration (hereinafter referred to as a “lithium bromide dilute solution”) is collected at the bottom of the absorber. In this absorber, the latent heat of condensation when the refrigerant vapor is absorbed by the lithium bromide solution and changes from gas (water vapor) to liquid (water), and when the lithium bromide solution absorbs moisture and the concentration decreases. Since dilution heat is generated, the heat is removed by cooling water (circulated in a system different from the above-mentioned “cold water”). Note that the lithium bromide solution has a high moisture absorption because it has a lower partial pressure of water vapor than the saturated vapor of water, and is a suitable material for absorbing refrigerant vapor.
[0006]
In the regenerator, the lithium bromide dilute solution sent from the absorber is heated. Therefore, a part of the refrigerant in the lithium bromide dilute solution is evaporated and the solution becomes a concentrated lithium bromide solution (hereinafter referred to as “lithium bromide concentrated solution”). The concentrated lithium bromide solution whose concentration has been increased to the original state is sent to the absorber and again absorbs the refrigerant vapor. On the other hand, the evaporated refrigerant vapor is sent to the condenser.
[0007]
In the actual machine, a double-effect absorption refrigerator having two stages of regenerators is used for the purpose of increasing thermal efficiency and reducing heating energy. In this double-effect absorption refrigerator, as a regenerator, a high-pressure regenerator that heats a diluted lithium bromide solution by burning supplied fuel and a high-temperature refrigerant vapor generated in the high-pressure regenerator are heated. And a low-pressure regenerator for heating the diluted lithium bromide solution as a source.
[0008]
Further, in the condenser, the refrigerant vapor sent from the regenerator is cooled by cooling water to be condensed and liquefied. This condensed water is supplied again to the evaporator as a refrigerant (water).
[0009]
Thus, in the absorption refrigerator, the refrigerant (water) changes with water-steam-water (phase change), and the lithium bromide solution changes with concentrated solution-dilute solution-concentrated solution (concentration change). )do. The absorption refrigerator produces cold water by the latent heat of vaporization of water in the process of phase change (refrigerant) and concentration change (lithium bromide solution), and absorbs water vapor by the absorption capability of the lithium bromide solution. Is a device that repeatedly performs in a high vacuum sealed system.
[0010]
In such an absorption refrigerator, the amount of fuel supplied to the high-pressure regenerator is increased to increase the heating amount, and by increasing the concentration of the lithium bromide solution, the temperature of the cold water exiting the evaporator can be lowered. it can. Conversely, by reducing the amount of fuel supplied to the high-pressure regenerator, reducing the amount of heating, and reducing the concentration of the lithium bromide solution, the temperature of the cold water exiting the evaporator can be raised. In this way, by adjusting the concentration of the lithium bromide solution, the temperature of the cold water is controlled, and the temperature of the cold water leaving the evaporator is set to a set temperature (7 ° C.).
[0011]
[Problems to be solved by the invention]
By the way, the above-described high-pressure regenerator of an absorption refrigerator has a liquid tank for storing a lithium bromide solution having a low concentration as a result of absorbing a refrigerant in a fuselage, and a furnace tube having a combustion burner attached to one end thereof. A plurality of heat transfer tubes penetrating the liquid tank are connected, and each heat transfer tube is connected to a discharge tube for discharging exhaust gas to the outside. Therefore, the lithium bromide solution that has become a low concentration by absorbing the refrigerant stored in the liquid tank, the combustion gas of the combustion burner passes through the plurality of heat transfer tubes through the furnace tube, In the lithium bromide solution, a part of the refrigerant evaporates and the lithium bromide solution is concentrated to a high concentration.
[0012]
A plurality of heat transfer tubes of such a high-pressure regenerator generally use steel tubes, and heat exchange is performed between the combustion gas passing through the inside and the external lithium bromide solution, that is, the lithium bromide solution is converted by the combustion gas. The refrigerant is evaporated by heating. In this case, the efficiency of heat exchange between the combustion gas and the lithium bromide solution is determined by the surface area of the heat transfer tube, and in order to increase the efficiency of heat exchange, the number of heat transfer tubes can be increased, There is a problem that it is necessary to increase the length, and the apparatus becomes large.
