JP2009103437A - High temperature regenerator for absorption chiller and heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high temperature regenerator for an absorption chiller and heater capable of increasing heat exchanging efficiency and minimizing its volume. <P>SOLUTION: The high temperature regenerator for the absorption chiller and heater includes an outer cylinder connected to a burner, an inner cylinder installed in the outer cylinder and in which a combustion chamber is formed, a liquid chamber for storing a solution between the outer and inner cylinders, a first solution tube installed adjacent to the burner in the combustion chamber for heating the solution therein, and a second solution tube installed at the downstream side of the first solution tube in the combustion chamber. The second solution tube is equipped with a rib projected along a direction perpendicular to the direction of a combustion gas flow generated by the burner. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an absorption chiller / heater, and more particularly to a high-temperature regenerator for an absorption chiller / heater that heats a solution in a solution tube with a burner.

  FIG. 1 is a conceptual diagram of an absorption chiller / heater according to the prior art.

  As shown in FIG. 1, the absorption chiller / heater 1 uses a gas such as LPG or LNG as a heat source and operates a cooling cycle made of an absorbent refrigerant. The absorption chiller / heater 1 uses heat energy primarily, unlike the chiller / heater that uses electricity as an energy source, thus eliminating excessive power load in summer and using waste heat. It has various advantages such as the use of an annexation system.

  Briefly explaining the structure of such an absorption chiller / heater, the evaporation and absorption body 30 constituting the absorption chiller / heater includes an evaporator 31 and an absorber 32 together. Contains the burner 11.

  In a dilute solution pipe 83 extending from the absorber 32 to the high temperature regenerator 10, an absorbing liquid pump 72, a low temperature heat exchanger 40, and a high temperature heat exchanger 50 are sequentially installed. The regeneration and condensation main body 20 includes a low-temperature regenerator 23 and a condenser 21 together.

  The pipe extending from the high temperature regenerator 10 to the low temperature regenerator 23 is a refrigerant vapor pipe 81, and the pipe extending from the condenser 21 to the evaporator 31 is a refrigerant liquid lower pipe 82. The pipe extending to the absorber 32 is a cooling water pipe 86.

  During the operation of the absorption chiller / heater configured as described above, when the fuel gas (LPG, LNG) is burned by the burner 11 of the high-temperature regenerator 10, an aqueous lithium bromide solution flowing from the absorber 32 ( A dilute solution (including a surfactant) is heated and boiled to separate the refrigerant vapor from the dilute solution. The dilute solution is concentrated while being heated in this way, resulting in an intermediate solution having a high concentration. On the other hand, the refrigerant vapor flows through the refrigerant vapor pipe 81 and flows into the low temperature regenerator 23. Then, the intermediate solution that has flowed from the high temperature regenerator 10 into the low temperature regenerator 23 is reheated by the low temperature regenerator 23. In the condenser 21, the refrigerant vapor that has flowed from the low-temperature regenerator 23 is condensed to become a refrigerant liquid, and flows to the evaporator 31.

  In the evaporator 31, the refrigerant liquid is dispersed by the operation of the refrigerant pump 71. Then, the refrigerant vapor evaporated in the evaporator 31 flows into the absorber 32 and is absorbed by the sprayed absorbing liquid. On the other hand, the intermediate solution whose concentration is increased by the separation of the refrigerant vapor in the high temperature regenerator 10 flows to the low temperature regenerator 23 through the intermediate solution pipe 84 and the high temperature heat exchanger 50.

  The intermediate solution is heated by the heater 25 in which the refrigerant vapor flowing from the high temperature regenerator 10 flows. And the density | concentration of an absorption liquid rises further by a refrigerant | coolant vapor | steam being isolate | separated from the said intermediate solution. The concentrated solution heated by the low-temperature regenerator 23 flows into the concentrated solution pipe 85, flows into the absorber 32 through the low-temperature heat exchanger 40, and enters the cooling water pipe 86 by the absorber spraying device 35. It is dripped.

