JPH07318196A - Absorption type refrigerating equipment - Google Patents

Abstract

PURPOSE:To enlarge the amount of heat of a burner in a small-sized generator, to reduce production of a nitrogen oxide even in the case of a high-load operation and to attain a high thermal efficiency by forming a mixing flow passage along which an air-fuel mixture supplied from an air introducing passage circulates through a circular passage formed between an inside casing and a burner housing and enters the inside casing from an inside-outside communication port. CONSTITUTION:An air-fuel mixture to be supplied to a burner 6 is supplied along a mixing flow passage 9 along which the mixture is made to circulate through a circular passage 90 provided between an inside casing 8 and a burner housing 64 and enters the inside casing 8 from the inside-outside communication port 83. Therefore the mixing flow passage 9 can be formed to be long for the burner 6 of a compact structure and the air-fuel mixture can be mixed sufficiently, while the air-fuel mixture can be preheated efficiently. As the result/partial, occurrence of the part of the air-fuel mixture having a small air-fuel ratio and being gas-rich can be prevented and the air-fuel mixture being uniform, having a large air-fuel ratio and being thin can be used. Therefore a combustion temperature can be lowered and production of a nitrogen oxide is reduced, while a thermal efficiency is improved by preheating of the air-fuel mixture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigeration system using an aqueous solution of ammonia, lithium bromide or the like as a working fluid.

[0002]

2. Description of the Related Art An absorption refrigerating apparatus using an aqueous solution (working fluid) of ammonia, lithium bromide, etc., heats the aqueous solution with a generator to generate a vapor of a refrigerant such as ammonia, and the vapor of the refrigerant is condensed. It is liquefied in a vessel and poured into a low-pressure evaporator through an expansion valve to perform a refrigerating action. In the absorber, the refrigerant evaporated again in the evaporator is supplied with the working fluid diluted by the evaporation of the refrigerant as an absorbing liquid from the generator to be absorbed in the absorber. The working fluid having a high concentration due to the absorption of the refrigerant (ammonia gas) is circulated to the generator by a pump.

[0003]

It is desired that the absorption refrigerating apparatus be applied to a home air conditioner / water heater by increasing the load and downsizing of the absorption refrigerating apparatus. Use burner as a source. When the calorific value of the burner is increased to increase the load, there arises a problem that the generation of nitrogen oxides increases. In this case, the method of reducing the generation of nitrogen oxides is effective to keep the combustion temperature of the burner low. For this purpose, it is effective to increase the air-fuel ratio as much as possible and burn it with a lean air-fuel mixture. Is. An object of the present invention is to provide an absorption type refrigerating apparatus which can reduce the generation of nitrogen oxides even when the burner is heated by a small generator to increase the amount of heat generated and the load is operated at high load.

[0004]

In the absorption type refrigerating apparatus of the present invention, the working fluid in the heating container in which the refrigerant and the absorbing fluid are mixed is heated by the burner to generate the mixed working fluid vapor of the refrigerant and the absorbing fluid. In an absorption refrigerating apparatus including a generator, the burner includes a combustion plate, a burner housing having an outer wall provided with an air introduction passage and holding the combustion plate, a fuel gas supply unit to the burner housing, An inner casing having an inner / outer communication port and disposed in the burner housing surrounding the lower surface of the combustion plate; and a short-circuit prevention unit for preventing a short circuit between the inner / outer communication port and the air introduction passage. It is characterized in that a mixing flow passage is formed so as to circulate an annular flow passage between the introduction passage and the inner casing and the burner housing and enter the inner casing from the inner and outer communication ports.

According to the second aspect of the present invention, the short-circuit prevention means is constituted by the partition wall provided between the inner casing and the burner housing. Advantageously, this partition wall is integrally formed during the casting of the inner casing or the burner housing. In the structure according to claim 3, the air introduction passage is provided tangentially to the side wall of the burner housing, and the fuel gas supply means is provided downstream of the nozzle pipe attached in a direction intersecting with the air introduction passage. It was formed by a plurality of gas ejection holes arranged in a row.