[0013]
The present invention solves such a problem, and improves the efficiency of heat exchange between fluids such as between a combustion gas and a lithium bromide solution, thereby reducing the size of the apparatus. And it aims at providing a regenerator and an absorption refrigerator.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the heat exchanger of the invention of claim 1 includes a plurality of heat transfer tubes in which the second fluid flows in the liquid tank in which the first fluid is stored. Horizontally In the heat exchanger configured to pass through and perform heat exchange between the first fluid and the second fluid, a small-diameter tube whose end is closed is disposed in the heat transfer tube, and The liquid tank and the small-diameter pipe are communicated with each other by a plurality of bypass pipes, and fins are provided on the outer peripheral portion of the small-diameter pipe so as to generate turbulence in the second fluid flowing in the heat transfer pipe. And the small-diameter pipe is disposed in the lower part of the heat transfer pipe and welded to the heat transfer pipe, and the fan-shaped fin is fixed to the upper outer periphery of the small-diameter pipe. The upper part of the small-diameter pipe is formed by the bypass pipe. The lower layer of the small-diameter pipe communicated with the liquid tank through a communication hole formed in the small-diameter pipe and the heat transfer pipe. It is characterized by this.
[0015]
Further, the regenerator of the invention of claim 2 comprises a liquid tank for storing a lithium bromide solution that has become a low concentration by absorbing the refrigerant, a combustion burner, a furnace tube through which the combustion gas of the combustion burner flows, The liquid tank is connected to the furnace tube Horizontally A lithium bromide solution having a low concentration by absorbing a refrigerant stored in the liquid tank, comprising a plurality of through-hole heat transfer tubes and a discharge tube connected to the heat transfer tubes and discharging exhaust gas to the outside Is heated by the combustion gas passing through the plurality of heat transfer tubes, thereby evaporating the refrigerant in the lithium bromide solution to increase the concentration of the lithium bromide solution. A small-diameter pipe closed is disposed, and the liquid tank and the small-diameter pipe are connected by a plurality of bypass pipes, and turbulence is generated in the combustion gas flowing in the heat transfer pipe at the outer peripheral portion of the small-diameter pipe. Set the fins to The small-diameter pipe is disposed in the lower part of the heat transfer pipe and welded to the heat transfer pipe, and the fan-shaped fin is fixed to the upper periphery of the small-diameter pipe. The upper part of the small-diameter pipe is formed by the bypass pipe. The lower layer of the small-diameter pipe communicated with the liquid tank through a communication hole formed in the small-diameter pipe and the heat transfer pipe. It is characterized by this.
[0016]
Further, the absorption refrigerator according to the invention of claim 3 is an evaporator in which the refrigerant is evaporated and vaporized by spraying the refrigerant toward an evaporator tube through which cold water whose temperature has been increased by cooling is circulated. And an absorber that absorbs the refrigerant vapor generated in the evaporator with a concentrated lithium bromide solution; and the lithium bromide solution that has absorbed the refrigerant to a low concentration and is heated with a combustion gas to form a lithium bromide solution A regenerator that evaporates the refrigerant therein and supplies the lithium bromide solution at a high concentration to the absorber; a condenser that condenses and condenses the refrigerant vapor generated in the regenerator to the evaporator; In the absorption refrigerator having the above, the regenerator includes a liquid tank for storing the lithium bromide solution in a furnace tube in which the combustion gas of the combustion burner flows. Horizontally A plurality of through-hole heat transfer pipes are connected, and a discharge pipe for discharging exhaust gas to the outside is connected to the heat transfer pipe, and a small-diameter pipe whose end is closed is disposed in the heat transfer pipe, and The liquid tank and the small diameter pipe communicate with each other by a plurality of bypass pipes, and fins are provided on the outer peripheral portion of the small diameter pipe so as to generate turbulent flow in the combustion gas flowing in the heat transfer pipe, The small-diameter pipe is disposed in the lower part of the heat transfer pipe and welded to the heat transfer pipe, and the fan-shaped fins are fixed to the upper periphery of the small-diameter pipe. The upper part of the small-diameter pipe is The lower diameter pipe communicated with the liquid tank through a communication hole formed in the small diameter pipe and the heat transfer pipe. It is characterized by this.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0018]
FIG. 1 shows the present invention. Reference example Fig. 2 shows a cross-section of the heat transfer tube, and Fig. 3 shows Reference example 4 is a schematic cross-sectional view of the high-pressure regenerator, FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, and FIG. Reference example The schematic structure of this absorption refrigerator is shown.