  Then, the concentration of the absorbing liquid decreases by absorbing the refrigerant vapor flowing through the evaporator 31. The absorbent having a reduced concentration is preheated by the low temperature heat exchanger 40 and the high temperature heat exchanger 50 by the driving force of the absorption liquid pump 72 and flows into the high temperature regenerator 10. Reference numeral 13 not illustrated in the drawings is a fuel tank that supplies fuel to the burner, and 15 is a blower that supplies combustion air to the burner.

  The high temperature regenerator 10 in the absorption chiller / heater as described above is provided with a plurality of fins outside the pipe through which the diluted solution flows in order to improve the heat exchange efficiency between the combustion gas and the diluted solution. However, since such fins occupy a considerable area, there is a problem that the volume of the high-temperature regenerator is increased and the heat exchange efficiency is lowered.

  Therefore, the present invention has been made to solve the above-described problems, and its purpose is to increase the efficiency of heat exchange and minimize the volume for an absorption chiller / heater. It is to provide a high temperature regenerator.

  In order to achieve the above object, a high-temperature regenerator for an absorption chiller / heater according to an embodiment of the present invention includes an outer cylinder connected to a burner, an inner cylinder, and a combustion chamber in the outer cylinder. An inner cylinder in which is formed, a liquid chamber for storing a solution between the outer cylinder and the inner cylinder, and a first solution that is installed adjacent to the burner inside the combustion chamber and heats the internal solution And a second solution tube installed on the downstream side of the first solution tube inside the combustion chamber, the second solution tube with respect to the flow direction of the combustion gas by the burner Ribs are provided so as to project along the vertical direction.

  The second solution tube may be a flat tube whose cross section is formed long along the flow direction of the combustion gas, and a plurality of the ribs may be arranged at predetermined intervals.

  Moreover, the said rib should just be a square in the cross section, and the width or height of the said rib should just be 3 mm or more at this time.

  The interval between the ribs may be 43 mm or less.

  The rib spacing may be 25% or less of the width of the straight portion of the second solution tube.

  As described in detail above, the high temperature regenerator for an absorption chiller / heater according to an embodiment of the present invention increases the efficiency of the existing absorption chiller / heater and reduces the volume of the high temperature regenerator. Enables miniaturization.

  Hereinafter, a high temperature regenerator for an absorption chiller / heater according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  2 is a cross-sectional view of a high-temperature regenerator for an absorption chiller / heater according to an embodiment of the present invention, FIG. 3 is a perspective view of the second solution tube shown in FIG. 2, and FIG. FIG. 3 is a cross-sectional view of a second solution tube of a high-temperature regenerator for an absorption chiller / heater according to an embodiment of the present invention.

  Referring to FIG. 2, the high-temperature regenerator 110 of the absorption chiller / heater according to the embodiment of the present invention includes an outer cylinder 150 connected to the burner 120, an inner cylinder 160 installed in the outer cylinder 150, and an outer cylinder 150. A liquid chamber 162 for storing the solution is provided between the cylinder 150 and the inner cylinder 160. A combustion chamber 130 for heating the solution is provided in the inner cylinder 160.

  In the combustion chamber 130, there are a plurality of first solution tubes 170 that are located adjacent to the burner 120 and heat the solution inside by the flame of the burner 120, and downstream of the first solution tube 170. A second solution tube 180 located on the side is arranged. The first solution tube 170 and the second solution tube 180 communicate with the liquid chamber 162.

  The first solution tube 170 is arranged in a plurality of layers at one edge of the combustion chamber 130 of the inner cylinder 160 connected to the burner 120. The first solution tube 170 may have a circular cross section, but is not particularly limited to a circular shape and can be variously modified.

  The second solution tube 180 is arranged in a plurality of layers while being separated from the first solution tube 170 by a predetermined distance. At this time, the cross section of the second solution tube 180 may be in the shape of a flat tube formed long along the combustion gas flow direction of the burner 120. The second solution tubes 180 are arranged in a line along the flow direction of the combustion gas in the burner 120. However, the second solution tubes 180 can also be staggered to increase the contact area.

  The intervals between the first solution tube 170 and the second solution tube 180 are appropriately arranged according to the flow environment of the combustion gas.