[0006]

In this absorption refrigerating apparatus, the air-fuel mixture supplied to the burner goes around the annular flow path provided between the inner casing and the burner housing, and enters the inner casing from the inner / outer communication port. It is supplied through the mixing channel.
For this reason, a compact burner can form a long mixing flow path, the mixture can be sufficiently mixed, and the preheating of the mixture can be efficiently performed. As a result, it is possible to prevent the generation of a gas-rich air-fuel mixture part with a small air-fuel ratio, and it is possible to use a lean air-fuel mixture with a uniform and large air-fuel ratio, so it is possible to reduce the combustion temperature and Generation is reduced and thermal efficiency is improved by preheating the air-fuel mixture.
According to the structure of claim 2, the mixing channel having a long distance can be formed with a simple structure. With the configuration according to claim 3, the fuel gas can be efficiently dispersed in the combustion air.

[0007]

EXAMPLE FIG. 8 and FIG. 9 show a cooling and heating hot water supply apparatus using an absorption type refrigerating apparatus 100 using an aqueous ammonia solution as a working fluid. The absorption refrigeration system 100 of the present invention includes a generator 1 that generates ammonia gas, a heat source side heat exchanger 11 that acts as a demultiplexer during cooling operation, and acts as an evaporator during heating operation, and an evaporator during cooling operation. Acting,
A liquid refrigerant and a gas refrigerant are heat-exchanged between the heat source side heat exchanger 11 including the use side heat exchanger 3 that functions as a demultiplexer during the heating operation and the absorber 4 and the use side heat exchanger 3. An inter-refrigerant heat exchanger 2 is provided. Above the generator 1, a rectifier 12 and a partial condenser (condenser) 13 are sequentially stacked.

These devices are connected by a working liquid flow passage, and a working liquid flow passage that connects the dephlegmator (condenser) 13, the heat source side heat exchanger 11, the inter-refrigerant heat exchanger 2, and the use side heat exchanger 3. A first four-way switching valve 21 and a second four-way switching valve 22 for switching the flow path are provided in the. The inter-refrigerant heat exchanger 2 is a double-tube heat exchanger composed of an inner pipe 2a and an outer pipe 2b. The inner pipe 2a has a liquid refrigerant dedicated flow passage, and the outer pipe 2b has a gas refrigerant dedicated flow. It is a road.

The first four-way switching valve 21 allows the gas refrigerant from the generator 1 to flow into the heat source side heat exchanger 11 during cooling operation, and absorbs the gas refrigerant from the outer pipe 2b of the inter-refrigerant heat exchanger. Inflow to 4. During the heating operation, the gas refrigerant from the generator 1 is switched into the utilization side heat exchanger 3 and the gas refrigerant from the heat source side heat exchanger 11 is caused to flow into the absorber 4 during the heating operation. The second four-way switching valve 22 allows the gas refrigerant from the usage-side heat exchanger 3 to flow into the outer pipe 2b side of the inter-refrigerant heat exchanger during the cooling operation, and the outer pipe 2 of the inter-refrigerant heat exchanger.
The gas refrigerant is caused to flow into the absorber 4 from b. During heating operation, the gas refrigerant from the generator 1 is switched to flow into the utilization side heat exchanger 3 and the outer tube 2b of the inter-refrigerant heat exchanger is switched during the heating operation.
The gas refrigerant from is flowed into the absorber 4.

The generator 1 comprises a heating vessel 5 and a gas burner 6 as shown in FIGS. The heating container 5 heats an aqueous ammonia solution (ammonia dilute solution), which is a dilute solution, to about 200 ° C. at 10 to 20 atmospheres to boil and generate a mixed vapor of ammonia and water. The heating container 5 is provided with a vertical cylindrical body 51 which is opened at the entire upper surface and communicates with a rectifier described later, and a bottom plate 52 welded to the lower portion of the cylindrical body 51.

The bottom plate 52 has a central spherical shell 5 bulging upward.
a, a cylindrical portion 5b extending downward from the outer periphery of the central spherical shell portion 5a, and a collar-shaped portion 5c extending outward from the lower end of the cylindrical portion 5b, the outer periphery of the collar-shaped portion 5c. Is the cylindrical body 51
Is welded to the lower inner wall of the. The center of the bottom plate 52 is formed in a spherical shell shape in order to withstand the high pressure in the heating container with a thin wall thickness. A dilute solution outflow pipe 20 for letting out the ammonia dilute solution and supplying it to the absorber 4 is inserted from the top to the bottom of the heating container 5.

Below the bottom plate 52 is a combustion chamber 60 of the gas burner 6, and at the bottom of the combustion chamber 60 is installed a forced air blowing premixed combustion plate type gas burner 6. The gas burner 6 is, as shown in FIGS. 1 and 4 to 6, a ceramic circular combustion plate 61 having a large number of flame holes formed in a predetermined pattern, and the combustion plate 61 at the lower end of the cylindrical body 51. A combustion plate holding frame 62 for attachment and a burner housing 64 on which the combustion plate holding frame 62 is mounted are provided.