[0019]
Book Reference example As shown in FIG. 5, the evaporator 10 and the absorber 20 are configured in the same shell (high vacuum container). An evaporator tube 11 is disposed in the evaporator 10. Cold water W1 is supplied to the evaporator tube 11 via the cold water inlet line L1, and the cold water W1 flowing through the evaporator tube 11 is discharged to the outside via the cold water outlet line L2. Further, the refrigerant (water) R pumped up by the refrigerant pump P <b> 1 through the refrigerant line L <b> 11 is sprayed toward the evaporator tube 11. The sprayed refrigerant R takes away the latent heat of vaporization from the cold water W1 flowing through the evaporator tube 11 and evaporates and becomes the refrigerant vapor r. The refrigerant vapor r flows into the absorber 20 side.
[0020]
The cold water W1 enters the evaporator 10 at a temperature of 12 ° C., is cooled by the evaporator tube 11, and is discharged from the evaporator 10 at a temperature of 7 ° C. The cold water W1 of 7 ° C. coming out from the cold water outlet line L2 is used for cooling the building or for a factory process. The chilled water W1 provided for cooling under a cooling load such as building cooling rises in temperature and reaches a temperature of 12 ° C. and flows into the evaporator 10 again.
[0021]
On the other hand, an absorber tube 21 is disposed in the absorber 20. The absorber tube 21 is supplied with cooling water W2 via a cooling water line L3. The lithium bromide concentrated solution Y1 that has been pumped by the solution pump P2 through the solution line L21 is sprayed toward the absorber tube 21. For this reason, the sprayed lithium bromide concentrated solution Y1 absorbs the refrigerant vapor r flowing into the absorber 20 side, and the concentration decreases. The diluted lithium bromide solution Y3 having a reduced concentration is collected at the bottom of the absorber 20. The heat generated in the absorber 20 is cooled by the cooling water W2 that flows through the absorber tube 21.
[0022]
The lithium bromide dilute solution Y3 collected at the bottom of the absorber 20 is pumped by the solution pump P3, and passes through the valve V5, the low temperature heat exchanger 30, the solution line L22, the high temperature heat exchanger 31, and the solution line L23. The high pressure regenerator 40 is supplied.
[0023]
The high-pressure regenerator 40 is equipped with a burner while accommodating a furnace tube and a heat transfer tube in the body. The high pressure regenerator 40 is supplied with the fuel gas G through the gas line L31, the valve V21, and the fuel control valve V22, thereby burning the fuel gas G and heating the lithium bromide dilute solution Y3. The lithium bromide dilute solution Y3 supplied to the high-pressure regenerator 40 is heated, and a part of the refrigerant is evaporated to become a solution in lithium bromide Y2 having a medium concentration. The solution Y2 in lithium bromide is supplied to the low pressure regenerator 50 through the solution line L24 and the high temperature heat exchanger 31.
[0024]
On the other hand, the refrigerant vapor r evaporated in the high-pressure regenerator 40 is supplied to the low-pressure regenerator tube 51 of the low-pressure regenerator 50 via the refrigerant line L12, and further supplied to the condenser 60 via the refrigerant line L13. The The low pressure regenerator 50 and the condenser 60 are configured in the same shell.