  Referring to FIGS. 3 and 4, a predetermined interval is formed on the outer peripheral surface of the second solution pipe 180 along a direction perpendicular to the combustion gas flow direction of the burner 120 (the arrow direction in FIG. 3). A plurality of ribs 182 are projected. The cross section of the rib 182 may be a quadrangle, but is not limited thereto, and may be deformed into various shapes such as a hemispherical shape and a trapezoidal shape.

  When the rib 182 is formed in a quadrangular shape, the height a or the width b is 3 mm or more, and the interval c is 43 mm or less, considering the increase in the combustion efficiency of the high-temperature regenerator, the optimum range It is.

  The interval c between the ribs 182 is preferably 25% or less of the width d of the straight portion of the second solution tube 180.

  Hereinafter, the operation of the high-temperature regenerator for an absorption chiller / heater according to an embodiment of the present invention will be described.

  When fuel gas and air are supplied to and mixed with the combustion chamber 130 of the inner cylinder 160 and combustion is started by ignition of the burner 120, high-temperature combustion gas passes between the adjacent first solution tubes 170. Cooled and the solution in the first solution tube 170 is heated by the combustion gas.

  The combustion gas that has heated the first solution tube 170 heats the solution in the second solution tube 180 as it passes between the straight portions of the plurality of second solution tubes 180. At this time, the distribution of the temperature boundary layer formed on the surface of the second solution tube 180 is changed by the rib 182 formed on the outer peripheral surface of the second solution tube 180. That is, the rib 182 formed on the outer peripheral surface of the second solution pipe 180 lowers the temperature of the rear stage portion of the combustion gas. A decrease in the temperature of the rear stage of the combustion gas means that the heat transfer efficiency between the solution in the second solution tube 180 and the combustion gas is increased.

  As described above, the rib 182 is formed in the direction perpendicular to the flow direction of the combustion gas, that is, in the length direction of the second solution tube 180, so that the combustion by the laminar flow and the turbulent flow occurs during the flow of the combustion gas. The gas outlet temperature can be lowered. Moreover, the heat transfer efficiency between the combustion gas and the solution is increased by lowering the outlet temperature of the combustion gas, and the cooling capacity and COP of the absorption chiller / heater can be improved.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the embodiments, and various modifications can be made within the scope of the claims, the detailed description of the invention, and the attached drawings. The present invention can be modified and implemented, and such a modified implementation naturally falls within the scope of the present invention.

It is a conceptual diagram of the absorption-type cold / hot water machine by a prior art. It is sectional drawing of the high temperature regenerator for absorption type cold / hot water machines by embodiment of this invention. FIG. 3 is a perspective view of a second solution tube shown in FIG. 2. It is sectional drawing of the 2nd solution pipe | tube of the high temperature regenerator for absorption type cold / hot water machines by embodiment of this invention.

Explanation of symbols

120: Burner 130: Combustion chamber 150: Outer cylinder 160: Inner cylinder 162: Liquid chamber 170: First solution tube 180: Second solution tube 182: Rib

Claims (6)

An outer cylinder connected to the burner;
An inner cylinder that is installed inside the outer cylinder and in which a combustion chamber is formed;
A liquid chamber for storing a solution between the outer cylinder and the inner cylinder;
A first solution pipe installed adjacent to the burner inside the combustion chamber for heating the solution inside; and a second solution installed downstream of the first solution pipe inside the combustion chamber. A tube, and
The high-temperature regenerator for an absorption chiller-heater, wherein the second solution pipe includes a rib projecting along a direction perpendicular to the flow direction of the combustion gas by the burner. The second solution tube is a flat tube whose cross section is formed long along the flow direction of the combustion gas,
The high-temperature regenerator for an absorption chiller / heater according to claim 1, wherein the ribs are arranged in a plurality at predetermined intervals.   The high-temperature regenerator for an absorption chiller / heater according to claim 2, wherein the rib has a quadrangular cross section.   The high-temperature regenerator for an absorption chiller / heater according to claim 3, wherein the rib has a width or height of 3 mm or more.   The high-temperature regenerator for an absorption chiller / heater according to claim 2, wherein the interval between the ribs is 43 mm or less.   The high-temperature regenerator for an absorption chiller / heater according to claim 2, wherein a distance between the ribs is 25% or less of a width of the straight portion of the second solution tube.