The combustion plate holding frame 62 is provided with a combustion plate fitting cylindrical portion 6A at the center, and the outer periphery thereof is a fastening edge 6B to a flange 57 provided on the lower end surface of the cylindrical body 51. A combustion plate 61 and a perforated plate 63 for achieving a uniform distribution of the air-fuel mixture are fitted into the combustion plate fitting cylindrical portion 6A, and the upper edge of the combustion plate 61 is pressed by an annular rim 6C. Above the combustion plate 61, an ignition electrode S and a misfire detection frame rod F are mounted so as to penetrate the cylindrical body 51.

The combustion plate holding frame 62 is a cylindrical container-shaped burner housing 6 which also serves as a mixing pipe for combustion air and fuel gas.
4 is mounted. The burner housing 64 is provided with a rectangular cylindrical air introduction passage 65 protruding in a tangential direction, and the air introduction passage 65 is intersected with a gas nozzle pipe 67 in which a plurality of gas ejection holes 66 are arranged on the downstream side. It is plugged in. Combustion air is supplied from the blower B to the air introduction passage 65, and fuel gas is supplied from the gas source G to the gas nozzle pipe 67.

In the burner housing 64, a cup-shaped portion 82 which closes the lower surface of the combustion plate 61 and has an upper opening 81 is formed.
And an inner / outer communication port 83 opened on the side wall of the cup-shaped portion 82.
An inner casing 8 having a vertical plate-shaped partition wall 84 protruding outward from an edge of the inner / outer communication port 83 is fitted therein. The partition wall 84 serves as a short-circuit prevention means for preventing a short circuit between the air introduction passage 65 and the inner / outer communication port 83 by contacting one wall edge of the air introduction passage 65 on the inner / outer communication port 83 side.

The burner housing 64 is formed by the partition wall 84.
Inside, an annular flow passage 90 from the air introduction passage 65 to the inner / outer communication port 83 is formed between the outer peripheral wall of the cup-shaped portion 82 and the inner peripheral wall of the burner housing 64. Therefore, in the burner housing 64, the air-fuel mixture supplied from the air introduction passage 65 goes around the annular flow path 90 into the cup-shaped portion 82 from the inner / outer communication port 83 and passes through the perforated plate 63. As a result, the mixing channel 9 reaching the lower surface of the combustion plate 61 is formed.

The mixing flow passage 9 is a longer flow passage due to the annular flow passage 90, and occupies the entire inner volume of the burner housing 64, so that the volume is maximized. Therefore, the premixed gas is sufficiently mixed, and the heat generated by the gas burner 6 is transmitted from the combustion plate 61, the combustion plate holding frame 62, the burner housing 64, and the inner casing 8 to the premixed gas to efficiently preheat the mixture. Burner housing 64
It also cools itself.

Further, the gas nozzle pipe 67 is connected to the air introduction passage 6
5 and a plurality of gas ejection holes 66 are provided in the gas nozzle pipe 67 toward the downstream side of the air introduction passage 65, the fuel gas is efficiently dispersed and injected in the combustion air. , The premixing is sufficient. As a result,
There is no part with a small air-fuel ratio (gas rich), combustion with a lean air-fuel mixture with a uniform air-fuel ratio is possible, nitrogen oxides are reduced, and preheating of the air-fuel mixture improves thermal efficiency. To do. The increase of nitrogen oxides due to the preheating of the air-fuel mixture is almost negligible, and the effect of reducing nitrogen oxides by promoting the mixing of the air-fuel mixture is extremely remarkable.

FIG. 7 shows measured data of air-fuel ratio and generation of nitrogen oxides. (A) shows the case of the gas burner 6 having a short mixing flow path without the annular flow path 90, and (B) shows the case of the gas burner 6 having the mixing flow path of the present invention. From this graph, it is found that the higher the air-fuel ratio, the less the generation of nitrogen oxides in the air-fuel mixture, and the gas burner 6 of the present invention.
It can be seen that since the thermal efficiency is improved, the generation of nitrogen oxides can be reduced even if the combustion is performed in the region where the air-fuel ratio is small. Therefore, the generation of nitrogen oxides can be maintained at a low level under the combustion condition where the excess air ratio is close to 1.0.