[0025]
In this low pressure regenerator 50, the solution Y2 in lithium bromide is supplied via the solution line L24, and the lithium bromide dilute solution Y3 branched from the solution line L22 via the solution line L25 is the low pressure regenerator tube 51. It is sprayed toward. In this low-pressure regenerator 50, the solutions Y2 and Y3 are heated by the low-pressure regenerator tube 51, a part of the refrigerant evaporates and the concentration of the solution further increases, and the high-concentration lithium bromide concentrated solution Y1 becomes a low-pressure regenerator. Collected at the bottom of 50. This lithium bromide concentrated solution Y1 is supplied again to the absorber 20 by the solution pump P2.
[0026]
Further, the condenser 60 is provided with a condenser tube 61 to which the cooling water W2 is supplied by the cooling water line L4. In the condenser 60, the refrigerant vapor r evaporated by the high-pressure regenerator 40 and supplied via the refrigerant line L 12, the low-pressure regenerator tube 51 and the refrigerant line L 13 is evaporated and condensed by the low-pressure regenerator 50. The refrigerant vapor r flowing into the condenser 60 side is cooled and condensed in the condenser tube 61 to become refrigerant (water) R. The refrigerant R is sent to the evaporator 10 via the refrigerant line L14 due to gravity and a pressure difference. The refrigerant R collected at the bottom of the evaporator 10 is again sprayed toward the evaporator tube 11 via the refrigerant line L11 by the refrigerant pump P1.
[0027]
In the above-described absorption refrigerator, during the cooling operation, the valves V1, V2, V3, V4 are closed (shown in black in the figure), and the valves V5, V11, V12, V13, V14 are open. (It is outlined in the figure). Moreover, although an absorption refrigerator can also perform heating operation, since it is not related to this invention, description of operation | movement at the time of heating operation is omitted.
[0028]
Here, the book mentioned above Reference example The structure of the high-pressure regenerator 40 in the absorption refrigerator will be specifically described.
[0029]
As shown in FIGS. 3 and 4, in the high pressure regenerator 40, a liquid tank 42 that stores a lithium bromide solution that has been absorbed by the refrigerant and has a low concentration is formed on the upper portion of the body 41. A cylindrical furnace tube 43 having a substantially cylindrical shape is formed in a lower part of the body 41, and a combustion burner 44 is fixed to a base end portion of the furnace tube 43. Further, a plurality of heat transfer tubes 45 that horizontally penetrate the liquid tank 42 and constitute a heat exchanger are provided, and the base end portion of each heat transfer tube 45 is connected to the distal end portion of the furnace tube 43 via the communication passage 46. It is connected. And the front-end | tip part of each heat exchanger tube 45 is connected with the discharge pipe 47. As shown in FIG.
[0030]
In the high-pressure regenerator 40 configured as described above, as shown in FIGS. 1 and 2, a small-diameter tube 71 whose ends are closed is disposed at a substantially central position in the heat transfer tube 45. The upper and lower parts communicate with each other by a liquid tank 42 and a bypass pipe 72 at a plurality of positions in the direction. And the fin 73 is being fixed to the outer peripheral part of this small diameter pipe | tube 71 in multiple places so that the turbulent flow may be generated in the combustion gas C which flows through the inside of the heat exchanger tube 45. FIG. Book Reference example Then, the first fluid is the lithium bromide dilute solution Y3 stored in the liquid tank 42, and the second fluid is the combustion gas C flowing in the heat transfer tube 45.
[0031]
Accordingly, as shown in FIGS. 1 to 5, the lithium bromide diluted solution Y3 supplied to the high-pressure regenerator 40 is stored in the liquid tank 42. On the other hand, the fuel gas G is supplied through the gas line L31, the valve V21, and the fuel control valve V22. The fuel gas G is combusted by the combustion burner 44, and the combustion gas C passes through the furnace tube 43 and transmits a plurality of fuel gases. It flows into the heat pipe 45. Then, heat exchange is performed between the combustion gas C passing through the inside of each heat transfer tube 45 and the outside, that is, the lithium bromide dilute solution Y3 stored in the liquid tank 42. The dilute solution Y3 is heated and the refrigerant evaporates.
[0032]
At this time, the small diameter pipe 71 is disposed in the heat transfer pipe 45, and the lithium bromide dilute solution Y <b> 3 in the liquid tank 42 flows into the small diameter pipe 71 through the bypass pipes 72. Therefore, the heat transfer area between the combustion gas C and the lithium bromide dilute solution Y3 is increased, and the heat exchange efficiency is improved. A plurality of fins 73 are fixed to the outer peripheral portion of the small-diameter tube 71 so as to be located in the heat transfer tube 45. Therefore, the heat transfer area between the combustion gas C and the lithium bromide dilute solution Y3 increases, and the combustion gas C flowing in the heat transfer tube 45 becomes turbulent by the fins 73, and the lithium bromide dilute solution Y3 from the combustion gas C Heat transfer to is promoted. Then, the lithium bromide dilute solution Y3 in the liquid tank 42 becomes a solution in lithium bromide Y2 having a medium concentration by evaporating part of the refrigerant. The solution Y2 in lithium bromide is supplied to the low pressure regenerator 50 through the solution line L24 and the high temperature heat exchanger 31.
[0033]
Book like this Reference example In the absorption refrigerator having the high pressure regenerator 40, a small-diameter pipe 71 whose end is closed is disposed in the heat transfer pipe 45 and communicated by the liquid tank 42 and the bypass pipe 72. By fixing a plurality of fins 73 so as to generate a turbulent flow in the combustion gas C flowing in the heat transfer tube 45 on the outer periphery of the heat transfer area, the heat transfer area between the combustion gas C and the lithium bromide dilute solution Y3 is increased. The combustion gas C flowing in the heat transfer tube 45 becomes turbulent and heat transfer from the combustion gas C to the lithium bromide dilute solution Y3 can be promoted to improve the heat exchange efficiency. On the other hand, the length of the heat transfer tube 45 can be shortened, or the number of the heat transfer tubes 45 can be reduced.
[0034]
FIG. 6 shows the present invention. The fruit The cross section of the heat exchanger which concerns on embodiment is shown. As mentioned above Reference example The members having the same functions as those described in the above will be given the same reference numerals and redundant description will be omitted.
[0035]
In the high pressure regenerator, as shown in FIG. 6, small diameter pipes 71 whose ends are closed are disposed in the lower part of the heat transfer pipe 45, and the upper part is bypassed from the liquid tank 42 at a plurality of positions in the axial direction. The tube 72 communicates with the lower portion and the lower portion communicates with the communication hole 74. A plurality of fan-like fins 73 are fixed on the outer periphery of the small-diameter pipe 71 so as to generate turbulent flow in the combustion gas C flowing in the heat transfer pipe 45.
[0036]
Accordingly, when the combustion gas C flows into the heat transfer tubes 45 with respect to the lithium bromide dilute solution Y3 stored in the liquid tank 42, the combustion gas C and the outside, that is, the lithium bromide dilute in the liquid tank 42 Heat exchange is performed with the solution Y3, the lithium bromide diluted solution Y3 is heated by the combustion gas C, and the refrigerant evaporates. At this time, since the lithium bromide dilute solution Y3 flows into the small-diameter tube 71 in the heat transfer tube 45 from the liquid tank 42 through the bypass pipes 72 and the communication holes 74, the combustion gas C and the dilute lithium bromide solution The heat transfer area with Y3 is increased and the heat exchange efficiency is improved. In addition, since a plurality of fins 73 are fixed to the outer peripheral portion of the small diameter tube 71 in the heat transfer tube 45, the heat transfer area between the combustion gas C and the lithium bromide dilute solution Y3 is increased, and the heat transfer is increased. The combustion gas C flowing in the heat tube 45 becomes a turbulent flow by the fins 73, and heat transfer from the combustion gas C to the lithium bromide dilute solution Y3 is promoted. The lithium bromide dilute solution Y3 in the liquid tank 42 is partly evaporated to evaporate into a lithium bromide solution Y2 having a medium concentration, and is supplied to the low pressure regenerator.