In this embodiment, the partition wall 84 as the short-circuit preventing means is formed integrally with the cup-shaped portion 82 by casting. This method is the most economical, but the partition wall 84
May be integrally formed with the burner housing 64, or the partition wall may be formed separately and assembled. Further, the short-circuit prevention means may be a member having a structure other than a wall as long as it can prevent a short circuit between the air introduction passage 65 and the inside / outside communication port 83.

The outer periphery of the cylindrical portion 5b of the bottom plate and the cylindrical body 51
An annular space between the inner periphery of the combustion chamber 60 and the inner periphery of the combustion chamber 60 is filled with hydraulic fluid to form a water jacket 50 surrounding the outer periphery of the combustion chamber 60. This water jacket 5
0 has the effect of reducing the heat radiation loss of the combustion gas by covering the cylindrical body 51 and improving the thermal efficiency.

In the central spherical shell portion 5a of the bottom plate 52, a total of 32 lower holes 53 are formed on the quadruple concentric circles, eight at equal intervals. On the upper side wall of the vertical cylindrical body 51, eight upper holes 54 are formed in four rows vertically, eight at equal intervals. As in this embodiment, by forming eight upper holes 54 at equal intervals in upper and lower four stages, the pipe space can be made compact and the pipe diameter can be increased (heat exchange area can be increased while maintaining proper intervals between pipes). Increase) is possible.

On the outer periphery of the heating container 5, an outer cylinder 7 forming a cylindrical closed space 70 is coaxially provided on the outer periphery of the heating container 5. The outer cylinder 7 includes a cylindrical body 71, an annular upper plate 72 that closes the upper end of the cylindrical body 71, and an annular lower plate 73 that closes the lower end of the cylindrical body 71. A heat insulating material 74 is stretched on the inner peripheral wall of the cylindrical body 71. Cylinder 71
Further, an exhaust hole 75 communicating with a lower end of a combustion gas retention passage 77, which will be described later, provided in the cylindrical closed space 70 is opened at the lower end of the heat insulating material 74, and an exhaust pipe 76 is horizontally provided so as to project. The exhaust port 75 is provided on the annular lower plate 73 so that the exhaust pipe 7
You may project 6 downward.

An annular combustion gas retention passage 77 is formed between the inner peripheral wall of the heat insulating material 74 and the outer peripheral wall of the heating container 5. Corrugated fins 56 as heat absorption fins are provided in the middle of the outer peripheral wall of the heating container 5 in the vertical direction by shifting a half pitch.
It is located in the combustion gas retention passage 77 joined to the step by brazing or the like. In the heating container 5, 32 combustion gas passage tubes 55 bent in an inverted L shape are vertically arranged in parallel. Each combustion gas passage pipe 55 has a lower end welded to the lower hole 53 and an upper end welded to the upper hole 54, and communicates between the combustion chamber 60 and the upper portion of the combustion gas retention passage 77.

In this generator 1, the combustion gas produced by the entire primary combustion of the gas burner 6 flows from the combustion chamber 60 to the upper portion of the combustion gas retention passage 77 through the 32 combustion gas passage pipes 55. The combustion gas that has entered the combustion gas retention passage 77 descends while coming into contact with the corrugated fins 56,
It is discharged from the exhaust hole 75 to the outside through the exhaust pipe 76. In the meantime, the heat generated in the gas burner 6 is transmitted to the internal working fluid via the bottom plate 52 of the heating container, and then the working fluid is heated via the tube wall of the combustion gas passage pipe 55, so that the remaining thermal energy is generated. Is absorbed by the corrugated fins 56 and the cylindrical body 51 and supplied to the hydraulic fluid. Thus the generator 1
Has a very small heat transfer area and a large contact time between the combustion gas and the heat transfer surface, so that the thermal efficiency can be increased up to about 80%. Therefore, a small generator can be operated under high load, and a high refrigerating capacity as a refrigerating device can be obtained.

Next, the operation of the cooling / heating water heater will be described. When the working fluid in the heating container 5 of the generator 1 is heated by the gas burner 6, a mixed vapor of ammonia as a refrigerant and water as an absorbing fluid is generated from the working fluid, and the mixed vapor passes through the rectifier 12. Rise. In this rectifier 12,
Five storage shelves 1A to 1E are formed, and the working liquid (ammonia concentrated solution) supplied from the absorber 4 to the generator 1 flows down from the upper storage portion to the lower storage shelf in sequence.

In the rectifier 12, each time the mixed vapor of ammonia and water rising from below passes through each storage rack, the temperature drop and the contact with the concentrated ammonia solution from above cause the concentration of ammonia in the mixed vapor. Rises. And rectifier 1
The mixed vapor concentrated in 2 is further endothermic by the upper partial condenser 13, and water is condensed and separated to become about 99.8% ammonia gas.

[Cooling Operation] As shown in FIG. 8, this gas refrigerant is supplied to the heat source side heat exchanger 11 acting as a partial condenser through the first four-way switching valve 21 as shown by an arrow L. In the heat source side heat exchanger 11, it is air-cooled by the fan F and releases the heat of condensation to be liquefied and become ammonia liquid (liquid refrigerant). This liquid refrigerant passes through the inner tube 2a of the heat exchanger between refrigerants and is decompressed by the capillary tube 23 which functions as a decompression mechanism, and then to the utilization side heat exchanger (acting as an evaporator) 3 having a double tube structure. Inflow.

The liquid refrigerant exchanges heat with the use side heat medium (in this embodiment, water) supplied from the indoor unit through the use side heat medium passage 31 in the use side heat exchanger 3 by driving the pump P1. Then, it evaporates (water is cooled and becomes a cooling heat source for cooling), and again becomes a gas refrigerant. This gas refrigerant is used in the second four-way switching valve 2
2 is sent to the outer pipe 2b of the inter-refrigerant heat exchanger, where the liquid refrigerant from the heat source side heat exchanger 11 (passes through the inner pipe 2a)
After being pre-cooled and self-heated, the first four-way switching valve 21
And it is sent to the absorber 4 via the second four-way switching valve 22.

This gas refrigerant is again absorbed in the working fluid supplied from the generator 1 to the absorber 4 in the absorber 4. That is, a sprayer 42 for the working fluid is provided at the uppermost step in the absorber container 41 of the absorber 4, and the sprayer 42
On the other hand, as shown by an arrow L1, the working liquid (3% ammonia dilute solution) is supplied from the generator 1 through the capillary tube 24 which is cooled by the heat exchanger 26 in the rectifier and acts as a pressure reducing mechanism.

This dilute ammonia solution is sprayed from the sprayer 42 in the absorber container 41, absorbs the gas refrigerant supplied from the utilization side heat exchanger 3 into the absorber container 41, and reaches the bottom of the absorber container 41. It falls into a certain liquid pool 43. The working liquid (concentrated ammonia solution) in the liquid pool 43 is pumped by the pump P2 as indicated by arrows L2 and L3 in FIG. During this period, heat is exchanged and heated in the heat exchanger 25 of the partial condenser 13 and the heat exchanger 44 in the absorber 4 for absorption heat recovery, and then the uppermost storage shelf 1A in the rectifier 12 is heated. Is supplied to.

[Heating Operation] As shown in FIG. 9, the first four-way switching valve 21 and the second four-way switching valve 22 are switched to switch the flow direction of the gas refrigerant (ammonia gas) flowing through the refrigeration circuit. The gas refrigerant (concentration 99.8%) generated in the dephlegmator 13 passes through the first four-way switching valve 21 and the second four-way switching valve 22 as shown by an arrow L4, and serves as a decompressor. The heat flows into the heat exchanger 3, passes through the use-side heat medium passage 31, exchanges heat with the use-side heat medium (water in this embodiment) supplied from the indoor unit, and condenses. The water is heated by this and becomes a heat source for heating in the indoor unit.

The refrigerant liquefied in the use side heat exchanger 3 is decompressed by the capillary tube 23, and then is supplied to the heat source side heat exchanger 11 acting as an evaporator through the inner tube 2a of the inter-refrigerant heat exchanger. Vaporize, and then the first four-way switching valve 2
1, the outer pipe 2b of the inter-refrigerant heat exchanger, and the second four-way switching valve 22 are supplied to the absorber 4. The generation, rectification, and partial condensation of the water-ammonia mixed vapor in the generator 1 and the absorption of the ammonia gas refrigerant in the absorber are the same as those during the cooling operation shown in FIG. The flow of the concentrated ammonia solution and the diluted ammonia solution is the same as in FIG.

In this embodiment, in addition to the heat exchanger 44 for recovering the absorbed heat, a heat exchanger 45 for a heat source such as hot water supply and a heat exchanger 46 for both cooling and heating are provided in the absorber 4. The heat exchanger 45 for a heat source such as hot water supply is the hot water supply tank 1
4, a bath 15, a bathroom dryer 16 and the like are connected via a pump P3 to form a hot water supply cycle using hot water as a heat medium.