[0037]
Thus, in the absorption refrigerator having the high-pressure regenerator 40 according to the present embodiment, the liquid tank 42, the bypass pipe 72, and the communication hole are provided by disposing the small-diameter pipe 71 whose end is closed in the heat transfer pipe 45. 74 and a plurality of fins 73 are fixed to the outer peripheral portion of the small-diameter pipe 71 so as to generate a turbulent flow in the combustion gas C flowing in the heat transfer pipe 45, so that the combustion gas C and the lithium bromide diluted solution are fixed. As the heat transfer area with Y3 increases, the combustion gas C flowing in the heat transfer tube 45 becomes turbulent and heat transfer from the combustion gas C to the lithium bromide dilute solution Y3 is promoted, improving the heat exchange efficiency. As a result, while the capacity of the absorption refrigerator can be improved, the length of the heat transfer tube 45 can be shortened, or the number of the heat transfer tubes 45 can be reduced, thereby reducing the size and size of the apparatus. Further, a small-diameter pipe 71 is disposed in the lower part of the heat transfer pipe 45, the upper part communicates with the liquid tank 42 by the bypass pipe 72, and the lower part serves as the communication hole 74. Therefore It is in communication with the liquid tank 42, and it is only necessary to attach the bypass pipe 72 after welding the small-diameter pipe 71 in the heat transfer pipe 45. The workability of the heat exchanger is better than that of the first embodiment described above.
[0038]
In the present invention, one small-diameter tube 71 is disposed in the heat transfer tube 45. However, a plurality of small-diameter tubes 71 may be disposed in the axial direction, or a plurality of small-diameter tubes 71 may be disposed in parallel in the radial direction. The upper and lower portions of the small diameter pipe 71 are communicated with the liquid tank 42 by the bypass pipe 72, but the left and right portions may be communicated.
[0039]
【The invention's effect】
As described above in detail in the embodiment, according to the heat exchanger of the first aspect of the present invention, there are a plurality of heat transfer tubes in which the second fluid flows in the liquid tank in which the first fluid is stored. Horizontally Penetrate A heat exchanger configured to exchange heat between the first fluid and the second fluid; While arranging a small-diameter tube whose end is closed in the heat transfer tube, Said Liquid tank and The The small diameter pipe communicates with multiple bypass pipes, The On the outer periphery of the small diameter pipe Said Flows in the heat transfer tube Said Fins are installed to generate turbulence in the second fluid The small-diameter pipe is disposed in the lower part of the heat transfer pipe and welded to the heat transfer pipe, and the fan-shaped fin is fixed to the upper periphery of the small-diameter pipe. The upper part of the small-diameter pipe is formed by the bypass pipe. The lower layer of the small-diameter pipe communicated with the liquid tank through a communication hole formed in the small-diameter pipe and the heat transfer pipe. Therefore, the heat transfer area between the first fluid and the second fluid increases, and the second fluid flowing in the heat transfer tube becomes turbulent and heat transfer is promoted to improve heat exchange efficiency. The heat exchanger can be made smaller and more compact by shortening the length of the heat transfer tubes and reducing the number of tubes.
[0040]
According to the regenerator of the second aspect of the present invention, the liquid tank for storing the lithium bromide solution that has absorbed the refrigerant and has become low in concentration. And a combustion burner, Combustion gas of combustion burner Is connected to the furnace tube and the furnace tube Liquid tank Horizontally Multiple heat transfer tubes that penetrate And a discharge pipe that is connected to the heat transfer pipe and discharges the exhaust gas to the outside, and absorbs the refrigerant stored in the liquid tank to reduce the concentration of the lithium bromide solution to the plurality of heat transfer pipes. In the regenerator in which the refrigerant in the lithium bromide solution is evaporated by heating with the combustion gas passing through the pipe so that the lithium bromide solution has a high concentration. While arranging a small-diameter tube whose end is closed in the heat transfer tube, Said Liquid tank and The The small diameter pipe communicates with multiple bypass pipes, The On the outer periphery of the small diameter pipe Said Fins are installed to generate turbulent flow in the combustion gas flowing in the heat transfer tube. The small-diameter pipe is disposed in the lower part of the heat transfer pipe and welded to the heat transfer pipe, and the fan-shaped fin is fixed to the upper periphery of the small-diameter pipe. The upper part of the small-diameter pipe is formed by the bypass pipe. The lower layer of the small-diameter pipe communicated with the liquid tank through a communication hole formed in the small-diameter pipe and the heat transfer pipe. Therefore, the heat transfer area between the first fluid and the second fluid is increased, and the second fluid flowing in the heat transfer tube is turbulent to promote heat transfer and improve heat exchange efficiency. The regenerator can be made smaller and more compact by shortening the length of the heat transfer tubes or reducing the number of tubes.
[0041]
According to the absorption refrigerator of the invention of claim 3, the refrigerant is evaporated and vaporized by spreading the refrigerant toward the evaporator tube through which the chilled water whose temperature is increased by cooling is circulated. An evaporator, an absorber that absorbs refrigerant vapor generated in the evaporator with a concentrated lithium bromide solution, and a lithium bromide solution that has absorbed the refrigerant to a low concentration and is heated by combustion gas to bromide A regenerator that evaporates the refrigerant in the lithium solution to supply the lithium bromide solution at a high concentration to the absorber, and a condenser that condenses the refrigerant vapor generated in the regenerator and supplies the condensed refrigerant to the evaporator In the absorption refrigerator having a regenerator, the regenerator includes a liquid tank for storing a lithium bromide solution in a furnace tube in which the combustion gas of the combustion burner flows. Horizontally A plurality of through-hole heat transfer pipes are connected, and a discharge pipe for discharging exhaust gas to the outside is connected to the heat transfer pipe, and a small-diameter pipe whose end is closed is disposed in the heat transfer pipe, and The liquid tank and the small-diameter pipe are connected by a plurality of bypass pipes, and fins are provided on the outer periphery of the small-diameter pipe so as to generate turbulent flow in the combustion gas flowing in the heat transfer pipe. The small-diameter pipe is disposed in the lower part of the heat transfer pipe and welded to the heat transfer pipe, and the fan-shaped fin is fixed to the upper periphery of the small-diameter pipe. The upper part of the small-diameter pipe is formed by the bypass pipe. The lower layer of the small-diameter pipe communicated with the liquid tank through a communication hole formed in the small-diameter pipe and the heat transfer pipe. Therefore, the heat transfer area between the first fluid and the second fluid is increased, and the second fluid flowing in the heat transfer tube is turbulent to promote heat transfer and improve heat exchange efficiency. The absorption refrigerator can be made smaller and more compact by shortening the length of the heat transfer tubes and reducing the number of tubes.
[Brief description of the drawings]
FIG. 1 of the present invention Reference example It is the schematic of the heat exchanger tube as a heat exchanger concerning.
FIG. 2 is a cross-sectional view of a heat transfer tube.
[Figure 3] Book Reference example It is a schematic sectional drawing of a high-pressure regenerator.
4 is a cross-sectional view taken along the line IV-IV in FIG. 3;
[Figure 5] Book Reference example It is a schematic block diagram of this absorption refrigerator.
FIG. 6 The fruit It is sectional drawing of the heat exchanger which concerns on embodiment.