On the inlet side and the outlet side of the cooling / heating combined heat exchanger 46, there are a branch outward path 32 branched from the use side heat medium flow path 31 at the exit of the use side heat exchanger 3 via the three-way switching valve V1. , Branch return path 3 that joins the downstream side of the three-way switching valve V1
3 side is connected respectively. The outlet side of the pump P4 in the cooling water flow path 35 connecting the heat radiating heat exchanger 34 and the pump P4 is connected to the branch outward path 32 via the three-way switching valve V2, while the cooling water flow path 3 is connected.
The inlet side of the heat dissipation heat exchanger 34 in FIG.
3 is connected via a three-way switching valve V3.

The three-way switching valves V2 and V3 are opened on the cooling water flow path 35 side and closed on the branch outward path 32 and branch return path 33 sides during the cooling operation as shown in FIG. As shown in FIG.
It is controlled so that the side is closed and the branch outward path 32 and the branch return path 33 are opened. Therefore, during the cooling operation, the heat medium 46 on the utilization side is not supplied to the heat exchanger 46 in the cooling / heating absorber, but the cooling water is supplied from the heat radiating heat exchanger 34, and the heat is not generated during the heating operation. The utilization side heat medium is supplied to the exchanger 46, and the cooling water from the heat dissipation heat exchanger 34 is not supplied.

[Brief description of drawings]

FIG. 1 is a front sectional view of a generator of an absorption refrigerating apparatus according to the present invention.

FIG. 2 is a perspective view of an upper portion of the heating container.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is an assembly diagram of a gas burner.

FIG. 6 is a perspective view of a burner housing.

FIG. 7 is a graph showing data on the amount of nitrogen oxides generated in a gas burner.

FIG. 8 is a schematic configuration diagram of a cooling / heating apparatus using an absorption refrigeration apparatus.

FIG. 9 is a schematic configuration diagram of a cooling / heating apparatus using an absorption refrigeration apparatus.

[Explanation of symbols]

 1 Generator 2 Refrigerant Heat Exchanger 3 Utilization Side Heat Exchanger 4 Absorber 5 Heating Container 6 Gas Burner 7 Outer Cylinder 8 Inner Casing 9 Mixing Flow Path 11 Heat Source Side Heat Exchanger 12 Fractionator 13 Fractionator 61 Combustion Plate 64 burner housing 65 air introduction passage 66 gas jet 67 gas nozzle tube 75 exhaust hole 77 combustion gas retention passage 83 internal / external communication opening 84 partition wall (short-circuit preventing means) 90 annular flow passage 100 absorption type refrigeration system G gas source

Claims (3)

[Claims] 1. A generator for generating a mixed working fluid vapor of a refrigerant and an absorbing liquid by heating a working fluid in a heating container in which a refrigerant and an absorbing fluid are mixed with a burner; and rectifying the mixed working fluid vapor. A rectifier for concentrating the refrigerant component, a condenser for condensing the gas refrigerant component of the concentrated mixed working fluid vapor, an evaporator for evaporating the liquid refrigerant condensed by the condenser, and an evaporator In an absorption type refrigerating apparatus including an absorber that absorbs evaporated refrigerant vapor in a diluted hydraulic fluid, the burner is a combustion plate, and a burner housing that holds an air introduction passage on an outer wall and holds the combustion plate. A fuel gas supply means to the burner housing, an inner casing surrounding the lower surface of the combustion plate and disposed in the burner housing and having an inner / outer communication port, the inner / outer communication port and the air introduction passage. Short circuit A short-circuit prevention means for stopping, wherein a circular flow path between the air introduction passage and the inner casing and the burner housing is circulated to form a mixing flow passage that enters the inner casing from the inner and outer communication ports. Absorption refrigeration equipment. 2. The absorption type refrigerating apparatus according to claim 1, wherein the short-circuit prevention means is a partition wall provided between the inner casing and the burner housing. 3. The air introduction passage according to claim 1, wherein the air introduction passage is provided tangentially to a side wall of the inner casing, and the fuel gas supply means is provided with a nozzle tube attached in a direction intersecting with the air introduction passage. An absorption refrigeration system comprising a plurality of gas ejection holes arranged in a row on the downstream side of the nozzle tube.