[Explanation of symbols]
10 Evaporator
20 Absorber
30 Low temperature heat exchanger
31 High temperature heat exchanger
40 High pressure regenerator
42 Liquid tank
43 Furnace
44 Combustion burner
45 Heat transfer tube
47 discharge pipe
48 recess
50 Low pressure regenerator
60 condenser
71 Small diameter pipe
72 Bypass pipe
73 Fin
74 Communication hole
P1 refrigerant pump
P2, P3 solution pump
L1 cold water inlet line
L2 cold water outlet line
L3, L4 Cooling water line
L11-L15 Refrigerant line
L21-L25 Solution line
L31 Gas (fuel) line
R refrigerant (water)
r Refrigerant vapor
Y1 concentrated lithium bromide solution
Y2 Solution in lithium bromide
Y3 Lithium bromide dilute solution
W1 cold water
W2 cooling water
C Combustion gas
G Fuel gas

Claims (3)

A plurality of heat transfer tubes through which the second fluid flows are horizontally penetrated in the liquid tank in which the first fluid is stored, and heat exchange is performed between the first fluid and the second fluid. In the heat exchanger, a small-diameter tube whose end is closed is disposed in the heat transfer tube, and the liquid tank and the small-diameter tube are communicated with each other by a plurality of bypass tubes, and the heat transfer tube is connected to an outer peripheral portion of the small-diameter tube. setting the fins so as to generate turbulence in the second fluid flow heat pipe,
The small-diameter pipe is disposed in the lower part of the heat transfer pipe and welded to the heat transfer pipe, and the fan-shaped fins are fixed to the upper periphery of the small-diameter pipe. The upper part of the small-diameter pipe is The heat exchanger is characterized in that it communicates with a layer, and the lower part of the small-diameter pipe communicates with the liquid tank through a communication hole formed in the small-diameter pipe and the heat transfer pipe . A liquid tank for storing a lithium bromide solution having a low concentration by absorbing the refrigerant, a combustion burner, a furnace tube through which combustion gas of the combustion burner flows, and the liquid tank connected to the furnace tube and A plurality of heat transfer tubes that penetrate horizontally and a discharge tube connected to the heat transfer tubes and exhausting the exhaust gas to the outside, absorbing the refrigerant stored in the liquid tank and reducing the concentration of the bromide In the regenerator in which the lithium bromide solution is concentrated by heating the lithium solution with the combustion gas passing through the plurality of heat transfer tubes to evaporate the refrigerant in the lithium bromide solution. A small-diameter pipe whose end is closed is disposed, and the liquid tank and the small-diameter pipe are communicated with each other by a plurality of bypass pipes, and turbulent flow occurs in the combustion gas flowing in the heat transfer pipe to the outer peripheral portion of the small-diameter pipe. setting the fins to generate,
The small-diameter pipe is disposed in the lower part of the heat transfer pipe and welded to the heat transfer pipe, and the fan-shaped fins are fixed to the upper periphery of the small-diameter pipe. The upper part of the small-diameter pipe is The regenerator is characterized in that it communicates with a layer, and the lower part of the small-diameter pipe communicates with the liquid tank through a communication hole formed in the small-diameter pipe and the heat transfer pipe . The refrigerant is evaporated to vaporize the refrigerant by spraying the refrigerant toward the evaporator tube through which the chilled water whose temperature has been increased through cooling is circulated, and the refrigerant vapor generated in the evaporator has a concentration of An absorber that absorbs with a concentrated lithium bromide solution, and a lithium bromide solution that has absorbed a refrigerant to a low concentration is heated by a combustion gas to evaporate the refrigerant in the lithium bromide solution, thereby increasing the lithium bromide solution. In an absorption refrigerator comprising: a regenerator that supplies the absorber as a concentration; and a condenser that condenses the refrigerant vapor generated in the regenerator and supplies the refrigerant to the evaporator, the regenerator includes: Connecting a plurality of heat transfer tubes that horizontally penetrate the liquid tank storing the lithium bromide solution to a furnace tube in which the combustion gas of the combustion burner flows, and connecting a discharge tube for discharging exhaust gas to the outside Configure and before Combustion in which a small-diameter tube whose end is closed is disposed in the heat transfer tube, the liquid tank and the small-diameter tube are communicated with each other by a plurality of bypass tubes, and the outer periphery of the small-diameter tube flows in the heat transfer tube setting the fins so as to create turbulence in the gas,
The small-diameter pipe is disposed in the lower part of the heat transfer pipe and welded to the heat transfer pipe, and the fan-shaped fins are fixed to the upper periphery of the small-diameter pipe. The upper part of the small-diameter pipe is An absorption refrigerating machine characterized in that the lower diameter pipe communicates with the liquid tank through a communication hole formed in the small diameter pipe and the heat transfer pipe .

Images